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+	M0 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Forex Trading" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Dispute Resolution" color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+		nest0_1 [label="Fraud Check" color="#FFD54F" fillcolor="#FFF8E1" shape=plaintext style=filled]
+		nest0_2 [label="Financial Advisory" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest0_3 [label="AML Screening" color="#FFD54F" fillcolor="#FFF8E1" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Transaction Audit" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Asset Management" color="#64B5F6" fillcolor="#E3F2FD" shape=oval style=filled]
+		nest1_1 [label="Market Analysis" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+		nest1_2 [label="Approval Decision" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest1_3 [label="Payment Gateway Integration" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S2 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	M1 -> N10 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_10.txt b/test/graphviz/graph_hard/graphviz_10.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3e0cfb9ac18d4306c1fd0a904e076d9fee48f22a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_10.txt
@@ -0,0 +1,40 @@
+<Advisory Committee Meeting, connectedTo, Digital Resource Management>
+<Advisory Committee Meeting, partOf, Advisory Committee Meeting>
+<Club Registration, connectedTo, Library Registration>
+<Club Registration, connectedTo, Timetable Scheduling>
+<Course Material Preparation, connectedTo, Special Education Support>
+<Course Material Preparation, develops, Grade Entry>
+<Curriculum Development, connectedTo, School Accreditation>
+<Digital Resource Management, connectedTo, Club Registration>
+<Digital Resource Management, partOf, Digital Resource Management>
+<Document Verification, connectedTo, Curriculum Development>
+<Document Verification, connectedTo, School Accreditation>
+<Exam Conduct, connectedTo, Alumni Network Management>
+<Extracurricular Activity, connectedTo, Course Material Preparation>
+<Extracurricular Activity, connectedTo, Document Verification>
+<Extracurricular Activity, connectedTo, Faculty Recruitment>
+<Extracurricular Activity, connectedTo, Library Registration>
+<Extracurricular Activity, connectedTo, Online Learning Platform Management>
+<Faculty Recruitment, connectedTo, Online Learning Platform Management>
+<Field Trip Coordination, connectedTo, Course Material Preparation>
+<Field Trip Coordination, connectedTo, Library Registration>
+<Grade Entry, connectedTo, Library Registration>
+<Library Registration, connectedTo, Faculty Recruitment>
+<Online Learning Platform Management, connectedTo, Exam Conduct>
+<Scholarship Evaluation, connectedTo, Student Enrollment>
+<Scholarship Evaluation, monitors, School Accreditation>
+<School Accreditation, connectedTo, Field Trip Coordination>
+<Special Education Support, connectedTo, Study Abroad Program>
+<Special Education Support, partOf, Special Education Support>
+<Student Enrollment, advises, Curriculum Development>
+<Student Enrollment, connectedTo, Club Registration>
+<Student Enrollment, connectedTo, Course Material Preparation>
+<Student Enrollment, connectedTo, Document Verification>
+<Student Enrollment, connectedTo, Exam Conduct>
+<Student Enrollment, connectedTo, Library Registration>
+<Student Enrollment, connectedTo, Timetable Scheduling>
+<Study Abroad Program, connectedTo, Club Registration>
+<Study Abroad Program, partOf, Study Abroad Program>
+<Timetable Scheduling, connectedTo, Advisory Committee Meeting>
+<Timetable Scheduling, connectedTo, Extracurricular Activity>
+<Timetable Scheduling, connectedTo, School Accreditation>
diff --git a/test/graphviz/graph_hard/graphviz_100.txt b/test/graphviz/graph_hard/graphviz_100.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0df181e6fb9c8731c77b381e9f51d3de841b5396
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_100.txt
@@ -0,0 +1,33 @@
+<Applicant Tracking System Management, connectedTo, Candidate Experience Management>
+<Applicant Tracking System Management, connectedTo, Global Recruitment Strategy>
+<Applicant Tracking System Management, connectedTo, Negotiation>
+<Background Check, connectedTo, Executive Search>
+<Background Check, partOf, Background Check>
+<Campus Recruitment, connectedTo, Contingent Workforce Management>
+<Campus Recruitment, connectedTo, Diversity Sourcing>
+<Campus Recruitment, connectedTo, Freelancer Engagement>
+<Campus Recruitment, connectedTo, Global Recruitment Strategy>
+<Campus Recruitment, connectedTo, Negotiation>
+<Campus Recruitment, develops, Global Recruitment Strategy>
+<Campus Recruitment, headhunts, Global Recruitment Strategy>
+<Candidate Experience Management, connectedTo, Campus Recruitment>
+<Candidate Experience Management, connectedTo, Global Recruitment Strategy>
+<Candidate Experience Management, connectedTo, Negotiation>
+<Candidate Experience Management, connectedTo, Talent Pipeline Building>
+<Candidate Tracking, connectedTo, Interview Panel Coordination>
+<Candidate Tracking, partOf, Candidate Tracking>
+<Contingent Workforce Management, connectedTo, Candidate Tracking>
+<Contingent Workforce Management, partOf, Contingent Workforce Management>
+<Diversity Sourcing, connectedTo, Freelancer Engagement>
+<Diversity Sourcing, connectedTo, Global Recruitment Strategy>
+<Diversity Sourcing, connectedTo, Negotiation>
+<Executive Search, connectedTo, Negotiation>
+<Executive Search, partOf, Executive Search>
+<Freelancer Engagement, connectedTo, Negotiation>
+<Interview Panel Coordination, connectedTo, Negotiation>
+<Interview Panel Coordination, partOf, Interview Panel Coordination>
+<Negotiation, connectedTo, Global Recruitment Strategy>
+<Recruitment Process Outsourcing Management, connectedTo, Background Check>
+<Recruitment Process Outsourcing Management, partOf, Recruitment Process Outsourcing Management>
+<Talent Pipeline Building, connectedTo, Recruitment Process Outsourcing Management>
+<Talent Pipeline Building, partOf, Talent Pipeline Building>
diff --git a/test/graphviz/graph_hard/graphviz_102.dot b/test/graphviz/graph_hard/graphviz_102.dot
new file mode 100644
index 0000000000000000000000000000000000000000..665d885caf976cece5044ae1ce6100558a011b0f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_102.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=BT
+	N0 [label="AI in Recruitment" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Job Fair Organization" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N2 [label="Temporary Staffing" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N3 [label="Onboarding Handoff" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N4 [label="Contingent Workforce Management" color="#7E57C2" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+	N5 [label="Recruitment Analytics" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N6 [label="Offer Extension" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N7 [label="Global Recruitment Strategy" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+	N8 [label="Job Description Creation" color="#8C9EFF" fillcolor="#D3D7EB" shape=Mdiamond style=filled]
+	N9 [label="Applicant Tracking System Management" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S0 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label=Negotiation labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Reference Checking" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest0_1 [label="Psychometric Testing" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest0_2 [label="Recruitment Metrics Reporting" color="#8C9EFF" fillcolor="#D3D7EB" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Recruitment Marketing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Compliance in Hiring" color="#8C9EFF" fillcolor="#D3D7EB" shape=octagon style=filled]
+		nest1_1 [label="Recruitment Process Outsourcing Management" color="#8C9EFF" fillcolor="#D3D7EB" shape=parallelogram style=filled]
+		nest1_2 [label="Diversity Sourcing" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=consults color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=advertises color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N4 -> S2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_102.txt b/test/graphviz/graph_hard/graphviz_102.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e5d7f9db280c92f3602def875a41b0b1c8ec6e76
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_102.txt
@@ -0,0 +1,35 @@
+<AI in Recruitment, connectedTo, Contingent Workforce Management>
+<AI in Recruitment, connectedTo, Global Recruitment Strategy>
+<AI in Recruitment, connectedTo, Job Description Creation>
+<AI in Recruitment, connectedTo, Onboarding Handoff>
+<AI in Recruitment, connectedTo, Temporary Staffing>
+<AI in Recruitment, consults, Job Fair Organization>
+<Compliance in Hiring, connectedTo, Recruitment Process Outsourcing Management>
+<Compliance in Hiring, partOf, Compliance in Hiring>
+<Contingent Workforce Management, connectedTo, Global Recruitment Strategy>
+<Contingent Workforce Management, connectedTo, Job Description Creation>
+<Contingent Workforce Management, connectedTo, Offer Extension>
+<Contingent Workforce Management, connectedTo, Recruitment Analytics>
+<Diversity Sourcing, connectedTo, Contingent Workforce Management>
+<Diversity Sourcing, partOf, Diversity Sourcing>
+<Global Recruitment Strategy, advertises, Job Description Creation>
+<Job Description Creation, connectedTo, Applicant Tracking System Management>
+<Job Fair Organization, connectedTo, Global Recruitment Strategy>
+<Job Fair Organization, connectedTo, Onboarding Handoff>
+<Job Fair Organization, connectedTo, Temporary Staffing>
+<Offer Extension, connectedTo, Global Recruitment Strategy>
+<Offer Extension, connectedTo, Reference Checking>
+<Onboarding Handoff, connectedTo, Contingent Workforce Management>
+<Psychometric Testing, connectedTo, Recruitment Metrics Reporting>
+<Psychometric Testing, partOf, Psychometric Testing>
+<Recruitment Analytics, connectedTo, Global Recruitment Strategy>
+<Recruitment Analytics, connectedTo, Offer Extension>
+<Recruitment Metrics Reporting, connectedTo, Temporary Staffing>
+<Recruitment Metrics Reporting, partOf, Recruitment Metrics Reporting>
+<Recruitment Process Outsourcing Management, connectedTo, Diversity Sourcing>
+<Recruitment Process Outsourcing Management, partOf, Recruitment Process Outsourcing Management>
+<Reference Checking, connectedTo, Psychometric Testing>
+<Reference Checking, partOf, Reference Checking>
+<Temporary Staffing, connectedTo, Compliance in Hiring>
+<Temporary Staffing, connectedTo, Global Recruitment Strategy>
+<Temporary Staffing, connectedTo, Onboarding Handoff>
diff --git a/test/graphviz/graph_hard/graphviz_103.txt b/test/graphviz/graph_hard/graphviz_103.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e52e04b4362a31038ce4921baad4dcc2c73ab71d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_103.txt
@@ -0,0 +1,37 @@
+<Accessibility Support, connectedTo, Email Support>
+<Complaint Resolution, connectedTo, Customer Onboarding Support>
+<Complaint Resolution, partOf, Complaint Resolution>
+<Cross_selling Opportunities, connectedTo, FAQ Management>
+<Customer Journey Mapping, connectedTo, Cross_selling Opportunities>
+<Customer Loyalty Program Support, connectedTo, Live Chat Support>
+<Customer Loyalty Program Support, connectedTo, Up_selling Opportunities>
+<Customer Onboarding Support, connectedTo, Product Information Provision>
+<Customer Onboarding Support, partOf, Customer Onboarding Support>
+<Customer Retention Strategies, connectedTo, FAQ Management>
+<Customer Retention Strategies, partOf, Customer Retention Strategies>
+<FAQ Management, connectedTo, Feedback Loop to Product Development>
+<Feedback Collection, connectedTo, Customer Retention Strategies>
+<Feedback Collection, partOf, Feedback Collection>
+<Feedback Loop to Product Development, connectedTo, Accessibility Support>
+<Feedback Loop to Product Development, connectedTo, Up_selling Opportunities>
+<Issue Escalation, connectedTo, Customer Journey Mapping>
+<Issue Escalation, connectedTo, Email Support>
+<Issue Escalation, connectedTo, Up_selling Opportunities>
+<Live Chat Support, connectedTo, Sentiment Analysis>
+<Multilingual Support, connectedTo, Accessibility Support>
+<Multilingual Support, connectedTo, Cross_selling Opportunities>
+<Multilingual Support, connectedTo, Order Status Check>
+<Multilingual Support, connectedTo, Technical Support>
+<Order Status Check, connectedTo, Feedback Collection>
+<Order Status Check, connectedTo, Personalized Assistance>
+<Order Status Check, connectedTo, Up_selling Opportunities>
+<Personalized Assistance, connectedTo, Issue Escalation>
+<Product Information Provision, connectedTo, Email Support>
+<Product Information Provision, partOf, Product Information Provision>
+<Sentiment Analysis, connectedTo, Accessibility Support>
+<Sentiment Analysis, connectedTo, Cross_selling Opportunities>
+<Sentiment Analysis, connectedTo, Multilingual Support>
+<Sentiment Analysis, connectedTo, Personalized Assistance>
+<Technical Support, connectedTo, Complaint Resolution>
+<Technical Support, partOf, Technical Support>
+<Up_selling Opportunities, connectedTo, Accessibility Support>
diff --git a/test/graphviz/graph_hard/graphviz_104.dot b/test/graphviz/graph_hard/graphviz_104.dot
new file mode 100644
index 0000000000000000000000000000000000000000..401c96c2cd26a0bbfe94408ec9108a8524a77947
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_104.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=BT
+	N0 [label="Training Customer Service Agents" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N1 [label="Cross_selling Opportunities" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N2 [label="Complaint Trend Analysis" color="#D3EB9F" fillcolor="#F8FDD3" shape=parallelogram style=filled]
+	N3 [label="Complaint Resolution" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N4 [label="Service Level Agreement Monitoring" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N5 [label="Feedback Collection" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N6 [label="Live Chat Support" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N7 [label="Sentiment Analysis" color="#D3EB9F" fillcolor="#F8FDD3" shape=parallelogram style=filled]
+	N8 [label="Customer Relationship Management System Use" color="#FFA726" fillcolor="#FFF3E0" shape=folder style=filled]
+	N9 [label="Up_selling Opportunities" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N10 [label="Self_Service Portal Management" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N11 [label="Post_Service Follow_up" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N12 [label="Product Information Provision" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N13 [label="Customer Success Management" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N14 [label="Customer Loyalty Program Support" color="#61CAC3" fillcolor="#C2E8E6" shape=octagon style=filled]
+	N15 [label="Inquiry Handling" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N16 [label="Account Management" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N17 [label="Accessibility Support" color="#D3EB9F" fillcolor="#F8FDD3" shape=plaintext style=filled]
+	N18 [label="Feedback Loop to Product Development" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N19 [label="Service Recovery" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Proactive Communication" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Personalized Assistance" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest0_1 [label="Technical Support" color="#61CAC3" fillcolor="#C2E8E6" shape=oval style=filled]
+		nest0_2 [label="Customer Retention Strategies" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Knowledge Base Creation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Customer Journey Mapping" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+		nest1_1 [label="Customer Onboarding Support" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N18 -> N19 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest1_0 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N9 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N13 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N17 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N18 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N19 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	M0 -> N12 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N13 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N15 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_105.dot b/test/graphviz/graph_hard/graphviz_105.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9e8c11ba120aedba6902e4a9bca3000a9c317c8a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_105.dot
@@ -0,0 +1,85 @@
+digraph {
+	rankdir=LR
+	N0 [label="Cross_selling Opportunities" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Post_Service Follow_up" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	N2 [label="Service Blueprinting" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N3 [label="Technical Support" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N4 [label="Proactive Communication" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N5 [label="Customer Onboarding Support" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N6 [label="Customer Success Management" color="#FF9800" fillcolor="#FFE0B2" shape=folder style=filled]
+	N7 [label="Customer Retention Strategies" color="#FF9800" fillcolor="#FFE0B2" shape=folder style=filled]
+	N8 [label="Feedback Loop to Product Development" color="#FF9800" fillcolor="#FFE0B2" shape=octagon style=filled]
+	N9 [label="Customer Journey Mapping" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	N10 [label="Call Center Management" color="#7E57C2" fillcolor="#D1C4E9" shape=octagon style=filled]
+	N11 [label="First Contact Resolution Optimization" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N12 [label="Email Support" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N13 [label="Issue Escalation" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N14 [label="Product Information Provision" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N15 [label="Customer Loyalty Program Support" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N16 [label="Live Chat Support" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N17 [label="Training Customer Service Agents" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	S0 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Inquiry Handling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Refund Processing" color="#7E57C2" fillcolor="#D1C4E9" shape=folder style=filled]
+		nest0_1 [label="Complaint Trend Analysis" color="#2196F3" fillcolor="#BBDEFB" shape=parallelogram style=filled]
+		nest0_2 [label="Customer Satisfaction Survey" color="#2196F3" fillcolor="#BBDEFB" shape=parallelogram style=filled]
+		nest0_3 [label="Feedback Collection" color="#7E57C2" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Knowledge Base Creation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="FAQ Management" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+		nest1_1 [label="Order Status Check" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> nest0_0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N14 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N13 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N10 -> S1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [label=monitors color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S2 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	S2 -> N16 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	M0 -> N16 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label=resolves color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	M1 -> N12 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N10 -> M2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N13 -> M2 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	M2 -> N15 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_106.dot b/test/graphviz/graph_hard/graphviz_106.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d77a3cc4ede74659845bacafc41fe44dd6edbef7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_106.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=BT
+	N0 [label="Predictive Analytics" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N1 [label="Inventory Management" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	N2 [label="Cold Chain Logistics" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N3 [label="Circular Economy Practices" color="#FFE69C" fillcolor="#FFF9D4" shape=octagon style=filled]
+	N4 [label="Logistics Optimization" color="#FFE69C" fillcolor="#FFF9D4" shape=parallelogram style=filled]
+	N5 [label="Order Fulfillment" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+	N6 [label="Risk Mitigation Strategies" color="#FFE69C" fillcolor="#FFF9D4" shape=plaintext style=filled]
+	N7 [label="Supplier Relationship Management" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N8 [label="Supplier Selection" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+	N9 [label="Hazardous Materials Handling" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N10 [label=Procurement color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N11 [label="Demand Planning" color="#00BCD4" fillcolor="#B2EBF2" shape=oval style=filled]
+	N12 [label="Supply Chain Visibility" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N13 [label="Third_Party Logistics Management" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N14 [label="Sustainability Initiatives" color="#00BCD4" fillcolor="#B2EBF2" shape=diamond style=filled]
+	N15 [label="Quality Control in Supply Chain" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+	N16 [label="Customs Compliance" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N17 [label="Performance Monitoring" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	S0 [label="" color="#4FC3F7" fillcolor="#E1F5FE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4FC3F7" fillcolor="#E1F5FE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Data Analytics for Supply Chain" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Global Sourcing Strategy" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest0_1 [label="Freight Auditing" color="#00BCD4" fillcolor="#B2EBF2" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label=Warehousing labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Collaborative Planning" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest1_1 [label="Warehouse Automation" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=returns color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=negotiates color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=optimizes color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N5 [label=simulates color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N13 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N1 [label=transports color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N14 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N16 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N15 -> M1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	M1 -> N17 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_107.txt b/test/graphviz/graph_hard/graphviz_107.txt
new file mode 100644
index 0000000000000000000000000000000000000000..909d75f9ede2c0f7fd9d5f3dda114f19a40fc3e2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_107.txt
@@ -0,0 +1,34 @@
+<Cold Chain Logistics, connectedTo, Reverse Logistics>
+<Collaborative Planning, connectedTo, Production Scheduling Integration>
+<Container Tracking, researches, Cold Chain Logistics>
+<Customs Compliance, connectedTo, Performance Monitoring>
+<Data Analytics for Supply Chain, connectedTo, Performance Monitoring>
+<Data Analytics for Supply Chain, partOf, Data Analytics for Supply Chain>
+<Distribution Network Design, connectedTo, Customs Compliance>
+<Hazardous Materials Handling, connectedTo, Risk Management>
+<Hazardous Materials Handling, partOf, Hazardous Materials Handling>
+<Inventory Management, connectedTo, Material Flow Management>
+<Inventory Management, partOf, Inventory Management>
+<Logistics Optimization, connectedTo, Third_Party Logistics Management>
+<Material Flow Management, connectedTo, Data Analytics for Supply Chain>
+<Material Flow Management, partOf, Material Flow Management>
+<Performance Monitoring, connectedTo, Inventory Management>
+<Performance Monitoring, connectedTo, Last_Mile Delivery Optimization>
+<Predictive Analytics, communicates, Last_Mile Delivery Optimization>
+<Predictive Analytics, connectedTo, Supply Chain Visibility>
+<Predictive Analytics, monitors, Performance Monitoring>
+<Production Scheduling Integration, connectedTo, Distribution Network Design>
+<Production Scheduling Integration, inspects, Hazardous Materials Handling>
+<Reverse Logistics, connectedTo, Collaborative Planning>
+<Reverse Logistics, connectedTo, Customs Compliance>
+<Reverse Logistics, connectedTo, Last_Mile Delivery Optimization>
+<Reverse Logistics, connectedTo, Predictive Analytics>
+<Risk Management, connectedTo, Cold Chain Logistics>
+<Risk Management, partOf, Risk Management>
+<Supplier Selection, connectedTo, Last_Mile Delivery Optimization>
+<Supplier Selection, connectedTo, Logistics Optimization>
+<Supply Chain Visibility, connectedTo, Collaborative Planning>
+<Supply Chain Visibility, connectedTo, Last_Mile Delivery Optimization>
+<Third_Party Logistics Management, connectedTo, Customs Compliance>
+<Third_Party Logistics Management, connectedTo, Warehouse Automation>
+<Warehouse Automation, connectedTo, Container Tracking>
diff --git a/test/graphviz/graph_hard/graphviz_108.txt b/test/graphviz/graph_hard/graphviz_108.txt
new file mode 100644
index 0000000000000000000000000000000000000000..85e1b356fdd9716759c6a1a97da2ab5e8b2edf5b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_108.txt
@@ -0,0 +1,37 @@
+<Circular Economy Practices, connectedTo, Customs Compliance>
+<Circular Economy Practices, connectedTo, Material Flow Management>
+<Circular Economy Practices, connectedTo, Reverse Logistics>
+<Collaborative Planning, connectedTo, Global Sourcing Strategy>
+<Collaborative Planning, connectedTo, Reverse Logistics>
+<Customs Compliance, connectedTo, Reverse Logistics>
+<Demand Planning, connectedTo, Predictive Analytics>
+<Global Sourcing Strategy, connectedTo, Performance Monitoring>
+<Global Sourcing Strategy, connectedTo, Reverse Logistics>
+<Last_Mile Delivery Optimization, connectedTo, Reverse Logistics>
+<Last_Mile Delivery Optimization, partOf, Last_Mile Delivery Optimization>
+<Material Flow Management, connectedTo, Production Planning>
+<Material Flow Management, partOf, Material Flow Management>
+<Performance Monitoring, connectedTo, Customs Compliance>
+<Performance Monitoring, connectedTo, Reverse Logistics>
+<Performance Monitoring, connectedTo, Sustainability Initiatives>
+<Predictive Analytics, connectedTo, Circular Economy Practices>
+<Predictive Analytics, connectedTo, Customs Compliance>
+<Predictive Analytics, connectedTo, Reverse Logistics>
+<Predictive Analytics, connectedTo, Risk Mitigation Strategies>
+<Predictive Analytics, connectedTo, Warehouse Automation>
+<Production Planning, connectedTo, Performance Monitoring>
+<Production Planning, partOf, Production Planning>
+<Reverse Logistics, connectedTo, Distribution Network Design>
+<Risk Mitigation Strategies, connectedTo, Last_Mile Delivery Optimization>
+<Risk Mitigation Strategies, partOf, Risk Mitigation Strategies>
+<Supplier Relationship Management, connectedTo, Collaborative Planning>
+<Supplier Relationship Management, connectedTo, Global Sourcing Strategy>
+<Sustainability Initiatives, connectedTo, Circular Economy Practices>
+<Sustainability Initiatives, connectedTo, Customs Compliance>
+<Sustainability Initiatives, connectedTo, Demand Planning>
+<Sustainability Initiatives, connectedTo, Distribution Network Design>
+<Sustainability Initiatives, connectedTo, Warehouse Automation>
+<Transportation Management, connectedTo, Global Sourcing Strategy>
+<Transportation Management, connectedTo, Supplier Relationship Management>
+<Warehouse Automation, connectedTo, Warehousing>
+<Warehousing, connectedTo, Circular Economy Practices>
diff --git a/test/graphviz/graph_hard/graphviz_109.dot b/test/graphviz/graph_hard/graphviz_109.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3d079af87a33ee414cf36ab0c543897c7dd958e9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_109.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=RL
+	N0 [label="Ventilation System" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Exploration Drilling" color="#81C784" fillcolor="#F1F8E9" shape=Mdiamond style=filled]
+	N2 [label="Regulatory Compliance Reporting" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N3 [label="Waste Rock Management" color="#7986CB" fillcolor="#E8EAF6" shape=plaintext style=filled]
+	N4 [label=Haulage color="#00BCD4" fillcolor="#E0F7FA" shape=folder style=filled]
+	N5 [label="Product Marketing" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N6 [label="Environmental Impact Assessment" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N7 [label="Resource Estimation" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N8 [label="Robotics in Mining" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N9 [label="Drilling and Blasting" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N10 [label="Asset Management" color="#81C784" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N11 [label=Exploration color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N12 [label="Energy Management" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	S0 [label="" color="#81C784" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#81C784" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Noise Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Dust Control" color="#81C784" fillcolor="#F1F8E9" shape=Mdiamond style=filled]
+		nest0_1 [label="Mine Dewatering" color="#00BCD4" fillcolor="#E0F7FA" shape=diamond style=filled]
+		nest0_2 [label="Mineral Processing" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+		nest0_3 [label="Mine Planning" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Mine Closure Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Permit Acquisition" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest1_1 [label="Core Logging" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=sells color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N5 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest1_0 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_11.txt b/test/graphviz/graph_hard/graphviz_11.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a7e88d981062d7ab86f25986fcc3e13a57796a8b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_11.txt
@@ -0,0 +1,35 @@
+<Academic Review, connectedTo, Counseling Session>
+<Academic Review, connectedTo, Study Abroad Program>
+<Advisory Committee Meeting, connectedTo, Orientation>
+<Advisory Committee Meeting, partOf, Advisory Committee Meeting>
+<Assignment Submission, connectedTo, Transcript Issuance>
+<Attendance Tracking, assesses, Field Trip Coordination>
+<Attendance Tracking, connectedTo, Internship Coordination>
+<Counseling Session, connectedTo, Research Grant Application>
+<Counseling Session, connectedTo, Student Application>
+<Course Selection, connectedTo, Counseling Session>
+<Digital Resource Management, connectedTo, Disciplinary Action>
+<Digital Resource Management, connectedTo, Student Application>
+<Digital Resource Management, connectedTo, Transcript Issuance>
+<Disciplinary Action, connectedTo, Lecture Delivery>
+<Disciplinary Action, connectedTo, School Accreditation>
+<Document Verification, connectedTo, Academic Review>
+<Document Verification, partOf, Document Verification>
+<Field Trip Coordination, connectedTo, Internship Coordination>
+<Graduation Approval, connectedTo, Peer Tutoring>
+<Internship Coordination, connectedTo, Counseling Session>
+<Internship Coordination, connectedTo, Digital Resource Management>
+<Lecture Delivery, publishes, Academic Review>
+<Online Learning Platform Management, advises, Internship Coordination>
+<Online Learning Platform Management, connectedTo, Attendance Tracking>
+<Orientation, connectedTo, Study Abroad Program>
+<Orientation, partOf, Orientation>
+<Peer Tutoring, connectedTo, Assignment Submission>
+<Research Grant Application, evaluates, Advisory Committee Meeting>
+<Research Grant Application, partOf, Research Grant Application>
+<School Accreditation, connectedTo, Document Verification>
+<School Accreditation, partOf, School Accreditation>
+<Study Abroad Program, connectedTo, Graduation Approval>
+<Transcript Issuance, connectedTo, Counseling Session>
+<Transcript Issuance, connectedTo, Course Selection>
+<Transcript Issuance, connectedTo, Student Application>
diff --git a/test/graphviz/graph_hard/graphviz_110.dot b/test/graphviz/graph_hard/graphviz_110.dot
new file mode 100644
index 0000000000000000000000000000000000000000..368290e9f9a37b36d51a63399417a5678a8e9476
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_110.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=LR
+	N0 [label="Core Logging" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N1 [label="Ventilation System" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N2 [label="Asset Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+	N3 [label=Refining color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N4 [label="Robotics in Mining" color="#9575CD" fillcolor="#EDE7F6" shape=Mdiamond style=filled]
+	N5 [label="Permit Acquisition" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N6 [label="Crushing and Grinding" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N7 [label=Smelting color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N8 [label="Product Marketing" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N9 [label="Geological Survey" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label=Haulage labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Resource Estimation" color="#9575CD" fillcolor="#EDE7F6" shape=octagon style=filled]
+		nest0_1 [label="Waste Rock Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest0_2 [label="Open Pit Mining Operations" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Mineral Processing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Safety Management" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest1_1 [label="Mine Planning" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest1_2 [label="Underground Mining Operations" color="#FFF8A6" fillcolor="#FFFDE0" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=crushes color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [label=drills color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N7 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_110.txt b/test/graphviz/graph_hard/graphviz_110.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1d258a5679d62ff5cf031395577186160d191bdb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_110.txt
@@ -0,0 +1,33 @@
+<Asset Management, connectedTo, Geological Survey>
+<Asset Management, connectedTo, Permit Acquisition>
+<Asset Management, connectedTo, Product Marketing>
+<Asset Management, connectedTo, Refining>
+<Asset Management, connectedTo, Robotics in Mining>
+<Core Logging, connectedTo, Ventilation System>
+<Crushing and Grinding, connectedTo, Smelting>
+<Mine Planning, connectedTo, Underground Mining Operations>
+<Mine Planning, partOf, Mine Planning>
+<Open Pit Mining Operations, connectedTo, Smelting>
+<Open Pit Mining Operations, partOf, Open Pit Mining Operations>
+<Permit Acquisition, connectedTo, Crushing and Grinding>
+<Permit Acquisition, connectedTo, Geological Survey>
+<Permit Acquisition, connectedTo, Product Marketing>
+<Permit Acquisition, connectedTo, Smelting>
+<Product Marketing, connectedTo, Geological Survey>
+<Refining, connectedTo, Crushing and Grinding>
+<Refining, connectedTo, Geological Survey>
+<Refining, connectedTo, Safety Management>
+<Refining, crushes, Robotics in Mining>
+<Resource Estimation, connectedTo, Waste Rock Management>
+<Resource Estimation, partOf, Resource Estimation>
+<Robotics in Mining, connectedTo, Permit Acquisition>
+<Safety Management, connectedTo, Mine Planning>
+<Safety Management, partOf, Safety Management>
+<Smelting, connectedTo, Product Marketing>
+<Underground Mining Operations, connectedTo, Asset Management>
+<Underground Mining Operations, partOf, Underground Mining Operations>
+<Ventilation System, connectedTo, Asset Management>
+<Ventilation System, connectedTo, Crushing and Grinding>
+<Ventilation System, drills, Resource Estimation>
+<Waste Rock Management, connectedTo, Open Pit Mining Operations>
+<Waste Rock Management, partOf, Waste Rock Management>
diff --git a/test/graphviz/graph_hard/graphviz_111.dot b/test/graphviz/graph_hard/graphviz_111.dot
new file mode 100644
index 0000000000000000000000000000000000000000..eed9e5217ea269b5b20b791779c7643aa1c21459
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_111.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=RL
+	N0 [label="Feasibility Study" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N1 [label="Mine Planning" color="#D3EB9F" fillcolor="#F8FDD3" shape=Mdiamond style=filled]
+	N2 [label="Waste Rock Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N3 [label="Equipment Maintenance" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N4 [label="Core Logging" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N5 [label=Haulage color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N6 [label="Exploration Drilling" color="#4285F4" fillcolor="#D0E0F8" shape=folder style=filled]
+	N7 [label="Emergency Response Planning" color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+	N8 [label="Geotechnical Stability Analysis" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N9 [label="Ventilation System" color="#F7BEE0" fillcolor="#FAEBF3" shape=Mdiamond style=filled]
+	N10 [label=Reclamation color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N11 [label="Noise Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N12 [label=Smelting color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	S0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Permit Acquisition" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Mineral Processing" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+		nest0_1 [label="Geological Survey" color="#F7BEE0" fillcolor="#FAEBF3" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Remote Operations Center" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Water Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=Mdiamond style=filled]
+		nest1_1 [label="Dust Control" color="#F7BEE0" fillcolor="#FAEBF3" shape=diamond style=filled]
+		nest1_2 [label="Resource Estimation" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=optimizes color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=markets color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=explores color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N6 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N1 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [label=monitors color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [label=designs color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S2 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [label=secures color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_112.dot b/test/graphviz/graph_hard/graphviz_112.dot
new file mode 100644
index 0000000000000000000000000000000000000000..851115c7712a5e6c02b8dc927f7f32440aee79a3
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_112.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=TD
+	N0 [label="Voyage Optimization" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N1 [label="Green Shipping Initiatives" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N2 [label="Fleet Management" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N3 [label=Shipbuilding color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N4 [label="Salvage Operations" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N5 [label="Freight Forwarding" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N6 [label="Ship Design" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N7 [label="Ballast Water Management" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N8 [label="Fuel Consumption Optimization" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N9 [label="Port Operations" color="#8C9EFF" fillcolor="#D3D7EB" shape=folder style=filled]
+	N10 [label="Vessel Chartering" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N11 [label="Autonomous Vessels" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N12 [label=Navigation color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N13 [label="Route Planning" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N14 [label="Hydrographic Surveying" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+	N15 [label="Marine Research" color="#CDDC39" fillcolor="#E6EE9C" shape=folder style=filled]
+	N16 [label="Inland Waterway Transport" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	S0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Marine Data Analytics" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Search and Rescue Coordination" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest0_1 [label=Bunkering color="#FFC2C2" fillcolor="#FFEBEB" shape=octagon style=filled]
+		nest0_2 [label="Port Congestion Management" color="#FFC2C2" fillcolor="#FFEBEB" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Customs Clearance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Offshore Operations" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+		nest1_1 [label="Marine Insurance" color="#CDDC39" fillcolor="#E6EE9C" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=salvages color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=alerts color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [label=repairs color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N10 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest1_0 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S0 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [label=transports color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N14 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N15 -> N7 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_112.txt b/test/graphviz/graph_hard/graphviz_112.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d023ac32b066d74eed6e9debb2d256284cfc2d9d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_112.txt
@@ -0,0 +1,34 @@
+<Autonomous Vessels, connectedTo, Navigation>
+<Ballast Water Management, connectedTo, Fuel Consumption Optimization>
+<Ballast Water Management, connectedTo, Hydrographic Surveying>
+<Bunkering, connectedTo, Port Congestion Management>
+<Bunkering, partOf, Bunkering>
+<Fleet Management, connectedTo, Hydrographic Surveying>
+<Fleet Management, connectedTo, Shipbuilding>
+<Freight Forwarding, alerts, Ship Design>
+<Freight Forwarding, connectedTo, Search and Rescue Coordination>
+<Fuel Consumption Optimization, connectedTo, Port Operations>
+<Fuel Consumption Optimization, connectedTo, Search and Rescue Coordination>
+<Green Shipping Initiatives, connectedTo, Fleet Management>
+<Hydrographic Surveying, connectedTo, Marine Research>
+<Marine Insurance, connectedTo, Green Shipping Initiatives>
+<Marine Insurance, partOf, Marine Insurance>
+<Marine Research, connectedTo, Ballast Water Management>
+<Marine Research, connectedTo, Inland Waterway Transport>
+<Navigation, connectedTo, Route Planning>
+<Offshore Operations, connectedTo, Marine Insurance>
+<Offshore Operations, partOf, Offshore Operations>
+<Port Congestion Management, connectedTo, Vessel Chartering>
+<Port Congestion Management, partOf, Port Congestion Management>
+<Port Operations, connectedTo, Offshore Operations>
+<Port Operations, connectedTo, Vessel Chartering>
+<Route Planning, connectedTo, Marine Research>
+<Route Planning, repairs, Hydrographic Surveying>
+<Route Planning, transports, Inland Waterway Transport>
+<Salvage Operations, connectedTo, Freight Forwarding>
+<Search and Rescue Coordination, connectedTo, Bunkering>
+<Search and Rescue Coordination, partOf, Search and Rescue Coordination>
+<Ship Design, connectedTo, Ballast Water Management>
+<Shipbuilding, connectedTo, Salvage Operations>
+<Vessel Chartering, connectedTo, Autonomous Vessels>
+<Voyage Optimization, salvages, Green Shipping Initiatives>
diff --git a/test/graphviz/graph_hard/graphviz_113.dot b/test/graphviz/graph_hard/graphviz_113.dot
new file mode 100644
index 0000000000000000000000000000000000000000..daf35be696d70b136d75345eaf3aa20bf5c3baee
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_113.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=TD
+	N0 [label="Route Planning" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N1 [label=Navigation color="#7E57C2" fillcolor="#EDE7F6" shape=oval style=filled]
+	N2 [label="Ship Design" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N3 [label="Maritime Security" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N4 [label="Marine Research" color="#7E57C2" fillcolor="#EDE7F6" shape=plaintext style=filled]
+	N5 [label="Marine Insurance" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N6 [label="Fleet Management" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N7 [label="Voyage Optimization" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N8 [label="Fisheries Management" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N9 [label="Ship Registry" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N10 [label="Maritime Law Compliance" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N11 [label="Marine Data Analytics" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N12 [label="Autonomous Vessels" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N13 [label="Hydrographic Surveying" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	S0 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Salvage Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Digitalization of Shipping" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+		nest0_1 [label="Search and Rescue Coordination" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+		nest0_2 [label="Subsea Cable Laying" color="#7E57C2" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+		nest0_3 [label="Container Tracking" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Fuel Consumption Optimization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Port Operations" color="#AED581" fillcolor="#F0F4C3" shape=folder style=filled]
+		nest1_1 [label="Ballast Water Management" color="#AED581" fillcolor="#F0F4C3" shape=plaintext style=filled]
+		nest1_2 [label="Inland Waterway Transport" color="#7E57C2" fillcolor="#EDE7F6" shape=octagon style=filled]
+		nest1_3 [label="Terminal Management" color="#7986CB" fillcolor="#E8EAF6" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [label=docks color="#AED581" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label=regulates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest0_0 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N9 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [label=analyzes color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [label=responds color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_114.dot b/test/graphviz/graph_hard/graphviz_114.dot
new file mode 100644
index 0000000000000000000000000000000000000000..87e4f53cea91e736b009179a3d25be216fd5fbe5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_114.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=BT
+	N0 [label="Autonomous Vessels" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N1 [label="Subsea Cable Laying" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N2 [label="Digitalization of Shipping" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N3 [label="Marine Safety Inspection" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N4 [label=Bunkering color="#4285F4" fillcolor="#D0E0F8" shape=oval style=filled]
+	N5 [label="Customs Clearance" color="#E91E63" fillcolor="#FCE4EC" shape=octagon style=filled]
+	N6 [label="Port Operations" color="#A188D0" fillcolor="#DACBE3" shape=plaintext style=filled]
+	N7 [label="Freight Forwarding" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+	N8 [label="Vessel Chartering" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N9 [label="Container Tracking" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N10 [label="Terminal Management" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N11 [label="Route Planning" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N12 [label="Marine Insurance" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N13 [label="Inland Waterway Transport" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N14 [label="Port Congestion Management" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N15 [label="Salvage Operations" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+	N16 [label="Fleet Management" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Vessel Maintenance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Search and Rescue Coordination" color="#4285F4" fillcolor="#D0E0F8" shape=oval style=filled]
+		nest0_1 [label="Dry Docking" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Ship Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Ship Registry" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+		nest1_1 [label="Voyage Optimization" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+		nest1_2 [label=Shipbuilding color="#A188D0" fillcolor="#DACBE3" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=responds color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=complies color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N7 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N13 -> nest1_0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N13 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	M1 -> N12 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N8 -> M2 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N13 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_114.txt b/test/graphviz/graph_hard/graphviz_114.txt
new file mode 100644
index 0000000000000000000000000000000000000000..53328963d18a40c2c572bc4cbdcf3514fc768338
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_114.txt
@@ -0,0 +1,41 @@
+<Autonomous Vessels, connectedTo, Inland Waterway Transport>
+<Autonomous Vessels, connectedTo, Subsea Cable Laying>
+<Bunkering, connectedTo, Customs Clearance>
+<Container Tracking, connectedTo, Terminal Management>
+<Customs Clearance, responds, Port Operations>
+<Digitalization of Shipping, connectedTo, Customs Clearance>
+<Digitalization of Shipping, connectedTo, Freight Forwarding>
+<Digitalization of Shipping, connectedTo, Marine Insurance>
+<Digitalization of Shipping, connectedTo, Marine Safety Inspection>
+<Digitalization of Shipping, connectedTo, Port Operations>
+<Dry Docking, connectedTo, Freight Forwarding>
+<Dry Docking, partOf, Dry Docking>
+<Freight Forwarding, connectedTo, Inland Waterway Transport>
+<Freight Forwarding, connectedTo, Terminal Management>
+<Freight Forwarding, connectedTo, Vessel Chartering>
+<Inland Waterway Transport, connectedTo, Port Congestion Management>
+<Inland Waterway Transport, connectedTo, Ship Registry>
+<Marine Insurance, connectedTo, Inland Waterway Transport>
+<Marine Safety Inspection, connectedTo, Bunkering>
+<Marine Safety Inspection, connectedTo, Marine Insurance>
+<Port Congestion Management, connectedTo, Salvage Operations>
+<Port Operations, connectedTo, Container Tracking>
+<Port Operations, connectedTo, Freight Forwarding>
+<Port Operations, connectedTo, Inland Waterway Transport>
+<Port Operations, connectedTo, Marine Insurance>
+<Port Operations, connectedTo, Search and Rescue Coordination>
+<Route Planning, connectedTo, Marine Insurance>
+<Salvage Operations, connectedTo, Fleet Management>
+<Search and Rescue Coordination, connectedTo, Dry Docking>
+<Search and Rescue Coordination, partOf, Search and Rescue Coordination>
+<Ship Registry, connectedTo, Voyage Optimization>
+<Ship Registry, partOf, Ship Registry>
+<Shipbuilding, connectedTo, Inland Waterway Transport>
+<Shipbuilding, partOf, Shipbuilding>
+<Subsea Cable Laying, connectedTo, Digitalization of Shipping>
+<Terminal Management, connectedTo, Route Planning>
+<Vessel Chartering, complies, Container Tracking>
+<Vessel Chartering, connectedTo, Inland Waterway Transport>
+<Vessel Chartering, connectedTo, Marine Insurance>
+<Voyage Optimization, connectedTo, Shipbuilding>
+<Voyage Optimization, partOf, Voyage Optimization>
diff --git a/test/graphviz/graph_hard/graphviz_115.dot b/test/graphviz/graph_hard/graphviz_115.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9a1edeb1718876d9596600ed4100d2695d6a8d01
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_115.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=TD
+	N0 [label="Scientific Data Analysis" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N1 [label="Planetary Science Research" color="#9C27B0" fillcolor="#E1BEE7" shape=hexagon style=filled]
+	N2 [label="Radiation Shielding Design" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N3 [label="Satellite Deployment" color="#FFF8A6" fillcolor="#FFFDE0" shape=Mdiamond style=filled]
+	N4 [label="Mission Control Center Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=Mdiamond style=filled]
+	N5 [label="Sample Return Missions" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N6 [label="Asteroid Mining Feasibility" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N7 [label="Deep Space Communications" color="#9C27B0" fillcolor="#E1BEE7" shape=hexagon style=filled]
+	N8 [label="Data Acquisition" color="#FFF8A6" fillcolor="#FFFDE0" shape=octagon style=filled]
+	N9 [label="Astrophysics Research" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F06292" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#F06292" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Space Station Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="International Collaboration" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+		nest0_1 [label="Re_entry Vehicle Design" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+		nest0_2 [label="New Space Technology Development" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Orbital Mechanics" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Payload Development" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+		nest1_1 [label="Lunar Exploration" color="#9C27B0" fillcolor="#E1BEE7" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S2 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N5 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	S2 -> N3 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_115.txt b/test/graphviz/graph_hard/graphviz_115.txt
new file mode 100644
index 0000000000000000000000000000000000000000..02563ad58a11159dae6894de4ede80f32b021247
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_115.txt
@@ -0,0 +1,33 @@
+<Asteroid Mining Feasibility, connectedTo, Data Acquisition>
+<Asteroid Mining Feasibility, connectedTo, Deep Space Communications>
+<Asteroid Mining Feasibility, connectedTo, International Collaboration>
+<Data Acquisition, connectedTo, Astrophysics Research>
+<Deep Space Communications, connectedTo, Data Acquisition>
+<International Collaboration, connectedTo, Re_entry Vehicle Design>
+<International Collaboration, partOf, International Collaboration>
+<Lunar Exploration, connectedTo, Deep Space Communications>
+<Lunar Exploration, partOf, Lunar Exploration>
+<Mission Control Center Management, connectedTo, Payload Development>
+<Mission Control Center Management, connectedTo, Sample Return Missions>
+<New Space Technology Development, connectedTo, Sample Return Missions>
+<New Space Technology Development, partOf, New Space Technology Development>
+<Payload Development, connectedTo, Lunar Exploration>
+<Payload Development, partOf, Payload Development>
+<Planetary Science Research, connectedTo, Asteroid Mining Feasibility>
+<Planetary Science Research, connectedTo, Data Acquisition>
+<Planetary Science Research, connectedTo, Deep Space Communications>
+<Planetary Science Research, connectedTo, Radiation Shielding Design>
+<Planetary Science Research, connectedTo, Satellite Deployment>
+<Radiation Shielding Design, connectedTo, Satellite Deployment>
+<Re_entry Vehicle Design, connectedTo, New Space Technology Development>
+<Re_entry Vehicle Design, partOf, Re_entry Vehicle Design>
+<Sample Return Missions, connectedTo, Asteroid Mining Feasibility>
+<Sample Return Missions, connectedTo, Astrophysics Research>
+<Sample Return Missions, connectedTo, Data Acquisition>
+<Sample Return Missions, connectedTo, Deep Space Communications>
+<Satellite Deployment, connectedTo, Mission Control Center Management>
+<Scientific Data Analysis, connectedTo, Astrophysics Research>
+<Scientific Data Analysis, connectedTo, Data Acquisition>
+<Scientific Data Analysis, connectedTo, Planetary Science Research>
+<Scientific Data Analysis, connectedTo, Sample Return Missions>
+<Scientific Data Analysis, connectedTo, Satellite Deployment>
diff --git a/test/graphviz/graph_hard/graphviz_116.dot b/test/graphviz/graph_hard/graphviz_116.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b4fa62bcec724d0d3ca9cfe609f3d8b715d79a22
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_116.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=TD
+	N0 [label="Re_entry Vehicle Design" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Astronaut Training" color="#6FE1D5" fillcolor="#C9EFEC" shape=oval style=filled]
+	N2 [label="Space Weather Forecasting" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N3 [label="Space Station Operations" color="#6FE1D5" fillcolor="#C9EFEC" shape=octagon style=filled]
+	N4 [label="Rocket Propulsion Development" color="#5C6BC0" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N5 [label="Orbital Mechanics" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N6 [label="Space Debris Mitigation" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N7 [label="Mars Mission Planning" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N8 [label="New Space Technology Development" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Planetary Science Research" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Satellite Deployment" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest0_1 [label="Commercial Space Flight Regulation" color="#5C6BC0" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+		nest0_2 [label="Life Support Systems" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Launch Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="International Collaboration" color="#FFF176" fillcolor="#FFFDE7" shape=octagon style=filled]
+		nest1_1 [label="Lunar Exploration" color="#5C6BC0" fillcolor="#E8EAF6" shape=plaintext style=filled]
+		nest1_2 [label="Exoplanet Discovery" color="#6FE1D5" fillcolor="#C9EFEC" shape=octagon style=filled]
+		nest1_3 [label="Microgravity Experiments" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [label=tests color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [label=maintains color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_116.txt b/test/graphviz/graph_hard/graphviz_116.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b5f23f4525b38adf8009a9b61afb826881bd4be6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_116.txt
@@ -0,0 +1,30 @@
+<Astronaut Training, connectedTo, Space Weather Forecasting>
+<Commercial Space Flight Regulation, connectedTo, Life Support Systems>
+<Commercial Space Flight Regulation, partOf, Commercial Space Flight Regulation>
+<Exoplanet Discovery, partOf, Exoplanet Discovery>
+<Exoplanet Discovery, tests, Microgravity Experiments>
+<International Collaboration, connectedTo, Lunar Exploration>
+<International Collaboration, partOf, International Collaboration>
+<Life Support Systems, connectedTo, Space Debris Mitigation>
+<Life Support Systems, partOf, Life Support Systems>
+<Lunar Exploration, connectedTo, Exoplanet Discovery>
+<Lunar Exploration, partOf, Lunar Exploration>
+<Mars Mission Planning, connectedTo, New Space Technology Development>
+<Microgravity Experiments, connectedTo, Rocket Propulsion Development>
+<Microgravity Experiments, partOf, Microgravity Experiments>
+<Orbital Mechanics, connectedTo, Satellite Deployment>
+<Orbital Mechanics, connectedTo, Space Debris Mitigation>
+<Re_entry Vehicle Design, connectedTo, Astronaut Training>
+<Rocket Propulsion Development, connectedTo, International Collaboration>
+<Rocket Propulsion Development, connectedTo, Mars Mission Planning>
+<Rocket Propulsion Development, connectedTo, New Space Technology Development>
+<Rocket Propulsion Development, connectedTo, Orbital Mechanics>
+<Rocket Propulsion Development, connectedTo, Space Debris Mitigation>
+<Rocket Propulsion Development, maintains, New Space Technology Development>
+<Satellite Deployment, connectedTo, Commercial Space Flight Regulation>
+<Satellite Deployment, partOf, Satellite Deployment>
+<Space Debris Mitigation, connectedTo, Mars Mission Planning>
+<Space Station Operations, connectedTo, Mars Mission Planning>
+<Space Station Operations, connectedTo, Rocket Propulsion Development>
+<Space Weather Forecasting, connectedTo, Mars Mission Planning>
+<Space Weather Forecasting, connectedTo, Space Station Operations>
diff --git a/test/graphviz/graph_hard/graphviz_117.dot b/test/graphviz/graph_hard/graphviz_117.dot
new file mode 100644
index 0000000000000000000000000000000000000000..45cfe4ff8cf385634c0d9d8f87236412a8c0c545
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_117.dot
@@ -0,0 +1,53 @@
+digraph {
+	rankdir=BT
+	N0 [label="New Space Technology Development" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N1 [label="Exoplanet Discovery" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N2 [label="Planetary Science Research" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N3 [label="Astronaut Training" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+	N4 [label="Spacecraft Control" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N5 [label="Mission Control Center Management" color="#80DDEA" fillcolor="#D3F7F9" shape=diamond style=filled]
+	N6 [label="Data Acquisition" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N7 [label="Scientific Data Analysis" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+	N8 [label="Extravehicular Activity Planning" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	S0 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Rocket Propulsion Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Space Debris Mitigation" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+		nest0_1 [label="Satellite Deployment" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Orbital Mechanics" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Launch Operations" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+		nest1_1 [label="Astrophysics Research" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+		nest1_2 [label="In_Situ Resource Utilization" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=regulates color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=receives color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=secures color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N3 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N0 -> S1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S1 -> N3 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_118.dot b/test/graphviz/graph_hard/graphviz_118.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f27fd3bef287d59334a1598b6eb22304f2785a57
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_118.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=BT
+	N0 [label="International Climate Negotiation" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Mitigation Technology Evaluation" color="#E91E63" fillcolor="#F8BBD0" shape=oval style=filled]
+	N2 [label="Public Engagement on Climate" color="#8C9EFF" fillcolor="#D3D7EB" shape=oval style=filled]
+	N3 [label="Adaptation Strategy Development" color="#8C9EFF" fillcolor="#D3D7EB" shape=diamond style=filled]
+	N4 [label="Aerosol Impact Assessment" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N5 [label="Water Resource Management under Climate Change" color="#E91E63" fillcolor="#F8BBD0" shape=oval style=filled]
+	N6 [label="Cloud Formation Research" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N7 [label="Solar Radiation Management Research" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N8 [label="Climate Education Programs" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N9 [label="Ocean Current Analysis" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N10 [label="Green Technology Incubation" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N11 [label="Glacier Mass Balance Monitoring" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S0 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Atmospheric Monitoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Drought Monitoring and Forecasting" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+		nest0_1 [label="Ecological Footprint Calculation" color="#E91E63" fillcolor="#F8BBD0" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Remote Sensing for Climate" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Climate Finance Tracking" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest1_1 [label="Environmental Justice Study" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+		nest1_2 [label="Paleoclimate Reconstruction" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+		nest1_3 [label="Ecosystem Response Modeling" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=observes color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_119.txt b/test/graphviz/graph_hard/graphviz_119.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ed8979923d30ad2ee2381431236166411dbf6e9d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_119.txt
@@ -0,0 +1,30 @@
+<Arctic and Antarctic Research, connectedTo, Glacier Mass Balance Monitoring>
+<Arctic and Antarctic Research, partOf, Arctic and Antarctic Research>
+<Atmospheric Monitoring, connectedTo, Ocean Acidification Studies>
+<Carbon Sequestration Technologies, connectedTo, Ecosystem Response Modeling>
+<Carbon Sequestration Technologies, partOf, Carbon Sequestration Technologies>
+<Climate Change Vulnerability Assessment, connectedTo, Arctic and Antarctic Research>
+<Climate Change Vulnerability Assessment, partOf, Climate Change Vulnerability Assessment>
+<Data Collection, connectedTo, Permafrost Thaw Assessment>
+<Data Collection, connectedTo, Renewable Energy Potential Assessment>
+<Ecological Footprint Calculation, connectedTo, Atmospheric Monitoring>
+<Ecosystem Response Modeling, connectedTo, Ecological Footprint Calculation>
+<Ecosystem Response Modeling, partOf, Ecosystem Response Modeling>
+<Environmental Justice Study, connectedTo, Atmospheric Monitoring>
+<Environmental Justice Study, connectedTo, Ecological Footprint Calculation>
+<Environmental Justice Study, connectedTo, Ocean Acidification Studies>
+<Environmental Justice Study, connectedTo, Paleoclimate Reconstruction>
+<Glacier Mass Balance Monitoring, connectedTo, Carbon Sequestration Technologies>
+<Glacier Mass Balance Monitoring, validates, Renewable Energy Potential Assessment>
+<Ice Sheet Dynamics, connectedTo, Environmental Justice Study>
+<Ice Sheet Dynamics, connectedTo, Ocean Acidification Studies>
+<Paleoclimate Reconstruction, connectedTo, Ecological Footprint Calculation>
+<Paleoclimate Reconstruction, connectedTo, Ocean Acidification Studies>
+<Permafrost Thaw Assessment, connectedTo, Glacier Mass Balance Monitoring>
+<Permafrost Thaw Assessment, connectedTo, Renewable Energy Potential Assessment>
+<Renewable Energy Potential Assessment, connectedTo, Atmospheric Monitoring>
+<Renewable Energy Potential Assessment, connectedTo, Climate Change Vulnerability Assessment>
+<Renewable Energy Potential Assessment, connectedTo, Ecological Footprint Calculation>
+<Renewable Energy Potential Assessment, connectedTo, Environmental Justice Study>
+<Renewable Energy Potential Assessment, connectedTo, Ice Sheet Dynamics>
+<Renewable Energy Potential Assessment, connectedTo, Ocean Acidification Studies>
diff --git a/test/graphviz/graph_hard/graphviz_12.dot b/test/graphviz/graph_hard/graphviz_12.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b601be2fb312d4281b86797be152e1fd0845415e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_12.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=RL
+	N0 [label="Internship Coordination" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N1 [label="Counseling Session" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N2 [label="Online Learning Platform Management" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N3 [label="Disciplinary Action" color="#FFE470" fillcolor="#FFFAE0" shape=plaintext style=filled]
+	N4 [label="Exam Conduct" color="#FFE470" fillcolor="#FFFAE0" shape=folder style=filled]
+	N5 [label="Alumni Network Management" color="#FFE470" fillcolor="#FFFAE0" shape=plaintext style=filled]
+	N6 [label="Field Trip Coordination" color="#03A9F4" fillcolor="#B3E5FC" shape=hexagon style=filled]
+	N7 [label="Career Services" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N8 [label="Thesis Submission" color="#03A9F4" fillcolor="#B3E5FC" shape=folder style=filled]
+	N9 [label="Graduation Approval" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N10 [label="Academic Review" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N11 [label="Student Enrollment" color="#9C27B0" fillcolor="#E1BEE7" shape=Mdiamond style=filled]
+	N12 [label="Student Feedback Collection" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N13 [label="Timetable Scheduling" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+	N14 [label="Transcript Issuance" color="#03A9F4" fillcolor="#B3E5FC" shape=plaintext style=filled]
+	N15 [label="Curriculum Development" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+	N16 [label="School Accreditation" color="#03A9F4" fillcolor="#B3E5FC" shape=octagon style=filled]
+	N17 [label="Grade Entry" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N18 [label="Course Material Preparation" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N19 [label="Student Application" color="#9C27B0" fillcolor="#E1BEE7" shape=parallelogram style=filled]
+	N20 [label=Orientation color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	S0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Club Registration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Course Selection" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+		nest0_1 [label="Extracurricular Activity" color="#03A9F4" fillcolor="#B3E5FC" shape=octagon style=filled]
+		nest0_2 [label="Scholarship Evaluation" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Assignment Submission" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Digital Resource Management" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+		nest1_1 [label="Research Grant Application" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N18 -> N19 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N19 -> N20 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N11 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_12.txt b/test/graphviz/graph_hard/graphviz_12.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f3e42d32762079141280795e0a74b83cd2d5e88f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_12.txt
@@ -0,0 +1,39 @@
+<Academic Review, connectedTo, Student Enrollment>
+<Alumni Network Management, connectedTo, Field Trip Coordination>
+<Career Services, connectedTo, Course Selection>
+<Career Services, connectedTo, Digital Resource Management>
+<Career Services, connectedTo, Thesis Submission>
+<Counseling Session, connectedTo, Alumni Network Management>
+<Counseling Session, connectedTo, Online Learning Platform Management>
+<Course Material Preparation, connectedTo, Student Application>
+<Course Selection, connectedTo, Extracurricular Activity>
+<Course Selection, partOf, Course Selection>
+<Curriculum Development, connectedTo, School Accreditation>
+<Digital Resource Management, connectedTo, Research Grant Application>
+<Digital Resource Management, partOf, Digital Resource Management>
+<Disciplinary Action, connectedTo, Alumni Network Management>
+<Disciplinary Action, connectedTo, Exam Conduct>
+<Exam Conduct, connectedTo, Alumni Network Management>
+<Exam Conduct, connectedTo, Curriculum Development>
+<Exam Conduct, connectedTo, Grade Entry>
+<Extracurricular Activity, connectedTo, Scholarship Evaluation>
+<Extracurricular Activity, partOf, Extracurricular Activity>
+<Field Trip Coordination, connectedTo, Career Services>
+<Grade Entry, connectedTo, Course Material Preparation>
+<Graduation Approval, connectedTo, Academic Review>
+<Internship Coordination, connectedTo, Counseling Session>
+<Online Learning Platform Management, connectedTo, Academic Review>
+<Online Learning Platform Management, connectedTo, Disciplinary Action>
+<Online Learning Platform Management, connectedTo, Student Feedback Collection>
+<Online Learning Platform Management, connectedTo, Timetable Scheduling>
+<Research Grant Application, connectedTo, Career Services>
+<Research Grant Application, partOf, Research Grant Application>
+<Scholarship Evaluation, connectedTo, Student Enrollment>
+<Scholarship Evaluation, partOf, Scholarship Evaluation>
+<School Accreditation, connectedTo, Grade Entry>
+<Student Application, connectedTo, Orientation>
+<Student Enrollment, connectedTo, Student Feedback Collection>
+<Student Feedback Collection, connectedTo, Timetable Scheduling>
+<Thesis Submission, connectedTo, Graduation Approval>
+<Timetable Scheduling, connectedTo, Transcript Issuance>
+<Transcript Issuance, connectedTo, Curriculum Development>
diff --git a/test/graphviz/graph_hard/graphviz_120.dot b/test/graphviz/graph_hard/graphviz_120.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fb834ab0a2a1500183a7684d058f5ff0f853b9ce
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_120.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=BT
+	N0 [label="Renewable Energy Potential Assessment" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N1 [label="Biodiversity Impact Assessment" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N2 [label="Carbon Cycle Research" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N3 [label="Solar Radiation Management Research" color="#FFD54F" fillcolor="#FFF8E1" shape=folder style=filled]
+	N4 [label="Glacier Mass Balance Monitoring" color="#F44336" fillcolor="#FFCDD2" shape=diamond style=filled]
+	N5 [label="Public Engagement on Climate" color="#388E3C" fillcolor="#F1F8E9" shape=Mdiamond style=filled]
+	N6 [label="Green Technology Incubation" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+	N7 [label="Climate Change Vulnerability Assessment" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N8 [label="International Climate Negotiation" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N9 [label="Cloud Formation Research" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N10 [label="Greenhouse Gas Measurement" color="#F44336" fillcolor="#FFCDD2" shape=Mdiamond style=filled]
+	N11 [label="Climate Finance Tracking" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N12 [label="Climate Impact Assessment" color="#F44336" fillcolor="#FFCDD2" shape=oval style=filled]
+	N13 [label="Indigenous Knowledge Integration" color="#FFD54F" fillcolor="#FFF8E1" shape=plaintext style=filled]
+	N14 [label="Climate Policy Analysis" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N15 [label="Remote Sensing for Climate" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N16 [label="Permafrost Thaw Assessment" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	M1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	subgraph cluster_Group0 {
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diff --git a/test/graphviz/graph_hard/graphviz_120.txt b/test/graphviz/graph_hard/graphviz_120.txt
new file mode 100644
index 0000000000000000000000000000000000000000..843b0b854f73362ae4fa5c020e21c330ea57ab67
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_120.txt
@@ -0,0 +1,43 @@
+<Adaptation Strategy Development, connectedTo, Climate Education Programs>
+<Adaptation Strategy Development, partOf, Adaptation Strategy Development>
+<Aerosol Impact Assessment, connectedTo, Arctic and Antarctic Research>
+<Aerosol Impact Assessment, partOf, Aerosol Impact Assessment>
+<Arctic and Antarctic Research, connectedTo, Climate Policy Analysis>
+<Arctic and Antarctic Research, partOf, Arctic and Antarctic Research>
+<Biodiversity Impact Assessment, connectedTo, Carbon Cycle Research>
+<Biodiversity Impact Assessment, connectedTo, Climate Change Vulnerability Assessment>
+<Biodiversity Impact Assessment, connectedTo, Green Technology Incubation>
+<Carbon Cycle Research, connectedTo, Climate Change Vulnerability Assessment>
+<Carbon Cycle Research, connectedTo, Climate Impact Assessment>
+<Carbon Cycle Research, connectedTo, Green Technology Incubation>
+<Carbon Cycle Research, connectedTo, Solar Radiation Management Research>
+<Climate Change Vulnerability Assessment, connectedTo, International Climate Negotiation>
+<Climate Education Programs, calibrates, Environmental Justice Study>
+<Climate Education Programs, partOf, Climate Education Programs>
+<Climate Finance Tracking, connectedTo, Climate Impact Assessment>
+<Climate Impact Assessment, connectedTo, Indigenous Knowledge Integration>
+<Climate Policy Analysis, connectedTo, Remote Sensing for Climate>
+<Cloud Formation Research, connectedTo, Greenhouse Gas Measurement>
+<Ecosystem Response Modeling, connectedTo, Climate Policy Analysis>
+<Ecosystem Response Modeling, partOf, Ecosystem Response Modeling>
+<Environmental Justice Study, connectedTo, Ecosystem Response Modeling>
+<Environmental Justice Study, partOf, Environmental Justice Study>
+<Glacier Mass Balance Monitoring, connectedTo, Adaptation Strategy Development>
+<Glacier Mass Balance Monitoring, connectedTo, Climate Change Vulnerability Assessment>
+<Glacier Mass Balance Monitoring, connectedTo, Public Engagement on Climate>
+<Green Technology Incubation, connectedTo, Climate Change Vulnerability Assessment>
+<Greenhouse Gas Measurement, connectedTo, Climate Finance Tracking>
+<Greenhouse Gas Measurement, connectedTo, Climate Policy Analysis>
+<Greenhouse Gas Measurement, connectedTo, Permafrost Thaw Assessment>
+<Indigenous Knowledge Integration, connectedTo, Climate Policy Analysis>
+<International Climate Negotiation, connectedTo, Climate Policy Analysis>
+<International Climate Negotiation, connectedTo, Cloud Formation Research>
+<International Climate Negotiation, connectedTo, Indigenous Knowledge Integration>
+<Mitigation Technology Evaluation, connectedTo, Aerosol Impact Assessment>
+<Mitigation Technology Evaluation, partOf, Mitigation Technology Evaluation>
+<Public Engagement on Climate, connectedTo, Green Technology Incubation>
+<Public Engagement on Climate, connectedTo, Mitigation Technology Evaluation>
+<Remote Sensing for Climate, connectedTo, Permafrost Thaw Assessment>
+<Renewable Energy Potential Assessment, connectedTo, Biodiversity Impact Assessment>
+<Solar Radiation Management Research, connectedTo, Climate Change Vulnerability Assessment>
+<Solar Radiation Management Research, policies, Glacier Mass Balance Monitoring>
diff --git a/test/graphviz/graph_hard/graphviz_121.dot b/test/graphviz/graph_hard/graphviz_121.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dd78d28e39984bba54ec605cd46159523c9f9961
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_121.dot
@@ -0,0 +1,64 @@
+digraph {
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diff --git a/test/graphviz/graph_hard/graphviz_121.txt b/test/graphviz/graph_hard/graphviz_121.txt
new file mode 100644
index 0000000000000000000000000000000000000000..78c3f699bd2302ca9a224276e45f15e1ad79a668
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_121.txt
@@ -0,0 +1,33 @@
+<Arctic Weather Research, connectedTo, Climate Change Impact Study>
+<Climate Modeling, connectedTo, Arctic Weather Research>
+<Climate Modeling, connectedTo, Fire Weather Forecasting>
+<Cloud Observation, connectedTo, Nowcasting>
+<Cloud Observation, partOf, Cloud Observation>
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+<Fire Weather Forecasting, partOf, Fire Weather Forecasting>
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+<Humidity Sensing, partOf, Humidity Sensing>
+<Hurricane Trajectory Modeling, alerts, Nowcasting>
+<Hurricane Trajectory Modeling, updates, Lightning Detection>
+<Lightning Detection, connectedTo, Climate Modeling>
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+<Meteorological Instrument Calibration, connectedTo, Hurricane Trajectory Modeling>
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+<Tornado Watch or Warning, connectedTo, Cloud Observation>
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diff --git a/test/graphviz/graph_hard/graphviz_122.txt b/test/graphviz/graph_hard/graphviz_122.txt
new file mode 100644
index 0000000000000000000000000000000000000000..57034e431172634ded9619816403aa307717851a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_122.txt
@@ -0,0 +1,37 @@
+<Atmospheric Data Collection, connectedTo, Ocean_Atmosphere Interaction Study>
+<Atmospheric Data Collection, connectedTo, Snowfall Measurement>
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+<Aviation Weather Briefing, connectedTo, Upper Air Chart Analysis>
+<Aviation Weather Briefing, studies, Snowfall Measurement>
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+<Boundary Layer Study, warns, Atmospheric Data Collection>
+<Cloud Observation, connectedTo, Meteorological Instrument Calibration>
+<Cloud Observation, partOf, Cloud Observation>
+<Drought Monitoring, connectedTo, Public Weather Briefing>
+<Fire Weather Forecasting, connectedTo, Atmospheric Data Collection>
+<Fire Weather Forecasting, connectedTo, Hurricane Trajectory Modeling>
+<Flood Prediction, connectedTo, Ocean_Atmosphere Interaction Study>
+<Flood Prediction, partOf, Flood Prediction>
+<Humidity Sensing, connectedTo, Cloud Observation>
+<Humidity Sensing, partOf, Humidity Sensing>
+<Hurricane Trajectory Modeling, connectedTo, Aviation Weather Briefing>
+<Hurricane Trajectory Modeling, connectedTo, Tornado Watch or Warning>
+<Hurricane Trajectory Modeling, reports, Ocean_Atmosphere Interaction Study>
+<Mesoscale Meteorology, maps, Ocean_Atmosphere Interaction Study>
+<Mesoscale Meteorology, partOf, Mesoscale Meteorology>
+<Meteorological Instrument Calibration, archives, Flood Prediction>
+<Meteorological Instrument Calibration, partOf, Meteorological Instrument Calibration>
+<Ocean_Atmosphere Interaction Study, connectedTo, Tropical Cyclone Analysis>
+<Public Weather Briefing, connectedTo, Aviation Weather Briefing>
+<Public Weather Briefing, connectedTo, Seasonal Outlook Preparation>
+<Satellite Meteorology, connectedTo, Aviation Weather Briefing>
+<Satellite Meteorology, connectedTo, Ocean_Atmosphere Interaction Study>
+<Satellite Meteorology, connectedTo, Synoptic Chart Analysis>
+<Seasonal Outlook Preparation, connectedTo, Mesoscale Meteorology>
+<Seasonal Outlook Preparation, partOf, Seasonal Outlook Preparation>
+<Synoptic Chart Analysis, connectedTo, Fire Weather Forecasting>
+<Tornado Watch or Warning, connectedTo, Boundary Layer Study>
+<Tornado Watch or Warning, connectedTo, Snowfall Measurement>
+<Tropical Cyclone Analysis, connectedTo, Snowfall Measurement>
+<Upper Air Chart Analysis, connectedTo, Atmospheric Data Collection>
diff --git a/test/graphviz/graph_hard/graphviz_123.dot b/test/graphviz/graph_hard/graphviz_123.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4df5451b29fc3479e6617e7f6dd9b4f32024e9fb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_123.dot
@@ -0,0 +1,86 @@
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+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=calibrates color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=identifies color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [label=warns color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest0_0 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N4 [label=advises color="#000000" dir=forward penwidth=1.5 style=solid]
+	N16 -> nest1_0 [label=collects color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N4 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S0 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N17 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N17 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N16 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [label=measures color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_124.dot b/test/graphviz/graph_hard/graphviz_124.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4137b46fcb0e1fd32075669e22e68ed687725ab1
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_124.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=BT
+	N0 [label="Textile Recycling" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N1 [label="Industrial Waste Management" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N2 [label="Waste Management Policy Development" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N3 [label="Biomedical Waste Handling" color="#42A5F5" fillcolor="#F1F8FF" shape=oval style=filled]
+	N4 [label="Community Recycling Programs" color="#FFC085" fillcolor="#FFDAB9" shape=oval style=filled]
+	N5 [label="Electronic Waste Recycling" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N6 [label="Organics Collection" color="#BDBDBD" fillcolor="#F5F5F5" shape=plaintext style=filled]
+	N7 [label="Illegal Dumping Monitoring" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N8 [label="Recycling Processing" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N9 [label="Waste Reduction Planning" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N10 [label="Waste Collection" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N11 [label="Waste Logistics Optimization" color="#BDBDBD" fillcolor="#F5F5F5" shape=folder style=filled]
+	N12 [label=Composting color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+	N13 [label="Container Management" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N14 [label="Glass Recycling" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N15 [label="Construction and Demolition Waste Management" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N16 [label="Smart Waste Bins" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N17 [label="Waste_to_Energy Conversion" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	S0 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Extended Producer Responsibility" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Zero Waste Initiatives" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+		nest0_1 [label="Transfer Station Management" color="#FFC085" fillcolor="#FFDAB9" shape=plaintext style=filled]
+		nest0_2 [label="Paper Recycling" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Anaerobic Digestion" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Public Education on Waste" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest1_1 [label="Hazardous Waste Disposal" color="#42A5F5" fillcolor="#F1F8FF" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [label=educates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=grades color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N15 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [label=audits color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S1 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_125.txt b/test/graphviz/graph_hard/graphviz_125.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4dad6808c361d55e8670a318f344d68c0a004d16
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_125.txt
@@ -0,0 +1,47 @@
+<Anaerobic Digestion, connectedTo, Circular Economy Initiatives>
+<Anaerobic Digestion, connectedTo, Waste Management Policy Development>
+<Circular Economy Initiatives, connectedTo, Organics Collection>
+<Community Recycling Programs, connectedTo, Waste Audit>
+<Community Recycling Programs, partOf, Community Recycling Programs>
+<Composting, connectedTo, Public Education on Waste>
+<Composting, controls, Recycling Processing>
+<Composting, enforces, Anaerobic Digestion>
+<Electronic Waste Recycling, connectedTo, Waste Collection>
+<Electronic Waste Recycling, partOf, Electronic Waste Recycling>
+<Hazardous Waste Disposal, connectedTo, Anaerobic Digestion>
+<Hazardous Waste Disposal, connectedTo, Recycling Processing>
+<Hazardous Waste Disposal, connectedTo, Textile Recycling>
+<Hazardous Waste Disposal, connectedTo, Waste Collection>
+<Hazardous Waste Disposal, connectedTo, Waste Sorting>
+<Hazardous Waste Disposal, recycles, Waste Reduction Planning>
+<Illegal Dumping Monitoring, connectedTo, Hazardous Waste Disposal>
+<Landfill Operation, composts, Circular Economy Initiatives>
+<Landfill Operation, connectedTo, Anaerobic Digestion>
+<Landfill Operation, connectedTo, Recycling Processing>
+<Organics Collection, connectedTo, Waste Characterization Study>
+<Paper Recycling, connectedTo, Community Recycling Programs>
+<Paper Recycling, partOf, Paper Recycling>
+<Plastic Recycling Technologies, connectedTo, Recycling Processing>
+<Plastic Recycling Technologies, connectedTo, Waste Audit>
+<Public Education on Waste, connectedTo, Anaerobic Digestion>
+<Public Education on Waste, grades, Illegal Dumping Monitoring>
+<Recycling Processing, connectedTo, Anaerobic Digestion>
+<Textile Recycling, connectedTo, Waste Logistics Optimization>
+<Textile Recycling, minimizes, Paper Recycling>
+<Transfer Station Management, connectedTo, Electronic Waste Recycling>
+<Transfer Station Management, partOf, Transfer Station Management>
+<Waste Audit, connectedTo, Anaerobic Digestion>
+<Waste Audit, connectedTo, Waste Logistics Optimization>
+<Waste Audit, connectedTo, Waste Management Policy Development>
+<Waste Audit, connectedTo, Waste Sorting>
+<Waste Audit, licenses, Waste_to_Energy Conversion>
+<Waste Characterization Study, connectedTo, Textile Recycling>
+<Waste Collection, connectedTo, Waste Reduction Planning>
+<Waste Management Policy Development, connectedTo, Circular Economy Initiatives>
+<Waste Reduction Planning, connectedTo, Recycling Processing>
+<Waste Reduction Planning, sorts, Plastic Recycling Technologies>
+<Waste Sorting, connectedTo, Circular Economy Initiatives>
+<Waste Sorting, connectedTo, Landfill Operation>
+<Waste Sorting, connectedTo, Recycling Processing>
+<Waste_to_Energy Conversion, innovates, Transfer Station Management>
+<Waste_to_Energy Conversion, partOf, Waste_to_Energy Conversion>
diff --git a/test/graphviz/graph_hard/graphviz_126.txt b/test/graphviz/graph_hard/graphviz_126.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fe5f686f5ec59696d256e528680e7b1eb9815229
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_126.txt
@@ -0,0 +1,34 @@
+<Anaerobic Digestion, connectedTo, Container Management>
+<Anaerobic Digestion, partOf, Anaerobic Digestion>
+<Circular Economy Initiatives, connectedTo, Transfer Station Management>
+<Circular Economy Initiatives, partOf, Circular Economy Initiatives>
+<Closed_Loop Systems, connectedTo, Container Management>
+<Closed_Loop Systems, connectedTo, Landfill Gas Collection>
+<Composting, connectedTo, Closed_Loop Systems>
+<Composting, connectedTo, Landfill Gas Collection>
+<Construction and Demolition Waste Management, connectedTo, Metal Recycling>
+<Container Management, connectedTo, Landfill Gas Collection>
+<Electronic Waste Recycling, connectedTo, Waste Compaction>
+<Extended Producer Responsibility, connectedTo, Construction and Demolition Waste Management>
+<Extended Producer Responsibility, connectedTo, Organics Collection>
+<Industrial Waste Management, connectedTo, Recycling Processing>
+<Landfill Gas Collection, connectedTo, Metal Recycling>
+<Landfill Gas Collection, connectedTo, Recycling Processing>
+<Landfill Gas Collection, connectedTo, Waste Management Data Analytics>
+<Material Recovery Facility Operation, connectedTo, Paper Recycling>
+<Metal Recycling, connectedTo, Material Recovery Facility Operation>
+<Organics Collection, connectedTo, Waste Reduction Planning>
+<Organics Collection, partOf, Organics Collection>
+<Recycling Processing, connectedTo, Smart Waste Bins>
+<Smart Waste Bins, connectedTo, Extended Producer Responsibility>
+<Transfer Station Management, connectedTo, Recycling Processing>
+<Transfer Station Management, partOf, Transfer Station Management>
+<Waste Compaction, connectedTo, Industrial Waste Management>
+<Waste Management Data Analytics, connectedTo, Circular Economy Initiatives>
+<Waste Management Data Analytics, connectedTo, Electronic Waste Recycling>
+<Waste Management Data Analytics, connectedTo, Material Recovery Facility Operation>
+<Waste Management Data Analytics, connectedTo, Smart Waste Bins>
+<Waste Reduction Planning, connectedTo, Waste Sorting>
+<Waste Reduction Planning, partOf, Waste Reduction Planning>
+<Waste Sorting, connectedTo, Anaerobic Digestion>
+<Waste Sorting, partOf, Waste Sorting>
diff --git a/test/graphviz/graph_hard/graphviz_127.dot b/test/graphviz/graph_hard/graphviz_127.dot
new file mode 100644
index 0000000000000000000000000000000000000000..22e91db65e4778e1d32e24dd17386fe44917c982
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_127.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=RL
+	N0 [label="Wastewater Treatment" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Stormwater Management" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N2 [label="Pollution Source Identification" color="#FBC02D" fillcolor="#FFFDE7" shape=oval style=filled]
+	N3 [label="Water Source Identification" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N4 [label="Reservoir Operation" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N5 [label="Climate Change Adaptation for Water" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N6 [label="Agricultural Water Use Efficiency" color="#D3EB9F" fillcolor="#F8FDD3" shape=diamond style=filled]
+	N7 [label="Dam Management" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N8 [label="Water Meter Reading" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N9 [label="Sewer System Inspection" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N10 [label="Water Loss Detection" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N11 [label=Desalination color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N12 [label="Billing and Revenue Management" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N13 [label="Water Infrastructure Maintenance" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+	N14 [label="Water Quality Monitoring" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N15 [label="Ecosystem Protection" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N16 [label="Groundwater Management" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Water Conservation Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Watershed Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=plaintext style=filled]
+		nest0_1 [label="Industrial Water Use Optimization" color="#FBC02D" fillcolor="#FFFDE7" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Smart Water Networks" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Water Treatment" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+		nest1_1 [label="Wastewater Collection" color="#FBC02D" fillcolor="#FFFDE7" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [label=allocates color="#AED581" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=regulates color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=permits color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N15 -> nest0_0 [label=licenses color="#AED581" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N7 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest1_0 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N7 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S0 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S2 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	S2 -> N16 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [label=maintains color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	M0 -> N13 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_128.dot b/test/graphviz/graph_hard/graphviz_128.dot
new file mode 100644
index 0000000000000000000000000000000000000000..83f88f79a3844c6bb4c2be79169c51dfa02268e9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_128.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=LR
+	N0 [label="Groundwater Management" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N1 [label="Greywater Recycling" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N2 [label="Water Treatment" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N3 [label="Climate Change Adaptation for Water" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N4 [label="Water Meter Reading" color="#BCB88A" fillcolor="#F5F5DC" shape=plaintext style=filled]
+	N5 [label="Reservoir Operation" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N6 [label="Water Rights Management" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N7 [label="Transboundary Water Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=plaintext style=filled]
+	N8 [label="Irrigation Management" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N9 [label="Environmental Flow Assessment" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N10 [label="Piping Network Repair" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N11 [label="Hydrological Modeling" color="#FFCC7A" fillcolor="#FFF6D9" shape=oval style=filled]
+	N12 [label="Sewer System Inspection" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N13 [label="Flood Control" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N14 [label="Watershed Management" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N15 [label="Rainwater Harvesting" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	S0 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Industrial Water Use Optimization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Wastewater Treatment" color="#FF5722" fillcolor="#FFCCBC" shape=folder style=filled]
+		nest0_1 [label="Dam Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Water Distribution" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Pollution Source Identification" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+		nest1_1 [label="Water Resource Planning" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+		nest1_2 [label="Smart Water Networks" color="#BCB88A" fillcolor="#F5F5DC" shape=oval style=filled]
+		nest1_3 [label="Agricultural Water Use Efficiency" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+		nest1_0 -> nest1_3 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=predicts color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N14 [label=allocates color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N14 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N9 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_128.txt b/test/graphviz/graph_hard/graphviz_128.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d34ecf06427cec356d396f58539abd4164fbbe67
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_128.txt
@@ -0,0 +1,36 @@
+<Agricultural Water Use Efficiency, connectedTo, Environmental Flow Assessment>
+<Agricultural Water Use Efficiency, partOf, Agricultural Water Use Efficiency>
+<Climate Change Adaptation for Water, connectedTo, Transboundary Water Management>
+<Climate Change Adaptation for Water, connectedTo, Water Meter Reading>
+<Dam Management, allocates, Watershed Management>
+<Dam Management, partOf, Dam Management>
+<Environmental Flow Assessment, connectedTo, Piping Network Repair>
+<Flood Control, connectedTo, Watershed Management>
+<Greywater Recycling, connectedTo, Water Treatment>
+<Groundwater Management, connectedTo, Greywater Recycling>
+<Groundwater Management, connectedTo, Transboundary Water Management>
+<Hydrological Modeling, connectedTo, Sewer System Inspection>
+<Irrigation Management, connectedTo, Environmental Flow Assessment>
+<Piping Network Repair, connectedTo, Hydrological Modeling>
+<Pollution Source Identification, connectedTo, Agricultural Water Use Efficiency>
+<Pollution Source Identification, connectedTo, Water Resource Planning>
+<Pollution Source Identification, partOf, Pollution Source Identification>
+<Reservoir Operation, connectedTo, Hydrological Modeling>
+<Reservoir Operation, connectedTo, Transboundary Water Management>
+<Reservoir Operation, predicts, Water Rights Management>
+<Sewer System Inspection, connectedTo, Flood Control>
+<Smart Water Networks, connectedTo, Agricultural Water Use Efficiency>
+<Smart Water Networks, partOf, Smart Water Networks>
+<Transboundary Water Management, connectedTo, Irrigation Management>
+<Wastewater Treatment, connectedTo, Dam Management>
+<Wastewater Treatment, partOf, Wastewater Treatment>
+<Water Meter Reading, connectedTo, Reservoir Operation>
+<Water Meter Reading, connectedTo, Transboundary Water Management>
+<Water Resource Planning, connectedTo, Smart Water Networks>
+<Water Resource Planning, partOf, Water Resource Planning>
+<Water Rights Management, connectedTo, Transboundary Water Management>
+<Water Rights Management, connectedTo, Wastewater Treatment>
+<Water Treatment, connectedTo, Climate Change Adaptation for Water>
+<Water Treatment, connectedTo, Transboundary Water Management>
+<Watershed Management, connectedTo, Pollution Source Identification>
+<Watershed Management, connectedTo, Rainwater Harvesting>
diff --git a/test/graphviz/graph_hard/graphviz_129.dot b/test/graphviz/graph_hard/graphviz_129.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3bf492937967a23933e32d3ec821ae9b7e4bbc7f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_129.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=RL
+	N0 [label="Water Meter Reading" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N1 [label="Sewer System Inspection" color="#61CAC3" fillcolor="#C2E8E6" shape=plaintext style=filled]
+	N2 [label="Irrigation Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=octagon style=filled]
+	N3 [label="Drinking Water Standards Compliance" color="#FFC107" fillcolor="#FFECB3" shape=oval style=filled]
+	N4 [label="Dam Management" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N5 [label="Greywater Recycling" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N6 [label="Agricultural Water Use Efficiency" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N7 [label="Hydroelectric Power Generation" color="#FFC107" fillcolor="#FFECB3" shape=oval style=filled]
+	N8 [label="Water Resource Planning" color="#F7BEE0" fillcolor="#FAEBF3" shape=folder style=filled]
+	N9 [label="Industrial Water Use Optimization" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	S0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Hydrological Modeling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Desalination color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+		nest0_1 [label="Flood Control" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Piping Network Repair" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Water Scarcity Mitigation" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest1_1 [label="Watershed Management" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=evaluates color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N1 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N4 -> S2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_13.dot b/test/graphviz/graph_hard/graphviz_13.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6b40edb7693d37a4ffc223cee5ace7086c98b2c9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_13.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=LR
+	N0 [label="Live Chat Support" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Data Analytics Reporting" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N2 [label=Checkout color="#A188DB" fillcolor="#DED7F0" shape=plaintext style=filled]
+	N3 [label="Social Media Integration" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N4 [label="Refund Process" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N5 [label=Payment color="#4CAF50" fillcolor="#C8E6C9" shape=oval style=filled]
+	N6 [label="Customer Review" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N7 [label="Invoice Generation" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N8 [label="Wishlist Management" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N9 [label="Add to Cart" color="#90A4AE" fillcolor="#ECEFF1" shape=octagon style=filled]
+	N10 [label="Product Listing" color="#A188DB" fillcolor="#DED7F0" shape=plaintext style=filled]
+	N11 [label="Product Recommendation" color="#A188DB" fillcolor="#DED7F0" shape=Mdiamond style=filled]
+	N12 [label="Marketing Campaign Launch" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N13 [label="Fraud Detection" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N14 [label="Cart Abandonment" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Affiliate Marketing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Gift Card Purchase" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+		nest0_1 [label="Inventory Update" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+		nest0_2 [label="Mobile App Interaction" color="#4CAF50" fillcolor="#C8E6C9" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Price Adjustment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Search Engine Optimization" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+		nest1_1 [label="Order Confirmation" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=updates color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=generates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=searches color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [label=sorts color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N13 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N8 -> S2 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [label=secures color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_13.txt b/test/graphviz/graph_hard/graphviz_13.txt
new file mode 100644
index 0000000000000000000000000000000000000000..594323ef9ac51673cf71f22822ab50c397de8679
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_13.txt
@@ -0,0 +1,37 @@
+<Add to Cart, connectedTo, Product Listing>
+<Checkout, connectedTo, Customer Review>
+<Checkout, connectedTo, Payment>
+<Checkout, connectedTo, Social Media Integration>
+<Checkout, connectedTo, Wishlist Management>
+<Customer Review, connectedTo, Add to Cart>
+<Customer Review, connectedTo, Invoice Generation>
+<Customer Review, connectedTo, Marketing Campaign Launch>
+<Customer Review, connectedTo, Product Recommendation>
+<Data Analytics Reporting, connectedTo, Checkout>
+<Data Analytics Reporting, connectedTo, Social Media Integration>
+<Data Analytics Reporting, sorts, Gift Card Purchase>
+<Fraud Detection, connectedTo, Cart Abandonment>
+<Gift Card Purchase, connectedTo, Inventory Update>
+<Gift Card Purchase, partOf, Gift Card Purchase>
+<Inventory Update, connectedTo, Mobile App Interaction>
+<Inventory Update, partOf, Inventory Update>
+<Invoice Generation, connectedTo, Search Engine Optimization>
+<Invoice Generation, updates, Wishlist Management>
+<Live Chat Support, connectedTo, Data Analytics Reporting>
+<Live Chat Support, connectedTo, Social Media Integration>
+<Marketing Campaign Launch, connectedTo, Fraud Detection>
+<Mobile App Interaction, connectedTo, Fraud Detection>
+<Mobile App Interaction, partOf, Mobile App Interaction>
+<Order Confirmation, connectedTo, Wishlist Management>
+<Order Confirmation, partOf, Order Confirmation>
+<Payment, connectedTo, Customer Review>
+<Product Listing, searches, Product Recommendation>
+<Product Recommendation, connectedTo, Marketing Campaign Launch>
+<Refund Process, connectedTo, Payment>
+<Search Engine Optimization, connectedTo, Order Confirmation>
+<Search Engine Optimization, partOf, Search Engine Optimization>
+<Social Media Integration, connectedTo, Refund Process>
+<Wishlist Management, connectedTo, Marketing Campaign Launch>
+<Wishlist Management, connectedTo, Product Listing>
+<Wishlist Management, generates, Add to Cart>
+<Wishlist Management, secures, Cart Abandonment>
diff --git a/test/graphviz/graph_hard/graphviz_130.txt b/test/graphviz/graph_hard/graphviz_130.txt
new file mode 100644
index 0000000000000000000000000000000000000000..83e0474bb0acb4d65a1a741e67c6d7ba3f0dabb8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_130.txt
@@ -0,0 +1,39 @@
+<Advanced Sorting Technologies, connectedTo, Recycling Policy Advocacy>
+<Advanced Sorting Technologies, partOf, Advanced Sorting Technologies>
+<Battery Recycling, connectedTo, Reprocessing into Raw Material>
+<Chemical Recycling, connectedTo, Mechanical Recycling>
+<Chemical Recycling, partOf, Chemical Recycling>
+<Cleaning and Processing, connectedTo, Collection Point Management>
+<Cleaning and Processing, connectedTo, Metal Recycling>
+<Closed_Loop Material Flow, connectedTo, Chemical Recycling>
+<Closed_Loop Material Flow, connectedTo, Cleaning and Processing>
+<Collection Point Management, connectedTo, New Product Manufacturing>
+<Commercial Recycling Solutions, connectedTo, Battery Recycling>
+<Commercial Recycling Solutions, connectedTo, Closed_Loop Material Flow>
+<Commercial Recycling Solutions, connectedTo, Hazardous Material Recovery>
+<Commercial Recycling Solutions, connectedTo, Industrial Recycling Programs>
+<Commercial Recycling Solutions, connectedTo, New Product Manufacturing>
+<Commercial Recycling Solutions, connectedTo, Plastic Recycling>
+<Glass Recycling, connectedTo, Battery Recycling>
+<Glass Recycling, connectedTo, Cleaning and Processing>
+<Glass Recycling, connectedTo, Material Collection>
+<Glass Recycling, connectedTo, Material Purity Testing>
+<Hazardous Material Recovery, connectedTo, Metal Recycling>
+<Hazardous Material Recovery, connectedTo, Plastic Recycling>
+<Industrial Recycling Programs, connectedTo, Closed_Loop Material Flow>
+<Life Cycle Assessment, connectedTo, Tyre Recycling>
+<Material Collection, connectedTo, Commercial Recycling Solutions>
+<Material Purity Testing, connectedTo, Metal Recycling>
+<Mechanical Recycling, connectedTo, Recycling Facility Optimization>
+<Mechanical Recycling, partOf, Mechanical Recycling>
+<Metal Recycling, processes, Battery Recycling>
+<New Product Manufacturing, connectedTo, Material Purity Testing>
+<Plastic Recycling, connectedTo, Industrial Recycling Programs>
+<Plastic Recycling, connectedTo, Product Design for Recyclability>
+<Product Design for Recyclability, connectedTo, Advanced Sorting Technologies>
+<Product Design for Recyclability, partOf, Product Design for Recyclability>
+<Recycling Facility Optimization, connectedTo, Battery Recycling>
+<Recycling Facility Optimization, partOf, Recycling Facility Optimization>
+<Recycling Policy Advocacy, connectedTo, Tyre Recycling>
+<Recycling Policy Advocacy, partOf, Recycling Policy Advocacy>
+<Tyre Recycling, connectedTo, Glass Recycling>
diff --git a/test/graphviz/graph_hard/graphviz_131.dot b/test/graphviz/graph_hard/graphviz_131.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6d2a171d718d00051bce6796ff4596eb7ffc4fcd
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_131.dot
@@ -0,0 +1,83 @@
+digraph {
+	rankdir=LR
+	N0 [label="Metal Recycling" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N1 [label="Material Collection" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N2 [label="Recycling Policy Advocacy" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N3 [label="Recycling Data Tracking" color="#00BCD4" fillcolor="#B2EBF2" shape=folder style=filled]
+	N4 [label="Textile Recycling" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N5 [label="Commercial Recycling Solutions" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N6 [label="Paper Recycling" color="#4FC3F7" fillcolor="#E1F5FE" shape=hexagon style=filled]
+	N7 [label="Cleaning and Processing" color="#4FC3F7" fillcolor="#E1F5FE" shape=hexagon style=filled]
+	N8 [label="Mechanical Recycling" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N9 [label="Tyre Recycling" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+	N10 [label="Waste Stream Analysis" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N11 [label="New Product Manufacturing" color="#00BCD4" fillcolor="#B2EBF2" shape=octagon style=filled]
+	N12 [label="Product Design for Recyclability" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	N13 [label="Waste Audit for Recycling" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N14 [label="Life Cycle Assessment" color="#4FC3F7" fillcolor="#E1F5FE" shape=oval style=filled]
+	N15 [label="Battery Recycling" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N16 [label="Contamination Reduction" color="#00BCD4" fillcolor="#B2EBF2" shape=octagon style=filled]
+	N17 [label="Collection Point Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N18 [label="Material Purity Testing" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4FC3F7" fillcolor="#E1F5FE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Glass Recycling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="End_of_Life Product Management" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+		nest0_1 [label="Electronic Waste Recycling" color="#00BCD4" fillcolor="#B2EBF2" shape=folder style=filled]
+		nest0_2 [label="Deposit_Return Schemes" color="#00BCD4" fillcolor="#B2EBF2" shape=Mdiamond style=filled]
+		nest0_3 [label="Recycling Infrastructure Development" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Construction Waste Recycling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Hazardous Material Recovery" color="#00BCD4" fillcolor="#B2EBF2" shape=folder style=filled]
+		nest1_1 [label="Composting Organic Waste" color="#4DD0E1" fillcolor="#C9F0F0" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N16 [label=treats color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N18 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [label=classifies color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N15 -> S1 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [label=certifies color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	M2 -> N11 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_131.txt b/test/graphviz/graph_hard/graphviz_131.txt
new file mode 100644
index 0000000000000000000000000000000000000000..906b5175be351961ed4d04d416cf6e5bce16aa35
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_131.txt
@@ -0,0 +1,43 @@
+<Battery Recycling, connectedTo, Collection Point Management>
+<Battery Recycling, connectedTo, Contamination Reduction>
+<Battery Recycling, connectedTo, Material Purity Testing>
+<Cleaning and Processing, connectedTo, Mechanical Recycling>
+<Collection Point Management, connectedTo, Material Purity Testing>
+<Commercial Recycling Solutions, connectedTo, Paper Recycling>
+<Composting Organic Waste, connectedTo, Material Purity Testing>
+<Composting Organic Waste, partOf, Composting Organic Waste>
+<Contamination Reduction, connectedTo, Collection Point Management>
+<Deposit_Return Schemes, connectedTo, Recycling Infrastructure Development>
+<Deposit_Return Schemes, partOf, Deposit_Return Schemes>
+<Electronic Waste Recycling, connectedTo, Deposit_Return Schemes>
+<Electronic Waste Recycling, partOf, Electronic Waste Recycling>
+<End_of_Life Product Management, connectedTo, Electronic Waste Recycling>
+<End_of_Life Product Management, partOf, End_of_Life Product Management>
+<Hazardous Material Recovery, connectedTo, Composting Organic Waste>
+<Hazardous Material Recovery, partOf, Hazardous Material Recovery>
+<Life Cycle Assessment, connectedTo, Battery Recycling>
+<Material Collection, connectedTo, New Product Manufacturing>
+<Material Collection, connectedTo, Recycling Data Tracking>
+<Material Collection, connectedTo, Recycling Policy Advocacy>
+<Mechanical Recycling, classifies, Collection Point Management>
+<Mechanical Recycling, connectedTo, Contamination Reduction>
+<Mechanical Recycling, connectedTo, End_of_Life Product Management>
+<Mechanical Recycling, connectedTo, New Product Manufacturing>
+<Mechanical Recycling, connectedTo, Tyre Recycling>
+<Mechanical Recycling, connectedTo, Waste Stream Analysis>
+<Metal Recycling, connectedTo, Material Collection>
+<Metal Recycling, connectedTo, Paper Recycling>
+<Metal Recycling, connectedTo, Recycling Data Tracking>
+<New Product Manufacturing, connectedTo, Product Design for Recyclability>
+<Paper Recycling, connectedTo, Cleaning and Processing>
+<Product Design for Recyclability, connectedTo, Waste Audit for Recycling>
+<Recycling Data Tracking, connectedTo, Textile Recycling>
+<Recycling Infrastructure Development, partOf, Recycling Infrastructure Development>
+<Recycling Infrastructure Development, treats, Contamination Reduction>
+<Recycling Policy Advocacy, connectedTo, Recycling Data Tracking>
+<Textile Recycling, certifies, Paper Recycling>
+<Textile Recycling, connectedTo, Commercial Recycling Solutions>
+<Tyre Recycling, connectedTo, Waste Stream Analysis>
+<Waste Audit for Recycling, connectedTo, Life Cycle Assessment>
+<Waste Stream Analysis, connectedTo, Hazardous Material Recovery>
+<Waste Stream Analysis, connectedTo, New Product Manufacturing>
diff --git a/test/graphviz/graph_hard/graphviz_132.dot b/test/graphviz/graph_hard/graphviz_132.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5785dcce1a0af206829f2039a415ea2ef006085d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_132.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=LR
+	N0 [label="Deposit_Return Schemes" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N1 [label="Waste Audit for Recycling" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N2 [label="Composting Organic Waste" color="#388E3C" fillcolor="#C8E6C9" shape=parallelogram style=filled]
+	N3 [label="Recycling Data Tracking" color="#CB9BE1" fillcolor="#F2E6F5" shape=plaintext style=filled]
+	N4 [label="Collection Point Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N5 [label="Recycling Facility Optimization" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N6 [label="Recycling Infrastructure Development" color="#CB9BE1" fillcolor="#F2E6F5" shape=oval style=filled]
+	N7 [label="Paper Recycling" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N8 [label="Energy Recovery from Non_Recyclables" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	S0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Mechanical Recycling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="New Product Manufacturing" color="#00BCD4" fillcolor="#E0F7FA" shape=diamond style=filled]
+		nest0_1 [label="Circular Economy Implementation" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+		nest0_2 [label="Reprocessing into Raw Material" color="#388E3C" fillcolor="#C8E6C9" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Cleaning and Processing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Glass Recycling" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+		nest1_1 [label="Chemical Recycling" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+		nest1_2 [label="Public Recycling Programs" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+		nest1_3 [label="Construction Waste Recycling" color="#00BCD4" fillcolor="#E0F7FA" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=melts color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N2 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S2 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_134.dot b/test/graphviz/graph_hard/graphviz_134.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0a22412a2d08891eaefd82a058edee47cbccad23
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_134.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=RL
+	N0 [label="Timber Harvesting" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N1 [label="Erosion Control" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N2 [label="GIS Mapping for Forestry" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N3 [label="Soil Conservation" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N4 [label="Illegal Logging Prevention" color="#E0E0E0" fillcolor="#EBEBEB" shape=octagon style=filled]
+	N5 [label="Forest Road Construction" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N6 [label="Urban Forestry Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=octagon style=filled]
+	N7 [label=Silviculture color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	S0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Carbon Sequestration Monitoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Forest Fire Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+		nest0_1 [label="Biodiversity Conservation in Forests" color="#D3EB9F" fillcolor="#F8FDD3" shape=octagon style=filled]
+		nest0_2 [label="Indigenous Forestry Practices" color="#BDBDBD" fillcolor="#F5F5F5" shape=octagon style=filled]
+		nest0_3 [label="Wildlife Habitat Management" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Ecological Restoration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Agroforestry Systems" color="#E0E0E0" fillcolor="#EBEBEB" shape=Mdiamond style=filled]
+		nest1_1 [label="Pest and Disease Control" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+		nest1_2 [label="Drone Surveying for Forests" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+		nest1_0 -> nest1_1 [label=maps color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [label=irrigates color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N7 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N6 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [label=restricts color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N3 [label=harvests color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N2 -> S2 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_134.txt b/test/graphviz/graph_hard/graphviz_134.txt
new file mode 100644
index 0000000000000000000000000000000000000000..306bed431c130468df071fc8b5c3ac2269e96d20
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_134.txt
@@ -0,0 +1,32 @@
+<Agroforestry Systems, maps, Pest and Disease Control>
+<Agroforestry Systems, partOf, Agroforestry Systems>
+<Biodiversity Conservation in Forests, connectedTo, Indigenous Forestry Practices>
+<Biodiversity Conservation in Forests, partOf, Biodiversity Conservation in Forests>
+<Drone Surveying for Forests, connectedTo, Urban Forestry Management>
+<Drone Surveying for Forests, partOf, Drone Surveying for Forests>
+<Erosion Control, connectedTo, Agroforestry Systems>
+<Erosion Control, connectedTo, Forest Road Construction>
+<Erosion Control, connectedTo, GIS Mapping for Forestry>
+<Erosion Control, connectedTo, Urban Forestry Management>
+<Erosion Control, harvests, Soil Conservation>
+<Erosion Control, restricts, Illegal Logging Prevention>
+<Forest Fire Management, connectedTo, Biodiversity Conservation in Forests>
+<Forest Fire Management, partOf, Forest Fire Management>
+<Forest Road Construction, connectedTo, Urban Forestry Management>
+<GIS Mapping for Forestry, connectedTo, Illegal Logging Prevention>
+<GIS Mapping for Forestry, connectedTo, Silviculture>
+<GIS Mapping for Forestry, connectedTo, Soil Conservation>
+<Illegal Logging Prevention, connectedTo, Forest Road Construction>
+<Illegal Logging Prevention, connectedTo, Silviculture>
+<Illegal Logging Prevention, connectedTo, Urban Forestry Management>
+<Indigenous Forestry Practices, connectedTo, Wildlife Habitat Management>
+<Indigenous Forestry Practices, partOf, Indigenous Forestry Practices>
+<Pest and Disease Control, connectedTo, Drone Surveying for Forests>
+<Pest and Disease Control, partOf, Pest and Disease Control>
+<Soil Conservation, connectedTo, Illegal Logging Prevention>
+<Timber Harvesting, connectedTo, Erosion Control>
+<Timber Harvesting, connectedTo, Forest Road Construction>
+<Urban Forestry Management, connectedTo, Silviculture>
+<Urban Forestry Management, irrigates, Forest Fire Management>
+<Wildlife Habitat Management, connectedTo, Silviculture>
+<Wildlife Habitat Management, partOf, Wildlife Habitat Management>
diff --git a/test/graphviz/graph_hard/graphviz_135.dot b/test/graphviz/graph_hard/graphviz_135.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4cd7afdb6f84e88ac48552d56a7a9776a500f4e5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_135.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=BT
+	N0 [label="Recreation Management" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Agroforestry Systems" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N2 [label="Wildlife Habitat Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=diamond style=filled]
+	N3 [label="Forest Carbon Accounting" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N4 [label=Afforestation color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N5 [label="Public Access Management" color="#FFA726" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N6 [label="Urban Forestry Management" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N7 [label="Forest Research" color="#FFA726" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N8 [label="Logging Operations" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N9 [label="Forest Certification" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N10 [label="Timber Harvesting" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N11 [label="Pest and Disease Control" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N12 [label="Tree Planting" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Soil Conservation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Forestry Equipment Maintenance" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+		nest0_1 [label="Indigenous Forestry Practices" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+		nest0_2 [label="Forestry Policy Development" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+		nest0_3 [label="Climate Change Adaptation in Forests" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Forestry Education" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Wood Product Manufacturing" color="#FFCC7A" fillcolor="#FFF6D9" shape=diamond style=filled]
+		nest1_1 [label="Drone Surveying for Forests" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest1_2 [label="Sustainable Forest Management" color="#DCE775" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=surveys color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest0_0 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N6 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [label=manages color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N8 -> S1 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [label=assesses color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N8 -> M2 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N9 -> M2 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N11 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_135.txt b/test/graphviz/graph_hard/graphviz_135.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e563f5cbaacdcec755e4bb1faaeec2f432347028
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_135.txt
@@ -0,0 +1,39 @@
+<Afforestation, connectedTo, Wood Product Manufacturing>
+<Afforestation, surveys, Public Access Management>
+<Agroforestry Systems, connectedTo, Wildlife Habitat Management>
+<Climate Change Adaptation in Forests, connectedTo, Urban Forestry Management>
+<Climate Change Adaptation in Forests, partOf, Climate Change Adaptation in Forests>
+<Drone Surveying for Forests, connectedTo, Sustainable Forest Management>
+<Drone Surveying for Forests, partOf, Drone Surveying for Forests>
+<Forest Carbon Accounting, connectedTo, Afforestation>
+<Forest Carbon Accounting, connectedTo, Logging Operations>
+<Forest Carbon Accounting, connectedTo, Pest and Disease Control>
+<Forest Carbon Accounting, connectedTo, Public Access Management>
+<Forest Carbon Accounting, manages, Tree Planting>
+<Forest Certification, connectedTo, Pest and Disease Control>
+<Forest Certification, connectedTo, Timber Harvesting>
+<Forest Research, connectedTo, Logging Operations>
+<Forestry Equipment Maintenance, connectedTo, Indigenous Forestry Practices>
+<Forestry Equipment Maintenance, partOf, Forestry Equipment Maintenance>
+<Forestry Policy Development, connectedTo, Climate Change Adaptation in Forests>
+<Forestry Policy Development, partOf, Forestry Policy Development>
+<Indigenous Forestry Practices, connectedTo, Forestry Policy Development>
+<Indigenous Forestry Practices, partOf, Indigenous Forestry Practices>
+<Logging Operations, connectedTo, Forest Certification>
+<Logging Operations, connectedTo, Pest and Disease Control>
+<Logging Operations, connectedTo, Tree Planting>
+<Pest and Disease Control, connectedTo, Tree Planting>
+<Public Access Management, assesses, Logging Operations>
+<Public Access Management, connectedTo, Logging Operations>
+<Public Access Management, connectedTo, Urban Forestry Management>
+<Recreation Management, connectedTo, Agroforestry Systems>
+<Recreation Management, connectedTo, Logging Operations>
+<Sustainable Forest Management, connectedTo, Public Access Management>
+<Sustainable Forest Management, partOf, Sustainable Forest Management>
+<Timber Harvesting, connectedTo, Forestry Equipment Maintenance>
+<Timber Harvesting, connectedTo, Pest and Disease Control>
+<Urban Forestry Management, connectedTo, Forest Research>
+<Urban Forestry Management, connectedTo, Logging Operations>
+<Wildlife Habitat Management, connectedTo, Forest Carbon Accounting>
+<Wood Product Manufacturing, connectedTo, Drone Surveying for Forests>
+<Wood Product Manufacturing, partOf, Wood Product Manufacturing>
diff --git a/test/graphviz/graph_hard/graphviz_136.dot b/test/graphviz/graph_hard/graphviz_136.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f0eeab9bc0e8bb327841f9758c63f4e7b912239a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_136.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=LR
+	N0 [label="Hospice Care for Animals" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Wildlife Rehabilitation" color="#FBC02D" fillcolor="#FFFDE7" shape=Mdiamond style=filled]
+	N2 [label="Pre_surgical Assessment" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N3 [label="Veterinary Technology Training" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N4 [label="Toxicology Testing" color="#81C784" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N5 [label=Surgery color="#81C784" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N6 [label="Nutritional Counseling" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N7 [label=Microchipping color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N8 [label="Imaging Services" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N9 [label="Sterilization Protocols" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N10 [label="Equine Care" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N11 [label="Laboratory Testing" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+	N12 [label="Pet Check_up" color="#81C784" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N13 [label="Medical Record Keeping" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N14 [label="Animal Welfare Assessment" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#81C784" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Livestock Disease Prevention" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Biosecurity Measures" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+		nest0_1 [label="Post_operative Care" color="#6FE1D5" fillcolor="#C9EFEC" shape=diamond style=filled]
+		nest0_2 [label="Genetic Counseling for Animals" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest0_3 [label=Vaccination color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Farm Animal Health Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Allergy Testing" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+		nest1_1 [label="Euthanasia Services" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest1_2 [label="Client Communication" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label=performs color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N12 -> nest0_0 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N11 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N13 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N10 -> S0 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N10 -> M0 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	M0 -> N13 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N14 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M2 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	M2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_138.txt b/test/graphviz/graph_hard/graphviz_138.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2d6ff4da1019ce081e316dac4e29ec7737cfea92
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_138.txt
@@ -0,0 +1,32 @@
+<Anesthesia Administration, connectedTo, Herd Health Programs>
+<Anesthesia Administration, partOf, Anesthesia Administration>
+<Client Communication, connectedTo, Reproductive Services>
+<Client Communication, connectedTo, Vaccination>
+<Client Communication, connectedTo, Wildlife Rehabilitation>
+<Genetic Counseling for Animals, admits, Reproductive Services>
+<Genetic Counseling for Animals, analyzes, Pre_surgical Assessment>
+<Herd Health Programs, connectedTo, Nutritional Counseling>
+<Laboratory Testing, manages, Pain Management>
+<Laboratory Testing, partOf, Laboratory Testing>
+<Nutritional Counseling, connectedTo, Veterinary Pathology>
+<Nutritional Counseling, connectedTo, Wildlife Rehabilitation>
+<Pain Management, connectedTo, Anesthesia Administration>
+<Pain Management, partOf, Pain Management>
+<Pet Check_up, connectedTo, Herd Health Programs>
+<Pet Check_up, partOf, Pet Check_up>
+<Post_operative Care, dispenses, Pet Check_up>
+<Post_operative Care, partOf, Post_operative Care>
+<Pre_surgical Assessment, connectedTo, Allergy Testing>
+<Pre_surgical Assessment, connectedTo, Client Communication>
+<Pre_surgical Assessment, connectedTo, Herd Health Programs>
+<Pre_surgical Assessment, connectedTo, Nutritional Counseling>
+<Pre_surgical Assessment, connectedTo, Wildlife Rehabilitation>
+<Reproductive Services, bills, Herd Health Programs>
+<Reproductive Services, connectedTo, Surgery>
+<Reproductive Services, connectedTo, Wildlife Rehabilitation>
+<Surgery, connectedTo, Post_operative Care>
+<Surgery, partOf, Surgery>
+<Vaccination, connectedTo, Reproductive Services>
+<Veterinary Pathology, connectedTo, Laboratory Testing>
+<Veterinary Pathology, partOf, Veterinary Pathology>
+<Wildlife Rehabilitation, connectedTo, Allergy Testing>
diff --git a/test/graphviz/graph_hard/graphviz_139.dot b/test/graphviz/graph_hard/graphviz_139.dot
new file mode 100644
index 0000000000000000000000000000000000000000..76ae6c6b7fafe8263c78b49296a2a8d8316af387
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_139.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=LR
+	N0 [label="Group Activities Coordination" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N1 [label="Child Protection Policies" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N2 [label="Social Skill Development" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N3 [label="Special Needs Accommodation" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N4 [label="Emotional Support" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N5 [label="Safety Supervision" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N6 [label="After_School Programs" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N7 [label="Learning Material Selection" color="#FFF176" fillcolor="#FFFDE7" shape=oval style=filled]
+	N8 [label="Sensory Play" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N9 [label="Curriculum Planning" color="#FFF9AE" fillcolor="#FFFCE6" shape=folder style=filled]
+	N10 [label="Nap Time Supervision" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N11 [label="Daily Activity Reporting" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N12 [label="Story Time Reading" color="#FFF9AE" fillcolor="#FFFCE6" shape=plaintext style=filled]
+	N13 [label="Diaper Changing" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	S0 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Field Trip Organization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Individualized Attention" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest0_1 [label="Child Development Assessment" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+		nest0_2 [label="Infant Care" color="#FFF9AE" fillcolor="#FFFCE6" shape=parallelogram style=filled]
+		nest0_3 [label="Toddler Activities" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Childcare Facility Licensing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Parent Communication" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest1_1 [label="Early Literacy Programs" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+		nest1_2 [label="Music and Movement Activities" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+		nest1_3 [label="Child Psychology Application" color="#AB47BC" fillcolor="#F3E5F5" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [label=complies color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest0_0 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N4 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest1_0 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N9 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_14.dot b/test/graphviz/graph_hard/graphviz_14.dot
new file mode 100644
index 0000000000000000000000000000000000000000..df666f7fa9b3374b9227b06233947dcc90c4e388
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_14.dot
@@ -0,0 +1,54 @@
+digraph {
+	rankdir=LR
+	N0 [label="Warehouse Management" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N1 [label="Customer Review" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N2 [label="Refund Process" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N3 [label="Loyalty Points" color="#FFF8A6" fillcolor="#FFFDE0" shape=Mdiamond style=filled]
+	N4 [label="Affiliate Marketing" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N5 [label="Price Adjustment" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N6 [label="Cart Abandonment" color="#90A4AE" fillcolor="#ECEFF1" shape=oval style=filled]
+	N7 [label="Invoice Generation" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S2 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Subscription Service" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Delivery Rescheduling" color="#FFF8A6" fillcolor="#FFFDE0" shape=oval style=filled]
+		nest0_1 [label=Payment color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+		nest0_2 [label="Live Chat Support" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest0_3 [label="Search Engine Optimization" color="#90A4AE" fillcolor="#ECEFF1" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [label=notifies color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="A or B Testing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Product Listing" color="#4DB6AC" fillcolor="#E0F2F1" shape=folder style=filled]
+		nest1_1 [label="Wishlist Management" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+		nest1_2 [label="Product Recommendation" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=reviews color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=secures color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S2 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [label=routes color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	M2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N6 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N6 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_14.txt b/test/graphviz/graph_hard/graphviz_14.txt
new file mode 100644
index 0000000000000000000000000000000000000000..87b52c9cd4e21af3c62f89105447a66a1f01614f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_14.txt
@@ -0,0 +1,31 @@
+<Affiliate Marketing, connectedTo, Cart Abandonment>
+<Affiliate Marketing, connectedTo, Delivery Rescheduling>
+<Affiliate Marketing, connectedTo, Invoice Generation>
+<Affiliate Marketing, connectedTo, Product Listing>
+<Affiliate Marketing, secures, Price Adjustment>
+<Cart Abandonment, connectedTo, Invoice Generation>
+<Cart Abandonment, connectedTo, Loyalty Points>
+<Customer Review, reviews, Refund Process>
+<Delivery Rescheduling, notifies, Payment>
+<Delivery Rescheduling, partOf, Delivery Rescheduling>
+<Live Chat Support, connectedTo, Search Engine Optimization>
+<Live Chat Support, partOf, Live Chat Support>
+<Loyalty Points, connectedTo, Affiliate Marketing>
+<Loyalty Points, routes, Cart Abandonment>
+<Payment, connectedTo, Live Chat Support>
+<Payment, partOf, Payment>
+<Price Adjustment, connectedTo, Cart Abandonment>
+<Product Listing, connectedTo, Wishlist Management>
+<Product Listing, partOf, Product Listing>
+<Product Recommendation, connectedTo, Cart Abandonment>
+<Product Recommendation, connectedTo, Loyalty Points>
+<Product Recommendation, connectedTo, Wishlist Management>
+<Product Recommendation, partOf, Product Recommendation>
+<Refund Process, connectedTo, Cart Abandonment>
+<Refund Process, connectedTo, Loyalty Points>
+<Search Engine Optimization, connectedTo, Customer Review>
+<Search Engine Optimization, partOf, Search Engine Optimization>
+<Warehouse Management, connectedTo, Cart Abandonment>
+<Warehouse Management, connectedTo, Customer Review>
+<Wishlist Management, connectedTo, Product Recommendation>
+<Wishlist Management, partOf, Wishlist Management>
diff --git a/test/graphviz/graph_hard/graphviz_140.dot b/test/graphviz/graph_hard/graphviz_140.dot
new file mode 100644
index 0000000000000000000000000000000000000000..36f6220784c16436408a0e8cae0af1af0ec4f46c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_140.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=BT
+	N0 [label="Learning Material Selection" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N1 [label="Sensory Play" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N2 [label="Creative Arts Activities" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N3 [label="Child Psychology Application" color="#C0CA33" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N4 [label="Emergency Evacuation Drills" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N5 [label="Emotional Support" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N6 [label="First Aid Administration" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N7 [label="Child Protection Policies" color="#FFB2A5" fillcolor="#FFDCD6" shape=Mdiamond style=filled]
+	N8 [label="Curriculum Planning" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N9 [label="Staff Training and Certification" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	S0 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Group Activities Coordination" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Story Time Reading" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+		nest0_1 [label="Motor Skill Development" color="#5C6BC0" fillcolor="#E8EAF6" shape=diamond style=filled]
+		nest0_2 [label="Outdoor Play Supervision" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Field Trip Organization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Social Skill Development" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+		nest1_1 [label="Playground Safety Inspection" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+		nest1_2 [label="Music and Movement Activities" color="#FFB2A5" fillcolor="#FFDCD6" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=organizes color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N3 [label=advises color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N6 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S2 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [label=educates color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [label=documents color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_141.dot b/test/graphviz/graph_hard/graphviz_141.dot
new file mode 100644
index 0000000000000000000000000000000000000000..312586db79dbb8e50a755d9cd60ff78789de672d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_141.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=LR
+	N0 [label="Motor Skill Development" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N1 [label="Nap Time Supervision" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N2 [label="Field Trip Organization" color="#B0C5CD" fillcolor="#DFE7EB" shape=octagon style=filled]
+	N3 [label="After_School Programs" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N4 [label="Hygiene Practices" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N5 [label="Music and Movement Activities" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N6 [label="Nutritional Meal Preparation" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N7 [label="Learning Material Selection" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N8 [label="Childcare Facility Licensing" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N9 [label="Toddler Activities" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+	N10 [label="Daily Activity Reporting" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N11 [label="Teacher_Child Ratio Management" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N12 [label="Story Time Reading" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N13 [label="Diaper Changing" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N14 [label="Child Psychology Application" color="#B0C5CD" fillcolor="#DFE7EB" shape=oval style=filled]
+	N15 [label="Playground Safety Inspection" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	S0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Social Skill Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Creative Arts Activities" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+		nest0_1 [label="Early Literacy Programs" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+		nest0_2 [label="Special Needs Accommodation" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Group Activities Coordination" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Parent Communication" color="#B0C5CD" fillcolor="#DFE7EB" shape=diamond style=filled]
+		nest1_1 [label="Outdoor Exploration" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=certifies color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=educates color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest0_0 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N14 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [label=trains color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	M1 -> N11 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N6 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_141.txt b/test/graphviz/graph_hard/graphviz_141.txt
new file mode 100644
index 0000000000000000000000000000000000000000..360dc374c7c8aa9065826da7ea8610b7f14b4042
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_141.txt
@@ -0,0 +1,36 @@
+<After_School Programs, connectedTo, Childcare Facility Licensing>
+<After_School Programs, connectedTo, Hygiene Practices>
+<After_School Programs, connectedTo, Teacher_Child Ratio Management>
+<Child Psychology Application, connectedTo, Playground Safety Inspection>
+<Childcare Facility Licensing, connectedTo, Toddler Activities>
+<Creative Arts Activities, connectedTo, Early Literacy Programs>
+<Creative Arts Activities, partOf, Creative Arts Activities>
+<Daily Activity Reporting, educates, Teacher_Child Ratio Management>
+<Diaper Changing, connectedTo, Child Psychology Application>
+<Early Literacy Programs, connectedTo, Special Needs Accommodation>
+<Early Literacy Programs, partOf, Early Literacy Programs>
+<Field Trip Organization, certifies, After_School Programs>
+<Hygiene Practices, connectedTo, Music and Movement Activities>
+<Learning Material Selection, connectedTo, Childcare Facility Licensing>
+<Learning Material Selection, connectedTo, Diaper Changing>
+<Learning Material Selection, connectedTo, Teacher_Child Ratio Management>
+<Learning Material Selection, trains, Toddler Activities>
+<Motor Skill Development, connectedTo, Daily Activity Reporting>
+<Motor Skill Development, connectedTo, Learning Material Selection>
+<Motor Skill Development, connectedTo, Nap Time Supervision>
+<Motor Skill Development, connectedTo, Teacher_Child Ratio Management>
+<Music and Movement Activities, connectedTo, Nutritional Meal Preparation>
+<Nap Time Supervision, connectedTo, Field Trip Organization>
+<Nutritional Meal Preparation, connectedTo, Childcare Facility Licensing>
+<Nutritional Meal Preparation, connectedTo, Learning Material Selection>
+<Outdoor Exploration, connectedTo, Child Psychology Application>
+<Outdoor Exploration, partOf, Outdoor Exploration>
+<Parent Communication, connectedTo, Outdoor Exploration>
+<Parent Communication, partOf, Parent Communication>
+<Special Needs Accommodation, connectedTo, Learning Material Selection>
+<Special Needs Accommodation, partOf, Special Needs Accommodation>
+<Story Time Reading, connectedTo, Diaper Changing>
+<Teacher_Child Ratio Management, connectedTo, Creative Arts Activities>
+<Teacher_Child Ratio Management, connectedTo, Story Time Reading>
+<Toddler Activities, connectedTo, Daily Activity Reporting>
+<Toddler Activities, connectedTo, Parent Communication>
diff --git a/test/graphviz/graph_hard/graphviz_142.dot b/test/graphviz/graph_hard/graphviz_142.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4febc49ed668ca55746856b9bf86c258a36b8e7b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_142.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=RL
+	N0 [label="Recreational Activities Planning" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N1 [label="Financial Management Assistance" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N2 [label="Long_Term Care Planning" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N3 [label="Elder Abuse Prevention" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N4 [label="Meal Preparation" color="#FFE69C" fillcolor="#FFF9D4" shape=diamond style=filled]
+	N5 [label="Emergency Response System Monitoring" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N6 [label="Transportation Assistance" color="#FFE69C" fillcolor="#FFF9D4" shape=folder style=filled]
+	N7 [label="Hospice Care Coordination" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N8 [label="Smart Home Integration for Seniors" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N9 [label="Respite Care" color="#FFCC7A" fillcolor="#FFF6D9" shape=parallelogram style=filled]
+	N10 [label="Palliative Care" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N11 [label="Community Resource Connection" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N12 [label="Personal Care Assistance" color="#FFE69C" fillcolor="#FFF9D4" shape=Mdiamond style=filled]
+	N13 [label="Home Health Aide Services" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N14 [label="Family Communication" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N15 [label="Fall Prevention" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N16 [label=Companionship color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N17 [label="Social Engagement Activities" color="#FFE69C" fillcolor="#FFF9D4" shape=folder style=filled]
+	N18 [label="Safety Assessments" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	S0 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Emotional Support and Counseling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Legal Aid Referrals" color="#9575CD" fillcolor="#EDE7F6" shape=Mdiamond style=filled]
+		nest0_1 [label="Daily Living Assistance" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Rehabilitation Support" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Memory Care" color="#FFE69C" fillcolor="#FFF9D4" shape=plaintext style=filled]
+		nest1_1 [label="Care Plan Development" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N14 -> nest0_0 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N8 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N13 -> S0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N18 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N17 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N14 -> S1 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S2 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N18 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N11 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_142.txt b/test/graphviz/graph_hard/graphviz_142.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c5bacd80e2ad7f8480b95d48205bb6c6212bd0ae
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_142.txt
@@ -0,0 +1,39 @@
+<Care Plan Development, connectedTo, Smart Home Integration for Seniors>
+<Care Plan Development, partOf, Care Plan Development>
+<Community Resource Connection, connectedTo, Personal Care Assistance>
+<Companionship, connectedTo, Social Engagement Activities>
+<Daily Living Assistance, connectedTo, Social Engagement Activities>
+<Daily Living Assistance, partOf, Daily Living Assistance>
+<Elder Abuse Prevention, connectedTo, Community Resource Connection>
+<Elder Abuse Prevention, connectedTo, Meal Preparation>
+<Emergency Response System Monitoring, connectedTo, Safety Assessments>
+<Emergency Response System Monitoring, connectedTo, Social Engagement Activities>
+<Emergency Response System Monitoring, connectedTo, Transportation Assistance>
+<Fall Prevention, connectedTo, Companionship>
+<Family Communication, connectedTo, Companionship>
+<Family Communication, connectedTo, Fall Prevention>
+<Family Communication, connectedTo, Legal Aid Referrals>
+<Family Communication, connectedTo, Safety Assessments>
+<Family Communication, connectedTo, Social Engagement Activities>
+<Financial Management Assistance, connectedTo, Community Resource Connection>
+<Financial Management Assistance, connectedTo, Emergency Response System Monitoring>
+<Financial Management Assistance, connectedTo, Long_Term Care Planning>
+<Home Health Aide Services, connectedTo, Family Communication>
+<Home Health Aide Services, connectedTo, Safety Assessments>
+<Home Health Aide Services, connectedTo, Social Engagement Activities>
+<Hospice Care Coordination, connectedTo, Smart Home Integration for Seniors>
+<Legal Aid Referrals, connectedTo, Daily Living Assistance>
+<Legal Aid Referrals, partOf, Legal Aid Referrals>
+<Long_Term Care Planning, connectedTo, Elder Abuse Prevention>
+<Meal Preparation, connectedTo, Emergency Response System Monitoring>
+<Memory Care, connectedTo, Care Plan Development>
+<Memory Care, partOf, Memory Care>
+<Palliative Care, connectedTo, Community Resource Connection>
+<Personal Care Assistance, connectedTo, Home Health Aide Services>
+<Recreational Activities Planning, connectedTo, Emergency Response System Monitoring>
+<Recreational Activities Planning, connectedTo, Financial Management Assistance>
+<Respite Care, connectedTo, Palliative Care>
+<Smart Home Integration for Seniors, connectedTo, Respite Care>
+<Social Engagement Activities, connectedTo, Safety Assessments>
+<Transportation Assistance, connectedTo, Hospice Care Coordination>
+<Transportation Assistance, connectedTo, Memory Care>
diff --git a/test/graphviz/graph_hard/graphviz_144.dot b/test/graphviz/graph_hard/graphviz_144.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cd15d29e1cf3f19256fcf4d786801d8dec5d7dd8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_144.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=LR
+	N0 [label="Long_Term Care Planning" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Nursing Care" color="#5C6BC0" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	N2 [label=Companionship color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N3 [label="Health Monitoring" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N4 [label="Memory Care" color="#A188D0" fillcolor="#DACBE3" shape=oval style=filled]
+	N5 [label="Telehealth for Seniors" color="#5C6BC0" fillcolor="#E8EAF6" shape=octagon style=filled]
+	N6 [label="Palliative Care" color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+	N7 [label="Meal Preparation" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N8 [label="Hospice Care Coordination" color="#A188D0" fillcolor="#DACBE3" shape=parallelogram style=filled]
+	N9 [label="Daily Living Assistance" color="#BCB88A" fillcolor="#F5F5DC" shape=folder style=filled]
+	N10 [label="Rehabilitation Support" color="#BCB88A" fillcolor="#F5F5DC" shape=oval style=filled]
+	N11 [label="Mobility Support" color="#5C6BC0" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N12 [label="Speech Therapy" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N13 [label="Incontinence Care" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N14 [label="Care Plan Development" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N15 [label="Physical Therapy" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N16 [label="Smart Home Integration for Seniors" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N17 [label="Caregiver Training" color="#A188D0" fillcolor="#DACBE3" shape=octagon style=filled]
+	N18 [label="Respite Care" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	S0 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Home Health Aide Services" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Chronic Disease Management" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+		nest0_1 [label="Medication Management" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Legal Aid Referrals" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Financial Management Assistance" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+		nest1_1 [label="Community Resource Connection" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=monitors color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N16 [label=plans color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N4 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N14 -> S0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N18 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N17 [label=coordinates color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [label=manages color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N11 -> S2 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N15 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N16 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N4 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_144.txt b/test/graphviz/graph_hard/graphviz_144.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d754ef48e347a404117a1e108eb3bc7d0e7401fd
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_144.txt
@@ -0,0 +1,41 @@
+<Care Plan Development, connectedTo, Physical Therapy>
+<Care Plan Development, connectedTo, Respite Care>
+<Care Plan Development, connectedTo, Smart Home Integration for Seniors>
+<Care Plan Development, coordinates, Caregiver Training>
+<Caregiver Training, connectedTo, Respite Care>
+<Chronic Disease Management, connectedTo, Medication Management>
+<Chronic Disease Management, partOf, Chronic Disease Management>
+<Community Resource Connection, connectedTo, Memory Care>
+<Community Resource Connection, partOf, Community Resource Connection>
+<Companionship, connectedTo, Health Monitoring>
+<Daily Living Assistance, connectedTo, Rehabilitation Support>
+<Financial Management Assistance, connectedTo, Community Resource Connection>
+<Financial Management Assistance, partOf, Financial Management Assistance>
+<Health Monitoring, connectedTo, Memory Care>
+<Health Monitoring, connectedTo, Palliative Care>
+<Hospice Care Coordination, connectedTo, Daily Living Assistance>
+<Incontinence Care, connectedTo, Care Plan Development>
+<Long_Term Care Planning, connectedTo, Memory Care>
+<Long_Term Care Planning, connectedTo, Nursing Care>
+<Meal Preparation, connectedTo, Hospice Care Coordination>
+<Medication Management, partOf, Medication Management>
+<Medication Management, plans, Smart Home Integration for Seniors>
+<Memory Care, connectedTo, Palliative Care>
+<Memory Care, monitors, Telehealth for Seniors>
+<Mobility Support, connectedTo, Care Plan Development>
+<Mobility Support, connectedTo, Caregiver Training>
+<Mobility Support, connectedTo, Physical Therapy>
+<Mobility Support, connectedTo, Smart Home Integration for Seniors>
+<Mobility Support, connectedTo, Speech Therapy>
+<Nursing Care, connectedTo, Companionship>
+<Nursing Care, connectedTo, Memory Care>
+<Palliative Care, connectedTo, Meal Preparation>
+<Physical Therapy, connectedTo, Smart Home Integration for Seniors>
+<Rehabilitation Support, connectedTo, Financial Management Assistance>
+<Rehabilitation Support, connectedTo, Mobility Support>
+<Smart Home Integration for Seniors, connectedTo, Caregiver Training>
+<Speech Therapy, connectedTo, Care Plan Development>
+<Speech Therapy, connectedTo, Incontinence Care>
+<Speech Therapy, manages, Smart Home Integration for Seniors>
+<Telehealth for Seniors, connectedTo, Chronic Disease Management>
+<Telehealth for Seniors, connectedTo, Palliative Care>
diff --git a/test/graphviz/graph_hard/graphviz_145.dot b/test/graphviz/graph_hard/graphviz_145.dot
new file mode 100644
index 0000000000000000000000000000000000000000..97b96a06c2ac63d05a107939439f0ef020d2bd7e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_145.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=TD
+	N0 [label="Search and Rescue Operations" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N1 [label="Shelter Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=hexagon style=filled]
+	N2 [label="Resource Mobilization" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N3 [label="Drone Deployment for Assessment" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N4 [label="Psychosocial Support" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N5 [label="Capacity Building for Local Communities" color="#CD8FF2" fillcolor="#ECCFF5" shape=hexagon style=filled]
+	N6 [label="Post_Disaster Evaluation" color="#FFB2A5" fillcolor="#FFDCD6" shape=folder style=filled]
+	N7 [label="International Aid Coordination" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N8 [label="Incident Command System" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N9 [label="Medical Aid Deployment" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N10 [label="Resilience Building" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N11 [label="Emergency Response" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+	N12 [label="Geographic Information Systems for Disasters" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+	N13 [label="Infrastructure Repair" color="#CD8FF2" fillcolor="#ECCFF5" shape=octagon style=filled]
+	N14 [label="Evacuation Procedures" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	S0 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Vulnerability Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Emergency Drills and Exercises" color="#FFB2A5" fillcolor="#FFDCD6" shape=oval style=filled]
+		nest0_1 [label="Policy and Legislation Review" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+		nest0_2 [label="Hazard Identification" color="#FFB2A5" fillcolor="#FFDCD6" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Early Warning Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Communication Protocols" color="#FFB2A5" fillcolor="#FFDCD6" shape=octagon style=filled]
+		nest1_1 [label="Hazard Mapping" color="#DCE775" fillcolor="#FCFCE7" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [label=rebuilds color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N13 -> nest0_0 [label=prevents color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N14 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest1_0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N2 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N10 -> S0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [label=locates color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_145.txt b/test/graphviz/graph_hard/graphviz_145.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a42b6eda4c7f441dea620e3ad00aa33721e9f521
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_145.txt
@@ -0,0 +1,39 @@
+<Capacity Building for Local Communities, connectedTo, Post_Disaster Evaluation>
+<Communication Protocols, partOf, Communication Protocols>
+<Communication Protocols, rebuilds, Hazard Mapping>
+<Drone Deployment for Assessment, connectedTo, Capacity Building for Local Communities>
+<Drone Deployment for Assessment, connectedTo, Emergency Response>
+<Drone Deployment for Assessment, connectedTo, Incident Command System>
+<Drone Deployment for Assessment, connectedTo, Post_Disaster Evaluation>
+<Drone Deployment for Assessment, connectedTo, Psychosocial Support>
+<Drone Deployment for Assessment, connectedTo, Resilience Building>
+<Drone Deployment for Assessment, locates, Capacity Building for Local Communities>
+<Emergency Drills and Exercises, connectedTo, Policy and Legislation Review>
+<Emergency Drills and Exercises, partOf, Emergency Drills and Exercises>
+<Emergency Response, connectedTo, Geographic Information Systems for Disasters>
+<Geographic Information Systems for Disasters, connectedTo, Infrastructure Repair>
+<Hazard Identification, connectedTo, Evacuation Procedures>
+<Hazard Identification, partOf, Hazard Identification>
+<Hazard Mapping, connectedTo, Resource Mobilization>
+<Hazard Mapping, partOf, Hazard Mapping>
+<Incident Command System, connectedTo, Medical Aid Deployment>
+<Infrastructure Repair, connectedTo, Evacuation Procedures>
+<Infrastructure Repair, prevents, Emergency Drills and Exercises>
+<International Aid Coordination, connectedTo, Emergency Response>
+<International Aid Coordination, connectedTo, Incident Command System>
+<Medical Aid Deployment, connectedTo, Resilience Building>
+<Policy and Legislation Review, connectedTo, Hazard Identification>
+<Policy and Legislation Review, partOf, Policy and Legislation Review>
+<Post_Disaster Evaluation, connectedTo, Emergency Response>
+<Post_Disaster Evaluation, connectedTo, International Aid Coordination>
+<Psychosocial Support, connectedTo, Capacity Building for Local Communities>
+<Resilience Building, connectedTo, Emergency Response>
+<Resilience Building, connectedTo, Evacuation Procedures>
+<Resilience Building, connectedTo, Geographic Information Systems for Disasters>
+<Resilience Building, connectedTo, Infrastructure Repair>
+<Resource Mobilization, connectedTo, Capacity Building for Local Communities>
+<Resource Mobilization, connectedTo, Drone Deployment for Assessment>
+<Search and Rescue Operations, connectedTo, Capacity Building for Local Communities>
+<Search and Rescue Operations, connectedTo, Shelter Management>
+<Shelter Management, connectedTo, Communication Protocols>
+<Shelter Management, connectedTo, Resource Mobilization>
diff --git a/test/graphviz/graph_hard/graphviz_146.dot b/test/graphviz/graph_hard/graphviz_146.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a3b41c403c2f2bb347d5eac84a334a2748229ef4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_146.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=LR
+	N0 [label="Emergency Response" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N1 [label="Geographic Information Systems for Disasters" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N2 [label="Environmental Remediation" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N3 [label="Vulnerability Analysis" color="#7E57C2" fillcolor="#EDE7F6" shape=folder style=filled]
+	N4 [label="Hazard Mapping" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N5 [label="Policy and Legislation Review" color="#C2B2F0" fillcolor="#EFE6FF" shape=octagon style=filled]
+	N6 [label="Medical Aid Deployment" color="#7E57C2" fillcolor="#EDE7F6" shape=plaintext style=filled]
+	N7 [label="International Aid Coordination" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N8 [label="Debris Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N9 [label="Volunteer Coordination" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N10 [label="Infrastructure Repair" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Hazard Identification" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cash Transfer Programs" color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+		nest0_1 [label="Drone Deployment for Assessment" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Search and Rescue Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Mitigation Strategies" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest1_1 [label="Recovery Planning" color="#9FA9E1" fillcolor="#D6D9F0" shape=folder style=filled]
+		nest1_2 [label="Resource Mobilization" color="#7E57C2" fillcolor="#EDE7F6" shape=plaintext style=filled]
+		nest1_3 [label="Damage Assessment" color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N2 [label=evaluates color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [label=assesses color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N7 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [label=reconstructs color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_147.dot b/test/graphviz/graph_hard/graphviz_147.dot
new file mode 100644
index 0000000000000000000000000000000000000000..25bad188a671497dde73a3870cae8af227f75e76
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_147.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=TD
+	N0 [label="Incident Command System" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N1 [label="Vulnerability Analysis" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N2 [label="Capacity Building for Local Communities" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N3 [label="Climate Change Adaptation for Disasters" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N4 [label="Communication Protocols" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N5 [label="Policy and Legislation Review" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N6 [label="Environmental Remediation" color="#FFE470" fillcolor="#FFFAE0" shape=parallelogram style=filled]
+	N7 [label="Geographic Information Systems for Disasters" color="#BDBDBD" fillcolor="#F5F5F5" shape=Mdiamond style=filled]
+	N8 [label="Hazard Mapping" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N9 [label="Resource Mobilization" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	S0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Emergency Response" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Early Warning Systems" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest0_1 [label="Medical Aid Deployment" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+		nest0_2 [label="Emergency Drills and Exercises" color="#FFE470" fillcolor="#FFFAE0" shape=oval style=filled]
+		nest0_3 [label="Infrastructure Repair" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [label=secures color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Debris Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Psychosocial Support" color="#4DB6AC" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+		nest1_1 [label="Mitigation Strategies" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=alerts color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=mobilizes color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=trains color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N2 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N9 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N3 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N5 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_148.dot b/test/graphviz/graph_hard/graphviz_148.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6df2ead201be1c19fa0d99335f3430b290674977
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_148.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=RL
+	N0 [label="Naval Operations" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N1 [label=Targeting color="#3F51B5" fillcolor="#C5CAE9" shape=folder style=filled]
+	N2 [label="Equipment Maintenance" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N3 [label="Ground Operations" color="#E57373" fillcolor="#FFEBEE" shape=diamond style=filled]
+	N4 [label="Joint Exercises" color="#388E3C" fillcolor="#F1F8E9" shape=oval style=filled]
+	N5 [label=Demobilization color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N6 [label="Rules of Engagement" color="#E57373" fillcolor="#FFEBEE" shape=Mdiamond style=filled]
+	N7 [label="Operations Planning" color="#3F51B5" fillcolor="#C5CAE9" shape=oval style=filled]
+	N8 [label="Intelligence Gathering" color="#3F51B5" fillcolor="#C5CAE9" shape=folder style=filled]
+	N9 [label="Air Operations" color="#388E3C" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N10 [label="Force Projection" color="#3F51B5" fillcolor="#C5CAE9" shape=diamond style=filled]
+	N11 [label="Combat Operations" color="#3F51B5" fillcolor="#C5CAE9" shape=plaintext style=filled]
+	N12 [label="Readiness Assessment" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	S0 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Military Strategy Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Counter_Terrorism Operations" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+		nest0_1 [label="Counter_Insurgency Operations" color="#3F51B5" fillcolor="#C5CAE9" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Military Law" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Specialized Training" color="#E57373" fillcolor="#FFEBEE" shape=parallelogram style=filled]
+		nest1_1 [label="Supply Chain Management" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+		nest1_2 [label="Civil_Military Cooperation" color="#E57373" fillcolor="#FFEBEE" shape=octagon style=filled]
+		nest1_3 [label="Space Operations" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=attacks color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N8 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N5 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S2 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M2 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N12 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_148.txt b/test/graphviz/graph_hard/graphviz_148.txt
new file mode 100644
index 0000000000000000000000000000000000000000..08cb2fd5b00698adcc43e21409d7852273ee3a62
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_148.txt
@@ -0,0 +1,35 @@
+<Air Operations, connectedTo, Force Projection>
+<Civil_Military Cooperation, connectedTo, Space Operations>
+<Civil_Military Cooperation, partOf, Civil_Military Cooperation>
+<Combat Operations, connectedTo, Readiness Assessment>
+<Counter_Insurgency Operations, connectedTo, Intelligence Gathering>
+<Counter_Insurgency Operations, partOf, Counter_Insurgency Operations>
+<Counter_Terrorism Operations, connectedTo, Counter_Insurgency Operations>
+<Counter_Terrorism Operations, partOf, Counter_Terrorism Operations>
+<Demobilization, connectedTo, Air Operations>
+<Demobilization, connectedTo, Counter_Terrorism Operations>
+<Demobilization, connectedTo, Operations Planning>
+<Demobilization, connectedTo, Rules of Engagement>
+<Equipment Maintenance, connectedTo, Ground Operations>
+<Force Projection, connectedTo, Combat Operations>
+<Ground Operations, connectedTo, Joint Exercises>
+<Ground Operations, connectedTo, Readiness Assessment>
+<Intelligence Gathering, connectedTo, Air Operations>
+<Intelligence Gathering, connectedTo, Specialized Training>
+<Joint Exercises, connectedTo, Demobilization>
+<Joint Exercises, connectedTo, Operations Planning>
+<Naval Operations, attacks, Targeting>
+<Naval Operations, connectedTo, Demobilization>
+<Naval Operations, connectedTo, Force Projection>
+<Naval Operations, connectedTo, Readiness Assessment>
+<Operations Planning, connectedTo, Intelligence Gathering>
+<Operations Planning, connectedTo, Readiness Assessment>
+<Rules of Engagement, connectedTo, Operations Planning>
+<Space Operations, connectedTo, Demobilization>
+<Space Operations, partOf, Space Operations>
+<Specialized Training, connectedTo, Supply Chain Management>
+<Specialized Training, partOf, Specialized Training>
+<Supply Chain Management, connectedTo, Civil_Military Cooperation>
+<Supply Chain Management, partOf, Supply Chain Management>
+<Targeting, connectedTo, Equipment Maintenance>
+<Targeting, connectedTo, Operations Planning>
diff --git a/test/graphviz/graph_hard/graphviz_149.dot b/test/graphviz/graph_hard/graphviz_149.dot
new file mode 100644
index 0000000000000000000000000000000000000000..de8c8c9023b0cec20ebd5dd5b0610be0b5ce1af5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_149.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=TD
+	N0 [label="Military Law" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N1 [label="Rules of Engagement" color="#A1887F" fillcolor="#EFEBE9" shape=parallelogram style=filled]
+	N2 [label="Cyber Warfare Operations" color="#A1887F" fillcolor="#EFEBE9" shape=oval style=filled]
+	N3 [label="Logistics Support" color="#A1887F" fillcolor="#EFEBE9" shape=plaintext style=filled]
+	N4 [label="Chaplain Services" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N5 [label="Unmanned Systems Operation" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+	N6 [label="Counter_Terrorism Operations" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N7 [label="Crisis Management" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N8 [label=Reconnaissance color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N9 [label="Family Support Programs" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N10 [label="Naval Operations" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N11 [label="Counter_Insurgency Operations" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N12 [label="Medical Support" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N13 [label="Air Operations" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N14 [label=Recruitment color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N15 [label=Demobilization color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N16 [label="Space Operations" color="#FF9800" fillcolor="#FFE0B2" shape=parallelogram style=filled]
+	N17 [label="Troop Deployment" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S0 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Force Projection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Surveillance color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+		nest0_1 [label="Joint Exercises" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_0 -> nest0_1 [label=researches color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Defense Procurement" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Civil_Military Cooperation" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest1_1 [label="Specialized Training" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+		nest1_2 [label="Equipment Maintenance" color="#FF9800" fillcolor="#FFE0B2" shape=plaintext style=filled]
+		nest1_3 [label="Military Strategy Development" color="#FFA726" fillcolor="#FFF3E0" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=maps color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=communicates color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=enforces color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N6 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest1_0 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N14 [label=mediates color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N11 -> S0 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N16 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_149.txt b/test/graphviz/graph_hard/graphviz_149.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1aa5b80be6c6bc9c95cd467d7543776707e099a6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_149.txt
@@ -0,0 +1,39 @@
+<Air Operations, connectedTo, Recruitment>
+<Air Operations, connectedTo, Space Operations>
+<Air Operations, connectedTo, Troop Deployment>
+<Chaplain Services, communicates, Unmanned Systems Operation>
+<Chaplain Services, connectedTo, Surveillance>
+<Civil_Military Cooperation, connectedTo, Specialized Training>
+<Civil_Military Cooperation, partOf, Civil_Military Cooperation>
+<Counter_Insurgency Operations, connectedTo, Air Operations>
+<Counter_Insurgency Operations, connectedTo, Civil_Military Cooperation>
+<Counter_Insurgency Operations, connectedTo, Medical Support>
+<Counter_Insurgency Operations, connectedTo, Recruitment>
+<Counter_Terrorism Operations, enforces, Crisis Management>
+<Crisis Management, connectedTo, Reconnaissance>
+<Cyber Warfare Operations, connectedTo, Chaplain Services>
+<Cyber Warfare Operations, connectedTo, Logistics Support>
+<Demobilization, connectedTo, Space Operations>
+<Equipment Maintenance, connectedTo, Military Strategy Development>
+<Equipment Maintenance, partOf, Equipment Maintenance>
+<Family Support Programs, connectedTo, Naval Operations>
+<Joint Exercises, connectedTo, Counter_Terrorism Operations>
+<Joint Exercises, partOf, Joint Exercises>
+<Logistics Support, connectedTo, Chaplain Services>
+<Medical Support, connectedTo, Air Operations>
+<Military Law, connectedTo, Rules of Engagement>
+<Military Strategy Development, mediates, Recruitment>
+<Military Strategy Development, partOf, Military Strategy Development>
+<Naval Operations, connectedTo, Counter_Insurgency Operations>
+<Reconnaissance, connectedTo, Family Support Programs>
+<Recruitment, connectedTo, Demobilization>
+<Recruitment, connectedTo, Space Operations>
+<Recruitment, connectedTo, Troop Deployment>
+<Rules of Engagement, connectedTo, Chaplain Services>
+<Rules of Engagement, maps, Cyber Warfare Operations>
+<Space Operations, connectedTo, Troop Deployment>
+<Specialized Training, connectedTo, Equipment Maintenance>
+<Specialized Training, partOf, Specialized Training>
+<Surveillance, partOf, Surveillance>
+<Surveillance, researches, Joint Exercises>
+<Unmanned Systems Operation, connectedTo, Counter_Terrorism Operations>
diff --git a/test/graphviz/graph_hard/graphviz_15.dot b/test/graphviz/graph_hard/graphviz_15.dot
new file mode 100644
index 0000000000000000000000000000000000000000..81b925d3f15e0e523ff4a249948b06ccd8151884
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_15.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=RL
+	N0 [label="Cart Abandonment" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N1 [label="Add to Cart" color="#94C0C0" fillcolor="#CADEDE" shape=octagon style=filled]
+	N2 [label="Customer Review" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N3 [label="Promotion Application" color="#9575CD" fillcolor="#EDE7F6" shape=diamond style=filled]
+	N4 [label="A or B Testing" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N5 [label=Payment color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+	N6 [label="Cross_selling Recommendation" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+	N7 [label="Customer Inquiry" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N8 [label="Search Engine Optimization" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N9 [label="Social Media Integration" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N10 [label="Supplier Onboarding" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N11 [label="Payment Gateway Reconciliation" color="#9575CD" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	N12 [label="Marketing Campaign Launch" color="#9575CD" fillcolor="#EDE7F6" shape=Mdiamond style=filled]
+	N13 [label="Affiliate Marketing" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+	N14 [label="Gift Card Purchase" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N15 [label="Product Listing" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N16 [label="Package Return" color="#FF8A65" fillcolor="#FBE9E7" shape=folder style=filled]
+	N17 [label="User Account Management" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	S0 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Warehouse Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Fraud Detection" color="#94C0C0" fillcolor="#CADEDE" shape=octagon style=filled]
+		nest0_1 [label="Refund Process" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Up_selling Offer" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Loyalty Points" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+		nest1_1 [label="Mobile App Interaction" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N4 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N11 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N11 -> S0 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N17 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N11 -> S1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_15.txt b/test/graphviz/graph_hard/graphviz_15.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e7a467e05c729ef880b64cad6613e889cdc16111
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_15.txt
@@ -0,0 +1,33 @@
+<A or B Testing, connectedTo, Payment>
+<Add to Cart, connectedTo, Customer Review>
+<Add to Cart, connectedTo, Promotion Application>
+<Affiliate Marketing, connectedTo, Gift Card Purchase>
+<Cart Abandonment, connectedTo, Add to Cart>
+<Cart Abandonment, connectedTo, Promotion Application>
+<Cross_selling Recommendation, connectedTo, Customer Inquiry>
+<Customer Inquiry, connectedTo, Search Engine Optimization>
+<Customer Review, connectedTo, Loyalty Points>
+<Customer Review, connectedTo, Promotion Application>
+<Fraud Detection, connectedTo, Refund Process>
+<Fraud Detection, partOf, Fraud Detection>
+<Gift Card Purchase, connectedTo, Product Listing>
+<Loyalty Points, connectedTo, Mobile App Interaction>
+<Loyalty Points, partOf, Loyalty Points>
+<Marketing Campaign Launch, connectedTo, Affiliate Marketing>
+<Mobile App Interaction, connectedTo, Payment Gateway Reconciliation>
+<Mobile App Interaction, partOf, Mobile App Interaction>
+<Package Return, connectedTo, User Account Management>
+<Payment, connectedTo, Cross_selling Recommendation>
+<Payment Gateway Reconciliation, connectedTo, Affiliate Marketing>
+<Payment Gateway Reconciliation, connectedTo, Marketing Campaign Launch>
+<Payment Gateway Reconciliation, connectedTo, Package Return>
+<Payment Gateway Reconciliation, connectedTo, Product Listing>
+<Payment Gateway Reconciliation, connectedTo, User Account Management>
+<Product Listing, connectedTo, Package Return>
+<Promotion Application, connectedTo, A or B Testing>
+<Refund Process, connectedTo, A or B Testing>
+<Refund Process, partOf, Refund Process>
+<Search Engine Optimization, connectedTo, Fraud Detection>
+<Search Engine Optimization, connectedTo, Social Media Integration>
+<Social Media Integration, connectedTo, Supplier Onboarding>
+<Supplier Onboarding, connectedTo, Payment Gateway Reconciliation>
diff --git a/test/graphviz/graph_hard/graphviz_150.txt b/test/graphviz/graph_hard/graphviz_150.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bc08bd7655dcfe7c79a032233543e487bfa486c0
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_150.txt
@@ -0,0 +1,43 @@
+<Chaplain Services, connectedTo, Counter_Terrorism Operations>
+<Chaplain Services, connectedTo, Disaster Relief Deployment>
+<Chaplain Services, connectedTo, Troop Deployment>
+<Chaplain Services, develops, Space Operations>
+<Chaplain Services, logistics, Disaster Relief Deployment>
+<Civil_Military Cooperation, connectedTo, Counter_Insurgency Operations>
+<Combat Operations, connectedTo, Demobilization>
+<Combat Operations, partOf, Combat Operations>
+<Counter_Insurgency Operations, connectedTo, Military Law>
+<Counter_Terrorism Operations, connectedTo, Disaster Relief Deployment>
+<Counter_Terrorism Operations, connectedTo, Personnel Management>
+<Counter_Terrorism Operations, connectedTo, Space Operations>
+<Counter_Terrorism Operations, connectedTo, Specialized Training>
+<Counter_Terrorism Operations, connectedTo, Targeting>
+<Counter_Terrorism Operations, connectedTo, Troop Deployment>
+<Defense Procurement, connectedTo, Logistics Support>
+<Defense Procurement, partOf, Defense Procurement>
+<Demobilization, connectedTo, Ground Operations>
+<Demobilization, partOf, Demobilization>
+<Disaster Relief Deployment, operates, Personnel Management>
+<Force Projection, connectedTo, Counter_Terrorism Operations>
+<Force Projection, partOf, Force Projection>
+<Ground Operations, connectedTo, Disaster Relief Deployment>
+<Joint Exercises, surveys, Civil_Military Cooperation>
+<Logistics Support, connectedTo, Combat Operations>
+<Logistics Support, partOf, Logistics Support>
+<Military Law, supplies, Readiness Assessment>
+<Peacekeeping Missions, connectedTo, Weapon Systems Development>
+<Personnel Management, connectedTo, Rules of Engagement>
+<Readiness Assessment, connectedTo, Defense Procurement>
+<Readiness Assessment, connectedTo, Peacekeeping Missions>
+<Rules of Engagement, connectedTo, Specialized Training>
+<Space Operations, connectedTo, Ground Operations>
+<Specialized Training, connectedTo, Joint Exercises>
+<Supply Chain Management, connectedTo, Force Projection>
+<Supply Chain Management, partOf, Supply Chain Management>
+<Surveillance, connectedTo, Disaster Relief Deployment>
+<Surveillance, connectedTo, Military Law>
+<Surveillance, connectedTo, Peacekeeping Missions>
+<Surveillance, connectedTo, Space Operations>
+<Targeting, connectedTo, Supply Chain Management>
+<Targeting, partOf, Targeting>
+<Troop Deployment, connectedTo, Surveillance>
diff --git a/test/graphviz/graph_hard/graphviz_151.dot b/test/graphviz/graph_hard/graphviz_151.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8999755d57ed11e540061362b52e9674abd37b90
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_151.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=RL
+	N0 [label="Emergency Procedures Training" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N1 [label="Flight Simulation" color="#03A9F4" fillcolor="#B3E5FC" shape=Mdiamond style=filled]
+	N2 [label="Flight Planning" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N3 [label="Unmanned Aerial Vehicle Integration" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N4 [label="Cargo Loading" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N5 [label="Crew Resource Management" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N6 [label="Airport Operations" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N7 [label="Pilot Training" color="#9FA9E1" fillcolor="#D6D9F0" shape=oval style=filled]
+	N8 [label="Next_Generation Air Traffic Management" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Passenger Boarding" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Remote Tower Operations" color="#03A9F4" fillcolor="#B3E5FC" shape=octagon style=filled]
+		nest0_1 [label="Aircraft De_icing" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+		nest0_2 [label="Route Optimization" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Navigation System Check" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Airspace Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+		nest1_1 [label="Air Cargo Logistics" color="#388E3C" fillcolor="#F1F8E9" shape=octagon style=filled]
+		nest1_2 [label="Delay Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=Mdiamond style=filled]
+		nest1_3 [label="Aircraft Maintenance" color="#388E3C" fillcolor="#F1F8E9" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=monitors color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=navigates color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=optimizes color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest1_0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_152.dot b/test/graphviz/graph_hard/graphviz_152.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a9142651ed7ce5f6bbf2622a091f869a3a805e2d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_152.dot
@@ -0,0 +1,88 @@
+digraph {
+	rankdir=LR
+	N0 [label="Aircraft Manufacturing" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Baggage Handling" color="#C0CA33" fillcolor="#F9FBE7" shape=oval style=filled]
+	N2 [label="Unmanned Aerial Vehicle Integration" color="#C0CA33" fillcolor="#F9FBE7" shape=oval style=filled]
+	N3 [label="Airport Operations" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N4 [label="Aircraft Maintenance" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N5 [label="Air Cargo Logistics" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N6 [label="Runway Management" color="#42A5F5" fillcolor="#F1F8FF" shape=octagon style=filled]
+	N7 [label="Aircraft De_icing" color="#64B5F6" fillcolor="#E3F2FD" shape=plaintext style=filled]
+	N8 [label="Next_Generation Air Traffic Management" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N9 [label="Noise Abatement Procedures" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N10 [label="Sustainable Aviation Fuel Development" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N11 [label="Flight Simulation" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+	N12 [label="Airworthiness Certification" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N13 [label="Passenger Boarding" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N14 [label="Crew Scheduling" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N15 [label="Aviation Safety Investigation" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N16 [label="Gate Assignment" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N17 [label="Ground Support" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	S0 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Regulatory Compliance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Airspace Management" color="#C0CA33" fillcolor="#F9FBE7" shape=diamond style=filled]
+		nest0_1 [label="Passenger Check_in" color="#64B5F6" fillcolor="#E3F2FD" shape=plaintext style=filled]
+		nest0_2 [label="In_flight Service" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Airport Security Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Fleet Management" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest1_1 [label="Route Optimization" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+		nest1_2 [label="Cargo Loading" color="#42A5F5" fillcolor="#F1F8FF" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=flies color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=routes color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N13 -> nest0_0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N12 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N12 -> nest1_0 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [label=manufactures color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N16 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N12 -> M0 [label=de_ices color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N16 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [label=repairs color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_152.txt b/test/graphviz/graph_hard/graphviz_152.txt
new file mode 100644
index 0000000000000000000000000000000000000000..973c8d1db34528fc889b8282dea4c0c14713a4d7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_152.txt
@@ -0,0 +1,48 @@
+<Air Cargo Logistics, connectedTo, Runway Management>
+<Aircraft De_icing, routes, Next_Generation Air Traffic Management>
+<Aircraft Maintenance, connectedTo, Air Cargo Logistics>
+<Aircraft Maintenance, repairs, Runway Management>
+<Aircraft Manufacturing, connectedTo, Baggage Handling>
+<Aircraft Manufacturing, connectedTo, Runway Management>
+<Airport Operations, connectedTo, Aviation Safety Investigation>
+<Airport Operations, connectedTo, Crew Scheduling>
+<Airport Operations, connectedTo, Runway Management>
+<Airport Operations, flies, Aircraft Maintenance>
+<Airspace Management, connectedTo, Passenger Check_in>
+<Airspace Management, partOf, Airspace Management>
+<Airworthiness Certification, connectedTo, Fleet Management>
+<Airworthiness Certification, connectedTo, Passenger Boarding>
+<Airworthiness Certification, de_ices, Gate Assignment>
+<Aviation Safety Investigation, connectedTo, Gate Assignment>
+<Baggage Handling, connectedTo, Unmanned Aerial Vehicle Integration>
+<Cargo Loading, connectedTo, Unmanned Aerial Vehicle Integration>
+<Cargo Loading, partOf, Cargo Loading>
+<Crew Scheduling, connectedTo, Aviation Safety Investigation>
+<Fleet Management, connectedTo, Route Optimization>
+<Fleet Management, partOf, Fleet Management>
+<Flight Simulation, connectedTo, Airworthiness Certification>
+<Gate Assignment, connectedTo, Ground Support>
+<In_flight Service, connectedTo, Airworthiness Certification>
+<In_flight Service, partOf, In_flight Service>
+<Next_Generation Air Traffic Management, connectedTo, Gate Assignment>
+<Next_Generation Air Traffic Management, connectedTo, Noise Abatement Procedures>
+<Noise Abatement Procedures, connectedTo, Gate Assignment>
+<Noise Abatement Procedures, connectedTo, Sustainable Aviation Fuel Development>
+<Passenger Boarding, connectedTo, Airspace Management>
+<Passenger Boarding, connectedTo, Crew Scheduling>
+<Passenger Check_in, connectedTo, In_flight Service>
+<Passenger Check_in, partOf, Passenger Check_in>
+<Route Optimization, connectedTo, Cargo Loading>
+<Route Optimization, partOf, Route Optimization>
+<Runway Management, connectedTo, Aircraft De_icing>
+<Runway Management, connectedTo, Aviation Safety Investigation>
+<Runway Management, connectedTo, Gate Assignment>
+<Runway Management, connectedTo, Next_Generation Air Traffic Management>
+<Runway Management, manufactures, Crew Scheduling>
+<Sustainable Aviation Fuel Development, connectedTo, Flight Simulation>
+<Unmanned Aerial Vehicle Integration, connectedTo, Aircraft De_icing>
+<Unmanned Aerial Vehicle Integration, connectedTo, Airport Operations>
+<Unmanned Aerial Vehicle Integration, connectedTo, Gate Assignment>
+<Unmanned Aerial Vehicle Integration, connectedTo, Next_Generation Air Traffic Management>
+<Unmanned Aerial Vehicle Integration, connectedTo, Runway Management>
+<Unmanned Aerial Vehicle Integration, connectedTo, Sustainable Aviation Fuel Development>
diff --git a/test/graphviz/graph_hard/graphviz_153.txt b/test/graphviz/graph_hard/graphviz_153.txt
new file mode 100644
index 0000000000000000000000000000000000000000..045836dfd2c7057f4cb231df1841b3d1a02bdee9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_153.txt
@@ -0,0 +1,36 @@
+<Air Traffic Control, connectedTo, Cargo Loading>
+<Aircraft Maintenance, connectedTo, Noise Abatement Procedures>
+<Aircraft Maintenance, partOf, Aircraft Maintenance>
+<Airport Operations, connectedTo, Airspace Management>
+<Airport Operations, connectedTo, Gate Assignment>
+<Airspace Management, connectedTo, Runway Management>
+<Airworthiness Certification, connectedTo, Baggage Handling>
+<Airworthiness Certification, partOf, Airworthiness Certification>
+<Baggage Handling, connectedTo, Flight Planning>
+<Crew Resource Management, connectedTo, Next_Generation Air Traffic Management>
+<Engine Overhaul, connectedTo, Air Traffic Control>
+<Fleet Management, connectedTo, Aircraft Maintenance>
+<Fleet Management, connectedTo, Engine Overhaul>
+<Fleet Management, connectedTo, Pilot Training>
+<Flight Planning, connectedTo, Airspace Management>
+<Flight Simulation, connectedTo, Crew Resource Management>
+<Gate Assignment, connectedTo, Airspace Management>
+<Gate Assignment, connectedTo, Flight Simulation>
+<Ground Support, connectedTo, Fleet Management>
+<Next_Generation Air Traffic Management, connectedTo, Airspace Management>
+<Next_Generation Air Traffic Management, connectedTo, Baggage Handling>
+<Next_Generation Air Traffic Management, connectedTo, Flight Planning>
+<Next_Generation Air Traffic Management, connectedTo, Security Screening>
+<Next_Generation Air Traffic Management, connectedTo, Unmanned Aerial Vehicle Integration>
+<Noise Abatement Procedures, connectedTo, Sustainable Aviation Fuel Development>
+<Noise Abatement Procedures, partOf, Noise Abatement Procedures>
+<Pilot Training, connectedTo, Airworthiness Certification>
+<Pilot Training, partOf, Pilot Training>
+<Regulatory Compliance, connectedTo, Ground Support>
+<Runway Management, connectedTo, Cargo Loading>
+<Runway Management, connectedTo, Engine Overhaul>
+<Runway Management, connectedTo, Security Screening>
+<Security Screening, connectedTo, Regulatory Compliance>
+<Sustainable Aviation Fuel Development, partOf, Sustainable Aviation Fuel Development>
+<Sustainable Aviation Fuel Development, secures, Airspace Management>
+<Unmanned Aerial Vehicle Integration, connectedTo, Baggage Handling>
diff --git a/test/graphviz/graph_hard/graphviz_155.txt b/test/graphviz/graph_hard/graphviz_155.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6035f33b282fc92a2e56326b8890dbb3a2f497f4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_155.txt
@@ -0,0 +1,33 @@
+<Bearing and Distance Calculation, connectedTo, Historical Traffic Data Analysis>
+<Bearing and Distance Calculation, partOf, Bearing and Distance Calculation>
+<Cycle Route Planning, connectedTo, Lane Guidance>
+<Cycle Route Planning, predicts, Hazard Alerts>
+<Digital Compass Integration, connectedTo, Indoor Navigation>
+<Hazard Alerts, connectedTo, Digital Compass Integration>
+<Hazard Alerts, connectedTo, Indoor Navigation>
+<Hazard Alerts, connectedTo, Location_Based Services>
+<Hazard Alerts, directs, Offline Map Support>
+<Historical Traffic Data Analysis, partOf, Historical Traffic Data Analysis>
+<Historical Traffic Data Analysis, secures, Reverse Geocoding>
+<Indoor Navigation, connectedTo, Location_Based Services>
+<Lane Guidance, connectedTo, Points of Interest Search>
+<Lane Guidance, partOf, Lane Guidance>
+<Multi_modal Navigation, connectedTo, Digital Compass Integration>
+<Multi_modal Navigation, connectedTo, Personalized Route Preferences>
+<Multi_modal Navigation, connectedTo, Waypoint Setting>
+<Offline Map Support, transmits, Reverse Geocoding>
+<Personalized Route Preferences, connectedTo, Bearing and Distance Calculation>
+<Personalized Route Preferences, partOf, Personalized Route Preferences>
+<Points of Interest Search, connectedTo, Route Calculation>
+<Points of Interest Search, partOf, Points of Interest Search>
+<Real_Time Re_routing, connectedTo, Digital Compass Integration>
+<Real_Time Re_routing, connectedTo, Hazard Alerts>
+<Real_Time Re_routing, connectedTo, Speed Calculation>
+<Reverse Geocoding, connectedTo, Digital Compass Integration>
+<Route Calculation, connectedTo, Waypoint Setting>
+<Route Calculation, partOf, Route Calculation>
+<Speed Calculation, avoids, Multi_modal Navigation>
+<Speed Calculation, connectedTo, Hazard Alerts>
+<Speed Calculation, connectedTo, Offline Map Support>
+<Waypoint Setting, connectedTo, Cycle Route Planning>
+<Waypoint Setting, connectedTo, Digital Compass Integration>
diff --git a/test/graphviz/graph_hard/graphviz_156.dot b/test/graphviz/graph_hard/graphviz_156.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7a7b119e5e8421ea08e6e2273a1ee0b79b3d23c8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_156.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=RL
+	N0 [label="Satellite Navigation Systems" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N1 [label="Lane Guidance" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N2 [label="Augmented Reality Navigation" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N3 [label="Public Transit Navigation" color="#FFEB3B" fillcolor="#FFF9C4" shape=folder style=filled]
+	N4 [label="Points of Interest Search" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N5 [label="Bearing and Distance Calculation" color="#F06292" fillcolor="#FCE4EC" shape=oval style=filled]
+	N6 [label="Speed Calculation" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N7 [label="Navigation Data Update" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N8 [label="Inertial Navigation System" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N9 [label="Terrestrial Navigation" color="#FFEB3B" fillcolor="#FFF9C4" shape=folder style=filled]
+	N10 [label="Waypoint Setting" color="#FFEB3B" fillcolor="#FFF9C4" shape=Mdiamond style=filled]
+	N11 [label="Digital Compass Integration" color="#FFEB3B" fillcolor="#FFF9C4" shape=octagon style=filled]
+	N12 [label="Altitude Tracking" color="#C2B2F0" fillcolor="#EFE6FF" shape=oval style=filled]
+	N13 [label=Geocoding color="#F06292" fillcolor="#FCE4EC" shape=octagon style=filled]
+	N14 [label="Marine Charting" color="#F06292" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N15 [label="Real_Time Re_routing" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N16 [label="Aeronautical Charting" color="#C2B2F0" fillcolor="#EFE6FF" shape=hexagon style=filled]
+	N17 [label="Pedestrian Navigation" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	S0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#F06292" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Cycle Route Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Indoor Navigation" color="#C2B2F0" fillcolor="#EFE6FF" shape=Mdiamond style=filled]
+		nest0_1 [label="Voice Guidance Customization" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Multi_modal Navigation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Location_Based Services" color="#FFEB3B" fillcolor="#FFF9C4" shape=oval style=filled]
+		nest1_1 [label="Map Display" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest1_2 [label="Reverse Geocoding" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest1_0 -> nest1_1 [label=avoids color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=integrates color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=validates color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [label=communicates color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N14 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N12 -> nest1_0 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N16 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N14 -> S1 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N9 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [label=verifies color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	M1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> M2 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N14 -> M2 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	M2 -> N17 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_156.txt b/test/graphviz/graph_hard/graphviz_156.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c79301e508f7deb901d78eda8553bd2124b8fc3a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_156.txt
@@ -0,0 +1,41 @@
+<Aeronautical Charting, connectedTo, Pedestrian Navigation>
+<Altitude Tracking, connectedTo, Location_Based Services>
+<Altitude Tracking, validates, Geocoding>
+<Augmented Reality Navigation, connectedTo, Aeronautical Charting>
+<Augmented Reality Navigation, connectedTo, Public Transit Navigation>
+<Bearing and Distance Calculation, connectedTo, Altitude Tracking>
+<Bearing and Distance Calculation, connectedTo, Digital Compass Integration>
+<Bearing and Distance Calculation, connectedTo, Geocoding>
+<Bearing and Distance Calculation, connectedTo, Marine Charting>
+<Bearing and Distance Calculation, integrates, Speed Calculation>
+<Digital Compass Integration, connectedTo, Altitude Tracking>
+<Geocoding, connectedTo, Marine Charting>
+<Geocoding, connectedTo, Pedestrian Navigation>
+<Indoor Navigation, connectedTo, Voice Guidance Customization>
+<Indoor Navigation, partOf, Indoor Navigation>
+<Inertial Navigation System, connectedTo, Terrestrial Navigation>
+<Lane Guidance, connectedTo, Augmented Reality Navigation>
+<Lane Guidance, connectedTo, Pedestrian Navigation>
+<Location_Based Services, avoids, Map Display>
+<Location_Based Services, partOf, Location_Based Services>
+<Map Display, connectedTo, Reverse Geocoding>
+<Map Display, partOf, Map Display>
+<Marine Charting, connectedTo, Aeronautical Charting>
+<Marine Charting, connectedTo, Pedestrian Navigation>
+<Marine Charting, connectedTo, Real_Time Re_routing>
+<Navigation Data Update, connectedTo, Inertial Navigation System>
+<Points of Interest Search, connectedTo, Bearing and Distance Calculation>
+<Public Transit Navigation, connectedTo, Pedestrian Navigation>
+<Public Transit Navigation, connectedTo, Points of Interest Search>
+<Real_Time Re_routing, connectedTo, Aeronautical Charting>
+<Reverse Geocoding, connectedTo, Aeronautical Charting>
+<Reverse Geocoding, partOf, Reverse Geocoding>
+<Satellite Navigation Systems, connectedTo, Lane Guidance>
+<Satellite Navigation Systems, verifies, Aeronautical Charting>
+<Speed Calculation, connectedTo, Navigation Data Update>
+<Terrestrial Navigation, communicates, Indoor Navigation>
+<Terrestrial Navigation, connectedTo, Aeronautical Charting>
+<Terrestrial Navigation, connectedTo, Waypoint Setting>
+<Voice Guidance Customization, connectedTo, Marine Charting>
+<Voice Guidance Customization, partOf, Voice Guidance Customization>
+<Waypoint Setting, connectedTo, Digital Compass Integration>
diff --git a/test/graphviz/graph_hard/graphviz_157.dot b/test/graphviz/graph_hard/graphviz_157.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0cb45bf20b2c7171b9168b80d1d331351a43176b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_157.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=LR
+	N0 [label="Printing Process" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N1 [label="Custom Part Production" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N2 [label="Printing Parameter Optimization" color="#00BCD4" fillcolor="#E0F7FA" shape=folder style=filled]
+	N3 [label="Distributed Manufacturing" color="#00BCD4" fillcolor="#E0F7FA" shape=plaintext style=filled]
+	N4 [label="Scaffolding for Tissue Engineering" color="#BCB88A" fillcolor="#F5F5DC" shape=parallelogram style=filled]
+	N5 [label="Medical Device Prototyping" color="#BCB88A" fillcolor="#F5F5DC" shape=plaintext style=filled]
+	N6 [label="Additive Manufacturing" color="#66BB6A" fillcolor="#E8F5E9" shape=Mdiamond style=filled]
+	N7 [label="3D Model Design" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N8 [label="Digital Twin for 3D Prints" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N9 [label="Slicing Software Operation" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#66BB6A" fillcolor="#E8F5E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Material Selection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Maintenance and Repair of Printers" color="#66BB6A" fillcolor="#E8F5E9" shape=oval style=filled]
+		nest0_1 [label="Printer Setup" color="#66BB6A" fillcolor="#E8F5E9" shape=diamond style=filled]
+		nest0_2 [label="4D Printing" color="#00BCD4" fillcolor="#E0F7FA" shape=Mdiamond style=filled]
+		nest0_3 [label="On_Demand Production" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Educational Applications" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Aerospace Part Production" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest1_1 [label="Reverse Engineering with 3D Printing" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+		nest1_2 [label="File Format Conversion" color="#00BCD4" fillcolor="#E0F7FA" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=engineers color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [label=tests color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N3 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [label=educates color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N0 -> S2 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [label=materials color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_157.txt b/test/graphviz/graph_hard/graphviz_157.txt
new file mode 100644
index 0000000000000000000000000000000000000000..71f770670b679186c73e7e21a183fb1ec15ef7bf
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_157.txt
@@ -0,0 +1,33 @@
+<3D Model Design, connectedTo, Digital Twin for 3D Prints>
+<3D Model Design, tests, Maintenance and Repair of Printers>
+<4D Printing, connectedTo, On_Demand Production>
+<4D Printing, partOf, 4D Printing>
+<Additive Manufacturing, connectedTo, 3D Model Design>
+<Additive Manufacturing, connectedTo, Aerospace Part Production>
+<Aerospace Part Production, connectedTo, Reverse Engineering with 3D Printing>
+<Aerospace Part Production, partOf, Aerospace Part Production>
+<Custom Part Production, connectedTo, Printing Parameter Optimization>
+<Digital Twin for 3D Prints, engineers, Slicing Software Operation>
+<Distributed Manufacturing, connectedTo, Medical Device Prototyping>
+<Distributed Manufacturing, connectedTo, Scaffolding for Tissue Engineering>
+<Distributed Manufacturing, connectedTo, Slicing Software Operation>
+<Distributed Manufacturing, educates, 3D Model Design>
+<Distributed Manufacturing, materials, Medical Device Prototyping>
+<File Format Conversion, connectedTo, Printing Parameter Optimization>
+<File Format Conversion, partOf, File Format Conversion>
+<Maintenance and Repair of Printers, connectedTo, Printer Setup>
+<Maintenance and Repair of Printers, partOf, Maintenance and Repair of Printers>
+<Medical Device Prototyping, connectedTo, Additive Manufacturing>
+<On_Demand Production, connectedTo, Distributed Manufacturing>
+<On_Demand Production, partOf, On_Demand Production>
+<Printer Setup, connectedTo, 4D Printing>
+<Printer Setup, partOf, Printer Setup>
+<Printing Parameter Optimization, connectedTo, Distributed Manufacturing>
+<Printing Process, connectedTo, Additive Manufacturing>
+<Printing Process, connectedTo, Custom Part Production>
+<Printing Process, connectedTo, Distributed Manufacturing>
+<Printing Process, connectedTo, Medical Device Prototyping>
+<Printing Process, connectedTo, Printing Parameter Optimization>
+<Reverse Engineering with 3D Printing, connectedTo, File Format Conversion>
+<Reverse Engineering with 3D Printing, partOf, Reverse Engineering with 3D Printing>
+<Scaffolding for Tissue Engineering, connectedTo, Medical Device Prototyping>
diff --git a/test/graphviz/graph_hard/graphviz_158.txt b/test/graphviz/graph_hard/graphviz_158.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5185e48e1c6e87412dc14d3c5db9d50ae0371a7e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_158.txt
@@ -0,0 +1,30 @@
+<4D Printing, connectedTo, Material Selection>
+<Additive Manufacturing, connectedTo, Aerospace Part Production>
+<Additive Manufacturing, connectedTo, Printing Process>
+<Aerospace Part Production, connectedTo, Intellectual Property Protection for Designs>
+<Aerospace Part Production, connectedTo, On_Demand Production>
+<Aerospace Part Production, connectedTo, Rapid Manufacturing>
+<Aerospace Part Production, optimizes, Print Farm Management>
+<Consumer Product Creation, connectedTo, Scaffolding for Tissue Engineering>
+<Consumer Product Creation, partOf, Consumer Product Creation>
+<Custom Part Production, connectedTo, Mass Customization>
+<Custom Part Production, connectedTo, Multi_Material Printing>
+<Educational Applications, connectedTo, Aerospace Part Production>
+<Educational Applications, connectedTo, Intellectual Property Protection for Designs>
+<Educational Applications, connectedTo, Print Farm Management>
+<Educational Applications, connectedTo, Rapid Manufacturing>
+<Fused Deposition Modeling, connectedTo, Custom Part Production>
+<Intellectual Property Protection for Designs, connectedTo, On_Demand Production>
+<Mass Customization, connectedTo, 4D Printing>
+<Mass Customization, connectedTo, Consumer Product Creation>
+<Material Research and Development, connectedTo, Aerospace Part Production>
+<Material Research and Development, partOf, Material Research and Development>
+<Material Selection, automates, Additive Manufacturing>
+<Material Selection, connectedTo, Aerospace Part Production>
+<Multi_Material Printing, connectedTo, Material Research and Development>
+<Multi_Material Printing, partOf, Multi_Material Printing>
+<On_Demand Production, connectedTo, Rapid Manufacturing>
+<Printing Process, customizes, Educational Applications>
+<Rapid Manufacturing, connectedTo, Print Farm Management>
+<Scaffolding for Tissue Engineering, connectedTo, On_Demand Production>
+<Scaffolding for Tissue Engineering, partOf, Scaffolding for Tissue Engineering>
diff --git a/test/graphviz/graph_hard/graphviz_159.txt b/test/graphviz/graph_hard/graphviz_159.txt
new file mode 100644
index 0000000000000000000000000000000000000000..914bc6c923389ceec85e6c49265f10bcc7b9ef10
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_159.txt
@@ -0,0 +1,36 @@
+<4D Printing, connectedTo, Educational Applications>
+<4D Printing, connectedTo, Material Research and Development>
+<4D Printing, connectedTo, Printing Process>
+<Custom Part Production, connectedTo, Distributed Manufacturing>
+<Custom Part Production, connectedTo, Printing Parameter Optimization>
+<Direct Metal Laser Sintering, connectedTo, Scaffolding for Tissue Engineering>
+<Educational Applications, connectedTo, Custom Part Production>
+<Educational Applications, connectedTo, Distributed Manufacturing>
+<Educational Applications, connectedTo, File Format Conversion>
+<Educational Applications, connectedTo, Printing Process>
+<File Format Conversion, connectedTo, Printing Process>
+<File Format Conversion, connectedTo, Quality Control>
+<Maintenance and Repair of Printers, connectedTo, Mass Customization>
+<Maintenance and Repair of Printers, partOf, Maintenance and Repair of Printers>
+<Mass Customization, connectedTo, Material Selection>
+<Mass Customization, partOf, Mass Customization>
+<Material Research and Development, connectedTo, Educational Applications>
+<Material Research and Development, troubleshoots, Printing Process>
+<Material Selection, connectedTo, Scaffolding for Tissue Engineering>
+<Material Selection, partOf, Material Selection>
+<Post_Processing, connectedTo, File Format Conversion>
+<Post_Processing, partOf, Post_Processing>
+<Print Farm Management, connectedTo, Post_Processing>
+<Print Farm Management, partOf, Print Farm Management>
+<Printing Parameter Optimization, connectedTo, Maintenance and Repair of Printers>
+<Printing Parameter Optimization, partOf, Printing Parameter Optimization>
+<Printing Process, connectedTo, Direct Metal Laser Sintering>
+<Quality Control, connectedTo, Print Farm Management>
+<Quality Control, partOf, Quality Control>
+<Scaffolding for Tissue Engineering, connectedTo, Custom Part Production>
+<Selective Laser Sintering, connectedTo, 4D Printing>
+<Selective Laser Sintering, connectedTo, Distributed Manufacturing>
+<Selective Laser Sintering, connectedTo, Educational Applications>
+<Selective Laser Sintering, connectedTo, File Format Conversion>
+<Selective Laser Sintering, connectedTo, Material Research and Development>
+<Selective Laser Sintering, connectedTo, Printing Process>
diff --git a/test/graphviz/graph_hard/graphviz_16.dot b/test/graphviz/graph_hard/graphviz_16.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7b76f3db5ec11941a0804f1ab3ed3f08894e75e3
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_16.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=BT
+	N0 [label="Accident Reconstruction" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N1 [label="Air Traffic Control" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N2 [label="Train Dispatch" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	N3 [label="Intermodal Transfer" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N4 [label="Delay Alert" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N5 [label="Incident Report" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N6 [label="Luggage Handling" color="#6EB76D" fillcolor="#E9F7E8" shape=Mdiamond style=filled]
+	N7 [label="Tunnel Monitoring" color="#6EB76D" fillcolor="#E9F7E8" shape=folder style=filled]
+	N8 [label="Schedule Generation" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N9 [label="Maintenance Check" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	N10 [label="Platform Assignment" color="#00BCD4" fillcolor="#B2EBF2" shape=octagon style=filled]
+	N11 [label="Route Optimization" color="#6EB76D" fillcolor="#E9F7E8" shape=octagon style=filled]
+	N12 [label="Weather Impact Assessment" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N13 [label="Customs Clearance" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N14 [label="Location Input" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N15 [label="Public Transport Ticketing" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N16 [label="Driver Allocation" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Emergency Landing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Bridge Inspection" color="#00BCD4" fillcolor="#B2EBF2" shape=diamond style=filled]
+		nest0_1 [label="Traffic Monitoring" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+		nest0_2 [label="Ride_sharing Request" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest0_3 [label="Road Network Management" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Security Check" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Parking Management" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+		nest1_1 [label="Fleet Management" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N3 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S0 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N8 -> S1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [label=audits color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N2 -> S2 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_16.txt b/test/graphviz/graph_hard/graphviz_16.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f5aa4260edaa63792759f863064104f6f907f665
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_16.txt
@@ -0,0 +1,42 @@
+<Accident Reconstruction, connectedTo, Air Traffic Control>
+<Air Traffic Control, connectedTo, Incident Report>
+<Air Traffic Control, connectedTo, Train Dispatch>
+<Bridge Inspection, connectedTo, Traffic Monitoring>
+<Bridge Inspection, partOf, Bridge Inspection>
+<Customs Clearance, connectedTo, Location Input>
+<Delay Alert, connectedTo, Incident Report>
+<Fleet Management, connectedTo, Intermodal Transfer>
+<Fleet Management, partOf, Fleet Management>
+<Incident Report, connectedTo, Luggage Handling>
+<Intermodal Transfer, connectedTo, Delay Alert>
+<Intermodal Transfer, connectedTo, Parking Management>
+<Location Input, connectedTo, Public Transport Ticketing>
+<Luggage Handling, connectedTo, Tunnel Monitoring>
+<Maintenance Check, connectedTo, Platform Assignment>
+<Parking Management, connectedTo, Fleet Management>
+<Parking Management, partOf, Parking Management>
+<Platform Assignment, connectedTo, Route Optimization>
+<Public Transport Ticketing, connectedTo, Driver Allocation>
+<Ride_sharing Request, connectedTo, Road Network Management>
+<Ride_sharing Request, partOf, Ride_sharing Request>
+<Road Network Management, connectedTo, Tunnel Monitoring>
+<Road Network Management, partOf, Road Network Management>
+<Route Optimization, connectedTo, Driver Allocation>
+<Route Optimization, connectedTo, Location Input>
+<Route Optimization, connectedTo, Public Transport Ticketing>
+<Route Optimization, connectedTo, Weather Impact Assessment>
+<Schedule Generation, audits, Platform Assignment>
+<Schedule Generation, connectedTo, Driver Allocation>
+<Schedule Generation, connectedTo, Maintenance Check>
+<Schedule Generation, connectedTo, Platform Assignment>
+<Schedule Generation, connectedTo, Weather Impact Assessment>
+<Traffic Monitoring, connectedTo, Ride_sharing Request>
+<Traffic Monitoring, partOf, Traffic Monitoring>
+<Train Dispatch, connectedTo, Bridge Inspection>
+<Train Dispatch, connectedTo, Delay Alert>
+<Train Dispatch, connectedTo, Incident Report>
+<Train Dispatch, connectedTo, Intermodal Transfer>
+<Train Dispatch, connectedTo, Schedule Generation>
+<Tunnel Monitoring, connectedTo, Platform Assignment>
+<Tunnel Monitoring, connectedTo, Schedule Generation>
+<Weather Impact Assessment, connectedTo, Customs Clearance>
diff --git a/test/graphviz/graph_hard/graphviz_160.dot b/test/graphviz/graph_hard/graphviz_160.dot
new file mode 100644
index 0000000000000000000000000000000000000000..86fcadfbb71373f238d034b3659a7463b66bf6b5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_160.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=TD
+	N0 [label="Drug Delivery Systems" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="X_ray Diffraction" color="#AF56A6" fillcolor="#DDCEDD" shape=Mdiamond style=filled]
+	N2 [label="Lab_on_a_Chip Devices" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N3 [label=Photovoltaics color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N4 [label="Environmental Remediation with Nanomaterials" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+	N5 [label="Solar Cell Efficiency Enhancement" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N6 [label="Computational Nanotechnology" color="#AF56A6" fillcolor="#DDCEDD" shape=oval style=filled]
+	N7 [label="Nanoscale Imaging" color="#AF56A6" fillcolor="#DDCEDD" shape=Mdiamond style=filled]
+	N8 [label="Carbon Nanotube Synthesis" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N9 [label="Quantum Dots" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N10 [label="Nanofabrication Techniques" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N11 [label="Regulatory Framework for Nanotech" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N12 [label="Energy Storage Applications" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N13 [label="Food Packaging Improvement" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N14 [label="Water Purification using Nanomaterials" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	S0 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label=Nanocomposites labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Spintronics color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest0_1 [label=Nanocoatings color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+		nest0_2 [label=Nanoelectronics color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest0_3 [label="Advanced Materials Research" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Graphene Production" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Public Perception of Nanotechnology" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest1_1 [label="Catalysis at Nanoscale" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest0_0 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N13 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N11 -> S1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_160.txt b/test/graphviz/graph_hard/graphviz_160.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5e8a506b4617e7fe93c5d467e7a51d8fb6860ce5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_160.txt
@@ -0,0 +1,39 @@
+<Advanced Materials Research, connectedTo, Lab_on_a_Chip Devices>
+<Advanced Materials Research, partOf, Advanced Materials Research>
+<Carbon Nanotube Synthesis, connectedTo, Quantum Dots>
+<Catalysis at Nanoscale, connectedTo, Food Packaging Improvement>
+<Catalysis at Nanoscale, partOf, Catalysis at Nanoscale>
+<Computational Nanotechnology, connectedTo, Nanoscale Imaging>
+<Computational Nanotechnology, connectedTo, Public Perception of Nanotechnology>
+<Drug Delivery Systems, connectedTo, Environmental Remediation with Nanomaterials>
+<Drug Delivery Systems, connectedTo, X_ray Diffraction>
+<Energy Storage Applications, connectedTo, Food Packaging Improvement>
+<Environmental Remediation with Nanomaterials, connectedTo, Computational Nanotechnology>
+<Environmental Remediation with Nanomaterials, connectedTo, Solar Cell Efficiency Enhancement>
+<Food Packaging Improvement, connectedTo, Water Purification using Nanomaterials>
+<Lab_on_a_Chip Devices, connectedTo, Computational Nanotechnology>
+<Lab_on_a_Chip Devices, connectedTo, Environmental Remediation with Nanomaterials>
+<Lab_on_a_Chip Devices, connectedTo, Photovoltaics>
+<Nanocoatings, connectedTo, Nanoelectronics>
+<Nanocoatings, partOf, Nanocoatings>
+<Nanoelectronics, connectedTo, Advanced Materials Research>
+<Nanoelectronics, partOf, Nanoelectronics>
+<Nanofabrication Techniques, connectedTo, Regulatory Framework for Nanotech>
+<Nanoscale Imaging, connectedTo, Carbon Nanotube Synthesis>
+<Photovoltaics, connectedTo, Computational Nanotechnology>
+<Photovoltaics, connectedTo, Environmental Remediation with Nanomaterials>
+<Public Perception of Nanotechnology, connectedTo, Catalysis at Nanoscale>
+<Public Perception of Nanotechnology, partOf, Public Perception of Nanotechnology>
+<Quantum Dots, connectedTo, Nanofabrication Techniques>
+<Regulatory Framework for Nanotech, connectedTo, Energy Storage Applications>
+<Regulatory Framework for Nanotech, connectedTo, Food Packaging Improvement>
+<Regulatory Framework for Nanotech, connectedTo, Spintronics>
+<Regulatory Framework for Nanotech, connectedTo, Water Purification using Nanomaterials>
+<Solar Cell Efficiency Enhancement, connectedTo, Carbon Nanotube Synthesis>
+<Solar Cell Efficiency Enhancement, connectedTo, Computational Nanotechnology>
+<Solar Cell Efficiency Enhancement, connectedTo, Nanoscale Imaging>
+<Solar Cell Efficiency Enhancement, connectedTo, Quantum Dots>
+<Spintronics, connectedTo, Nanocoatings>
+<Spintronics, partOf, Spintronics>
+<X_ray Diffraction, connectedTo, Environmental Remediation with Nanomaterials>
+<X_ray Diffraction, connectedTo, Lab_on_a_Chip Devices>
diff --git a/test/graphviz/graph_hard/graphviz_161.dot b/test/graphviz/graph_hard/graphviz_161.dot
new file mode 100644
index 0000000000000000000000000000000000000000..16dc4f46010755b7a371e5359f6755b440ea364c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_161.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=BT
+	N0 [label="Molecular Self_Assembly" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N1 [label="X_ray Diffraction" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N2 [label=Photovoltaics color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N3 [label="Nanomedicine Development" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N4 [label="Water Purification using Nanomaterials" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N5 [label=Nanosensors color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N6 [label="Computational Nanotechnology" color="#7E57C2" fillcolor="#D1C4E9" shape=plaintext style=filled]
+	N7 [label="Ethical Implications of Nanotech" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N8 [label=Nanotoxicology color="#7E57C2" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+	N9 [label="Environmental Remediation with Nanomaterials" color="#7E57C2" fillcolor="#D1C4E9" shape=folder style=filled]
+	N10 [label="Energy Storage Applications" color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+	N11 [label="Solar Cell Efficiency Enhancement" color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+	N12 [label="Public Perception of Nanotechnology" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N13 [label="Food Packaging Improvement" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	S0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#92C79A" fillcolor="#E8F0EA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Advanced Materials Research" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Atomic Force Microscopy" color="#92C79A" fillcolor="#E8F0EA" shape=octagon style=filled]
+		nest0_1 [label="Nanodevice Fabrication" color="#92C79A" fillcolor="#E8F0EA" shape=diamond style=filled]
+		nest0_2 [label="Quantum Computing Integration" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Lab_on_a_Chip Devices" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Surface Functionalization" color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+		nest1_1 [label="Carbon Nanotube Synthesis" color="#92C79A" fillcolor="#E8F0EA" shape=folder style=filled]
+		nest1_2 [label="Risk Assessment of Nanomaterials" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=enhances color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N12 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> S1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N0 -> S2 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N2 [label=develops color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [label=optimizes color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M2 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	M2 -> N9 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_161.txt b/test/graphviz/graph_hard/graphviz_161.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f6c7e49d060317101cc8d63315a4799686239395
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_161.txt
@@ -0,0 +1,47 @@
+<Atomic Force Microscopy, connectedTo, Nanodevice Fabrication>
+<Atomic Force Microscopy, partOf, Atomic Force Microscopy>
+<Carbon Nanotube Synthesis, connectedTo, Risk Assessment of Nanomaterials>
+<Carbon Nanotube Synthesis, partOf, Carbon Nanotube Synthesis>
+<Computational Nanotechnology, connectedTo, Energy Storage Applications>
+<Computational Nanotechnology, connectedTo, Ethical Implications of Nanotech>
+<Computational Nanotechnology, connectedTo, Nanotoxicology>
+<Computational Nanotechnology, connectedTo, Public Perception of Nanotechnology>
+<Energy Storage Applications, connectedTo, Solar Cell Efficiency Enhancement>
+<Environmental Remediation with Nanomaterials, connectedTo, Energy Storage Applications>
+<Ethical Implications of Nanotech, connectedTo, Environmental Remediation with Nanomaterials>
+<Ethical Implications of Nanotech, connectedTo, Nanotoxicology>
+<Ethical Implications of Nanotech, connectedTo, Surface Functionalization>
+<Molecular Self_Assembly, connectedTo, Computational Nanotechnology>
+<Molecular Self_Assembly, connectedTo, Ethical Implications of Nanotech>
+<Molecular Self_Assembly, connectedTo, Nanotoxicology>
+<Molecular Self_Assembly, connectedTo, Solar Cell Efficiency Enhancement>
+<Molecular Self_Assembly, connectedTo, X_ray Diffraction>
+<Molecular Self_Assembly, develops, Photovoltaics>
+<Nanodevice Fabrication, connectedTo, Quantum Computing Integration>
+<Nanodevice Fabrication, partOf, Nanodevice Fabrication>
+<Nanomedicine Development, connectedTo, Computational Nanotechnology>
+<Nanomedicine Development, connectedTo, Nanotoxicology>
+<Nanomedicine Development, connectedTo, Water Purification using Nanomaterials>
+<Nanosensors, connectedTo, Computational Nanotechnology>
+<Nanotoxicology, connectedTo, Energy Storage Applications>
+<Nanotoxicology, connectedTo, Food Packaging Improvement>
+<Nanotoxicology, connectedTo, Public Perception of Nanotechnology>
+<Nanotoxicology, connectedTo, Solar Cell Efficiency Enhancement>
+<Nanotoxicology, enhances, Environmental Remediation with Nanomaterials>
+<Photovoltaics, connectedTo, Atomic Force Microscopy>
+<Photovoltaics, connectedTo, Nanomedicine Development>
+<Photovoltaics, optimizes, Nanotoxicology>
+<Public Perception of Nanotechnology, connectedTo, Food Packaging Improvement>
+<Quantum Computing Integration, connectedTo, Public Perception of Nanotechnology>
+<Quantum Computing Integration, partOf, Quantum Computing Integration>
+<Risk Assessment of Nanomaterials, connectedTo, Photovoltaics>
+<Risk Assessment of Nanomaterials, partOf, Risk Assessment of Nanomaterials>
+<Solar Cell Efficiency Enhancement, connectedTo, Public Perception of Nanotechnology>
+<Surface Functionalization, connectedTo, Carbon Nanotube Synthesis>
+<Surface Functionalization, partOf, Surface Functionalization>
+<Water Purification using Nanomaterials, connectedTo, Environmental Remediation with Nanomaterials>
+<Water Purification using Nanomaterials, connectedTo, Nanosensors>
+<Water Purification using Nanomaterials, connectedTo, Nanotoxicology>
+<X_ray Diffraction, connectedTo, Computational Nanotechnology>
+<X_ray Diffraction, connectedTo, Environmental Remediation with Nanomaterials>
+<X_ray Diffraction, connectedTo, Photovoltaics>
diff --git a/test/graphviz/graph_hard/graphviz_162.dot b/test/graphviz/graph_hard/graphviz_162.dot
new file mode 100644
index 0000000000000000000000000000000000000000..73e7c660e08e9d28ded890008c0b504133f34d1b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_162.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=RL
+	N0 [label=Photovoltaics color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N1 [label="Ethical Implications of Nanotech" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N2 [label="Nanomedicine Development" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N3 [label=Spectroscopy color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N4 [label="Nanofabrication Techniques" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N5 [label="Quantum Dots" color="#A188D0" fillcolor="#DACBE3" shape=folder style=filled]
+	N6 [label="Public Perception of Nanotechnology" color="#42A5F5" fillcolor="#F1F8FF" shape=Mdiamond style=filled]
+	N7 [label="Advanced Materials Research" color="#A188D0" fillcolor="#DACBE3" shape=folder style=filled]
+	N8 [label="Catalysis at Nanoscale" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N9 [label=Nanocomposites color="#42A5F5" fillcolor="#F1F8FF" shape=oval style=filled]
+	N10 [label=Spintronics color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+	N11 [label="Nanoparticle Characterization" color="#42A5F5" fillcolor="#F1F8FF" shape=octagon style=filled]
+	N12 [label="Atomic Force Microscopy" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N13 [label="Nanoscale Imaging" color="#00BCD4" fillcolor="#B2EBF2" shape=parallelogram style=filled]
+	N14 [label="Water Purification using Nanomaterials" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Quantum Computing Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Regulatory Framework for Nanotech" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+		nest0_1 [label="Drug Delivery Systems" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest0_2 [label="Solar Cell Efficiency Enhancement" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Environmental Remediation with Nanomaterials" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Scanning Electron Microscopy" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+		nest1_1 [label="Molecular Self_Assembly" color="#A188D0" fillcolor="#DACBE3" shape=oval style=filled]
+		nest1_2 [label="Transmission Electron Microscopy" color="#A188D0" fillcolor="#DACBE3" shape=oval style=filled]
+		nest1_3 [label=Biosensors color="#00BCD4" fillcolor="#B2EBF2" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=protects color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> nest0_0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N6 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [label=assembles color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> S0 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> S1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_162.txt b/test/graphviz/graph_hard/graphviz_162.txt
new file mode 100644
index 0000000000000000000000000000000000000000..518201f42f98dc16b980de18b2264ea66f92b0b0
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_162.txt
@@ -0,0 +1,37 @@
+<Advanced Materials Research, connectedTo, Catalysis at Nanoscale>
+<Advanced Materials Research, connectedTo, Nanocomposites>
+<Advanced Materials Research, connectedTo, Nanoscale Imaging>
+<Atomic Force Microscopy, connectedTo, Nanoscale Imaging>
+<Biosensors, connectedTo, Advanced Materials Research>
+<Biosensors, partOf, Biosensors>
+<Catalysis at Nanoscale, connectedTo, Nanocomposites>
+<Drug Delivery Systems, connectedTo, Solar Cell Efficiency Enhancement>
+<Drug Delivery Systems, partOf, Drug Delivery Systems>
+<Ethical Implications of Nanotech, connectedTo, Nanofabrication Techniques>
+<Ethical Implications of Nanotech, connectedTo, Nanomedicine Development>
+<Molecular Self_Assembly, connectedTo, Transmission Electron Microscopy>
+<Molecular Self_Assembly, partOf, Molecular Self_Assembly>
+<Nanocomposites, connectedTo, Spintronics>
+<Nanofabrication Techniques, protects, Quantum Dots>
+<Nanomedicine Development, connectedTo, Nanofabrication Techniques>
+<Nanomedicine Development, connectedTo, Spectroscopy>
+<Nanoparticle Characterization, connectedTo, Atomic Force Microscopy>
+<Nanoparticle Characterization, connectedTo, Nanoscale Imaging>
+<Nanoparticle Characterization, connectedTo, Water Purification using Nanomaterials>
+<Nanoscale Imaging, connectedTo, Regulatory Framework for Nanotech>
+<Nanoscale Imaging, connectedTo, Water Purification using Nanomaterials>
+<Photovoltaics, connectedTo, Ethical Implications of Nanotech>
+<Photovoltaics, connectedTo, Nanofabrication Techniques>
+<Public Perception of Nanotechnology, connectedTo, Advanced Materials Research>
+<Quantum Dots, connectedTo, Public Perception of Nanotechnology>
+<Regulatory Framework for Nanotech, connectedTo, Drug Delivery Systems>
+<Regulatory Framework for Nanotech, partOf, Regulatory Framework for Nanotech>
+<Scanning Electron Microscopy, connectedTo, Molecular Self_Assembly>
+<Scanning Electron Microscopy, partOf, Scanning Electron Microscopy>
+<Solar Cell Efficiency Enhancement, connectedTo, Public Perception of Nanotechnology>
+<Solar Cell Efficiency Enhancement, partOf, Solar Cell Efficiency Enhancement>
+<Spectroscopy, connectedTo, Nanofabrication Techniques>
+<Spintronics, assembles, Scanning Electron Microscopy>
+<Spintronics, connectedTo, Nanoparticle Characterization>
+<Transmission Electron Microscopy, connectedTo, Biosensors>
+<Transmission Electron Microscopy, partOf, Transmission Electron Microscopy>
diff --git a/test/graphviz/graph_hard/graphviz_163.dot b/test/graphviz/graph_hard/graphviz_163.dot
new file mode 100644
index 0000000000000000000000000000000000000000..528b89511c14d6fafe6af8b86010d5eb6e6d39a8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_163.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=TD
+	N0 [label="Quantum Sensing" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N1 [label="Quantum Computing for AI" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N2 [label="Quantum Computing Benchmarking" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N3 [label="Quantum Error Correction" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N4 [label="Quantum Algorithm Development" color="#6FE1D5" fillcolor="#C9EFEC" shape=Mdiamond style=filled]
+	N5 [label="Quantum Communication Protocols" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N6 [label="Superconducting Qubits" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N7 [label="Quantum Coherence Management" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+	N8 [label="Quantum Entanglement Generation" color="#6FE1D5" fillcolor="#C9EFEC" shape=Mdiamond style=filled]
+	N9 [label="Trapped Ion Qubits" color="#2196F3" fillcolor="#BBDEFB" shape=oval style=filled]
+	N10 [label="Decoherence Mitigation" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N11 [label="Optimization Problems with Quantum Annealing" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N12 [label="Post_Quantum Cryptography" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N13 [label="Financial Modeling with Quantum Computing" color="#6FE1D5" fillcolor="#C9EFEC" shape=folder style=filled]
+	N14 [label="Interfacing Classical and Quantum Computers" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	S0 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Quantum Circuit Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Quantum Computing Education" color="#AB47BC" fillcolor="#F3E5F5" shape=octagon style=filled]
+		nest0_1 [label="Quantum Hardware Control" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Laser Cooling for Ions" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Quantum Programming Languages" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+		nest1_1 [label="Photonic Qubits" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=validates color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N11 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N13 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N8 -> S0 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N8 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S2 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [label=educates color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N6 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [label=debugs color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N13 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [label=encrypts color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	M2 -> N3 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_164.dot b/test/graphviz/graph_hard/graphviz_164.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0401176d5ca27f678e9db3ab2e0b7eca16c10177
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_164.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=LR
+	N0 [label="Cryogenic Systems for Qubits" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N1 [label="Laser Cooling for Ions" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N2 [label="Microwave Control for Qubits" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N3 [label="Trapped Ion Qubits" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N4 [label="Quantum Entanglement Generation" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N5 [label="Quantum Error Correction" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N6 [label="Superconducting Qubits" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N7 [label="Interfacing Classical and Quantum Computers" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N8 [label="Optimization Problems with Quantum Annealing" color="#BCB88A" fillcolor="#F5F5DC" shape=oval style=filled]
+	N9 [label="Quantum Communication Protocols" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+	N10 [label="Quantum Cryptography" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	S0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Quantum Computing Benchmarking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Quantum Circuit Design" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+		nest0_1 [label="Quantum Coherence Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+		nest0_2 [label="Vacuum Systems for Trapped Ions" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+		nest0_3 [label="Quantum Sensing" color="#4DD0E1" fillcolor="#C9F0F0" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Quantum Processor Fabrication" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Quantum Annealing" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+		nest1_1 [label="Quantum Software Development Kit" color="#BCB88A" fillcolor="#F5F5DC" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=factors color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=corrects color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=computes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N7 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [label=protects color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [label=educates color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_164.txt b/test/graphviz/graph_hard/graphviz_164.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e454504d13f8f88f4998c386495ec42a3f28b67f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_164.txt
@@ -0,0 +1,34 @@
+<Cryogenic Systems for Qubits, connectedTo, Quantum Communication Protocols>
+<Cryogenic Systems for Qubits, connectedTo, Quantum Entanglement Generation>
+<Cryogenic Systems for Qubits, connectedTo, Quantum Error Correction>
+<Cryogenic Systems for Qubits, connectedTo, Trapped Ion Qubits>
+<Cryogenic Systems for Qubits, factors, Laser Cooling for Ions>
+<Cryogenic Systems for Qubits, protects, Quantum Entanglement Generation>
+<Interfacing Classical and Quantum Computers, computes, Optimization Problems with Quantum Annealing>
+<Laser Cooling for Ions, connectedTo, Microwave Control for Qubits>
+<Laser Cooling for Ions, connectedTo, Trapped Ion Qubits>
+<Microwave Control for Qubits, connectedTo, Optimization Problems with Quantum Annealing>
+<Microwave Control for Qubits, connectedTo, Quantum Annealing>
+<Microwave Control for Qubits, connectedTo, Quantum Circuit Design>
+<Microwave Control for Qubits, connectedTo, Trapped Ion Qubits>
+<Optimization Problems with Quantum Annealing, connectedTo, Quantum Communication Protocols>
+<Quantum Annealing, connectedTo, Quantum Software Development Kit>
+<Quantum Annealing, partOf, Quantum Annealing>
+<Quantum Circuit Design, connectedTo, Quantum Coherence Management>
+<Quantum Circuit Design, partOf, Quantum Circuit Design>
+<Quantum Coherence Management, connectedTo, Vacuum Systems for Trapped Ions>
+<Quantum Coherence Management, partOf, Quantum Coherence Management>
+<Quantum Communication Protocols, connectedTo, Quantum Cryptography>
+<Quantum Entanglement Generation, corrects, Quantum Error Correction>
+<Quantum Error Correction, connectedTo, Optimization Problems with Quantum Annealing>
+<Quantum Error Correction, connectedTo, Superconducting Qubits>
+<Quantum Sensing, connectedTo, Laser Cooling for Ions>
+<Quantum Sensing, partOf, Quantum Sensing>
+<Quantum Software Development Kit, connectedTo, Interfacing Classical and Quantum Computers>
+<Quantum Software Development Kit, partOf, Quantum Software Development Kit>
+<Superconducting Qubits, connectedTo, Interfacing Classical and Quantum Computers>
+<Superconducting Qubits, educates, Optimization Problems with Quantum Annealing>
+<Trapped Ion Qubits, connectedTo, Optimization Problems with Quantum Annealing>
+<Trapped Ion Qubits, connectedTo, Quantum Entanglement Generation>
+<Vacuum Systems for Trapped Ions, connectedTo, Quantum Sensing>
+<Vacuum Systems for Trapped Ions, partOf, Vacuum Systems for Trapped Ions>
diff --git a/test/graphviz/graph_hard/graphviz_165.txt b/test/graphviz/graph_hard/graphviz_165.txt
new file mode 100644
index 0000000000000000000000000000000000000000..241e75094a04511cb409a2df9441d478cc671e5d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_165.txt
@@ -0,0 +1,42 @@
+<Cryogenic Systems for Qubits, connectedTo, Decoherence Mitigation>
+<Cryogenic Systems for Qubits, connectedTo, Quantum Key Distribution>
+<Decoherence Mitigation, connectedTo, Post_Quantum Cryptography>
+<Financial Modeling with Quantum Computing, connectedTo, Quantum Sensing>
+<Interfacing Classical and Quantum Computers, connectedTo, Quantum Coherence Management>
+<Interfacing Classical and Quantum Computers, partOf, Interfacing Classical and Quantum Computers>
+<Laser Cooling for Ions, connectedTo, Vacuum Systems for Trapped Ions>
+<Laser Cooling for Ions, partOf, Laser Cooling for Ions>
+<Material Science Simulations, connectedTo, Quantum Computing for AI>
+<Material Science Simulations, connectedTo, Quantum Entanglement Generation>
+<Material Science Simulations, connectedTo, Quantum Simulation>
+<Material Science Simulations, connectedTo, Quantum Supremacy Claims>
+<Microwave Control for Qubits, connectedTo, Material Science Simulations>
+<Microwave Control for Qubits, connectedTo, Quantum Computing for AI>
+<Optimization Problems with Quantum Annealing, connectedTo, Quantum Advantage Demonstration>
+<Photonic Qubits, factors, Quantum Teleportation Research>
+<Post_Quantum Cryptography, connectedTo, Financial Modeling with Quantum Computing>
+<Quantum Advantage Demonstration, connectedTo, Photonic Qubits>
+<Quantum Algorithm Development, connectedTo, Microwave Control for Qubits>
+<Quantum Algorithm Development, partOf, Quantum Algorithm Development>
+<Quantum Coherence Management, connectedTo, Quantum Algorithm Development>
+<Quantum Coherence Management, partOf, Quantum Coherence Management>
+<Quantum Computing Benchmarking, connectedTo, Cryogenic Systems for Qubits>
+<Quantum Computing Benchmarking, connectedTo, Material Science Simulations>
+<Quantum Computing Benchmarking, connectedTo, Post_Quantum Cryptography>
+<Quantum Computing Benchmarking, connectedTo, Quantum Computing for AI>
+<Quantum Computing Benchmarking, connectedTo, Quantum Sensing>
+<Quantum Computing Benchmarking, tests, Optimization Problems with Quantum Annealing>
+<Quantum Computing for AI, connectedTo, Quantum Simulation>
+<Quantum Computing in Drug Discovery, connectedTo, Laser Cooling for Ions>
+<Quantum Computing in Drug Discovery, partOf, Quantum Computing in Drug Discovery>
+<Quantum Key Distribution, computes, Interfacing Classical and Quantum Computers>
+<Quantum Key Distribution, partOf, Quantum Key Distribution>
+<Quantum Sensing, protects, Microwave Control for Qubits>
+<Quantum Simulation, connectedTo, Quantum Supremacy Claims>
+<Quantum Supremacy Claims, connectedTo, Quantum Computing in Drug Discovery>
+<Quantum Supremacy Claims, connectedTo, Quantum Entanglement Generation>
+<Quantum Teleportation Research, connectedTo, Cryogenic Systems for Qubits>
+<Trapped Ion Qubits, connectedTo, Quantum Simulation>
+<Trapped Ion Qubits, partOf, Trapped Ion Qubits>
+<Vacuum Systems for Trapped Ions, connectedTo, Trapped Ion Qubits>
+<Vacuum Systems for Trapped Ions, partOf, Vacuum Systems for Trapped Ions>
diff --git a/test/graphviz/graph_hard/graphviz_166.dot b/test/graphviz/graph_hard/graphviz_166.dot
new file mode 100644
index 0000000000000000000000000000000000000000..51e1d5ca547ab258ba8dcdb3f48763da08b56c3b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_166.dot
@@ -0,0 +1,86 @@
+digraph {
+	rankdir=LR
+	N0 [label="Software Development Kit Integration" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N1 [label="Headset Development" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+	N2 [label="Wearable AR Devices" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N3 [label="Facial Recognition in AR or VR" color="#FFDA4E" fillcolor="#FFE88D" shape=hexagon style=filled]
+	N4 [label="3D Model Creation" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+	N5 [label="Remote Collaboration Tools" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N6 [label="Virtual Reality Game Development" color="#AB47BC" fillcolor="#F3E5F5" shape=oval style=filled]
+	N7 [label="Spatial Audio Implementation" color="#AB47BC" fillcolor="#F3E5F5" shape=Mdiamond style=filled]
+	N8 [label="Cloud_based AR or VR Rendering" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+	N9 [label="Training Simulations" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N10 [label="Hardware Prototyping" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N11 [label="Educational Content Development" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N12 [label="Latency Reduction" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N13 [label="Comfort and Ergonomics Design" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N14 [label="Haptic Feedback Integration" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+	N15 [label="Hand Tracking and Interaction" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N16 [label="Neuro_VR Interfaces" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N17 [label="Virtual Tourism Experiences" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
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+		nest0_0 [label="User Interface Design" color="#BCB88A" fillcolor="#F5F5DC" shape=Mdiamond style=filled]
+		nest0_1 [label="Ethical Considerations in AR or VR" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+		nest0_2 [label="Environment Mapping" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
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+		nest1_0 [label="Performance Optimization" color="#BCB88A" fillcolor="#F5F5DC" shape=oval style=filled]
+		nest1_1 [label="Live Event Streaming in VR" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+		nest1_2 [label="Virtual Showrooms" color="#BCB88A" fillcolor="#F5F5DC" shape=parallelogram style=filled]
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+		nest1_1 -> nest1_2 [label=develops color="#000000" dir=forward penwidth=1.5 style=dashed]
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+	S1 -> N11 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [label=calibrates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> M0 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	M0 -> N14 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M2 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	M2 -> N10 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_166.txt b/test/graphviz/graph_hard/graphviz_166.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2462adf20ff39a86b4d2717a02d789db263572d3
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_166.txt
@@ -0,0 +1,45 @@
+<3D Model Creation, connectedTo, Remote Collaboration Tools>
+<3D Model Creation, connectedTo, Spatial Audio Implementation>
+<3D Model Creation, connectedTo, User Interface Design>
+<Cloud_based AR or VR Rendering, calibrates, Latency Reduction>
+<Cloud_based AR or VR Rendering, connectedTo, Educational Content Development>
+<Cloud_based AR or VR Rendering, connectedTo, Haptic Feedback Integration>
+<Cloud_based AR or VR Rendering, connectedTo, Neuro_VR Interfaces>
+<Cloud_based AR or VR Rendering, overlays, Hand Tracking and Interaction>
+<Cloud_based AR or VR Rendering, tests, Training Simulations>
+<Comfort and Ergonomics Design, connectedTo, Haptic Feedback Integration>
+<Educational Content Development, renders, Latency Reduction>
+<Environment Mapping, audits, Cloud_based AR or VR Rendering>
+<Environment Mapping, partOf, Environment Mapping>
+<Ethical Considerations in AR or VR, connectedTo, Environment Mapping>
+<Ethical Considerations in AR or VR, partOf, Ethical Considerations in AR or VR>
+<Facial Recognition in AR or VR, connectedTo, 3D Model Creation>
+<Facial Recognition in AR or VR, connectedTo, Haptic Feedback Integration>
+<Facial Recognition in AR or VR, connectedTo, Hardware Prototyping>
+<Hand Tracking and Interaction, connectedTo, Neuro_VR Interfaces>
+<Haptic Feedback Integration, connectedTo, Hand Tracking and Interaction>
+<Hardware Prototyping, connectedTo, Educational Content Development>
+<Headset Development, connectedTo, Haptic Feedback Integration>
+<Headset Development, connectedTo, Spatial Audio Implementation>
+<Headset Development, connectedTo, Wearable AR Devices>
+<Latency Reduction, connectedTo, Comfort and Ergonomics Design>
+<Latency Reduction, connectedTo, Haptic Feedback Integration>
+<Live Event Streaming in VR, develops, Virtual Showrooms>
+<Live Event Streaming in VR, partOf, Live Event Streaming in VR>
+<Neuro_VR Interfaces, connectedTo, Virtual Tourism Experiences>
+<Performance Optimization, connectedTo, Live Event Streaming in VR>
+<Performance Optimization, partOf, Performance Optimization>
+<Remote Collaboration Tools, programs, Virtual Reality Game Development>
+<Software Development Kit Integration, connectedTo, Headset Development>
+<Software Development Kit Integration, connectedTo, Spatial Audio Implementation>
+<Spatial Audio Implementation, connectedTo, Cloud_based AR or VR Rendering>
+<Training Simulations, connectedTo, Hardware Prototyping>
+<User Interface Design, connectedTo, Ethical Considerations in AR or VR>
+<User Interface Design, partOf, User Interface Design>
+<Virtual Reality Game Development, connectedTo, Hardware Prototyping>
+<Virtual Reality Game Development, connectedTo, Spatial Audio Implementation>
+<Virtual Showrooms, connectedTo, Cloud_based AR or VR Rendering>
+<Virtual Showrooms, partOf, Virtual Showrooms>
+<Wearable AR Devices, connectedTo, Facial Recognition in AR or VR>
+<Wearable AR Devices, connectedTo, Hardware Prototyping>
+<Wearable AR Devices, connectedTo, Performance Optimization>
diff --git a/test/graphviz/graph_hard/graphviz_167.txt b/test/graphviz/graph_hard/graphviz_167.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d8c1d2885fe4cb6ba4894b3f7c0dce7674d0b907
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_167.txt
@@ -0,0 +1,32 @@
+<3D Model Creation, generates, Medical Applications>
+<3D Model Creation, partOf, 3D Model Creation>
+<AR for Navigation, connectedTo, Comfort and Ergonomics Design>
+<AR for Navigation, connectedTo, Tracking System Calibration>
+<AR for Navigation, connectedTo, User Interface Design>
+<AR for Navigation, connectedTo, Virtual Tourism Experiences>
+<Augmented Reality App Development, connectedTo, Immersive Storytelling>
+<Comfort and Ergonomics Design, connectedTo, Retail Experience Enhancement>
+<Data Visualization in AR or VR, connectedTo, Augmented Reality App Development>
+<Environment Mapping, connectedTo, Virtual Showrooms>
+<Environment Mapping, partOf, Environment Mapping>
+<Headset Development, connectedTo, User Experience Testing>
+<Immersive Storytelling, connectedTo, AR for Navigation>
+<Medical Applications, connectedTo, Comfort and Ergonomics Design>
+<Medical Applications, partOf, Medical Applications>
+<Neuro_VR Interfaces, partOf, Neuro_VR Interfaces>
+<Neuro_VR Interfaces, trains, Environment Mapping>
+<Retail Experience Enhancement, connectedTo, Virtual Tourism Experiences>
+<Software Development Kit Integration, connectedTo, Neuro_VR Interfaces>
+<Software Development Kit Integration, partOf, Software Development Kit Integration>
+<User Experience Testing, collaborates, Comfort and Ergonomics Design>
+<User Experience Testing, connectedTo, 3D Model Creation>
+<User Experience Testing, connectedTo, AR for Navigation>
+<User Experience Testing, connectedTo, Data Visualization in AR or VR>
+<User Experience Testing, connectedTo, User Interface Design>
+<User Interface Design, connectedTo, Tracking System Calibration>
+<Virtual Showrooms, connectedTo, AR for Navigation>
+<Virtual Showrooms, partOf, Virtual Showrooms>
+<Virtual Tourism Experiences, connectedTo, Software Development Kit Integration>
+<Virtual Tourism Experiences, connectedTo, Virtual Showrooms>
+<Virtual Tourism Experiences, deploys, User Interface Design>
+<Virtual Tourism Experiences, monitors, Comfort and Ergonomics Design>
diff --git a/test/graphviz/graph_hard/graphviz_168.dot b/test/graphviz/graph_hard/graphviz_168.dot
new file mode 100644
index 0000000000000000000000000000000000000000..81f91826655702b50853dc58983128ad394005e9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_168.dot
@@ -0,0 +1,58 @@
+digraph {
+	rankdir=TD
+	N0 [label="Software Development Kit Integration" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N1 [label="Tracking System Calibration" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N2 [label="User Interface Design" color="#FFC107" fillcolor="#FFECB3" shape=diamond style=filled]
+	N3 [label="Retail Experience Enhancement" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N4 [label="Environment Mapping" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+	N5 [label="Training Simulations" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N6 [label="Educational Content Development" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N7 [label="Headset Development" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N8 [label="Medical Applications" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N9 [label="AR for Navigation" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	S0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="User Experience Testing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Field of View Optimization" color="#FFEB3B" fillcolor="#FFF9C4" shape=Mdiamond style=filled]
+		nest0_1 [label="Virtual Showrooms" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest0_2 [label="Facial Recognition in AR or VR" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+		nest0_3 [label="Hand Tracking and Interaction" color="#FFC107" fillcolor="#FFECB3" shape=folder style=filled]
+		nest0_0 -> nest0_1 [label=connects color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Comfort and Ergonomics Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Ethical Considerations in AR or VR" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+		nest1_1 [label="Neuro_VR Interfaces" color="#AED581" fillcolor="#F0F4C3" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N4 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [label=streamlines color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_168.txt b/test/graphviz/graph_hard/graphviz_168.txt
new file mode 100644
index 0000000000000000000000000000000000000000..568153d0af56ff09a2c30a6d6b35f684e86c0371
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_168.txt
@@ -0,0 +1,31 @@
+<Educational Content Development, connectedTo, Ethical Considerations in AR or VR>
+<Educational Content Development, connectedTo, Field of View Optimization>
+<Educational Content Development, connectedTo, Headset Development>
+<Environment Mapping, connectedTo, AR for Navigation>
+<Environment Mapping, connectedTo, Headset Development>
+<Environment Mapping, connectedTo, Training Simulations>
+<Environment Mapping, streamlines, Educational Content Development>
+<Ethical Considerations in AR or VR, connectedTo, Neuro_VR Interfaces>
+<Ethical Considerations in AR or VR, partOf, Ethical Considerations in AR or VR>
+<Facial Recognition in AR or VR, connectedTo, Hand Tracking and Interaction>
+<Facial Recognition in AR or VR, partOf, Facial Recognition in AR or VR>
+<Field of View Optimization, connects, Virtual Showrooms>
+<Field of View Optimization, partOf, Field of View Optimization>
+<Hand Tracking and Interaction, connectedTo, Environment Mapping>
+<Hand Tracking and Interaction, partOf, Hand Tracking and Interaction>
+<Headset Development, connectedTo, Medical Applications>
+<Medical Applications, connectedTo, AR for Navigation>
+<Neuro_VR Interfaces, connectedTo, Tracking System Calibration>
+<Neuro_VR Interfaces, partOf, Neuro_VR Interfaces>
+<Retail Experience Enhancement, connectedTo, Environment Mapping>
+<Software Development Kit Integration, connectedTo, AR for Navigation>
+<Software Development Kit Integration, connectedTo, Tracking System Calibration>
+<Tracking System Calibration, connectedTo, AR for Navigation>
+<Tracking System Calibration, connectedTo, Educational Content Development>
+<Tracking System Calibration, connectedTo, Training Simulations>
+<Tracking System Calibration, connectedTo, User Interface Design>
+<Training Simulations, connectedTo, AR for Navigation>
+<Training Simulations, connectedTo, Educational Content Development>
+<User Interface Design, connectedTo, Retail Experience Enhancement>
+<Virtual Showrooms, connectedTo, Facial Recognition in AR or VR>
+<Virtual Showrooms, partOf, Virtual Showrooms>
diff --git a/test/graphviz/graph_hard/graphviz_17.dot b/test/graphviz/graph_hard/graphviz_17.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a0f136f0c4172d00d2c4bc471b89bfbf08a090cb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_17.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=TD
+	N0 [label="Passenger Boarding Pass Issuance" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N1 [label="Vehicle Tracking" color="#4CAF50" fillcolor="#C8E6C9" shape=oval style=filled]
+	N2 [label="Location Input" color="#92C79A" fillcolor="#E8F0EA" shape=Mdiamond style=filled]
+	N3 [label="Route Diversion" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N4 [label="Maintenance Check" color="#FFDA4E" fillcolor="#FFE88D" shape=hexagon style=filled]
+	N5 [label="Security Check" color="#4CAF50" fillcolor="#C8E6C9" shape=oval style=filled]
+	N6 [label="Luggage Handling" color="#92C79A" fillcolor="#E8F0EA" shape=folder style=filled]
+	N7 [label="Vehicle Assignment" color="#FFDA4E" fillcolor="#FFE88D" shape=oval style=filled]
+	N8 [label="Fare Calculation" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N9 [label="Weather Impact Assessment" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N10 [label="Road Network Management" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N11 [label="Tunnel Monitoring" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N12 [label="Electric Vehicle Charging" color="#92C79A" fillcolor="#E8F0EA" shape=folder style=filled]
+	N13 [label="Intermodal Transfer" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#92C79A" fillcolor="#E8F0EA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Air Traffic Control" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Ride_sharing Request" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+		nest0_1 [label="Train Dispatch" color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+		nest0_2 [label="Route Optimization" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Parking Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Public Transport Ticketing" color="#92C79A" fillcolor="#E8F0EA" shape=oval style=filled]
+		nest1_1 [label="Accident Reconstruction" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+		nest1_2 [label="Ticket Purchase" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=rescues color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=updates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N7 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N11 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [label=audits color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_17.txt b/test/graphviz/graph_hard/graphviz_17.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1f8548788fdedb6c19837c249dd6f2415466e91b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_17.txt
@@ -0,0 +1,37 @@
+<Accident Reconstruction, connectedTo, Ticket Purchase>
+<Accident Reconstruction, partOf, Accident Reconstruction>
+<Electric Vehicle Charging, updates, Intermodal Transfer>
+<Fare Calculation, connectedTo, Weather Impact Assessment>
+<Location Input, connectedTo, Electric Vehicle Charging>
+<Location Input, connectedTo, Intermodal Transfer>
+<Location Input, connectedTo, Maintenance Check>
+<Location Input, connectedTo, Road Network Management>
+<Location Input, connectedTo, Route Diversion>
+<Location Input, connectedTo, Tunnel Monitoring>
+<Luggage Handling, connectedTo, Vehicle Assignment>
+<Maintenance Check, audits, Weather Impact Assessment>
+<Maintenance Check, connectedTo, Security Check>
+<Passenger Boarding Pass Issuance, connectedTo, Fare Calculation>
+<Passenger Boarding Pass Issuance, connectedTo, Vehicle Tracking>
+<Public Transport Ticketing, connectedTo, Accident Reconstruction>
+<Public Transport Ticketing, partOf, Public Transport Ticketing>
+<Ride_sharing Request, connectedTo, Train Dispatch>
+<Ride_sharing Request, partOf, Ride_sharing Request>
+<Road Network Management, connectedTo, Tunnel Monitoring>
+<Route Diversion, connectedTo, Fare Calculation>
+<Route Diversion, connectedTo, Weather Impact Assessment>
+<Route Diversion, rescues, Maintenance Check>
+<Route Optimization, connectedTo, Vehicle Assignment>
+<Route Optimization, partOf, Route Optimization>
+<Security Check, connectedTo, Luggage Handling>
+<Ticket Purchase, connectedTo, Tunnel Monitoring>
+<Ticket Purchase, partOf, Ticket Purchase>
+<Train Dispatch, connectedTo, Route Optimization>
+<Train Dispatch, partOf, Train Dispatch>
+<Tunnel Monitoring, connectedTo, Electric Vehicle Charging>
+<Vehicle Assignment, connectedTo, Fare Calculation>
+<Vehicle Tracking, connectedTo, Fare Calculation>
+<Vehicle Tracking, connectedTo, Location Input>
+<Weather Impact Assessment, connectedTo, Public Transport Ticketing>
+<Weather Impact Assessment, connectedTo, Ride_sharing Request>
+<Weather Impact Assessment, connectedTo, Road Network Management>
diff --git a/test/graphviz/graph_hard/graphviz_170.dot b/test/graphviz/graph_hard/graphviz_170.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7f19f11438993e3130c80aef9415a972a703040e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_170.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=TD
+	N0 [label="In_Game Economy Design" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N1 [label="User Interface Design" color="#C0CA33" fillcolor="#F9FBE7" shape=diamond style=filled]
+	N2 [label="Level Design" color="#C0CA33" fillcolor="#F9FBE7" shape=diamond style=filled]
+	N3 [label="Game Engine Customization" color="#C0CA33" fillcolor="#F9FBE7" shape=octagon style=filled]
+	N4 [label="Character Design" color="#CFCFCF" fillcolor="#F6F6F6" shape=plaintext style=filled]
+	N5 [label="PC Game Development" color="#CFCFCF" fillcolor="#F6F6F6" shape=oval style=filled]
+	N6 [label="Virtual Reality Gaming" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N7 [label="Sound Design" color="#3F51B5" fillcolor="#C5CAE9" shape=oval style=filled]
+	N8 [label="Community Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	S0 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Game Balancing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Monetization Strategy" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest0_1 [label="Asset Creation" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Quality Assurance Testing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Esports Event Organization" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest1_1 [label="User Experience Design" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+		nest1_2 [label=Programming color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+		nest1_3 [label="Voice Acting" color="#CFCFCF" fillcolor="#F6F6F6" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=advertises color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N4 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest1_0 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N2 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N5 -> S2 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N4 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_170.txt b/test/graphviz/graph_hard/graphviz_170.txt
new file mode 100644
index 0000000000000000000000000000000000000000..290c4a53340ef7f4790696fae411fc86a4ca97bb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_170.txt
@@ -0,0 +1,29 @@
+<Asset Creation, connectedTo, Character Design>
+<Asset Creation, partOf, Asset Creation>
+<Character Design, connectedTo, PC Game Development>
+<Esports Event Organization, connectedTo, User Experience Design>
+<Esports Event Organization, partOf, Esports Event Organization>
+<Game Engine Customization, connectedTo, Character Design>
+<In_Game Economy Design, connectedTo, Character Design>
+<In_Game Economy Design, connectedTo, User Interface Design>
+<Level Design, connectedTo, Character Design>
+<Level Design, connectedTo, Game Engine Customization>
+<Monetization Strategy, connectedTo, Asset Creation>
+<Monetization Strategy, partOf, Monetization Strategy>
+<PC Game Development, connectedTo, Community Management>
+<PC Game Development, connectedTo, Sound Design>
+<PC Game Development, connectedTo, Virtual Reality Gaming>
+<Programming, connectedTo, Voice Acting>
+<Programming, partOf, Programming>
+<Sound Design, connectedTo, Community Management>
+<User Experience Design, connectedTo, Programming>
+<User Experience Design, partOf, User Experience Design>
+<User Interface Design, connectedTo, Character Design>
+<User Interface Design, connectedTo, Esports Event Organization>
+<User Interface Design, connectedTo, Level Design>
+<User Interface Design, connectedTo, PC Game Development>
+<User Interface Design, connectedTo, Sound Design>
+<Virtual Reality Gaming, advertises, Sound Design>
+<Virtual Reality Gaming, connectedTo, Monetization Strategy>
+<Voice Acting, connectedTo, Level Design>
+<Voice Acting, partOf, Voice Acting>
diff --git a/test/graphviz/graph_hard/graphviz_171.dot b/test/graphviz/graph_hard/graphviz_171.dot
new file mode 100644
index 0000000000000000000000000000000000000000..adfe35df18442f5c9c416ccfd297ce72f232136c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_171.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=TD
+	N0 [label="Console Game Development" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N1 [label="Sound Design" color="#42A5F5" fillcolor="#F1F8FF" shape=plaintext style=filled]
+	N2 [label="Augmented Reality Gaming" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N3 [label="User Interface Design" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N4 [label="Network Code Optimization" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N5 [label=Storytelling color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N6 [label="Engine Development" color="#8C9EFF" fillcolor="#D3D7EB" shape=oval style=filled]
+	N7 [label=Localization color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N8 [label="Character Design" color="#8C9EFF" fillcolor="#D3D7EB" shape=parallelogram style=filled]
+	N9 [label="Game Analytics" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	S0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Marketing and Promotion" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="AI Behavior Programming" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest0_1 [label="Bug Fixing" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="In_Game Economy Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Game Performance Optimization" color="#42A5F5" fillcolor="#F1F8FF" shape=octagon style=filled]
+		nest1_1 [label="User Experience Design" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+		nest1_2 [label="Monetization Strategy" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=designs color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=writes color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [label=researches color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [label=engineers color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [label=competes color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N0 -> S1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N2 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N2 -> S2 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N4 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N6 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_171.txt b/test/graphviz/graph_hard/graphviz_171.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b0c9e9d97fa0ac151a6070c288ba3ddab7e25e71
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_171.txt
@@ -0,0 +1,34 @@
+<AI Behavior Programming, connectedTo, Bug Fixing>
+<AI Behavior Programming, partOf, AI Behavior Programming>
+<Augmented Reality Gaming, connectedTo, Engine Development>
+<Augmented Reality Gaming, connectedTo, Network Code Optimization>
+<Augmented Reality Gaming, connectedTo, Storytelling>
+<Augmented Reality Gaming, connectedTo, User Interface Design>
+<Augmented Reality Gaming, researches, Game Performance Optimization>
+<Bug Fixing, connectedTo, Network Code Optimization>
+<Bug Fixing, partOf, Bug Fixing>
+<Character Design, writes, Game Analytics>
+<Console Game Development, connectedTo, Augmented Reality Gaming>
+<Console Game Development, connectedTo, Character Design>
+<Console Game Development, connectedTo, Game Analytics>
+<Console Game Development, connectedTo, Sound Design>
+<Console Game Development, connectedTo, Storytelling>
+<Engine Development, designs, Localization>
+<Game Performance Optimization, connectedTo, User Experience Design>
+<Game Performance Optimization, partOf, Game Performance Optimization>
+<Localization, connectedTo, Character Design>
+<Monetization Strategy, connectedTo, Sound Design>
+<Monetization Strategy, partOf, Monetization Strategy>
+<Network Code Optimization, connectedTo, Storytelling>
+<Sound Design, connectedTo, Augmented Reality Gaming>
+<Sound Design, connectedTo, Character Design>
+<Storytelling, connectedTo, Character Design>
+<Storytelling, connectedTo, Engine Development>
+<User Experience Design, connectedTo, Monetization Strategy>
+<User Experience Design, partOf, User Experience Design>
+<User Interface Design, competes, Game Analytics>
+<User Interface Design, connectedTo, AI Behavior Programming>
+<User Interface Design, connectedTo, Character Design>
+<User Interface Design, connectedTo, Localization>
+<User Interface Design, connectedTo, Network Code Optimization>
+<User Interface Design, engineers, Storytelling>
diff --git a/test/graphviz/graph_hard/graphviz_172.dot b/test/graphviz/graph_hard/graphviz_172.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8ada32e63529240cc429a10aec91b12f671b1446
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_172.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=LR
+	N0 [label="Music Education" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label=Performance color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N2 [label="Music Distribution" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N3 [label="Sound System Design" color="#FFD54F" fillcolor="#FFF8E1" shape=plaintext style=filled]
+	N4 [label=Arrangement color="#FFD54F" fillcolor="#FFF8E1" shape=Mdiamond style=filled]
+	N5 [label="Lyric Writing" color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N6 [label=Recording color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N7 [label=Mixing color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N8 [label=Composition color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N9 [label="Instrumental Performance" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+	N10 [label="Record Label Operations" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N11 [label=Sampling color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	S0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Music Festival Organization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Tour Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+		nest0_1 [label="A&R" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+		nest0_2 [label="Music Licensing" color="#FFB74D" fillcolor="#FFF3E0" shape=folder style=filled]
+		nest0_0 -> nest0_1 [label=publishes color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Music Production" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Mastering color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+		nest1_1 [label="Music Theory Analysis" color="#FFB74D" fillcolor="#FFF3E0" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=engineers color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N1 [label=arranges color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N4 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [label=teaches color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [label=funds color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_172.txt b/test/graphviz/graph_hard/graphviz_172.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e3f7e59d2b9bc4304ff9b3db2acb7fbe54ef793b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_172.txt
@@ -0,0 +1,32 @@
+<A&R, connectedTo, Music Licensing>
+<A&R, partOf, A&R>
+<Arrangement, connectedTo, Lyric Writing>
+<Composition, engineers, Instrumental Performance>
+<Instrumental Performance, connectedTo, Record Label Operations>
+<Instrumental Performance, connectedTo, Tour Management>
+<Lyric Writing, connectedTo, Instrumental Performance>
+<Lyric Writing, connectedTo, Mastering>
+<Lyric Writing, connectedTo, Record Label Operations>
+<Lyric Writing, connectedTo, Recording>
+<Lyric Writing, teaches, Composition>
+<Mastering, connectedTo, Music Theory Analysis>
+<Mastering, partOf, Mastering>
+<Mixing, connectedTo, Composition>
+<Mixing, connectedTo, Instrumental Performance>
+<Music Distribution, connectedTo, Composition>
+<Music Distribution, connectedTo, Lyric Writing>
+<Music Distribution, connectedTo, Sound System Design>
+<Music Distribution, funds, Instrumental Performance>
+<Music Education, connectedTo, Instrumental Performance>
+<Music Education, connectedTo, Performance>
+<Music Licensing, arranges, Performance>
+<Music Licensing, partOf, Music Licensing>
+<Music Theory Analysis, connectedTo, Arrangement>
+<Music Theory Analysis, partOf, Music Theory Analysis>
+<Performance, connectedTo, Music Distribution>
+<Record Label Operations, connectedTo, Sampling>
+<Recording, connectedTo, Instrumental Performance>
+<Recording, connectedTo, Mixing>
+<Sound System Design, connectedTo, Arrangement>
+<Tour Management, partOf, Tour Management>
+<Tour Management, publishes, A&R>
diff --git a/test/graphviz/graph_hard/graphviz_173.dot b/test/graphviz/graph_hard/graphviz_173.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8c7a41f823dd0f85ee21657af275a0ca28183cb7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_173.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=TD
+	N0 [label="Music Therapy" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N1 [label="Concert Promotion" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N2 [label="Music Licensing" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+	N3 [label="Fan Engagement Strategy" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N4 [label="Lyric Writing" color="#388E3C" fillcolor="#C8E6C9" shape=parallelogram style=filled]
+	N5 [label="Copyright Management" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N6 [label="Music Theory Analysis" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N7 [label="Record Label Operations" color="#80DDEA" fillcolor="#D3F7F9" shape=folder style=filled]
+	N8 [label="Music Publishing" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N9 [label="Music Distribution" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N10 [label="Royalty Collection" color="#3F51B5" fillcolor="#C5CAE9" shape=oval style=filled]
+	N11 [label="Beat Making" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	S1 [label="" color="#388E3C" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Music Production" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Sampling color="#3F51B5" fillcolor="#C5CAE9" shape=plaintext style=filled]
+		nest0_1 [label="Artist Management" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
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+		nest1_0 [label="Streaming Platform Management" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+		nest1_1 [label=Songwriting color="#388E3C" fillcolor="#C8E6C9" shape=plaintext style=filled]
+		nest1_2 [label="Vocal Performance" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=audits color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=performs color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=scores color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [label=manages color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N8 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N7 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [label=reviews color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [label=sells color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> S2 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_176.txt b/test/graphviz/graph_hard/graphviz_176.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e8fedd5c13b551f077150c570f361a56574723ba
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_176.txt
@@ -0,0 +1,35 @@
+<Budget Management, connectedTo, Pre_production Planning>
+<Budget Management, partOf, Budget Management>
+<Color Grading, connectedTo, Crew Management>
+<Color Grading, connectedTo, Directing>
+<Color Grading, connectedTo, Production Accounting>
+<Color Grading, connectedTo, Remote Collaboration Tools>
+<Costume Design, connectedTo, Art Direction>
+<Crew Management, connectedTo, Editing>
+<Directing, connectedTo, Post_production Audio>
+<Editing, connectedTo, Green Production Practices>
+<Film Scoring, connectedTo, Budget Management>
+<Film Scoring, partOf, Film Scoring>
+<Green Production Practices, animates, Remote Collaboration Tools>
+<Green Production Practices, connectedTo, Art Direction>
+<Green Production Practices, connectedTo, Costume Design>
+<Green Production Practices, connectedTo, Post_production Audio>
+<Green Production Practices, connectedTo, Screenwriting Workshops>
+<Post_production Audio, connectedTo, Production Scheduling>
+<Post_production Audio, connectedTo, Storyboarding>
+<Post_production Audio, negotiates, Tax Incentive Management>
+<Pre_production Planning, connectedTo, Directing>
+<Pre_production Planning, connectedTo, Post_production Audio>
+<Production Accounting, connectedTo, Set Construction>
+<Production Accounting, distributes, Post_production Audio>
+<Production Scheduling, connectedTo, Sound Recording>
+<Production Scheduling, partOf, Production Scheduling>
+<Remote Collaboration Tools, composes, Costume Design>
+<Screenwriting Workshops, connectedTo, Pre_production Planning>
+<Screenwriting Workshops, connectedTo, Remote Collaboration Tools>
+<Set Construction, captures, Crew Management>
+<Sound Recording, connectedTo, Directing>
+<Sound Recording, partOf, Sound Recording>
+<Storyboarding, partOf, Storyboarding>
+<Storyboarding, records, Film Scoring>
+<Tax Incentive Management, connectedTo, Remote Collaboration Tools>
diff --git a/test/graphviz/graph_hard/graphviz_177.txt b/test/graphviz/graph_hard/graphviz_177.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1dcb08592afefb6341a020b2845d9952efe66636
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_177.txt
@@ -0,0 +1,38 @@
+<Archiving and Preservation, connectedTo, Post_production Audio>
+<Archiving and Preservation, screens, Special Effects>
+<Budget Management, connectedTo, Distribution Strategy>
+<Budget Management, partOf, Budget Management>
+<Color Grading, connectedTo, Film Scoring>
+<Digital Asset Management, connectedTo, Production Scheduling>
+<Digital Asset Management, connectedTo, Prop Management>
+<Digital Asset Management, connectedTo, Script Development>
+<Distribution Strategy, connectedTo, Green Production Practices>
+<Distribution Strategy, partOf, Distribution Strategy>
+<Film Scoring, connectedTo, Location Scouting>
+<Green Production Practices, connectedTo, Post_production Audio>
+<Insurance Management, connectedTo, Visual Effects>
+<Insurance Management, partOf, Insurance Management>
+<Makeup and Hair Design, markets, Insurance Management>
+<Makeup and Hair Design, partOf, Makeup and Hair Design>
+<Post_production Audio, licenses, Color Grading>
+<Pre_production Planning, connectedTo, Archiving and Preservation>
+<Production Scheduling, connectedTo, Budget Management>
+<Production Scheduling, connectedTo, Prop Management>
+<Prop Management, connectedTo, Set Construction>
+<Prop Management, connectedTo, Special Effects>
+<Prop Management, records, Virtual Production Techniques>
+<Screenwriting Workshops, connectedTo, Stunt Coordination>
+<Script Development, connectedTo, Makeup and Hair Design>
+<Script Development, partOf, Script Development>
+<Set Construction, connectedTo, Virtual Production Techniques>
+<Special Effects, connectedTo, Color Grading>
+<Special Effects, connectedTo, Location Scouting>
+<Special Effects, connectedTo, Screenwriting Workshops>
+<Stunt Coordination, promotes, Talent Negotiation>
+<Stunt Coordination, schedules, Post_production Audio>
+<Talent Negotiation, directs, Green Production Practices>
+<Tax Incentive Management, connectedTo, Digital Asset Management>
+<Tax Incentive Management, connectedTo, Prop Management>
+<Virtual Production Techniques, connectedTo, Pre_production Planning>
+<Visual Effects, connectedTo, Special Effects>
+<Visual Effects, partOf, Visual Effects>
diff --git a/test/graphviz/graph_hard/graphviz_179.dot b/test/graphviz/graph_hard/graphviz_179.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b3c0713f8d16ac61d8c0070714e2032c775f548b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_179.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=RL
+	N0 [label="Search Engine Optimization" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N1 [label="Podcast Production" color="#8C9EFF" fillcolor="#D3D7EB" shape=plaintext style=filled]
+	N2 [label="Transcribing Audio or Video" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N3 [label="Content Repurposing" color="#4DB6AC" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N4 [label="Interactive Content Development" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N5 [label="Performance Tracking" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+	N6 [label="Social Media Post Creation" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N7 [label="Interview Conduct" color="#AABEC6" fillcolor="#E0E6E9" shape=Mdiamond style=filled]
+	N8 [label=Photography color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N9 [label="Live Streaming Content" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+	N10 [label="Plagiarism Checking" color="#4DB6AC" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N11 [label=Branding color="#AABEC6" fillcolor="#E0E6E9" shape=hexagon style=filled]
+	N12 [label="Content Strategy Development" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N13 [label="Call to Action Design" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N14 [label="Distribution Planning" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N15 [label="Video Scripting" color="#4DB6AC" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N16 [label=Copywriting color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+		nest0_1 [label=Publishing color="#AABEC6" fillcolor="#E0E6E9" shape=oval style=filled]
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+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
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+		nest1_0 [label="Audio Recording" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_1 [label="Audience Analysis" color="#8C9EFF" fillcolor="#D3D7EB" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
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+	N5 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
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+	N15 -> N16 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N15 -> nest0_0 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N16 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
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+	N9 -> S0 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
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+	S0 -> N13 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_179.txt b/test/graphviz/graph_hard/graphviz_179.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e0dd46bdcc8b079e1fa0e339b628c4600efa07b8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_179.txt
@@ -0,0 +1,36 @@
+<Audience Analysis, connectedTo, Photography>
+<Audience Analysis, partOf, Audience Analysis>
+<Audience Engagement, connectedTo, Copywriting>
+<Audience Engagement, partOf, Audience Engagement>
+<Audio Recording, connectedTo, Audience Analysis>
+<Audio Recording, partOf, Audio Recording>
+<Branding, connectedTo, Content Strategy Development>
+<Call to Action Design, connectedTo, Distribution Planning>
+<Content Repurposing, connectedTo, Branding>
+<Content Repurposing, connectedTo, Distribution Planning>
+<Content Repurposing, connectedTo, Interactive Content Development>
+<Content Strategy Development, connectedTo, Call to Action Design>
+<Distribution Planning, connectedTo, Video Scripting>
+<Interactive Content Development, connectedTo, Performance Tracking>
+<Interview Conduct, connectedTo, Photography>
+<Live Streaming Content, connectedTo, Branding>
+<Live Streaming Content, connectedTo, Call to Action Design>
+<Live Streaming Content, connectedTo, Distribution Planning>
+<Live Streaming Content, connectedTo, Plagiarism Checking>
+<Performance Tracking, connectedTo, Social Media Post Creation>
+<Photography, connectedTo, Audio Recording>
+<Photography, connectedTo, Live Streaming Content>
+<Plagiarism Checking, connectedTo, Branding>
+<Podcast Production, connectedTo, Interactive Content Development>
+<Podcast Production, connectedTo, Transcribing Audio or Video>
+<Publishing, connectedTo, Audience Engagement>
+<Publishing, partOf, Publishing>
+<Search Engine Optimization, connectedTo, Interactive Content Development>
+<Search Engine Optimization, connectedTo, Podcast Production>
+<Social Media Post Creation, connectedTo, Interview Conduct>
+<Transcribing Audio or Video, connectedTo, Content Repurposing>
+<Transcribing Audio or Video, connectedTo, Interactive Content Development>
+<User_Generated Content Curation, connectedTo, Publishing>
+<User_Generated Content Curation, partOf, User_Generated Content Curation>
+<Video Scripting, connectedTo, Copywriting>
+<Video Scripting, connectedTo, User_Generated Content Curation>
diff --git a/test/graphviz/graph_hard/graphviz_180.txt b/test/graphviz/graph_hard/graphviz_180.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2e5a5281528f415f1384e8175b8ee20a804c2e43
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_180.txt
@@ -0,0 +1,42 @@
+<Animation, connectedTo, Plagiarism Checking>
+<Audience Engagement, connectedTo, Transcribing Audio or Video>
+<Audio Recording, connectedTo, Content Management System Operation>
+<Branding, connectedTo, Podcast Production>
+<Branding, partOf, Branding>
+<Call to Action Design, connectedTo, E_book Writing>
+<Content Localization, connectedTo, Interactive Content Development>
+<Content Management System Operation, connectedTo, Fact_Checking>
+<Content Strategy Development, connectedTo, Content Localization>
+<Distribution Planning, connectedTo, Newsletter Creation>
+<Distribution Planning, connectedTo, Photography>
+<Drafting Content, connectedTo, Content Strategy Development>
+<Drafting Content, partOf, Drafting Content>
+<E_book Writing, connectedTo, Content Strategy Development>
+<Influencer Collaboration, connectedTo, Keyword Research>
+<Influencer Collaboration, partOf, Influencer Collaboration>
+<Interactive Content Development, connectedTo, Keyword Research>
+<Keyword Research, connectedTo, Animation>
+<Newsletter Creation, connectedTo, Animation>
+<Newsletter Creation, connectedTo, Audio Recording>
+<Newsletter Creation, connectedTo, Content Management System Operation>
+<Newsletter Creation, connectedTo, Content Strategy Development>
+<Newsletter Creation, connectedTo, Research and Outline>
+<Newsletter Creation, connectedTo, Search Engine Optimization>
+<Newsletter Creation, connectedTo, Webinar Hosting>
+<Photography, connectedTo, Influencer Collaboration>
+<Photography, partOf, Photography>
+<Plagiarism Checking, connectedTo, Audio Recording>
+<Plagiarism Checking, connectedTo, Content Management System Operation>
+<Plagiarism Checking, connectedTo, Fact_Checking>
+<Podcast Production, connectedTo, Drafting Content>
+<Podcast Production, partOf, Podcast Production>
+<Research and Outline, connectedTo, Call to Action Design>
+<Search Engine Optimization, connectedTo, Branding>
+<Search Engine Optimization, partOf, Search Engine Optimization>
+<Transcribing Audio or Video, connectedTo, Research and Outline>
+<Transcribing Audio or Video, connectedTo, User_Generated Content Curation>
+<User_Generated Content Curation, connectedTo, Newsletter Creation>
+<User_Generated Content Curation, connectedTo, Video Scripting>
+<Video Scripting, connectedTo, Distribution Planning>
+<Video Scripting, connectedTo, Newsletter Creation>
+<Webinar Hosting, connectedTo, Research and Outline>
diff --git a/test/graphviz/graph_hard/graphviz_181.txt b/test/graphviz/graph_hard/graphviz_181.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4561e6ce1d69ba5c23e3c0c224fd4888ec231407
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_181.txt
@@ -0,0 +1,29 @@
+<Big Data Processing, connectedTo, Supply Chain Analytics>
+<Data Mining, connectedTo, Marketing Campaign Analysis>
+<Data Pipeline Development, connectedTo, Healthcare Data Analysis>
+<Data Pipeline Development, partOf, Data Pipeline Development>
+<Data Transformation, connectedTo, Data Visualization>
+<Data Transformation, partOf, Data Transformation>
+<Data Visualization, integrates, Data Warehouse Design>
+<Data Visualization, partOf, Data Visualization>
+<Data Warehouse Design, connectedTo, Prescriptive Analytics>
+<Healthcare Data Analysis, connectedTo, Data Mining>
+<Healthcare Data Analysis, connectedTo, Prescriptive Analytics>
+<Healthcare Data Analysis, partOf, Healthcare Data Analysis>
+<Machine Learning Integration, connectedTo, Data Transformation>
+<Machine Learning Integration, partOf, Machine Learning Integration>
+<Natural Language Processing for Data, accesses, Prescriptive Analytics>
+<Natural Language Processing for Data, connectedTo, Big Data Processing>
+<Natural Language Processing for Data, connectedTo, Marketing Campaign Analysis>
+<Prescriptive Analytics, connectedTo, Data Mining>
+<Prescriptive Analytics, connectedTo, Machine Learning Integration>
+<Prescriptive Analytics, connectedTo, Time Series Forecasting>
+<Real_time Analytics, connectedTo, Data Pipeline Development>
+<Real_time Analytics, partOf, Real_time Analytics>
+<Sentiment Analysis, connectedTo, Machine Learning Integration>
+<Sentiment Analysis, connectedTo, Natural Language Processing for Data>
+<Supply Chain Analytics, connectedTo, Data Mining>
+<Supply Chain Analytics, connectedTo, Marketing Campaign Analysis>
+<Supply Chain Analytics, secures, Data Warehouse Design>
+<Time Series Forecasting, connectedTo, Real_time Analytics>
+<Time Series Forecasting, partOf, Time Series Forecasting>
diff --git a/test/graphviz/graph_hard/graphviz_182.txt b/test/graphviz/graph_hard/graphviz_182.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1c2de785c6d0960ed043761297105258ec636f72
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_182.txt
@@ -0,0 +1,39 @@
+<Big Data Processing, connectedTo, Geospatial Analysis>
+<Big Data Processing, connectedTo, Operational Efficiency Metrics>
+<Business User Training on Analytics, connectedTo, Data Pipeline Development>
+<Data Governance, connectedTo, Business User Training on Analytics>
+<Data Governance, connectedTo, Operational Efficiency Metrics>
+<Data Governance, connectedTo, Sentiment Analysis>
+<Data Pipeline Development, connectedTo, Big Data Processing>
+<Data Security Best Practices, connectedTo, A or B Testing Analysis>
+<Data Security Best Practices, connectedTo, Data Governance>
+<Data Security Best Practices, connectedTo, Operational Efficiency Metrics>
+<Data Security Best Practices, governs, Business User Training on Analytics>
+<Data Storytelling, connectedTo, Data Warehouse Design>
+<Data Storytelling, partOf, Data Storytelling>
+<Data Warehouse Design, connectedTo, Data Security Best Practices>
+<ETL Process Management, connectedTo, Business User Training on Analytics>
+<ETL Process Management, connectedTo, HR Data Analytics>
+<ETL Process Management, connectedTo, Healthcare Data Analysis>
+<Exploratory Data Analysis, connectedTo, Prescriptive Analytics>
+<Exploratory Data Analysis, partOf, Exploratory Data Analysis>
+<Geospatial Analysis, connectedTo, Operational Efficiency Metrics>
+<HR Data Analytics, connectedTo, Predictive Analytics>
+<Healthcare Data Analysis, connectedTo, Data Storytelling>
+<Healthcare Data Analysis, partOf, Healthcare Data Analysis>
+<Marketing Campaign Analysis, connectedTo, Exploratory Data Analysis>
+<Marketing Campaign Analysis, partOf, Marketing Campaign Analysis>
+<Natural Language Processing for Data, connectedTo, Business User Training on Analytics>
+<Natural Language Processing for Data, connectedTo, ETL Process Management>
+<Operational Efficiency Metrics, connectedTo, Time Series Forecasting>
+<Predictive Analytics, connectedTo, A or B Testing Analysis>
+<Predictive Analytics, connectedTo, Business User Training on Analytics>
+<Predictive Analytics, connectedTo, Data Warehouse Design>
+<Predictive Analytics, connectedTo, Geospatial Analysis>
+<Predictive Analytics, connectedTo, Operational Efficiency Metrics>
+<Prescriptive Analytics, optimizes, A or B Testing Analysis>
+<Prescriptive Analytics, partOf, Prescriptive Analytics>
+<Sentiment Analysis, connectedTo, Marketing Campaign Analysis>
+<Sentiment Analysis, partOf, Sentiment Analysis>
+<Social Media Analytics, connectedTo, A or B Testing Analysis>
+<Time Series Forecasting, connectedTo, Social Media Analytics>
diff --git a/test/graphviz/graph_hard/graphviz_185.dot b/test/graphviz/graph_hard/graphviz_185.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c9724a652431f758655a165ad762af8d5e83d456
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_185.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=TD
+	N0 [label="Report Automation" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N1 [label="BI Platform Administration" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+	N2 [label="Data Quality Management" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+	N3 [label="Data Lineage Tracking" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N4 [label="Performance Monitoring" color="#73C6BC" fillcolor="#D0EFEE" shape=diamond style=filled]
+	N5 [label="Operational Efficiency Measurement" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N6 [label="Business Process Improvement" color="#73C6BC" fillcolor="#D0EFEE" shape=plaintext style=filled]
+	N7 [label="KPI Definition" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N8 [label="Data Warehousing" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N9 [label="Budget Performance Analysis" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N10 [label="Mobile BI Development" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N11 [label="Real_time BI Dashboards" color="#73C6BC" fillcolor="#D0EFEE" shape=plaintext style=filled]
+	N12 [label="ETL Development" color="#BCB88A" fillcolor="#F5F5DC" shape=Mdiamond style=filled]
+	N13 [label="Data Governance Policies" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N14 [label="Data Security in BI" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
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+		nest0_0 [label="Risk Assessment Reporting" color="#73C6BC" fillcolor="#D0EFEE" shape=Mdiamond style=filled]
+		nest0_1 [label="Embedded Analytics" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest0_2 [label="Executive Summary Reporting" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+		nest0_3 [label="Financial Performance Reporting" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
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+		nest0_2 -> nest0_3 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
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+		nest1_0 [label="Data Storytelling for Business" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+		nest1_1 [label="Regulatory Compliance Reporting" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
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+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
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+	N3 -> S1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
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+	N8 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
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+	M1 -> N10 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
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+	N3 -> M2 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N10 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_185.txt b/test/graphviz/graph_hard/graphviz_185.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fee35c5a30f3085c173a382252412545c3c9b2bc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_185.txt
@@ -0,0 +1,38 @@
+<BI Platform Administration, connectedTo, Data Quality Management>
+<BI Platform Administration, connectedTo, Mobile BI Development>
+<Budget Performance Analysis, connectedTo, Mobile BI Development>
+<Business Process Improvement, connectedTo, KPI Definition>
+<Data Governance Policies, connectedTo, Data Security in BI>
+<Data Governance Policies, connectedTo, Risk Assessment Reporting>
+<Data Lineage Tracking, connectedTo, Data Security in BI>
+<Data Lineage Tracking, connectedTo, Mobile BI Development>
+<Data Lineage Tracking, connectedTo, Operational Efficiency Measurement>
+<Data Lineage Tracking, connectedTo, Performance Monitoring>
+<Data Lineage Tracking, connectedTo, Real_time BI Dashboards>
+<Data Quality Management, connectedTo, Data Lineage Tracking>
+<Data Storytelling for Business, connectedTo, Regulatory Compliance Reporting>
+<Data Storytelling for Business, partOf, Data Storytelling for Business>
+<Data Warehousing, connectedTo, Budget Performance Analysis>
+<Data Warehousing, connectedTo, Data Storytelling for Business>
+<Data Warehousing, connectedTo, Mobile BI Development>
+<ETL Development, connectedTo, Data Governance Policies>
+<Embedded Analytics, connectedTo, Executive Summary Reporting>
+<Embedded Analytics, partOf, Embedded Analytics>
+<Executive Summary Reporting, connectedTo, Financial Performance Reporting>
+<Executive Summary Reporting, partOf, Executive Summary Reporting>
+<Financial Performance Reporting, connectedTo, Budget Performance Analysis>
+<Financial Performance Reporting, partOf, Financial Performance Reporting>
+<KPI Definition, connectedTo, Data Warehousing>
+<KPI Definition, connectedTo, Mobile BI Development>
+<Mobile BI Development, strategies, Real_time BI Dashboards>
+<Operational Efficiency Measurement, connectedTo, Business Process Improvement>
+<Performance Monitoring, connectedTo, Mobile BI Development>
+<Performance Monitoring, connectedTo, Operational Efficiency Measurement>
+<Real_time BI Dashboards, connectedTo, ETL Development>
+<Regulatory Compliance Reporting, connectedTo, Mobile BI Development>
+<Regulatory Compliance Reporting, partOf, Regulatory Compliance Reporting>
+<Report Automation, connectedTo, BI Platform Administration>
+<Report Automation, connectedTo, Data Governance Policies>
+<Report Automation, connectedTo, Mobile BI Development>
+<Risk Assessment Reporting, partOf, Risk Assessment Reporting>
+<Risk Assessment Reporting, transforms, Embedded Analytics>
diff --git a/test/graphviz/graph_hard/graphviz_186.dot b/test/graphviz/graph_hard/graphviz_186.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ff21fd5bad0947750f2df936140d56db1038b4a2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_186.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=BT
+	N0 [label="Data Warehousing" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N1 [label="Operational Efficiency Measurement" color="#FFE69C" fillcolor="#FFF9D4" shape=oval style=filled]
+	N2 [label="Supply Chain Optimization" color="#FFE69C" fillcolor="#FFF9D4" shape=plaintext style=filled]
+	N3 [label="OLAP Cube Creation" color="#FFE69C" fillcolor="#FFF9D4" shape=diamond style=filled]
+	N4 [label="Competitive Analysis" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N5 [label="Mobile BI Development" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N6 [label="Strategic Planning Support" color="#26A69A" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N7 [label="Regulatory Compliance Reporting" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N8 [label="Embedded Analytics" color="#82DAFF" fillcolor="#C8EDFF" shape=folder style=filled]
+	N9 [label="HR Analytics Dashboards" color="#82DAFF" fillcolor="#C8EDFF" shape=octagon style=filled]
+	N10 [label="Risk Assessment Reporting" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N11 [label="Cloud BI Solutions" color="#FFE69C" fillcolor="#FFF9D4" shape=parallelogram style=filled]
+	N12 [label="BI Platform Administration" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
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+	N14 [label="Data Storytelling for Business" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	S0 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+		nest0_1 [label="Data Lineage Tracking" color="#82DAFF" fillcolor="#C8EDFF" shape=folder style=filled]
+		nest0_2 [label="Dashboard Design" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
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+		nest0_1 -> nest0_2 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
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+	subgraph cluster_Group1 {
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+		nest1_1 [label="Customer Behavior Insights" color="#26A69A" fillcolor="#E0F2F1" shape=parallelogram style=filled]
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+		nest1_1 -> nest1_2 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
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diff --git a/test/graphviz/graph_hard/graphviz_187.dot b/test/graphviz/graph_hard/graphviz_187.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4b93308b93dd4d5c8269c7c966c8a4d7da92d433
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_187.dot
@@ -0,0 +1,86 @@
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+	rankdir=TD
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+	N1 [label="Loyalty Programs" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
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+	S1 -> N10 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [label="uses CRMs" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S2 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N16 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N15 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [label="direct mail" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N18 [label="optimizes conversions" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label="optimizes SEO" color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [label="launches campaigns" color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_187.txt b/test/graphviz/graph_hard/graphviz_187.txt
new file mode 100644
index 0000000000000000000000000000000000000000..80a28c26c9e62569277ad5c1035c8cb6f70d43af
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_187.txt
@@ -0,0 +1,43 @@
+<A or B Testing for Marketing, connectedTo, Customer Journey Mapping>
+<A or B Testing for Marketing, partOf, A or B Testing for Marketing>
+<Brand Reputation Management, connectedTo, Pricing Strategy>
+<Brand Strategy Development, connectedTo, Customer Segmentation>
+<Brand Strategy Development, partOf, Brand Strategy Development>
+<Customer Journey Mapping, connectedTo, Mobile Marketing>
+<Customer Journey Mapping, partOf, Customer Journey Mapping>
+<Customer Relationship Management, connectedTo, Marketing Analytics>
+<Customer Relationship Management, connectedTo, Podcast Marketing>
+<Customer Relationship Management, connectedTo, Pricing Strategy>
+<Customer Relationship Management, uses CRMs, Search Engine Marketing>
+<Customer Segmentation, connectedTo, Video Marketing>
+<Distribution Channel Management, connectedTo, Brand Strategy Development>
+<Distribution Channel Management, partOf, Distribution Channel Management>
+<Email Marketing, brands, Lead Generation>
+<Experiential Marketing, connectedTo, Brand Reputation Management>
+<Influencer Marketing, connectedTo, Target Audience Identification>
+<Lead Generation, connectedTo, Customer Segmentation>
+<Loyalty Programs, connectedTo, Customer Relationship Management>
+<Loyalty Programs, connectedTo, Marketing Analytics>
+<Loyalty Programs, optimizes SEO, Podcast Marketing>
+<Marketing Analytics, connectedTo, Search Engine Optimization>
+<Mobile Marketing, connectedTo, Customer Segmentation>
+<Mobile Marketing, connectedTo, Partnership Marketing>
+<Mobile Marketing, connectedTo, Video Marketing>
+<Mobile Marketing, direct mail, Lead Generation>
+<Mobile Marketing, optimizes conversions, Market Research>
+<Partnership Marketing, connectedTo, Email Marketing>
+<Podcast Marketing, connectedTo, Marketing Analytics>
+<Pricing Strategy, connectedTo, A or B Testing for Marketing>
+<Pricing Strategy, maps customer journeys, Mobile Marketing>
+<Search Engine Marketing, connectedTo, Market Research>
+<Search Engine Optimization, automates tasks, Influencer Marketing>
+<Target Audience Identification, connectedTo, Brand Reputation Management>
+<Target Audience Identification, connectedTo, Experiential Marketing>
+<Target Audience Identification, connectedTo, Mobile Marketing>
+<Target Audience Identification, connectedTo, Pricing Strategy>
+<Telemarketing, connectedTo, Loyalty Programs>
+<Telemarketing, connectedTo, Marketing Analytics>
+<Telemarketing, connectedTo, Podcast Marketing>
+<Telemarketing, launches campaigns, Marketing Analytics>
+<Video Marketing, connectedTo, Distribution Channel Management>
+<Video Marketing, connectedTo, Search Engine Marketing>
diff --git a/test/graphviz/graph_hard/graphviz_189.dot b/test/graphviz/graph_hard/graphviz_189.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f239cd652029de16212834f74b9222b76242dfc2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_189.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=TD
+	N0 [label="Pricing Strategy" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N1 [label="Competitive Analysis" color="#FFDA4E" fillcolor="#FFE88D" shape=plaintext style=filled]
+	N2 [label="Customer Segmentation" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N3 [label="Email Marketing" color="#9FA9E1" fillcolor="#D6D9F0" shape=plaintext style=filled]
+	N4 [label="Brand Strategy Development" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N5 [label="Experiential Marketing" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+	N6 [label="Campaign Performance Tracking" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N7 [label="A or B Testing for Marketing" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N8 [label="Event Marketing" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N9 [label="Social Media Marketing" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N10 [label="Marketing Budget Allocation" color="#FFDA4E" fillcolor="#FFE88D" shape=plaintext style=filled]
+	N11 [label="Lead Generation" color="#FFDA4E" fillcolor="#FFE88D" shape=plaintext style=filled]
+	N12 [label="Personalization Strategies" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N13 [label="Customer Journey Mapping" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N14 [label="Loyalty Programs" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	S0 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label=Telemarketing labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Market Research" color="#DCE775" fillcolor="#F9FBE7" shape=folder style=filled]
+		nest0_1 [label="Product Launch Strategy" color="#DCE775" fillcolor="#F9FBE7" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Website Design and Optimization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Guerilla Marketing" color="#FFDA4E" fillcolor="#FFE88D" shape=hexagon style=filled]
+		nest1_1 [label="Podcast Marketing" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+		nest1_2 [label="Public Relations" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N8 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N2 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [label="converts customers" color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N10 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_189.txt b/test/graphviz/graph_hard/graphviz_189.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d8f292eb075452f4d01e7341805be8dccb8ff041
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_189.txt
@@ -0,0 +1,37 @@
+<A or B Testing for Marketing, connectedTo, Event Marketing>
+<A or B Testing for Marketing, connectedTo, Guerilla Marketing>
+<A or B Testing for Marketing, connectedTo, Market Research>
+<Brand Strategy Development, connectedTo, A or B Testing for Marketing>
+<Brand Strategy Development, connectedTo, Event Marketing>
+<Brand Strategy Development, connectedTo, Experiential Marketing>
+<Brand Strategy Development, connectedTo, Social Media Marketing>
+<Campaign Performance Tracking, connectedTo, A or B Testing for Marketing>
+<Campaign Performance Tracking, connectedTo, Marketing Budget Allocation>
+<Competitive Analysis, connectedTo, Customer Segmentation>
+<Competitive Analysis, connectedTo, Experiential Marketing>
+<Customer Journey Mapping, connectedTo, Loyalty Programs>
+<Customer Segmentation, connectedTo, Email Marketing>
+<Customer Segmentation, connectedTo, Experiential Marketing>
+<Customer Segmentation, connectedTo, Marketing Budget Allocation>
+<Email Marketing, connectedTo, Brand Strategy Development>
+<Event Marketing, connectedTo, Social Media Marketing>
+<Experiential Marketing, connectedTo, Campaign Performance Tracking>
+<Guerilla Marketing, connectedTo, Podcast Marketing>
+<Guerilla Marketing, partOf, Guerilla Marketing>
+<Lead Generation, connectedTo, Personalization Strategies>
+<Market Research, connectedTo, Product Launch Strategy>
+<Market Research, partOf, Market Research>
+<Marketing Budget Allocation, connectedTo, Lead Generation>
+<Personalization Strategies, connectedTo, Customer Journey Mapping>
+<Podcast Marketing, connectedTo, Public Relations>
+<Podcast Marketing, partOf, Podcast Marketing>
+<Pricing Strategy, connectedTo, Competitive Analysis>
+<Pricing Strategy, connectedTo, Customer Journey Mapping>
+<Pricing Strategy, connectedTo, Customer Segmentation>
+<Pricing Strategy, connectedTo, Event Marketing>
+<Pricing Strategy, converts customers, A or B Testing for Marketing>
+<Product Launch Strategy, connectedTo, Competitive Analysis>
+<Product Launch Strategy, partOf, Product Launch Strategy>
+<Public Relations, connectedTo, Event Marketing>
+<Public Relations, partOf, Public Relations>
+<Social Media Marketing, connectedTo, Marketing Budget Allocation>
diff --git a/test/graphviz/graph_hard/graphviz_19.dot b/test/graphviz/graph_hard/graphviz_19.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9aaa3dfabfca5f43c835dc68187ce421f6f16547
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_19.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=RL
+	N0 [label="Circuit Breaker Operation" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N1 [label="Power Backup" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N2 [label="Renewable Integration" color="#FFEB3B" fillcolor="#FFF9C4" shape=folder style=filled]
+	N3 [label="Transmission Line Maintenance" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N4 [label="Smart Metering" color="#FFEB3B" fillcolor="#FFF9C4" shape=octagon style=filled]
+	N5 [label="Power Plant" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N6 [label="Substation Automation" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N7 [label="Load Distribution" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N8 [label="Usage Billing" color="#F44336" fillcolor="#FFCDD2" shape=Mdiamond style=filled]
+	N9 [label="Carbon Capture" color="#FFEB3B" fillcolor="#FFF9C4" shape=parallelogram style=filled]
+	N10 [label="Peak Shaving" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N11 [label="Wind Turbine Monitoring" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N12 [label="Cybersecurity for Grid" color="#FFEB3B" fillcolor="#FFF9C4" shape=Mdiamond style=filled]
+	N13 [label="Energy Efficiency Audit" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N14 [label="Demand Forecast" color="#FBC02D" fillcolor="#FFFDE7" shape=oval style=filled]
+	N15 [label="Power Purchase" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N16 [label="Grid Balancing" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N17 [label="Pipeline Monitoring" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N18 [label="Energy Storage" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Load Shedding" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Battery Monitoring" color="#FBC02D" fillcolor="#FFFDE7" shape=Mdiamond style=filled]
+		nest0_1 [label="Transformer Station" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Sensor Reading" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Energy Infrastructure Planning" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+		nest1_1 [label="Energy Market Analysis" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+		nest1_2 [label="Solar Panel Installation" color="#F44336" fillcolor="#FFCDD2" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=transmits color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N17 -> nest0_0 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N17 -> nest1_0 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N3 [label=licenses color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N11 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N15 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [label=alerts color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	M2 -> N5 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_19.txt b/test/graphviz/graph_hard/graphviz_19.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bf146132513f5031ccf0a77d5516d34191a68275
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_19.txt
@@ -0,0 +1,44 @@
+<Battery Monitoring, connectedTo, Transformer Station>
+<Battery Monitoring, partOf, Battery Monitoring>
+<Carbon Capture, connectedTo, Peak Shaving>
+<Circuit Breaker Operation, connectedTo, Load Distribution>
+<Circuit Breaker Operation, connectedTo, Power Backup>
+<Cybersecurity for Grid, connectedTo, Energy Efficiency Audit>
+<Demand Forecast, connectedTo, Power Purchase>
+<Energy Efficiency Audit, connectedTo, Demand Forecast>
+<Energy Infrastructure Planning, connectedTo, Energy Market Analysis>
+<Energy Infrastructure Planning, partOf, Energy Infrastructure Planning>
+<Energy Market Analysis, connectedTo, Solar Panel Installation>
+<Energy Market Analysis, partOf, Energy Market Analysis>
+<Grid Balancing, connectedTo, Pipeline Monitoring>
+<Load Distribution, connectedTo, Energy Efficiency Audit>
+<Load Distribution, connectedTo, Power Purchase>
+<Load Distribution, connectedTo, Usage Billing>
+<Load Distribution, connectedTo, Wind Turbine Monitoring>
+<Peak Shaving, transmits, Wind Turbine Monitoring>
+<Pipeline Monitoring, connectedTo, Battery Monitoring>
+<Pipeline Monitoring, connectedTo, Energy Infrastructure Planning>
+<Pipeline Monitoring, connectedTo, Energy Storage>
+<Power Backup, connectedTo, Renewable Integration>
+<Power Plant, alerts, Load Distribution>
+<Power Plant, connectedTo, Substation Automation>
+<Power Purchase, connectedTo, Grid Balancing>
+<Renewable Integration, connectedTo, Load Distribution>
+<Renewable Integration, connectedTo, Power Plant>
+<Renewable Integration, connectedTo, Transmission Line Maintenance>
+<Smart Metering, connectedTo, Power Plant>
+<Solar Panel Installation, licenses, Transmission Line Maintenance>
+<Solar Panel Installation, partOf, Solar Panel Installation>
+<Substation Automation, connectedTo, Demand Forecast>
+<Substation Automation, connectedTo, Load Distribution>
+<Substation Automation, connectedTo, Peak Shaving>
+<Substation Automation, connectedTo, Pipeline Monitoring>
+<Transformer Station, connectedTo, Usage Billing>
+<Transformer Station, partOf, Transformer Station>
+<Transmission Line Maintenance, connectedTo, Power Plant>
+<Transmission Line Maintenance, connectedTo, Smart Metering>
+<Usage Billing, connectedTo, Carbon Capture>
+<Wind Turbine Monitoring, connectedTo, Cybersecurity for Grid>
+<Wind Turbine Monitoring, connectedTo, Demand Forecast>
+<Wind Turbine Monitoring, connectedTo, Pipeline Monitoring>
+<Wind Turbine Monitoring, connectedTo, Power Purchase>
diff --git a/test/graphviz/graph_hard/graphviz_190.txt b/test/graphviz/graph_hard/graphviz_190.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b6e62917ef38c49303d21ea40a72b28ae7c90f33
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_190.txt
@@ -0,0 +1,35 @@
+<A or B Testing for Ads, connectedTo, Competitor Ad Analysis>
+<A or B Testing for Ads, connectedTo, Search Engine Ads>
+<Ad Creative Development, connectedTo, Audience Segmentation for Ads>
+<Audience Segmentation for Ads, connectedTo, Ad Copywriting>
+<Audience Targeting, connectedTo, Demographic Targeting>
+<Budget Management, connectedTo, Social Media Ads>
+<Budget Management, partOf, Budget Management>
+<Competitor Ad Analysis, connectedTo, Psychographic Targeting>
+<Competitor Ad Analysis, partOf, Competitor Ad Analysis>
+<Conversion Tracking, connectedTo, Outdoor Advertising>
+<Customer Acquisition Cost Analysis, connectedTo, Video Advertising>
+<Customer Acquisition Cost Analysis, partOf, Customer Acquisition Cost Analysis>
+<Demographic Targeting, connectedTo, Ad Creative Development>
+<Digital Advertising, connectedTo, A or B Testing for Ads>
+<Geo_Targeting, connectedTo, Digital Advertising>
+<Geo_Targeting, connectedTo, Social Media Ads>
+<Media Buying, connectedTo, Audience Targeting>
+<Media Buying, connectedTo, Demographic Targeting>
+<Media Buying, connectedTo, Geo_Targeting>
+<Media Buying, connectedTo, Social Media Ads>
+<Outdoor Advertising, connectedTo, Programmatic Advertising>
+<Programmatic Advertising, connectedTo, Media Buying>
+<Programmatic Advertising, connectedTo, Social Media Ads>
+<Psychographic Targeting, connectedTo, Television Advertising>
+<Psychographic Targeting, partOf, Psychographic Targeting>
+<Search Engine Ads, connectedTo, Social Media Ads>
+<Social Media Ads, connectedTo, Ad Creative Development>
+<Social Media Ads, connectedTo, Audience Segmentation for Ads>
+<Social Media Ads, connectedTo, Audience Targeting>
+<Social Media Ads, connectedTo, Customer Acquisition Cost Analysis>
+<Social Media Ads, connectedTo, Demographic Targeting>
+<Television Advertising, connectedTo, Geo_Targeting>
+<Television Advertising, partOf, Television Advertising>
+<Video Advertising, connectedTo, Budget Management>
+<Video Advertising, partOf, Video Advertising>
diff --git a/test/graphviz/graph_hard/graphviz_191.dot b/test/graphviz/graph_hard/graphviz_191.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8e2d5e44441e47b015b6ebf24b9dd6323d6afc6b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_191.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=BT
+	N0 [label="Privacy Concerns in Ads" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N1 [label="A or B Testing for Ads" color="#80DDEA" fillcolor="#D3F7F9" shape=plaintext style=filled]
+	N2 [label="Brand Awareness Campaigns" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+	N3 [label=Geo_Targeting color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N4 [label="Media Buying" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N5 [label="Ad Creative Development" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N6 [label="Regulatory Compliance for Ads" color="#A1887F" fillcolor="#EFEBE9" shape=plaintext style=filled]
+	N7 [label="Native Advertising" color="#A1887F" fillcolor="#EFEBE9" shape=plaintext style=filled]
+	N8 [label="Print Advertising" color="#A1887F" fillcolor="#EFEBE9" shape=diamond style=filled]
+	N9 [label="Ad Analytics Reporting" color="#80DDEA" fillcolor="#D3F7F9" shape=diamond style=filled]
+	N10 [label="Radio Advertising" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	S0 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Video Advertising" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Campaign Planning" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+		nest0_1 [label="Search Engine Ads" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+		nest0_2 [label="Conversion Tracking" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+		nest0_3 [label="Outdoor Advertising" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [label="programmatic ads" color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Retargeting Campaigns" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Display Advertising" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+		nest1_1 [label="Visual Design for Ads" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+		nest1_2 [label="Demographic Targeting" color="#EAEFA5" fillcolor="#FDFCEB" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label="builds awareness" color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label="designs interactive ads" color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [label="interprets analytics" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N3 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [label="generates responses" color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N4 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_192.dot b/test/graphviz/graph_hard/graphviz_192.dot
new file mode 100644
index 0000000000000000000000000000000000000000..996c41dcae185c269472550e19a9e6e0a2c818da
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_192.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=BT
+	N0 [label="Retargeting Campaigns" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Audience Targeting" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N2 [label=Geo_Targeting color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N3 [label="A or B Testing for Ads" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N4 [label="Regulatory Compliance for Ads" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N5 [label="Interactive Ad Formats" color="#FFE69C" fillcolor="#FFF9D4" shape=diamond style=filled]
+	N6 [label="Radio Advertising" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N7 [label="Customer Acquisition Cost Analysis" color="#FBC02D" fillcolor="#FFFDE7" shape=folder style=filled]
+	N8 [label="Video Advertising" color="#FBC02D" fillcolor="#FFFDE7" shape=Mdiamond style=filled]
+	N9 [label="Psychographic Targeting" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N10 [label="Demographic Targeting" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N11 [label="Programmatic Advertising" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N12 [label="Search Engine Ads" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N13 [label="Ad Network Management" color="#FFE69C" fillcolor="#FFF9D4" shape=oval style=filled]
+	N14 [label="Social Media Ads" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	S0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Display Advertising" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Outdoor Advertising" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_1 [label="Conversion Tracking" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+		nest0_2 [label="Campaign Planning" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+		nest0_3 [label="Return on Ad Spend Calculation" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Privacy Concerns in Ads" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Fraud Detection in Ads" color="#BCB88A" fillcolor="#F5F5DC" shape=plaintext style=filled]
+		nest1_1 [label="Performance Tracking" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label="search ads" color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="interprets analytics" color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N13 [label="segments audiences" color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_192.txt b/test/graphviz/graph_hard/graphviz_192.txt
new file mode 100644
index 0000000000000000000000000000000000000000..75d815c7c6a594988585f5eaa4b97e8e220f0999
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_192.txt
@@ -0,0 +1,37 @@
+<A or B Testing for Ads, connectedTo, Regulatory Compliance for Ads>
+<Ad Network Management, connectedTo, Social Media Ads>
+<Audience Targeting, connectedTo, Geo_Targeting>
+<Audience Targeting, connectedTo, Regulatory Compliance for Ads>
+<Campaign Planning, connectedTo, Return on Ad Spend Calculation>
+<Campaign Planning, partOf, Campaign Planning>
+<Conversion Tracking, connectedTo, Campaign Planning>
+<Conversion Tracking, partOf, Conversion Tracking>
+<Customer Acquisition Cost Analysis, interprets analytics, Video Advertising>
+<Demographic Targeting, connectedTo, Programmatic Advertising>
+<Fraud Detection in Ads, connectedTo, Performance Tracking>
+<Fraud Detection in Ads, partOf, Fraud Detection in Ads>
+<Geo_Targeting, connectedTo, A or B Testing for Ads>
+<Geo_Targeting, connectedTo, Regulatory Compliance for Ads>
+<Interactive Ad Formats, connectedTo, Radio Advertising>
+<Outdoor Advertising, connectedTo, Conversion Tracking>
+<Outdoor Advertising, partOf, Outdoor Advertising>
+<Performance Tracking, connectedTo, Ad Network Management>
+<Performance Tracking, partOf, Performance Tracking>
+<Programmatic Advertising, connectedTo, Search Engine Ads>
+<Psychographic Targeting, connectedTo, Demographic Targeting>
+<Radio Advertising, connectedTo, Customer Acquisition Cost Analysis>
+<Radio Advertising, connectedTo, Demographic Targeting>
+<Radio Advertising, connectedTo, Fraud Detection in Ads>
+<Radio Advertising, connectedTo, Programmatic Advertising>
+<Radio Advertising, connectedTo, Social Media Ads>
+<Regulatory Compliance for Ads, connectedTo, Psychographic Targeting>
+<Regulatory Compliance for Ads, connectedTo, Radio Advertising>
+<Regulatory Compliance for Ads, connectedTo, Social Media Ads>
+<Regulatory Compliance for Ads, search ads, Interactive Ad Formats>
+<Retargeting Campaigns, connectedTo, Audience Targeting>
+<Retargeting Campaigns, connectedTo, Regulatory Compliance for Ads>
+<Return on Ad Spend Calculation, partOf, Return on Ad Spend Calculation>
+<Return on Ad Spend Calculation, segments audiences, Ad Network Management>
+<Search Engine Ads, connectedTo, Ad Network Management>
+<Video Advertising, connectedTo, Outdoor Advertising>
+<Video Advertising, connectedTo, Psychographic Targeting>
diff --git a/test/graphviz/graph_hard/graphviz_193.dot b/test/graphviz/graph_hard/graphviz_193.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e5d6f0df82f58a9621878b37281f88a5e89cf84e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_193.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=RL
+	N0 [label="Wallet Management" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N1 [label="Consensus Mechanism Development" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+	N2 [label="Energy Trading on Blockchain" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N3 [label="Public Blockchain Deployment" color="#6EB76D" fillcolor="#E9F7E8" shape=octagon style=filled]
+	N4 [label="Interoperability Solutions" color="#8C9EFF" fillcolor="#D3D7EB" shape=oval style=filled]
+	N5 [label="Blockchain Node Operation" color="#4DD0E1" fillcolor="#C9F0F0" shape=Mdiamond style=filled]
+	N6 [label="Financial Asset Tokenization" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N7 [label="Private Blockchain Implementation" color="#4DD0E1" fillcolor="#C9F0F0" shape=octagon style=filled]
+	N8 [label="Governance Models for Blockchains" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+	N9 [label="Cross_Border Payments" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+	N10 [label="Sharding Implementation" color="#6EB76D" fillcolor="#E9F7E8" shape=oval style=filled]
+	N11 [label="Security Auditing for Blockchains" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N12 [label="Non_Fungible Token Creation" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Scalability Solutions" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Consortium Blockchain Setup" color="#8C9EFF" fillcolor="#D3D7EB" shape=plaintext style=filled]
+		nest0_1 [label="Enterprise Blockchain Solutions" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest0_2 [label="Zero_Knowledge Proofs" color="#6EB76D" fillcolor="#E9F7E8" shape=plaintext style=filled]
+		nest0_3 [label="Voting Systems on Blockchain" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Cross_Chain Bridges" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Distributed Ledger Technology" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+		nest1_1 [label="Identity Verification on Blockchain" color="#6EB76D" fillcolor="#E9F7E8" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label="manages real estate" color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
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+	N4 -> N5 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N3 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	M1 -> N10 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_194.dot b/test/graphviz/graph_hard/graphviz_194.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8855900d212305aeac18cba626581ba0a6f7d4c9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_194.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=TD
+	N0 [label="Sidechains and Layer 2 Solutions" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N1 [label="Healthcare Data Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=octagon style=filled]
+	N2 [label="Security Auditing for Blockchains" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N3 [label="Real Estate Tokenization" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N4 [label="Supply Chain Traceability" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N5 [label="Distributed Ledger Technology" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N6 [label="Decentralized Finance Protocols" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N7 [label="Energy Trading on Blockchain" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N8 [label="Blockchain Node Operation" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N9 [label="Zero_Knowledge Proofs" color="#AED581" fillcolor="#F0F4C3" shape=Mdiamond style=filled]
+	N10 [label="Scalability Solutions" color="#AED581" fillcolor="#F0F4C3" shape=folder style=filled]
+	N11 [label="Transaction Verification" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N12 [label="Regulatory Compliance for Blockchain" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N13 [label="Sharding Implementation" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	S0 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Consortium Blockchain Setup" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Gaming on Blockchain" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+		nest0_1 [label="Financial Asset Tokenization" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+		nest0_2 [label="Security Token Offerings" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+		nest0_3 [label="Consensus Mechanism Development" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Decentralized Applications Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Wallet Management" color="#FFE470" fillcolor="#FFFAE0" shape=plaintext style=filled]
+		nest1_1 [label="Initial Coin Offerings" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+		nest1_2 [label="Decentralized Network Design" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+		nest1_3 [label="Oracles Integration" color="#FFE470" fillcolor="#FFFAE0" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [label="educates users" color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label="generates hashes" color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N10 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest1_0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> S2 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [label="verifies transactions" color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N6 -> M2 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	M2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_194.txt b/test/graphviz/graph_hard/graphviz_194.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d509b795d8ff2f4bfd126a1d30a44337596d495d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_194.txt
@@ -0,0 +1,43 @@
+<Blockchain Node Operation, connectedTo, Regulatory Compliance for Blockchain>
+<Blockchain Node Operation, connectedTo, Zero_Knowledge Proofs>
+<Consensus Mechanism Development, connectedTo, Scalability Solutions>
+<Consensus Mechanism Development, partOf, Consensus Mechanism Development>
+<Decentralized Finance Protocols, connectedTo, Blockchain Node Operation>
+<Decentralized Finance Protocols, connectedTo, Energy Trading on Blockchain>
+<Decentralized Network Design, educates users, Oracles Integration>
+<Decentralized Network Design, partOf, Decentralized Network Design>
+<Distributed Ledger Technology, connectedTo, Decentralized Finance Protocols>
+<Distributed Ledger Technology, connectedTo, Regulatory Compliance for Blockchain>
+<Energy Trading on Blockchain, connectedTo, Blockchain Node Operation>
+<Financial Asset Tokenization, connectedTo, Security Token Offerings>
+<Financial Asset Tokenization, partOf, Financial Asset Tokenization>
+<Gaming on Blockchain, connectedTo, Financial Asset Tokenization>
+<Gaming on Blockchain, partOf, Gaming on Blockchain>
+<Healthcare Data Management, connectedTo, Gaming on Blockchain>
+<Healthcare Data Management, connectedTo, Real Estate Tokenization>
+<Healthcare Data Management, connectedTo, Wallet Management>
+<Healthcare Data Management, generates hashes, Security Auditing for Blockchains>
+<Initial Coin Offerings, connectedTo, Decentralized Network Design>
+<Initial Coin Offerings, partOf, Initial Coin Offerings>
+<Oracles Integration, connectedTo, Zero_Knowledge Proofs>
+<Oracles Integration, partOf, Oracles Integration>
+<Real Estate Tokenization, connectedTo, Blockchain Node Operation>
+<Real Estate Tokenization, connectedTo, Supply Chain Traceability>
+<Regulatory Compliance for Blockchain, connectedTo, Sharding Implementation>
+<Scalability Solutions, connectedTo, Regulatory Compliance for Blockchain>
+<Scalability Solutions, connectedTo, Transaction Verification>
+<Security Auditing for Blockchains, connectedTo, Real Estate Tokenization>
+<Security Auditing for Blockchains, verifies transactions, Blockchain Node Operation>
+<Security Token Offerings, connectedTo, Consensus Mechanism Development>
+<Security Token Offerings, partOf, Security Token Offerings>
+<Sidechains and Layer 2 Solutions, connectedTo, Healthcare Data Management>
+<Sidechains and Layer 2 Solutions, connectedTo, Real Estate Tokenization>
+<Supply Chain Traceability, connectedTo, Blockchain Node Operation>
+<Supply Chain Traceability, connectedTo, Distributed Ledger Technology>
+<Supply Chain Traceability, connectedTo, Energy Trading on Blockchain>
+<Supply Chain Traceability, connectedTo, Regulatory Compliance for Blockchain>
+<Supply Chain Traceability, connectedTo, Sharding Implementation>
+<Transaction Verification, connectedTo, Regulatory Compliance for Blockchain>
+<Wallet Management, connectedTo, Initial Coin Offerings>
+<Wallet Management, partOf, Wallet Management>
+<Zero_Knowledge Proofs, connectedTo, Scalability Solutions>
diff --git a/test/graphviz/graph_hard/graphviz_196.dot b/test/graphviz/graph_hard/graphviz_196.dot
new file mode 100644
index 0000000000000000000000000000000000000000..74e252950463dba7b6edf0a34d3d2d3246db7ddb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_196.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=LR
+	N0 [label="Decentralized Autonomous Organizations" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N1 [label="Mining Algorithm Design" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N2 [label="Cross_chain Swaps" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N3 [label="Tax Reporting for Crypto" color="#388E3C" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N4 [label="GameFi Development" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N5 [label="Cold Storage Solutions" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N6 [label="Lending and Borrowing Protocols" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N7 [label="Blockchain Explorers" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N8 [label="Fraud Prevention" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N9 [label="Interoperability Solutions" color="#6FE1D5" fillcolor="#C9EFEC" shape=plaintext style=filled]
+	N10 [label="Initial Exchange Offering" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N11 [label="KYC or AML Procedures" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N12 [label="Key Management" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N13 [label="Airdrop Campaigns" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N14 [label="Venture Capital Funding" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N15 [label="Hot Wallet Security" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	S0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Fiat On or Off Ramps" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Web3 Integration" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+		nest0_1 [label="Transaction Processing" color="#FFF8A6" fillcolor="#FFFDE0" shape=folder style=filled]
+		nest0_2 [label="Portfolio Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest0_3 [label="Exchange Listing" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [label="manages portfolios" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Token Generation Event" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Blockchain Integration" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest1_1 [label="Smart Contract Auditing" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+		nest1_2 [label="Community Building" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+		nest1_3 [label="Yield Farming" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="integrates fiat" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label="calculates taxes" color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label="conducts IEOs" color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [label="enables swaps" color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N11 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N14 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [label="performs KYCs" color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [label="stakes assets" color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label="facilitates trades" color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> M2 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M2 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	M2 -> N13 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_198.dot b/test/graphviz/graph_hard/graphviz_198.dot
new file mode 100644
index 0000000000000000000000000000000000000000..85fe0dd0effe2bceff54c31e6bbd2c31d1ea65bc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_198.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=TD
+	N0 [label="Decentralized Exchange Operation" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N1 [label="Cryptocurrency Education" color="#A1D7CD" fillcolor="#EDF5F3" shape=folder style=filled]
+	N2 [label="Initial Exchange Offering" color="#FF8A65" fillcolor="#FBE9E7" shape=Mdiamond style=filled]
+	N3 [label="Token Generation Event" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N4 [label="Market Analysis" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N5 [label="Web3 Integration" color="#A1D7CD" fillcolor="#EDF5F3" shape=octagon style=filled]
+	N6 [label="Transaction Processing" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N7 [label="Venture Capital Funding" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N8 [label="Hot Wallet Security" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N9 [label="Yield Farming" color="#AABEC6" fillcolor="#E0E6E9" shape=octagon style=filled]
+	N10 [label="Tax Reporting for Crypto" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+	N11 [label="Key Management" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N12 [label="Stablecoin Design" color="#A1D7CD" fillcolor="#EDF5F3" shape=Mdiamond style=filled]
+	N13 [label="Legal Advisory for Crypto" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N14 [label="Cryptocurrency Trading Bots" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N15 [label="Airdrop Campaigns" color="#A1D7CD" fillcolor="#EDF5F3" shape=plaintext style=filled]
+	N16 [label="Blockchain Integration" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N17 [label="Coin Creation" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	S0 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="GameFi Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Lending and Borrowing Protocols" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest0_1 [label="Blockchain Explorers" color="#FF8A65" fillcolor="#FBE9E7" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Cross_chain Swaps" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="KYC or AML Procedures" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+		nest1_1 [label="Custodial Services" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+		nest1_2 [label="Interoperability Solutions" color="#AABEC6" fillcolor="#E0E6E9" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N15 -> nest0_0 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N11 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N17 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S0 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N10 -> M0 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	M0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> M1 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	M1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M2 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	M2 -> N17 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_198.txt b/test/graphviz/graph_hard/graphviz_198.txt
new file mode 100644
index 0000000000000000000000000000000000000000..179fe4681d68973ca346b4a1070bf6260a7b48c2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_198.txt
@@ -0,0 +1,42 @@
+<Airdrop Campaigns, connectedTo, Blockchain Integration>
+<Airdrop Campaigns, connectedTo, Lending and Borrowing Protocols>
+<Blockchain Explorers, connectedTo, Key Management>
+<Blockchain Explorers, partOf, Blockchain Explorers>
+<Blockchain Integration, connectedTo, Coin Creation>
+<Cryptocurrency Education, connectedTo, Initial Exchange Offering>
+<Cryptocurrency Trading Bots, connectedTo, Airdrop Campaigns>
+<Custodial Services, connectedTo, Interoperability Solutions>
+<Custodial Services, partOf, Custodial Services>
+<Decentralized Exchange Operation, connectedTo, Blockchain Integration>
+<Decentralized Exchange Operation, connectedTo, Cryptocurrency Education>
+<Hot Wallet Security, connectedTo, Yield Farming>
+<Initial Exchange Offering, connectedTo, Blockchain Integration>
+<Initial Exchange Offering, connectedTo, KYC or AML Procedures>
+<Initial Exchange Offering, connectedTo, Token Generation Event>
+<Interoperability Solutions, connectedTo, Coin Creation>
+<Interoperability Solutions, partOf, Interoperability Solutions>
+<KYC or AML Procedures, connectedTo, Custodial Services>
+<KYC or AML Procedures, partOf, KYC or AML Procedures>
+<Key Management, connectedTo, Blockchain Integration>
+<Key Management, connectedTo, Stablecoin Design>
+<Legal Advisory for Crypto, connectedTo, Cryptocurrency Trading Bots>
+<Lending and Borrowing Protocols, connectedTo, Blockchain Explorers>
+<Lending and Borrowing Protocols, partOf, Lending and Borrowing Protocols>
+<Market Analysis, connectedTo, Coin Creation>
+<Market Analysis, connectedTo, Stablecoin Design>
+<Market Analysis, connectedTo, Web3 Integration>
+<Stablecoin Design, connectedTo, Legal Advisory for Crypto>
+<Tax Reporting for Crypto, connectedTo, Key Management>
+<Tax Reporting for Crypto, connectedTo, Stablecoin Design>
+<Token Generation Event, connectedTo, Market Analysis>
+<Transaction Processing, connectedTo, Coin Creation>
+<Transaction Processing, connectedTo, Stablecoin Design>
+<Transaction Processing, connectedTo, Venture Capital Funding>
+<Venture Capital Funding, connectedTo, Blockchain Integration>
+<Venture Capital Funding, connectedTo, Hot Wallet Security>
+<Web3 Integration, connectedTo, Transaction Processing>
+<Yield Farming, connectedTo, Airdrop Campaigns>
+<Yield Farming, connectedTo, Cryptocurrency Trading Bots>
+<Yield Farming, connectedTo, Key Management>
+<Yield Farming, connectedTo, Stablecoin Design>
+<Yield Farming, connectedTo, Tax Reporting for Crypto>
diff --git a/test/graphviz/graph_hard/graphviz_199.dot b/test/graphviz/graph_hard/graphviz_199.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9598ee7e2927e93115504bd9e0f9ce6dacffb51d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_199.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=BT
+	N0 [label="Tax Implications of Crowdfunding" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N1 [label="Investor Verification" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N2 [label="Campaign Creation" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N3 [label="Social Media Promotion" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N4 [label="Legal Compliance" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N5 [label="Press Outreach" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N6 [label="Funding Period Management" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N7 [label="Logistics for Rewards" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N8 [label="Email List Building" color="#BDBDBD" fillcolor="#F5F5F5" shape=diamond style=filled]
+	N9 [label="Community Building" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N10 [label="Goal Setting" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N11 [label="Securities Regulations Adherence" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	S0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Fulfillment Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Donation_Based Crowdfunding" color="#6FE1D5" fillcolor="#C9EFEC" shape=diamond style=filled]
+		nest0_1 [label="Platform Fee Management" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Investor Relations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Marketing Strategy" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest1_1 [label="Success Fee Structures" color="#BDBDBD" fillcolor="#F5F5F5" shape=oval style=filled]
+		nest1_2 [label="Financial Projection Analysis" color="#6FE1D5" fillcolor="#C9EFEC" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N2 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [label="develops products" color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N7 [label="markets projects" color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [label="plans promotions" color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S2 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M1 [label="distributes rewards" color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [label="sends emails" color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N11 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_199.txt b/test/graphviz/graph_hard/graphviz_199.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9bff1b817b85f95bb9cd690b71217448565e41af
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_199.txt
@@ -0,0 +1,34 @@
+<Campaign Creation, connectedTo, Social Media Promotion>
+<Community Building, connectedTo, Goal Setting>
+<Community Building, distributes rewards, Securities Regulations Adherence>
+<Donation_Based Crowdfunding, connectedTo, Platform Fee Management>
+<Donation_Based Crowdfunding, partOf, Donation_Based Crowdfunding>
+<Email List Building, connectedTo, Community Building>
+<Financial Projection Analysis, markets projects, Logistics for Rewards>
+<Financial Projection Analysis, partOf, Financial Projection Analysis>
+<Funding Period Management, connectedTo, Logistics for Rewards>
+<Goal Setting, connectedTo, Donation_Based Crowdfunding>
+<Goal Setting, connectedTo, Securities Regulations Adherence>
+<Investor Verification, connectedTo, Campaign Creation>
+<Investor Verification, connectedTo, Securities Regulations Adherence>
+<Legal Compliance, connectedTo, Funding Period Management>
+<Legal Compliance, connectedTo, Press Outreach>
+<Legal Compliance, develops products, Marketing Strategy>
+<Logistics for Rewards, connectedTo, Email List Building>
+<Marketing Strategy, connectedTo, Success Fee Structures>
+<Marketing Strategy, partOf, Marketing Strategy>
+<Platform Fee Management, connectedTo, Campaign Creation>
+<Platform Fee Management, partOf, Platform Fee Management>
+<Press Outreach, connectedTo, Funding Period Management>
+<Social Media Promotion, connectedTo, Email List Building>
+<Social Media Promotion, connectedTo, Funding Period Management>
+<Social Media Promotion, connectedTo, Goal Setting>
+<Social Media Promotion, connectedTo, Legal Compliance>
+<Social Media Promotion, connectedTo, Logistics for Rewards>
+<Social Media Promotion, connectedTo, Securities Regulations Adherence>
+<Social Media Promotion, plans promotions, Securities Regulations Adherence>
+<Success Fee Structures, connectedTo, Financial Projection Analysis>
+<Success Fee Structures, partOf, Success Fee Structures>
+<Tax Implications of Crowdfunding, connectedTo, Funding Period Management>
+<Tax Implications of Crowdfunding, connectedTo, Investor Verification>
+<Tax Implications of Crowdfunding, sends emails, Securities Regulations Adherence>
diff --git a/test/graphviz/graph_hard/graphviz_2.dot b/test/graphviz/graph_hard/graphviz_2.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ea7a50c8375620d351782cdde8e9f4905ca019ba
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_2.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=TD
+	N0 [label=Underwriting color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N1 [label="Compliance Review" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N2 [label="IPO Launch" color="#00BCD4" fillcolor="#E0F7FA" shape=Mdiamond style=filled]
+	N3 [label="AML Screening" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N4 [label="Risk Assessment" color="#FF5722" fillcolor="#FFCCBC" shape=folder style=filled]
+	N5 [label="Treasury Management" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N6 [label="Market Analysis" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+	N7 [label="Dispute Resolution" color="#81C784" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N8 [label="Financial Reporting" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+	N9 [label="Customer Onboarding" color="#00BCD4" fillcolor="#E0F7FA" shape=plaintext style=filled]
+	N10 [label="Collateral Evaluation" color="#FF5722" fillcolor="#FFCCBC" shape=folder style=filled]
+	N11 [label="Cryptocurrency Exchange" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N12 [label="Debt Collection" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	S0 [label="" color="#81C784" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Fund Disbursement" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Loan Processing" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+		nest0_1 [label="Payment Gateway Integration" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+		nest0_2 [label="Investment Planning" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Mortgage Application" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Credit Card Application" color="#00BCD4" fillcolor="#E0F7FA" shape=Mdiamond style=filled]
+		nest1_1 [label="Securities Trading" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+		nest1_2 [label="Income Verification" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=plans color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=disburses color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=budgets color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=underwrites color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N9 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_2.txt b/test/graphviz/graph_hard/graphviz_2.txt
new file mode 100644
index 0000000000000000000000000000000000000000..83886246932b8a1992543a21ae0a5dac9c79d3ae
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_2.txt
@@ -0,0 +1,35 @@
+<AML Screening, connectedTo, Risk Assessment>
+<Collateral Evaluation, connectedTo, Credit Card Application>
+<Collateral Evaluation, connectedTo, Loan Processing>
+<Collateral Evaluation, underwrites, Cryptocurrency Exchange>
+<Compliance Review, connectedTo, IPO Launch>
+<Credit Card Application, connectedTo, Securities Trading>
+<Credit Card Application, partOf, Credit Card Application>
+<Cryptocurrency Exchange, connectedTo, Debt Collection>
+<Customer Onboarding, connectedTo, Collateral Evaluation>
+<Dispute Resolution, budgets, Financial Reporting>
+<Dispute Resolution, connectedTo, Cryptocurrency Exchange>
+<Financial Reporting, connectedTo, Customer Onboarding>
+<IPO Launch, connectedTo, AML Screening>
+<IPO Launch, connectedTo, Collateral Evaluation>
+<IPO Launch, connectedTo, Cryptocurrency Exchange>
+<IPO Launch, connectedTo, Dispute Resolution>
+<IPO Launch, connectedTo, Treasury Management>
+<Income Verification, connectedTo, Treasury Management>
+<Income Verification, partOf, Income Verification>
+<Investment Planning, connectedTo, Customer Onboarding>
+<Investment Planning, partOf, Investment Planning>
+<Loan Processing, connectedTo, Payment Gateway Integration>
+<Loan Processing, partOf, Loan Processing>
+<Market Analysis, connectedTo, Collateral Evaluation>
+<Market Analysis, connectedTo, Cryptocurrency Exchange>
+<Market Analysis, connectedTo, Debt Collection>
+<Market Analysis, disburses, Dispute Resolution>
+<Payment Gateway Integration, connectedTo, Investment Planning>
+<Payment Gateway Integration, partOf, Payment Gateway Integration>
+<Risk Assessment, connectedTo, Cryptocurrency Exchange>
+<Risk Assessment, connectedTo, Treasury Management>
+<Securities Trading, connectedTo, Income Verification>
+<Securities Trading, partOf, Securities Trading>
+<Treasury Management, plans, Market Analysis>
+<Underwriting, connectedTo, Compliance Review>
diff --git a/test/graphviz/graph_hard/graphviz_200.dot b/test/graphviz/graph_hard/graphviz_200.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5950bd922cb956ff7a62d0f7c4ab804a37aeb623
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_200.dot
@@ -0,0 +1,86 @@
+digraph {
+	rankdir=BT
+	N0 [label="Debt Crowdfunding" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N1 [label="Goal Setting" color="#BCB88A" fillcolor="#F5F5DC" shape=oval style=filled]
+	N2 [label="Donation_Based Crowdfunding" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N3 [label="Marketing Strategy" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N4 [label="Logistics for Rewards" color="#BCB88A" fillcolor="#F5F5DC" shape=plaintext style=filled]
+	N5 [label="Payment Processing" color="#BCB88A" fillcolor="#F5F5DC" shape=folder style=filled]
+	N6 [label="Post_Campaign Reporting" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N7 [label="Equity Crowdfunding" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N8 [label="Post_Campaign Updates" color="#795548" fillcolor="#D7CCC8" shape=diamond style=filled]
+	N9 [label="Investor Relations" color="#BCB88A" fillcolor="#F5F5DC" shape=plaintext style=filled]
+	N10 [label="Fulfillment Planning" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N11 [label="Platform Selection" color="#BCB88A" fillcolor="#F5F5DC" shape=folder style=filled]
+	N12 [label="Manufacturing Planning" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N13 [label="Video Production for Campaigns" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N14 [label="Escrow Management" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N15 [label="Real Estate Crowdfunding" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N16 [label="Pitch Deck Preparation" color="#F7BEE0" fillcolor="#FAEBF3" shape=Mdiamond style=filled]
+	N17 [label="Reward_Based Crowdfunding" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+	N18 [label="Reward Tier Design" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N19 [label="Legal Compliance" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N20 [label="Financial Projection Analysis" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Success Fee Structures" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Intellectual Property Protection" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+		nest0_1 [label="International Crowdfunding" color="#BCB88A" fillcolor="#F5F5DC" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Platform Fee Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Project Vetting" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+		nest1_1 [label="Securities Regulations Adherence" color="#795548" fillcolor="#D7CCC8" shape=folder style=filled]
+		nest1_2 [label="Funding Period Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="manages debt" color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [label="manages manufacturing" color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N18 -> N19 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N19 -> N20 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest0_0 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N12 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N20 [label="analyzes data" color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N19 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [label="provides support" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N19 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label="analyzes data" color="#795548" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_201.dot b/test/graphviz/graph_hard/graphviz_201.dot
new file mode 100644
index 0000000000000000000000000000000000000000..43f83e99d5e759bd4b87e4378b0b2ed0920ab3c6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_201.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=LR
+	N0 [label="Video Production for Campaigns" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N1 [label="Customer Support for Backers" color="#FFEB3B" fillcolor="#FFF9C4" shape=octagon style=filled]
+	N2 [label="Campaign Creation" color="#03A9F4" fillcolor="#B3E5FC" shape=folder style=filled]
+	N3 [label="Real Estate Crowdfunding" color="#03A9F4" fillcolor="#B3E5FC" shape=folder style=filled]
+	N4 [label="Financial Projection Analysis" color="#03A9F4" fillcolor="#B3E5FC" shape=plaintext style=filled]
+	N5 [label="Backer Communication" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N6 [label="Due Diligence for Projects" color="#FFEB3B" fillcolor="#FFF9C4" shape=folder style=filled]
+	N7 [label="Donation_Based Crowdfunding" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N8 [label="Post_Campaign Reporting" color="#FFEB3B" fillcolor="#FFF9C4" shape=plaintext style=filled]
+	N9 [label="Platform Fee Management" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N10 [label="Debt Crowdfunding" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N11 [label="International Crowdfunding" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N12 [label="Investor Verification" color="#9575CD" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	N13 [label="Shareholder Management" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	S0 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Funding Period Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Logistics for Rewards" color="#FFEB3B" fillcolor="#FFF9C4" shape=oval style=filled]
+		nest0_1 [label="Fulfillment Planning" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest0_2 [label="Reward Tier Design" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Intellectual Property Protection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Community Building" color="#03A9F4" fillcolor="#B3E5FC" shape=hexagon style=filled]
+		nest1_1 [label="Manufacturing Planning" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+		nest1_2 [label="Payment Processing" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N12 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [label="promotes campaigns" color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [label="vets projects" color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [label="communicates updates" color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_201.txt b/test/graphviz/graph_hard/graphviz_201.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cedb8634cdf0eb00c35aa6c76a619403aa1070c4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_201.txt
@@ -0,0 +1,37 @@
+<Backer Communication, communicates updates, Donation_Based Crowdfunding>
+<Backer Communication, connectedTo, Due Diligence for Projects>
+<Backer Communication, connectedTo, Investor Verification>
+<Backer Communication, connectedTo, Platform Fee Management>
+<Backer Communication, vets projects, Shareholder Management>
+<Campaign Creation, connectedTo, Real Estate Crowdfunding>
+<Community Building, connectedTo, Manufacturing Planning>
+<Community Building, partOf, Community Building>
+<Customer Support for Backers, connectedTo, Backer Communication>
+<Customer Support for Backers, connectedTo, Campaign Creation>
+<Customer Support for Backers, connectedTo, Due Diligence for Projects>
+<Customer Support for Backers, connectedTo, Financial Projection Analysis>
+<Customer Support for Backers, connectedTo, Investor Verification>
+<Customer Support for Backers, promotes campaigns, Post_Campaign Reporting>
+<Debt Crowdfunding, connectedTo, International Crowdfunding>
+<Donation_Based Crowdfunding, connectedTo, Post_Campaign Reporting>
+<Due Diligence for Projects, connectedTo, Donation_Based Crowdfunding>
+<Financial Projection Analysis, connectedTo, Backer Communication>
+<Financial Projection Analysis, connectedTo, Logistics for Rewards>
+<Fulfillment Planning, connectedTo, Reward Tier Design>
+<Fulfillment Planning, partOf, Fulfillment Planning>
+<International Crowdfunding, connectedTo, Investor Verification>
+<Investor Verification, connectedTo, Shareholder Management>
+<Logistics for Rewards, connectedTo, Fulfillment Planning>
+<Logistics for Rewards, partOf, Logistics for Rewards>
+<Manufacturing Planning, connectedTo, Payment Processing>
+<Manufacturing Planning, partOf, Manufacturing Planning>
+<Payment Processing, connectedTo, Investor Verification>
+<Payment Processing, partOf, Payment Processing>
+<Platform Fee Management, connectedTo, Debt Crowdfunding>
+<Post_Campaign Reporting, connectedTo, Platform Fee Management>
+<Real Estate Crowdfunding, connectedTo, Backer Communication>
+<Real Estate Crowdfunding, connectedTo, Community Building>
+<Real Estate Crowdfunding, connectedTo, Financial Projection Analysis>
+<Reward Tier Design, connectedTo, Donation_Based Crowdfunding>
+<Reward Tier Design, partOf, Reward Tier Design>
+<Video Production for Campaigns, connectedTo, Customer Support for Backers>
diff --git a/test/graphviz/graph_hard/graphviz_203.txt b/test/graphviz/graph_hard/graphviz_203.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1c62db6ddcf6dcdc32179e13752745da2fc1035d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_203.txt
@@ -0,0 +1,30 @@
+<API Development for IoT, connectedTo, Device Management>
+<API Development for IoT, connectedTo, Over_the_Air Updates>
+<Agricultural IoT, connectedTo, API Development for IoT>
+<Agricultural IoT, connectedTo, Connectivity Management>
+<Agricultural IoT, connectedTo, Device Prototyping>
+<Blockchain for IoT Security, connectedTo, Data Processing at Edge>
+<Blockchain for IoT Security, partOf, Blockchain for IoT Security>
+<Cloud Platform Integration, connectedTo, Agricultural IoT>
+<Cloud Platform Integration, connectedTo, Device Prototyping>
+<Connectivity Management, partOf, Connectivity Management>
+<Connectivity Management, uses blockchain, IoT Device Certification>
+<Data Privacy in IoT, connectedTo, Device Prototyping>
+<Data Privacy in IoT, connectedTo, Security Implementation>
+<Data Processing at Edge, connectedTo, API Development for IoT>
+<Device Management, connectedTo, Blockchain for IoT Security>
+<Device Management, partOf, Device Management>
+<Device Prototyping, connectedTo, API Development for IoT>
+<Device Prototyping, connectedTo, Data Processing at Edge>
+<Device Prototyping, connectedTo, Gateway Development>
+<Device Prototyping, connectedTo, Over_the_Air Updates>
+<Device Prototyping, connectedTo, Smart City Sensors>
+<Gateway Development, connectedTo, API Development for IoT>
+<Gateway Development, connectedTo, Smart City Sensors>
+<IoT Device Certification, connectedTo, Smart City Sensors>
+<IoT Device Certification, partOf, IoT Device Certification>
+<Security Implementation, connectedTo, Device Prototyping>
+<Security Implementation, ensures privacy, Cloud Platform Integration>
+<Smart City Sensors, connectedTo, API Development for IoT>
+<Smart City Sensors, connectedTo, Data Processing at Edge>
+<Smart City Sensors, connectedTo, Over_the_Air Updates>
diff --git a/test/graphviz/graph_hard/graphviz_204.dot b/test/graphviz/graph_hard/graphviz_204.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1afb26e53ca73c25efa12cd37d1a3ab4807fa142
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_204.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=LR
+	N0 [label="IoT Device Certification" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N1 [label="Smart City Sensors" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N2 [label="Agricultural IoT" color="#FFE69C" fillcolor="#FFF9D4" shape=Mdiamond style=filled]
+	N3 [label="User Interface for IoT Apps" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N4 [label="AI at the Edge" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N5 [label="Cloud Platform Integration" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N6 [label="Device Prototyping" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N7 [label="Asset Tracking" color="#FFE69C" fillcolor="#FFF9D4" shape=Mdiamond style=filled]
+	N8 [label="Connected Vehicles" color="#AED581" fillcolor="#F0F4C3" shape=oval style=filled]
+	N9 [label="Real_time Data Streaming" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N10 [label="Predictive Maintenance" color="#AED581" fillcolor="#F0F4C3" shape=plaintext style=filled]
+	N11 [label="Transportation IoT" color="#FFF8A6" fillcolor="#FFFDE0" shape=diamond style=filled]
+	N12 [label="API Development for IoT" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N13 [label="Blockchain for IoT Security" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N14 [label="Smart Home Devices" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	S0 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Data Privacy in IoT" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Wearable Technology" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+		nest0_1 [label="Gateway Development" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest0_2 [label="Compliance with IoT Regulations" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest0_3 [label="Firmware Updates" color="#AED581" fillcolor="#F0F4C3" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Connectivity Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Interoperability Standards" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest1_1 [label="Industrial IoT" color="#FFF8A6" fillcolor="#FFFDE0" shape=plaintext style=filled]
+		nest1_2 [label="Security Implementation" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label="enables wearables" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [label="collects data" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N2 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [label="optimizes industrial processes" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_205.dot b/test/graphviz/graph_hard/graphviz_205.dot
new file mode 100644
index 0000000000000000000000000000000000000000..585ff1ec45d1f0e8a4378b8a274ab908173a98ad
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_205.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=RL
+	N0 [label="Edge Computing Hardware Selection" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N1 [label="Telecom Edge Computing" color="#94C0C0" fillcolor="#CADEDE" shape=folder style=filled]
+	N2 [label="Connectivity to Cloud" color="#94C0C0" fillcolor="#CADEDE" shape=Mdiamond style=filled]
+	N3 [label="Edge Device Provisioning" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N4 [label="Edge Security Analytics" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N5 [label="Edge AI Model Deployment" color="#FFC085" fillcolor="#FFDAB9" shape=Mdiamond style=filled]
+	N6 [label="Data Synchronization between Edge and Cloud" color="#94C0C0" fillcolor="#CADEDE" shape=folder style=filled]
+	N7 [label="Distributed Data Storage" color="#E57373" fillcolor="#FFEBEE" shape=folder style=filled]
+	N8 [label="Orchestration of Edge Workloads" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N9 [label="Sensor Data Aggregation" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	S0 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Edge API Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Data Filtering at Edge" color="#FFC085" fillcolor="#FFDAB9" shape=oval style=filled]
+		nest0_1 [label="Edge Device Analytics" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+		nest0_2 [label="Healthcare Edge Computing" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+		nest0_3 [label="Edge Gateway Management" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Edge Application Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Edge Network Topology Design" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+		nest1_1 [label="Event_Driven Architectures at Edge" color="#E57373" fillcolor="#FFEBEE" shape=octagon style=filled]
+		nest1_2 [label="Fault Tolerance at Edge" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label="deploys nodes" color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="manages fleet" color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N6 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [label="optimizes resources" color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [label="processes events" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [label="manages power consumption" color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N7 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N9 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_206.dot b/test/graphviz/graph_hard/graphviz_206.dot
new file mode 100644
index 0000000000000000000000000000000000000000..51e792cd9b10805fd3c604139de8dde5e4afe6d9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_206.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=BT
+	N0 [label="Edge Device Provisioning" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N1 [label="Telecom Edge Computing" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N2 [label="Security for Edge Devices" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N3 [label="Remote Device Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=folder style=filled]
+	N4 [label="Edge_to_Cloud Data Transfer Optimization" color="#82DAFF" fillcolor="#C8EDFF" shape=oval style=filled]
+	N5 [label="Fault Tolerance at Edge" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N6 [label="Microservices on Edge Devices" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N7 [label="Retail Edge Computing" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N8 [label="Data Synchronization between Edge and Cloud" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N9 [label="Edge AI Model Deployment" color="#A2D0FF" fillcolor="#E8F0FF" shape=diamond style=filled]
+	N10 [label="Smart City Edge Solutions" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N11 [label="Edge Application Development" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N12 [label="Orchestration of Edge Workloads" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N13 [label="Fleet Management for Edge Devices" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N14 [label="Event_Driven Architectures at Edge" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	S0 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Edge Gateway Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Resource Management at Edge" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+		nest0_1 [label="Edge Network Topology Design" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+		nest0_2 [label="Real_time Analytics at Edge" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+		nest0_3 [label="Edge Security Analytics" color="#A2D0FF" fillcolor="#E8F0FF" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Edge API Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Edge Computing Hardware Selection" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+		nest1_1 [label="Distributed Data Storage" color="#82DAFF" fillcolor="#C8EDFF" shape=octagon style=filled]
+		nest1_2 [label="Containerization at Edge" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+		nest1_3 [label="Bandwidth Optimization" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [label="deploys analytics" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [label="optimizes resources" color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N6 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S0 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [label="provisions resources" color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label="filters data" color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	M0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_208.dot b/test/graphviz/graph_hard/graphviz_208.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5b0fdeffd054758b5f9046803012795d5d46a576
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_208.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=BT
+	N0 [label="Cloud_based VPN Setup" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N1 [label="Cloud FinOps" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+	N2 [label="Private Cloud Management" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N3 [label="Cloud Monitoring and Logging" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N4 [label="Network Configuration in Cloud" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+	N5 [label="Cloud Marketplace Integration" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N6 [label="Resource Tagging for Cost Allocation" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N7 [label="DevOps on Cloud" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Cloud Automation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cloud Vendor Lock_in Mitigation" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest0_1 [label="Infrastructure as a Service" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest0_2 [label="Identity and Access Management" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+		nest0_3 [label="Public Cloud Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Software as a Service" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Multi_Cloud Management" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest1_1 [label="Platform as a Service" color="#8C9EFF" fillcolor="#D3D7EB" shape=plaintext style=filled]
+		nest1_2 [label="Cloud Migration Strategy" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest1_3 [label="Compliance in Cloud" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N3 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_208.txt b/test/graphviz/graph_hard/graphviz_208.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a954d00b320bd8ddf68b0bb6446ea26b23bcda59
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_208.txt
@@ -0,0 +1,35 @@
+<Cloud FinOps, connectedTo, Cloud Monitoring and Logging>
+<Cloud FinOps, connectedTo, Network Configuration in Cloud>
+<Cloud FinOps, connectedTo, Private Cloud Management>
+<Cloud FinOps, connectedTo, Resource Tagging for Cost Allocation>
+<Cloud Marketplace Integration, connectedTo, Resource Tagging for Cost Allocation>
+<Cloud Migration Strategy, connectedTo, Compliance in Cloud>
+<Cloud Migration Strategy, partOf, Cloud Migration Strategy>
+<Cloud Monitoring and Logging, connectedTo, Network Configuration in Cloud>
+<Cloud Vendor Lock_in Mitigation, connectedTo, Infrastructure as a Service>
+<Cloud Vendor Lock_in Mitigation, partOf, Cloud Vendor Lock_in Mitigation>
+<Cloud_based VPN Setup, connectedTo, Cloud FinOps>
+<Cloud_based VPN Setup, connectedTo, Cloud Marketplace Integration>
+<Cloud_based VPN Setup, connectedTo, Cloud Monitoring and Logging>
+<Cloud_based VPN Setup, connectedTo, DevOps on Cloud>
+<Cloud_based VPN Setup, connectedTo, Network Configuration in Cloud>
+<Cloud_based VPN Setup, connectedTo, Private Cloud Management>
+<Cloud_based VPN Setup, connectedTo, Resource Tagging for Cost Allocation>
+<Compliance in Cloud, connectedTo, Cloud Marketplace Integration>
+<Compliance in Cloud, partOf, Compliance in Cloud>
+<Identity and Access Management, connectedTo, Public Cloud Management>
+<Identity and Access Management, partOf, Identity and Access Management>
+<Infrastructure as a Service, connectedTo, Identity and Access Management>
+<Infrastructure as a Service, partOf, Infrastructure as a Service>
+<Multi_Cloud Management, connectedTo, Platform as a Service>
+<Multi_Cloud Management, partOf, Multi_Cloud Management>
+<Network Configuration in Cloud, connectedTo, Cloud Marketplace Integration>
+<Platform as a Service, connectedTo, Cloud Migration Strategy>
+<Platform as a Service, partOf, Platform as a Service>
+<Private Cloud Management, connectedTo, Cloud Monitoring and Logging>
+<Private Cloud Management, connectedTo, Cloud Vendor Lock_in Mitigation>
+<Private Cloud Management, connectedTo, Network Configuration in Cloud>
+<Public Cloud Management, connectedTo, Cloud FinOps>
+<Public Cloud Management, partOf, Public Cloud Management>
+<Resource Tagging for Cost Allocation, connectedTo, DevOps on Cloud>
+<Resource Tagging for Cost Allocation, connectedTo, Multi_Cloud Management>
diff --git a/test/graphviz/graph_hard/graphviz_209.txt b/test/graphviz/graph_hard/graphviz_209.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2d9d9f37a874c59e7e3bed8246e845874e3ca274
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_209.txt
@@ -0,0 +1,46 @@
+<CI or CD Pipelines in Cloud, connectedTo, Cloud Migration Strategy>
+<CI or CD Pipelines in Cloud, partOf, CI or CD Pipelines in Cloud>
+<Cloud Audit Trails, connectedTo, Cloud Monitoring and Logging>
+<Cloud Audit Trails, connectedTo, Multi_Cloud Management>
+<Cloud Automation, connectedTo, Machine Learning as a Service>
+<Cloud FinOps, connectedTo, Cloud Marketplace Integration>
+<Cloud Firewall Configuration, connectedTo, Load Balancing in Cloud>
+<Cloud Marketplace Integration, connectedTo, Infrastructure as a Service>
+<Cloud Migration Strategy, connectedTo, Edge_to_Cloud Integration>
+<Cloud Migration Strategy, partOf, Cloud Migration Strategy>
+<Cloud Monitoring and Logging, connectedTo, Platform as a Service>
+<Cloud Monitoring and Logging, partOf, Cloud Monitoring and Logging>
+<Cloud Native Application Development, connectedTo, Compliance in Cloud>
+<Cloud Security, connectedTo, Cloud FinOps>
+<Cloud Security, connectedTo, Private Cloud Management>
+<Cloud Vendor Lock_in Mitigation, connectedTo, Cloud Audit Trails>
+<Cloud_based VPN Setup, connectedTo, Cloud Automation>
+<Cloud_based VPN Setup, connectedTo, Cloud FinOps>
+<Cloud_based VPN Setup, connectedTo, Cloud Firewall Configuration>
+<Cloud_based VPN Setup, connectedTo, Identity and Access Management>
+<Cloud_based VPN Setup, connectedTo, Load Balancing in Cloud>
+<Cloud_based VPN Setup, connectedTo, Private Cloud Management>
+<Compliance in Cloud, connectedTo, CI or CD Pipelines in Cloud>
+<Compliance in Cloud, connectedTo, Cloud FinOps>
+<DevOps on Cloud, connectedTo, Cloud Automation>
+<Edge_to_Cloud Integration, connectedTo, Cloud FinOps>
+<Edge_to_Cloud Integration, partOf, Edge_to_Cloud Integration>
+<Hybrid Cloud Deployment, connectedTo, Cloud_based VPN Setup>
+<Identity and Access Management, connectedTo, Cloud FinOps>
+<Identity and Access Management, connectedTo, Cloud Security>
+<Infrastructure as a Service, connectedTo, Serverless Computing>
+<Machine Learning as a Service, connectedTo, Cloud Audit Trails>
+<Machine Learning as a Service, connectedTo, Cloud Firewall Configuration>
+<Machine Learning as a Service, connectedTo, Cloud Vendor Lock_in Mitigation>
+<Machine Learning as a Service, connectedTo, Load Balancing in Cloud>
+<Machine Learning as a Service, monitors performance, Multi_Cloud Management>
+<Multi_Cloud Management, integrates edge, Cloud Firewall Configuration>
+<Network Configuration in Cloud, connectedTo, Hybrid Cloud Deployment>
+<Platform as a Service, connectedTo, Cloud Security>
+<Platform as a Service, partOf, Platform as a Service>
+<Private Cloud Management, connectedTo, Cloud Audit Trails>
+<Private Cloud Management, connectedTo, Cloud Native Application Development>
+<Public Cloud Management, connectedTo, Cloud FinOps>
+<Public Cloud Management, connectedTo, Network Configuration in Cloud>
+<Serverless Computing, connectedTo, Cloud Audit Trails>
+<Serverless Computing, connectedTo, DevOps on Cloud>
diff --git a/test/graphviz/graph_hard/graphviz_21.dot b/test/graphviz/graph_hard/graphviz_21.dot
new file mode 100644
index 0000000000000000000000000000000000000000..393084ba32837842080e917b0699b8c617b6095c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_21.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=BT
+	N0 [label="Generator Check" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N1 [label="Grid Balancing" color="#FFC085" fillcolor="#FFDAB9" shape=folder style=filled]
+	N2 [label="Energy Trading" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N3 [label="Energy Storage" color="#FFC085" fillcolor="#FFDAB9" shape=parallelogram style=filled]
+	N4 [label="Power Backup" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N5 [label="Energy Efficiency Audit" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N6 [label="Demand Forecast" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N7 [label="Peak Shaving" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N8 [label="Alert Dispatch" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N9 [label="Nuclear Reactor Control" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	S0 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Solar Panel Installation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Distributed Generation Management" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest0_1 [label="Fuel Delivery" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest0_0 -> nest0_1 [label=stores color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Power Plant" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Consumption Logging" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+		nest1_1 [label="Energy Infrastructure Planning" color="#FFC085" fillcolor="#FFDAB9" shape=folder style=filled]
+		nest1_2 [label="Carbon Capture" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [label=licenses color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [label=plans color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N7 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_210.txt b/test/graphviz/graph_hard/graphviz_210.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e035c370f32361143cf8aa3f462a06dedf1d60ef
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_210.txt
@@ -0,0 +1,37 @@
+<API Management in Cloud, connectedTo, Private Cloud Management>
+<API Management in Cloud, connectedTo, Serverless Computing>
+<Cloud Architecture Design, connectedTo, Cloud Native Application Development>
+<Cloud Architecture Design, partOf, Cloud Architecture Design>
+<Cloud Audit Trails, connectedTo, Virtual Machine Management>
+<Cloud Firewall Configuration, connectedTo, Cloud Governance>
+<Cloud Firewall Configuration, connectedTo, Infrastructure as a Service>
+<Cloud Governance, connectedTo, Cloud Audit Trails>
+<Cloud Migration Strategy, connectedTo, Machine Learning as a Service>
+<Cloud Migration Strategy, partOf, Cloud Migration Strategy>
+<Cloud Monitoring and Logging, connectedTo, Disaster Recovery in Cloud>
+<Cloud Monitoring and Logging, connectedTo, Private Cloud Management>
+<Cloud Native Application Development, connectedTo, Serverless Computing>
+<Cloud Native Application Development, partOf, Cloud Native Application Development>
+<Container Orchestration, connectedTo, Cloud Firewall Configuration>
+<Cost Optimization in Cloud, connectedTo, Cloud Firewall Configuration>
+<Cost Optimization in Cloud, connectedTo, Disaster Recovery in Cloud>
+<Cost Optimization in Cloud, connectedTo, Virtual Machine Management>
+<Cost Optimization in Cloud, manages multi_clouds, Cloud Audit Trails>
+<Disaster Recovery in Cloud, connectedTo, Software as a Service>
+<Edge_to_Cloud Integration, connectedTo, Cloud Architecture Design>
+<Edge_to_Cloud Integration, provides IaaS, Container Orchestration>
+<Hybrid Cloud Deployment, partOf, Hybrid Cloud Deployment>
+<Hybrid Cloud Deployment, tags resources, Cloud Migration Strategy>
+<Infrastructure as a Service, connectedTo, Hybrid Cloud Deployment>
+<Infrastructure as a Service, partOf, Infrastructure as a Service>
+<Machine Learning as a Service, connectedTo, Software as a Service>
+<Machine Learning as a Service, partOf, Machine Learning as a Service>
+<Private Cloud Management, connectedTo, Cost Optimization in Cloud>
+<Private Cloud Management, connectedTo, Edge_to_Cloud Integration>
+<Private Cloud Management, connectedTo, Software as a Service>
+<Private Cloud Management, orchestrates Kubernetes, Disaster Recovery in Cloud>
+<Private Cloud Management, performs backups, Cloud Audit Trails>
+<Serverless Computing, connectedTo, Disaster Recovery in Cloud>
+<Serverless Computing, connectedTo, Private Cloud Management>
+<Serverless Computing, migrates workloads, Cloud Monitoring and Logging>
+<Software as a Service, connectedTo, Edge_to_Cloud Integration>
diff --git a/test/graphviz/graph_hard/graphviz_211.txt b/test/graphviz/graph_hard/graphviz_211.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ba4e7ae12a0316dc27f8e05b0f048571ff1b6e0a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_211.txt
@@ -0,0 +1,39 @@
+<Antivirus and Endpoint Protection, connectedTo, Hardware Maintenance>
+<Antivirus and Endpoint Protection, connectedTo, Proxy Server Configuration>
+<Automation Scripting, connectedTo, Hardware Procurement>
+<Automation Scripting, connectedTo, Load Balancer Setup>
+<Automation Scripting, connectedTo, Network Performance Tuning>
+<Automation Scripting, connectedTo, Power and Cooling Management>
+<Capacity Planning, connectedTo, Database Administration>
+<Capacity Planning, partOf, Capacity Planning>
+<Data Center Management, connectedTo, Capacity Planning>
+<Data Center Management, partOf, Data Center Management>
+<Database Administration, connectedTo, Mail Server Management>
+<Database Administration, partOf, Database Administration>
+<Directory Services, connectedTo, Hardware Maintenance>
+<Firewall Management, connectedTo, Hardware Procurement>
+<Group Policy Management, connectedTo, Network Security>
+<Hardware Maintenance, connectedTo, Automation Scripting>
+<Hardware Maintenance, connectedTo, Power and Cooling Management>
+<Hardware Maintenance, connectedTo, VPN Configuration>
+<Hardware Procurement, connectedTo, Data Center Management>
+<Hardware Procurement, connectedTo, Power and Cooling Management>
+<Load Balancer Setup, connectedTo, Environmental Monitoring>
+<Mail Server Management, connectedTo, Directory Services>
+<Network Design, connectedTo, Server Deployment>
+<Network Design, partOf, Network Design>
+<Network Performance Tuning, connectedTo, Firewall Management>
+<Network Security, connectedTo, Antivirus and Endpoint Protection>
+<Power and Cooling Management, connectedTo, Load Balancer Setup>
+<Power and Cooling Management, connectedTo, User Account Management>
+<Proxy Server Configuration, connectedTo, Hardware Maintenance>
+<Proxy Server Configuration, connectedTo, Mail Server Management>
+<Proxy Server Configuration, connectedTo, Power and Cooling Management>
+<Server Deployment, connectedTo, Network Performance Tuning>
+<Server Deployment, partOf, Server Deployment>
+<User Account Management, connectedTo, Virtual Desktop Infrastructure>
+<User Account Management, partOf, User Account Management>
+<VPN Configuration, connectedTo, Automation Scripting>
+<VPN Configuration, virtualizes resources, Power and Cooling Management>
+<Virtual Desktop Infrastructure, connectedTo, Network Design>
+<Virtual Desktop Infrastructure, partOf, Virtual Desktop Infrastructure>
diff --git a/test/graphviz/graph_hard/graphviz_212.txt b/test/graphviz/graph_hard/graphviz_212.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b0dd0e6b4270936984ea0b4bc2de679800fe7e05
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_212.txt
@@ -0,0 +1,37 @@
+<Access Control Systems, connectedTo, Network Design>
+<Automation Scripting, connectedTo, Cloud Integration with On_premise>
+<Backup and Recovery Systems, connectedTo, Access Control Systems>
+<Capacity Planning, connectedTo, Backup and Recovery Systems>
+<Capacity Planning, connectedTo, Firewall Management>
+<Capacity Planning, connectedTo, Operating System Installation>
+<Cloud Integration with On_premise, connectedTo, Patch Management>
+<Cloud Integration with On_premise, connectedTo, Virtualization>
+<Data Center Management, connectedTo, Automation Scripting>
+<Data Center Management, connectedTo, Virtualization>
+<Database Administration, connectedTo, Storage Solutions>
+<Database Administration, partOf, Database Administration>
+<Firewall Management, connectedTo, Backup and Recovery Systems>
+<Firewall Management, connectedTo, Mail Server Management>
+<Firewall Management, connectedTo, Software Licensing Management>
+<Firewall Management, connectedTo, Storage Solutions>
+<Firewall Management, connectedTo, Virtual Desktop Infrastructure>
+<Mail Server Management, connectedTo, Backup and Recovery Systems>
+<Mail Server Management, connectedTo, Network Design>
+<Mail Server Management, connectedTo, Storage Solutions>
+<Mail Server Management, connectedTo, Troubleshooting and Support>
+<Mail Server Management, connectedTo, Virtual Desktop Infrastructure>
+<Network Design, connectedTo, Storage Solutions>
+<Operating System Installation, connectedTo, Web Server Configuration>
+<Operating System Installation, partOf, Operating System Installation>
+<Patch Management, connectedTo, Backup and Recovery Systems>
+<Patch Management, connectedTo, Virtualization>
+<Software Licensing Management, connectedTo, Virtual Desktop Infrastructure>
+<Storage Solutions, connectedTo, Software Licensing Management>
+<Troubleshooting and Support, connectedTo, User Account Management>
+<Troubleshooting and Support, partOf, Troubleshooting and Support>
+<User Account Management, connectedTo, Mail Server Management>
+<User Account Management, partOf, User Account Management>
+<Virtualization, connectedTo, Backup and Recovery Systems>
+<Virtualization, connectedTo, Capacity Planning>
+<Web Server Configuration, connectedTo, Database Administration>
+<Web Server Configuration, partOf, Web Server Configuration>
diff --git a/test/graphviz/graph_hard/graphviz_213.dot b/test/graphviz/graph_hard/graphviz_213.dot
new file mode 100644
index 0000000000000000000000000000000000000000..213db03b7de1b466994f2d5d3f2ebac89b194f43
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_213.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Hardware Maintenance" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Web Server Configuration" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N2 [label="Disaster Recovery Planning" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N3 [label="Operating System Installation" color="#3F51B5" fillcolor="#C5CAE9" shape=parallelogram style=filled]
+	N4 [label="Automation Scripting" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N5 [label="Access Control Systems" color="#A1887F" fillcolor="#EFEBE9" shape=Mdiamond style=filled]
+	N6 [label="Software Licensing Management" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N7 [label="Network Performance Tuning" color="#7986CB" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N8 [label="Cabling and Wiring" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N9 [label="IT Asset Management" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N10 [label="Proxy Server Configuration" color="#7986CB" fillcolor="#E8EAF6" shape=oval style=filled]
+	N11 [label="Troubleshooting and Support" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+	N12 [label="User Account Management" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N13 [label=Virtualization color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N14 [label="VPN Configuration" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N15 [label="Firewall Management" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N16 [label="Antivirus and Endpoint Protection" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N17 [label="Environmental Monitoring" color="#A1887F" fillcolor="#EFEBE9" shape=octagon style=filled]
+	N18 [label="Group Policy Management" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	S0 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Cloud Integration with On_premise" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Database Administration" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+		nest0_1 [label="Hardware Procurement" color="#3F51B5" fillcolor="#C5CAE9" shape=parallelogram style=filled]
+		nest0_2 [label="Patch Management" color="#3F51B5" fillcolor="#C5CAE9" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Power and Cooling Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Monitoring and Alerting" color="#7986CB" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+		nest1_1 [label="Capacity Planning" color="#A1887F" fillcolor="#EFEBE9" shape=octagon style=filled]
+		nest1_2 [label="Remote Access Solutions" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+		nest1_3 [label="Rack and Cabinet Management" color="#A1887F" fillcolor="#EFEBE9" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [label="implements disaster recovery" color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label="manages power" color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label="manages storage" color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [label="manages access controls" color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N14 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [label="manages proxies" color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [label="configures load balancers" color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [label="installs software" color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_215.dot b/test/graphviz/graph_hard/graphviz_215.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b7e13dd85177de1ac409d24c23311f19b90222e0
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_215.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=BT
+	N0 [label=Containerization color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N1 [label="Serverless Deployment" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N2 [label="Feature Flags" color="#4285F4" fillcolor="#D0E0F8" shape=Mdiamond style=filled]
+	N3 [label="Cost Optimization in Cloud DevOps" color="#4285F4" fillcolor="#D0E0F8" shape=parallelogram style=filled]
+	N4 [label="Environment Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N5 [label="Continuous Integration" color="#F44336" fillcolor="#FFCDD2" shape=parallelogram style=filled]
+	N6 [label="Secrets Management" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N7 [label="Cloud Native Development" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N8 [label="Static Code Analysis" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N9 [label="Cross_Functional Team Collaboration" color="#F44336" fillcolor="#FFCDD2" shape=oval style=filled]
+	N10 [label="Automated Deployment" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N11 [label="Automated Testing" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+	N12 [label="Post_Mortem Analysis" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N13 [label="Rollback Strategies" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+	N14 [label="Chaos Engineering" color="#4285F4" fillcolor="#D0E0F8" shape=Mdiamond style=filled]
+	N15 [label=GitOps color="#FFEB3B" fillcolor="#FFF9C4" shape=parallelogram style=filled]
+	N16 [label="Configuration Management" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	S0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Feedback Loops" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Observability Implementation" color="#FFEB3B" fillcolor="#FFF9C4" shape=octagon style=filled]
+		nest0_1 [label="Site Reliability Engineering Principles" color="#4285F4" fillcolor="#D0E0F8" shape=oval style=filled]
+		nest0_2 [label="Version Control" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+		nest0_3 [label="Continuous Delivery" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Monitoring and Logging" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Container Orchestration" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest1_1 [label="Blue_Green Deployments" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+		nest1_2 [label="Dynamic Application Security Testing" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label="manages environments" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [label="automates pipelines" color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest0_0 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N15 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> S0 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [label="manages microservices" color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_215.txt b/test/graphviz/graph_hard/graphviz_215.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bd3fcaa35a2c04765f80c5e32756328d7d68f322
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_215.txt
@@ -0,0 +1,41 @@
+<Automated Deployment, connectedTo, Automated Testing>
+<Automated Testing, connectedTo, Chaos Engineering>
+<Automated Testing, connectedTo, Container Orchestration>
+<Automated Testing, connectedTo, GitOps>
+<Automated Testing, connectedTo, Post_Mortem Analysis>
+<Blue_Green Deployments, connectedTo, Dynamic Application Security Testing>
+<Blue_Green Deployments, partOf, Blue_Green Deployments>
+<Chaos Engineering, connectedTo, GitOps>
+<Cloud Native Development, connectedTo, Static Code Analysis>
+<Container Orchestration, connectedTo, Blue_Green Deployments>
+<Container Orchestration, partOf, Container Orchestration>
+<Containerization, connectedTo, Serverless Deployment>
+<Continuous Delivery, connectedTo, GitOps>
+<Continuous Delivery, partOf, Continuous Delivery>
+<Continuous Integration, connectedTo, Secrets Management>
+<Cost Optimization in Cloud DevOps, connectedTo, Cloud Native Development>
+<Cost Optimization in Cloud DevOps, connectedTo, Environment Management>
+<Cross_Functional Team Collaboration, manages environments, Automated Deployment>
+<Dynamic Application Security Testing, connectedTo, Automated Deployment>
+<Dynamic Application Security Testing, partOf, Dynamic Application Security Testing>
+<Environment Management, connectedTo, Continuous Integration>
+<Feature Flags, connectedTo, Cloud Native Development>
+<Feature Flags, connectedTo, Continuous Integration>
+<Feature Flags, connectedTo, Cost Optimization in Cloud DevOps>
+<GitOps, connectedTo, Configuration Management>
+<Observability Implementation, connectedTo, Site Reliability Engineering Principles>
+<Observability Implementation, partOf, Observability Implementation>
+<Post_Mortem Analysis, connectedTo, Observability Implementation>
+<Post_Mortem Analysis, connectedTo, Rollback Strategies>
+<Rollback Strategies, automates pipelines, Chaos Engineering>
+<Secrets Management, connectedTo, Automated Deployment>
+<Secrets Management, connectedTo, Cloud Native Development>
+<Secrets Management, connectedTo, Rollback Strategies>
+<Serverless Deployment, connectedTo, Cloud Native Development>
+<Serverless Deployment, connectedTo, Feature Flags>
+<Serverless Deployment, manages microservices, Continuous Integration>
+<Site Reliability Engineering Principles, connectedTo, Version Control>
+<Site Reliability Engineering Principles, partOf, Site Reliability Engineering Principles>
+<Static Code Analysis, connectedTo, Cross_Functional Team Collaboration>
+<Version Control, connectedTo, Continuous Delivery>
+<Version Control, partOf, Version Control>
diff --git a/test/graphviz/graph_hard/graphviz_216.dot b/test/graphviz/graph_hard/graphviz_216.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4c9cb09237e48d0cd39fa6f0fdb8f6d137fa7530
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_216.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=RL
+	N0 [label=Containerization color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N1 [label="Feature Flags" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N2 [label="Security in DevOps" color="#FFF8A6" fillcolor="#FFFDE0" shape=plaintext style=filled]
+	N3 [label="Site Reliability Engineering Principles" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N4 [label="Configuration Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N5 [label="Infrastructure Provisioning" color="#03A9F4" fillcolor="#B3E5FC" shape=folder style=filled]
+	N6 [label="Performance Metrics Analysis" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+	N7 [label="Canary Releases" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N8 [label="Blue_Green Deployments" color="#FFC107" fillcolor="#FFECB3" shape=diamond style=filled]
+	N9 [label="Environment Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Immutable Infrastructure" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Code Quality Checks" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+		nest0_1 [label="Collaboration Tools" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest0_2 [label="Monitoring and Logging" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Automated Rollbacks" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Dynamic Application Security Testing" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest1_1 [label="Version Control" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+		nest1_2 [label=GitOps color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+		nest1_3 [label=ChatOps color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+		nest1_0 -> nest1_1 [label="manages environments" color="#FFC107" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N6 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [label="fosters cross_functional teams" color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_216.txt b/test/graphviz/graph_hard/graphviz_216.txt
new file mode 100644
index 0000000000000000000000000000000000000000..78ddcfb9e8bfbccb8a4731ffdda7f4de96fa91d4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_216.txt
@@ -0,0 +1,31 @@
+<Blue_Green Deployments, connectedTo, Environment Management>
+<Canary Releases, connectedTo, Blue_Green Deployments>
+<Canary Releases, connectedTo, Code Quality Checks>
+<ChatOps, connectedTo, Performance Metrics Analysis>
+<ChatOps, partOf, ChatOps>
+<Code Quality Checks, connectedTo, Collaboration Tools>
+<Code Quality Checks, partOf, Code Quality Checks>
+<Collaboration Tools, connectedTo, Monitoring and Logging>
+<Collaboration Tools, partOf, Collaboration Tools>
+<Configuration Management, connectedTo, Blue_Green Deployments>
+<Configuration Management, connectedTo, Infrastructure Provisioning>
+<Containerization, connectedTo, Feature Flags>
+<Dynamic Application Security Testing, manages environments, Version Control>
+<Dynamic Application Security Testing, partOf, Dynamic Application Security Testing>
+<Feature Flags, connectedTo, Configuration Management>
+<Feature Flags, connectedTo, Environment Management>
+<Feature Flags, connectedTo, Security in DevOps>
+<GitOps, connectedTo, ChatOps>
+<GitOps, partOf, GitOps>
+<Infrastructure Provisioning, connectedTo, Performance Metrics Analysis>
+<Monitoring and Logging, connectedTo, Canary Releases>
+<Monitoring and Logging, partOf, Monitoring and Logging>
+<Performance Metrics Analysis, connectedTo, Canary Releases>
+<Performance Metrics Analysis, connectedTo, Dynamic Application Security Testing>
+<Security in DevOps, connectedTo, Site Reliability Engineering Principles>
+<Site Reliability Engineering Principles, connectedTo, Blue_Green Deployments>
+<Site Reliability Engineering Principles, connectedTo, Configuration Management>
+<Site Reliability Engineering Principles, connectedTo, Environment Management>
+<Site Reliability Engineering Principles, fosters cross_functional teams, Canary Releases>
+<Version Control, connectedTo, GitOps>
+<Version Control, partOf, Version Control>
diff --git a/test/graphviz/graph_hard/graphviz_217.txt b/test/graphviz/graph_hard/graphviz_217.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d9f780c54e85b52f826c4819715eed02743ff2d6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_217.txt
@@ -0,0 +1,33 @@
+<Architecture Planning, connectedTo, Backend Development>
+<Architecture Planning, connectedTo, Continuous Delivery>
+<Architecture Planning, connectedTo, Game Development>
+<Architecture Planning, connectedTo, Requirements Gathering>
+<Architecture Planning, connectedTo, System Design>
+<Backend Development, connectedTo, Continuous Delivery>
+<Backend Development, connectedTo, Performance Optimization>
+<Cloud_Native Development, connectedTo, Continuous Delivery>
+<Coding, connectedTo, Architecture Planning>
+<Coding, connectedTo, Continuous Delivery>
+<Coding, connectedTo, Database Design>
+<Coding, connectedTo, Performance Optimization>
+<Coding, connectedTo, Scalability Design>
+<Continuous Delivery, connectedTo, Database Design>
+<Continuous Delivery, connectedTo, Integration Testing>
+<Continuous Delivery, connectedTo, Scalability Design>
+<Continuous Delivery, uses agile methodologies, Scalability Design>
+<Database Design, connectedTo, Integration Testing>
+<Documentation, connectedTo, Maintenance>
+<Documentation, partOf, Documentation>
+<Game Development, connectedTo, Version Control>
+<Game Development, partOf, Game Development>
+<Integration Testing, connectedTo, System Design>
+<Maintenance, connectedTo, Cloud_Native Development>
+<Maintenance, connectedTo, System Design>
+<Performance Optimization, connectedTo, Maintenance>
+<Refactoring, connectedTo, Performance Optimization>
+<Refactoring, partOf, Refactoring>
+<Requirements Gathering, connectedTo, Refactoring>
+<Requirements Gathering, partOf, Requirements Gathering>
+<System Design, connectedTo, Scalability Design>
+<Version Control, connectedTo, Documentation>
+<Version Control, partOf, Version Control>
diff --git a/test/graphviz/graph_hard/graphviz_218.dot b/test/graphviz/graph_hard/graphviz_218.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e1bf6d9671b21a9a8a3d0f03108328ca76fae712
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_218.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=LR
+	N0 [label="Mobile Application Development" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N1 [label="Operating System Development" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+	N2 [label="Data Structures Implementation" color="#A188D0" fillcolor="#DACBE3" shape=oval style=filled]
+	N3 [label="System Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=plaintext style=filled]
+	N4 [label="Desktop Application Development" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N5 [label="Bug Fixing" color="#CDDC39" fillcolor="#E6EE9C" shape=Mdiamond style=filled]
+	N6 [label="Continuous Delivery" color="#A188D0" fillcolor="#DACBE3" shape=plaintext style=filled]
+	N7 [label="Version Control" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N8 [label=Containerization color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N9 [label="Database Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N10 [label=Refactoring color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	S0 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label=Documentation labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Compiler Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=plaintext style=filled]
+		nest0_1 [label="Testing Frameworks" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest0_2 [label="User Interface Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=folder style=filled]
+		nest0_3 [label="Frontend Development" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Cloud_Native Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Technical Debt Management" color="#A188D0" fillcolor="#DACBE3" shape=octagon style=filled]
+		nest1_1 [label="Unit Testing" color="#CDDC39" fillcolor="#E6EE9C" shape=parallelogram style=filled]
+		nest1_2 [label="System Testing" color="#CDDC39" fillcolor="#E6EE9C" shape=folder style=filled]
+		nest1_3 [label="API Development" color="#CB9BE1" fillcolor="#F2E6F5" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [label="designs APIs" color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N7 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N4 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N0 -> N7 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_219.dot b/test/graphviz/graph_hard/graphviz_219.dot
new file mode 100644
index 0000000000000000000000000000000000000000..30952c8e0d8aea100982e0b10bcdae916e7e37b5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_219.dot
@@ -0,0 +1,56 @@
+digraph {
+	rankdir=LR
+	N0 [label="Data Structures Implementation" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Agile Methodologies" color="#FFA726" fillcolor="#FFF3E0" shape=oval style=filled]
+	N2 [label="Game Development" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N3 [label=Containerization color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N4 [label="Frontend Development" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N5 [label="System Testing" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N6 [label="Microservices Architecture" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N7 [label="Integration Testing" color="#D2D2D2" fillcolor="#F0F0F0" shape=plaintext style=filled]
+	N8 [label="Requirements Gathering" color="#42A5F5" fillcolor="#F1F8FF" shape=plaintext style=filled]
+	N9 [label="Mobile Application Development" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label=Maintenance labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Technical Debt Management" color="#D2D2D2" fillcolor="#F0F0F0" shape=parallelogram style=filled]
+		nest0_1 [label="Architecture Planning" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+		nest0_2 [label="Performance Optimization" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Continuous Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Web Application Development" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+		nest1_1 [label="User Experience Design" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N5 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N7 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [label="manages data structures" color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [label="ensures scalability" color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [label="compiles code" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_22.dot b/test/graphviz/graph_hard/graphviz_22.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f3aaa1bd22d007b8ce521745cf8d2345ef35f224
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_22.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=LR
+	N0 [label="Client Interview" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N1 [label="Corporate Formation" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N2 [label="Child Custody" color="#BDAFA8" fillcolor="#E4E0DF" shape=oval style=filled]
+	N3 [label="Case Filing" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N4 [label="Trial Session" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N5 [label="Patent Application" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N6 [label=Enforcement color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N7 [label=Sentencing color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N8 [label="Closing Argument" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N9 [label="Judgment Writing" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N10 [label="Legal Consultation" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N11 [label="Copyright Infringement" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N12 [label="Estate Planning" color="#BDAFA8" fillcolor="#E4E0DF" shape=oval style=filled]
+	N13 [label="Arbitration Session" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N14 [label="Intel Property Licensing" color="#F44336" fillcolor="#FFCDD2" shape=oval style=filled]
+	N15 [label="Due Diligence" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	S0 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Court Order Execution" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Cross_Examination color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+		nest0_1 [label="Bail Hearing" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+		nest0_2 [label="Trademark Registration" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Pro Bono Work" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Immigration Petition" color="#BDAFA8" fillcolor="#E4E0DF" shape=Mdiamond style=filled]
+		nest1_1 [label="Divorce Proceedings" color="#BDAFA8" fillcolor="#E4E0DF" shape=folder style=filled]
+		nest1_2 [label="Legal Research" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=certifies color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N14 -> nest0_0 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N10 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [label=educates color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N15 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_220.dot b/test/graphviz/graph_hard/graphviz_220.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7fdccece9b1a0325fc3e75e1fb323910ac1dd0b9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_220.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=TD
+	N0 [label="Electromagnetic Compatibility Testing" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Component Selection" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N2 [label=Prototyping color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N3 [label="Sensor Integration" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N4 [label="Troubleshooting and Debugging" color="#A1887F" fillcolor="#EFEBE9" shape=plaintext style=filled]
+	N5 [label="ASIC Design" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N6 [label="Intellectual Property Protection" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N7 [label="Mixed_Signal Design" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N8 [label="RF Circuit Design" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N9 [label="High_Speed Digital Design" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N10 [label="Optical Module Design" color="#A1887F" fillcolor="#EFEBE9" shape=plaintext style=filled]
+	N11 [label="Enclosure Design" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N12 [label="Quality Control" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N13 [label="Manufacturing Process Planning" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N14 [label=Documentation color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	S1 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Microcontroller Programming" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Thermal Management" color="#FFE69C" fillcolor="#FFF9D4" shape=diamond style=filled]
+		nest0_1 [label="Firmware Development" color="#A1887F" fillcolor="#EFEBE9" shape=parallelogram style=filled]
+		nest0_2 [label="Assembly Line Optimization" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+		nest0_3 [label="Supply Chain Management for Components" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Power Integrity Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Testing and Validation" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+		nest1_1 [label="Regulatory Compliance" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+		nest1_2 [label="Schematic Capture" color="#FFE69C" fillcolor="#FFF9D4" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="lays out PCBs" color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="designs mixed_signal" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label="designs mechanicals" color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N9 [label="selects components" color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S1 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [label="manages EMC" color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [label="creates schematics" color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N9 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_221.txt b/test/graphviz/graph_hard/graphviz_221.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a1c8eefd282630a259074020763129c8e046be92
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_221.txt
@@ -0,0 +1,36 @@
+<ASIC Design, connectedTo, Signal Integrity Analysis>
+<ASIC Design, partOf, ASIC Design>
+<Actuator Control, connectedTo, Prototyping>
+<Actuator Control, partOf, Actuator Control>
+<Circuit Design, connectedTo, Regulatory Compliance>
+<Circuit Design, connectedTo, Testing and Validation>
+<Documentation, connectedTo, Circuit Design>
+<Documentation, connectedTo, Regulatory Compliance>
+<Enclosure Design, connectedTo, Thermal Management>
+<High_Speed Digital Design, connectedTo, Thermal Management>
+<High_Speed Digital Design, partOf, High_Speed Digital Design>
+<Low_Power Design, connectedTo, Power Management Design>
+<Low_Power Design, partOf, Low_Power Design>
+<Manufacturing Process Planning, connectedTo, Material Selection>
+<Material Selection, connectedTo, Electromagnetic Compatibility Testing>
+<Material Selection, connectedTo, Mechanical Design Integration>
+<Mechanical Design Integration, connectedTo, ASIC Design>
+<Mechanical Design Integration, partOf, Mechanical Design Integration>
+<Optical Module Design, connectedTo, Prototyping>
+<Power Management Design, connectedTo, Actuator Control>
+<Power Management Design, partOf, Power Management Design>
+<Prototyping, connectedTo, Enclosure Design>
+<Prototyping, connectedTo, Quality Control>
+<Prototyping, connectedTo, Regulatory Compliance>
+<Prototyping, connectedTo, Troubleshooting and Debugging>
+<Quality Control, analyzes signals, Documentation>
+<Quality Control, connectedTo, Testing and Validation>
+<Regulatory Compliance, connectedTo, Troubleshooting and Debugging>
+<Signal Integrity Analysis, connectedTo, High_Speed Digital Design>
+<Signal Integrity Analysis, partOf, Signal Integrity Analysis>
+<Testing and Validation, connectedTo, Enclosure Design>
+<Thermal Management, connectedTo, Manufacturing Process Planning>
+<Troubleshooting and Debugging, connectedTo, Low_Power Design>
+<Troubleshooting and Debugging, connectedTo, Manufacturing Process Planning>
+<Troubleshooting and Debugging, connectedTo, Testing and Validation>
+<Troubleshooting and Debugging, designs mixed_signal, Electromagnetic Compatibility Testing>
diff --git a/test/graphviz/graph_hard/graphviz_222.dot b/test/graphviz/graph_hard/graphviz_222.dot
new file mode 100644
index 0000000000000000000000000000000000000000..05ecfaffccca51cd105b5932a823ec2564b0118f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_222.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=LR
+	N0 [label="Optical Module Design" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N1 [label="Environmental Testing" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N2 [label="Cost Optimization" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N3 [label="Test Fixture Design" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N4 [label="Troubleshooting and Debugging" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N5 [label="Power Management Design" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N6 [label="Testing and Validation" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N7 [label="Power Integrity Analysis" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N8 [label="PCB Layout" color="#FFE69C" fillcolor="#FFF9D4" shape=Mdiamond style=filled]
+	N9 [label="High_Speed Digital Design" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N10 [label="Mixed_Signal Design" color="#80DDEA" fillcolor="#D3F7F9" shape=parallelogram style=filled]
+	N11 [label="Mechanical Design Integration" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	S0 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Electromagnetic Compatibility Testing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Component Selection" color="#5C6BC0" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+		nest0_1 [label="Supply Chain Management for Components" color="#FFE69C" fillcolor="#FFF9D4" shape=diamond style=filled]
+		nest0_2 [label="RF Circuit Design" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Regulatory Compliance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Low_Power Design" color="#FFE69C" fillcolor="#FFF9D4" shape=folder style=filled]
+		nest1_1 [label=Prototyping color="#FFE69C" fillcolor="#FFF9D4" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="manages power" color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [label="designs FPGAs" color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N6 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [label="controls actuators" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N3 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> S2 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N5 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [label="ensures quality" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [label="analyzes signals" color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_222.txt b/test/graphviz/graph_hard/graphviz_222.txt
new file mode 100644
index 0000000000000000000000000000000000000000..83730d0065b6c8ef423e72e868d57bdba52efaee
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_222.txt
@@ -0,0 +1,35 @@
+<Component Selection, connectedTo, Supply Chain Management for Components>
+<Component Selection, partOf, Component Selection>
+<Cost Optimization, connectedTo, Test Fixture Design>
+<Environmental Testing, connectedTo, Cost Optimization>
+<Environmental Testing, connectedTo, High_Speed Digital Design>
+<Environmental Testing, connectedTo, Mixed_Signal Design>
+<Environmental Testing, connectedTo, Power Management Design>
+<Environmental Testing, connectedTo, Test Fixture Design>
+<High_Speed Digital Design, connectedTo, Mixed_Signal Design>
+<Low_Power Design, connectedTo, Prototyping>
+<Low_Power Design, partOf, Low_Power Design>
+<Mixed_Signal Design, connectedTo, Mechanical Design Integration>
+<Optical Module Design, connectedTo, Environmental Testing>
+<PCB Layout, connectedTo, High_Speed Digital Design>
+<Power Integrity Analysis, analyzes signals, Mechanical Design Integration>
+<Power Integrity Analysis, connectedTo, PCB Layout>
+<Power Management Design, connectedTo, Component Selection>
+<Power Management Design, connectedTo, Testing and Validation>
+<Prototyping, connectedTo, Testing and Validation>
+<Prototyping, partOf, Prototyping>
+<RF Circuit Design, connectedTo, Troubleshooting and Debugging>
+<RF Circuit Design, partOf, RF Circuit Design>
+<Supply Chain Management for Components, connectedTo, RF Circuit Design>
+<Supply Chain Management for Components, partOf, Supply Chain Management for Components>
+<Test Fixture Design, connectedTo, High_Speed Digital Design>
+<Test Fixture Design, connectedTo, Mechanical Design Integration>
+<Test Fixture Design, connectedTo, Power Management Design>
+<Test Fixture Design, connectedTo, Troubleshooting and Debugging>
+<Test Fixture Design, ensures quality, Testing and Validation>
+<Testing and Validation, connectedTo, High_Speed Digital Design>
+<Testing and Validation, connectedTo, Mechanical Design Integration>
+<Testing and Validation, controls actuators, PCB Layout>
+<Testing and Validation, designs FPGAs, Low_Power Design>
+<Testing and Validation, manages power, Power Integrity Analysis>
+<Troubleshooting and Debugging, connectedTo, Power Management Design>
diff --git a/test/graphviz/graph_hard/graphviz_223.txt b/test/graphviz/graph_hard/graphviz_223.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8f834553fbcdf008be6d5cec26afce89d1f73e0b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_223.txt
@@ -0,0 +1,36 @@
+<App Store Optimization, connectedTo, Biometric Authentication>
+<App Store Optimization, connectedTo, Native App Development>
+<App Store Optimization, connectedTo, Real_time Communication Features>
+<App Store Optimization, optimizes performance, Database Design for Mobile>
+<Biometric Authentication, connectedTo, Backend Integration>
+<Camera Integration, connectedTo, Backend Integration>
+<Camera Integration, connectedTo, Database Design for Mobile>
+<Camera Integration, connectedTo, Performance Optimization>
+<Camera Integration, connectedTo, Real_time Communication Features>
+<Camera Integration, connectedTo, Wearable Device Integration>
+<Database Design for Mobile, optimizes ASO, Real_time Communication Features>
+<Deployment to App Stores, connectedTo, Security Implementation>
+<Deployment to App Stores, partOf, Deployment to App Stores>
+<Gamification Elements, connectedTo, User Onboarding Flows>
+<Gamification Elements, partOf, Gamification Elements>
+<Geolocation Services, connectedTo, Gamification Elements>
+<Geolocation Services, partOf, Geolocation Services>
+<Native App Development, connectedTo, Database Design for Mobile>
+<Performance Optimization, connectedTo, App Store Optimization>
+<Performance Optimization, connectedTo, Deployment to App Stores>
+<Real_time Communication Features, connectedTo, Geolocation Services>
+<Real_time Communication Features, manages permissions, Biometric Authentication>
+<Security Implementation, connectedTo, Testing and Debugging>
+<Security Implementation, partOf, Security Implementation>
+<Testing and Debugging, connectedTo, User Feedback Collection>
+<Testing and Debugging, partOf, Testing and Debugging>
+<User Feedback Collection, connectedTo, Performance Optimization>
+<User Feedback Collection, partOf, User Feedback Collection>
+<User Onboarding Flows, connectedTo, App Store Optimization>
+<User Onboarding Flows, partOf, User Onboarding Flows>
+<Wearable Device Integration, connectedTo, App Store Optimization>
+<Wearable Device Integration, connectedTo, Database Design for Mobile>
+<Wearable Device Integration, connectedTo, Performance Optimization>
+<Wearable Device Integration, connectedTo, Real_time Communication Features>
+<Wearable Device Integration, connectedTo, Wireframing>
+<Wireframing, connectedTo, Performance Optimization>
diff --git a/test/graphviz/graph_hard/graphviz_224.dot b/test/graphviz/graph_hard/graphviz_224.dot
new file mode 100644
index 0000000000000000000000000000000000000000..21508466aa0cdb3b916242b361dbde6fc69f141d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_224.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=LR
+	N0 [label="IoT Device Control via App" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N1 [label="Analytics Tracking" color="#A2D0FF" fillcolor="#E8F0FF" shape=folder style=filled]
+	N2 [label="Performance Optimization" color="#FFF176" fillcolor="#FFFDE7" shape=octagon style=filled]
+	N3 [label="Concept Development" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N4 [label="API Development" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N5 [label="Accessibility Features" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N6 [label="Cloud Backend for Mobile" color="#A2D0FF" fillcolor="#E8F0FF" shape=oval style=filled]
+	N7 [label="User Feedback Collection" color="#A2D0FF" fillcolor="#E8F0FF" shape=diamond style=filled]
+	N8 [label="Native App Development" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N9 [label="Backend Integration" color="#A2D0FF" fillcolor="#E8F0FF" shape=octagon style=filled]
+	N10 [label="User Onboarding Flows" color="#A2D0FF" fillcolor="#E8F0FF" shape=parallelogram style=filled]
+	N11 [label="AR or VR Features in Mobile" color="#FFF176" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N12 [label="Push Notification Implementation" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N13 [label=Prototyping color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N14 [label="Microphone Integration" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N15 [label="User Experience Design" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N16 [label="Cross_Platform Development" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	S0 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label=Wireframing labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Offline Mode Development" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+		nest0_1 [label="Real_time Communication Features" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Camera Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Updates and Maintenance" color="#FFC2C2" fillcolor="#FFEBEB" shape=oval style=filled]
+		nest1_1 [label="Subscription Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label="uses geolocation" color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N16 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [label="designs APIs" color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N16 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_224.txt b/test/graphviz/graph_hard/graphviz_224.txt
new file mode 100644
index 0000000000000000000000000000000000000000..db6ca598164102de6ba7c55e3c81a17d0485b90e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_224.txt
@@ -0,0 +1,37 @@
+<API Development, connectedTo, Accessibility Features>
+<API Development, connectedTo, Offline Mode Development>
+<AR or VR Features in Mobile, connectedTo, Push Notification Implementation>
+<Accessibility Features, connectedTo, Cloud Backend for Mobile>
+<Analytics Tracking, connectedTo, Cross_Platform Development>
+<Analytics Tracking, connectedTo, Performance Optimization>
+<Analytics Tracking, connectedTo, Push Notification Implementation>
+<Backend Integration, connectedTo, User Onboarding Flows>
+<Cloud Backend for Mobile, connectedTo, Updates and Maintenance>
+<Cloud Backend for Mobile, connectedTo, User Feedback Collection>
+<Concept Development, connectedTo, Push Notification Implementation>
+<Concept Development, uses geolocation, API Development>
+<IoT Device Control via App, connectedTo, Analytics Tracking>
+<IoT Device Control via App, connectedTo, Cross_Platform Development>
+<Microphone Integration, connectedTo, User Experience Design>
+<Native App Development, connectedTo, AR or VR Features in Mobile>
+<Native App Development, connectedTo, Backend Integration>
+<Native App Development, connectedTo, Microphone Integration>
+<Native App Development, connectedTo, Prototyping>
+<Native App Development, connectedTo, User Experience Design>
+<Offline Mode Development, connectedTo, Real_time Communication Features>
+<Offline Mode Development, partOf, Offline Mode Development>
+<Performance Optimization, connectedTo, Concept Development>
+<Prototyping, connectedTo, Microphone Integration>
+<Push Notification Implementation, connectedTo, Prototyping>
+<Real_time Communication Features, connectedTo, User Onboarding Flows>
+<Real_time Communication Features, partOf, Real_time Communication Features>
+<Subscription Management, connectedTo, Cross_Platform Development>
+<Subscription Management, partOf, Subscription Management>
+<Updates and Maintenance, connectedTo, Subscription Management>
+<Updates and Maintenance, partOf, Updates and Maintenance>
+<User Experience Design, connectedTo, Cross_Platform Development>
+<User Feedback Collection, connectedTo, Cross_Platform Development>
+<User Feedback Collection, connectedTo, Microphone Integration>
+<User Feedback Collection, connectedTo, Native App Development>
+<User Feedback Collection, designs APIs, Prototyping>
+<User Onboarding Flows, connectedTo, AR or VR Features in Mobile>
diff --git a/test/graphviz/graph_hard/graphviz_225.dot b/test/graphviz/graph_hard/graphviz_225.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7c3ed9d4ffe0858d8b306797ee08fc85580ed424
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_225.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=TD
+	N0 [label="Updates and Maintenance" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N1 [label="Native App Development" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N2 [label="Camera Integration" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N3 [label=Wireframing color="#7E57C2" fillcolor="#D1C4E9" shape=oval style=filled]
+	N4 [label="Crash Reporting" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N5 [label="User Experience Design" color="#BDAFA8" fillcolor="#E4E0DF" shape=oval style=filled]
+	N6 [label="Database Design for Mobile" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N7 [label="Concept Development" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N8 [label="AR or VR Features in Mobile" color="#BDAFA8" fillcolor="#E4E0DF" shape=parallelogram style=filled]
+	N9 [label="App Store Optimization" color="#BDAFA8" fillcolor="#E4E0DF" shape=parallelogram style=filled]
+	N10 [label="Geolocation Services" color="#80DDEA" fillcolor="#D3F7F9" shape=diamond style=filled]
+	N11 [label="Performance Optimization" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N12 [label="IoT Device Control via App" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	S0 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Deep Linking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cloud Backend for Mobile" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+		nest0_1 [label="Analytics Tracking" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+		nest0_2 [label="User Feedback Collection" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+		nest0_3 [label="Push Notification Implementation" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Biometric Authentication" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Wearable Device Integration" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+		nest1_1 [label="Payment Gateway Integration" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+		nest1_2 [label="Ad Monetization" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+		nest1_3 [label="Accessibility Features" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N2 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> S0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N3 -> S2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [label="develops native apps" color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N12 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_226.txt b/test/graphviz/graph_hard/graphviz_226.txt
new file mode 100644
index 0000000000000000000000000000000000000000..36c1fe4989e69e6ac7a65916a2229fef0d5665f5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_226.txt
@@ -0,0 +1,37 @@
+<Audience Engagement, connectedTo, Competitor Analysis>
+<Campaign Management, connectedTo, Content Moderation>
+<Campaign Management, connectedTo, Influencer Collaboration>
+<Campaign Management, connectedTo, Personal Branding on Social Media>
+<Competitor Analysis, connectedTo, Content Moderation>
+<Competitor Analysis, connectedTo, Engagement Rate Calculation>
+<Content Moderation, connectedTo, Content Strategy>
+<Content Moderation, connectedTo, Follower Growth Monitoring>
+<Content Strategy, connectedTo, Customer Service on Social Media>
+<Content Strategy, partOf, Content Strategy>
+<Crisis Communication Plan, connectedTo, Link_in_Bio Optimization>
+<Customer Service on Social Media, considers ethics, User_Generated Content Curation>
+<Customer Service on Social Media, partOf, Customer Service on Social Media>
+<Direct Messaging Strategy, connectedTo, Hashtag Research>
+<Emerging Platform Exploration, connectedTo, Direct Messaging Strategy>
+<Emerging Platform Exploration, connectedTo, Trend Monitoring>
+<Emerging Platform Exploration, runs polls, Personal Branding on Social Media>
+<Engagement Rate Calculation, connectedTo, Crisis Communication Plan>
+<Follower Growth Monitoring, connectedTo, Trend Monitoring>
+<Hashtag Research, connectedTo, Competitor Analysis>
+<Hashtag Research, connectedTo, Story Format Content Creation>
+<Hashtag Research, connectedTo, User_Generated Content Curation>
+<Influencer Collaboration, connectedTo, Personal Branding on Social Media>
+<Influencer Collaboration, connectedTo, Platform Algorithm Understanding>
+<Link_in_Bio Optimization, connectedTo, User_Generated Content Curation>
+<Live Streaming on Social Media, connectedTo, Audience Engagement>
+<Personal Branding on Social Media, connectedTo, Direct Messaging Strategy>
+<Platform Algorithm Understanding, connectedTo, Content Moderation>
+<Platform Algorithm Understanding, connectedTo, Emerging Platform Exploration>
+<Platform Algorithm Understanding, connectedTo, Personal Branding on Social Media>
+<Platform Algorithm Understanding, connectedTo, Reach and Impressions Tracking>
+<Platform Selection, connectedTo, Personal Branding on Social Media>
+<Platform Selection, partOf, Platform Selection>
+<Reach and Impressions Tracking, connectedTo, Platform Selection>
+<Reach and Impressions Tracking, partOf, Reach and Impressions Tracking>
+<Story Format Content Creation, connectedTo, Live Streaming on Social Media>
+<User_Generated Content Curation, connectedTo, Content Moderation>
diff --git a/test/graphviz/graph_hard/graphviz_227.dot b/test/graphviz/graph_hard/graphviz_227.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0354bf8da24f62b783bf5923e97966a9ac853657
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_227.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=BT
+	N0 [label="Platform Selection" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Social Selling" color="#9575CD" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N2 [label="Crisis Management" color="#80DDEA" fillcolor="#D3F7F9" shape=diamond style=filled]
+	N3 [label="Personal Branding on Social Media" color="#80DDEA" fillcolor="#D3F7F9" shape=oval style=filled]
+	N4 [label="Audience Engagement" color="#80DDEA" fillcolor="#D3F7F9" shape=Mdiamond style=filled]
+	N5 [label="Partnership Management on Social" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N6 [label="Competitor Analysis" color="#9575CD" fillcolor="#EDE7F6" shape=octagon style=filled]
+	N7 [label="Paid Social Media Advertising" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N8 [label="Trend Monitoring" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N9 [label="Emerging Platform Exploration" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N10 [label="Reporting and Optimization" color="#9575CD" fillcolor="#EDE7F6" shape=oval style=filled]
+	N11 [label="Reels or Short Video Production" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N12 [label="Social Listening" color="#80DDEA" fillcolor="#D3F7F9" shape=Mdiamond style=filled]
+	N13 [label="Link_in_Bio Optimization" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	S0 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Direct Messaging Strategy" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Polls and Quizzes Creation" color="#80DDEA" fillcolor="#D3F7F9" shape=folder style=filled]
+		nest0_1 [label="Brand Voice Development" color="#80DDEA" fillcolor="#D3F7F9" shape=diamond style=filled]
+		nest0_2 [label=Cross_Promotion color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+		nest0_3 [label="Social Media Audits" color="#4CAF50" fillcolor="#C8E6C9" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Crisis Communication Plan" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Performance Analytics" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+		nest1_1 [label="Story Format Content Creation" color="#9575CD" fillcolor="#EDE7F6" shape=hexagon style=filled]
+		nest1_2 [label="Engagement Rate Calculation" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+		nest1_3 [label="Follower Growth Monitoring" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="hosts live streams" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label="supports customers" color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label="develops brand voice" color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N7 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N7 [label="manages campaigns" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_227.txt b/test/graphviz/graph_hard/graphviz_227.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1ef0d5471e9065531704577b02bbf9c366ed29fc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_227.txt
@@ -0,0 +1,37 @@
+<Audience Engagement, connectedTo, Partnership Management on Social>
+<Audience Engagement, connectedTo, Performance Analytics>
+<Audience Engagement, connectedTo, Polls and Quizzes Creation>
+<Brand Voice Development, connectedTo, Cross_Promotion>
+<Brand Voice Development, partOf, Brand Voice Development>
+<Competitor Analysis, hosts live streams, Paid Social Media Advertising>
+<Crisis Management, connectedTo, Emerging Platform Exploration>
+<Crisis Management, connectedTo, Personal Branding on Social Media>
+<Cross_Promotion, connectedTo, Social Media Audits>
+<Cross_Promotion, partOf, Cross_Promotion>
+<Emerging Platform Exploration, connectedTo, Reporting and Optimization>
+<Engagement Rate Calculation, connectedTo, Follower Growth Monitoring>
+<Engagement Rate Calculation, partOf, Engagement Rate Calculation>
+<Follower Growth Monitoring, manages campaigns, Paid Social Media Advertising>
+<Follower Growth Monitoring, partOf, Follower Growth Monitoring>
+<Paid Social Media Advertising, connectedTo, Trend Monitoring>
+<Partnership Management on Social, connectedTo, Competitor Analysis>
+<Performance Analytics, connectedTo, Story Format Content Creation>
+<Performance Analytics, partOf, Performance Analytics>
+<Personal Branding on Social Media, connectedTo, Audience Engagement>
+<Personal Branding on Social Media, connectedTo, Social Listening>
+<Personal Branding on Social Media, connectedTo, Trend Monitoring>
+<Platform Selection, connectedTo, Paid Social Media Advertising>
+<Platform Selection, connectedTo, Social Selling>
+<Polls and Quizzes Creation, connectedTo, Brand Voice Development>
+<Polls and Quizzes Creation, partOf, Polls and Quizzes Creation>
+<Reels or Short Video Production, develops brand voice, Social Listening>
+<Reporting and Optimization, connectedTo, Reels or Short Video Production>
+<Social Listening, connectedTo, Link_in_Bio Optimization>
+<Social Media Audits, connectedTo, Paid Social Media Advertising>
+<Social Media Audits, partOf, Social Media Audits>
+<Social Selling, connectedTo, Crisis Management>
+<Social Selling, connectedTo, Emerging Platform Exploration>
+<Social Selling, connectedTo, Paid Social Media Advertising>
+<Story Format Content Creation, connectedTo, Engagement Rate Calculation>
+<Story Format Content Creation, partOf, Story Format Content Creation>
+<Trend Monitoring, supports customers, Emerging Platform Exploration>
diff --git a/test/graphviz/graph_hard/graphviz_229.dot b/test/graphviz/graph_hard/graphviz_229.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c4e6967805a2fefded00d37bb9163e65023d72b2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_229.dot
@@ -0,0 +1,83 @@
+digraph {
+	rankdir=BT
+	N0 [label="Video Search" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N1 [label="Featured Snippets Optimization" color="#A188D0" fillcolor="#DACBE3" shape=plaintext style=filled]
+	N2 [label="User Experience for Search" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N3 [label="Click_Through Rate Optimization" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N4 [label="Search Engine Optimization" color="#607D8B" fillcolor="#CFD8DC" shape=Mdiamond style=filled]
+	N5 [label="International SEO" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+	N6 [label="Semantic Search" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N7 [label="Rank Tracking" color="#A188D0" fillcolor="#DACBE3" shape=plaintext style=filled]
+	N8 [label="Core Web Vitals Optimization" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N9 [label="Algorithm Updates Monitoring" color="#4DB6AC" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N10 [label="Ranking Algorithms" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N11 [label="Keyword Research" color="#A188D0" fillcolor="#DACBE3" shape=plaintext style=filled]
+	N12 [label="Paid Search Advertising" color="#4DB6AC" fillcolor="#E0F2F1" shape=plaintext style=filled]
+	N13 [label="Search Result Display" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N14 [label="Local SEO" color="#4DB6AC" fillcolor="#E0F2F1" shape=octagon style=filled]
+	N15 [label="Google My Business Management" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N16 [label="Site Architecture Optimization" color="#607D8B" fillcolor="#CFD8DC" shape=folder style=filled]
+	N17 [label="User Intent Understanding" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	S0 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Off_Page SEO" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Personalized Search Results" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+		nest0_1 [label="Shopping Search" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest0_2 [label="Indexing Content" color="#607D8B" fillcolor="#CFD8DC" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Query Processing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="News Search" color="#A188D0" fillcolor="#DACBE3" shape=Mdiamond style=filled]
+		nest1_1 [label="Schema Markup Implementation" color="#607D8B" fillcolor="#CFD8DC" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label="optimizes off_page" color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest0_0 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N6 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [label="detects spam" color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N3 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N9 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N16 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_229.txt b/test/graphviz/graph_hard/graphviz_229.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7e2e4373e21de6fbfc4a198819fba0678e7df7cf
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_229.txt
@@ -0,0 +1,44 @@
+<Algorithm Updates Monitoring, connectedTo, Local SEO>
+<Algorithm Updates Monitoring, connectedTo, Paid Search Advertising>
+<Algorithm Updates Monitoring, connectedTo, Ranking Algorithms>
+<Algorithm Updates Monitoring, connectedTo, Site Architecture Optimization>
+<Click_Through Rate Optimization, connectedTo, Keyword Research>
+<Click_Through Rate Optimization, connectedTo, Search Engine Optimization>
+<Core Web Vitals Optimization, connectedTo, Algorithm Updates Monitoring>
+<Featured Snippets Optimization, connectedTo, Search Engine Optimization>
+<Featured Snippets Optimization, connectedTo, User Experience for Search>
+<Google My Business Management, connectedTo, Site Architecture Optimization>
+<Indexing Content, connectedTo, Semantic Search>
+<Indexing Content, partOf, Indexing Content>
+<International SEO, connectedTo, Semantic Search>
+<Keyword Research, optimizes off_page, Paid Search Advertising>
+<Local SEO, connectedTo, Google My Business Management>
+<News Search, connectedTo, Schema Markup Implementation>
+<News Search, partOf, News Search>
+<Paid Search Advertising, connectedTo, Personalized Search Results>
+<Paid Search Advertising, connectedTo, Search Result Display>
+<Personalized Search Results, connectedTo, Shopping Search>
+<Personalized Search Results, partOf, Personalized Search Results>
+<Rank Tracking, connectedTo, Algorithm Updates Monitoring>
+<Rank Tracking, connectedTo, Core Web Vitals Optimization>
+<Rank Tracking, connectedTo, Google My Business Management>
+<Rank Tracking, connectedTo, Keyword Research>
+<Rank Tracking, connectedTo, Ranking Algorithms>
+<Rank Tracking, connectedTo, Search Result Display>
+<Ranking Algorithms, connectedTo, Keyword Research>
+<Schema Markup Implementation, connectedTo, Click_Through Rate Optimization>
+<Schema Markup Implementation, partOf, Schema Markup Implementation>
+<Search Engine Optimization, connectedTo, International SEO>
+<Search Engine Optimization, connectedTo, Keyword Research>
+<Search Engine Optimization, detects spam, News Search>
+<Search Result Display, connectedTo, Local SEO>
+<Semantic Search, connectedTo, Rank Tracking>
+<Shopping Search, connectedTo, Indexing Content>
+<Shopping Search, partOf, Shopping Search>
+<Site Architecture Optimization, connectedTo, User Intent Understanding>
+<User Experience for Search, connectedTo, Algorithm Updates Monitoring>
+<User Experience for Search, connectedTo, Click_Through Rate Optimization>
+<User Experience for Search, connectedTo, Paid Search Advertising>
+<Video Search, connectedTo, Featured Snippets Optimization>
+<Video Search, connectedTo, Keyword Research>
+<Video Search, connectedTo, Search Engine Optimization>
diff --git a/test/graphviz/graph_hard/graphviz_23.dot b/test/graphviz/graph_hard/graphviz_23.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8ae149757372bb72f1c6b96e3cb180783b082578
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_23.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=LR
+	N0 [label="Document Drafting" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N1 [label="Verdict Announcement" color="#7E57C2" fillcolor="#EDE7F6" shape=oval style=filled]
+	N2 [label=Notarization color="#388E3C" fillcolor="#C8E6C9" shape=plaintext style=filled]
+	N3 [label="Intel Property Licensing" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N4 [label="Plea Bargain" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N5 [label="Closing Argument" color="#388E3C" fillcolor="#C8E6C9" shape=Mdiamond style=filled]
+	N6 [label="Jury Selection" color="#7E57C2" fillcolor="#EDE7F6" shape=Mdiamond style=filled]
+	N7 [label="Witness Testimony" color="#FFCC80" fillcolor="#FFF0CC" shape=diamond style=filled]
+	N8 [label="Pro Bono Work" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N9 [label="Amicus Brief Submission" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N10 [label=Sentencing color="#FFCC80" fillcolor="#FFF0CC" shape=diamond style=filled]
+	N11 [label="Legal Research" color="#FFCC80" fillcolor="#FFF0CC" shape=oval style=filled]
+	N12 [label="Appeal Submission" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+	N13 [label="Discovery Process" color="#7E57C2" fillcolor="#EDE7F6" shape=oval style=filled]
+	N14 [label="Bankruptcy Filing" color="#388E3C" fillcolor="#C8E6C9" shape=octagon style=filled]
+	N15 [label=Enforcement color="#FFCC80" fillcolor="#FFF0CC" shape=octagon style=filled]
+	N16 [label="Settlement Negotiation" color="#7E57C2" fillcolor="#EDE7F6" shape=diamond style=filled]
+	N17 [label="Due Diligence" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N18 [label="Immigration Petition" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Child Custody" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Evidence Collection" color="#388E3C" fillcolor="#C8E6C9" shape=octagon style=filled]
+		nest0_1 [label=Cross_Examination color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+		nest0_2 [label="Arbitration Session" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+		nest0_0 -> nest0_1 [label=certifies color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Legal Consultation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Court Order Execution" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+		nest1_1 [label="Client Interview" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [label=protects color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N18 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N6 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N14 -> S0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N18 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S2 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N17 [label=drafts color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N15 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N11 -> M0 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N12 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N17 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N16 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_231.txt b/test/graphviz/graph_hard/graphviz_231.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1be1a5ddcae1c4216239aa40d259464299f1cdec
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_231.txt
@@ -0,0 +1,41 @@
+<Academic Search, connectedTo, Site Architecture Optimization>
+<Academic Search, manages PPC, Technical SEO>
+<Algorithm Updates Monitoring, connectedTo, International SEO>
+<Algorithm Updates Monitoring, connectedTo, Search Engine Marketing Strategy>
+<Algorithm Updates Monitoring, connectedTo, Search Engine Optimization>
+<Algorithm Updates Monitoring, connectedTo, Site Architecture Optimization>
+<Click_Through Rate Optimization, connectedTo, Indexing Content>
+<Click_Through Rate Optimization, connectedTo, Site Architecture Optimization>
+<Competitor Keyword Analysis, connectedTo, Algorithm Updates Monitoring>
+<Competitor Keyword Analysis, connectedTo, International SEO>
+<Competitor Keyword Analysis, connectedTo, Off_Page SEO>
+<Competitor Keyword Analysis, connectedTo, Search Engine Optimization>
+<Competitor Keyword Analysis, creates content, Site Architecture Optimization>
+<Competitor Keyword Analysis, generates featured snippets, International SEO>
+<Core Web Vitals Optimization, connectedTo, International SEO>
+<Indexing Content, connectedTo, Personalized Search Results>
+<International SEO, connectedTo, Click_Through Rate Optimization>
+<International SEO, connectedTo, Semantic Search>
+<Mobile_First Indexing, connectedTo, Penalties Recovery>
+<Mobile_First Indexing, partOf, Mobile_First Indexing>
+<Negative SEO Prevention, connectedTo, Competitor Keyword Analysis>
+<Negative SEO Prevention, connectedTo, Search Engine Optimization>
+<Negative SEO Prevention, connectedTo, Site Architecture Optimization>
+<News Search, connectedTo, Academic Search>
+<News Search, partOf, News Search>
+<Off_Page SEO, connectedTo, Penalties Recovery>
+<Off_Page SEO, connectedTo, Search Engine Optimization>
+<Penalties Recovery, connectedTo, Algorithm Updates Monitoring>
+<Personalized Search Results, connectedTo, Search Engine Marketing Strategy>
+<Search Engine Marketing Strategy, connectedTo, Academic Search>
+<Search Engine Optimization, connectedTo, Click_Through Rate Optimization>
+<Search Engine Optimization, connectedTo, Personalized Search Results>
+<Search Engine Optimization, connectedTo, Site Architecture Optimization>
+<Search Engine Optimization, designs site architecture, International SEO>
+<Search Engine Optimization, handles negative SEO, Core Web Vitals Optimization>
+<Semantic Search, connectedTo, News Search>
+<Semantic Search, partOf, Semantic Search>
+<Technical SEO, connectedTo, Video Search>
+<Technical SEO, partOf, Technical SEO>
+<Video Search, optimizes on_page, Mobile_First Indexing>
+<Video Search, partOf, Video Search>
diff --git a/test/graphviz/graph_hard/graphviz_233.dot b/test/graphviz/graph_hard/graphviz_233.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a2d8b19126b4ebfbdc2382cf2571bce6004a9f72
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_233.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=BT
+	N0 [label="Identity Threat Detection and Response" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N1 [label="Workforce Identity Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N2 [label="Federated Identity Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=folder style=filled]
+	N3 [label="Single Sign_On" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N4 [label="Verifiable Credentials" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N5 [label="Access Governance" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N6 [label=Non_Repudiation color="#4FC3F7" fillcolor="#E1F5FE" shape=parallelogram style=filled]
+	N7 [label="Identity Lifecycle Management" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N8 [label="Compliance with Data Protection Regulations" color="#A1D7CD" fillcolor="#EDF5F3" shape=diamond style=filled]
+	N9 [label="Identity Verification" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	N10 [label="KYC Integration" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	S1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Consent Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="API Security for Identity" color="#4FC3F7" fillcolor="#E1F5FE" shape=hexagon style=filled]
+		nest0_1 [label="Digital Signatures" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Adaptive Authentication" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Social Login Integration" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+		nest1_1 [label="Credential Management" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest1_2 [label="Digital Certificates" color="#4FC3F7" fillcolor="#E1F5FE" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="minimizes data" color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="manages wallets" color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label="provides verifiable proofs" color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label="assesses risks" color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N7 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N7 [label="stores attributes" color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N6 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N10 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_233.txt b/test/graphviz/graph_hard/graphviz_233.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8684823acba5f61ac8aeefa2595d38e8456dfad4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_233.txt
@@ -0,0 +1,34 @@
+<API Security for Identity, connectedTo, Digital Signatures>
+<API Security for Identity, partOf, API Security for Identity>
+<Access Governance, connectedTo, API Security for Identity>
+<Access Governance, minimizes data, Non_Repudiation>
+<Compliance with Data Protection Regulations, connectedTo, Identity Verification>
+<Credential Management, connectedTo, Digital Certificates>
+<Credential Management, partOf, Credential Management>
+<Digital Certificates, partOf, Digital Certificates>
+<Digital Certificates, stores attributes, Identity Lifecycle Management>
+<Digital Signatures, connectedTo, Identity Lifecycle Management>
+<Digital Signatures, partOf, Digital Signatures>
+<Federated Identity Management, connectedTo, Compliance with Data Protection Regulations>
+<Federated Identity Management, connectedTo, Single Sign_On>
+<Identity Lifecycle Management, connectedTo, KYC Integration>
+<Identity Lifecycle Management, provides verifiable proofs, Compliance with Data Protection Regulations>
+<Identity Threat Detection and Response, connectedTo, Verifiable Credentials>
+<Identity Threat Detection and Response, connectedTo, Workforce Identity Management>
+<Identity Verification, assesses risks, KYC Integration>
+<Non_Repudiation, connectedTo, Compliance with Data Protection Regulations>
+<Non_Repudiation, connectedTo, KYC Integration>
+<Non_Repudiation, manages wallets, Identity Lifecycle Management>
+<Single Sign_On, connectedTo, Compliance with Data Protection Regulations>
+<Single Sign_On, connectedTo, Identity Lifecycle Management>
+<Single Sign_On, connectedTo, Identity Verification>
+<Single Sign_On, connectedTo, Non_Repudiation>
+<Single Sign_On, connectedTo, Verifiable Credentials>
+<Social Login Integration, connectedTo, Credential Management>
+<Social Login Integration, partOf, Social Login Integration>
+<Verifiable Credentials, connectedTo, Access Governance>
+<Verifiable Credentials, connectedTo, Compliance with Data Protection Regulations>
+<Workforce Identity Management, connectedTo, Federated Identity Management>
+<Workforce Identity Management, connectedTo, KYC Integration>
+<Workforce Identity Management, connectedTo, Social Login Integration>
+<Workforce Identity Management, connectedTo, Verifiable Credentials>
diff --git a/test/graphviz/graph_hard/graphviz_235.dot b/test/graphviz/graph_hard/graphviz_235.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3c5e4f40645b9cee733ec93bddde66b7985f7581
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_235.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=LR
+	N0 [label="Course Evaluation" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N1 [label="Collaborative Projects" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+	N2 [label="Competency_Based Education" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N3 [label="Discussion Forum Moderation" color="#9C27B0" fillcolor="#E1BEE7" shape=hexagon style=filled]
+	N4 [label="Blended Learning Models" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N5 [label="Virtual Field Trips" color="#73C6BC" fillcolor="#D0EFEE" shape=oval style=filled]
+	N6 [label="Assessment Design" color="#9C27B0" fillcolor="#E1BEE7" shape=diamond style=filled]
+	N7 [label="Accreditation Management" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+	N8 [label="Bootcamp Development" color="#9C27B0" fillcolor="#E1BEE7" shape=oval style=filled]
+	N9 [label="Certification Issuance" color="#73C6BC" fillcolor="#D0EFEE" shape=parallelogram style=filled]
+	N10 [label="Virtual Labs and Simulations" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N11 [label="Virtual Classroom Facilitation" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N12 [label="Professional Development Courses" color="#9C27B0" fillcolor="#E1BEE7" shape=Mdiamond style=filled]
+	N13 [label="Learning Analytics" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N14 [label="Parent or Guardian Communication" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+	N15 [label="Enrollment and Retention Strategies" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	S0 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Test Preparation Courses" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Peer_to_Peer Learning" color="#73C6BC" fillcolor="#D0EFEE" shape=octagon style=filled]
+		nest0_1 [label="Micro_credential Programs" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Technical Support for Students" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Personalized Learning Paths" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+		nest1_1 [label="Open Educational Resources Integration" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+		nest1_2 [label="Instructor Training" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+		nest1_3 [label="Accessibility Features" color="#73C6BC" fillcolor="#D0EFEE" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
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+	N4 -> N5 [label="protects data privacy" color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
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+	N8 -> N9 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label="simulates labs" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest0_0 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N1 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N11 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
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+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [label="creates analytics dashboards" color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
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+	S2 -> N15 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
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+	N5 -> M0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
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+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
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+}
diff --git a/test/graphviz/graph_hard/graphviz_236.txt b/test/graphviz/graph_hard/graphviz_236.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f0c04a9b53f20bb2634405e612adb9589b26fd26
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_236.txt
@@ -0,0 +1,45 @@
+<Accreditation Management, connectedTo, Course Design>
+<Accreditation Management, connectedTo, Student Progress Tracking>
+<Assessment Design, connectedTo, Course Evaluation>
+<Assessment Design, partOf, Assessment Design>
+<Blended Learning Models, connectedTo, Synchronous Learning>
+<Blended Learning Models, partOf, Blended Learning Models>
+<Certification Issuance, connectedTo, Learning Analytics>
+<Certification Issuance, connectedTo, Technical Support for Students>
+<Certification Issuance, connectedTo, Test Preparation Courses>
+<Collaborative Projects, connectedTo, Parent or Guardian Communication>
+<Content Creation, connectedTo, Certification Issuance>
+<Content Creation, connectedTo, Student Progress Tracking>
+<Content Creation, connectedTo, Technical Support for Students>
+<Content Creation, connectedTo, Test Preparation Courses>
+<Course Design, connectedTo, Student Progress Tracking>
+<Course Design, connectedTo, Virtual Classroom Facilitation>
+<Course Evaluation, connectedTo, Instructor Training>
+<Course Evaluation, partOf, Course Evaluation>
+<Curriculum Development, connectedTo, Collaborative Projects>
+<Curriculum Development, connectedTo, Parent or Guardian Communication>
+<Curriculum Development, personalizes learning, Micro_credential Programs>
+<Gamification in Education, connectedTo, Blended Learning Models>
+<Gamification in Education, partOf, Gamification in Education>
+<Instructor Training, connectedTo, Student Progress Tracking>
+<Instructor Training, partOf, Instructor Training>
+<Learning Analytics, connectedTo, Peer_to_Peer Learning>
+<Learning Analytics, connectedTo, Student Progress Tracking>
+<Learning Analytics, connectedTo, Technical Support for Students>
+<Learning Analytics, connectedTo, Test Preparation Courses>
+<Micro_credential Programs, connectedTo, Assessment Design>
+<Micro_credential Programs, connectedTo, Collaborative Projects>
+<Peer_to_Peer Learning, partOf, Peer_to_Peer Learning>
+<Peer_to_Peer Learning, uses AR or VR for learning, Gamification in Education>
+<Student Progress Tracking, connectedTo, Technical Support for Students>
+<Synchronous Learning, connectedTo, Virtual Classroom Facilitation>
+<Synchronous Learning, partOf, Synchronous Learning>
+<Technical Support for Students, connectedTo, Collaborative Projects>
+<Technical Support for Students, connectedTo, Curriculum Development>
+<Technical Support for Students, connectedTo, Parent or Guardian Communication>
+<Technical Support for Students, connectedTo, Test Preparation Courses>
+<Technical Support for Students, delivers lectures, Micro_credential Programs>
+<Test Preparation Courses, connectedTo, Curriculum Development>
+<Virtual Classroom Facilitation, connectedTo, Content Creation>
+<Virtual Classroom Facilitation, connectedTo, Test Preparation Courses>
+<Virtual Classroom Facilitation, offers online tutoring, Student Progress Tracking>
diff --git a/test/graphviz/graph_hard/graphviz_237.dot b/test/graphviz/graph_hard/graphviz_237.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4775b881d8dc39c71163faabd12e8720a48e8ec9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_237.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=BT
+	N0 [label="Enrollment and Retention Strategies" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N1 [label="Content Creation" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N2 [label="Virtual Field Trips" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N3 [label="Assessment Design" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
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+	N5 [label="Test Preparation Courses" color="#F06292" fillcolor="#FCE4EC" shape=oval style=filled]
+	N6 [label="Adaptive Learning Technologies" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
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+	N8 [label="Virtual Classroom Facilitation" color="#FFF176" fillcolor="#FFFDE7" shape=plaintext style=filled]
+	N9 [label="Accessibility Features" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N10 [label="Interactive Learning Activities" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N11 [label="Digital Badges" color="#CD8FF2" fillcolor="#ECCFF5" shape=octagon style=filled]
+	N12 [label="Micro_credential Programs" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N13 [label="Certification Issuance" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N14 [label="Open Educational Resources Integration" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N15 [label="Discussion Forum Moderation" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	S0 [label="" color="#F06292" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
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+		nest0_1 [label="Online Tutoring" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Synchronous Learning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Course Evaluation" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+		nest1_1 [label="Course Design" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+		nest1_2 [label="Learning Management System Administration" color="#F06292" fillcolor="#FCE4EC" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label="uses blockchain for credentials" color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	}
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+	N13 -> nest1_0 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
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+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
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+	N3 -> M1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [label="supports competency_based" color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [label="manages enrollments" color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#F06292" dir=forward penwidth=1.5 style=solid]
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+}
diff --git a/test/graphviz/graph_hard/graphviz_237.txt b/test/graphviz/graph_hard/graphviz_237.txt
new file mode 100644
index 0000000000000000000000000000000000000000..275bed240856524a44c294ab2846ddfc251fab5b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_237.txt
@@ -0,0 +1,44 @@
+<Accessibility Features, connectedTo, Interactive Learning Activities>
+<Adaptive Learning Technologies, connectedTo, Personalized Learning Paths>
+<Assessment Design, connectedTo, Adaptive Learning Technologies>
+<Assessment Design, connectedTo, Digital Badges>
+<Assessment Design, connectedTo, Micro_credential Programs>
+<Assessment Design, connectedTo, Peer_to_Peer Learning>
+<Assessment Design, connectedTo, Personalized Learning Paths>
+<Assessment Design, connectedTo, Test Preparation Courses>
+<Assessment Design, connectedTo, Virtual Classroom Facilitation>
+<Certification Issuance, connectedTo, Course Evaluation>
+<Certification Issuance, connectedTo, Open Educational Resources Integration>
+<Content Creation, connectedTo, Interactive Learning Activities>
+<Content Creation, connectedTo, Test Preparation Courses>
+<Content Creation, connectedTo, Virtual Classroom Facilitation>
+<Content Creation, connectedTo, Virtual Field Trips>
+<Course Design, partOf, Course Design>
+<Course Design, uses blockchain for credentials, Learning Management System Administration>
+<Course Evaluation, connectedTo, Course Design>
+<Course Evaluation, partOf, Course Evaluation>
+<Digital Badges, connectedTo, Micro_credential Programs>
+<Enrollment and Retention Strategies, connectedTo, Content Creation>
+<Enrollment and Retention Strategies, connectedTo, Interactive Learning Activities>
+<Enrollment and Retention Strategies, manages enrollments, Test Preparation Courses>
+<Interactive Learning Activities, connectedTo, Digital Badges>
+<Learning Management System Administration, connectedTo, Virtual Classroom Facilitation>
+<Learning Management System Administration, partOf, Learning Management System Administration>
+<Micro_credential Programs, connectedTo, Certification Issuance>
+<Online Tutoring, connectedTo, Accessibility Features>
+<Online Tutoring, partOf, Online Tutoring>
+<Open Educational Resources Integration, connectedTo, Discussion Forum Moderation>
+<Peer_to_Peer Learning, connectedTo, Interactive Learning Activities>
+<Peer_to_Peer Learning, connectedTo, Test Preparation Courses>
+<Peer_to_Peer Learning, connectedTo, Virtual Classroom Facilitation>
+<Personalized Learning Paths, connectedTo, Virtual Classroom Facilitation>
+<Test Preparation Courses, connectedTo, Accessibility Features>
+<Test Preparation Courses, connectedTo, Adaptive Learning Technologies>
+<Test Preparation Courses, connectedTo, Certification Issuance>
+<Test Preparation Courses, connectedTo, Interactive Learning Activities>
+<Test Preparation Courses, connectedTo, Virtual Labs and Simulations>
+<Virtual Classroom Facilitation, connectedTo, Accessibility Features>
+<Virtual Field Trips, connectedTo, Assessment Design>
+<Virtual Field Trips, supports competency_based, Test Preparation Courses>
+<Virtual Labs and Simulations, connectedTo, Online Tutoring>
+<Virtual Labs and Simulations, partOf, Virtual Labs and Simulations>
diff --git a/test/graphviz/graph_hard/graphviz_238.txt b/test/graphviz/graph_hard/graphviz_238.txt
new file mode 100644
index 0000000000000000000000000000000000000000..283a73baaff78a6bbc11e7a6c72c93eb274d9eff
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_238.txt
@@ -0,0 +1,46 @@
+<Career Pathway Mapping, connectedTo, Gamification for Engagement>
+<Certificate of Completion Issuance, connectedTo, Course Retirement Planning>
+<Certificate of Completion Issuance, partOf, Certificate of Completion Issuance>
+<Completion Rate Optimization, connectedTo, Marketing to Global Audience>
+<Continuous Course Improvement, connectedTo, Course Pilot Testing>
+<Continuous Course Improvement, connectedTo, Skill_Based Learning Outcomes>
+<Continuous Course Improvement, connectedTo, Technical Infrastructure for Scale>
+<Corporate Training Solutions, connectedTo, Course Pilot Testing>
+<Course Pilot Testing, connectedTo, Career Pathway Mapping>
+<Course Pilot Testing, connectedTo, Skill_Based Learning Outcomes>
+<Course Retirement Planning, connectedTo, Corporate Training Solutions>
+<Course Retirement Planning, partOf, Course Retirement Planning>
+<Discussion Forum Management, connectedTo, Completion Rate Optimization>
+<Employer Recognition, connectedTo, Corporate Training Solutions>
+<Employer Recognition, connectedTo, Course Pilot Testing>
+<Financial Aid for Learners, connectedTo, Self_Paced Learning Tracks>
+<Financial Aid for Learners, partOf, Financial Aid for Learners>
+<Gamification for Engagement, connectedTo, Mobile Learning Experience>
+<Industry Collaboration for Content, supports learners, Discussion Forum Management>
+<Learner Feedback Analysis, connectedTo, Skill_Based Learning Outcomes>
+<Marketing to Global Audience, connectedTo, University Partnerships>
+<Mobile Learning Experience, connectedTo, Financial Aid for Learners>
+<Mobile Learning Experience, connectedTo, Peer Grading Implementation>
+<Mobile Learning Experience, connectedTo, Platform Selection>
+<Peer Grading Implementation, connectedTo, Certificate of Completion Issuance>
+<Peer Grading Implementation, partOf, Peer Grading Implementation>
+<Platform Selection, connectedTo, Completion Rate Optimization>
+<Platform Selection, connectedTo, Industry Collaboration for Content>
+<Platform Selection, connectedTo, Learner Feedback Analysis>
+<Platform Selection, connectedTo, Marketing to Global Audience>
+<Platform Selection, connectedTo, Subscription Models>
+<Platform Selection, connectedTo, Verified Track Management>
+<Self_Paced Learning Tracks, connectedTo, Course Pilot Testing>
+<Self_Paced Learning Tracks, partOf, Self_Paced Learning Tracks>
+<Skill_Based Learning Outcomes, connectedTo, Industry Collaboration for Content>
+<Subscription Models, connectedTo, Learner Feedback Analysis>
+<Technical Infrastructure for Scale, connectedTo, Course Pilot Testing>
+<Technical Infrastructure for Scale, connectedTo, Video Lecture Production>
+<University Partnerships, connectedTo, Micro_credential Stacking>
+<Verified Track Management, connectedTo, Discussion Forum Management>
+<Verified Track Management, connectedTo, Subscription Models>
+<Verified Track Management, connectedTo, University Partnerships>
+<Verified Track Management, expands reach, Completion Rate Optimization>
+<Video Lecture Production, connectedTo, Employer Recognition>
+<Video Lecture Production, connectedTo, Skill_Based Learning Outcomes>
+<Video Lecture Production, issues statements of accomplishment, Course Pilot Testing>
diff --git a/test/graphviz/graph_hard/graphviz_239.dot b/test/graphviz/graph_hard/graphviz_239.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2a967ac9587d3bf41f730ce2cdead6b2bd605b36
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_239.dot
@@ -0,0 +1,58 @@
+digraph {
+	rankdir=TD
+	N0 [label="Content Licensing" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N1 [label="Learner Support" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N2 [label="Global Accessibility Features" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+	N3 [label="Learner Feedback Analysis" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N4 [label="Mobile Learning Experience" color="#4DD0E1" fillcolor="#C9F0F0" shape=parallelogram style=filled]
+	N5 [label="Corporate Training Solutions" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N6 [label="Video Lecture Production" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N7 [label="Gamification for Engagement" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N8 [label="Translation and Localization" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N9 [label="Peer Grading Implementation" color="#FFE69C" fillcolor="#FFF9D4" shape=octagon style=filled]
+	N10 [label="Instructor_Led Sessions" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	S0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Discussion Forum Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="University Partnerships" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest0_1 [label="Employer Recognition" color="#FFE69C" fillcolor="#FFF9D4" shape=octagon style=filled]
+		nest0_2 [label="Course Content Development" color="#4DD0E1" fillcolor="#C9F0F0" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Financial Aid for Learners" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Industry Collaboration for Content" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+		nest1_1 [label="Subscription Models" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_24.dot b/test/graphviz/graph_hard/graphviz_24.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6dad4cadacaf6fdf176eba5c374fb6e387de1242
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_24.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=BT
+	N0 [label="Settlement Negotiation" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N1 [label="Legal Research" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N2 [label="Intel Property Licensing" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N3 [label="Arbitration Session" color="#CD8FF2" fillcolor="#ECCFF5" shape=plaintext style=filled]
+	N4 [label="Contract Review" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N5 [label="Witness Testimony" color="#E57373" fillcolor="#FFEBEE" shape=Mdiamond style=filled]
+	N6 [label="Trial Session" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N7 [label="Legal Consultation" color="#FFE470" fillcolor="#FFFAE0" shape=oval style=filled]
+	N8 [label="Divorce Proceedings" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N9 [label="Amicus Brief Submission" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	S0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Pre_Trial Hearing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Evidence Collection" color="#E57373" fillcolor="#FFEBEE" shape=oval style=filled]
+		nest0_1 [label="Corporate Formation" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label=Enforcement labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Sentencing color="#E57373" fillcolor="#FFEBEE" shape=octagon style=filled]
+		nest1_1 [label="Estate Planning" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N1 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N4 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [label=arbitrates color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [label=notarizes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	M2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_24.txt b/test/graphviz/graph_hard/graphviz_24.txt
new file mode 100644
index 0000000000000000000000000000000000000000..66d1fd4027fc0fd5ce2bf3ccb75f9450fcca821a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_24.txt
@@ -0,0 +1,29 @@
+<Arbitration Session, connectedTo, Contract Review>
+<Arbitration Session, connectedTo, Legal Consultation>
+<Contract Review, connectedTo, Witness Testimony>
+<Corporate Formation, connectedTo, Legal Research>
+<Corporate Formation, partOf, Corporate Formation>
+<Divorce Proceedings, connectedTo, Amicus Brief Submission>
+<Divorce Proceedings, connectedTo, Evidence Collection>
+<Divorce Proceedings, connectedTo, Sentencing>
+<Estate Planning, connectedTo, Contract Review>
+<Estate Planning, partOf, Estate Planning>
+<Evidence Collection, connectedTo, Corporate Formation>
+<Evidence Collection, partOf, Evidence Collection>
+<Intel Property Licensing, connectedTo, Amicus Brief Submission>
+<Intel Property Licensing, connectedTo, Arbitration Session>
+<Intel Property Licensing, connectedTo, Legal Consultation>
+<Intel Property Licensing, connectedTo, Trial Session>
+<Intel Property Licensing, notarizes, Contract Review>
+<Legal Consultation, connectedTo, Divorce Proceedings>
+<Legal Research, arbitrates, Witness Testimony>
+<Legal Research, connectedTo, Contract Review>
+<Legal Research, connectedTo, Divorce Proceedings>
+<Legal Research, connectedTo, Intel Property Licensing>
+<Sentencing, connectedTo, Estate Planning>
+<Sentencing, partOf, Sentencing>
+<Settlement Negotiation, connectedTo, Contract Review>
+<Settlement Negotiation, connectedTo, Legal Consultation>
+<Settlement Negotiation, connectedTo, Legal Research>
+<Trial Session, connectedTo, Legal Consultation>
+<Witness Testimony, connectedTo, Trial Session>
diff --git a/test/graphviz/graph_hard/graphviz_241.txt b/test/graphviz/graph_hard/graphviz_241.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b7cd854ee3c078fe52e593bae0d71928e98f6961
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_241.txt
@@ -0,0 +1,36 @@
+<Adaptive Learning Algorithms, develops, Test_Taking Strategies>
+<Adaptive Learning Algorithms, partOf, Adaptive Learning Algorithms>
+<Certification Exam Prep, connectedTo, Mock Exam Administration>
+<Curriculum Development, connectedTo, Graduate School Exam Prep>
+<Curriculum Development, partOf, Curriculum Development>
+<Exam Day Tips, connectedTo, Curriculum Development>
+<Exam Day Tips, connectedTo, Test_Taking Strategies>
+<Flashcard Creation, connectedTo, Certification Exam Prep>
+<Flashcard Creation, connectedTo, Interactive Exercises>
+<Flashcard Creation, connectedTo, Mock Exam Administration>
+<Flashcard Creation, connectedTo, Video Lecture Production>
+<Graduate School Exam Prep, connectedTo, Adaptive Learning Algorithms>
+<Graduate School Exam Prep, partOf, Graduate School Exam Prep>
+<Memory Techniques Training, connectedTo, Subject Matter Review>
+<Mock Exam Administration, connectedTo, Interactive Exercises>
+<Motivation Coaching, connectedTo, Test_Taking Strategies>
+<Motivation Coaching, connectedTo, Time Management Coaching>
+<Motivation Coaching, improves, Interactive Exercises>
+<Parent or Guardian Updates, connectedTo, Certification Exam Prep>
+<Parent or Guardian Updates, connectedTo, Virtual Proctoring>
+<Parent or Guardian Updates, provides, Exam Day Tips>
+<Performance Feedback, partOf, Performance Feedback>
+<Performance Feedback, prepares, Study Material Design>
+<Professional Licensure Exam Prep, connectedTo, Certification Exam Prep>
+<Professional Licensure Exam Prep, connectedTo, Flashcard Creation>
+<Study Environment Optimization, connectedTo, Certification Exam Prep>
+<Study Environment Optimization, connectedTo, Motivation Coaching>
+<Study Material Design, coaches, Time Management Coaching>
+<Study Material Design, partOf, Study Material Design>
+<Subject Matter Review, connectedTo, Certification Exam Prep>
+<Subject Matter Review, facilitates, Study Environment Optimization>
+<Test_Taking Strategies, connectedTo, Certification Exam Prep>
+<Time Management Coaching, connectedTo, Professional Licensure Exam Prep>
+<Video Lecture Production, connectedTo, Parent or Guardian Updates>
+<Virtual Proctoring, connectedTo, Performance Feedback>
+<Virtual Proctoring, partOf, Virtual Proctoring>
diff --git a/test/graphviz/graph_hard/graphviz_242.dot b/test/graphviz/graph_hard/graphviz_242.dot
new file mode 100644
index 0000000000000000000000000000000000000000..37093457ff678c179db1e889a7d5fb104cc1e98c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_242.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=TD
+	N0 [label="Practice Test Creation" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N1 [label="Math Skills Refresher" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N2 [label="College Entrance Exam Prep" color="#00BCD4" fillcolor="#E0F7FA" shape=Mdiamond style=filled]
+	N3 [label="Tutoring Session" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N4 [label="Study Environment Optimization" color="#6EB76D" fillcolor="#E9F7E8" shape=octagon style=filled]
+	N5 [label="AI_Powered Tutoring" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N6 [label="Online Course Delivery" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N7 [label="Writing Skills Improvement" color="#6EB76D" fillcolor="#E9F7E8" shape=Mdiamond style=filled]
+	N8 [label="Certification Exam Prep" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N9 [label="Motivation Coaching" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N10 [label="Score Analysis" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	S0 [label="" color="#6EB76D" fillcolor="#E9F7E8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#6EB76D" fillcolor="#E9F7E8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="History Topic Mastery" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Exam Day Tips" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+		nest0_1 [label="Student Progress Tracking" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+		nest0_2 [label="Flashcard Creation" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+		nest0_3 [label="Mock Exam Administration" color="#6EB76D" fillcolor="#E9F7E8" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Study Material Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Subject Matter Review" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+		nest1_1 [label="Memory Techniques Training" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+		nest1_2 [label="Performance Prediction Models" color="#B8C0F5" fillcolor="#ECF0FD" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=counsels color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=prepares color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N5 -> S2 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [label=remediates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [label=distributes color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label=supports color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_242.txt b/test/graphviz/graph_hard/graphviz_242.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1634cbd74b4f53b77ec055f8635dca0324ce3a8c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_242.txt
@@ -0,0 +1,38 @@
+<AI_Powered Tutoring, connectedTo, Certification Exam Prep>
+<AI_Powered Tutoring, connectedTo, Online Course Delivery>
+<AI_Powered Tutoring, connectedTo, Score Analysis>
+<AI_Powered Tutoring, connectedTo, Writing Skills Improvement>
+<AI_Powered Tutoring, distributes, Writing Skills Improvement>
+<AI_Powered Tutoring, remediates, Motivation Coaching>
+<Certification Exam Prep, connectedTo, Motivation Coaching>
+<College Entrance Exam Prep, connectedTo, Online Course Delivery>
+<College Entrance Exam Prep, connectedTo, Tutoring Session>
+<Exam Day Tips, connectedTo, Student Progress Tracking>
+<Exam Day Tips, partOf, Exam Day Tips>
+<Flashcard Creation, connectedTo, Mock Exam Administration>
+<Flashcard Creation, partOf, Flashcard Creation>
+<Math Skills Refresher, connectedTo, College Entrance Exam Prep>
+<Math Skills Refresher, connectedTo, Online Course Delivery>
+<Math Skills Refresher, connectedTo, Tutoring Session>
+<Math Skills Refresher, connectedTo, Writing Skills Improvement>
+<Memory Techniques Training, counsels, Performance Prediction Models>
+<Memory Techniques Training, partOf, Memory Techniques Training>
+<Mock Exam Administration, connectedTo, AI_Powered Tutoring>
+<Mock Exam Administration, partOf, Mock Exam Administration>
+<Motivation Coaching, prepares, Score Analysis>
+<Online Course Delivery, connectedTo, Writing Skills Improvement>
+<Performance Prediction Models, connectedTo, Tutoring Session>
+<Performance Prediction Models, partOf, Performance Prediction Models>
+<Practice Test Creation, connectedTo, Math Skills Refresher>
+<Practice Test Creation, supports, Online Course Delivery>
+<Student Progress Tracking, connectedTo, Flashcard Creation>
+<Student Progress Tracking, partOf, Student Progress Tracking>
+<Study Environment Optimization, connectedTo, AI_Powered Tutoring>
+<Study Environment Optimization, connectedTo, Exam Day Tips>
+<Study Environment Optimization, connectedTo, Subject Matter Review>
+<Study Environment Optimization, connectedTo, Writing Skills Improvement>
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+<Subject Matter Review, partOf, Subject Matter Review>
+<Tutoring Session, connectedTo, Online Course Delivery>
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new file mode 100644
index 0000000000000000000000000000000000000000..1ef523758efd7e1d3cffebc070c8cf2009c1975a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_243.dot
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diff --git a/test/graphviz/graph_hard/graphviz_243.txt b/test/graphviz/graph_hard/graphviz_243.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bc41a0ed2a2c856e1e0dcf66f9b18fba529304fa
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_243.txt
@@ -0,0 +1,35 @@
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+<College Entrance Exam Prep, connectedTo, Practice Test Creation>
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+<Flashcard Creation, partOf, Flashcard Creation>
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+<Mock Exam Administration, connectedTo, Subject Matter Review>
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+<Performance Feedback, remediates, Practice Test Creation>
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+<Reading Comprehension Drills, connectedTo, Subject Matter Review>
+<Science Concept Review, connectedTo, Virtual Proctoring>
+<Science Concept Review, partOf, Science Concept Review>
+<Score Analysis, connectedTo, Practice Test Creation>
+<Study Environment Optimization, connectedTo, Science Concept Review>
+<Study Environment Optimization, partOf, Study Environment Optimization>
+<Study Material Design, connectedTo, Writing Skills Improvement>
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+<Test_Taking Strategies, connectedTo, Reading Comprehension Drills>
+<Virtual Proctoring, connectedTo, Critical Thinking Development>
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diff --git a/test/graphviz/graph_hard/graphviz_244.dot b/test/graphviz/graph_hard/graphviz_244.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2b3cad4d06a2bdb89c510f68b2666a985ccee3dd
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_244.dot
@@ -0,0 +1,62 @@
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diff --git a/test/graphviz/graph_hard/graphviz_244.txt b/test/graphviz/graph_hard/graphviz_244.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e58f9f9d1aea4977d6acdaae5cf54f2da4a8de37
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_244.txt
@@ -0,0 +1,32 @@
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diff --git a/test/graphviz/graph_hard/graphviz_245.dot b/test/graphviz/graph_hard/graphviz_245.dot
new file mode 100644
index 0000000000000000000000000000000000000000..149af6e87f2e2e2aba4488430d4ae47079ff3a89
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_245.dot
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diff --git a/test/graphviz/graph_hard/graphviz_245.txt b/test/graphviz/graph_hard/graphviz_245.txt
new file mode 100644
index 0000000000000000000000000000000000000000..16ee742ec0b9c26196044f038a1e97fe5439162c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_245.txt
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+<Gamified Learning Activities, connectedTo, Virtual Reality Language Environments>
+<Gamified Learning Activities, distributes, Language for Specific Purposes>
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+<Immersion Programs, partOf, Immersion Programs>
+<Language for Specific Purposes, connectedTo, Role_Playing Scenarios>
+<Language for Specific Purposes, connectedTo, Virtual Reality Language Environments>
+<Language for Specific Purposes, connectedTo, Vocabulary Acquisition>
+<Progress Tracking, connectedTo, Accent Reduction Coaching>
+<Pronunciation Drills, connectedTo, Immersion Programs>
+<Pronunciation Drills, partOf, Pronunciation Drills>
+<Reading Comprehension, corrects, Writing Exercises>
+<Reading Comprehension, partOf, Reading Comprehension>
+<Role_Playing Scenarios, connectedTo, Virtual Reality Language Environments>
+<Translation Exercises, connectedTo, Curriculum Customization>
+<Translation Exercises, partOf, Translation Exercises>
+<Vocabulary Acquisition, connectedTo, Progress Tracking>
+<Vocabulary Acquisition, connectedTo, Role_Playing Scenarios>
+<Vocabulary Acquisition, connectedTo, Virtual Reality Language Environments>
+<Writing Exercises, connectedTo, Translation Exercises>
+<Writing Exercises, partOf, Writing Exercises>
diff --git a/test/graphviz/graph_hard/graphviz_246.dot b/test/graphviz/graph_hard/graphviz_246.dot
new file mode 100644
index 0000000000000000000000000000000000000000..afbc543b549249b896e11d8b1668fdd4ef2dd922
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_246.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=RL
+	N0 [label="Travel Language Essentials" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N1 [label="Listening Comprehension" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N2 [label="Online Tutoring Sessions" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+	N3 [label="Gamified Learning Activities" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N4 [label="Virtual Reality Language Environments" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N5 [label="Language Assessment Tests" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+	N6 [label="Native Speaker Interaction" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N7 [label="Speaking Practice" color="#CD8FF2" fillcolor="#ECCFF5" shape=folder style=filled]
+	N8 [label="Grammar Practice" color="#CD8FF2" fillcolor="#ECCFF5" shape=Mdiamond style=filled]
+	N9 [label="Language Exchange Programs" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N10 [label="Writing Exercises" color="#FF5722" fillcolor="#FFCCBC" shape=folder style=filled]
+	N11 [label="Audio Lessons" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	S0 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Cultural Immersion" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Business Language Training" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+		nest0_1 [label="Role_Playing Scenarios" color="#CD8FF2" fillcolor="#ECCFF5" shape=plaintext style=filled]
+		nest0_2 [label="Interactive Dialogues" color="#FFB2A5" fillcolor="#FFDCD6" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Progress Tracking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Personalized Learning Paths" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+		nest1_1 [label="Video Lessons" color="#FF5722" fillcolor="#FFCCBC" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=immerses color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=markets color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=learns color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N3 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N3 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_246.txt b/test/graphviz/graph_hard/graphviz_246.txt
new file mode 100644
index 0000000000000000000000000000000000000000..da2216d3d58e32974cd13fec3b3329e863d2cac0
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_246.txt
@@ -0,0 +1,31 @@
+<Business Language Training, connectedTo, Role_Playing Scenarios>
+<Business Language Training, partOf, Business Language Training>
+<Gamified Learning Activities, connectedTo, Native Speaker Interaction>
+<Gamified Learning Activities, connectedTo, Virtual Reality Language Environments>
+<Grammar Practice, connectedTo, Language Exchange Programs>
+<Interactive Dialogues, connectedTo, Online Tutoring Sessions>
+<Interactive Dialogues, partOf, Interactive Dialogues>
+<Language Assessment Tests, connectedTo, Native Speaker Interaction>
+<Language Exchange Programs, connectedTo, Writing Exercises>
+<Listening Comprehension, connectedTo, Gamified Learning Activities>
+<Listening Comprehension, connectedTo, Grammar Practice>
+<Listening Comprehension, connectedTo, Online Tutoring Sessions>
+<Listening Comprehension, connectedTo, Speaking Practice>
+<Native Speaker Interaction, connectedTo, Grammar Practice>
+<Native Speaker Interaction, connectedTo, Writing Exercises>
+<Native Speaker Interaction, markets, Speaking Practice>
+<Online Tutoring Sessions, connectedTo, Gamified Learning Activities>
+<Online Tutoring Sessions, connectedTo, Personalized Learning Paths>
+<Personalized Learning Paths, connectedTo, Video Lessons>
+<Personalized Learning Paths, partOf, Personalized Learning Paths>
+<Role_Playing Scenarios, connectedTo, Interactive Dialogues>
+<Role_Playing Scenarios, partOf, Role_Playing Scenarios>
+<Speaking Practice, learns, Grammar Practice>
+<Travel Language Essentials, connectedTo, Native Speaker Interaction>
+<Travel Language Essentials, immerses, Listening Comprehension>
+<Video Lessons, connectedTo, Gamified Learning Activities>
+<Video Lessons, partOf, Video Lessons>
+<Virtual Reality Language Environments, connectedTo, Business Language Training>
+<Virtual Reality Language Environments, connectedTo, Language Assessment Tests>
+<Virtual Reality Language Environments, connectedTo, Native Speaker Interaction>
+<Writing Exercises, connectedTo, Audio Lessons>
diff --git a/test/graphviz/graph_hard/graphviz_248.dot b/test/graphviz/graph_hard/graphviz_248.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d06bb34076662d2464399a05747993f9134f27aa
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_248.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=TD
+	N0 [label="Workplace Mental Health Programs" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N1 [label="Schizophrenia Management" color="#94C0C0" fillcolor="#CADEDE" shape=Mdiamond style=filled]
+	N2 [label="Crisis Intervention" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+	N3 [label="Digital Mental Health Tools" color="#80DDEA" fillcolor="#D3F7F9" shape=octagon style=filled]
+	N4 [label="Mental Health Education" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+	N5 [label="Music Therapy" color="#94C0C0" fillcolor="#CADEDE" shape=folder style=filled]
+	N6 [label="Art Therapy" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N7 [label="Eating Disorder Treatment" color="#94C0C0" fillcolor="#CADEDE" shape=folder style=filled]
+	N8 [label="Emotional Regulation Training" color="#80DDEA" fillcolor="#D3F7F9" shape=diamond style=filled]
+	N9 [label="Dialectical Behavior Therapy" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+	N10 [label="Anxiety Management" color="#80DDEA" fillcolor="#D3F7F9" shape=parallelogram style=filled]
+	N11 [label="Advocacy for Mental Health" color="#94C0C0" fillcolor="#CADEDE" shape=Mdiamond style=filled]
+	N12 [label="Group Therapy" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+	N13 [label="Family Therapy" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N14 [label="Treatment Plan Development" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+	N15 [label="Depression Treatment" color="#80DDEA" fillcolor="#D3F7F9" shape=Mdiamond style=filled]
+	N16 [label="Bipolar Disorder Management" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N17 [label="Coping Skill Development" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N18 [label="Mental Health Screening" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N19 [label="Child & Adolescent Therapy" color="#80DDEA" fillcolor="#D3F7F9" shape=plaintext style=filled]
+	N20 [label="Post_Traumatic Stress Disorder Support" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	S0 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Cognitive Behavioral Therapy" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Medication Management" color="#64B5F6" fillcolor="#E3F2FD" shape=parallelogram style=filled]
+		nest0_1 [label="Substance Abuse Counseling" color="#64B5F6" fillcolor="#E3F2FD" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Inpatient Treatment Coordination" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Support Group Facilitation" color="#64B5F6" fillcolor="#E3F2FD" shape=plaintext style=filled]
+		nest1_1 [label="Recreational Therapy" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+		nest1_0 -> nest1_1 [label=develops color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=educates color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=secures color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [label=researches color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N18 -> N19 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N19 -> N20 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N16 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N11 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [label=innovates color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S1 -> N19 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M0 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N14 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N12 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N10 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N14 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_249.dot b/test/graphviz/graph_hard/graphviz_249.dot
new file mode 100644
index 0000000000000000000000000000000000000000..840f1615e341eb0d7393a832d2b9f3b3b67f533d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_249.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=TD
+	N0 [label="Peer Support Programs" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N1 [label="Trauma Therapy" color="#00BCD4" fillcolor="#B2EBF2" shape=parallelogram style=filled]
+	N2 [label="Telehealth Counseling" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+	N3 [label="Substance Abuse Counseling" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N4 [label="Suicide Prevention" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N5 [label="Cognitive Behavioral Therapy" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N6 [label="Digital Mental Health Tools" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N7 [label="Mental Health Education" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N8 [label="Recreational Therapy" color="#00BCD4" fillcolor="#B2EBF2" shape=folder style=filled]
+	N9 [label="Child & Adolescent Therapy" color="#00BCD4" fillcolor="#B2EBF2" shape=parallelogram style=filled]
+	N10 [label="Relapse Prevention" color="#00BCD4" fillcolor="#B2EBF2" shape=plaintext style=filled]
+	N11 [label="Coping Skill Development" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N12 [label="Mental Health Screening" color="#CB9BE1" fillcolor="#F2E6F5" shape=oval style=filled]
+	N13 [label="Depression Treatment" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N14 [label="Workplace Mental Health Programs" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	N15 [label="Medication Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=plaintext style=filled]
+	N16 [label="Grief Counseling" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Stress Reduction Techniques" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Emotional Regulation Training" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+		nest0_1 [label="Diagnosis and Assessment" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Advocacy for Mental Health" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Treatment Plan Development" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+		nest1_1 [label="Post_Traumatic Stress Disorder Support" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+		nest1_2 [label="Group Therapy" color="#CB9BE1" fillcolor="#F2E6F5" shape=oval style=filled]
+		nest1_0 -> nest1_1 [label=guides color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=medicates color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=trains color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N8 [label=innovates color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [label=protects color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [label=facilitates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M1 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N13 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N16 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_25.dot b/test/graphviz/graph_hard/graphviz_25.dot
new file mode 100644
index 0000000000000000000000000000000000000000..53f73e6b8bc846f502acb0697b029179a4dfd23e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_25.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=TD
+	N0 [label="Carrier Selection" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N1 [label="Container Loading" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N2 [label="Customs Declaration" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+	N3 [label="Delay Notification" color="#673AB7" fillcolor="#D1C4E9" shape=plaintext style=filled]
+	N4 [label="Global Trade Compliance" color="#673AB7" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+	N5 [label="Route Optimization Software" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N6 [label="Route Assignment" color="#FFC085" fillcolor="#FFDAB9" shape=oval style=filled]
+	N7 [label="Air Cargo Handling" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N8 [label="Damage Reporting" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N9 [label="Delivery Confirmation" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N10 [label="Return Logistics" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N11 [label="Vehicle Loading" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N12 [label="Cargo Tracking" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N13 [label="Last_mile Dispatch" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N14 [label="Customs Clearance" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N15 [label="Packing Process" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	S0 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Hazardous Material Transport" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Driver Check_in" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+		nest0_1 [label="Invoice Matching" color="#607D8B" fillcolor="#CFD8DC" shape=octagon style=filled]
+		nest0_2 [label="Freight Booking" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+		nest0_3 [label="Fleet Maintenance Scheduling" color="#673AB7" fillcolor="#D1C4E9" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label=Cross_docking labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Consolidation color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+		nest1_1 [label="Yard Management" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+		nest1_2 [label="Hub Transfer" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [label=insures color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=delivers color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=matches color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N12 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N6 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S0 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [label=reports color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [label="checks in" color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S1 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [label=optimizes color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N13 -> M2 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M2 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N15 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_25.txt b/test/graphviz/graph_hard/graphviz_25.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5222222d44fd9e634b059bb61ec7baac92fa428e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_25.txt
@@ -0,0 +1,41 @@
+<Air Cargo Handling, connectedTo, Damage Reporting>
+<Air Cargo Handling, connectedTo, Packing Process>
+<Air Cargo Handling, connectedTo, Return Logistics>
+<Cargo Tracking, connectedTo, Consolidation>
+<Cargo Tracking, connectedTo, Last_mile Dispatch>
+<Carrier Selection, connectedTo, Container Loading>
+<Consolidation, connectedTo, Yard Management>
+<Consolidation, partOf, Consolidation>
+<Container Loading, connectedTo, Customs Declaration>
+<Customs Clearance, connectedTo, Packing Process>
+<Customs Declaration, connectedTo, Delay Notification>
+<Customs Declaration, connectedTo, Packing Process>
+<Damage Reporting, connectedTo, Cargo Tracking>
+<Damage Reporting, connectedTo, Vehicle Loading>
+<Damage Reporting, matches, Delivery Confirmation>
+<Delay Notification, connectedTo, Global Trade Compliance>
+<Delivery Confirmation, checks in, Customs Clearance>
+<Delivery Confirmation, connectedTo, Cargo Tracking>
+<Delivery Confirmation, connectedTo, Driver Check_in>
+<Delivery Confirmation, connectedTo, Return Logistics>
+<Delivery Confirmation, reports, Vehicle Loading>
+<Driver Check_in, connectedTo, Invoice Matching>
+<Driver Check_in, partOf, Driver Check_in>
+<Fleet Maintenance Scheduling, connectedTo, Container Loading>
+<Fleet Maintenance Scheduling, partOf, Fleet Maintenance Scheduling>
+<Freight Booking, connectedTo, Fleet Maintenance Scheduling>
+<Freight Booking, partOf, Freight Booking>
+<Global Trade Compliance, delivers, Route Optimization Software>
+<Hub Transfer, connectedTo, Route Assignment>
+<Hub Transfer, partOf, Hub Transfer>
+<Invoice Matching, connectedTo, Freight Booking>
+<Invoice Matching, partOf, Invoice Matching>
+<Last_mile Dispatch, connectedTo, Customs Clearance>
+<Last_mile Dispatch, connectedTo, Packing Process>
+<Return Logistics, connectedTo, Vehicle Loading>
+<Route Assignment, connectedTo, Air Cargo Handling>
+<Route Assignment, optimizes, Return Logistics>
+<Route Optimization Software, connectedTo, Route Assignment>
+<Vehicle Loading, connectedTo, Cargo Tracking>
+<Yard Management, insures, Hub Transfer>
+<Yard Management, partOf, Yard Management>
diff --git a/test/graphviz/graph_hard/graphviz_250.dot b/test/graphviz/graph_hard/graphviz_250.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b6c190aa14e2ad31ff4410c59564c89b97a9bedb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_250.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=RL
+	N0 [label="Weight Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N1 [label="Dietary Assessment" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N2 [label="Recipe Adaptation" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N3 [label="Micronutrient Analysis" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N4 [label="Metabolism Rate Assessment" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N5 [label="Meal Planning" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N6 [label="Grocery Shopping Guidance" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N7 [label="Nutrigenomics Research" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N8 [label="Child Nutrition" color="#A2D0FF" fillcolor="#E8F0FF" shape=diamond style=filled]
+	N9 [label="Food Safety Education" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N10 [label="Public Health Nutrition Programs" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N11 [label="Sports Nutrition" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N12 [label="Inflammation and Diet" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N13 [label="Nutritional Counseling" color="#A1D7CD" fillcolor="#EDF5F3" shape=oval style=filled]
+	N14 [label="Personalized Nutrition Plans" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N15 [label="Eating Habit Modification" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	N16 [label="Gut Microbiome Health" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N17 [label="Elderly Nutrition" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N18 [label="Food Allergy Management" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N19 [label="Sustainable Food Systems" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	S0 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Community Nutrition Workshops" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Macronutrient Tracking" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+		nest0_1 [label="Hydration Planning" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+		nest0_2 [label="Disease_Specific Nutrition" color="#DCE775" fillcolor="#F9FBE7" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Nutritional Biomarker Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Food Preparation Guidance" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+		nest1_1 [label="Food Service Management Consulting" color="#A2D0FF" fillcolor="#E8F0FF" shape=oval style=filled]
+		nest1_2 [label="Detoxification Programs" color="#A2D0FF" fillcolor="#E8F0FF" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [label=monitors color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=develops color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=sources color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [label=regulates color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N18 -> N19 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> nest0_0 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N10 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest1_0 [label=filters color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N13 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N8 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N19 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [label=researches color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> M1 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M1 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	M1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_251.dot b/test/graphviz/graph_hard/graphviz_251.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3c234fc2778b2ca3d4cd554a5a600990076ddc0e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_251.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=TD
+	N0 [label="Grocery Shopping Guidance" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N1 [label="Disease_Specific Nutrition" color="#DCE775" fillcolor="#F9FBE7" shape=plaintext style=filled]
+	N2 [label="Hydration Planning" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N3 [label="Food Service Management Consulting" color="#DCE775" fillcolor="#F9FBE7" shape=diamond style=filled]
+	N4 [label="Dietary Assessment" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N5 [label="Agricultural Nutrition Impact" color="#7E57C2" fillcolor="#D1C4E9" shape=oval style=filled]
+	N6 [label="Food Allergy Management" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N7 [label="Weight Management" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N8 [label="Dietary Software Usage" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N9 [label="Supplement Recommendation" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N10 [label="Sustainable Food Systems" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N11 [label="Nutritional Biomarker Analysis" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	S0 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Dietary Supplement Review" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Restaurant Menu Analysis" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_1 [label="Clinical Nutrition Support" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Metabolism Rate Assessment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Food Waste Reduction" color="#03A9F4" fillcolor="#B3E5FC" shape=diamond style=filled]
+		nest1_1 [label="Community Nutrition Workshops" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+		nest1_2 [label="Detoxification Programs" color="#DCE775" fillcolor="#F9FBE7" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=calculates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N5 -> M2 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M2 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	M2 -> N10 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_251.txt b/test/graphviz/graph_hard/graphviz_251.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ac35c04283e48af1731329cc8a2cd141ef3cac48
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_251.txt
@@ -0,0 +1,35 @@
+<Agricultural Nutrition Impact, connectedTo, Food Allergy Management>
+<Agricultural Nutrition Impact, connectedTo, Sustainable Food Systems>
+<Clinical Nutrition Support, connectedTo, Weight Management>
+<Clinical Nutrition Support, partOf, Clinical Nutrition Support>
+<Community Nutrition Workshops, connectedTo, Detoxification Programs>
+<Community Nutrition Workshops, partOf, Community Nutrition Workshops>
+<Detoxification Programs, connectedTo, Food Service Management Consulting>
+<Detoxification Programs, partOf, Detoxification Programs>
+<Dietary Assessment, connectedTo, Agricultural Nutrition Impact>
+<Dietary Software Usage, connectedTo, Supplement Recommendation>
+<Disease_Specific Nutrition, connectedTo, Dietary Assessment>
+<Disease_Specific Nutrition, connectedTo, Dietary Software Usage>
+<Disease_Specific Nutrition, connectedTo, Food Allergy Management>
+<Disease_Specific Nutrition, connectedTo, Hydration Planning>
+<Disease_Specific Nutrition, connectedTo, Weight Management>
+<Food Allergy Management, calculates, Weight Management>
+<Food Allergy Management, connectedTo, Sustainable Food Systems>
+<Food Service Management Consulting, connectedTo, Dietary Assessment>
+<Food Service Management Consulting, connectedTo, Food Waste Reduction>
+<Food Service Management Consulting, connectedTo, Sustainable Food Systems>
+<Food Waste Reduction, connectedTo, Community Nutrition Workshops>
+<Food Waste Reduction, partOf, Food Waste Reduction>
+<Grocery Shopping Guidance, connectedTo, Dietary Assessment>
+<Grocery Shopping Guidance, connectedTo, Disease_Specific Nutrition>
+<Grocery Shopping Guidance, connectedTo, Food Allergy Management>
+<Grocery Shopping Guidance, connectedTo, Food Service Management Consulting>
+<Grocery Shopping Guidance, connectedTo, Weight Management>
+<Hydration Planning, connectedTo, Dietary Assessment>
+<Hydration Planning, connectedTo, Food Service Management Consulting>
+<Restaurant Menu Analysis, connectedTo, Clinical Nutrition Support>
+<Restaurant Menu Analysis, partOf, Restaurant Menu Analysis>
+<Supplement Recommendation, connectedTo, Sustainable Food Systems>
+<Sustainable Food Systems, connectedTo, Nutritional Biomarker Analysis>
+<Sustainable Food Systems, connectedTo, Restaurant Menu Analysis>
+<Weight Management, connectedTo, Dietary Software Usage>
diff --git a/test/graphviz/graph_hard/graphviz_253.dot b/test/graphviz/graph_hard/graphviz_253.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0a6f7ccbaf4ba2bf15afa485baddd781b7c891f7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_253.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=LR
+	N0 [label="Hydration for Exercise" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N1 [label="Personal Training" color="#FFC2C2" fillcolor="#FFEBEB" shape=plaintext style=filled]
+	N2 [label=Cross_Training color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N3 [label="Yoga Instruction" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N4 [label="Mind_Body Connection" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N5 [label="Weightlifting Techniques" color="#795548" fillcolor="#D7CCC8" shape=octagon style=filled]
+	N6 [label="Outdoor Fitness Activities" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N7 [label="Sports_Specific Training" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N8 [label="Balance and Coordination" color="#FFC2C2" fillcolor="#FFEBEB" shape=oval style=filled]
+	N9 [label="Cardiovascular Training" color="#795548" fillcolor="#D7CCC8" shape=folder style=filled]
+	N10 [label="Injury Prevention" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N11 [label="Virtual Fitness Classes" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N12 [label="Youth Fitness Programs" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N13 [label="Pilates Instruction" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N14 [label="Flexibility Training" color="#FFC2C2" fillcolor="#FFEBEB" shape=plaintext style=filled]
+	N15 [label="Community Fitness Challenges" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N16 [label="Core Strengthening" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	S0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Motivation and Goal Setting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Wearable Fitness Devices" color="#FFF9AE" fillcolor="#FFFCE6" shape=oval style=filled]
+		nest0_1 [label="Recovery Strategies" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest0_2 [label="Fitness Equipment Maintenance" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=prevents color="#795548" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Workout Tracking Apps" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Workout Planning" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+		nest1_1 [label="Senior Fitness Programs" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+		nest1_2 [label="Running Coaching" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label=rehabilitates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [label=guides color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [label=consults color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N13 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N15 [label=automates color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [label=develops color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N15 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [label=motivates color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N10 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_253.txt b/test/graphviz/graph_hard/graphviz_253.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b9070541feb4c7aced4ea63bdccb8372d3e2c1c8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_253.txt
@@ -0,0 +1,44 @@
+<Balance and Coordination, connectedTo, Cardiovascular Training>
+<Balance and Coordination, connectedTo, Injury Prevention>
+<Cardiovascular Training, connectedTo, Injury Prevention>
+<Community Fitness Challenges, consults, Core Strengthening>
+<Cross_Training, connectedTo, Injury Prevention>
+<Cross_Training, connectedTo, Wearable Fitness Devices>
+<Cross_Training, connectedTo, Yoga Instruction>
+<Fitness Equipment Maintenance, connectedTo, Pilates Instruction>
+<Fitness Equipment Maintenance, partOf, Fitness Equipment Maintenance>
+<Flexibility Training, connectedTo, Community Fitness Challenges>
+<Hydration for Exercise, connectedTo, Injury Prevention>
+<Hydration for Exercise, connectedTo, Personal Training>
+<Injury Prevention, connectedTo, Virtual Fitness Classes>
+<Injury Prevention, connectedTo, Workout Planning>
+<Mind_Body Connection, connectedTo, Weightlifting Techniques>
+<Outdoor Fitness Activities, connectedTo, Sports_Specific Training>
+<Personal Training, connectedTo, Cross_Training>
+<Pilates Instruction, guides, Flexibility Training>
+<Recovery Strategies, partOf, Recovery Strategies>
+<Recovery Strategies, prevents, Fitness Equipment Maintenance>
+<Running Coaching, automates, Community Fitness Challenges>
+<Running Coaching, partOf, Running Coaching>
+<Senior Fitness Programs, connectedTo, Running Coaching>
+<Senior Fitness Programs, partOf, Senior Fitness Programs>
+<Sports_Specific Training, connectedTo, Balance and Coordination>
+<Sports_Specific Training, connectedTo, Injury Prevention>
+<Virtual Fitness Classes, rehabilitates, Youth Fitness Programs>
+<Wearable Fitness Devices, connectedTo, Recovery Strategies>
+<Wearable Fitness Devices, partOf, Wearable Fitness Devices>
+<Weightlifting Techniques, connectedTo, Balance and Coordination>
+<Weightlifting Techniques, connectedTo, Community Fitness Challenges>
+<Weightlifting Techniques, connectedTo, Outdoor Fitness Activities>
+<Weightlifting Techniques, develops, Injury Prevention>
+<Weightlifting Techniques, motivates, Injury Prevention>
+<Workout Planning, connectedTo, Senior Fitness Programs>
+<Workout Planning, partOf, Workout Planning>
+<Yoga Instruction, connectedTo, Cardiovascular Training>
+<Yoga Instruction, connectedTo, Community Fitness Challenges>
+<Yoga Instruction, connectedTo, Mind_Body Connection>
+<Yoga Instruction, connectedTo, Sports_Specific Training>
+<Youth Fitness Programs, connectedTo, Community Fitness Challenges>
+<Youth Fitness Programs, connectedTo, Core Strengthening>
+<Youth Fitness Programs, connectedTo, Flexibility Training>
+<Youth Fitness Programs, connectedTo, Pilates Instruction>
diff --git a/test/graphviz/graph_hard/graphviz_254.dot b/test/graphviz/graph_hard/graphviz_254.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4e246e62c3e35b651d4851c69e8bcf0d9dd04d58
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_254.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=RL
+	N0 [label="Youth Fitness Programs" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N1 [label="Wearable Fitness Devices" color="#FFF9AE" fillcolor="#FFFCE6" shape=octagon style=filled]
+	N2 [label="Injury Prevention" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N3 [label="Flexibility Training" color="#00BCD4" fillcolor="#E0F7FA" shape=folder style=filled]
+	N4 [label="Outdoor Fitness Activities" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N5 [label="Fitness Assessment" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N6 [label="Personal Training" color="#FFF9AE" fillcolor="#FFFCE6" shape=parallelogram style=filled]
+	N7 [label="Yoga Instruction" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N8 [label="Posture Correction" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N9 [label="Personalized Exercise Prescriptions" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N10 [label="Hydration for Exercise" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N11 [label="Nutrition for Fitness" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N12 [label="Cardiovascular Training" color="#FFF9AE" fillcolor="#FFFCE6" shape=Mdiamond style=filled]
+	N13 [label="Senior Fitness Programs" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N14 [label="Functional Fitness Training" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Group Fitness Classes" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Biometric Feedback Integration" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+		nest0_1 [label="HIIT Workouts" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Running Coaching" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Sports_Specific Training" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+		nest1_1 [label="Endurance Training" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_2 [label="Workout Tracking Apps" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [label=consults color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=connects color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=prevents color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N12 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N2 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N10 -> S0 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> S1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N12 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [label=designs color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_256.txt b/test/graphviz/graph_hard/graphviz_256.txt
new file mode 100644
index 0000000000000000000000000000000000000000..63ea689e7bf8a2df58aa1694e7195ed92412705d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_256.txt
@@ -0,0 +1,33 @@
+<Alternative Therapies, connectedTo, Emotional Well_being>
+<Alternative Therapies, connectedTo, Journaling for Wellness>
+<Burnout Prevention, connectedTo, Digital Detox>
+<Burnout Prevention, partOf, Burnout Prevention>
+<Community Wellness Programs, connectedTo, Digital Detox>
+<Community Wellness Programs, connectedTo, Gut Health for Wellness>
+<Detox Programs, connectedTo, Mindfulness Practice>
+<Digital Detox, connectedTo, Hydrotherapy>
+<Emotional Well_being, personalizes, Gratitude Practice>
+<Employee Wellness Programs, partOf, Employee Wellness Programs>
+<Employee Wellness Programs, programs, Health Coaching>
+<Gratitude Practice, connectedTo, Community Wellness Programs>
+<Health Coaching, connectedTo, Burnout Prevention>
+<Health Coaching, partOf, Health Coaching>
+<Hydrotherapy, connectedTo, Detox Programs>
+<Hydrotherapy, connectedTo, Employee Wellness Programs>
+<Hydrotherapy, connectedTo, Gut Health for Wellness>
+<Hydrotherapy, connectedTo, Mindfulness Practice>
+<Journaling for Wellness, connectedTo, Emotional Well_being>
+<Journaling for Wellness, connectedTo, Gut Health for Wellness>
+<Longevity Planning, balances, Proactive Health Management>
+<Longevity Planning, partOf, Longevity Planning>
+<Mindfulness Practice, connectedTo, Gut Health for Wellness>
+<Mindfulness Practice, connectedTo, Sleep Optimization>
+<Proactive Health Management, connectedTo, Gut Health for Wellness>
+<Proactive Health Management, partOf, Proactive Health Management>
+<Sleep Optimization, connectedTo, Longevity Planning>
+<Sleep Optimization, partOf, Sleep Optimization>
+<Social Connection Enhancement, assesses, Gut Health for Wellness>
+<Social Connection Enhancement, connectedTo, Alternative Therapies>
+<Social Connection Enhancement, connectedTo, Community Wellness Programs>
+<Social Connection Enhancement, connectedTo, Emotional Well_being>
+<Social Connection Enhancement, connectedTo, Gratitude Practice>
diff --git a/test/graphviz/graph_hard/graphviz_257.dot b/test/graphviz/graph_hard/graphviz_257.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a4f87c895811c519db152f900e727d8305ff3dae
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_257.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=BT
+	N0 [label="Employee Wellness Programs" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Nutrition Guidance" color="#E0E0E0" fillcolor="#EBEBEB" shape=folder style=filled]
+	N2 [label="Gratitude Practice" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N3 [label="Stress Management" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N4 [label="Detox Programs" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N5 [label="Gut Health for Wellness" color="#E0E0E0" fillcolor="#EBEBEB" shape=plaintext style=filled]
+	N6 [label="Environmental Wellness" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N7 [label="Health Coaching" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N8 [label="Behavior Change Support" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N9 [label="Longevity Planning" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N10 [label="Proactive Health Management" color="#E0E0E0" fillcolor="#EBEBEB" shape=folder style=filled]
+	N11 [label="Meditation Coaching" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N12 [label="Positive Psychology Application" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N13 [label="Nature Connection" color="#5C6BC0" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N14 [label="Financial Wellness Planning" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N15 [label="Burnout Prevention" color="#5C6BC0" fillcolor="#E8EAF6" shape=folder style=filled]
+	N16 [label="Breathwork Exercises" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N17 [label="Community Wellness Programs" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	S0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Spiritual Exploration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Physical Activity Planning" color="#5C6BC0" fillcolor="#E8EAF6" shape=plaintext style=filled]
+		nest0_1 [label="Acupuncture Consultation" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest0_2 [label="Personal Growth Planning" color="#E0E0E0" fillcolor="#EBEBEB" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label=Hydrotherapy labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Wellness Retreat Planning" color="#E0E0E0" fillcolor="#EBEBEB" shape=oval style=filled]
+		nest1_1 [label="Emotional Well_being" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+		nest1_2 [label="Massage Therapy" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_3 [label="Holistic Health Assessment" color="#5C6BC0" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=tracks color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=mindfulness color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=balances color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=tests color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [label=protects color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> nest1_0 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N16 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N13 -> S0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [label=researches color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [label=manages color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N12 -> M0 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_257.txt b/test/graphviz/graph_hard/graphviz_257.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ecda1ee73e90e4b6568c1873c0f8f992bf00899c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_257.txt
@@ -0,0 +1,43 @@
+<Acupuncture Consultation, connectedTo, Personal Growth Planning>
+<Acupuncture Consultation, partOf, Acupuncture Consultation>
+<Behavior Change Support, connectedTo, Longevity Planning>
+<Breathwork Exercises, connectedTo, Community Wellness Programs>
+<Burnout Prevention, connectedTo, Breathwork Exercises>
+<Burnout Prevention, connectedTo, Wellness Retreat Planning>
+<Detox Programs, connectedTo, Financial Wellness Planning>
+<Detox Programs, connectedTo, Gut Health for Wellness>
+<Emotional Well_being, partOf, Emotional Well_being>
+<Emotional Well_being, tracks, Massage Therapy>
+<Employee Wellness Programs, connectedTo, Behavior Change Support>
+<Employee Wellness Programs, connectedTo, Burnout Prevention>
+<Employee Wellness Programs, connectedTo, Detox Programs>
+<Employee Wellness Programs, connectedTo, Nature Connection>
+<Employee Wellness Programs, connectedTo, Nutrition Guidance>
+<Environmental Wellness, mindfulness, Health Coaching>
+<Environmental Wellness, researches, Financial Wellness Planning>
+<Financial Wellness Planning, connectedTo, Burnout Prevention>
+<Gratitude Practice, connectedTo, Stress Management>
+<Gut Health for Wellness, connectedTo, Environmental Wellness>
+<Health Coaching, connectedTo, Behavior Change Support>
+<Holistic Health Assessment, connectedTo, Breathwork Exercises>
+<Holistic Health Assessment, partOf, Holistic Health Assessment>
+<Longevity Planning, balances, Proactive Health Management>
+<Longevity Planning, manages, Financial Wellness Planning>
+<Massage Therapy, connectedTo, Holistic Health Assessment>
+<Massage Therapy, partOf, Massage Therapy>
+<Meditation Coaching, connectedTo, Positive Psychology Application>
+<Nature Connection, connectedTo, Breathwork Exercises>
+<Nature Connection, connectedTo, Burnout Prevention>
+<Nature Connection, connectedTo, Financial Wellness Planning>
+<Nutrition Guidance, connectedTo, Gratitude Practice>
+<Personal Growth Planning, connectedTo, Financial Wellness Planning>
+<Personal Growth Planning, partOf, Personal Growth Planning>
+<Physical Activity Planning, connectedTo, Acupuncture Consultation>
+<Physical Activity Planning, partOf, Physical Activity Planning>
+<Positive Psychology Application, connectedTo, Financial Wellness Planning>
+<Positive Psychology Application, protects, Nature Connection>
+<Proactive Health Management, tests, Meditation Coaching>
+<Stress Management, connectedTo, Detox Programs>
+<Stress Management, connectedTo, Physical Activity Planning>
+<Wellness Retreat Planning, connectedTo, Emotional Well_being>
+<Wellness Retreat Planning, partOf, Wellness Retreat Planning>
diff --git a/test/graphviz/graph_hard/graphviz_259.dot b/test/graphviz/graph_hard/graphviz_259.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fc63ed44a215da107e3e7a94f59461e7b5335117
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_259.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=LR
+	N0 [label="Feng Shui Consultation" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N1 [label="Bathroom Design" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N2 [label="Office Space Design" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N3 [label="Wall Treatment Selection" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N4 [label="Custom Furniture Design" color="#4DD0E1" fillcolor="#C9F0F0" shape=folder style=filled]
+	N5 [label="Ergonomics Integration" color="#A188D0" fillcolor="#DACBE3" shape=plaintext style=filled]
+	N6 [label="Hospitality Interior Design" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N7 [label="Construction Documentation" color="#E91E63" fillcolor="#F8BBD0" shape=Mdiamond style=filled]
+	N8 [label="Furniture Selection" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N9 [label="Color Scheme Selection" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N10 [label="Material and Finish Specification" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+	N11 [label="Healthcare Interior Design" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="CAD Drafting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Space Planning" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+		nest0_1 [label="Contractor Coordination" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+		nest0_2 [label="3D Rendering" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+		nest0_3 [label="Post_Occupancy Evaluation" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Acoustic Treatment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Kitchen Design" color="#A188D0" fillcolor="#DACBE3" shape=oval style=filled]
+		nest1_1 [label="Sustainable Design Practices" color="#E91E63" fillcolor="#F8BBD0" shape=parallelogram style=filled]
+		nest1_2 [label="Textile and Fabric Selection" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest1_3 [label="Universal Design Principles" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N11 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_259.txt b/test/graphviz/graph_hard/graphviz_259.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ca361ce288a2c69ef4ff339d3674d0ee9e70bc3c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_259.txt
@@ -0,0 +1,37 @@
+<3D Rendering, connectedTo, Post_Occupancy Evaluation>
+<3D Rendering, partOf, 3D Rendering>
+<Bathroom Design, connectedTo, Color Scheme Selection>
+<Bathroom Design, connectedTo, Construction Documentation>
+<Bathroom Design, connectedTo, Custom Furniture Design>
+<Bathroom Design, connectedTo, Kitchen Design>
+<Bathroom Design, connectedTo, Material and Finish Specification>
+<Bathroom Design, connectedTo, Office Space Design>
+<Color Scheme Selection, connectedTo, Material and Finish Specification>
+<Color Scheme Selection, connectedTo, Space Planning>
+<Construction Documentation, connectedTo, Furniture Selection>
+<Contractor Coordination, connectedTo, 3D Rendering>
+<Contractor Coordination, partOf, Contractor Coordination>
+<Custom Furniture Design, connectedTo, Ergonomics Integration>
+<Ergonomics Integration, connectedTo, Color Scheme Selection>
+<Ergonomics Integration, connectedTo, Hospitality Interior Design>
+<Feng Shui Consultation, connectedTo, Bathroom Design>
+<Furniture Selection, connectedTo, Color Scheme Selection>
+<Hospitality Interior Design, connectedTo, Construction Documentation>
+<Kitchen Design, connectedTo, Sustainable Design Practices>
+<Kitchen Design, partOf, Kitchen Design>
+<Material and Finish Specification, connectedTo, Healthcare Interior Design>
+<Office Space Design, connectedTo, Color Scheme Selection>
+<Office Space Design, connectedTo, Wall Treatment Selection>
+<Post_Occupancy Evaluation, connectedTo, Healthcare Interior Design>
+<Post_Occupancy Evaluation, partOf, Post_Occupancy Evaluation>
+<Space Planning, connectedTo, Contractor Coordination>
+<Space Planning, partOf, Space Planning>
+<Sustainable Design Practices, connectedTo, Textile and Fabric Selection>
+<Sustainable Design Practices, partOf, Sustainable Design Practices>
+<Textile and Fabric Selection, connectedTo, Universal Design Principles>
+<Textile and Fabric Selection, partOf, Textile and Fabric Selection>
+<Universal Design Principles, connectedTo, Construction Documentation>
+<Universal Design Principles, partOf, Universal Design Principles>
+<Wall Treatment Selection, connectedTo, Custom Furniture Design>
+<Wall Treatment Selection, connectedTo, Ergonomics Integration>
+<Wall Treatment Selection, connectedTo, Healthcare Interior Design>
diff --git a/test/graphviz/graph_hard/graphviz_26.dot b/test/graphviz/graph_hard/graphviz_26.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9e887d1683028b18b7f7f9c75b220284a53849a8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_26.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=LR
+	N0 [label="Global Trade Compliance" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N1 [label="Cold Chain Management" color="#BA68C8" fillcolor="#F3E5F5" shape=Mdiamond style=filled]
+	N2 [label="Supply Chain Visibility" color="#61CAC3" fillcolor="#C2E8E6" shape=plaintext style=filled]
+	N3 [label="Freight Booking" color="#BA68C8" fillcolor="#F3E5F5" shape=plaintext style=filled]
+	N4 [label="Driver Check_in" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N5 [label="Route Optimization Software" color="#61CAC3" fillcolor="#C2E8E6" shape=Mdiamond style=filled]
+	N6 [label="Hazardous Material Transport" color="#61CAC3" fillcolor="#C2E8E6" shape=Mdiamond style=filled]
+	N7 [label="Rail Transport Coordination" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N8 [label="Cargo Tracking" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N9 [label="Route Assignment" color="#BA68C8" fillcolor="#F3E5F5" shape=Mdiamond style=filled]
+	N10 [label="Inventory Sync" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	S0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Carrier Selection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Pickup Request" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+		nest0_1 [label=Consolidation color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Order Picking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Sorting Center" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+		nest1_1 [label="Customs Declaration" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+		nest1_2 [label="Delay Notification" color="#61CAC3" fillcolor="#C2E8E6" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N4 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_26.txt b/test/graphviz/graph_hard/graphviz_26.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f962bd697e33aedd42f5680e8e3900e47c0fd2eb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_26.txt
@@ -0,0 +1,34 @@
+<Cargo Tracking, connectedTo, Route Assignment>
+<Cold Chain Management, connectedTo, Driver Check_in>
+<Cold Chain Management, connectedTo, Supply Chain Visibility>
+<Consolidation, connectedTo, Driver Check_in>
+<Consolidation, partOf, Consolidation>
+<Customs Declaration, connectedTo, Delay Notification>
+<Customs Declaration, partOf, Customs Declaration>
+<Delay Notification, connectedTo, Inventory Sync>
+<Delay Notification, partOf, Delay Notification>
+<Driver Check_in, connectedTo, Inventory Sync>
+<Driver Check_in, connectedTo, Route Optimization Software>
+<Freight Booking, connectedTo, Cargo Tracking>
+<Freight Booking, connectedTo, Driver Check_in>
+<Freight Booking, connectedTo, Hazardous Material Transport>
+<Freight Booking, connectedTo, Inventory Sync>
+<Freight Booking, connectedTo, Pickup Request>
+<Freight Booking, connectedTo, Route Assignment>
+<Freight Booking, connectedTo, Route Optimization Software>
+<Global Trade Compliance, connectedTo, Cold Chain Management>
+<Global Trade Compliance, connectedTo, Driver Check_in>
+<Hazardous Material Transport, connectedTo, Rail Transport Coordination>
+<Hazardous Material Transport, connectedTo, Route Assignment>
+<Pickup Request, connectedTo, Consolidation>
+<Pickup Request, partOf, Pickup Request>
+<Rail Transport Coordination, connectedTo, Cargo Tracking>
+<Rail Transport Coordination, connectedTo, Inventory Sync>
+<Route Assignment, connectedTo, Inventory Sync>
+<Route Optimization Software, connectedTo, Hazardous Material Transport>
+<Route Optimization Software, connectedTo, Sorting Center>
+<Sorting Center, connectedTo, Customs Declaration>
+<Sorting Center, partOf, Sorting Center>
+<Supply Chain Visibility, connectedTo, Freight Booking>
+<Supply Chain Visibility, connectedTo, Inventory Sync>
+<Supply Chain Visibility, connectedTo, Route Assignment>
diff --git a/test/graphviz/graph_hard/graphviz_261.txt b/test/graphviz/graph_hard/graphviz_261.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e4d19e7c4645301ca54f3278679cd71aa8ab5747
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_261.txt
@@ -0,0 +1,29 @@
+<3D Rendering, connectedTo, Acoustic Treatment>
+<3D Rendering, connectedTo, Smart Home Technology Integration>
+<Acoustic Treatment, connectedTo, Smart Home Technology Integration>
+<Bathroom Design, connectedTo, Flooring Specification>
+<Bathroom Design, partOf, Bathroom Design>
+<Budget Management, connectedTo, Mood Board Creation>
+<Budget Management, connectedTo, Office Space Design>
+<Building Code Compliance, connectedTo, Acoustic Treatment>
+<Building Code Compliance, connectedTo, Bathroom Design>
+<Building Code Compliance, connectedTo, Commercial Interior Design>
+<Building Code Compliance, connectedTo, Smart Home Technology Integration>
+<Commercial Interior Design, connectedTo, Wall Treatment Selection>
+<Concept Development, connectedTo, Acoustic Treatment>
+<Concept Development, connectedTo, Building Code Compliance>
+<Concept Development, connectedTo, Installation Supervision>
+<Concept Development, connectedTo, Office Space Design>
+<Concept Development, connectedTo, Smart Home Technology Integration>
+<Flooring Specification, connectedTo, Wall Treatment Selection>
+<Flooring Specification, partOf, Flooring Specification>
+<Furniture Selection, connectedTo, Post_Occupancy Evaluation>
+<Furniture Selection, partOf, Furniture Selection>
+<Installation Supervision, connectedTo, Budget Management>
+<Mood Board Creation, connectedTo, Furniture Selection>
+<Mood Board Creation, partOf, Mood Board Creation>
+<Office Space Design, connectedTo, Universal Design Principles>
+<Post_Occupancy Evaluation, connectedTo, Budget Management>
+<Post_Occupancy Evaluation, partOf, Post_Occupancy Evaluation>
+<Universal Design Principles, connectedTo, Building Code Compliance>
+<Wall Treatment Selection, connectedTo, 3D Rendering>
diff --git a/test/graphviz/graph_hard/graphviz_263.dot b/test/graphviz/graph_hard/graphviz_263.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e7e82156b72684db5ed7a06e7c0b4f03699b3c70
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_263.dot
@@ -0,0 +1,58 @@
+digraph {
+	rankdir=BT
+	N0 [label="Rule_Based Machine Translation" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N1 [label="Legal Document Translation" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+	N2 [label="Text_to_Speech Synthesis" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N3 [label="Custom Vocabulary Integration" color="#FFF8A6" fillcolor="#FFFDE0" shape=octagon style=filled]
+	N4 [label="Statistical Machine Translation" color="#FFF8A6" fillcolor="#FFFDE0" shape=folder style=filled]
+	N5 [label="Low_Latency Processing" color="#A2D0FF" fillcolor="#E8F0FF" shape=Mdiamond style=filled]
+	N6 [label="Voice Biometrics" color="#FFF8A6" fillcolor="#FFFDE0" shape=folder style=filled]
+	N7 [label="Real_Time Captioning" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+	N8 [label="Subtitling Generation" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Data Security for Translated Content" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="API Integration for Translation Services" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest0_1 [label="Meeting Translation Systems" color="#A2D0FF" fillcolor="#E8F0FF" shape=diamond style=filled]
+		nest0_2 [label="Language Detection" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+		nest0_3 [label="Tone Recognition" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [label=automates color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=licenses color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Multimodal Translation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Dialect Recognition" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+		nest1_1 [label="Glossary Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+		nest1_2 [label="Social Media Translation" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [label=optimizes color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [label=integrates color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_264.dot b/test/graphviz/graph_hard/graphviz_264.dot
new file mode 100644
index 0000000000000000000000000000000000000000..85718037f7765d339265050928b6ddc98d958556
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_264.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=LR
+	N0 [label="Speech Recognition" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N1 [label="Real_Time Document Translation" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N2 [label="Accent Adaptation" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+	N3 [label="API Integration for Translation Services" color="#9FA9E1" fillcolor="#D6D9F0" shape=oval style=filled]
+	N4 [label="Statistical Machine Translation" color="#61CAC3" fillcolor="#C2E8E6" shape=folder style=filled]
+	N5 [label="Machine Translation Engine" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+	N6 [label="Noise Reduction for Speech Input" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+	N7 [label="Pronunciation Correction" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N8 [label="Dialect Recognition" color="#B0C5CD" fillcolor="#DFE7EB" shape=octagon style=filled]
+	N9 [label="Speaker Diarization" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N10 [label="Low_Latency Processing" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N11 [label="Sentiment Analysis in Translation" color="#61CAC3" fillcolor="#C2E8E6" shape=plaintext style=filled]
+	N12 [label="Customer Support Translation" color="#9FA9E1" fillcolor="#D6D9F0" shape=oval style=filled]
+	N13 [label="Tone Recognition" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N14 [label="Voice Biometrics" color="#9FA9E1" fillcolor="#D6D9F0" shape=Mdiamond style=filled]
+	N15 [label="Emotion Detection in Speech" color="#B0C5CD" fillcolor="#DFE7EB" shape=plaintext style=filled]
+	N16 [label="Rule_Based Machine Translation" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	S0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Multimodal Translation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Legal Document Translation" color="#B0C5CD" fillcolor="#DFE7EB" shape=Mdiamond style=filled]
+		nest0_1 [label="Subtitling Generation" color="#9FA9E1" fillcolor="#D6D9F0" shape=oval style=filled]
+		nest0_2 [label="Domain_Specific Translation Models" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=tracks color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Cross_Lingual Communication" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Text_to_Speech Synthesis" color="#9FA9E1" fillcolor="#D6D9F0" shape=oval style=filled]
+		nest1_1 [label="Language Detection" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+		nest1_2 [label="Meeting Translation Systems" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=captures color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N12 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N15 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [label=converts color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=adapts color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_265.dot b/test/graphviz/graph_hard/graphviz_265.dot
new file mode 100644
index 0000000000000000000000000000000000000000..38ecf44dd9c0f0a6fdd60061a0df917e7feee9a1
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_265.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=TD
+	N0 [label="Wildlife Tracking" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N1 [label="Communication Systems" color="#A1887F" fillcolor="#EFEBE9" shape=folder style=filled]
+	N2 [label="3D Modeling from Drone Data" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N3 [label="Flight Planning Software" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N4 [label="Drone Maintenance" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N5 [label="Battery Management System" color="#A1887F" fillcolor="#EFEBE9" shape=plaintext style=filled]
+	N6 [label="Drone Regulations Compliance" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N7 [label="Drone Delivery Logistics" color="#BCB88A" fillcolor="#F5F5DC" shape=parallelogram style=filled]
+	N8 [label="Aerial Photography" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Drone Data Security" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Ethical Drone Use" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+		nest0_1 [label="Ground Control Station Development" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest0_2 [label="Autonomous Flight" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Thermal Imaging with Drones" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Counter_Drone Systems" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+		nest1_1 [label="Geofencing Implementation" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+		nest1_2 [label="Sensor Integration" color="#BCB88A" fillcolor="#F5F5DC" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N3 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N3 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [label=secures color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> S1 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	S1 -> N2 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_266.dot b/test/graphviz/graph_hard/graphviz_266.dot
new file mode 100644
index 0000000000000000000000000000000000000000..154f96c9fe423b292f7241b78065fb0b18955c39
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_266.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Aerial Photography" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N1 [label="Swarm Robotics for Drones" color="#FFF8A6" fillcolor="#FFFDE0" shape=diamond style=filled]
+	N2 [label="Flight Control System" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N3 [label="Counter_Drone Systems" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N4 [label="Security Surveillance" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N5 [label="Airspace Management for Drones" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N6 [label="Propeller Design" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N7 [label="Drone Design" color="#B8C0F5" fillcolor="#ECF0FD" shape=oval style=filled]
+	N8 [label="Flight Planning Software" color="#AED581" fillcolor="#F0F4C3" shape=plaintext style=filled]
+	N9 [label="Delivery Services" color="#B8C0F5" fillcolor="#ECF0FD" shape=Mdiamond style=filled]
+	N10 [label="Wildlife Tracking" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+	N11 [label="Endurance Optimization" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N12 [label="Geofencing Implementation" color="#FFF8A6" fillcolor="#FFFDE0" shape=octagon style=filled]
+	N13 [label="Data Processing from Drones" color="#AED581" fillcolor="#F0F4C3" shape=folder style=filled]
+	N14 [label="Ethical Drone Use" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Sensor Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Urban Air Mobility Planning" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+		nest0_1 [label="Autonomous Flight" color="#FFF8A6" fillcolor="#FFFDE0" shape=octagon style=filled]
+		nest0_2 [label=Inspection color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest0_3 [label="Environmental Monitoring" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="AI for Drone Autonomy" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Search and Rescue Operations" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+		nest1_1 [label="3D Modeling from Drone Data" color="#B8C0F5" fillcolor="#ECF0FD" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [label=gathers color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=identifies color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=processes color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [label=visualizes color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N10 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N6 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N10 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [label=receives color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	M2 -> N11 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_266.txt b/test/graphviz/graph_hard/graphviz_266.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4726cfbfd1ba97724b18c88d06e2410b0d8bf078
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_266.txt
@@ -0,0 +1,41 @@
+<3D Modeling from Drone Data, connectedTo, Propeller Design>
+<3D Modeling from Drone Data, partOf, 3D Modeling from Drone Data>
+<Aerial Photography, connectedTo, Swarm Robotics for Drones>
+<Airspace Management for Drones, identifies, Propeller Design>
+<Autonomous Flight, connectedTo, Inspection>
+<Autonomous Flight, partOf, Autonomous Flight>
+<Counter_Drone Systems, connectedTo, Airspace Management for Drones>
+<Counter_Drone Systems, connectedTo, Security Surveillance>
+<Data Processing from Drones, connectedTo, Ethical Drone Use>
+<Delivery Services, connectedTo, Data Processing from Drones>
+<Delivery Services, connectedTo, Endurance Optimization>
+<Delivery Services, connectedTo, Ethical Drone Use>
+<Delivery Services, connectedTo, Geofencing Implementation>
+<Delivery Services, connectedTo, Wildlife Tracking>
+<Drone Design, connectedTo, Flight Planning Software>
+<Endurance Optimization, connectedTo, Geofencing Implementation>
+<Environmental Monitoring, connectedTo, Wildlife Tracking>
+<Environmental Monitoring, partOf, Environmental Monitoring>
+<Flight Control System, connectedTo, Airspace Management for Drones>
+<Flight Control System, connectedTo, Counter_Drone Systems>
+<Flight Control System, connectedTo, Wildlife Tracking>
+<Flight Control System, receives, Endurance Optimization>
+<Flight Planning Software, connectedTo, Delivery Services>
+<Flight Planning Software, connectedTo, Search and Rescue Operations>
+<Flight Planning Software, connectedTo, Wildlife Tracking>
+<Geofencing Implementation, connectedTo, Data Processing from Drones>
+<Inspection, connectedTo, Environmental Monitoring>
+<Inspection, partOf, Inspection>
+<Propeller Design, connectedTo, Drone Design>
+<Propeller Design, connectedTo, Wildlife Tracking>
+<Search and Rescue Operations, gathers, 3D Modeling from Drone Data>
+<Search and Rescue Operations, partOf, Search and Rescue Operations>
+<Security Surveillance, connectedTo, Airspace Management for Drones>
+<Swarm Robotics for Drones, connectedTo, Airspace Management for Drones>
+<Swarm Robotics for Drones, connectedTo, Endurance Optimization>
+<Swarm Robotics for Drones, connectedTo, Flight Control System>
+<Swarm Robotics for Drones, connectedTo, Wildlife Tracking>
+<Swarm Robotics for Drones, visualizes, Urban Air Mobility Planning>
+<Urban Air Mobility Planning, connectedTo, Autonomous Flight>
+<Urban Air Mobility Planning, partOf, Urban Air Mobility Planning>
+<Wildlife Tracking, processes, Endurance Optimization>
diff --git a/test/graphviz/graph_hard/graphviz_267.dot b/test/graphviz/graph_hard/graphviz_267.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ccff9afb8a67d32f492582de7d3c1c537e27d09a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_267.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=TD
+	N0 [label="Battery Management System" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N1 [label="Security Surveillance" color="#26A69A" fillcolor="#E0F2F1" shape=diamond style=filled]
+	N2 [label="Search and Rescue Operations" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N3 [label="Propeller Design" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N4 [label="AI for Drone Autonomy" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N5 [label="Wildlife Tracking" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N6 [label="Thermal Imaging with Drones" color="#A188D0" fillcolor="#DACBE3" shape=folder style=filled]
+	N7 [label="Environmental Monitoring" color="#A188D0" fillcolor="#DACBE3" shape=oval style=filled]
+	N8 [label="3D Modeling from Drone Data" color="#6FE1D5" fillcolor="#C9EFEC" shape=Mdiamond style=filled]
+	N9 [label="Precision Agriculture" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N10 [label="Collision Avoidance Systems" color="#6FE1D5" fillcolor="#C9EFEC" shape=parallelogram style=filled]
+	N11 [label="Drone Design" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N12 [label="Drone Data Security" color="#6FE1D5" fillcolor="#C9EFEC" shape=octagon style=filled]
+	N13 [label="Propulsion System Development" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N14 [label="Counter_Drone Systems" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+	N15 [label="Payload Customization" color="#A188D0" fillcolor="#DACBE3" shape=parallelogram style=filled]
+	N16 [label="Sensor Integration" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N17 [label=Inspection color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	S0 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Ethical Drone Use" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Drone Delivery Logistics" color="#26A69A" fillcolor="#E0F2F1" shape=diamond style=filled]
+		nest0_1 [label="Navigation System" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [label=permits color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Delivery Services" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Flight Planning Software" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_1 [label="Mapping and Surveying" color="#6FE1D5" fillcolor="#C9EFEC" shape=plaintext style=filled]
+		nest1_2 [label="Endurance Optimization" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_3 [label="Swarm Robotics for Drones" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> nest0_0 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N7 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [label=monitors color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N5 -> S2 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N16 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_267.txt b/test/graphviz/graph_hard/graphviz_267.txt
new file mode 100644
index 0000000000000000000000000000000000000000..46392110e97233540acd1a2878159ee3e874a799
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_267.txt
@@ -0,0 +1,41 @@
+<3D Modeling from Drone Data, connectedTo, Drone Design>
+<3D Modeling from Drone Data, connectedTo, Precision Agriculture>
+<3D Modeling from Drone Data, connectedTo, Sensor Integration>
+<AI for Drone Autonomy, connectedTo, Wildlife Tracking>
+<Battery Management System, connectedTo, Security Surveillance>
+<Collision Avoidance Systems, connectedTo, Drone Design>
+<Counter_Drone Systems, connectedTo, Payload Customization>
+<Drone Data Security, connectedTo, Propulsion System Development>
+<Drone Delivery Logistics, partOf, Drone Delivery Logistics>
+<Drone Delivery Logistics, permits, Navigation System>
+<Drone Design, connectedTo, Drone Data Security>
+<Drone Design, connectedTo, Inspection>
+<Drone Design, monitors, Propulsion System Development>
+<Endurance Optimization, connectedTo, Swarm Robotics for Drones>
+<Endurance Optimization, partOf, Endurance Optimization>
+<Environmental Monitoring, connectedTo, 3D Modeling from Drone Data>
+<Environmental Monitoring, connectedTo, Flight Planning Software>
+<Flight Planning Software, connectedTo, Mapping and Surveying>
+<Flight Planning Software, partOf, Flight Planning Software>
+<Mapping and Surveying, connectedTo, Endurance Optimization>
+<Mapping and Surveying, partOf, Mapping and Surveying>
+<Navigation System, connectedTo, Environmental Monitoring>
+<Navigation System, partOf, Navigation System>
+<Payload Customization, connectedTo, Sensor Integration>
+<Precision Agriculture, connectedTo, Collision Avoidance Systems>
+<Propeller Design, connectedTo, AI for Drone Autonomy>
+<Propeller Design, connectedTo, Precision Agriculture>
+<Propulsion System Development, connectedTo, Counter_Drone Systems>
+<Propulsion System Development, connectedTo, Drone Delivery Logistics>
+<Search and Rescue Operations, connectedTo, Environmental Monitoring>
+<Search and Rescue Operations, connectedTo, Propeller Design>
+<Security Surveillance, connectedTo, Environmental Monitoring>
+<Security Surveillance, connectedTo, Search and Rescue Operations>
+<Sensor Integration, connectedTo, Inspection>
+<Swarm Robotics for Drones, connectedTo, Drone Data Security>
+<Swarm Robotics for Drones, partOf, Swarm Robotics for Drones>
+<Thermal Imaging with Drones, connectedTo, Environmental Monitoring>
+<Thermal Imaging with Drones, connectedTo, Precision Agriculture>
+<Wildlife Tracking, connectedTo, Payload Customization>
+<Wildlife Tracking, connectedTo, Sensor Integration>
+<Wildlife Tracking, connectedTo, Thermal Imaging with Drones>
diff --git a/test/graphviz/graph_hard/graphviz_268.dot b/test/graphviz/graph_hard/graphviz_268.dot
new file mode 100644
index 0000000000000000000000000000000000000000..aa43466e1596a6d5542241316dd33b26fec14222
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_268.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=TD
+	N0 [label="Human_Machine Interface" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N1 [label="Accident Reconstruction for AVs" color="#AABEC6" fillcolor="#E0E6E9" shape=folder style=filled]
+	N2 [label="Cloud Connectivity for AVs" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N3 [label="Vehicle_to_Infrastructure Communication" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N4 [label="Public Acceptance and Trust" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N5 [label="Data Collection and Annotation" color="#D3EB9F" fillcolor="#F8FDD3" shape=diamond style=filled]
+	N6 [label="Fleet Management" color="#AABEC6" fillcolor="#E0E6E9" shape=folder style=filled]
+	N7 [label="Automatic Emergency Braking" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N8 [label="Traffic Sign Recognition" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N9 [label="Simulation Environment Development" color="#AABEC6" fillcolor="#E0E6E9" shape=hexagon style=filled]
+	N10 [label="Pedestrian Detection" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N11 [label="Lane Keeping Assist" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	S0 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Parking Assistance Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Path Planning" color="#D3EB9F" fillcolor="#F8FDD3" shape=folder style=filled]
+		nest0_1 [label="Ethical Decision_Making" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+		nest0_2 [label="Vehicle_to_Vehicle Communication" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Vehicle Diagnostics" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Edge Computing for AVs" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+		nest1_1 [label="Redundancy in Sensors" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+		nest1_2 [label="Remote Operation Capability" color="#AABEC6" fillcolor="#E0E6E9" shape=hexagon style=filled]
+		nest1_3 [label="Motion Control" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=assembles color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=diagnoses color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N4 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N9 [label=alerts color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [label=maintains color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [label=fuels color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_268.txt b/test/graphviz/graph_hard/graphviz_268.txt
new file mode 100644
index 0000000000000000000000000000000000000000..386c045896b1ae1f33458e71733c57b843603f19
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_268.txt
@@ -0,0 +1,36 @@
+<Accident Reconstruction for AVs, connectedTo, Cloud Connectivity for AVs>
+<Accident Reconstruction for AVs, connectedTo, Lane Keeping Assist>
+<Accident Reconstruction for AVs, connectedTo, Pedestrian Detection>
+<Accident Reconstruction for AVs, connectedTo, Public Acceptance and Trust>
+<Automatic Emergency Braking, connectedTo, Traffic Sign Recognition>
+<Cloud Connectivity for AVs, connectedTo, Automatic Emergency Braking>
+<Cloud Connectivity for AVs, connectedTo, Data Collection and Annotation>
+<Cloud Connectivity for AVs, connectedTo, Simulation Environment Development>
+<Cloud Connectivity for AVs, connectedTo, Vehicle_to_Infrastructure Communication>
+<Cloud Connectivity for AVs, fuels, Fleet Management>
+<Data Collection and Annotation, connectedTo, Edge Computing for AVs>
+<Data Collection and Annotation, connectedTo, Fleet Management>
+<Edge Computing for AVs, connectedTo, Redundancy in Sensors>
+<Edge Computing for AVs, partOf, Edge Computing for AVs>
+<Ethical Decision_Making, connectedTo, Vehicle_to_Vehicle Communication>
+<Ethical Decision_Making, partOf, Ethical Decision_Making>
+<Fleet Management, connectedTo, Automatic Emergency Braking>
+<Human_Machine Interface, connectedTo, Accident Reconstruction for AVs>
+<Motion Control, alerts, Simulation Environment Development>
+<Motion Control, partOf, Motion Control>
+<Path Planning, connectedTo, Ethical Decision_Making>
+<Path Planning, partOf, Path Planning>
+<Pedestrian Detection, diagnoses, Lane Keeping Assist>
+<Public Acceptance and Trust, connectedTo, Data Collection and Annotation>
+<Redundancy in Sensors, connectedTo, Remote Operation Capability>
+<Redundancy in Sensors, partOf, Redundancy in Sensors>
+<Remote Operation Capability, connectedTo, Motion Control>
+<Remote Operation Capability, partOf, Remote Operation Capability>
+<Simulation Environment Development, connectedTo, Path Planning>
+<Simulation Environment Development, connectedTo, Pedestrian Detection>
+<Traffic Sign Recognition, assembles, Simulation Environment Development>
+<Vehicle_to_Infrastructure Communication, connectedTo, Automatic Emergency Braking>
+<Vehicle_to_Infrastructure Communication, connectedTo, Public Acceptance and Trust>
+<Vehicle_to_Infrastructure Communication, maintains, Fleet Management>
+<Vehicle_to_Vehicle Communication, connectedTo, Public Acceptance and Trust>
+<Vehicle_to_Vehicle Communication, partOf, Vehicle_to_Vehicle Communication>
diff --git a/test/graphviz/graph_hard/graphviz_271.dot b/test/graphviz/graph_hard/graphviz_271.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6960a3b0e552cd71c0d2e0e892d3e3abc0f70960
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_271.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=BT
+	N0 [label="Sustainability Initiatives" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N1 [label="Customer Support" color="#4FC3F7" fillcolor="#E1F5FE" shape=Mdiamond style=filled]
+	N2 [label="Data Analytics for Usage Patterns" color="#4FC3F7" fillcolor="#E1F5FE" shape=oval style=filled]
+	N3 [label="Geofencing for Operations" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N4 [label="Ticketing and Fare Collection" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N5 [label="Public_Private Partnerships" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N6 [label="User Rating and Feedback Systems" color="#4FC3F7" fillcolor="#E1F5FE" shape=plaintext style=filled]
+	N7 [label="Public Transit Integration" color="#4FC3F7" fillcolor="#E1F5FE" shape=diamond style=filled]
+	N8 [label="Dynamic Pricing" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N9 [label="Smart City Integration" color="#E0E0E0" fillcolor="#EBEBEB" shape=plaintext style=filled]
+	N10 [label="Policy Advocacy for Shared Mobility" color="#E0E0E0" fillcolor="#EBEBEB" shape=Mdiamond style=filled]
+	N11 [label="Vehicle Location Tracking" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N12 [label="Passenger Safety Protocols" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N13 [label="Parking Integration" color="#607D8B" fillcolor="#CFD8DC" shape=diamond style=filled]
+	N14 [label="First_Mile or Last_Mile Solutions" color="#4FC3F7" fillcolor="#E1F5FE" shape=Mdiamond style=filled]
+	N15 [label="Route Optimization" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N16 [label="Scooter_sharing Services" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N17 [label="Autonomous Shared Vehicles" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N18 [label="Platform Development" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	S0 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="User Registration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Ride_sharing Services" color="#E0E0E0" fillcolor="#EBEBEB" shape=folder style=filled]
+		nest0_1 [label="User Onboarding" color="#607D8B" fillcolor="#CFD8DC" shape=diamond style=filled]
+		nest0_2 [label="Fleet Management" color="#607D8B" fillcolor="#CFD8DC" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Driver Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Vehicle Rebalancing" color="#E0E0E0" fillcolor="#EBEBEB" shape=octagon style=filled]
+		nest1_1 [label="Fraud Prevention" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [label=forecasts color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [label=models color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N13 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N1 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	S0 -> N18 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_271.txt b/test/graphviz/graph_hard/graphviz_271.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8eaa94957b24d7b394c049b5ce65a5f5c0f0cae3
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_271.txt
@@ -0,0 +1,38 @@
+<Autonomous Shared Vehicles, models, Platform Development>
+<Customer Support, connectedTo, Data Analytics for Usage Patterns>
+<Customer Support, connectedTo, Public Transit Integration>
+<Customer Support, connectedTo, Ride_sharing Services>
+<Data Analytics for Usage Patterns, connectedTo, Geofencing for Operations>
+<Data Analytics for Usage Patterns, connectedTo, Public Transit Integration>
+<Dynamic Pricing, connectedTo, Passenger Safety Protocols>
+<Dynamic Pricing, connectedTo, Platform Development>
+<Dynamic Pricing, connectedTo, Policy Advocacy for Shared Mobility>
+<Dynamic Pricing, connectedTo, Smart City Integration>
+<First_Mile or Last_Mile Solutions, forecasts, Route Optimization>
+<Fleet Management, connectedTo, Parking Integration>
+<Fleet Management, partOf, Fleet Management>
+<Fraud Prevention, connectedTo, Customer Support>
+<Fraud Prevention, partOf, Fraud Prevention>
+<Geofencing for Operations, connectedTo, Ticketing and Fare Collection>
+<Parking Integration, connectedTo, First_Mile or Last_Mile Solutions>
+<Passenger Safety Protocols, connectedTo, Parking Integration>
+<Policy Advocacy for Shared Mobility, connectedTo, Vehicle Location Tracking>
+<Policy Advocacy for Shared Mobility, connectedTo, Vehicle Rebalancing>
+<Public Transit Integration, connectedTo, Dynamic Pricing>
+<Public_Private Partnerships, connectedTo, Platform Development>
+<Public_Private Partnerships, connectedTo, User Rating and Feedback Systems>
+<Public_Private Partnerships, connectedTo, Vehicle Location Tracking>
+<Ride_sharing Services, connectedTo, User Onboarding>
+<Ride_sharing Services, partOf, Ride_sharing Services>
+<Route Optimization, connectedTo, Scooter_sharing Services>
+<Scooter_sharing Services, connectedTo, Autonomous Shared Vehicles>
+<Smart City Integration, connectedTo, Policy Advocacy for Shared Mobility>
+<Sustainability Initiatives, connectedTo, Customer Support>
+<Sustainability Initiatives, connectedTo, Public Transit Integration>
+<Ticketing and Fare Collection, connectedTo, Public_Private Partnerships>
+<User Onboarding, connectedTo, Fleet Management>
+<User Onboarding, partOf, User Onboarding>
+<User Rating and Feedback Systems, connectedTo, Public Transit Integration>
+<Vehicle Location Tracking, connectedTo, Passenger Safety Protocols>
+<Vehicle Rebalancing, connectedTo, Fraud Prevention>
+<Vehicle Rebalancing, partOf, Vehicle Rebalancing>
diff --git a/test/graphviz/graph_hard/graphviz_272.dot b/test/graphviz/graph_hard/graphviz_272.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4fd4bc9d92f3faaf8f22588cdca6a39042bdf3bd
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_272.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=TD
+	N0 [label="Route Optimization" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N1 [label="Micro_mobility Management" color="#4285F4" fillcolor="#D0E0F8" shape=parallelogram style=filled]
+	N2 [label="Maintenance Scheduling" color="#A188D0" fillcolor="#DACBE3" shape=octagon style=filled]
+	N3 [label="Car_sharing Services" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N4 [label="Subscription Model Management" color="#6EB76D" fillcolor="#E9F7E8" shape=folder style=filled]
+	N5 [label="First_Mile or Last_Mile Solutions" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+	N6 [label="Scooter_sharing Services" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N7 [label="Demand Prediction" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N8 [label="Accessibility for Users" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+	N9 [label="Charging or Refueling Logistics" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N10 [label="Vehicle Location Tracking" color="#4285F4" fillcolor="#D0E0F8" shape=parallelogram style=filled]
+	N11 [label="User Rating and Feedback Systems" color="#6EB76D" fillcolor="#E9F7E8" shape=Mdiamond style=filled]
+	N12 [label="Vehicle Rebalancing" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N13 [label="User Onboarding" color="#6EB76D" fillcolor="#E9F7E8" shape=Mdiamond style=filled]
+	N14 [label="Geofencing for Operations" color="#A188D0" fillcolor="#DACBE3" shape=folder style=filled]
+	N15 [label="Vehicle Booking" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	S1 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#6EB76D" fillcolor="#E9F7E8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Carbon Emission Tracking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Fleet Management" color="#6EB76D" fillcolor="#E9F7E8" shape=plaintext style=filled]
+		nest0_1 [label="Parking Integration" color="#4285F4" fillcolor="#D0E0F8" shape=Mdiamond style=filled]
+		nest0_2 [label="Ticketing and Fare Collection" color="#6EB76D" fillcolor="#E9F7E8" shape=hexagon style=filled]
+		nest0_3 [label="Autonomous Shared Vehicles" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=parks color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Policy Advocacy for Shared Mobility" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Supply_Demand Balancing" color="#A188D0" fillcolor="#DACBE3" shape=Mdiamond style=filled]
+		nest1_1 [label="Passenger Safety Protocols" color="#4285F4" fillcolor="#D0E0F8" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=complies color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=licenses color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=dispatches color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N13 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N9 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N9 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [label=partners color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S2 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=secures color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_272.txt b/test/graphviz/graph_hard/graphviz_272.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4b8700d0a9d2e759a37787d3dd00d3daff61a5dd
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_272.txt
@@ -0,0 +1,38 @@
+<Accessibility for Users, connectedTo, Charging or Refueling Logistics>
+<Accessibility for Users, connectedTo, User Onboarding>
+<Accessibility for Users, connectedTo, Vehicle Location Tracking>
+<Autonomous Shared Vehicles, connectedTo, Charging or Refueling Logistics>
+<Autonomous Shared Vehicles, partOf, Autonomous Shared Vehicles>
+<Car_sharing Services, licenses, Subscription Model Management>
+<Charging or Refueling Logistics, connectedTo, Vehicle Location Tracking>
+<Demand Prediction, connectedTo, Accessibility for Users>
+<First_Mile or Last_Mile Solutions, connectedTo, Scooter_sharing Services>
+<First_Mile or Last_Mile Solutions, connectedTo, Vehicle Rebalancing>
+<First_Mile or Last_Mile Solutions, partners, Vehicle Location Tracking>
+<Fleet Management, connectedTo, Parking Integration>
+<Fleet Management, partOf, Fleet Management>
+<Geofencing for Operations, connectedTo, Vehicle Booking>
+<Maintenance Scheduling, connectedTo, Car_sharing Services>
+<Maintenance Scheduling, connectedTo, Scooter_sharing Services>
+<Micro_mobility Management, connectedTo, Car_sharing Services>
+<Micro_mobility Management, connectedTo, Maintenance Scheduling>
+<Micro_mobility Management, connectedTo, Scooter_sharing Services>
+<Micro_mobility Management, connectedTo, Supply_Demand Balancing>
+<Parking Integration, parks, Ticketing and Fare Collection>
+<Parking Integration, partOf, Parking Integration>
+<Passenger Safety Protocols, connectedTo, Charging or Refueling Logistics>
+<Passenger Safety Protocols, partOf, Passenger Safety Protocols>
+<Route Optimization, complies, Micro_mobility Management>
+<Route Optimization, connectedTo, Car_sharing Services>
+<Route Optimization, secures, Scooter_sharing Services>
+<Scooter_sharing Services, connectedTo, Demand Prediction>
+<Subscription Model Management, connectedTo, First_Mile or Last_Mile Solutions>
+<Supply_Demand Balancing, connectedTo, Passenger Safety Protocols>
+<Supply_Demand Balancing, partOf, Supply_Demand Balancing>
+<Ticketing and Fare Collection, connectedTo, Autonomous Shared Vehicles>
+<Ticketing and Fare Collection, partOf, Ticketing and Fare Collection>
+<User Onboarding, connectedTo, Fleet Management>
+<User Onboarding, connectedTo, Geofencing for Operations>
+<User Rating and Feedback Systems, connectedTo, Vehicle Rebalancing>
+<Vehicle Location Tracking, dispatches, User Rating and Feedback Systems>
+<Vehicle Rebalancing, connectedTo, User Onboarding>
diff --git a/test/graphviz/graph_hard/graphviz_273.dot b/test/graphviz/graph_hard/graphviz_273.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a556b0cee359950344f755d89c280924d297659a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_273.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=BT
+	N0 [label="Charging or Refueling Logistics" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N1 [label="Customer Support" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N2 [label="Ticketing and Fare Collection" color="#FF8A65" fillcolor="#FBE9E7" shape=folder style=filled]
+	N3 [label="User Rating and Feedback Systems" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+	N4 [label="Parking Integration" color="#8C9EFF" fillcolor="#D3D7EB" shape=oval style=filled]
+	N5 [label="Passenger Safety Protocols" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N6 [label="Vehicle Rebalancing" color="#8C9EFF" fillcolor="#D3D7EB" shape=folder style=filled]
+	N7 [label="Car_sharing Services" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N8 [label="User Onboarding" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N9 [label="Scooter_sharing Services" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N10 [label="Driver Management" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N11 [label="User Registration" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N12 [label="Ride_sharing Services" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N13 [label="Insurance Models" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N14 [label="Maintenance Scheduling" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N15 [label="Vehicle Location Tracking" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N16 [label="Supply_Demand Balancing" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	S0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Bike_sharing Services" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Carbon Emission Tracking" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest0_1 [label="Fleet Management" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Regulatory Compliance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Platform Development" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+		nest1_1 [label="Route Optimization" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+		nest1_2 [label="Smart City Integration" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> nest0_0 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N15 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N11 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_273.txt b/test/graphviz/graph_hard/graphviz_273.txt
new file mode 100644
index 0000000000000000000000000000000000000000..68b45ec8cfeb443f1e6eb7eb7d0245ac42eb4301
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_273.txt
@@ -0,0 +1,41 @@
+<Car_sharing Services, connectedTo, Platform Development>
+<Car_sharing Services, connectedTo, User Onboarding>
+<Carbon Emission Tracking, connectedTo, Fleet Management>
+<Carbon Emission Tracking, partOf, Carbon Emission Tracking>
+<Charging or Refueling Logistics, connectedTo, Car_sharing Services>
+<Charging or Refueling Logistics, connectedTo, Customer Support>
+<Customer Support, connectedTo, Ticketing and Fare Collection>
+<Customer Support, connectedTo, User Registration>
+<Driver Management, connectedTo, User Registration>
+<Fleet Management, connectedTo, Vehicle Location Tracking>
+<Fleet Management, partOf, Fleet Management>
+<Insurance Models, connectedTo, Maintenance Scheduling>
+<Maintenance Scheduling, connectedTo, Vehicle Location Tracking>
+<Parking Integration, connectedTo, Passenger Safety Protocols>
+<Passenger Safety Protocols, connectedTo, Car_sharing Services>
+<Passenger Safety Protocols, connectedTo, User Registration>
+<Passenger Safety Protocols, connectedTo, Vehicle Rebalancing>
+<Platform Development, connectedTo, Route Optimization>
+<Platform Development, partOf, Platform Development>
+<Ride_sharing Services, connectedTo, Insurance Models>
+<Ride_sharing Services, connectedTo, Maintenance Scheduling>
+<Ride_sharing Services, connectedTo, Supply_Demand Balancing>
+<Ride_sharing Services, connectedTo, Vehicle Location Tracking>
+<Route Optimization, connectedTo, Smart City Integration>
+<Route Optimization, partOf, Route Optimization>
+<Scooter_sharing Services, connectedTo, Driver Management>
+<Smart City Integration, connectedTo, Vehicle Rebalancing>
+<Smart City Integration, partOf, Smart City Integration>
+<Ticketing and Fare Collection, connectedTo, User Rating and Feedback Systems>
+<Ticketing and Fare Collection, connectedTo, User Registration>
+<User Onboarding, connectedTo, Scooter_sharing Services>
+<User Onboarding, connectedTo, User Registration>
+<User Rating and Feedback Systems, connectedTo, Car_sharing Services>
+<User Rating and Feedback Systems, connectedTo, Driver Management>
+<User Rating and Feedback Systems, connectedTo, Parking Integration>
+<User Rating and Feedback Systems, connectedTo, Passenger Safety Protocols>
+<User Rating and Feedback Systems, connectedTo, Ride_sharing Services>
+<User Registration, connectedTo, Ride_sharing Services>
+<Vehicle Location Tracking, connectedTo, Carbon Emission Tracking>
+<Vehicle Location Tracking, connectedTo, Supply_Demand Balancing>
+<Vehicle Rebalancing, connectedTo, Car_sharing Services>
diff --git a/test/graphviz/graph_hard/graphviz_274.dot b/test/graphviz/graph_hard/graphviz_274.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8d803e37aa4236cd86d8a4f6e5f4e8ffeb4f1085
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_274.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=LR
+	N0 [label="Permit Management" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N1 [label="License Plate Recognition" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+	N2 [label="Reservations System" color="#C2B2F0" fillcolor="#EFE6FF" shape=diamond style=filled]
+	N3 [label="Enforcement and Fines Management" color="#FF8A65" fillcolor="#FBE9E7" shape=octagon style=filled]
+	N4 [label="IoT Sensors for Parking" color="#C2B2F0" fillcolor="#EFE6FF" shape=octagon style=filled]
+	N5 [label="Smart City Integration for Parking" color="#FF8A65" fillcolor="#FBE9E7" shape=Mdiamond style=filled]
+	N6 [label="Access Control Systems" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+	N7 [label="Ticketing System Integration" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+	N8 [label="Electric Vehicle Charging Integration" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N9 [label="On_Street Parking Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=folder style=filled]
+	N10 [label="Violation Detection" color="#FF8A65" fillcolor="#FBE9E7" shape=folder style=filled]
+	N11 [label="Space Detection" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N12 [label="Cloud_based Parking Platforms" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N13 [label="Demand Forecasting" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N14 [label="Dynamic Pricing" color="#DCE775" fillcolor="#F9FBE7" shape=octagon style=filled]
+	N15 [label="Integration with Navigation Apps" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N16 [label="Navigation to Open Space" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	S0 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Barrier Gate Control" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Billing and Reconciliation" color="#C2B2F0" fillcolor="#EFE6FF" shape=oval style=filled]
+		nest0_1 [label="Edge Computing for Parking Data" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Off_Street Parking Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Parking Guidance Systems" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+		nest1_1 [label="Automated Parking Garages" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+		nest1_2 [label="Event Parking Management" color="#DCE775" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+		nest1_3 [label="Valet Parking Automation" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [label=reserves color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N12 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N2 [label=integrates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [label=identifies color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S2 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N16 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [label=installs color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M2 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_275.txt b/test/graphviz/graph_hard/graphviz_275.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5a21972b50e9476e7ef0506f030cbbf998bbde53
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_275.txt
@@ -0,0 +1,46 @@
+<Access Control Systems, connectedTo, Violation Detection>
+<Access Control Systems, partOf, Access Control Systems>
+<Automated Parking Garages, connectedTo, Access Control Systems>
+<Automated Parking Garages, connectedTo, Emergency Vehicle Access Management>
+<Automated Payment, connectedTo, Barrier Gate Control>
+<Automated Payment, connectedTo, Billing and Reconciliation>
+<Barrier Gate Control, connectedTo, Billing and Reconciliation>
+<Billing and Reconciliation, connectedTo, Data Analytics for Parking Usage>
+<Cloud_based Parking Platforms, connectedTo, IoT Sensors for Parking>
+<Cloud_based Parking Platforms, partOf, Cloud_based Parking Platforms>
+<Customer Support, connectedTo, Barrier Gate Control>
+<Customer Support, connectedTo, Revenue Management>
+<Data Analytics for Parking Usage, connectedTo, Enforcement and Fines Management>
+<Data Analytics for Parking Usage, connectedTo, Mobile Parking Apps>
+<Data Analytics for Parking Usage, connectedTo, Permit Management>
+<Data Analytics for Parking Usage, connectedTo, Ticketing System Integration>
+<Demand Forecasting, connectedTo, Cloud_based Parking Platforms>
+<Demand Forecasting, partOf, Demand Forecasting>
+<Edge Computing for Parking Data, connectedTo, Enforcement and Fines Management>
+<Emergency Vehicle Access Management, connectedTo, Billing and Reconciliation>
+<Emergency Vehicle Access Management, connectedTo, Data Analytics for Parking Usage>
+<Emergency Vehicle Access Management, connectedTo, Off_Street Parking Management>
+<Emergency Vehicle Access Management, connectedTo, Vacancy Monitoring>
+<Emergency Vehicle Access Management, repairs, Edge Computing for Parking Data>
+<Environmental Impact Monitoring, connectedTo, Automated Parking Garages>
+<Environmental Impact Monitoring, develops, Billing and Reconciliation>
+<Fleet Parking Solutions, connectedTo, Edge Computing for Parking Data>
+<IoT Sensors for Parking, connectedTo, User Experience Design for Apps>
+<IoT Sensors for Parking, partOf, IoT Sensors for Parking>
+<Maintenance of Systems, connectedTo, Navigation to Open Space>
+<Mobile Parking Apps, connectedTo, Permit Management>
+<Navigation to Open Space, connectedTo, Environmental Impact Monitoring>
+<Off_Street Parking Management, connectedTo, Barrier Gate Control>
+<Off_Street Parking Management, connectedTo, Vacancy Monitoring>
+<Permit Management, connectedTo, Ticketing System Integration>
+<Revenue Management, identifies, Maintenance of Systems>
+<Ticketing System Integration, connectedTo, Demand Forecasting>
+<Ticketing System Integration, connectedTo, Fleet Parking Solutions>
+<User Experience Design for Apps, connectedTo, Mobile Parking Apps>
+<User Experience Design for Apps, partOf, User Experience Design for Apps>
+<Vacancy Monitoring, connectedTo, Automated Payment>
+<Vacancy Monitoring, connectedTo, Barrier Gate Control>
+<Vacancy Monitoring, connectedTo, Data Analytics for Parking Usage>
+<Vacancy Monitoring, connectedTo, Mobile Parking Apps>
+<Violation Detection, connectedTo, Edge Computing for Parking Data>
+<Violation Detection, partOf, Violation Detection>
diff --git a/test/graphviz/graph_hard/graphviz_276.dot b/test/graphviz/graph_hard/graphviz_276.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1bf5e4b7c18cdde2fa0b35636b6934c52362b857
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_276.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=LR
+	N0 [label="Electric Vehicle Charging Integration" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N1 [label="Maintenance of Systems" color="#4DD0E1" fillcolor="#C9F0F0" shape=plaintext style=filled]
+	N2 [label="Intelligent Traffic Management Interaction" color="#4DD0E1" fillcolor="#C9F0F0" shape=octagon style=filled]
+	N3 [label="Ticketing System Integration" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N4 [label="Environmental Impact Monitoring" color="#4DD0E1" fillcolor="#C9F0F0" shape=parallelogram style=filled]
+	N5 [label="Billing and Reconciliation" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N6 [label="Automated Payment" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+	N7 [label="Valet Parking Automation" color="#80DDEA" fillcolor="#D3F7F9" shape=Mdiamond style=filled]
+	N8 [label="Emergency Vehicle Access Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N9 [label="Off_Street Parking Management" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N10 [label="Revenue Management" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N11 [label="Navigation to Open Space" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N12 [label="Vacancy Monitoring" color="#80DDEA" fillcolor="#D3F7F9" shape=parallelogram style=filled]
+	N13 [label="Barrier Gate Control" color="#4DD0E1" fillcolor="#C9F0F0" shape=diamond style=filled]
+	N14 [label="Security Surveillance" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N15 [label="Parking Guidance Systems" color="#4DD0E1" fillcolor="#C9F0F0" shape=folder style=filled]
+	N16 [label="Fleet Parking Solutions" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	S0 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Space Detection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Smart City Integration for Parking" color="#7E57C2" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+		nest0_1 [label="User Experience Design for Apps" color="#4DD0E1" fillcolor="#C9F0F0" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Edge Computing for Parking Data" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Data Analytics for Parking Usage" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+		nest1_1 [label="Access Control Systems" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+		nest1_2 [label="On_Street Parking Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+		nest1_3 [label="Event Parking Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest1_0 -> nest1_1 [label=upgrades color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [label=displays color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=forecasts color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [label=secures color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N15 -> nest0_0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> S0 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S1 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [label=pays color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [label=validates color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	M1 -> N13 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	M2 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_276.txt b/test/graphviz/graph_hard/graphviz_276.txt
new file mode 100644
index 0000000000000000000000000000000000000000..91e91c77cea1eac3681171887682d6fe2de1cc3c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_276.txt
@@ -0,0 +1,41 @@
+<Access Control Systems, displays, On_Street Parking Management>
+<Access Control Systems, partOf, Access Control Systems>
+<Automated Payment, connectedTo, Valet Parking Automation>
+<Barrier Gate Control, connectedTo, Security Surveillance>
+<Barrier Gate Control, pays, Parking Guidance Systems>
+<Barrier Gate Control, validates, Fleet Parking Solutions>
+<Billing and Reconciliation, connectedTo, Automated Payment>
+<Data Analytics for Parking Usage, partOf, Data Analytics for Parking Usage>
+<Data Analytics for Parking Usage, upgrades, Access Control Systems>
+<Electric Vehicle Charging Integration, connectedTo, Billing and Reconciliation>
+<Electric Vehicle Charging Integration, connectedTo, Maintenance of Systems>
+<Electric Vehicle Charging Integration, connectedTo, Ticketing System Integration>
+<Emergency Vehicle Access Management, connectedTo, Off_Street Parking Management>
+<Environmental Impact Monitoring, connectedTo, Barrier Gate Control>
+<Environmental Impact Monitoring, connectedTo, Billing and Reconciliation>
+<Event Parking Management, connectedTo, Barrier Gate Control>
+<Event Parking Management, partOf, Event Parking Management>
+<Intelligent Traffic Management Interaction, connectedTo, Ticketing System Integration>
+<Maintenance of Systems, connectedTo, Barrier Gate Control>
+<Maintenance of Systems, connectedTo, Billing and Reconciliation>
+<Maintenance of Systems, connectedTo, Intelligent Traffic Management Interaction>
+<Maintenance of Systems, connectedTo, Ticketing System Integration>
+<Navigation to Open Space, connectedTo, Vacancy Monitoring>
+<Off_Street Parking Management, connectedTo, Revenue Management>
+<On_Street Parking Management, connectedTo, Event Parking Management>
+<On_Street Parking Management, partOf, On_Street Parking Management>
+<Parking Guidance Systems, connectedTo, Smart City Integration for Parking>
+<Parking Guidance Systems, secures, Fleet Parking Solutions>
+<Revenue Management, connectedTo, Navigation to Open Space>
+<Security Surveillance, connectedTo, Parking Guidance Systems>
+<Smart City Integration for Parking, connectedTo, User Experience Design for Apps>
+<Smart City Integration for Parking, partOf, Smart City Integration for Parking>
+<Ticketing System Integration, connectedTo, Billing and Reconciliation>
+<Ticketing System Integration, forecasts, Environmental Impact Monitoring>
+<User Experience Design for Apps, connectedTo, Environmental Impact Monitoring>
+<User Experience Design for Apps, partOf, User Experience Design for Apps>
+<Vacancy Monitoring, connectedTo, Barrier Gate Control>
+<Valet Parking Automation, connectedTo, Barrier Gate Control>
+<Valet Parking Automation, connectedTo, Data Analytics for Parking Usage>
+<Valet Parking Automation, connectedTo, Emergency Vehicle Access Management>
+<Valet Parking Automation, connectedTo, Navigation to Open Space>
diff --git a/test/graphviz/graph_hard/graphviz_277.dot b/test/graphviz/graph_hard/graphviz_277.dot
new file mode 100644
index 0000000000000000000000000000000000000000..31ef888aa65eb62dacebbc6cffcdc4d63275eca4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_277.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=TD
+	N0 [label="Queue Management" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N1 [label="Resale Market Integration" color="#FF9800" fillcolor="#FFE0B2" shape=plaintext style=filled]
+	N2 [label="Sports Event Ticketing" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N3 [label="Access Control" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N4 [label="Seat Mapping" color="#FF9800" fillcolor="#FFE0B2" shape=octagon style=filled]
+	N5 [label="API Integration for Partners" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N6 [label="Order Confirmation" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	N7 [label="Box Office Management" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N8 [label="Festival Ticketing" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N9 [label="Scalper Prevention" color="#80DDEA" fillcolor="#D3F7F9" shape=diamond style=filled]
+	N10 [label="Payment Processing" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N11 [label="Venue Capacity Management" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	S0 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Museum Ticketing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Public Transport Ticketing" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+		nest0_1 [label="Pricing Configuration" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Event Creation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Fan Loyalty Programs" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+		nest1_1 [label="Ticket Delivery" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+		nest1_2 [label="Subscription or Season Pass Management" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+		nest1_3 [label="Airline Ticketing" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N6 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N3 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N8 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_277.txt b/test/graphviz/graph_hard/graphviz_277.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6c3ca109f08d404fd6f8c437a406005a5f9469f8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_277.txt
@@ -0,0 +1,35 @@
+<API Integration for Partners, connectedTo, Order Confirmation>
+<Access Control, connectedTo, Seat Mapping>
+<Airline Ticketing, connectedTo, Access Control>
+<Airline Ticketing, partOf, Airline Ticketing>
+<Box Office Management, connectedTo, Festival Ticketing>
+<Box Office Management, connectedTo, Scalper Prevention>
+<Fan Loyalty Programs, connectedTo, Ticket Delivery>
+<Fan Loyalty Programs, partOf, Fan Loyalty Programs>
+<Festival Ticketing, connectedTo, Payment Processing>
+<Festival Ticketing, connectedTo, Scalper Prevention>
+<Festival Ticketing, connectedTo, Venue Capacity Management>
+<Order Confirmation, connectedTo, Box Office Management>
+<Order Confirmation, connectedTo, Scalper Prevention>
+<Payment Processing, connectedTo, Venue Capacity Management>
+<Pricing Configuration, connectedTo, Order Confirmation>
+<Pricing Configuration, partOf, Pricing Configuration>
+<Public Transport Ticketing, connectedTo, Pricing Configuration>
+<Public Transport Ticketing, partOf, Public Transport Ticketing>
+<Queue Management, connectedTo, Box Office Management>
+<Queue Management, connectedTo, Order Confirmation>
+<Queue Management, connectedTo, Resale Market Integration>
+<Queue Management, connectedTo, Seat Mapping>
+<Resale Market Integration, connectedTo, Public Transport Ticketing>
+<Resale Market Integration, connectedTo, Sports Event Ticketing>
+<Scalper Prevention, connectedTo, Payment Processing>
+<Seat Mapping, connectedTo, API Integration for Partners>
+<Seat Mapping, connectedTo, Fan Loyalty Programs>
+<Seat Mapping, connectedTo, Scalper Prevention>
+<Sports Event Ticketing, connectedTo, Access Control>
+<Sports Event Ticketing, connectedTo, Payment Processing>
+<Sports Event Ticketing, connectedTo, Scalper Prevention>
+<Subscription or Season Pass Management, connectedTo, Airline Ticketing>
+<Subscription or Season Pass Management, partOf, Subscription or Season Pass Management>
+<Ticket Delivery, connectedTo, Subscription or Season Pass Management>
+<Ticket Delivery, partOf, Ticket Delivery>
diff --git a/test/graphviz/graph_hard/graphviz_278.dot b/test/graphviz/graph_hard/graphviz_278.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6ea16c05b3b2fa7f9d4a0e89dcce009971a51aaa
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_278.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Refund Management" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N1 [label="API Integration for Partners" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N2 [label="Ticket Sales" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N3 [label="Theme Park Ticketing" color="#FFD54F" fillcolor="#FFF8E1" shape=parallelogram style=filled]
+	N4 [label="Audience Segmentation" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N5 [label="Concert Ticketing" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N6 [label="Seat Mapping" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N7 [label="Public Transport Ticketing" color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+	N8 [label="Agent Network Management" color="#FFA726" fillcolor="#FFF3E0" shape=folder style=filled]
+	N9 [label="Fraud Prevention" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N10 [label="Festival Ticketing" color="#FFA726" fillcolor="#FFF3E0" shape=octagon style=filled]
+	N11 [label="Queue Management" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N12 [label="Customer Relationship Management Integration" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N13 [label="Dynamic Pricing" color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+	N14 [label="Group Booking Management" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N15 [label="Post_Event Feedback Collection" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N16 [label="Scalper Prevention" color="#92C79A" fillcolor="#E8F0EA" shape=oval style=filled]
+	N17 [label="Waiting List Management" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N18 [label="Analytics on Sales Data" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Mobile Ticketing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Event Creation" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+		nest0_1 [label="Venue Capacity Management" color="#92C79A" fillcolor="#E8F0EA" shape=octagon style=filled]
+		nest0_2 [label="Fan Loyalty Programs" color="#FFD54F" fillcolor="#FFF8E1" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Event Promotion Tools" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Personalized Ticket Offers" color="#92C79A" fillcolor="#E8F0EA" shape=diamond style=filled]
+		nest1_1 [label="Payment Processing" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+		nest1_2 [label="Access Control" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label=responds color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [label=connects color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [label=publishes color="#000000" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N17 -> nest0_0 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N3 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [label=payments color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [label=validates color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N15 [label=personalizes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_279.txt b/test/graphviz/graph_hard/graphviz_279.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f9341d123196c98c1fcad70ac10f0724b693e8f0
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_279.txt
@@ -0,0 +1,38 @@
+<API Integration for Partners, connectedTo, Concert Ticketing>
+<API Integration for Partners, connectedTo, Public Transport Ticketing>
+<Agent Network Management, connectedTo, Refund Management>
+<Agent Network Management, connectedTo, Ticket Delivery>
+<Blockchain Ticketing for Authenticity, connectedTo, Theme Park Ticketing>
+<Concert Ticketing, connectedTo, Public Transport Ticketing>
+<Concert Ticketing, connectedTo, Sports Event Ticketing>
+<Event Creation, connectedTo, Dynamic Pricing>
+<Event Creation, partOf, Event Creation>
+<Group Booking Management, connectedTo, Event Creation>
+<Group Booking Management, partOf, Group Booking Management>
+<Mobile Ticketing, connectedTo, Theater Ticketing>
+<Order Confirmation, connectedTo, Personalized Ticket Offers>
+<Order Confirmation, partOf, Order Confirmation>
+<Personalized Ticket Offers, connectedTo, Pricing Configuration>
+<Personalized Ticket Offers, partOf, Personalized Ticket Offers>
+<Pricing Configuration, connectedTo, Agent Network Management>
+<Pricing Configuration, connectedTo, Refund Management>
+<Promotional Code Management, connectedTo, Dynamic Pricing>
+<Promotional Code Management, connectedTo, Ticket Delivery>
+<Promotional Code Management, connectedTo, Waiting List Management>
+<Public Transport Ticketing, connectedTo, Mobile Ticketing>
+<Refund Management, connectedTo, Dynamic Pricing>
+<Resale Market Integration, connectedTo, Order Confirmation>
+<Resale Market Integration, partOf, Resale Market Integration>
+<Scalper Prevention, connectedTo, Group Booking Management>
+<Scalper Prevention, partOf, Scalper Prevention>
+<Sports Event Ticketing, connectedTo, Public Transport Ticketing>
+<Sports Event Ticketing, connectedTo, Refund Management>
+<Sports Event Ticketing, connectedTo, Scalper Prevention>
+<Sports Event Ticketing, connectedTo, Theme Park Ticketing>
+<Sports Event Ticketing, connectedTo, Ticket Delivery>
+<Theater Ticketing, connectedTo, Promotional Code Management>
+<Theme Park Ticketing, connectedTo, Refund Management>
+<Theme Park Ticketing, connectedTo, Resale Market Integration>
+<Ticket Delivery, connectedTo, Blockchain Ticketing for Authenticity>
+<Ticket Sales, connectedTo, Pricing Configuration>
+<Waiting List Management, connectedTo, Ticket Sales>
diff --git a/test/graphviz/graph_hard/graphviz_28.dot b/test/graphviz/graph_hard/graphviz_28.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f094a32bfc948dc23f700f65ead1d0f9bd3b16ef
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_28.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=BT
+	N0 [label="Issue Resolution" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N1 [label="Network Security Monitoring" color="#92C79A" fillcolor="#E8F0EA" shape=folder style=filled]
+	N2 [label="Number Porting" color="#92C79A" fillcolor="#E8F0EA" shape=plaintext style=filled]
+	N3 [label="Broadband Provisioning" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N4 [label="Device Setup" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N5 [label="SMS Delivery" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N6 [label="Payment Received" color="#92C79A" fillcolor="#E8F0EA" shape=oval style=filled]
+	N7 [label="MMS Transmission" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N8 [label="Bandwidth Allocation" color="#FF8A65" fillcolor="#FBE9E7" shape=plaintext style=filled]
+	N9 [label="Network Upgrade" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N10 [label="Plan Renewal" color="#FF8A65" fillcolor="#FBE9E7" shape=diamond style=filled]
+	N11 [label="Service Level Agreement" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N12 [label="Usage Monitoring" color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+	N13 [label="Roaming Activation" color="#9575CD" fillcolor="#EDE7F6" shape=octagon style=filled]
+	N14 [label="Plan Suspension" color="#9575CD" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N15 [label="IoT Device Connection" color="#9575CD" fillcolor="#EDE7F6" shape=Mdiamond style=filled]
+	N16 [label="Outage Detection" color="#9575CD" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N17 [label="Plan Selection" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N18 [label="Mobile Top_up" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	S0 [label="" color="#92C79A" fillcolor="#E8F0EA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#92C79A" fillcolor="#E8F0EA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="VoIP Service" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Call Recording" color="#92C79A" fillcolor="#E8F0EA" shape=parallelogram style=filled]
+		nest0_1 [label="Troubleshooting Guide" color="#92C79A" fillcolor="#E8F0EA" shape=folder style=filled]
+		nest0_2 [label="Technical Support Escalation" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Fiber Optic Deployment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="SIM Registration" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+		nest1_1 [label="Customer Support" color="#FF8A65" fillcolor="#FBE9E7" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N4 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N10 -> S1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N16 -> nest1_1 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N14 -> N16 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N8 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N8 -> N4 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_28.txt b/test/graphviz/graph_hard/graphviz_28.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bea0faa19a4801b659a5697b6b89d027e93de023
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_28.txt
@@ -0,0 +1,40 @@
+<Bandwidth Allocation, connectedTo, Device Setup>
+<Bandwidth Allocation, connectedTo, Network Upgrade>
+<Broadband Provisioning, connectedTo, Device Setup>
+<Call Recording, connectedTo, Troubleshooting Guide>
+<Call Recording, partOf, Call Recording>
+<Customer Support, connectedTo, Device Setup>
+<Customer Support, partOf, Customer Support>
+<Device Setup, connectedTo, SMS Delivery>
+<IoT Device Connection, connectedTo, Outage Detection>
+<Issue Resolution, connectedTo, Network Security Monitoring>
+<MMS Transmission, connectedTo, Bandwidth Allocation>
+<Network Security Monitoring, connectedTo, Number Porting>
+<Network Upgrade, connectedTo, Plan Renewal>
+<Number Porting, connectedTo, Broadband Provisioning>
+<Number Porting, connectedTo, Device Setup>
+<Number Porting, connectedTo, Network Upgrade>
+<Number Porting, connectedTo, Outage Detection>
+<Number Porting, connectedTo, SMS Delivery>
+<Outage Detection, connectedTo, Customer Support>
+<Outage Detection, connectedTo, Plan Selection>
+<Payment Received, connectedTo, MMS Transmission>
+<Plan Renewal, connectedTo, Call Recording>
+<Plan Renewal, connectedTo, Mobile Top_up>
+<Plan Renewal, connectedTo, Plan Selection>
+<Plan Renewal, connectedTo, SIM Registration>
+<Plan Renewal, connectedTo, Service Level Agreement>
+<Plan Selection, connectedTo, Mobile Top_up>
+<Plan Suspension, connectedTo, IoT Device Connection>
+<Plan Suspension, connectedTo, Outage Detection>
+<Roaming Activation, connectedTo, Plan Suspension>
+<SIM Registration, connectedTo, Customer Support>
+<SIM Registration, partOf, SIM Registration>
+<SMS Delivery, connectedTo, Payment Received>
+<Service Level Agreement, connectedTo, Usage Monitoring>
+<Technical Support Escalation, connectedTo, Device Setup>
+<Technical Support Escalation, partOf, Technical Support Escalation>
+<Troubleshooting Guide, connectedTo, Technical Support Escalation>
+<Troubleshooting Guide, partOf, Troubleshooting Guide>
+<Usage Monitoring, connectedTo, Bandwidth Allocation>
+<Usage Monitoring, connectedTo, Roaming Activation>
diff --git a/test/graphviz/graph_hard/graphviz_280.txt b/test/graphviz/graph_hard/graphviz_280.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8b57a11c6daed9767d607532cdf60e6aa335afa5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_280.txt
@@ -0,0 +1,38 @@
+<Cryptographic Security, connectedTo, Cybersecurity for Voting Systems>
+<Cryptographic Security, partOf, Cryptographic Security>
+<Cybersecurity for Voting Systems, connectedTo, Hardware Tamper Detection>
+<Cybersecurity for Voting Systems, connectedTo, Touchscreen Voting Machines>
+<Election Official Training, connectedTo, Secure Data Transmission>
+<Election Official Training, transmits, Software Integrity Checks>
+<Hardware Tamper Detection, connectedTo, Public Trust Building>
+<Hardware Tamper Detection, connectedTo, Secure Data Transmission>
+<Hardware Tamper Detection, connectedTo, Security Protocols>
+<Hardware Tamper Detection, connectedTo, Voter Registration>
+<Hardware Tamper Detection, connectedTo, Zero_Knowledge Proofs for Privacy>
+<Online Voting Systems, connectedTo, Cybersecurity for Voting Systems>
+<Optical Scan Systems, connectedTo, Risk Management for Elections>
+<Optical Scan Systems, partOf, Optical Scan Systems>
+<Post_Election Audits, connectedTo, Voter Education Programs>
+<Post_Election Audits, maintains, Zero_Knowledge Proofs for Privacy>
+<Public Trust Building, connectedTo, Undue Influence Prevention>
+<Public Trust Building, partOf, Public Trust Building>
+<Risk Management for Elections, connectedTo, Voter Education Programs>
+<Risk Management for Elections, partOf, Risk Management for Elections>
+<Security Protocols, connectedTo, Secure Data Transmission>
+<Software Integrity Checks, connectedTo, Hardware Tamper Detection>
+<Software Integrity Checks, connectedTo, Secure Data Transmission>
+<Software Integrity Checks, connectedTo, Voter Authentication>
+<Software Integrity Checks, connectedTo, Zero_Knowledge Proofs for Privacy>
+<Touchscreen Voting Machines, connectedTo, Optical Scan Systems>
+<Touchscreen Voting Machines, partOf, Touchscreen Voting Machines>
+<Undue Influence Prevention, connectedTo, Cryptographic Security>
+<Undue Influence Prevention, partOf, Undue Influence Prevention>
+<Voter Authentication, connectedTo, Voter Privacy Protection>
+<Voter Education Programs, connectedTo, Online Voting Systems>
+<Voter Privacy Protection, connectedTo, Post_Election Audits>
+<Voter Privacy Protection, connectedTo, Secure Data Transmission>
+<Voter Privacy Protection, connectedTo, Security Protocols>
+<Voter Privacy Protection, connectedTo, Voter Education Programs>
+<Voter Privacy Protection, connectedTo, Zero_Knowledge Proofs for Privacy>
+<Voter Registration, connectedTo, Security Protocols>
+<Zero_Knowledge Proofs for Privacy, connectedTo, Voter Registration>
diff --git a/test/graphviz/graph_hard/graphviz_281.txt b/test/graphviz/graph_hard/graphviz_281.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c183587835e98ebb47fdab77009dc7fd3500be7a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_281.txt
@@ -0,0 +1,32 @@
+<Auditability, connectedTo, Public Trust Building>
+<Auditability, connectedTo, Transparency>
+<Blockchain for Voting, connectedTo, Optical Scan Systems>
+<Blockchain for Voting, partOf, Blockchain for Voting>
+<Cryptographic Security, connectedTo, Optical Scan Systems>
+<Cryptographic Security, partOf, Cryptographic Security>
+<Direct Recording Electronic Systems, connectedTo, Election Official Training>
+<Direct Recording Electronic Systems, connectedTo, Optical Scan Systems>
+<Direct Recording Electronic Systems, connectedTo, Security Protocols>
+<Election Official Training, partOf, Election Official Training>
+<Election Official Training, stores, Remote Voting Solutions>
+<Online Voting Systems, connectedTo, Post_Election Audits>
+<Optical Scan Systems, connectedTo, Online Voting Systems>
+<Optical Scan Systems, connectedTo, Post_Election Audits>
+<Optical Scan Systems, connectedTo, Touchscreen Voting Machines>
+<Optical Scan Systems, connectedTo, Zero_Knowledge Proofs for Privacy>
+<Post_Election Audits, connectedTo, Zero_Knowledge Proofs for Privacy>
+<Public Trust Building, connectedTo, Transparency>
+<Public Trust Building, connectedTo, Voter Education Programs>
+<Remote Voting Solutions, casts, Blockchain for Voting>
+<Remote Voting Solutions, partOf, Remote Voting Solutions>
+<Risk Management for Elections, connectedTo, Transparency>
+<Security Protocols, connectedTo, Cryptographic Security>
+<Security Protocols, partOf, Security Protocols>
+<Touchscreen Voting Machines, connectedTo, Online Voting Systems>
+<Transparency, connectedTo, Direct Recording Electronic Systems>
+<Transparency, connectedTo, Online Voting Systems>
+<Transparency, connectedTo, Optical Scan Systems>
+<Transparency, connectedTo, Touchscreen Voting Machines>
+<Transparency, connectedTo, Zero_Knowledge Proofs for Privacy>
+<Voter Education Programs, connectedTo, Risk Management for Elections>
+<Voter Education Programs, connectedTo, Transparency>
diff --git a/test/graphviz/graph_hard/graphviz_282.dot b/test/graphviz/graph_hard/graphviz_282.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3770b1850b4de170fdf9d1877b2b675e4dbf250c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_282.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=RL
+	N0 [label="Accessibility Features" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N1 [label="Cryptographic Security" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N2 [label="Election Official Training" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N3 [label="Touchscreen Voting Machines" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N4 [label="Vote Counting" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N5 [label="Post_Election Audits" color="#FFC085" fillcolor="#FFDAB9" shape=Mdiamond style=filled]
+	N6 [label="System Certification" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+	N7 [label="Software Integrity Checks" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N8 [label="Legal Framework Compliance" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N9 [label="Blockchain for Voting" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N10 [label="Hardware Tamper Detection" color="#FFC2C2" fillcolor="#FFEBEB" shape=parallelogram style=filled]
+	N11 [label="Zero_Knowledge Proofs for Privacy" color="#FFC085" fillcolor="#FFDAB9" shape=oval style=filled]
+	N12 [label="Public Trust Building" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S0 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Risk Management for Elections" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Voter Authentication" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest0_1 [label="Penetration Testing" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Anonymous Credential Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Auditability color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+		nest1_1 [label="Voter Registration" color="#FFC2C2" fillcolor="#FFEBEB" shape=parallelogram style=filled]
+		nest1_2 [label="Voter Education Programs" color="#FFC2C2" fillcolor="#FFEBEB" shape=folder style=filled]
+		nest1_3 [label="Results Aggregation" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
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new file mode 100644
index 0000000000000000000000000000000000000000..88912ca6ffb71898819b4de5560ac28e2fd9bc5a
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diff --git a/test/graphviz/graph_hard/graphviz_284.dot b/test/graphviz/graph_hard/graphviz_284.dot
new file mode 100644
index 0000000000000000000000000000000000000000..314d5ab14c4aab65868c45666ba4030598833200
--- /dev/null
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diff --git a/test/graphviz/graph_hard/graphviz_284.txt b/test/graphviz/graph_hard/graphviz_284.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0f682331796e172dd9bbd49331160b6b258e7fc0
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_284.txt
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diff --git a/test/graphviz/graph_hard/graphviz_285.dot b/test/graphviz/graph_hard/graphviz_285.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5a84f19e35bbf23f77e9c2e3735b9fffb4ceb585
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+	S0 -> N9 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N10 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_286.dot b/test/graphviz/graph_hard/graphviz_286.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3d5c59ce436ca21c4abce14f8d6c2f3e2511f94d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_286.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=RL
+	N0 [label="Research Question Refinement" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N1 [label="Grant Proposal Writing" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N2 [label="Methodology Selection" color="#E91E63" fillcolor="#F8BBD0" shape=diamond style=filled]
+	N3 [label="Intellectual Property in Research" color="#E91E63" fillcolor="#F8BBD0" shape=parallelogram style=filled]
+	N4 [label="Theory Development" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+	N5 [label="Software for Statistical Analysis" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N6 [label="Open Science Practices" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N7 [label="Public Engagement with Research" color="#80DDEA" fillcolor="#D3F7F9" shape=oval style=filled]
+	N8 [label="Manuscript Writing" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	M2 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Plagiarism Detection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Sampling Techniques" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_1 [label="Reproducibility Studies" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+		nest0_2 [label="Journal Publication" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
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+		nest0_1 -> nest0_2 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
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+		nest1_1 [label="Literature Review" color="#FFF176" fillcolor="#FFFDE7" shape=plaintext style=filled]
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+		nest1_3 [label=Meta_Analysis color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=validates color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N3 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
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+}
diff --git a/test/graphviz/graph_hard/graphviz_286.txt b/test/graphviz/graph_hard/graphviz_286.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6b13e7b550c47038a62d74d59197134234bdb3d8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_286.txt
@@ -0,0 +1,32 @@
+<Data Visualization for Research, connectedTo, Meta_Analysis>
+<Data Visualization for Research, partOf, Data Visualization for Research>
+<Grant Proposal Writing, connectedTo, Intellectual Property in Research>
+<Grant Proposal Writing, connectedTo, Methodology Selection>
+<Grant Proposal Writing, connectedTo, Research Ethics Application>
+<Grant Proposal Writing, connectedTo, Software for Statistical Analysis>
+<Intellectual Property in Research, connectedTo, Open Science Practices>
+<Intellectual Property in Research, connectedTo, Software for Statistical Analysis>
+<Intellectual Property in Research, connectedTo, Theory Development>
+<Journal Publication, connectedTo, Intellectual Property in Research>
+<Journal Publication, partOf, Journal Publication>
+<Literature Review, connectedTo, Data Visualization for Research>
+<Literature Review, partOf, Literature Review>
+<Meta_Analysis, connectedTo, Software for Statistical Analysis>
+<Meta_Analysis, partOf, Meta_Analysis>
+<Methodology Selection, connectedTo, Intellectual Property in Research>
+<Methodology Selection, connectedTo, Manuscript Writing>
+<Methodology Selection, connectedTo, Open Science Practices>
+<Methodology Selection, connectedTo, Software for Statistical Analysis>
+<Open Science Practices, connectedTo, Public Engagement with Research>
+<Public Engagement with Research, connectedTo, Manuscript Writing>
+<Public Engagement with Research, connectedTo, Sampling Techniques>
+<Reproducibility Studies, connectedTo, Journal Publication>
+<Reproducibility Studies, partOf, Reproducibility Studies>
+<Research Ethics Application, connectedTo, Literature Review>
+<Research Ethics Application, partOf, Research Ethics Application>
+<Research Question Refinement, connectedTo, Grant Proposal Writing>
+<Research Question Refinement, connectedTo, Intellectual Property in Research>
+<Sampling Techniques, connectedTo, Reproducibility Studies>
+<Sampling Techniques, partOf, Sampling Techniques>
+<Software for Statistical Analysis, connectedTo, Open Science Practices>
+<Theory Development, validates, Software for Statistical Analysis>
diff --git a/test/graphviz/graph_hard/graphviz_287.txt b/test/graphviz/graph_hard/graphviz_287.txt
new file mode 100644
index 0000000000000000000000000000000000000000..344d6a38f053ff86ecd60fc0c9a3fdc2762ca200
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_287.txt
@@ -0,0 +1,37 @@
+<Academic Mentorship, connectedTo, Data Visualization for Research>
+<Citation Management, connectedTo, Peer Review Process>
+<Citation Management, connectedTo, Statistical Analysis>
+<Citation Management, connectedTo, Thesis or Dissertation Writing>
+<Data Visualization for Research, connectedTo, Grant Proposal Writing>
+<Experiment Design, connectedTo, Data Visualization for Research>
+<Experiment Design, partOf, Experiment Design>
+<Grant Proposal Writing, connectedTo, Reproducibility Studies>
+<Literature Review, connectedTo, Grant Proposal Writing>
+<Literature Review, connectedTo, Peer Review Process>
+<Literature Review, connectedTo, Research Design>
+<Literature Review, connectedTo, Thesis or Dissertation Writing>
+<Literature Review, interprets, Peer Review Process>
+<Manuscript Writing, connectedTo, Survey Design>
+<Manuscript Writing, partOf, Manuscript Writing>
+<Open Science Practices, connectedTo, Manuscript Writing>
+<Open Science Practices, partOf, Open Science Practices>
+<Peer Review Process, assesses, Thesis or Dissertation Writing>
+<Peer Review Process, connectedTo, Variable Identification>
+<Public Engagement with Research, connectedTo, Experiment Design>
+<Public Engagement with Research, partOf, Public Engagement with Research>
+<Reproducibility Studies, connectedTo, Model Building>
+<Research Design, connectedTo, Citation Management>
+<Research Design, data management, Open Science Practices>
+<Research Design, innovates, Peer Review Process>
+<Statistical Analysis, connectedTo, Data Visualization for Research>
+<Statistical Analysis, connectedTo, Peer Review Process>
+<Statistical Analysis, connectedTo, Thesis or Dissertation Writing>
+<Statistical Analysis, researches, Survey Design>
+<Survey Design, connectedTo, Peer Review Process>
+<Survey Design, connectedTo, Theory Development>
+<Theory Development, connectedTo, Public Engagement with Research>
+<Theory Development, partOf, Theory Development>
+<Thesis or Dissertation Writing, connectedTo, Academic Mentorship>
+<Thesis or Dissertation Writing, connectedTo, Data Visualization for Research>
+<Thesis or Dissertation Writing, connectedTo, Model Building>
+<Variable Identification, connectedTo, Thesis or Dissertation Writing>
diff --git a/test/graphviz/graph_hard/graphviz_288.dot b/test/graphviz/graph_hard/graphviz_288.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2dfd1105de8c9b4ae051e844d900166c23e5fada
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_288.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=LR
+	N0 [label="Experiment Design" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N1 [label=Meta_Analysis color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N2 [label="Poster Session Preparation" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N3 [label="Power Analysis" color="#FFA726" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N4 [label="Funding Agency Reporting" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N5 [label="Data Analysis" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N6 [label="Research Design" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N7 [label="Thesis or Dissertation Writing" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N8 [label="Intellectual Property in Research" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N9 [label="Academic Mentorship" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N10 [label="Literature Review" color="#FFA726" fillcolor="#FFF3E0" shape=folder style=filled]
+	N11 [label="Plagiarism Detection" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N12 [label="Hypothesis Formulation" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N13 [label="Systematic Review" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	M1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
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+		nest0_1 -> nest0_2 [label=innovates color="#FFA726" dir=forward penwidth=1.5 style=dashed]
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+	subgraph cluster_Group1 {
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+		nest1_1 [label="Theory Development" color="#6FE1D5" fillcolor="#C9EFEC" shape=folder style=filled]
+		nest1_2 [label="Peer Review Process" color="#FFA726" fillcolor="#FFF3E0" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
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+	N8 -> N9 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [label=researches color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N9 -> S1 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#AED581" dir=forward penwidth=1.5 style=solid]
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+}
diff --git a/test/graphviz/graph_hard/graphviz_289.txt b/test/graphviz/graph_hard/graphviz_289.txt
new file mode 100644
index 0000000000000000000000000000000000000000..45d122ed89d2cd33b2e53337048e3f9b100fa83d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_289.txt
@@ -0,0 +1,42 @@
+<Acquisitions, connectedTo, Digital Resource Management>
+<Acquisitions, connectedTo, Discovery Layers>
+<Acquisitions, connectedTo, Personalized Recommendations>
+<Acquisitions, connectedTo, User Account Management>
+<Acquisitions, implements, Archival Integration>
+<Archival Integration, connectedTo, Metadata Creation>
+<Cataloging and Classification, connectedTo, Mobile App for Library>
+<Database Management, connectedTo, Preservation of Materials>
+<Digitization Projects, connectedTo, System Security>
+<Discovery Layers, connectedTo, Library Management Systems>
+<Discovery Layers, partOf, Discovery Layers>
+<Electronic Resource Management, connectedTo, Subject Indexing>
+<Integrated Library Systems, connectedTo, Personalized Recommendations>
+<Interlibrary Loan, connectedTo, Integrated Library Systems>
+<Interlibrary Loan, connectedTo, Library Website Management>
+<Library Management Systems, connectedTo, Self_Checkout Kiosks>
+<Library Management Systems, partOf, Library Management Systems>
+<Library Website Management, connectedTo, Linked Data for Libraries>
+<Library Website Management, partOf, Library Website Management>
+<Linked Data for Libraries, connectedTo, System Security>
+<Linked Data for Libraries, partOf, Linked Data for Libraries>
+<Metadata Creation, connectedTo, Resource Sharing Networks>
+<Mobile App for Library, connectedTo, Acquisitions>
+<Mobile App for Library, connectedTo, Integrated Library Systems>
+<Personalized Recommendations, connectedTo, Database Management>
+<Preservation of Materials, assists, RFID System Implementation>
+<RFID System Implementation, connectedTo, Digital Resource Management>
+<RFID System Implementation, connectedTo, Digitization Projects>
+<RFID System Implementation, connectedTo, Self_Checkout Kiosks>
+<RFID System Implementation, reports, System Security>
+<Resource Sharing Networks, connectedTo, User Account Management>
+<Resource Sharing Networks, digitizes, Digital Resource Management>
+<Resource Sharing Networks, reserves, Integrated Library Systems>
+<Search Functionality, connectedTo, Digital Resource Management>
+<Search Functionality, connectedTo, Digitization Projects>
+<Search Functionality, connectedTo, User Training on Systems>
+<Self_Checkout Kiosks, connectedTo, Digitization Projects>
+<Subject Indexing, connectedTo, Search Functionality>
+<System Security, connectedTo, Digital Resource Management>
+<User Account Management, connectedTo, Interlibrary Loan>
+<User Training on Systems, connectedTo, Cataloging and Classification>
+<User Training on Systems, connectedTo, Digitization Projects>
diff --git a/test/graphviz/graph_hard/graphviz_290.dot b/test/graphviz/graph_hard/graphviz_290.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2258984d62d8fbe549b70c5692fe25bbaac29feb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_290.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=RL
+	N0 [label="Serials Control" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N1 [label="Technical Support for Systems" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N2 [label=Acquisitions color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N3 [label="Subject Indexing" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+	N4 [label="Reporting and Analytics" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N5 [label="Open Access Repository Management" color="#AED581" fillcolor="#F0F4C3" shape=oval style=filled]
+	N6 [label="Data Migration" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N7 [label="Digital Resource Management" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N8 [label="Personalized Recommendations" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N9 [label="Discovery Layers" color="#AED581" fillcolor="#F0F4C3" shape=parallelogram style=filled]
+	N10 [label="Circulation Management" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	S0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	M1 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
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+		nest0_1 [label="Federated Search" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [label=displays color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	}
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+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Online Public Access Catalog" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Preservation of Materials" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+		nest1_1 [label="Library Website Management" color="#AED581" fillcolor="#F0F4C3" shape=parallelogram style=filled]
+		nest1_2 [label="Self_Checkout Kiosks" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [label=accesses color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=trains color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N7 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [label=indexes color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [label=migrates color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_291.txt b/test/graphviz/graph_hard/graphviz_291.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6d2569791a632f5fb32173c3a3b57c3df568beab
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_291.txt
@@ -0,0 +1,33 @@
+<AI in Library Services, connectedTo, Discovery Layers>
+<AI in Library Services, connectedTo, System Upgrades>
+<Archival Integration, connectedTo, System Security>
+<Archival Integration, partOf, Archival Integration>
+<Authority Control, integrates, Personalized Recommendations>
+<Authority Control, partOf, Authority Control>
+<Automated Materials Handling, connectedTo, Data Migration>
+<Automated Materials Handling, connectedTo, Database Management>
+<Automated Materials Handling, connectedTo, Digital Resource Management>
+<Automated Materials Handling, connectedTo, Search Functionality>
+<Automated Materials Handling, connectedTo, Self_Checkout Kiosks>
+<Database Management, digitizes, Digital Resource Management>
+<Digital Resource Management, reports, Data Migration>
+<Discovery Layers, connectedTo, Authority Control>
+<Discovery Layers, connectedTo, System Upgrades>
+<Federated Search, connectedTo, Interlibrary Loan>
+<Federated Search, develops, System Upgrades>
+<Interlibrary Loan, migrates, Library Management Systems>
+<Library Management Systems, connectedTo, AI in Library Services>
+<Library Management Systems, connectedTo, Data Migration>
+<Library Management Systems, connectedTo, Digital Resource Management>
+<Library Management Systems, connectedTo, System Upgrades>
+<Personalized Recommendations, connectedTo, Digital Resource Management>
+<Personalized Recommendations, partOf, Personalized Recommendations>
+<Search Functionality, connectedTo, Archival Integration>
+<Search Functionality, partOf, Search Functionality>
+<Self_Checkout Kiosks, connectedTo, Database Management>
+<System Security, connectedTo, Digital Resource Management>
+<System Security, partOf, System Security>
+<System Upgrades, connectedTo, Technical Support for Systems>
+<Technical Support for Systems, connectedTo, Automated Materials Handling>
+<Technical Support for Systems, connectedTo, Data Migration>
+<Technical Support for Systems, connectedTo, Digital Resource Management>
diff --git a/test/graphviz/graph_hard/graphviz_292.dot b/test/graphviz/graph_hard/graphviz_292.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7c5288243ec61413d2bb4147659199a80b85a1bb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_292.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=TD
+	N0 [label="Researchers Support" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N1 [label="Acquisition and Accessioning" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N2 [label="Disaster Preparedness for Archives" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N3 [label="Conservation Treatment" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N4 [label="Database Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N5 [label="Ethical Use of Archival Materials" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N6 [label="Digitization of Records" color="#00BCD4" fillcolor="#E0F7FA" shape=octagon style=filled]
+	N7 [label="Access and Reference Services" color="#00BCD4" fillcolor="#E0F7FA" shape=plaintext style=filled]
+	N8 [label="Appraisal and Selection" color="#6FE1D5" fillcolor="#C9EFEC" shape=plaintext style=filled]
+	N9 [label="Metadata Creation" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N10 [label="Born_Digital Archiving" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Collection Management Policy" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Authority Control for Archival Names" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest0_1 [label="Legal and Ethical Compliance" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Web Archiving" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Exhibition Curation" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest1_1 [label="Long_Term Digital Preservation" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest1_2 [label="Environmental Control" color="#FFCC7A" fillcolor="#FFF6D9" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=acquires color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=transcribes color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=conserves color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N10 [label=preserves color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [label=monitors color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [label=validates color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	M1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	M2 -> N4 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_293.txt b/test/graphviz/graph_hard/graphviz_293.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4b48df9de2be30ff6d0ebee4dd638314b588c2d7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_293.txt
@@ -0,0 +1,41 @@
+<Access and Reference Services, connectedTo, Born_Digital Archiving>
+<Access and Reference Services, connectedTo, Emulation for Obsolete Formats>
+<Access and Reference Services, connectedTo, Long_Term Digital Preservation>
+<Access and Reference Services, connectedTo, Metadata Creation>
+<Acquisition and Accessioning, connectedTo, Arrangement and Description>
+<Archival Advocacy, connectedTo, Preservation Planning>
+<Archival Advocacy, partOf, Archival Advocacy>
+<Arrangement and Description, connectedTo, Environmental Control>
+<Born_Digital Archiving, connectedTo, Long_Term Digital Preservation>
+<Community Archiving Projects, connectedTo, Access and Reference Services>
+<Community Archiving Projects, connectedTo, Digital Asset Management>
+<Database Management, connectedTo, Access and Reference Services>
+<Digital Asset Management, connectedTo, Access and Reference Services>
+<Digital Asset Management, connectedTo, Database Management>
+<Digital Asset Management, connectedTo, Long_Term Digital Preservation>
+<Emulation for Obsolete Formats, connectedTo, Archival Advocacy>
+<Emulation for Obsolete Formats, connectedTo, Born_Digital Archiving>
+<Environmental Control, connectedTo, Researchers Support>
+<Exhibition Curation, connectedTo, Serialization and Item Control>
+<Intellectual Property Rights Management, connectedTo, Access and Reference Services>
+<Intellectual Property Rights Management, connectedTo, Born_Digital Archiving>
+<Intellectual Property Rights Management, connectedTo, Community Archiving Projects>
+<Intellectual Property Rights Management, connectedTo, Metadata Creation>
+<Long_Term Digital Preservation, connectedTo, Metadata Creation>
+<Metadata Creation, connectedTo, Digital Forensics for Archives>
+<Preservation Planning, connectedTo, Records Transfer Processes>
+<Preservation Planning, partOf, Preservation Planning>
+<Provenance Tracking, connectedTo, Security of Holdings>
+<Provenance Tracking, partOf, Provenance Tracking>
+<Public Access Systems, connectedTo, Exhibition Curation>
+<Records Retention Scheduling, connectedTo, Provenance Tracking>
+<Records Retention Scheduling, connectedTo, User Interface for Digital Archives>
+<Records Transfer Processes, connectedTo, Intellectual Property Rights Management>
+<Records Transfer Processes, partOf, Records Transfer Processes>
+<Researchers Support, connectedTo, Access and Reference Services>
+<Researchers Support, connectedTo, Records Retention Scheduling>
+<Security of Holdings, connectedTo, Database Management>
+<Security of Holdings, partOf, Security of Holdings>
+<Serialization and Item Control, connectedTo, Subject Indexing for Archives>
+<Subject Indexing for Archives, connectedTo, Acquisition and Accessioning>
+<User Interface for Digital Archives, connectedTo, Intellectual Property Rights Management>
diff --git a/test/graphviz/graph_hard/graphviz_294.dot b/test/graphviz/graph_hard/graphviz_294.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f60298add390201eb9b8dbe514221df0c7c7db72
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_294.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=LR
+	N0 [label="Digital Asset Management" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Emulation for Obsolete Formats" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N2 [label="Database Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N3 [label="Born_Digital Archiving" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N4 [label="Outreach and Education" color="#BCB88A" fillcolor="#F5F5DC" shape=Mdiamond style=filled]
+	N5 [label="Public Access Systems" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N6 [label="Security of Holdings" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N7 [label="Legal and Ethical Compliance" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N8 [label="Records Transfer Processes" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N9 [label="Subject Indexing for Archives" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	S0 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Acquisition and Accessioning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Web Archiving" color="#673AB7" fillcolor="#D1C4E9" shape=oval style=filled]
+		nest0_1 [label="Provenance Tracking" color="#F7BEE0" fillcolor="#FAEBF3" shape=plaintext style=filled]
+		nest0_2 [label="Disaster Preparedness for Archives" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest0_3 [label="Conservation Treatment" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=publishes color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Records Management Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Digital Forensics for Archives" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest1_1 [label="Exhibition Curation" color="#BCB88A" fillcolor="#F5F5DC" shape=folder style=filled]
+		nest1_0 -> nest1_1 [label=disseminates color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=retrieves color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M2 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_297.txt b/test/graphviz/graph_hard/graphviz_297.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3173a9d989258044d20783e9d926d0693379d0df
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_297.txt
@@ -0,0 +1,28 @@
+<Accessibility Technology for Visitors, connectedTo, Predictive Maintenance for Tech>
+<Content Management Systems, connectedTo, Visitor Analytics>
+<Content Management Systems, partOf, Content Management Systems>
+<Database Management, connectedTo, Robotics in Exhibits>
+<Database Management, partOf, Database Management>
+<Member Management Systems, connectedTo, 3D Printing for Replicas>
+<Member Management Systems, connectedTo, Security Systems Integration>
+<Mobile App Development, connectedTo, Member Management Systems>
+<Multisensory Exhibits, connectedTo, Content Management Systems>
+<Multisensory Exhibits, partOf, Multisensory Exhibits>
+<Online Shop Integration, connectedTo, Predictive Maintenance for Tech>
+<Online Shop Integration, connectedTo, Wayfinding Systems>
+<Online Shop Integration, documents, Member Management Systems>
+<Online Shop Integration, notifies, Accessibility Technology for Visitors>
+<Predictive Maintenance for Tech, connectedTo, Wayfinding Systems>
+<Research Databases Access, connectedTo, Database Management>
+<Research Databases Access, connectedTo, Online Shop Integration>
+<Robotics in Exhibits, connectedTo, Member Management Systems>
+<Robotics in Exhibits, partOf, Robotics in Exhibits>
+<Security Systems Integration, connectedTo, Multisensory Exhibits>
+<Security Systems Integration, partOf, Security Systems Integration>
+<Ticketing and Visitor Systems, connectedTo, Accessibility Technology for Visitors>
+<Ticketing and Visitor Systems, connectedTo, Predictive Maintenance for Tech>
+<Ticketing and Visitor Systems, connectedTo, Research Databases Access>
+<Ticketing and Visitor Systems, connectedTo, Wayfinding Systems>
+<Visitor Analytics, connectedTo, Accessibility Technology for Visitors>
+<Visitor Analytics, partOf, Visitor Analytics>
+<Wayfinding Systems, entertains, Mobile App Development>
diff --git a/test/graphviz/graph_hard/graphviz_298.dot b/test/graphviz/graph_hard/graphviz_298.dot
new file mode 100644
index 0000000000000000000000000000000000000000..02d6e0a7984ed213bea23f854d0b3c5506e91f97
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_298.dot
@@ -0,0 +1,85 @@
+digraph {
+	rankdir=TD
+	N0 [label="Compliance Software Implementation" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N1 [label="Incident Response Planning" color="#673AB7" fillcolor="#D1C4E9" shape=oval style=filled]
+	N2 [label="Bias Mitigation" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N3 [label="Ethical Decision_Making Frameworks" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N4 [label="Reporting Mechanisms" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N5 [label="Data Privacy Compliance" color="#FFD54F" fillcolor="#FFF8E1" shape=diamond style=filled]
+	N6 [label="CSR Reporting" color="#FFD54F" fillcolor="#FFF8E1" shape=Mdiamond style=filled]
+	N7 [label="Monitoring and Enforcement" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N8 [label="Regulatory Interpretation" color="#607D8B" fillcolor="#CFD8DC" shape=diamond style=filled]
+	N9 [label="Ethical Leadership Development" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N10 [label="Corporate Governance Standards" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N11 [label="ESG Integration" color="#607D8B" fillcolor="#CFD8DC" shape=Mdiamond style=filled]
+	N12 [label="Conflict of Interest Management" color="#673AB7" fillcolor="#D1C4E9" shape=folder style=filled]
+	N13 [label="Financial Regulations Compliance" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N14 [label="Consumer Protection Compliance" color="#673AB7" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N15 [label="Code of Conduct Implementation" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N16 [label="Stakeholder Engagement on Ethics" color="#673AB7" fillcolor="#D1C4E9" shape=octagon style=filled]
+	N17 [label="Risk Assessment" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	S0 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Export Control Compliance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Third_Party Due Diligence" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+		nest0_1 [label="Ethical AI Guidelines" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+		nest0_2 [label="Anti_Money Laundering Compliance" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Product Safety Compliance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Environmental Compliance" color="#673AB7" fillcolor="#D1C4E9" shape=folder style=filled]
+		nest1_1 [label="Anti_Bribery and Corruption Compliance" color="#673AB7" fillcolor="#D1C4E9" shape=plaintext style=filled]
+		nest1_2 [label="Compliance Hotlines" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=procedures color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label=certifies color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [label=fairness color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest0_0 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N16 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [label=data color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [label=guides color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S2 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S2 -> N16 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=enforces color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label=educates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M2 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N13 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_299.dot b/test/graphviz/graph_hard/graphviz_299.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c33a097d42a74e68bcf241830eeca82c73c5b7c4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_299.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=LR
+	N0 [label="Export Control Compliance" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N1 [label="Policy Development" color="#EAEFA5" fillcolor="#FDFCEB" shape=hexagon style=filled]
+	N2 [label="Stakeholder Engagement on Ethics" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	N3 [label="Incident Response Planning" color="#EAEFA5" fillcolor="#FDFCEB" shape=hexagon style=filled]
+	N4 [label="Sanctions Compliance" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N5 [label="Compliance Training" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N6 [label="Environmental Compliance" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N7 [label="Third_Party Due Diligence" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N8 [label="Legal Advisory" color="#D2D2D2" fillcolor="#F0F0F0" shape=Mdiamond style=filled]
+	N9 [label="Supplier Code of Conduct" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N10 [label="Labor Law Compliance" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N11 [label="Product Safety Compliance" color="#A1D7CD" fillcolor="#EDF5F3" shape=Mdiamond style=filled]
+	N12 [label="Anti_Money Laundering Compliance" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	N13 [label="Monitoring and Enforcement" color="#D2D2D2" fillcolor="#F0F0F0" shape=Mdiamond style=filled]
+	N14 [label="Internal Investigations" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N15 [label="Transparent Communication" color="#D2D2D2" fillcolor="#F0F0F0" shape=hexagon style=filled]
+	N16 [label="Data Privacy Compliance" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	S0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Audit Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Information Security Compliance" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+		nest0_1 [label="Consumer Protection Compliance" color="#A1D7CD" fillcolor="#EDF5F3" shape=plaintext style=filled]
+		nest0_2 [label="Ethical Decision_Making Frameworks" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+		nest0_3 [label="Compliance Software Implementation" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Ethical AI Guidelines" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Ethics Committee Formation" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+		nest1_1 [label="Bias Mitigation" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest1_2 [label="ESG Integration" color="#D2D2D2" fillcolor="#F0F0F0" shape=oval style=filled]
+		nest1_3 [label="Compliance Hotlines" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [label=transparency color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=fairness color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=investigates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=consults color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [label=privacy color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N8 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N8 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [label=guides color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [label=respects color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N9 -> M2 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N8 -> M2 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	M2 -> N11 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_299.txt b/test/graphviz/graph_hard/graphviz_299.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6fce5edc554f1b2f0b7b6ea6fe8d1827ec6369b4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_299.txt
@@ -0,0 +1,44 @@
+<Anti_Money Laundering Compliance, connectedTo, Monitoring and Enforcement>
+<Bias Mitigation, fairness, ESG Integration>
+<Bias Mitigation, partOf, Bias Mitigation>
+<Compliance Hotlines, connectedTo, Legal Advisory>
+<Compliance Hotlines, partOf, Compliance Hotlines>
+<Compliance Software Implementation, connectedTo, Legal Advisory>
+<Compliance Software Implementation, partOf, Compliance Software Implementation>
+<Compliance Training, connectedTo, Environmental Compliance>
+<Consumer Protection Compliance, connectedTo, Ethical Decision_Making Frameworks>
+<Consumer Protection Compliance, partOf, Consumer Protection Compliance>
+<ESG Integration, connectedTo, Compliance Hotlines>
+<ESG Integration, partOf, ESG Integration>
+<Environmental Compliance, connectedTo, Third_Party Due Diligence>
+<Ethical Decision_Making Frameworks, connectedTo, Compliance Software Implementation>
+<Ethical Decision_Making Frameworks, partOf, Ethical Decision_Making Frameworks>
+<Ethics Committee Formation, partOf, Ethics Committee Formation>
+<Ethics Committee Formation, transparency, Bias Mitigation>
+<Export Control Compliance, connectedTo, Environmental Compliance>
+<Export Control Compliance, connectedTo, Incident Response Planning>
+<Export Control Compliance, connectedTo, Third_Party Due Diligence>
+<Export Control Compliance, investigates, Policy Development>
+<Incident Response Planning, connectedTo, Environmental Compliance>
+<Incident Response Planning, connectedTo, Legal Advisory>
+<Incident Response Planning, connectedTo, Sanctions Compliance>
+<Incident Response Planning, guides, Compliance Training>
+<Incident Response Planning, respects, Third_Party Due Diligence>
+<Information Security Compliance, connectedTo, Consumer Protection Compliance>
+<Information Security Compliance, partOf, Information Security Compliance>
+<Internal Investigations, connectedTo, Transparent Communication>
+<Labor Law Compliance, connectedTo, Product Safety Compliance>
+<Legal Advisory, connectedTo, Information Security Compliance>
+<Legal Advisory, connectedTo, Product Safety Compliance>
+<Legal Advisory, connectedTo, Supplier Code of Conduct>
+<Monitoring and Enforcement, connectedTo, Internal Investigations>
+<Policy Development, connectedTo, Ethics Committee Formation>
+<Policy Development, consults, Stakeholder Engagement on Ethics>
+<Product Safety Compliance, connectedTo, Anti_Money Laundering Compliance>
+<Sanctions Compliance, connectedTo, Compliance Training>
+<Sanctions Compliance, connectedTo, Third_Party Due Diligence>
+<Stakeholder Engagement on Ethics, connectedTo, Incident Response Planning>
+<Supplier Code of Conduct, connectedTo, Labor Law Compliance>
+<Supplier Code of Conduct, connectedTo, Product Safety Compliance>
+<Third_Party Due Diligence, connectedTo, Legal Advisory>
+<Transparent Communication, privacy, Data Privacy Compliance>
diff --git a/test/graphviz/graph_hard/graphviz_30.dot b/test/graphviz/graph_hard/graphviz_30.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fff147675a9dc32fadeac9314c76a24911f71d8c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_30.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=RL
+	N0 [label="Bill Generation" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N1 [label="Plan Suspension" color="#CDDC39" fillcolor="#E6EE9C" shape=octagon style=filled]
+	N2 [label="Mobile Top_up" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N3 [label="Technical Support Escalation" color="#4DD0E1" fillcolor="#C9F0F0" shape=oval style=filled]
+	N4 [label="Base Station Installation" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N5 [label="Service Activation Request" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N6 [label="Billing Inquiry" color="#4DD0E1" fillcolor="#C9F0F0" shape=octagon style=filled]
+	N7 [label="Outage Detection" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N8 [label="Number Porting" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N9 [label="Network Activation" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	S0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Usage Monitoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Broadband Provisioning" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest0_1 [label="SIM Registration" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+		nest0_2 [label="Network Upgrade" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+		nest0_3 [label="Fiber Optic Deployment" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Spectrum Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Video Conferencing" color="#CDDC39" fillcolor="#E6EE9C" shape=Mdiamond style=filled]
+		nest1_1 [label="Customer Relationship Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=folder style=filled]
+		nest1_2 [label="Roaming Activation" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N3 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	S1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_30.txt b/test/graphviz/graph_hard/graphviz_30.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f7b9885dcd38d759f9b57960f381c427103d0c38
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_30.txt
@@ -0,0 +1,31 @@
+<Base Station Installation, connectedTo, Service Activation Request>
+<Bill Generation, connectedTo, Number Porting>
+<Bill Generation, connectedTo, Outage Detection>
+<Bill Generation, connectedTo, Plan Suspension>
+<Bill Generation, connectedTo, Technical Support Escalation>
+<Billing Inquiry, connectedTo, Outage Detection>
+<Broadband Provisioning, connectedTo, SIM Registration>
+<Broadband Provisioning, partOf, Broadband Provisioning>
+<Customer Relationship Management, connectedTo, Roaming Activation>
+<Customer Relationship Management, partOf, Customer Relationship Management>
+<Fiber Optic Deployment, connectedTo, Technical Support Escalation>
+<Fiber Optic Deployment, partOf, Fiber Optic Deployment>
+<Mobile Top_up, connectedTo, Technical Support Escalation>
+<Network Upgrade, connectedTo, Fiber Optic Deployment>
+<Network Upgrade, partOf, Network Upgrade>
+<Number Porting, connectedTo, Network Activation>
+<Number Porting, connectedTo, Video Conferencing>
+<Outage Detection, connectedTo, Number Porting>
+<Plan Suspension, connectedTo, Mobile Top_up>
+<Plan Suspension, connectedTo, Technical Support Escalation>
+<Roaming Activation, connectedTo, Number Porting>
+<Roaming Activation, partOf, Roaming Activation>
+<SIM Registration, connectedTo, Network Upgrade>
+<SIM Registration, partOf, SIM Registration>
+<Service Activation Request, connectedTo, Billing Inquiry>
+<Service Activation Request, connectedTo, Broadband Provisioning>
+<Service Activation Request, connectedTo, Number Porting>
+<Service Activation Request, connectedTo, Outage Detection>
+<Technical Support Escalation, connectedTo, Base Station Installation>
+<Video Conferencing, connectedTo, Customer Relationship Management>
+<Video Conferencing, partOf, Video Conferencing>
diff --git a/test/graphviz/graph_hard/graphviz_300.txt b/test/graphviz/graph_hard/graphviz_300.txt
new file mode 100644
index 0000000000000000000000000000000000000000..35c77f856585bb274463b117a858061cd3d49895
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_300.txt
@@ -0,0 +1,39 @@
+<CSR Reporting, connectedTo, Ethical Decision_Making Frameworks>
+<CSR Reporting, connectedTo, Product Safety Compliance>
+<CSR Reporting, connectedTo, Stakeholder Engagement on Ethics>
+<CSR Reporting, privacy, Third_Party Due Diligence>
+<Code of Conduct Implementation, connectedTo, Ethical Decision_Making Frameworks>
+<Code of Conduct Implementation, connectedTo, Internal Investigations>
+<Code of Conduct Implementation, connectedTo, Stakeholder Engagement on Ethics>
+<Code of Conduct Implementation, reviews, Data Ethics>
+<Consumer Protection Compliance, connectedTo, CSR Reporting>
+<Consumer Protection Compliance, secures, Ethics Committee Formation>
+<Corporate Governance Standards, connectedTo, Code of Conduct Implementation>
+<Corporate Governance Standards, partOf, Corporate Governance Standards>
+<Data Ethics, connectedTo, Sanctions Compliance>
+<Data Ethics, partOf, Data Ethics>
+<Data Privacy Compliance, connectedTo, Fair Competition Compliance>
+<Data Privacy Compliance, partOf, Data Privacy Compliance>
+<Ethical AI Guidelines, connectedTo, Ethics Committee Formation>
+<Ethical AI Guidelines, partOf, Ethical AI Guidelines>
+<Ethical Decision_Making Frameworks, connectedTo, Internal Investigations>
+<Ethical Leadership Development, connectedTo, Data Privacy Compliance>
+<Ethical Leadership Development, connectedTo, Product Safety Compliance>
+<Ethics Committee Formation, connectedTo, CSR Reporting>
+<Ethics Committee Formation, connectedTo, Information Security Compliance>
+<Ethics Committee Formation, connectedTo, Internal Investigations>
+<Fair Competition Compliance, connectedTo, Corporate Governance Standards>
+<Fair Competition Compliance, partOf, Fair Competition Compliance>
+<Information Security Compliance, connectedTo, CSR Reporting>
+<Information Security Compliance, connectedTo, Ethical Decision_Making Frameworks>
+<Internal Investigations, connectedTo, Ethical Leadership Development>
+<Legal Advisory, connectedTo, Code of Conduct Implementation>
+<Legal Advisory, connectedTo, Internal Investigations>
+<Regulatory Interpretation, connectedTo, Ethical AI Guidelines>
+<Regulatory Interpretation, partOf, Regulatory Interpretation>
+<Sanctions Compliance, connectedTo, Regulatory Interpretation>
+<Sanctions Compliance, partOf, Sanctions Compliance>
+<Stakeholder Engagement on Ethics, connectedTo, Ethical Decision_Making Frameworks>
+<Third_Party Due Diligence, connectedTo, Ethical Decision_Making Frameworks>
+<Third_Party Due Diligence, connectedTo, Legal Advisory>
+<Third_Party Due Diligence, connectedTo, Product Safety Compliance>
diff --git a/test/graphviz/graph_hard/graphviz_302.dot b/test/graphviz/graph_hard/graphviz_302.dot
new file mode 100644
index 0000000000000000000000000000000000000000..55afe0cec552c09f45ae5893ff9318e76c852ae4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_302.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=RL
+	N0 [label="Document Examination" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N1 [label="Data Recovery" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N2 [label="Forensic Photography" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	N3 [label="Cold Case Review" color="#E57373" fillcolor="#FFEBEE" shape=plaintext style=filled]
+	N4 [label="Crime Database Search" color="#B8C0F5" fillcolor="#ECF0FD" shape=octagon style=filled]
+	N5 [label="Forensic Entomology" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N6 [label="Voice Recognition" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N7 [label="Mobile Device Forensics" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N8 [label="Toxicology Testing" color="#E57373" fillcolor="#FFEBEE" shape=plaintext style=filled]
+	N9 [label="Laboratory Analysis" color="#90A4AE" fillcolor="#ECEFF1" shape=Mdiamond style=filled]
+	N10 [label="Vehicle Forensics" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N11 [label="Malware Analysis" color="#E57373" fillcolor="#FFEBEE" shape=parallelogram style=filled]
+	N12 [label="Evidence Preservation" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	S0 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Forensic Botany" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cyber Crime Investigation" color="#E57373" fillcolor="#FFEBEE" shape=parallelogram style=filled]
+		nest0_1 [label="Chain of Custody Management" color="#B8C0F5" fillcolor="#ECF0FD" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Handwriting Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Facial Recognition" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+		nest1_1 [label="Cloud Forensics" color="#90A4AE" fillcolor="#ECEFF1" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=compares color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest0_0 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [label=fingerprints color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N1 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N9 -> S0 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N2 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_303.dot b/test/graphviz/graph_hard/graphviz_303.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9cdc669fba274be7b3793eb02ca4041421a917da
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_303.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=BT
+	N0 [label="Facial Recognition" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N1 [label="Bloodstain Pattern Analysis" color="#B8C0F5" fillcolor="#ECF0FD" shape=octagon style=filled]
+	N2 [label="Crime Database Search" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N3 [label="Legal Standards Compliance" color="#B8C0F5" fillcolor="#ECF0FD" shape=oval style=filled]
+	N4 [label="Cloud Forensics" color="#4FC3F7" fillcolor="#E1F5FE" shape=plaintext style=filled]
+	N5 [label="Cyber Crime Investigation" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N6 [label="Handwriting Analysis" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N7 [label="Evidence Collection" color="#B8C0F5" fillcolor="#ECF0FD" shape=diamond style=filled]
+	N8 [label="Chain of Custody Management" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N9 [label="Network Forensics" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N10 [label="Forensic Anthropology" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N11 [label="Forensic Psychology" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N12 [label="Data Recovery" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N13 [label="Forensic Odontology" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	S0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4FC3F7" fillcolor="#E1F5FE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Forensic Entomology" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Laboratory Analysis" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+		nest0_1 [label="Forensic Botany" color="#B8C0F5" fillcolor="#ECF0FD" shape=octagon style=filled]
+		nest0_2 [label="Mobile Device Forensics" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+		nest0_3 [label="Forensic Interviewing" color="#B8C0F5" fillcolor="#ECF0FD" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Toxicology Testing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Trace Evidence Analysis" color="#4FC3F7" fillcolor="#E1F5FE" shape=plaintext style=filled]
+		nest1_1 [label="Vehicle Forensics" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+		nest1_2 [label="Arson Investigation" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+		nest1_0 -> nest1_1 [label=toxicology color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=detects color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [label=analyzes color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N10 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [label=advises color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N13 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N10 -> S0 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [label=DNA_profiles color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [label=crime_scenes color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [label=researches color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_304.dot b/test/graphviz/graph_hard/graphviz_304.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9a1c775fc66e152a80b0058ddfb101fd0169a66f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_304.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=TD
+	N0 [label="Transportation Security" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N1 [label="Post_Incident Recovery" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N2 [label="Port Security" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N3 [label="Insider Threat Programs" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N4 [label="Law Enforcement Operations" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N5 [label="International Cooperation" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N6 [label="Drone Countermeasures" color="#A188DB" fillcolor="#DED7F0" shape=diamond style=filled]
+	N7 [label="Forensic Investigation of Attacks" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N8 [label="Homeland Security Planning" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N9 [label="Chemical Biological Radiological Nuclear Defense" color="#7986CB" fillcolor="#E8EAF6" shape=folder style=filled]
+	N10 [label="Radicalization Prevention" color="#A188DB" fillcolor="#DED7F0" shape=parallelogram style=filled]
+	N11 [label="Terrorism Financing Interdiction" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+	N12 [label="Fusion Center Operations" color="#A188DB" fillcolor="#DED7F0" shape=folder style=filled]
+	N13 [label="Emergency Preparedness" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	S0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Military Counterterrorism" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Bomb Disposal" color="#7986CB" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+		nest0_1 [label="Legislation and Policy Development" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Psychological Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Training Exercises" color="#A188DB" fillcolor="#DED7F0" shape=diamond style=filled]
+		nest1_1 [label="Threat Assessment" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+		nest1_2 [label="Border Security" color="#7986CB" fillcolor="#E8EAF6" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=detects color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N12 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest1_0 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N6 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S0 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [label=trains color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [label=vulnerabilities_reduces color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M2 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N9 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_304.txt b/test/graphviz/graph_hard/graphviz_304.txt
new file mode 100644
index 0000000000000000000000000000000000000000..95c2e56982ed2022a7e9ccf14fa1d9b9e57ce272
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_304.txt
@@ -0,0 +1,36 @@
+<Bomb Disposal, connectedTo, Legislation and Policy Development>
+<Bomb Disposal, partOf, Bomb Disposal>
+<Border Security, connectedTo, Drone Countermeasures>
+<Border Security, partOf, Border Security>
+<Chemical Biological Radiological Nuclear Defense, connectedTo, Radicalization Prevention>
+<Drone Countermeasures, connectedTo, Forensic Investigation of Attacks>
+<Forensic Investigation of Attacks, connectedTo, Chemical Biological Radiological Nuclear Defense>
+<Forensic Investigation of Attacks, connectedTo, Homeland Security Planning>
+<Fusion Center Operations, connectedTo, Emergency Preparedness>
+<Fusion Center Operations, connectedTo, Training Exercises>
+<Homeland Security Planning, connectedTo, Chemical Biological Radiological Nuclear Defense>
+<Insider Threat Programs, connectedTo, Forensic Investigation of Attacks>
+<Insider Threat Programs, connectedTo, Homeland Security Planning>
+<Insider Threat Programs, connectedTo, Law Enforcement Operations>
+<International Cooperation, detects, Drone Countermeasures>
+<Law Enforcement Operations, connectedTo, International Cooperation>
+<Legislation and Policy Development, connectedTo, Fusion Center Operations>
+<Legislation and Policy Development, partOf, Legislation and Policy Development>
+<Port Security, connectedTo, Chemical Biological Radiological Nuclear Defense>
+<Port Security, connectedTo, Insider Threat Programs>
+<Port Security, connectedTo, Law Enforcement Operations>
+<Post_Incident Recovery, connectedTo, Bomb Disposal>
+<Post_Incident Recovery, connectedTo, Drone Countermeasures>
+<Post_Incident Recovery, connectedTo, Port Security>
+<Post_Incident Recovery, vulnerabilities_reduces, Law Enforcement Operations>
+<Radicalization Prevention, connectedTo, Fusion Center Operations>
+<Radicalization Prevention, connectedTo, Terrorism Financing Interdiction>
+<Radicalization Prevention, trains, Emergency Preparedness>
+<Terrorism Financing Interdiction, connectedTo, Fusion Center Operations>
+<Threat Assessment, connectedTo, Border Security>
+<Threat Assessment, partOf, Threat Assessment>
+<Training Exercises, connectedTo, Threat Assessment>
+<Training Exercises, partOf, Training Exercises>
+<Transportation Security, connectedTo, Drone Countermeasures>
+<Transportation Security, connectedTo, Law Enforcement Operations>
+<Transportation Security, connectedTo, Post_Incident Recovery>
diff --git a/test/graphviz/graph_hard/graphviz_305.dot b/test/graphviz/graph_hard/graphviz_305.dot
new file mode 100644
index 0000000000000000000000000000000000000000..067534e663c2f74c10ae79495fae57d8a27d7471
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_305.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=RL
+	N0 [label="Intelligence Analysis" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Threat Assessment" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N2 [label="Psychological Operations" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N3 [label="International Cooperation" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N4 [label="Insider Threat Programs" color="#FFB74D" fillcolor="#FFF3E0" shape=octagon style=filled]
+	N5 [label="Airport Security" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N6 [label="Risk_Based Security Measures" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N7 [label="Crisis Response Planning" color="#FFB74D" fillcolor="#FFF3E0" shape=Mdiamond style=filled]
+	N8 [label="Military Counterterrorism" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N9 [label="Port Security" color="#9575CD" fillcolor="#EDE7F6" shape=folder style=filled]
+	N10 [label="Biometric Screening" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N11 [label="Transportation Security" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N12 [label="Public Awareness Campaigns" color="#9575CD" fillcolor="#EDE7F6" shape=folder style=filled]
+	N13 [label="Post_Incident Recovery" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N14 [label="Risk Analysis" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	S1 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Drone Countermeasures" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Bomb Disposal" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_1 [label=Counter_Propaganda color="#9575CD" fillcolor="#EDE7F6" shape=oval style=filled]
+		nest0_2 [label="Behavioral Threat Assessment" color="#FFB74D" fillcolor="#FFF3E0" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_1 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Fusion Center Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Homeland Security Planning" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+		nest1_1 [label="Terrorism Financing Interdiction" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=technologies_applies color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest0_0 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N8 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [label=vulnerabilities_reduces color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest1_0 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N3 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_306.dot b/test/graphviz/graph_hard/graphviz_306.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cb46330aa5c08806a5d06d2df653ee3f3071f60f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_306.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=RL
+	N0 [label="Terrorism Financing Interdiction" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N1 [label="Intelligence Analysis" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N2 [label="Forensic Investigation of Attacks" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N3 [label="Border Security" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N4 [label="Risk_Based Security Measures" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N5 [label="Information Sharing" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N6 [label="Data Analytics for Terrorism" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N7 [label="Bomb Disposal" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N8 [label="Crisis Response Planning" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N9 [label="Threat Assessment" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N10 [label="International Cooperation" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N11 [label=Counter_Propaganda color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N12 [label="Radicalization Prevention" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N13 [label="Training Exercises" color="#C2B2F0" fillcolor="#EFE6FF" shape=plaintext style=filled]
+	N14 [label="Port Security" color="#94C0C0" fillcolor="#CADEDE" shape=Mdiamond style=filled]
+	N15 [label="Public Awareness Campaigns" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+	N16 [label="Drone Countermeasures" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N17 [label="Legislation and Policy Development" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	S0 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Intelligence Gathering" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Post_Incident Recovery" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+		nest0_1 [label="Military Counterterrorism" color="#94C0C0" fillcolor="#CADEDE" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Risk Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Vulnerability Assessment" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+		nest1_1 [label="Hostage Negotiation" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+		nest1_2 [label="Airport Security" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest1_3 [label="Surveillance and Monitoring" color="#F44336" fillcolor="#FFCDD2" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=incidents_responds color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=investigates color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=propaganda_counters color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N10 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [label=vulnerabilities_reduces color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> M1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N10 -> M1 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N16 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N4 -> M2 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	M2 -> N8 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_306.txt b/test/graphviz/graph_hard/graphviz_306.txt
new file mode 100644
index 0000000000000000000000000000000000000000..04c90f31932ca4b242a2646b4de2718ba7c2e2f1
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_306.txt
@@ -0,0 +1,44 @@
+<Airport Security, connectedTo, Surveillance and Monitoring>
+<Airport Security, partOf, Airport Security>
+<Bomb Disposal, connectedTo, Crisis Response Planning>
+<Bomb Disposal, connectedTo, Drone Countermeasures>
+<Bomb Disposal, connectedTo, International Cooperation>
+<Bomb Disposal, connectedTo, Legislation and Policy Development>
+<Bomb Disposal, connectedTo, Vulnerability Assessment>
+<Bomb Disposal, vulnerabilities_reduces, Port Security>
+<Border Security, connectedTo, Crisis Response Planning>
+<Border Security, connectedTo, Drone Countermeasures>
+<Border Security, connectedTo, Risk_Based Security Measures>
+<Counter_Propaganda, connectedTo, Drone Countermeasures>
+<Counter_Propaganda, connectedTo, Radicalization Prevention>
+<Crisis Response Planning, connectedTo, Threat Assessment>
+<Data Analytics for Terrorism, connectedTo, Bomb Disposal>
+<Drone Countermeasures, connectedTo, Legislation and Policy Development>
+<Forensic Investigation of Attacks, connectedTo, Post_Incident Recovery>
+<Forensic Investigation of Attacks, incidents_responds, Border Security>
+<Hostage Negotiation, connectedTo, Airport Security>
+<Hostage Negotiation, partOf, Hostage Negotiation>
+<Information Sharing, connectedTo, Crisis Response Planning>
+<Information Sharing, investigates, Data Analytics for Terrorism>
+<Intelligence Analysis, connectedTo, Drone Countermeasures>
+<Intelligence Analysis, connectedTo, Forensic Investigation of Attacks>
+<International Cooperation, connectedTo, Drone Countermeasures>
+<International Cooperation, propaganda_counters, Counter_Propaganda>
+<Military Counterterrorism, connectedTo, Border Security>
+<Military Counterterrorism, partOf, Military Counterterrorism>
+<Port Security, connectedTo, Public Awareness Campaigns>
+<Post_Incident Recovery, connectedTo, Military Counterterrorism>
+<Post_Incident Recovery, partOf, Post_Incident Recovery>
+<Public Awareness Campaigns, connectedTo, Drone Countermeasures>
+<Radicalization Prevention, connectedTo, Training Exercises>
+<Risk_Based Security Measures, connectedTo, Crisis Response Planning>
+<Risk_Based Security Measures, connectedTo, Information Sharing>
+<Surveillance and Monitoring, connectedTo, International Cooperation>
+<Surveillance and Monitoring, partOf, Surveillance and Monitoring>
+<Terrorism Financing Interdiction, connectedTo, Intelligence Analysis>
+<Threat Assessment, connectedTo, International Cooperation>
+<Training Exercises, connectedTo, Legislation and Policy Development>
+<Training Exercises, connectedTo, Port Security>
+<Training Exercises, connectedTo, Public Awareness Campaigns>
+<Vulnerability Assessment, connectedTo, Hostage Negotiation>
+<Vulnerability Assessment, partOf, Vulnerability Assessment>
diff --git a/test/graphviz/graph_hard/graphviz_307.txt b/test/graphviz/graph_hard/graphviz_307.txt
new file mode 100644
index 0000000000000000000000000000000000000000..88a51121636bd9ae9f50a4b1fcc8605d31aaca35
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_307.txt
@@ -0,0 +1,32 @@
+<Anomaly Detection, connectedTo, Night Vision Technology>
+<Automated Threat Detection, connectedTo, Physical Security Integration>
+<Automated Threat Detection, partOf, Automated Threat Detection>
+<Biometric Data Analysis, connectedTo, Automated Threat Detection>
+<Biometric Data Analysis, partOf, Biometric Data Analysis>
+<CCTV Monitoring, partOf, CCTV Monitoring>
+<CCTV Monitoring, records, Data Storage and Retention>
+<Cyber Surveillance, connectedTo, GPS Tracking>
+<Cyber Surveillance, partOf, Cyber Surveillance>
+<Data Storage and Retention, connectedTo, Drone Surveillance>
+<Data Storage and Retention, partOf, Data Storage and Retention>
+<Drone Surveillance, installs, Cyber Surveillance>
+<Drone Surveillance, partOf, Drone Surveillance>
+<Environmental Monitoring, connectedTo, GPS Tracking>
+<Environmental Monitoring, connectedTo, Physical Security Integration>
+<GPS Tracking, connectedTo, Network Monitoring>
+<Internet Traffic Monitoring, connectedTo, Anomaly Detection>
+<Internet Traffic Monitoring, connectedTo, Biometric Data Analysis>
+<Internet Traffic Monitoring, connectedTo, CCTV Monitoring>
+<Network Monitoring, connectedTo, Anomaly Detection>
+<Network Monitoring, connectedTo, Asset Tracking>
+<Network Monitoring, connectedTo, Internet Traffic Monitoring>
+<Network Monitoring, connectedTo, Real_time Alerts>
+<Night Vision Technology, connectedTo, Asset Tracking>
+<Night Vision Technology, connectedTo, Traffic Surveillance>
+<Physical Security Integration, connectedTo, GPS Tracking>
+<Physical Security Integration, connectedTo, Sensor Network Deployment>
+<Physical Security Integration, verifies, Anomaly Detection>
+<Real_time Alerts, connectedTo, Asset Tracking>
+<Real_time Alerts, connectedTo, Internet Traffic Monitoring>
+<Sensor Network Deployment, connectedTo, GPS Tracking>
+<Traffic Surveillance, tracks, Asset Tracking>
diff --git a/test/graphviz/graph_hard/graphviz_31.dot b/test/graphviz/graph_hard/graphviz_31.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ff5dfc8bca864840f970987c40e7f446ea649a6d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_31.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=RL
+	N0 [label="Barn Cleaning" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N1 [label="Greenhouse Control" color="#7E57C2" fillcolor="#EDE7F6" shape=oval style=filled]
+	N2 [label="Weed Removal" color="#7E57C2" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N3 [label="Aquaculture Farming" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N4 [label="Subsidy Application" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N5 [label="Crop Monitoring" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N6 [label="Forestry Management" color="#7E57C2" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N7 [label=Harvesting color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N8 [label="Food Processing" color="#7E57C2" fillcolor="#EDE7F6" shape=octagon style=filled]
+	N9 [label="Produce Sorting" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	S0 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Farm Machinery Operation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Animal Health Monitoring" color="#7E57C2" fillcolor="#EDE7F6" shape=folder style=filled]
+		nest0_1 [label="Farm Maintenance" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+		nest0_2 [label="Seed Sowing" color="#7E57C2" fillcolor="#EDE7F6" shape=octagon style=filled]
+		nest0_3 [label="Yield Prediction" color="#7E57C2" fillcolor="#EDE7F6" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [label=sensors color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Fertilizer Application" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Fencing Installation" color="#7E57C2" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+		nest1_1 [label="Irrigation Scheduling" color="#7E57C2" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+		nest1_2 [label="Weather Tracking" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N3 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [label=monitors color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N4 -> M2 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N6 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_310.txt b/test/graphviz/graph_hard/graphviz_310.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a84ced0b282caf86d3c03058a234892f5007c5c3
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_310.txt
@@ -0,0 +1,36 @@
+<Conflict Resolution Training, connectedTo, Environmental Design>
+<Crime Data Analysis, connectedTo, Drug Prevention Initiatives>
+<Crime Data Analysis, connectedTo, Environmental Design>
+<Crime Data Analysis, connectedTo, School Safety Programs>
+<Crisis Intervention, connectedTo, Cybercrime Prevention>
+<Crisis Intervention, connectedTo, Identity Theft Prevention>
+<Crisis Intervention, connectedTo, Police_Community Relations>
+<Crisis Intervention, connectedTo, Situational Crime Prevention>
+<Cybercrime Prevention, connectedTo, Conflict Resolution Training>
+<Deterrence Strategies, connectedTo, Policy Development for Prevention>
+<Deterrence Strategies, partOf, Deterrence Strategies>
+<Domestic Violence Prevention, connectedTo, Police_Community Relations>
+<Domestic Violence Prevention, connectedTo, Reintegration Programs>
+<Drug Prevention Initiatives, connectedTo, Crisis Intervention>
+<Drug Prevention Initiatives, connectedTo, Cybercrime Prevention>
+<Drug Prevention Initiatives, connectedTo, Police_Community Relations>
+<Drug Prevention Initiatives, hotspots, School Safety Programs>
+<Identity Theft Prevention, connectedTo, School Safety Programs>
+<Identity Theft Prevention, reports, Security Lighting>
+<Police_Community Relations, connectedTo, Cybercrime Prevention>
+<Policy Development for Prevention, connectedTo, School Safety Programs>
+<Policy Development for Prevention, partOf, Policy Development for Prevention>
+<Public Awareness Campaigns, connectedTo, Conflict Resolution Training>
+<Public Awareness Campaigns, partOf, Public Awareness Campaigns>
+<Reintegration Programs, connectedTo, Crime Data Analysis>
+<Reintegration Programs, connectedTo, Cybercrime Prevention>
+<Reintegration Programs, connectedTo, Identity Theft Prevention>
+<Reintegration Programs, connectedTo, School Safety Programs>
+<Reintegration Programs, prevents, Police_Community Relations>
+<School Safety Programs, connectedTo, Police_Community Relations>
+<Security Lighting, connectedTo, Deterrence Strategies>
+<Security Lighting, partOf, Security Lighting>
+<Situational Crime Prevention, connectedTo, Technology for Prevention>
+<Situational Crime Prevention, partOf, Situational Crime Prevention>
+<Technology for Prevention, connectedTo, Public Awareness Campaigns>
+<Technology for Prevention, partOf, Technology for Prevention>
diff --git a/test/graphviz/graph_hard/graphviz_313.dot b/test/graphviz/graph_hard/graphviz_313.dot
new file mode 100644
index 0000000000000000000000000000000000000000..70f425285cac90cc5d2ebd70fa2cda3eef3a0c57
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_313.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=BT
+	N0 [label="Research and Development in Conservation" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N1 [label="Ecosystem Services Valuation" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N2 [label="Carbon Sequestration in Habitats" color="#4CAF50" fillcolor="#C8E6C9" shape=Mdiamond style=filled]
+	N3 [label="Policy Advocacy" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N4 [label="Ecological Survey" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N5 [label="Population Dynamics Study" color="#7E57C2" fillcolor="#D1C4E9" shape=folder style=filled]
+	N6 [label="Genetic Diversity Analysis" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N7 [label="Law Enforcement" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N8 [label="Habitat Restoration" color="#CFCFCF" fillcolor="#F6F6F6" shape=octagon style=filled]
+	N9 [label="Species Monitoring" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+	N10 [label="Data Management for Conservation" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N11 [label="Anti_Poaching Operations" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N12 [label="Disease Surveillance" color="#7E57C2" fillcolor="#D1C4E9" shape=folder style=filled]
+	N13 [label="Camera Trap Deployment" color="#4CAF50" fillcolor="#C8E6C9" shape=diamond style=filled]
+	N14 [label="Freshwater Conservation" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Translocation of Species" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Conservation Genetics" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+		nest0_1 [label="Protected Area Management" color="#4CAF50" fillcolor="#C8E6C9" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Sustainable Resource Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Conservation Education" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+		nest1_1 [label="Fundraising for Conservation" color="#7E57C2" fillcolor="#D1C4E9" shape=folder style=filled]
+		nest1_2 [label="International Treaties Enforcement" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+		nest1_3 [label="Rewilding Initiatives" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=studies color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=reports color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [label=policies_influences color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N9 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S0 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [label=manages color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [label=restores color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [label=tracks_animals color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=conserves color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_313.txt b/test/graphviz/graph_hard/graphviz_313.txt
new file mode 100644
index 0000000000000000000000000000000000000000..197ef8332e011dc4af1c8dd917839cedb994c7c9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_313.txt
@@ -0,0 +1,39 @@
+<Anti_Poaching Operations, connectedTo, Disease Surveillance>
+<Camera Trap Deployment, policies_influences, Freshwater Conservation>
+<Carbon Sequestration in Habitats, connectedTo, Policy Advocacy>
+<Conservation Education, connectedTo, Fundraising for Conservation>
+<Conservation Education, partOf, Conservation Education>
+<Conservation Genetics, connectedTo, Protected Area Management>
+<Conservation Genetics, partOf, Conservation Genetics>
+<Data Management for Conservation, connectedTo, Anti_Poaching Operations>
+<Disease Surveillance, connectedTo, Camera Trap Deployment>
+<Ecological Survey, connectedTo, Anti_Poaching Operations>
+<Ecological Survey, connectedTo, Genetic Diversity Analysis>
+<Ecological Survey, connectedTo, Habitat Restoration>
+<Ecological Survey, connectedTo, Population Dynamics Study>
+<Ecological Survey, tracks_animals, Habitat Restoration>
+<Ecosystem Services Valuation, studies, Carbon Sequestration in Habitats>
+<Fundraising for Conservation, connectedTo, International Treaties Enforcement>
+<Fundraising for Conservation, partOf, Fundraising for Conservation>
+<Genetic Diversity Analysis, reports, Law Enforcement>
+<Habitat Restoration, connectedTo, Data Management for Conservation>
+<Habitat Restoration, connectedTo, Species Monitoring>
+<Habitat Restoration, manages, Anti_Poaching Operations>
+<Habitat Restoration, restores, Camera Trap Deployment>
+<International Treaties Enforcement, connectedTo, Rewilding Initiatives>
+<International Treaties Enforcement, partOf, International Treaties Enforcement>
+<Law Enforcement, connectedTo, Habitat Restoration>
+<Policy Advocacy, connectedTo, Conservation Genetics>
+<Policy Advocacy, connectedTo, Ecological Survey>
+<Population Dynamics Study, connectedTo, Genetic Diversity Analysis>
+<Protected Area Management, connectedTo, Species Monitoring>
+<Protected Area Management, partOf, Protected Area Management>
+<Research and Development in Conservation, connectedTo, Ecosystem Services Valuation>
+<Research and Development in Conservation, conserves, Habitat Restoration>
+<Rewilding Initiatives, connectedTo, Freshwater Conservation>
+<Rewilding Initiatives, partOf, Rewilding Initiatives>
+<Species Monitoring, connectedTo, Anti_Poaching Operations>
+<Species Monitoring, connectedTo, Camera Trap Deployment>
+<Species Monitoring, connectedTo, Conservation Education>
+<Species Monitoring, connectedTo, Data Management for Conservation>
+<Species Monitoring, connectedTo, Freshwater Conservation>
diff --git a/test/graphviz/graph_hard/graphviz_314.txt b/test/graphviz/graph_hard/graphviz_314.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7a82bd22835da4a981579bdbd2f47558092039ed
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_314.txt
@@ -0,0 +1,42 @@
+<Carbon Sequestration in Habitats, connectedTo, Wildlife Rescue and Rehabilitation>
+<Community Engagement, connectedTo, Rewilding Initiatives>
+<Data Management for Conservation, connectedTo, Genetic Diversity Analysis>
+<Ecological Survey, connectedTo, Invasive Species Control>
+<Ecosystem Services Valuation, connectedTo, Conservation Education>
+<Ecosystem Services Valuation, connectedTo, Reintroduction Programs>
+<Ecosystem Services Valuation, connectedTo, Satellite Tracking of Animals>
+<Ecosystem Services Valuation, connectedTo, Wetland Restoration>
+<Freshwater Conservation, connectedTo, Rewilding Initiatives>
+<Freshwater Conservation, partOf, Freshwater Conservation>
+<Fundraising for Conservation, connectedTo, Conservation Education>
+<Fundraising for Conservation, connectedTo, Ecosystem Services Valuation>
+<Fundraising for Conservation, connectedTo, Genetic Diversity Analysis>
+<Fundraising for Conservation, connectedTo, Species Monitoring>
+<Genetic Diversity Analysis, connectedTo, Community Engagement>
+<Genetic Diversity Analysis, manages, Rewilding Initiatives>
+<Human_Wildlife Conflict Mitigation, connectedTo, Freshwater Conservation>
+<Human_Wildlife Conflict Mitigation, partOf, Human_Wildlife Conflict Mitigation>
+<Invasive Species Control, community_engages, Remote Sensing for Conservation>
+<Law Enforcement, connectedTo, Sustainable Resource Management>
+<Law Enforcement, partOf, Law Enforcement>
+<Marine Conservation, sustainable_uses, Fundraising for Conservation>
+<Pollution Impact Assessment, connectedTo, Translocation of Species>
+<Pollution Impact Assessment, partOf, Pollution Impact Assessment>
+<Reintroduction Programs, connectedTo, Conservation Education>
+<Remote Sensing for Conservation, connectedTo, Ecosystem Services Valuation>
+<Rewilding Initiatives, connectedTo, Ecological Survey>
+<Rewilding Initiatives, connectedTo, Pollution Impact Assessment>
+<Rewilding Initiatives, connectedTo, Reintroduction Programs>
+<Rewilding Initiatives, connectedTo, Remote Sensing for Conservation>
+<Satellite Tracking of Animals, connectedTo, Human_Wildlife Conflict Mitigation>
+<Satellite Tracking of Animals, partOf, Satellite Tracking of Animals>
+<Species Monitoring, connectedTo, Data Management for Conservation>
+<Species Monitoring, connectedTo, Genetic Diversity Analysis>
+<Species Monitoring, connectedTo, Rewilding Initiatives>
+<Sustainable Resource Management, connectedTo, Data Management for Conservation>
+<Sustainable Resource Management, partOf, Sustainable Resource Management>
+<Translocation of Species, connectedTo, Law Enforcement>
+<Translocation of Species, partOf, Translocation of Species>
+<Wetland Restoration, connectedTo, Reintroduction Programs>
+<Wildlife Rescue and Rehabilitation, connectedTo, Marine Conservation>
+<Wildlife Rescue and Rehabilitation, studies, Rewilding Initiatives>
diff --git a/test/graphviz/graph_hard/graphviz_315.dot b/test/graphviz/graph_hard/graphviz_315.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b36b08bb387ee8e919a048f6cfd9cd7eb33ff97b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_315.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=LR
+	N0 [label="Pollution Impact Assessment" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label="Policy Advocacy" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N2 [label="Translocation of Species" color="#FFC2C2" fillcolor="#FFEBEB" shape=folder style=filled]
+	N3 [label="Captive Breeding Programs" color="#FFC2C2" fillcolor="#FFEBEB" shape=octagon style=filled]
+	N4 [label="Ecological Survey" color="#FFC2C2" fillcolor="#FFEBEB" shape=parallelogram style=filled]
+	N5 [label="Ecotourism Management" color="#FFC2C2" fillcolor="#FFEBEB" shape=Mdiamond style=filled]
+	N6 [label="Population Dynamics Study" color="#92C79A" fillcolor="#E8F0EA" shape=Mdiamond style=filled]
+	N7 [label="Invasive Species Control" color="#FFC2C2" fillcolor="#FFEBEB" shape=Mdiamond style=filled]
+	N8 [label="Conservation Genetics" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N9 [label="Ecosystem Services Valuation" color="#607D8B" fillcolor="#CFD8DC" shape=Mdiamond style=filled]
+	N10 [label="Climate Change Adaptation for Wildlife" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N11 [label="Research and Development in Conservation" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N12 [label="Camera Trap Deployment" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N13 [label="Conservation Education" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N14 [label="Rewilding Initiatives" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N15 [label="Human_Wildlife Conflict Mitigation" color="#92C79A" fillcolor="#E8F0EA" shape=folder style=filled]
+	N16 [label="Anti_Poaching Operations" color="#FFC2C2" fillcolor="#FFEBEB" shape=plaintext style=filled]
+	N17 [label="Habitat Restoration" color="#92C79A" fillcolor="#E8F0EA" shape=diamond style=filled]
+	N18 [label="Grassland Conservation" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	S1 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Sustainable Resource Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Protected Area Management" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+		nest0_1 [label="Drone_based Monitoring" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+		nest0_2 [label="Reintroduction Programs" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Species Monitoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Marine Conservation" color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+		nest1_1 [label="GIS Mapping for Habitats" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=certifies color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=funds_raises color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N17 -> nest0_0 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N9 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N4 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N9 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_315.txt b/test/graphviz/graph_hard/graphviz_315.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d93af5444460710dc36dab0f605aa887881ff5ac
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_315.txt
@@ -0,0 +1,36 @@
+<Anti_Poaching Operations, connectedTo, Habitat Restoration>
+<Camera Trap Deployment, connectedTo, Conservation Education>
+<Captive Breeding Programs, connectedTo, Ecological Survey>
+<Climate Change Adaptation for Wildlife, connectedTo, Research and Development in Conservation>
+<Conservation Education, connectedTo, Rewilding Initiatives>
+<Conservation Genetics, funds_raises, Ecosystem Services Valuation>
+<Drone_based Monitoring, connectedTo, Reintroduction Programs>
+<Drone_based Monitoring, partOf, Drone_based Monitoring>
+<Ecological Survey, connectedTo, Ecosystem Services Valuation>
+<Ecological Survey, connectedTo, Ecotourism Management>
+<Ecosystem Services Valuation, connectedTo, Climate Change Adaptation for Wildlife>
+<Ecotourism Management, connectedTo, Marine Conservation>
+<Ecotourism Management, connectedTo, Population Dynamics Study>
+<GIS Mapping for Habitats, connectedTo, Ecological Survey>
+<GIS Mapping for Habitats, partOf, GIS Mapping for Habitats>
+<Habitat Restoration, connectedTo, Grassland Conservation>
+<Habitat Restoration, connectedTo, Protected Area Management>
+<Human_Wildlife Conflict Mitigation, connectedTo, Anti_Poaching Operations>
+<Invasive Species Control, connectedTo, Conservation Genetics>
+<Marine Conservation, connectedTo, GIS Mapping for Habitats>
+<Marine Conservation, partOf, Marine Conservation>
+<Policy Advocacy, connectedTo, Captive Breeding Programs>
+<Policy Advocacy, connectedTo, Ecosystem Services Valuation>
+<Policy Advocacy, connectedTo, Translocation of Species>
+<Pollution Impact Assessment, connectedTo, Captive Breeding Programs>
+<Pollution Impact Assessment, connectedTo, Policy Advocacy>
+<Population Dynamics Study, connectedTo, Invasive Species Control>
+<Protected Area Management, connectedTo, Drone_based Monitoring>
+<Protected Area Management, partOf, Protected Area Management>
+<Reintroduction Programs, connectedTo, Ecosystem Services Valuation>
+<Reintroduction Programs, partOf, Reintroduction Programs>
+<Research and Development in Conservation, connectedTo, Camera Trap Deployment>
+<Rewilding Initiatives, connectedTo, Human_Wildlife Conflict Mitigation>
+<Translocation of Species, certifies, Captive Breeding Programs>
+<Translocation of Species, connectedTo, Conservation Genetics>
+<Translocation of Species, connectedTo, Grassland Conservation>
diff --git a/test/graphviz/graph_hard/graphviz_316.dot b/test/graphviz/graph_hard/graphviz_316.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cd169b502d950e801c913ea8b8bdc31b9470f067
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_316.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=BT
+	N0 [label="Physical Oceanography" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N1 [label="Coastal Zone Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N2 [label="Ocean Acidification Research" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N3 [label="Ocean Data Archiving" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N4 [label="Marine Hazards Assessment" color="#7986CB" fillcolor="#E8EAF6" shape=plaintext style=filled]
+	N5 [label="Satellite Oceanography" color="#7986CB" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	N6 [label="Chemical Oceanography" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N7 [label="Ocean Drilling Programs" color="#7986CB" fillcolor="#E8EAF6" shape=diamond style=filled]
+	N8 [label="Buoy Deployment" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N9 [label="Fisheries Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N10 [label="Hydrothermal Vent Exploration" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N11 [label="Coral Reef Monitoring" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N12 [label="Polar Oceanography" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	S0 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Tsunami Prediction" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Ocean Temperature Sensing" color="#CFCFCF" fillcolor="#F6F6F6" shape=diamond style=filled]
+		nest0_1 [label="Ocean Floor Mapping" color="#7986CB" fillcolor="#E8EAF6" shape=folder style=filled]
+		nest0_2 [label="Acoustic Oceanography" color="#CFCFCF" fillcolor="#F6F6F6" shape=oval style=filled]
+		nest0_0 -> nest0_1 [label=conserves color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Data Visualization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Ocean Renewable Energy" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+		nest1_1 [label="Sediment Analysis" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+		nest1_2 [label="Marine Pollution Monitoring" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+		nest1_3 [label="Climate Change Impact Study" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=understands color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=operates_ROVs color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N3 [label=simulates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> S0 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [label=interprets color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_316.txt b/test/graphviz/graph_hard/graphviz_316.txt
new file mode 100644
index 0000000000000000000000000000000000000000..190394d8ccd9ad0c9da4ccbee71f3bcb8d2ecb8e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_316.txt
@@ -0,0 +1,36 @@
+<Acoustic Oceanography, partOf, Acoustic Oceanography>
+<Acoustic Oceanography, simulates, Ocean Data Archiving>
+<Buoy Deployment, operates_ROVs, Fisheries Management>
+<Chemical Oceanography, connectedTo, Buoy Deployment>
+<Chemical Oceanography, connectedTo, Ocean Drilling Programs>
+<Climate Change Impact Study, connectedTo, Fisheries Management>
+<Climate Change Impact Study, partOf, Climate Change Impact Study>
+<Coastal Zone Management, connectedTo, Buoy Deployment>
+<Coastal Zone Management, connectedTo, Ocean Acidification Research>
+<Coastal Zone Management, connectedTo, Satellite Oceanography>
+<Coral Reef Monitoring, connectedTo, Polar Oceanography>
+<Fisheries Management, connectedTo, Hydrothermal Vent Exploration>
+<Fisheries Management, connectedTo, Ocean Temperature Sensing>
+<Hydrothermal Vent Exploration, connectedTo, Coral Reef Monitoring>
+<Marine Hazards Assessment, connectedTo, Satellite Oceanography>
+<Marine Pollution Monitoring, connectedTo, Climate Change Impact Study>
+<Marine Pollution Monitoring, partOf, Marine Pollution Monitoring>
+<Ocean Acidification Research, connectedTo, Buoy Deployment>
+<Ocean Acidification Research, connectedTo, Ocean Data Archiving>
+<Ocean Data Archiving, connectedTo, Ocean Renewable Energy>
+<Ocean Data Archiving, connectedTo, Satellite Oceanography>
+<Ocean Data Archiving, understands, Marine Hazards Assessment>
+<Ocean Drilling Programs, connectedTo, Buoy Deployment>
+<Ocean Drilling Programs, connectedTo, Polar Oceanography>
+<Ocean Drilling Programs, interprets, Hydrothermal Vent Exploration>
+<Ocean Floor Mapping, connectedTo, Acoustic Oceanography>
+<Ocean Floor Mapping, partOf, Ocean Floor Mapping>
+<Ocean Renewable Energy, connectedTo, Sediment Analysis>
+<Ocean Renewable Energy, partOf, Ocean Renewable Energy>
+<Ocean Temperature Sensing, conserves, Ocean Floor Mapping>
+<Ocean Temperature Sensing, partOf, Ocean Temperature Sensing>
+<Physical Oceanography, connectedTo, Coastal Zone Management>
+<Physical Oceanography, connectedTo, Satellite Oceanography>
+<Satellite Oceanography, connectedTo, Chemical Oceanography>
+<Sediment Analysis, connectedTo, Marine Pollution Monitoring>
+<Sediment Analysis, partOf, Sediment Analysis>
diff --git a/test/graphviz/graph_hard/graphviz_317.dot b/test/graphviz/graph_hard/graphviz_317.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cc6ac7e0a12c20eca30b3e8bf00ba2ae94c0707a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_317.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=BT
+	N0 [label="Fisheries Management" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N1 [label="Ocean Renewable Energy" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N2 [label="Marine Protected Area Planning" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N3 [label="Marine Pollution Monitoring" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N4 [label="Ocean Drilling Programs" color="#AB47BC" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N5 [label="Plastic Pollution Research" color="#AB47BC" fillcolor="#F3E5F5" shape=octagon style=filled]
+	N6 [label="Ocean Acidification Research" color="#FFC107" fillcolor="#FFECB3" shape=diamond style=filled]
+	N7 [label="Marine Remote Sensing" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N8 [label="Polar Oceanography" color="#E0E0E0" fillcolor="#EBEBEB" shape=plaintext style=filled]
+	N9 [label="Marine Geology" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N10 [label="Biological Oceanography" color="#E0E0E0" fillcolor="#EBEBEB" shape=folder style=filled]
+	N11 [label="Seabed Resource Exploration" color="#E0E0E0" fillcolor="#EBEBEB" shape=octagon style=filled]
+	N12 [label="Acoustic Oceanography" color="#FFC107" fillcolor="#FFECB3" shape=folder style=filled]
+	N13 [label="Marine Biodiversity Assessment" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	S0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Buoy Deployment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Ocean Temperature Sensing" color="#FFC107" fillcolor="#FFECB3" shape=Mdiamond style=filled]
+		nest0_1 [label="ROV or AUV Operations" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Salinity Measurement" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Data Visualization" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+		nest1_1 [label="Deep_Sea Exploration" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest1_2 [label="Physical Oceanography" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=researches color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=ecosystems color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N10 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N11 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [label=simulates color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S2 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_318.dot b/test/graphviz/graph_hard/graphviz_318.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9df3bb1f71b932717d8230f1b0ad23dbcf690d33
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_318.dot
@@ -0,0 +1,88 @@
+digraph {
+	rankdir=BT
+	N0 [label="Marine Biodiversity Assessment" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N1 [label="Hydrothermal Vent Exploration" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N2 [label="Tsunami Prediction" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+	N3 [label="Ocean Drilling Programs" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N4 [label="Ocean Modeling" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N5 [label="Ocean Temperature Sensing" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N6 [label="Climate Change Impact Study" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N7 [label="Coastal Erosion Research" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N8 [label="Plastic Pollution Research" color="#FFEB3B" fillcolor="#FFF9C4" shape=parallelogram style=filled]
+	N9 [label="Ocean Floor Mapping" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N10 [label="Fisheries Management" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N11 [label="Ocean Acidification Research" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+	N12 [label="Marine Geology" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N13 [label="Marine Pollution Monitoring" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N14 [label="Sediment Analysis" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N15 [label="Coastal Zone Management" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+	N16 [label="Salinity Measurement" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	S0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Polar Oceanography" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Marine Life Observation" color="#FFE470" fillcolor="#FFFAE0" shape=parallelogram style=filled]
+		nest0_1 [label="Sea Level Monitoring" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest0_2 [label="Coral Reef Monitoring" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+		nest0_3 [label="Ocean Current Measurement" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [label=observes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Marine Ecosystem Health" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Chemical Oceanography" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+		nest1_1 [label="Underwater Acoustics" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest1_2 [label="Marine Remote Sensing" color="#FFE470" fillcolor="#FFFAE0" shape=oval style=filled]
+		nest1_3 [label="Biological Oceanography" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest1_0 -> nest1_1 [label=maintains_buoys color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [label=simulates color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N8 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N13 -> S0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N8 -> S1 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N10 -> M1 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	M1 -> N14 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N6 -> M2 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	M2 -> N9 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_318.txt b/test/graphviz/graph_hard/graphviz_318.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2b047c21e211249b71ff1b2e97919f7c299512ad
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_318.txt
@@ -0,0 +1,49 @@
+<Biological Oceanography, connectedTo, Plastic Pollution Research>
+<Biological Oceanography, partOf, Biological Oceanography>
+<Chemical Oceanography, maintains_buoys, Underwater Acoustics>
+<Chemical Oceanography, partOf, Chemical Oceanography>
+<Climate Change Impact Study, connectedTo, Coastal Erosion Research>
+<Climate Change Impact Study, connectedTo, Fisheries Management>
+<Climate Change Impact Study, connectedTo, Ocean Floor Mapping>
+<Climate Change Impact Study, connectedTo, Sediment Analysis>
+<Coastal Erosion Research, connectedTo, Ocean Floor Mapping>
+<Coastal Erosion Research, connectedTo, Plastic Pollution Research>
+<Coastal Zone Management, connectedTo, Salinity Measurement>
+<Coral Reef Monitoring, observes, Ocean Current Measurement>
+<Coral Reef Monitoring, partOf, Coral Reef Monitoring>
+<Fisheries Management, connectedTo, Ocean Acidification Research>
+<Fisheries Management, connectedTo, Sediment Analysis>
+<Hydrothermal Vent Exploration, connectedTo, Tsunami Prediction>
+<Marine Biodiversity Assessment, connectedTo, Fisheries Management>
+<Marine Biodiversity Assessment, connectedTo, Hydrothermal Vent Exploration>
+<Marine Biodiversity Assessment, connectedTo, Ocean Floor Mapping>
+<Marine Geology, connectedTo, Marine Pollution Monitoring>
+<Marine Life Observation, connectedTo, Sea Level Monitoring>
+<Marine Life Observation, partOf, Marine Life Observation>
+<Marine Pollution Monitoring, connectedTo, Coastal Zone Management>
+<Marine Pollution Monitoring, connectedTo, Salinity Measurement>
+<Marine Pollution Monitoring, connectedTo, Sediment Analysis>
+<Marine Remote Sensing, connectedTo, Biological Oceanography>
+<Marine Remote Sensing, partOf, Marine Remote Sensing>
+<Ocean Acidification Research, connectedTo, Marine Geology>
+<Ocean Current Measurement, connectedTo, Marine Geology>
+<Ocean Current Measurement, partOf, Ocean Current Measurement>
+<Ocean Drilling Programs, connectedTo, Chemical Oceanography>
+<Ocean Drilling Programs, connectedTo, Ocean Modeling>
+<Ocean Drilling Programs, simulates, Marine Life Observation>
+<Ocean Floor Mapping, connectedTo, Fisheries Management>
+<Ocean Floor Mapping, connectedTo, Sediment Analysis>
+<Ocean Modeling, connectedTo, Ocean Floor Mapping>
+<Ocean Modeling, connectedTo, Ocean Temperature Sensing>
+<Ocean Temperature Sensing, connectedTo, Climate Change Impact Study>
+<Ocean Temperature Sensing, connectedTo, Fisheries Management>
+<Ocean Temperature Sensing, connectedTo, Sediment Analysis>
+<Plastic Pollution Research, connectedTo, Fisheries Management>
+<Plastic Pollution Research, connectedTo, Ocean Floor Mapping>
+<Plastic Pollution Research, connectedTo, Sediment Analysis>
+<Sea Level Monitoring, connectedTo, Coral Reef Monitoring>
+<Sea Level Monitoring, partOf, Sea Level Monitoring>
+<Sediment Analysis, connectedTo, Coastal Zone Management>
+<Tsunami Prediction, connectedTo, Ocean Drilling Programs>
+<Underwater Acoustics, connectedTo, Marine Remote Sensing>
+<Underwater Acoustics, partOf, Underwater Acoustics>
diff --git a/test/graphviz/graph_hard/graphviz_319.txt b/test/graphviz/graph_hard/graphviz_319.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c05ba553407c2ac2b84f06b302d53bcb8c16e4ee
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_319.txt
@@ -0,0 +1,40 @@
+<Computational Seismology, connectedTo, Geophysical Exploration>
+<Computational Seismology, connectedTo, Liquefaction Potential Assessment>
+<Computational Seismology, connectedTo, Seismic Instrumentation Maintenance>
+<Computational Seismology, simulates, Nuclear Test Monitoring>
+<Earth Structure Imaging, connectedTo, Earthquake Detection>
+<Earth Structure Imaging, partOf, Earth Structure Imaging>
+<Earthquake Detection, connectedTo, Structural Response to Earthquakes>
+<Earthquake Detection, partOf, Earthquake Detection>
+<Emergency Preparedness for Earthquakes, connectedTo, Seismic Network Operations>
+<Emergency Preparedness for Earthquakes, connectedTo, Volcanic Seismology>
+<Emergency Preparedness for Earthquakes, volcanic_activity, Fault Line Mapping>
+<Epicenter Location, connectedTo, Liquefaction Potential Assessment>
+<Epicenter Location, connectedTo, Seismic Instrumentation Maintenance>
+<Fault Line Mapping, connectedTo, Magnitude Determination>
+<Geophysical Exploration, connectedTo, Seismic Risk Mitigation>
+<Ground Motion Prediction, connectedTo, Structural Response to Earthquakes>
+<Liquefaction Potential Assessment, connectedTo, Emergency Preparedness for Earthquakes>
+<Liquefaction Potential Assessment, connectedTo, Seismic Wave Analysis>
+<Magnitude Determination, connectedTo, Seismic Network Operations>
+<Nuclear Test Monitoring, connectedTo, Epicenter Location>
+<Nuclear Test Monitoring, connectedTo, Geophysical Exploration>
+<Nuclear Test Monitoring, connectedTo, Liquefaction Potential Assessment>
+<Nuclear Test Monitoring, connectedTo, Seismic Instrumentation Maintenance>
+<Seismic Instrumentation Maintenance, connectedTo, Earth Structure Imaging>
+<Seismic Instrumentation Maintenance, connectedTo, Geophysical Exploration>
+<Seismic Risk Mitigation, connectedTo, Liquefaction Potential Assessment>
+<Seismic Wave Analysis, analyzes, Tectonic Stress Measurement>
+<Seismic Wave Analysis, partOf, Seismic Wave Analysis>
+<Structural Response to Earthquakes, connectedTo, Tectonic Plate Movement Monitoring>
+<Subsurface Imaging, connectedTo, Computational Seismology>
+<Subsurface Imaging, connectedTo, Geophysical Exploration>
+<Subsurface Imaging, connectedTo, Liquefaction Potential Assessment>
+<Subsurface Imaging, connectedTo, Seismic Instrumentation Maintenance>
+<Tectonic Plate Movement Monitoring, receives, Fault Line Mapping>
+<Tectonic Stress Measurement, connectedTo, Structural Response to Earthquakes>
+<Tectonic Stress Measurement, partOf, Tectonic Stress Measurement>
+<Volcanic Seismology, connectedTo, Fault Line Mapping>
+<Volcanic Seismology, connectedTo, Ground Motion Prediction>
+<Volcanic Seismology, connectedTo, Magnitude Determination>
+<Volcanic Seismology, connectedTo, Tectonic Plate Movement Monitoring>
diff --git a/test/graphviz/graph_hard/graphviz_32.dot b/test/graphviz/graph_hard/graphviz_32.dot
new file mode 100644
index 0000000000000000000000000000000000000000..725d8e4c3f16944f0b97a7d8612ec3048d72667a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_32.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=TD
+	N0 [label="Automated Milking" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N1 [label="Yield Prediction" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N2 [label="Organic Certification" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N3 [label="Subsidy Application" color="#4DB6AC" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N4 [label="Drone Scouting" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N5 [label="Weather Tracking" color="#3F51B5" fillcolor="#C5CAE9" shape=parallelogram style=filled]
+	N6 [label=Harvesting color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N7 [label="Fencing Installation" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N8 [label="Barn Cleaning" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N9 [label="Equipment Repair" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N10 [label="Grain Drying" color="#4DB6AC" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N11 [label="Farm Maintenance" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N12 [label="Farm Machinery Operation" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N13 [label="Food Processing" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	S0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Market Transportation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Supply Chain to Retailers" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest0_1 [label="Water Level Measurement" color="#64B5F6" fillcolor="#E3F2FD" shape=octagon style=filled]
+		nest0_2 [label="Crop Rotation Planning" color="#3F51B5" fillcolor="#C5CAE9" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Aquaculture Farming" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Traceability System" color="#64B5F6" fillcolor="#E3F2FD" shape=folder style=filled]
+		nest1_1 [label="Hydroponic System Management" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest1_2 [label="Greenhouse Control" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=rotates color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=sustains color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest0_0 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N12 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N8 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N9 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N10 -> S1 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_320.dot b/test/graphviz/graph_hard/graphviz_320.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3939ce925f8dc862a91592e2dc8adf05e2cc7682
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_320.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=BT
+	N0 [label="Seismic Network Operations" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N1 [label="Tectonic Stress Measurement" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+	N2 [label="Seismic Instrumentation Maintenance" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N3 [label="Induced Seismicity Monitoring" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N4 [label="Strong Motion Instrumentation" color="#80DDEA" fillcolor="#D3F7F9" shape=parallelogram style=filled]
+	N5 [label="Earthquake Detection" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N6 [label="Seismic Hazard Assessment" color="#FF5722" fillcolor="#FFCCBC" shape=oval style=filled]
+	N7 [label="Ground Motion Prediction" color="#80DDEA" fillcolor="#D3F7F9" shape=folder style=filled]
+	N8 [label="Computational Seismology" color="#FFF8A6" fillcolor="#FFFDE0" shape=Mdiamond style=filled]
+	N9 [label="Structural Response to Earthquakes" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N10 [label="Magnitude Determination" color="#80DDEA" fillcolor="#D3F7F9" shape=plaintext style=filled]
+	N11 [label="Liquefaction Potential Assessment" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N12 [label="Seismic Wave Analysis" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N13 [label="Tsunami Warning Systems" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N14 [label="Earthquake Prediction Research" color="#FF5722" fillcolor="#FFCCBC" shape=octagon style=filled]
+	N15 [label=Paleoseismology color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	S0 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Earthquake Early Warning Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Fault Line Mapping" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+		nest0_1 [label="Glacial Seismology" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Seismic Data Processing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Data Archiving and Distribution" color="#80DDEA" fillcolor="#D3F7F9" shape=Mdiamond style=filled]
+		nest1_1 [label="P_Wave or S_Wave Distinction" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+		nest1_2 [label="Geophysical Exploration" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=models color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N6 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N10 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N13 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	M2 -> N15 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_321.dot b/test/graphviz/graph_hard/graphviz_321.dot
new file mode 100644
index 0000000000000000000000000000000000000000..57d889474f103f78bbbed054cc18f750c4f432e6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_321.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label=Paleoseismology color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Seismic Noise Analysis" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N2 [label="Subsurface Imaging" color="#F7BEE0" fillcolor="#FAEBF3" shape=oval style=filled]
+	N3 [label="Induced Seismicity Monitoring" color="#F7BEE0" fillcolor="#FAEBF3" shape=oval style=filled]
+	N4 [label="Nuclear Test Monitoring" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N5 [label="Glacial Seismology" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N6 [label="Planetary Seismology" color="#FF5722" fillcolor="#FFCCBC" shape=octagon style=filled]
+	N7 [label="Earth Structure Imaging" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N8 [label="Structural Response to Earthquakes" color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+	N9 [label="Magnitude Determination" color="#F7BEE0" fillcolor="#FAEBF3" shape=plaintext style=filled]
+	N10 [label="Tectonic Plate Movement Monitoring" color="#FFA726" fillcolor="#FFF3E0" shape=parallelogram style=filled]
+	N11 [label="Seismic Instrumentation Maintenance" color="#F7BEE0" fillcolor="#FAEBF3" shape=folder style=filled]
+	N12 [label="Computational Seismology" color="#FF5722" fillcolor="#FFCCBC" shape=folder style=filled]
+	N13 [label="Ground Motion Prediction" color="#F7BEE0" fillcolor="#FAEBF3" shape=octagon style=filled]
+	N14 [label="Geophysical Exploration" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Data Archiving and Distribution" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Tsunami Warning Systems" color="#FFA726" fillcolor="#FFF3E0" shape=plaintext style=filled]
+		nest0_1 [label="Seismic Tomography" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+		nest0_2 [label="Deep Earth Seismology" color="#F7BEE0" fillcolor="#FAEBF3" shape=oval style=filled]
+		nest0_3 [label="Tectonic Stress Measurement" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Seismic Network Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Epicenter Location" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest1_1 [label="Earthquake Detection" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+		nest1_2 [label="Emergency Preparedness for Earthquakes" color="#FFA726" fillcolor="#FFF3E0" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N7 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N11 [label=responds color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M2 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_322.txt b/test/graphviz/graph_hard/graphviz_322.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6c8659139c948f998c11e04e5dcbd24440a58acf
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_322.txt
@@ -0,0 +1,34 @@
+<Biomarker Discovery, connectedTo, Functional Genomics>
+<Biomarker Discovery, connectedTo, Variant Calling>
+<Biomarker Discovery, partOf, Biomarker Discovery>
+<Cloning Technologies, connectedTo, Functional Genomics>
+<Cloning Technologies, partOf, Cloning Technologies>
+<Computational Genomics, connectedTo, Methylation Analysis>
+<Computational Genomics, connectedTo, Transcriptomics>
+<Disease Gene Identification, connectedTo, Epigenomics>
+<Disease Gene Identification, diagnoses, Structural Genomics>
+<Disease Gene Identification, maps, Transcriptomics>
+<Epigenomics, connectedTo, Methylation Analysis>
+<Epigenomics, connectedTo, Transcriptomics>
+<Functional Genomics, connectedTo, Genomic Editing>
+<Functional Genomics, partOf, Functional Genomics>
+<Genome_Wide Association Studies, connectedTo, Spatial Genomics>
+<Genomic Data Analysis, connectedTo, Genomic Data Sharing>
+<Genomic Data Analysis, partOf, Genomic Data Analysis>
+<Genomic Data Sharing, connectedTo, Single_Cell Genomics>
+<Genomic Data Sharing, partOf, Genomic Data Sharing>
+<Genomic Editing, connectedTo, Biomarker Discovery>
+<Genomic Editing, connectedTo, Personalized Medicine>
+<Metabolomics, connectedTo, Computational Genomics>
+<Methylation Analysis, connectedTo, Disease Gene Identification>
+<Next_Generation Sequencing, connectedTo, Genomic Editing>
+<Personalized Medicine, connectedTo, Genome_Wide Association Studies>
+<Personalized Medicine, connectedTo, Transcriptomics>
+<Single_Cell Genomics, partOf, Single_Cell Genomics>
+<Single_Cell Genomics, privacy_protects, Methylation Analysis>
+<Spatial Genomics, connectedTo, Metabolomics>
+<Spatial Genomics, connectedTo, Transcriptomics>
+<Structural Genomics, connectedTo, Epigenomics>
+<Structural Genomics, connectedTo, Genomic Data Analysis>
+<Variant Calling, connectedTo, Cloning Technologies>
+<Variant Calling, partOf, Variant Calling>
diff --git a/test/graphviz/graph_hard/graphviz_323.txt b/test/graphviz/graph_hard/graphviz_323.txt
new file mode 100644
index 0000000000000000000000000000000000000000..769febe0d650940d26f7a046420dd73af0e7eaa8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_323.txt
@@ -0,0 +1,48 @@
+<Bioinformatics Pipeline Development, connectedTo, Biomarker Discovery>
+<Bioinformatics Pipeline Development, partOf, Bioinformatics Pipeline Development>
+<Biomarker Discovery, connectedTo, Rare Disease Genomics>
+<Biomarker Discovery, partOf, Biomarker Discovery>
+<Comparative Genomics, connectedTo, Data Privacy in Genomics>
+<DNA Sequencing, connectedTo, Epigenomics>
+<DNA Sequencing, connectedTo, Gene Therapy Development>
+<DNA Sequencing, connectedTo, Genomic Editing>
+<DNA Sequencing, connectedTo, Metabolomics>
+<DNA Sequencing, connectedTo, Synthetic Genomics>
+<Data Privacy in Genomics, connectedTo, Population Genomics>
+<Epigenomics, connectedTo, Comparative Genomics>
+<Epigenomics, connectedTo, Gene Annotation>
+<Gene Annotation, connectedTo, Genomic Editing>
+<Gene Annotation, connectedTo, Metabolomics>
+<Gene Annotation, connectedTo, Methylation Analysis>
+<Gene Annotation, connectedTo, Personalized Medicine>
+<Gene Annotation, connectedTo, Population Genomics>
+<Gene Annotation, predicts, Genomic Editing>
+<Gene Expression Profiling, connectedTo, Genomic Data Visualization>
+<Gene Therapy Development, accesses_data, Epigenomics>
+<Gene Therapy Development, connectedTo, Comparative Genomics>
+<Gene Therapy Development, connectedTo, Genomic Editing>
+<Genetic Counseling, connectedTo, Metabolomics>
+<Genome Assembly, connectedTo, Genomic Editing>
+<Genome Assembly, connectedTo, Pharmacogenomics>
+<Genome_Wide Association Studies, connectedTo, Spatial Genomics>
+<Genome_Wide Association Studies, partOf, Genome_Wide Association Studies>
+<Genomic Data Sharing, connectedTo, Genome_Wide Association Studies>
+<Genomic Data Sharing, partOf, Genomic Data Sharing>
+<Genomic Data Visualization, connectedTo, Spatial Genomics>
+<Genomic Editing, connectedTo, Comparative Genomics>
+<Metabolomics, connectedTo, Personalized Medicine>
+<Metabolomics, genes_studies, Genomic Data Sharing>
+<Methylation Analysis, connectedTo, Genomic Editing>
+<Pharmacogenomics, connectedTo, Gene Annotation>
+<Pharmacogenomics, connectedTo, Gene Expression Profiling>
+<Pharmacogenomics, connectedTo, Genomic Editing>
+<Pharmacogenomics, connectedTo, Spatial Genomics>
+<Population Genomics, connectedTo, Bioinformatics Pipeline Development>
+<Population Genomics, connectedTo, Transcriptomics>
+<Proteomics, connectedTo, Comparative Genomics>
+<Proteomics, connectedTo, Genome Assembly>
+<Rare Disease Genomics, licenses, Comparative Genomics>
+<Rare Disease Genomics, partOf, Rare Disease Genomics>
+<Spatial Genomics, compares, DNA Sequencing>
+<Synthetic Genomics, connectedTo, Gene Therapy Development>
+<Transcriptomics, connectedTo, Genetic Counseling>
diff --git a/test/graphviz/graph_hard/graphviz_324.dot b/test/graphviz/graph_hard/graphviz_324.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0d64922590e2022b9b9c859e3cbaa27941ae0099
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_324.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=RL
+	N0 [label="Gene Therapy Development" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N1 [label="Computational Genomics" color="#9FA9E1" fillcolor="#D6D9F0" shape=plaintext style=filled]
+	N2 [label="Biomarker Discovery" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N3 [label="Comparative Genomics" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N4 [label="DNA Sequencing" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N5 [label="Gene Expression Profiling" color="#00BCD4" fillcolor="#E0F7FA" shape=oval style=filled]
+	N6 [label="Synthetic Genomics" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N7 [label=Epigenomics color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N8 [label="Data Privacy in Genomics" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N9 [label="Methylation Analysis" color="#00BCD4" fillcolor="#E0F7FA" shape=oval style=filled]
+	N10 [label=Proteomics color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N11 [label="Long_Read Sequencing" color="#00BCD4" fillcolor="#E0F7FA" shape=diamond style=filled]
+	N12 [label="Rare Disease Genomics" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#D2D2D2" fillcolor="#F0F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#D2D2D2" fillcolor="#F0F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Genome_Wide Association Studies" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Genomic Editing" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest0_1 [label="Genomic Data Visualization" color="#D2D2D2" fillcolor="#F0F0F0" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label=Pharmacogenomics labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="CRISPR Gene Drive Research" color="#00BCD4" fillcolor="#E0F7FA" shape=plaintext style=filled]
+		nest1_1 [label=Metabolomics color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest1_2 [label="Genomic Data Sharing" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest1_3 [label="Genome Assembly" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N7 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [label=analyzes color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N11 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [label=publishes color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S2 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M2 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_324.txt b/test/graphviz/graph_hard/graphviz_324.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6e9a1f9fbd1d147a2352c46157f253d85da6beec
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_324.txt
@@ -0,0 +1,39 @@
+<Biomarker Discovery, connectedTo, Comparative Genomics>
+<CRISPR Gene Drive Research, connectedTo, Metabolomics>
+<CRISPR Gene Drive Research, partOf, CRISPR Gene Drive Research>
+<Comparative Genomics, connectedTo, DNA Sequencing>
+<Comparative Genomics, connectedTo, Data Privacy in Genomics>
+<Comparative Genomics, connectedTo, Genomic Editing>
+<Computational Genomics, analyzes, CRISPR Gene Drive Research>
+<Computational Genomics, connectedTo, Biomarker Discovery>
+<Computational Genomics, connectedTo, Comparative Genomics>
+<Computational Genomics, connectedTo, Data Privacy in Genomics>
+<DNA Sequencing, connectedTo, Epigenomics>
+<DNA Sequencing, connectedTo, Gene Expression Profiling>
+<DNA Sequencing, connectedTo, Long_Read Sequencing>
+<DNA Sequencing, connectedTo, Rare Disease Genomics>
+<DNA Sequencing, publishes, Methylation Analysis>
+<Data Privacy in Genomics, connectedTo, Methylation Analysis>
+<Epigenomics, connectedTo, Data Privacy in Genomics>
+<Epigenomics, connectedTo, Long_Read Sequencing>
+<Epigenomics, connectedTo, Methylation Analysis>
+<Gene Expression Profiling, connectedTo, Synthetic Genomics>
+<Gene Therapy Development, connectedTo, Comparative Genomics>
+<Gene Therapy Development, connectedTo, Computational Genomics>
+<Genome Assembly, connectedTo, Long_Read Sequencing>
+<Genome Assembly, partOf, Genome Assembly>
+<Genomic Data Sharing, connectedTo, Genome Assembly>
+<Genomic Data Sharing, partOf, Genomic Data Sharing>
+<Genomic Data Visualization, connectedTo, Epigenomics>
+<Genomic Data Visualization, partOf, Genomic Data Visualization>
+<Genomic Editing, connectedTo, Genomic Data Visualization>
+<Genomic Editing, partOf, Genomic Editing>
+<Long_Read Sequencing, connectedTo, Rare Disease Genomics>
+<Metabolomics, connectedTo, Genomic Data Sharing>
+<Metabolomics, partOf, Metabolomics>
+<Methylation Analysis, connectedTo, Long_Read Sequencing>
+<Methylation Analysis, connectedTo, Proteomics>
+<Methylation Analysis, connectedTo, Rare Disease Genomics>
+<Proteomics, connectedTo, Long_Read Sequencing>
+<Synthetic Genomics, connectedTo, Data Privacy in Genomics>
+<Synthetic Genomics, connectedTo, Epigenomics>
diff --git a/test/graphviz/graph_hard/graphviz_325.txt b/test/graphviz/graph_hard/graphviz_325.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cc7638720735d54bc0d6e19208d4ed5bfd93f115
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_325.txt
@@ -0,0 +1,37 @@
+<Accent Recognition, connectedTo, Contextual Understanding>
+<Accent Recognition, partOf, Accent Recognition>
+<Children's Speech Recognition, connectedTo, Speech_to_Text Conversion>
+<Children's Speech Recognition, partOf, Children's Speech Recognition>
+<Contextual Understanding, connectedTo, Children's Speech Recognition>
+<Contextual Understanding, connectedTo, Dialect Adaptation>
+<Contextual Understanding, connectedTo, Medical Transcription>
+<Dialect Adaptation, connectedTo, Multimodal Speech Processing>
+<Disordered Speech Recognition, connectedTo, Voice User Interface Design>
+<Legal Transcription, connectedTo, Contextual Understanding>
+<Legal Transcription, connectedTo, Dialect Adaptation>
+<Legal Transcription, connectedTo, Disordered Speech Recognition>
+<Legal Transcription, connectedTo, Medical Transcription>
+<Legal Transcription, connectedTo, Multimodal Speech Processing>
+<Legal Transcription, develops, Voice User Interface Design>
+<Medical Transcription, builds, Meeting Transcription>
+<Medical Transcription, connectedTo, Dialect Adaptation>
+<Meeting Transcription, connectedTo, Dialect Adaptation>
+<Meeting Transcription, connectedTo, Speech Analytics>
+<Meeting Transcription, tests, Voice Assistant Development>
+<Multimodal Speech Processing, connectedTo, Disordered Speech Recognition>
+<Multimodal Speech Processing, connectedTo, Phonetic Transcription>
+<Noise Reduction, connectedTo, Robust Speech Recognition>
+<Noise Reduction, partOf, Noise Reduction>
+<Phonetic Transcription, connectedTo, Disordered Speech Recognition>
+<Robust Speech Recognition, connectedTo, Medical Transcription>
+<Robust Speech Recognition, partOf, Robust Speech Recognition>
+<Speech Analytics, connectedTo, Speech Emotion Recognition>
+<Speech Analytics, partOf, Speech Analytics>
+<Speech Emotion Recognition, connectedTo, Noise Reduction>
+<Speech Emotion Recognition, partOf, Speech Emotion Recognition>
+<Speech_to_Text Conversion, connectedTo, Accent Recognition>
+<Speech_to_Text Conversion, partOf, Speech_to_Text Conversion>
+<Voice Assistant Development, connectedTo, Disordered Speech Recognition>
+<Voice Assistant Development, connectedTo, Multimodal Speech Processing>
+<Voice Assistant Development, connectedTo, Voice User Interface Design>
+<Voice Assistant Development, designs, Dialect Adaptation>
diff --git a/test/graphviz/graph_hard/graphviz_326.txt b/test/graphviz/graph_hard/graphviz_326.txt
new file mode 100644
index 0000000000000000000000000000000000000000..55375bf70d381558add43e875140bc6e18702950
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_326.txt
@@ -0,0 +1,33 @@
+<Accent Recognition, connectedTo, Voice Search Optimization>
+<Acoustic Modeling, connectedTo, Cross_Lingual Speech Recognition>
+<Automatic Speech Recognition, connectedTo, Emotion Recognition from Voice>
+<Automatic Speech Recognition, outputs, Acoustic Modeling>
+<Call Center Automation, connectedTo, Accent Recognition>
+<Call Center Automation, connectedTo, Acoustic Modeling>
+<Call Center Automation, connectedTo, Meeting Transcription>
+<Cloud_based Speech Services, connectedTo, Call Center Automation>
+<Cross_Lingual Speech Recognition, connectedTo, Speech_to_Text Conversion>
+<Dialect Adaptation, connectedTo, Robust Speech Recognition>
+<Dialect Adaptation, partOf, Dialect Adaptation>
+<Disordered Speech Recognition, connectedTo, Dialect Adaptation>
+<Disordered Speech Recognition, partOf, Disordered Speech Recognition>
+<Emotion Recognition from Voice, connectedTo, Disordered Speech Recognition>
+<Emotion Recognition from Voice, connectedTo, Speaker Identification>
+<Keyword Spotting, connectedTo, Language Modeling>
+<Keyword Spotting, partOf, Keyword Spotting>
+<Language Modeling, connectedTo, Speaker Diarization>
+<Language Modeling, partOf, Language Modeling>
+<Meeting Transcription, connectedTo, Keyword Spotting>
+<Meeting Transcription, partOf, Meeting Transcription>
+<Natural Language Understanding, connectedTo, Automatic Speech Recognition>
+<Noise Reduction, builds, Acoustic Modeling>
+<Robust Speech Recognition, connectedTo, Cloud_based Speech Services>
+<Robust Speech Recognition, partOf, Robust Speech Recognition>
+<Speaker Diarization, partOf, Speaker Diarization>
+<Speaker Diarization, transcribes, Automatic Speech Recognition>
+<Speaker Identification, connectedTo, Acoustic Modeling>
+<Speaker Identification, connectedTo, Call Center Automation>
+<Speaker Identification, connectedTo, Cloud_based Speech Services>
+<Speaker Identification, connectedTo, Speech_to_Text Conversion>
+<Speaker Identification, converts, Acoustic Modeling>
+<Voice Search Optimization, connectedTo, Noise Reduction>
diff --git a/test/graphviz/graph_hard/graphviz_327.txt b/test/graphviz/graph_hard/graphviz_327.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0bf9605c37f916ac9b00a3594b5973cc2228b34d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_327.txt
@@ -0,0 +1,35 @@
+<Acoustic Modeling, connectedTo, Meeting Transcription>
+<Acoustic Modeling, partOf, Acoustic Modeling>
+<Children's Speech Recognition, connectedTo, Medical Transcription>
+<Children's Speech Recognition, partOf, Children's Speech Recognition>
+<Command and Control, connectedTo, Voice User Interface Design>
+<Contextual Understanding, connectedTo, Speech Emotion Recognition>
+<Contextual Understanding, connectedTo, Voice User Interface Design>
+<Dialect Adaptation, connectedTo, Disordered Speech Recognition>
+<Dialect Adaptation, connectedTo, Speech Emotion Recognition>
+<Dialect Adaptation, connectedTo, Voice User Interface Design>
+<Disordered Speech Recognition, connectedTo, Speech Emotion Recognition>
+<Disordered Speech Recognition, sells, Real_Time Captioning>
+<Medical Transcription, connectedTo, Multimodal Speech Processing>
+<Medical Transcription, partOf, Medical Transcription>
+<Meeting Transcription, connectedTo, Command and Control>
+<Meeting Transcription, connectedTo, Noise Reduction>
+<Meeting Transcription, connectedTo, Voice User Interface Design>
+<Multimodal Speech Processing, connectedTo, Voice User Interface Design>
+<Multimodal Speech Processing, partOf, Multimodal Speech Processing>
+<Noise Reduction, connectedTo, Acoustic Modeling>
+<Noise Reduction, partOf, Noise Reduction>
+<Real_Time Captioning, connectedTo, Contextual Understanding>
+<Real_Time Captioning, connectedTo, Speech Emotion Recognition>
+<Real_Time Captioning, connectedTo, Voice User Interface Design>
+<Real_Time Captioning, evaluates, Text_to_Speech Synthesis>
+<Robust Speech Recognition, connectedTo, Dialect Adaptation>
+<Robust Speech Recognition, connectedTo, Speech Emotion Recognition>
+<Speech Emotion Recognition, connectedTo, Text_to_Speech Synthesis>
+<Speech Emotion Recognition, connectedTo, Voice Activity Detection>
+<Speech Emotion Recognition, connectedTo, Voice User Interface Design>
+<Text_to_Speech Synthesis, connectedTo, Command and Control>
+<Text_to_Speech Synthesis, connectedTo, Meeting Transcription>
+<Text_to_Speech Synthesis, connectedTo, Voice User Interface Design>
+<Voice Activity Detection, connectedTo, Children's Speech Recognition>
+<Voice Activity Detection, partOf, Voice Activity Detection>
diff --git a/test/graphviz/graph_hard/graphviz_328.txt b/test/graphviz/graph_hard/graphviz_328.txt
new file mode 100644
index 0000000000000000000000000000000000000000..393182b26de722560caa0af9fc2c548572b24a0d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_328.txt
@@ -0,0 +1,41 @@
+<Annotation Tools, connectedTo, Vector Space Models>
+<Annotation Tools, partOf, Annotation Tools>
+<Author Attribution, connectedTo, Corpus Creation>
+<Automated Content Tagging, builds_tools, Concept Extraction>
+<Automated Content Tagging, connectedTo, Annotation Tools>
+<Automated Content Tagging, connectedTo, Information Extraction>
+<Concept Extraction, connectedTo, Author Attribution>
+<Concept Extraction, filters, Information Extraction>
+<Corpus Creation, connectedTo, Data Cleaning for Text>
+<Corpus Creation, connectedTo, Information Extraction>
+<Corpus Creation, connectedTo, Text Classification>
+<Corpus Creation, connectedTo, Tokenization>
+<Data Cleaning for Text, connectedTo, Relationship Extraction>
+<Deep Learning for NLP, connectedTo, News Article Analysis>
+<Deep Learning for NLP, partOf, Deep Learning for NLP>
+<Financial Text Analysis, connectedTo, Resume Parsing>
+<Financial Text Analysis, partOf, Financial Text Analysis>
+<Information Extraction, connectedTo, Named Entity Recognition>
+<Language Translation for Text Mining, connectedTo, Plagiarism Detection>
+<Named Entity Recognition, connectedTo, Language Translation for Text Mining>
+<Natural Language Processing, connectedTo, News Article Analysis>
+<News Article Analysis, sentiments, Text Classification>
+<Opinion Mining, researches, Information Extraction>
+<Plagiarism Detection, topics, Data Cleaning for Text>
+<Regular Expressions for Text, connectedTo, Financial Text Analysis>
+<Regular Expressions for Text, partOf, Regular Expressions for Text>
+<Resume Parsing, connectedTo, Opinion Mining>
+<Resume Parsing, connectedTo, Text Similarity Analysis>
+<Spam Detection, connectedTo, Information Extraction>
+<Spam Detection, connectedTo, Text Preprocessing>
+<Text Classification, connectedTo, Information Extraction>
+<Text Classification, connectedTo, Resume Parsing>
+<Text Preprocessing, connectedTo, Automated Content Tagging>
+<Text Preprocessing, connectedTo, News Article Analysis>
+<Text Preprocessing, connectedTo, Text Classification>
+<Text Similarity Analysis, partOf, Text Similarity Analysis>
+<Text Similarity Analysis, secures, Regular Expressions for Text>
+<Tokenization, connectedTo, Information Extraction>
+<Tokenization, connectedTo, Natural Language Processing>
+<Vector Space Models, connectedTo, Deep Learning for NLP>
+<Vector Space Models, partOf, Vector Space Models>
diff --git a/test/graphviz/graph_hard/graphviz_329.txt b/test/graphviz/graph_hard/graphviz_329.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bd09fb2c2e4611711f47eff5f72491b2a301cdc3
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_329.txt
@@ -0,0 +1,42 @@
+<Annotation Tools, connectedTo, Customer Feedback Analysis>
+<Annotation Tools, connectedTo, Part_of_Speech Tagging>
+<Annotation Tools, connectedTo, Relationship Extraction>
+<Annotation Tools, predicts, Legal Document Analysis>
+<Author Attribution, connectedTo, Annotation Tools>
+<Concept Extraction, connectedTo, Named Entity Recognition>
+<Concept Extraction, connectedTo, Opinion Mining>
+<Customer Feedback Analysis, connectedTo, Legal Document Analysis>
+<Data Cleaning for Text, connectedTo, Customer Feedback Analysis>
+<Data Cleaning for Text, partOf, Data Cleaning for Text>
+<Document Summarization, partOf, Document Summarization>
+<Document Summarization, transforms_data, Spam Detection>
+<Information Extraction, builds_tools, Regular Expressions for Text>
+<Information Extraction, connectedTo, Concept Extraction>
+<Information Extraction, connectedTo, Resume Parsing>
+<Information Extraction, trends, News Article Analysis>
+<Knowledge Graph Construction, connectedTo, Sentiment Analysis>
+<Legal Document Analysis, extracts, Part_of_Speech Tagging>
+<Named Entity Recognition, connectedTo, Opinion Mining>
+<News Article Analysis, connectedTo, Data Cleaning for Text>
+<News Article Analysis, partOf, News Article Analysis>
+<Opinion Mining, keywords, Text Similarity Analysis>
+<Plagiarism Detection, connectedTo, Author Attribution>
+<Plagiarism Detection, connectedTo, Customer Feedback Analysis>
+<Plagiarism Detection, connectedTo, Part_of_Speech Tagging>
+<Regular Expressions for Text, connectedTo, Concept Extraction>
+<Regular Expressions for Text, connectedTo, Resume Parsing>
+<Relationship Extraction, connectedTo, Vector Space Models>
+<Relationship Extraction, partOf, Relationship Extraction>
+<Resume Parsing, connectedTo, Concept Extraction>
+<Resume Parsing, connectedTo, Opinion Mining>
+<Sentiment Analysis, connectedTo, Plagiarism Detection>
+<Spam Detection, connectedTo, Knowledge Graph Construction>
+<Spam Detection, partOf, Spam Detection>
+<Text Clustering, connectedTo, Concept Extraction>
+<Text Clustering, connectedTo, Information Extraction>
+<Text Clustering, connectedTo, Resume Parsing>
+<Text Similarity Analysis, interprets, Topic Modeling>
+<Text Visualization, connectedTo, Knowledge Graph Construction>
+<Topic Modeling, connectedTo, Text Visualization>
+<Vector Space Models, connectedTo, Document Summarization>
+<Vector Space Models, partOf, Vector Space Models>
diff --git a/test/graphviz/graph_hard/graphviz_33.txt b/test/graphviz/graph_hard/graphviz_33.txt
new file mode 100644
index 0000000000000000000000000000000000000000..61ea68211d06948de88feaf35f4fd330faad0de6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_33.txt
@@ -0,0 +1,30 @@
+<Animal Health Monitoring, connectedTo, Pest Spraying>
+<Animal Health Monitoring, partOf, Animal Health Monitoring>
+<Automated Milking, connectedTo, Equipment Repair>
+<Automated Milking, connectedTo, Farm Maintenance>
+<Automated Milking, connectedTo, Supply Chain to Retailers>
+<Crop Monitoring, connectedTo, Animal Health Monitoring>
+<Crop Monitoring, connectedTo, Fertilizer Application>
+<Crop Monitoring, connectedTo, Produce Sorting>
+<Disease Detection, connectedTo, Farm Maintenance>
+<Equipment Repair, connectedTo, Disease Detection>
+<Equipment Repair, connectedTo, Farm Maintenance>
+<Farm Maintenance, connectedTo, Crop Monitoring>
+<Farm Maintenance, connectedTo, Fertilizer Application>
+<Farm Maintenance, connectedTo, Produce Sorting>
+<Farm Maintenance, connectedTo, Seedling Transplanting>
+<Food Processing, connectedTo, Equipment Repair>
+<Pest Spraying, connectedTo, Disease Detection>
+<Pest Spraying, partOf, Pest Spraying>
+<Precision Farming, connectedTo, Water Level Measurement>
+<Precision Farming, partOf, Precision Farming>
+<Produce Sorting, connectedTo, Fertilizer Application>
+<Seedling Transplanting, connectedTo, Crop Monitoring>
+<Seedling Transplanting, connectedTo, Fertilizer Application>
+<Seedling Transplanting, connectedTo, Precision Farming>
+<Seedling Transplanting, connectedTo, Produce Sorting>
+<Supply Chain to Retailers, connectedTo, Equipment Repair>
+<Supply Chain to Retailers, connectedTo, Farm Maintenance>
+<Supply Chain to Retailers, connectedTo, Food Processing>
+<Water Level Measurement, connectedTo, Seedling Transplanting>
+<Water Level Measurement, partOf, Water Level Measurement>
diff --git a/test/graphviz/graph_hard/graphviz_330.txt b/test/graphviz/graph_hard/graphviz_330.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0c7684f4f0c535614a9260394e69862c693164ab
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_330.txt
@@ -0,0 +1,28 @@
+<Annotation Tools, connectedTo, Relationship Extraction>
+<Annotation Tools, partOf, Annotation Tools>
+<Author Attribution, trends, Data Cleaning for Text>
+<Concept Extraction, connectedTo, Knowledge Graph Construction>
+<Concept Extraction, connectedTo, Opinion Mining>
+<Data Cleaning for Text, connectedTo, Deep Learning for NLP>
+<Data Cleaning for Text, connectedTo, Lemmatization or Stemming>
+<Data Cleaning for Text, connectedTo, Sentiment Analysis>
+<Data Cleaning for Text, connectedTo, Text Visualization>
+<Deep Learning for NLP, connectedTo, Document Summarization>
+<Deep Learning for NLP, connectedTo, Opinion Mining>
+<Deep Learning for NLP, connectedTo, Sentiment Analysis>
+<Document Summarization, connectedTo, Lemmatization or Stemming>
+<Knowledge Graph Construction, interprets, Legal Document Analysis>
+<Knowledge Graph Construction, partOf, Knowledge Graph Construction>
+<Legal Document Analysis, complies, Relationship Extraction>
+<Legal Document Analysis, connectedTo, Sentiment Analysis>
+<Legal Document Analysis, partOf, Legal Document Analysis>
+<Lemmatization or Stemming, connectedTo, News Article Analysis>
+<Lemmatization or Stemming, connectedTo, Relationship Extraction>
+<Lemmatization or Stemming, connectedTo, Sentiment Analysis>
+<Natural Language Processing, connectedTo, Annotation Tools>
+<Natural Language Processing, partOf, Natural Language Processing>
+<News Article Analysis, connectedTo, Sentiment Analysis>
+<Opinion Mining, connectedTo, Text Visualization>
+<Sentiment Analysis, connectedTo, Concept Extraction>
+<Text Visualization, connectedTo, Natural Language Processing>
+<Text Visualization, connectedTo, Relationship Extraction>
diff --git a/test/graphviz/graph_hard/graphviz_331.txt b/test/graphviz/graph_hard/graphviz_331.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3817c5d5987c65eb9c98f38cbe6b9a8cbed4d33f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_331.txt
@@ -0,0 +1,33 @@
+<Aerospace Digital Twins, governs, Risk Assessment>
+<Anomaly Detection, connectedTo, IoT Data Ingestion>
+<Anomaly Detection, partOf, Anomaly Detection>
+<Data Security for Digital Twins, connectedTo, Remote Control Capabilities>
+<Data Security for Digital Twins, partOf, Data Security for Digital Twins>
+<Design Validation, connectedTo, Data Security for Digital Twins>
+<Design Validation, partOf, Design Validation>
+<Digital Twin Lifecycle Management, connectedTo, Edge Computing for Twins>
+<Digital Twin Lifecycle Management, partOf, Digital Twin Lifecycle Management>
+<Edge Computing for Twins, connectedTo, Anomaly Detection>
+<Edge Computing for Twins, partOf, Edge Computing for Twins>
+<Enterprise Asset Management Integration, connectedTo, Digital Twin Lifecycle Management>
+<Enterprise Asset Management Integration, connectedTo, Sensor Data Integration>
+<IoT Data Ingestion, connectedTo, Aerospace Digital Twins>
+<Model Creation, connectedTo, Aerospace Digital Twins>
+<Model Creation, connectedTo, System Integration Architecture>
+<Model Creation, designs, Remote Control Capabilities>
+<Real_Time Data Streaming, connectedTo, Model Creation>
+<Real_Time Data Streaming, connectedTo, Remote Control Capabilities>
+<Real_Time Data Streaming, connectedTo, Simulation and Prediction>
+<Remote Control Capabilities, connectedTo, Enterprise Asset Management Integration>
+<Sensor Data Integration, connectedTo, Aerospace Digital Twins>
+<Sensor Data Integration, connectedTo, IoT Data Ingestion>
+<Simulation and Prediction, connectedTo, Design Validation>
+<Simulation and Prediction, partOf, Simulation and Prediction>
+<System Integration Architecture, connectedTo, IoT Data Ingestion>
+<System Integration Architecture, connectedTo, Remote Control Capabilities>
+<System Integration Architecture, deploys, Enterprise Asset Management Integration>
+<Virtual Reality Interaction, connectedTo, Aerospace Digital Twins>
+<Virtual Reality Interaction, connectedTo, Model Creation>
+<Virtual Reality Interaction, connectedTo, Real_Time Data Streaming>
+<Virtual Reality Interaction, connectedTo, Remote Control Capabilities>
+<Virtual Reality Interaction, troubleshoots, Sensor Data Integration>
diff --git a/test/graphviz/graph_hard/graphviz_332.txt b/test/graphviz/graph_hard/graphviz_332.txt
new file mode 100644
index 0000000000000000000000000000000000000000..aaa1959f434960227797e63e8df7e9ca63c182cb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_332.txt
@@ -0,0 +1,37 @@
+<AI or ML Model Integration, connectedTo, IoT Data Ingestion>
+<Asset Optimization, connectedTo, AI or ML Model Integration>
+<Augmented Reality Visualization, connectedTo, Historical Data Analysis>
+<Augmented Reality Visualization, partOf, Augmented Reality Visualization>
+<Building Information Modeling Integration, connectedTo, Virtual Reality Interaction>
+<Condition Monitoring, connectedTo, Maintenance Scheduling>
+<Condition Monitoring, partOf, Condition Monitoring>
+<Digital Twin Lifecycle Management, connectedTo, AI or ML Model Integration>
+<Digital Twin Lifecycle Management, connectedTo, Sensor Data Integration>
+<Energy Consumption Optimization, connectedTo, Asset Optimization>
+<Enterprise Asset Management Integration, connectedTo, Smart City Planning>
+<Enterprise Asset Management Integration, partOf, Enterprise Asset Management Integration>
+<Historical Data Analysis, connectedTo, AI or ML Model Integration>
+<Historical Data Analysis, partOf, Historical Data Analysis>
+<Interoperability Standards, connectedTo, Digital Twin Lifecycle Management>
+<IoT Data Ingestion, connectedTo, Risk Assessment>
+<Maintenance Scheduling, connectedTo, Smart Manufacturing>
+<Maintenance Scheduling, connectedTo, What_If Scenario Analysis>
+<Model Creation, connectedTo, Enterprise Asset Management Integration>
+<Model Creation, partOf, Model Creation>
+<Model Creation, risks_mitigates, IoT Data Ingestion>
+<Remote Control Capabilities, AR or VR_enables, IoT Data Ingestion>
+<Remote Control Capabilities, connectedTo, AI or ML Model Integration>
+<Remote Control Capabilities, connectedTo, Energy Consumption Optimization>
+<Remote Control Capabilities, connectedTo, Model Creation>
+<Risk Assessment, connectedTo, Maintenance Scheduling>
+<Risk Assessment, connectedTo, Smart Manufacturing>
+<Risk Assessment, connectedTo, Virtual Reality Interaction>
+<Sensor Data Integration, connectedTo, AI or ML Model Integration>
+<Sensor Data Integration, connectedTo, Remote Control Capabilities>
+<Smart City Planning, connectedTo, Condition Monitoring>
+<Smart City Planning, partOf, Smart City Planning>
+<Smart Manufacturing, connectedTo, System Integration Architecture>
+<System Integration Architecture, connectedTo, Building Information Modeling Integration>
+<Virtual Reality Interaction, connectedTo, Cyber_Physical Systems>
+<What_If Scenario Analysis, connectedTo, Augmented Reality Visualization>
+<What_If Scenario Analysis, partOf, What_If Scenario Analysis>
diff --git a/test/graphviz/graph_hard/graphviz_333.dot b/test/graphviz/graph_hard/graphviz_333.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2b95271766620b3d503bca6414c872dc4b1ce0f5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_333.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=RL
+	N0 [label="Interoperability Standards" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Real_Time Data Streaming" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N2 [label="Sensor Data Integration" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N3 [label="What_If Scenario Analysis" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N4 [label="Smart City Planning" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N5 [label="Asset Optimization" color="#F7BEE0" fillcolor="#FAEBF3" shape=octagon style=filled]
+	N6 [label="IoT Data Ingestion" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N7 [label="Virtual Prototyping" color="#FFB74D" fillcolor="#FFF3E0" shape=oval style=filled]
+	N8 [label="Aerospace Digital Twins" color="#F7BEE0" fillcolor="#FAEBF3" shape=oval style=filled]
+	N9 [label="Model Creation" color="#FFB74D" fillcolor="#FFF3E0" shape=oval style=filled]
+	N10 [label="Virtual Reality Interaction" color="#F7BEE0" fillcolor="#FAEBF3" shape=plaintext style=filled]
+	N11 [label="Operational Planning" color="#FFB74D" fillcolor="#FFF3E0" shape=octagon style=filled]
+	N12 [label="Augmented Reality Visualization" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N13 [label="Data Security for Digital Twins" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N14 [label="Lifecycle Management" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Simulation and Prediction" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Simulation Platform Development" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+		nest0_1 [label="Smart Manufacturing" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Design Validation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Maintenance Scheduling" color="#FFB74D" fillcolor="#FFF3E0" shape=octagon style=filled]
+		nest1_1 [label="Scalability of Models" color="#F7BEE0" fillcolor="#FAEBF3" shape=plaintext style=filled]
+		nest1_2 [label="Digital Twin Lifecycle Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [label=performance_tracks color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=troubleshoots color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=upgrades color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N6 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N11 [label=deploys color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_334.txt b/test/graphviz/graph_hard/graphviz_334.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e630c785c2d381ef3f1b46de984f209441c43e8e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_334.txt
@@ -0,0 +1,39 @@
+<API Automation, connectedTo, Finance Process Automation>
+<Audit Trail for Automation, connectedTo, Automated Testing>
+<Automated Data Validation, connectedTo, HR Process Automation>
+<Automated Data Validation, partOf, Automated Data Validation>
+<Automated Testing, connectedTo, Change Management for Automation>
+<Automated Testing, connectedTo, Natural Language Processing for Automation>
+<Automated Testing, connectedTo, Process Mapping>
+<Automated Testing, connectedTo, Scalability of Automation>
+<Change Management for Automation, connectedTo, Process Mapping>
+<Compliance in Automation, connectedTo, Optical Character Recognition for Automation>
+<Finance Process Automation, connectedTo, Compliance in Automation>
+<HR Process Automation, connectedTo, IT Operations Automation>
+<HR Process Automation, partOf, HR Process Automation>
+<Integration with Existing Systems, connectedTo, Audit Trail for Automation>
+<Intelligent Automation, connectedTo, Integration with Existing Systems>
+<Low_Code or No_Code Automation, connectedTo, Change Management for Automation>
+<Low_Code or No_Code Automation, connectedTo, IT Operations Automation>
+<Low_Code or No_Code Automation, connectedTo, Process Mapping>
+<Natural Language Processing for Automation, connectedTo, IT Operations Automation>
+<Optical Character Recognition for Automation, connectedTo, Performance Monitoring of Bots>
+<Optical Character Recognition for Automation, connectedTo, Process Mining>
+<Performance Monitoring of Bots, connectedTo, Scripting for Automation>
+<Performance Monitoring of Bots, partOf, Performance Monitoring of Bots>
+<Process Mapping, connectedTo, Natural Language Processing for Automation>
+<Process Mining, connectedTo, Supply Chain Automation>
+<Report Generation Automation, connectedTo, Finance Process Automation>
+<Report Generation Automation, connectedTo, Workflow Automation Platforms>
+<Scalability of Automation, connectedTo, Change Management for Automation>
+<Scalability of Automation, connectedTo, Low_Code or No_Code Automation>
+<Scalability of Automation, connectedTo, Natural Language Processing for Automation>
+<Scalability of Automation, connectedTo, Process Mapping>
+<Scripting for Automation, connectedTo, Security for Automation Bots>
+<Scripting for Automation, partOf, Scripting for Automation>
+<Security for Automation Bots, connectedTo, Optical Character Recognition for Automation>
+<Security for Automation Bots, partOf, Security for Automation Bots>
+<Supply Chain Automation, connectedTo, Automated Data Validation>
+<Supply Chain Automation, connectedTo, Intelligent Automation>
+<Workflow Automation Platforms, connectedTo, API Automation>
+<Workflow Automation Platforms, connectedTo, Finance Process Automation>
diff --git a/test/graphviz/graph_hard/graphviz_335.dot b/test/graphviz/graph_hard/graphviz_335.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ee03c633be1b618718dfa299ed0040158330fc3f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_335.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=TD
+	N0 [label="Robotic Process Automation Implementation" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N1 [label="Intelligent Automation" color="#FF8A65" fillcolor="#FBE9E7" shape=diamond style=filled]
+	N2 [label="Natural Language Processing for Automation" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N3 [label="Automated Testing" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+	N4 [label="Supply Chain Automation" color="#FFCC7A" fillcolor="#FFF6D9" shape=Mdiamond style=filled]
+	N5 [label="Customer Service Automation" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N6 [label="Error Handling in Automation" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N7 [label="Report Generation Automation" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N8 [label="Process Mining" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N9 [label="Performance Monitoring of Bots" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N10 [label="Task Automation" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N11 [label="HR Process Automation" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N12 [label="Scalability of Automation" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N13 [label="Low_Code or No_Code Automation" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	S0 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Integration with Existing Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Compliance in Automation" color="#FFCC7A" fillcolor="#FFF6D9" shape=parallelogram style=filled]
+		nest0_1 [label="IT Operations Automation" color="#A1887F" fillcolor="#EFEBE9" shape=octagon style=filled]
+		nest0_2 [label="Automation Opportunity Identification" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+		nest0_3 [label="Decision Automation" color="#FF8A65" fillcolor="#FBE9E7" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Scripting for Automation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Chatbot Integration" color="#FFCC7A" fillcolor="#FFF6D9" shape=folder style=filled]
+		nest1_1 [label="API Automation" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+		nest1_2 [label="Document Processing Automation" color="#FF8A65" fillcolor="#FBE9E7" shape=plaintext style=filled]
+		nest1_3 [label="Finance Process Automation" color="#FFCC7A" fillcolor="#FFF6D9" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=accelerates_operations color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=tasks_handles color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=data_processes color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=approvals_manages color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N4 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S2 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [label=trains color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_335.txt b/test/graphviz/graph_hard/graphviz_335.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a76132f0dcd0b6c5e5d6aa0f3fe9322b582ba0a1
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_335.txt
@@ -0,0 +1,45 @@
+<API Automation, connectedTo, Document Processing Automation>
+<API Automation, partOf, API Automation>
+<Automated Testing, connectedTo, Customer Service Automation>
+<Automated Testing, data_processes, Supply Chain Automation>
+<Automation Opportunity Identification, connectedTo, Decision Automation>
+<Automation Opportunity Identification, partOf, Automation Opportunity Identification>
+<Chatbot Integration, connectedTo, API Automation>
+<Chatbot Integration, partOf, Chatbot Integration>
+<Compliance in Automation, connectedTo, IT Operations Automation>
+<Compliance in Automation, partOf, Compliance in Automation>
+<Customer Service Automation, connectedTo, Chatbot Integration>
+<Customer Service Automation, connectedTo, Error Handling in Automation>
+<Customer Service Automation, connectedTo, Performance Monitoring of Bots>
+<Customer Service Automation, connectedTo, Report Generation Automation>
+<Customer Service Automation, connectedTo, Scalability of Automation>
+<Customer Service Automation, connectedTo, Task Automation>
+<Decision Automation, connectedTo, Intelligent Automation>
+<Decision Automation, partOf, Decision Automation>
+<Document Processing Automation, connectedTo, Finance Process Automation>
+<Document Processing Automation, partOf, Document Processing Automation>
+<Error Handling in Automation, connectedTo, Report Generation Automation>
+<Finance Process Automation, connectedTo, Supply Chain Automation>
+<Finance Process Automation, partOf, Finance Process Automation>
+<HR Process Automation, connectedTo, Scalability of Automation>
+<IT Operations Automation, connectedTo, Automation Opportunity Identification>
+<IT Operations Automation, partOf, IT Operations Automation>
+<Intelligent Automation, connectedTo, Customer Service Automation>
+<Intelligent Automation, tasks_handles, Natural Language Processing for Automation>
+<Natural Language Processing for Automation, connectedTo, Automated Testing>
+<Natural Language Processing for Automation, connectedTo, Customer Service Automation>
+<Natural Language Processing for Automation, trains, Customer Service Automation>
+<Performance Monitoring of Bots, connectedTo, Compliance in Automation>
+<Performance Monitoring of Bots, connectedTo, Task Automation>
+<Process Mining, connectedTo, Low_Code or No_Code Automation>
+<Process Mining, connectedTo, Performance Monitoring of Bots>
+<Process Mining, connectedTo, Scalability of Automation>
+<Report Generation Automation, approvals_manages, Process Mining>
+<Robotic Process Automation Implementation, accelerates_operations, Intelligent Automation>
+<Scalability of Automation, connectedTo, Low_Code or No_Code Automation>
+<Supply Chain Automation, connectedTo, Customer Service Automation>
+<Supply Chain Automation, connectedTo, HR Process Automation>
+<Supply Chain Automation, connectedTo, Performance Monitoring of Bots>
+<Supply Chain Automation, connectedTo, Process Mining>
+<Supply Chain Automation, connectedTo, Report Generation Automation>
+<Task Automation, connectedTo, HR Process Automation>
diff --git a/test/graphviz/graph_hard/graphviz_336.dot b/test/graphviz/graph_hard/graphviz_336.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3340711f10e121e8eccb4593fe0763107650c3f4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_336.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=RL
+	N0 [label="Automated Testing" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N1 [label="Audit Trail for Automation" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N2 [label="Process Mining" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N3 [label="Orchestration of Processes" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N4 [label="Customer Service Automation" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N5 [label="Email Automation" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N6 [label="Scalability of Automation" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N7 [label=Hyperautomation color="#FFF9AE" fillcolor="#FFFCE6" shape=octagon style=filled]
+	N8 [label="Business Rule Engines" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N9 [label="Return on Investment Calculation" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N10 [label="Security for Automation Bots" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N11 [label="Automation Opportunity Identification" color="#FFF9AE" fillcolor="#FFFCE6" shape=octagon style=filled]
+	N12 [label="Chatbot Integration" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N13 [label="Low_Code or No_Code Automation" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N14 [label="Workflow Automation Platforms" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	S0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Scripting for Automation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="HR Process Automation" color="#FFF9AE" fillcolor="#FFFCE6" shape=parallelogram style=filled]
+		nest0_1 [label="Business Process Management" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Change Management for Automation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Finance Process Automation" color="#FFF9AE" fillcolor="#FFFCE6" shape=plaintext style=filled]
+		nest1_1 [label="IT Operations Automation" color="#FFF9AE" fillcolor="#FFFCE6" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=notifications_sends color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=integrates_systems color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=remedies_applies color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=AI_applies color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [label=trains color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [label=advises color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_336.txt b/test/graphviz/graph_hard/graphviz_336.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2800489f993b92902f39144d1a56e2d42afc6bae
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_336.txt
@@ -0,0 +1,35 @@
+<Audit Trail for Automation, connectedTo, Orchestration of Processes>
+<Audit Trail for Automation, connectedTo, Process Mining>
+<Automated Testing, connectedTo, Orchestration of Processes>
+<Automated Testing, connectedTo, Return on Investment Calculation>
+<Automated Testing, connectedTo, Scalability of Automation>
+<Automated Testing, notifications_sends, Audit Trail for Automation>
+<Automated Testing, trains, Process Mining>
+<Automation Opportunity Identification, connectedTo, Chatbot Integration>
+<Business Process Management, connectedTo, Process Mining>
+<Business Process Management, partOf, Business Process Management>
+<Business Rule Engines, AI_applies, Return on Investment Calculation>
+<Chatbot Integration, connectedTo, Low_Code or No_Code Automation>
+<Customer Service Automation, connectedTo, Return on Investment Calculation>
+<Customer Service Automation, remedies_applies, Email Automation>
+<Email Automation, connectedTo, Return on Investment Calculation>
+<Email Automation, connectedTo, Scalability of Automation>
+<Finance Process Automation, connectedTo, IT Operations Automation>
+<Finance Process Automation, partOf, Finance Process Automation>
+<HR Process Automation, connectedTo, Business Process Management>
+<HR Process Automation, partOf, HR Process Automation>
+<Hyperautomation, advises, Automation Opportunity Identification>
+<Hyperautomation, connectedTo, Business Rule Engines>
+<Hyperautomation, connectedTo, HR Process Automation>
+<Hyperautomation, connectedTo, Low_Code or No_Code Automation>
+<Hyperautomation, connectedTo, Security for Automation Bots>
+<Hyperautomation, connectedTo, Workflow Automation Platforms>
+<IT Operations Automation, connectedTo, Scalability of Automation>
+<IT Operations Automation, partOf, IT Operations Automation>
+<Low_Code or No_Code Automation, connectedTo, Workflow Automation Platforms>
+<Orchestration of Processes, integrates_systems, Customer Service Automation>
+<Process Mining, connectedTo, Finance Process Automation>
+<Process Mining, connectedTo, Orchestration of Processes>
+<Return on Investment Calculation, connectedTo, Security for Automation Bots>
+<Scalability of Automation, connectedTo, Hyperautomation>
+<Security for Automation Bots, connectedTo, Automation Opportunity Identification>
diff --git a/test/graphviz/graph_hard/graphviz_338.dot b/test/graphviz/graph_hard/graphviz_338.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b0f9b70397ef49c84fe518f5096b14238c088d15
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_338.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=TD
+	N0 [label="Hardware Quality Testing" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Product Testing" color="#D2D2D2" fillcolor="#F0F0F0" shape=plaintext style=filled]
+	N2 [label="X_ray Inspection" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+	N3 [label="Sampling Plans" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N4 [label="Software Quality Assurance" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N5 [label="Regulatory Compliance for Quality" color="#7E57C2" fillcolor="#D1C4E9" shape=folder style=filled]
+	N6 [label="Quality Assurance" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N7 [label="Non_Destructive Testing" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N8 [label="Component Inspection" color="#D2D2D2" fillcolor="#F0F0F0" shape=parallelogram style=filled]
+	N9 [label="Food Safety Quality Control" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N10 [label=Metrology color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N11 [label="Lean Principles in Quality" color="#4285F4" fillcolor="#D0E0F8" shape=Mdiamond style=filled]
+	N12 [label="Quality Data Analysis" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N13 [label="ISO Certification" color="#4285F4" fillcolor="#D0E0F8" shape=parallelogram style=filled]
+	N14 [label="Risk_Based Quality Control" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N15 [label="Quality Planning" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	S0 [label="" color="#D2D2D2" fillcolor="#F0F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#D2D2D2" fillcolor="#F0F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Supplier Quality Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Six Sigma Methodologies" color="#7E57C2" fillcolor="#D1C4E9" shape=plaintext style=filled]
+		nest0_1 [label="Calibration of Instruments" color="#4285F4" fillcolor="#D0E0F8" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Total Quality Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Trend Analysis" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+		nest1_1 [label="Measurement System Analysis" color="#4285F4" fillcolor="#D0E0F8" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=corrective_actions_implements color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=customer_satisfaction_ensures color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N10 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N13 -> nest1_0 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N8 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S0 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N0 -> S1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N12 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [label=processes_defines color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N14 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_338.txt b/test/graphviz/graph_hard/graphviz_338.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ba4229583c7f58d02089ae7e2d09bb21a6276360
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_338.txt
@@ -0,0 +1,35 @@
+<Calibration of Instruments, connectedTo, Metrology>
+<Calibration of Instruments, partOf, Calibration of Instruments>
+<Component Inspection, connectedTo, Food Safety Quality Control>
+<Food Safety Quality Control, connectedTo, ISO Certification>
+<Food Safety Quality Control, connectedTo, Metrology>
+<Food Safety Quality Control, connectedTo, Quality Data Analysis>
+<Food Safety Quality Control, connectedTo, Quality Planning>
+<Hardware Quality Testing, connectedTo, Product Testing>
+<Hardware Quality Testing, connectedTo, Quality Planning>
+<Hardware Quality Testing, connectedTo, Regulatory Compliance for Quality>
+<Hardware Quality Testing, connectedTo, Sampling Plans>
+<ISO Certification, connectedTo, Risk_Based Quality Control>
+<ISO Certification, connectedTo, Trend Analysis>
+<Lean Principles in Quality, connectedTo, Quality Data Analysis>
+<Measurement System Analysis, connectedTo, Component Inspection>
+<Measurement System Analysis, partOf, Measurement System Analysis>
+<Metrology, connectedTo, Lean Principles in Quality>
+<Metrology, connectedTo, Six Sigma Methodologies>
+<Non_Destructive Testing, connectedTo, Component Inspection>
+<Product Testing, connectedTo, Sampling Plans>
+<Product Testing, connectedTo, X_ray Inspection>
+<Product Testing, processes_defines, Risk_Based Quality Control>
+<Quality Assurance, connectedTo, Non_Destructive Testing>
+<Quality Data Analysis, connectedTo, Risk_Based Quality Control>
+<Quality Data Analysis, customer_satisfaction_ensures, ISO Certification>
+<Regulatory Compliance for Quality, corrective_actions_implements, Quality Assurance>
+<Risk_Based Quality Control, connectedTo, Quality Planning>
+<Sampling Plans, connectedTo, Risk_Based Quality Control>
+<Sampling Plans, connectedTo, Software Quality Assurance>
+<Six Sigma Methodologies, connectedTo, Calibration of Instruments>
+<Six Sigma Methodologies, partOf, Six Sigma Methodologies>
+<Software Quality Assurance, connectedTo, Regulatory Compliance for Quality>
+<Trend Analysis, connectedTo, Measurement System Analysis>
+<Trend Analysis, partOf, Trend Analysis>
+<X_ray Inspection, connectedTo, Sampling Plans>
diff --git a/test/graphviz/graph_hard/graphviz_34.dot b/test/graphviz/graph_hard/graphviz_34.dot
new file mode 100644
index 0000000000000000000000000000000000000000..55ba1a49200cca4e61c03c3f17b3f624b57f5790
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_34.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=LR
+	N0 [label="Currency Exchange" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N1 [label="Rental Car Pickup" color="#A188DB" fillcolor="#DED7F0" shape=plaintext style=filled]
+	N2 [label="Adventure Sports Booking" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+	N3 [label="Travel Advisory Updates" color="#A188DB" fillcolor="#DED7F0" shape=diamond style=filled]
+	N4 [label="Duty_Free Shopping" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N5 [label="Loyalty Program Enrollment" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N6 [label="Local Transport" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N7 [label="Itinerary Planning" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+	N8 [label="Flight Booking" color="#A188DB" fillcolor="#DED7F0" shape=plaintext style=filled]
+	N9 [label="Emergency Assistance" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	N10 [label="Visa Application" color="#A188DB" fillcolor="#DED7F0" shape=octagon style=filled]
+	N11 [label="Airport Transfer" color="#A1D7CD" fillcolor="#EDF5F3" shape=folder style=filled]
+	N12 [label="Tour Guide Assignment" color="#AED581" fillcolor="#F0F4C3" shape=parallelogram style=filled]
+	N13 [label="Travel Blog Creation" color="#A1D7CD" fillcolor="#EDF5F3" shape=Mdiamond style=filled]
+	N14 [label="Cultural Immersion Program" color="#A1D7CD" fillcolor="#EDF5F3" shape=plaintext style=filled]
+	N15 [label="Lost and Found Service" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N16 [label="Passport Renewal Assistance" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	S0 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Cruise Ship Boarding" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Destination Selection" color="#A1D7CD" fillcolor="#EDF5F3" shape=octagon style=filled]
+		nest0_1 [label="Hotel Check_in" color="#A1D7CD" fillcolor="#EDF5F3" shape=diamond style=filled]
+		nest0_2 [label="Travel Insurance" color="#A188DB" fillcolor="#DED7F0" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Tourist Information Desk" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Baggage Handling" color="#A188DB" fillcolor="#DED7F0" shape=Mdiamond style=filled]
+		nest1_1 [label="Trip Sharing" color="#A188DB" fillcolor="#DED7F0" shape=Mdiamond style=filled]
+		nest1_2 [label="Concert Ticketing" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=reserves color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=entertains color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=accommodates color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=reviews color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [label=secures color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest0_0 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N13 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N15 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N8 -> S0 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [label=documents color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S2 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	M0 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> M1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N13 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_34.txt b/test/graphviz/graph_hard/graphviz_34.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cba988d40f528bda51125f4794318fc2e4457c38
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_34.txt
@@ -0,0 +1,40 @@
+<Adventure Sports Booking, connectedTo, Travel Advisory Updates>
+<Airport Transfer, connectedTo, Tour Guide Assignment>
+<Airport Transfer, connectedTo, Travel Blog Creation>
+<Baggage Handling, connectedTo, Trip Sharing>
+<Baggage Handling, partOf, Baggage Handling>
+<Concert Ticketing, connectedTo, Lost and Found Service>
+<Concert Ticketing, partOf, Concert Ticketing>
+<Cultural Immersion Program, connectedTo, Lost and Found Service>
+<Currency Exchange, connectedTo, Lost and Found Service>
+<Currency Exchange, connectedTo, Rental Car Pickup>
+<Destination Selection, connectedTo, Hotel Check_in>
+<Destination Selection, partOf, Destination Selection>
+<Duty_Free Shopping, connectedTo, Loyalty Program Enrollment>
+<Emergency Assistance, connectedTo, Cultural Immersion Program>
+<Emergency Assistance, connectedTo, Travel Blog Creation>
+<Emergency Assistance, connectedTo, Visa Application>
+<Flight Booking, accommodates, Emergency Assistance>
+<Flight Booking, connectedTo, Travel Blog Creation>
+<Flight Booking, documents, Visa Application>
+<Hotel Check_in, connectedTo, Travel Insurance>
+<Hotel Check_in, partOf, Hotel Check_in>
+<Itinerary Planning, connectedTo, Airport Transfer>
+<Itinerary Planning, connectedTo, Tour Guide Assignment>
+<Itinerary Planning, entertains, Flight Booking>
+<Local Transport, connectedTo, Itinerary Planning>
+<Lost and Found Service, secures, Passport Renewal Assistance>
+<Loyalty Program Enrollment, connectedTo, Baggage Handling>
+<Loyalty Program Enrollment, connectedTo, Local Transport>
+<Rental Car Pickup, connectedTo, Adventure Sports Booking>
+<Rental Car Pickup, connectedTo, Travel Blog Creation>
+<Tour Guide Assignment, reviews, Travel Blog Creation>
+<Travel Advisory Updates, connectedTo, Duty_Free Shopping>
+<Travel Advisory Updates, connectedTo, Lost and Found Service>
+<Travel Blog Creation, connectedTo, Cultural Immersion Program>
+<Travel Insurance, connectedTo, Travel Blog Creation>
+<Travel Insurance, partOf, Travel Insurance>
+<Trip Sharing, partOf, Trip Sharing>
+<Trip Sharing, reserves, Concert Ticketing>
+<Visa Application, connectedTo, Airport Transfer>
+<Visa Application, connectedTo, Destination Selection>
diff --git a/test/graphviz/graph_hard/graphviz_340.dot b/test/graphviz/graph_hard/graphviz_340.dot
new file mode 100644
index 0000000000000000000000000000000000000000..80a047fd73e38a4ec403de0f031b3160f5d3e79d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_340.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=RL
+	N0 [label="Manufacturing Operations" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N1 [label="Compliance Reporting" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N2 [label="User Access Management" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N3 [label="Human Capital Management" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N4 [label="Cloud ERP Deployment" color="#FFC085" fillcolor="#FFDAB9" shape=folder style=filled]
+	N5 [label="Hybrid ERP Models" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+	N6 [label="Reporting and Analytics" color="#FFC085" fillcolor="#FFDAB9" shape=folder style=filled]
+	N7 [label="Inventory Management" color="#9575CD" fillcolor="#EDE7F6" shape=folder style=filled]
+	N8 [label="AI or ML in ERP" color="#9575CD" fillcolor="#EDE7F6" shape=plaintext style=filled]
+	N9 [label="User Acceptance Testing" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N10 [label="Workflow Automation in ERP" color="#81C784" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N11 [label="Master Data Management" color="#FFC085" fillcolor="#FFDAB9" shape=oval style=filled]
+	N12 [label="Mobile ERP Access" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N13 [label="Procurement Management" color="#FFC085" fillcolor="#FFDAB9" shape=oval style=filled]
+	N14 [label="Project Management" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N15 [label="Sales and Distribution" color="#81C784" fillcolor="#F1F8E9" shape=plaintext style=filled]
+	N16 [label="Module Implementation" color="#FFC085" fillcolor="#FFDAB9" shape=octagon style=filled]
+	N17 [label="Implementation Roadmap Development" color="#81C784" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N18 [label="Post_Go_Live Support" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	S0 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#81C784" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#81C784" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Security Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Performance Optimization" color="#9575CD" fillcolor="#EDE7F6" shape=oval style=filled]
+		nest0_1 [label="On_Premise ERP Solutions" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="User Training" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="ERP Consulting" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+		nest1_1 [label="Data Migration" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=integrates color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N13 -> nest0_0 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N6 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N18 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S1 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [label=customer_relations_manages color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N9 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M2 [label=budgets color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N11 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_340.txt b/test/graphviz/graph_hard/graphviz_340.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e5d7ee074d70111c7dd97645a2baf14d59fb46eb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_340.txt
@@ -0,0 +1,44 @@
+<AI or ML in ERP, connectedTo, User Acceptance Testing>
+<Cloud ERP Deployment, connectedTo, Hybrid ERP Models>
+<Cloud ERP Deployment, connectedTo, Inventory Management>
+<Compliance Reporting, connectedTo, Inventory Management>
+<Compliance Reporting, connectedTo, User Access Management>
+<Data Migration, connectedTo, Mobile ERP Access>
+<Data Migration, partOf, Data Migration>
+<ERP Consulting, connectedTo, Data Migration>
+<ERP Consulting, partOf, ERP Consulting>
+<Human Capital Management, connectedTo, Cloud ERP Deployment>
+<Hybrid ERP Models, connectedTo, Master Data Management>
+<Hybrid ERP Models, connectedTo, Reporting and Analytics>
+<Hybrid ERP Models, connectedTo, User Acceptance Testing>
+<Hybrid ERP Models, customer_relations_manages, Inventory Management>
+<Implementation Roadmap Development, connectedTo, Post_Go_Live Support>
+<Inventory Management, connectedTo, User Acceptance Testing>
+<Inventory Management, integrates, AI or ML in ERP>
+<Manufacturing Operations, connectedTo, Compliance Reporting>
+<Manufacturing Operations, connectedTo, Master Data Management>
+<Master Data Management, connectedTo, Mobile ERP Access>
+<Mobile ERP Access, connectedTo, Procurement Management>
+<Module Implementation, connectedTo, Implementation Roadmap Development>
+<On_Premise ERP Solutions, connectedTo, Reporting and Analytics>
+<On_Premise ERP Solutions, partOf, On_Premise ERP Solutions>
+<Performance Optimization, connectedTo, On_Premise ERP Solutions>
+<Performance Optimization, partOf, Performance Optimization>
+<Procurement Management, connectedTo, Module Implementation>
+<Procurement Management, connectedTo, Performance Optimization>
+<Procurement Management, connectedTo, Post_Go_Live Support>
+<Procurement Management, connectedTo, Project Management>
+<Procurement Management, connectedTo, Sales and Distribution>
+<Project Management, connectedTo, Sales and Distribution>
+<Reporting and Analytics, budgets, Master Data Management>
+<Reporting and Analytics, connectedTo, Inventory Management>
+<Sales and Distribution, connectedTo, Module Implementation>
+<User Acceptance Testing, connectedTo, Master Data Management>
+<User Acceptance Testing, connectedTo, Workflow Automation in ERP>
+<User Access Management, connectedTo, Human Capital Management>
+<User Access Management, connectedTo, Hybrid ERP Models>
+<User Access Management, connectedTo, Post_Go_Live Support>
+<User Access Management, connectedTo, Sales and Distribution>
+<User Access Management, connectedTo, User Acceptance Testing>
+<Workflow Automation in ERP, connectedTo, ERP Consulting>
+<Workflow Automation in ERP, connectedTo, Master Data Management>
diff --git a/test/graphviz/graph_hard/graphviz_343.dot b/test/graphviz/graph_hard/graphviz_343.dot
new file mode 100644
index 0000000000000000000000000000000000000000..54c67dbe77c3df5d3440d442b774ba005990c9ca
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_343.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=RL
+	N0 [label="Livestock Feeding Automation" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N1 [label="Farm Management Dashboards" color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+	N2 [label="Satellite Imaging" color="#5C6BC0" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N3 [label="Automated Irrigation" color="#5C6BC0" fillcolor="#E8EAF6" shape=oval style=filled]
+	N4 [label="Farm Management Software" color="#2196F3" fillcolor="#BBDEFB" shape=octagon style=filled]
+	N5 [label="Carbon Farming Initiatives" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N6 [label="Digital Soil Mapping" color="#5C6BC0" fillcolor="#E8EAF6" shape=octagon style=filled]
+	N7 [label="Yield Mapping" color="#2196F3" fillcolor="#BBDEFB" shape=Mdiamond style=filled]
+	N8 [label="Smart Livestock Monitoring" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+	N9 [label="Geographic Information Systems for Farms" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N10 [label="Aquaculture Monitoring" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N11 [label="Predictive Analytics for Harvest" color="#92C79A" fillcolor="#E8F0EA" shape=Mdiamond style=filled]
+	N12 [label="Supply Chain Traceability" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N13 [label="Forestry Management with Digital Tools" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	S0 [label="" color="#92C79A" fillcolor="#E8F0EA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Farm Robotics" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Sensor Deployment" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+		nest0_1 [label="Precision Farming" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+		nest0_2 [label="Automated Farm Machinery" color="#92C79A" fillcolor="#E8F0EA" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="IoT in Agriculture" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Variable Rate Application" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+		nest1_1 [label="Farm Data Integration" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N9 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N6 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	nest0_0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_344.txt b/test/graphviz/graph_hard/graphviz_344.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e15094dcc95750e75b28f63dc90ac30c1836dfcd
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_344.txt
@@ -0,0 +1,38 @@
+<AI for Crop Disease Detection, connectedTo, Smart Greenhouses>
+<Automated Farm Machinery, connectedTo, Forestry Management with Digital Tools>
+<Automated Irrigation, connectedTo, Crop Health Monitoring>
+<Automated Irrigation, partOf, Automated Irrigation>
+<Blockchain for Agri_Supply Chain, connectedTo, Automated Farm Machinery>
+<Carbon Farming Initiatives, connectedTo, Market Price Forecasting>
+<Crop Health Monitoring, connectedTo, Farm Data Integration>
+<Crop Health Monitoring, partOf, Crop Health Monitoring>
+<Crop Insurance Assessment, connectedTo, Smart Greenhouses>
+<Crop Insurance Assessment, connectedTo, Variable Rate Application>
+<Digital Soil Mapping, connectedTo, Farm Labor Management Software>
+<Farm Data Integration, connectedTo, Blockchain for Agri_Supply Chain>
+<Farm Labor Management Software, connectedTo, Resource Optimization>
+<Farm Management Software, connectedTo, Automated Irrigation>
+<Farm Management Software, connectedTo, Smart Livestock Monitoring>
+<Farm Management Software, connectedTo, Vertical Farming Technology>
+<Farm Management Software, crops_grows, Weather Station Data Integration>
+<Farm Management Software, visualizes, Herd Health Monitoring>
+<Farm Robotics, connectedTo, Predictive Analytics for Harvest>
+<Farm Robotics, connectedTo, Smart Greenhouses>
+<Forestry Management with Digital Tools, connectedTo, Farm Management Software>
+<Herd Health Monitoring, connectedTo, Weather Station Data Integration>
+<IoT in Agriculture, connectedTo, Forestry Management with Digital Tools>
+<IoT in Agriculture, partOf, IoT in Agriculture>
+<Market Price Forecasting, connectedTo, Sensor Deployment>
+<Market Price Forecasting, connectedTo, Sustainability Metrics Tracking>
+<Predictive Analytics for Harvest, connectedTo, Digital Soil Mapping>
+<Predictive Analytics for Harvest, connectedTo, Smart Greenhouses>
+<Resource Optimization, connectedTo, Crop Insurance Assessment>
+<Sensor Deployment, connectedTo, IoT in Agriculture>
+<Sensor Deployment, partOf, Sensor Deployment>
+<Smart Greenhouses, connectedTo, Farm Data Integration>
+<Smart Livestock Monitoring, connectedTo, Vertical Farming Technology>
+<Variable Rate Application, connectedTo, AI for Crop Disease Detection>
+<Vertical Farming Technology, connectedTo, Carbon Farming Initiatives>
+<Vertical Farming Technology, connectedTo, Herd Health Monitoring>
+<Vertical Farming Technology, connectedTo, Sustainability Metrics Tracking>
+<Weather Station Data Integration, connectedTo, Carbon Farming Initiatives>
diff --git a/test/graphviz/graph_hard/graphviz_345.txt b/test/graphviz/graph_hard/graphviz_345.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8235d1bf40d995b3119b2d97efc72c620ed42378
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_345.txt
@@ -0,0 +1,39 @@
+<Aquaculture Monitoring, connectedTo, Supply Chain Traceability>
+<Aquaculture Monitoring, connectedTo, Weather Station Data Integration>
+<Blockchain for Agri_Supply Chain, connectedTo, Connectivity Solutions>
+<Blockchain for Agri_Supply Chain, partOf, Blockchain for Agri_Supply Chain>
+<Connectivity Solutions, connectedTo, Geographic Information Systems for Farms>
+<Connectivity Solutions, connectedTo, Resource Optimization>
+<Crop Insurance Assessment, connectedTo, Farm Management Software>
+<Crop Insurance Assessment, partOf, Crop Insurance Assessment>
+<Decision Support Systems for Farmers, connectedTo, Digital Agronomy>
+<Digital Agronomy, connectedTo, Satellite Imaging>
+<Digital Agronomy, reports, Supply Chain Traceability>
+<Digital Soil Mapping, connectedTo, Farm Data Integration>
+<Digital Soil Mapping, partOf, Digital Soil Mapping>
+<Drone Monitoring, analyzes_data, Supply Chain Traceability>
+<Drone Monitoring, connectedTo, Decision Support Systems for Farmers>
+<Drone Monitoring, connectedTo, Digital Agronomy>
+<Drone Monitoring, connectedTo, Resource Optimization>
+<Farm Data Integration, connectedTo, Predictive Analytics for Harvest>
+<Farm Data Integration, partOf, Farm Data Integration>
+<Farm Management Software, connectedTo, Blockchain for Agri_Supply Chain>
+<Farm Management Software, partOf, Farm Management Software>
+<Forestry Management with Digital Tools, connectedTo, Supply Chain Traceability>
+<Forestry Management with Digital Tools, harvests, IoT in Agriculture>
+<Geographic Information Systems for Farms, connectedTo, Crop Insurance Assessment>
+<Geographic Information Systems for Farms, partOf, Geographic Information Systems for Farms>
+<IoT in Agriculture, connectedTo, Aquaculture Monitoring>
+<IoT in Agriculture, connectedTo, Supply Chain Traceability>
+<Market Price Forecasting, connectedTo, Digital Soil Mapping>
+<Market Price Forecasting, partOf, Market Price Forecasting>
+<Predictive Analytics for Harvest, connectedTo, Weather Station Data Integration>
+<Predictive Analytics for Harvest, partOf, Predictive Analytics for Harvest>
+<Satellite Imaging, connectedTo, Connectivity Solutions>
+<Satellite Imaging, connectedTo, Resource Optimization>
+<Satellite Imaging, connectedTo, Supply Chain Traceability>
+<Satellite Imaging, resource_efficiency_improves, Connectivity Solutions>
+<Supply Chain Traceability, connectedTo, Connectivity Solutions>
+<Supply Chain Traceability, connectedTo, Market Price Forecasting>
+<Weather Station Data Integration, connectedTo, Drone Monitoring>
+<Weather Station Data Integration, connectedTo, Supply Chain Traceability>
diff --git a/test/graphviz/graph_hard/graphviz_346.dot b/test/graphviz/graph_hard/graphviz_346.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5a8ba53e86978222712f23fd37e9bce4b74409f2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_346.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=BT
+	N0 [label="Nutrition for Esports Athletes" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	N1 [label="Player Contracts" color="#A188D0" fillcolor="#DACBE3" shape=plaintext style=filled]
+	N2 [label="Anti_Cheat Measures" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N3 [label="Merchandise Sales" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+	N4 [label="Broadcast Technology for Esports" color="#00BCD4" fillcolor="#B2EBF2" shape=octagon style=filled]
+	N5 [label="Esports Analytics" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+	N6 [label="Live Streaming Production" color="#A188D0" fillcolor="#DACBE3" shape=octagon style=filled]
+	N7 [label="Fan Community Building" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N8 [label="Game Publisher Relations" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N9 [label="Audience Engagement" color="#A188D0" fillcolor="#DACBE3" shape=plaintext style=filled]
+	N10 [label="Talent Representation" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+	N11 [label="Esports Team Ownership" color="#AED581" fillcolor="#F0F4C3" shape=parallelogram style=filled]
+	N12 [label="Legal Advisory for Esports" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N13 [label="Social Media Management" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N14 [label="Rules and Regulations Enforcement" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+	N15 [label="Esports Education Programs" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	S0 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Coaching Staff Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Data Security for Competitions" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+		nest0_1 [label="Physical Conditioning for Players" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+		nest0_0 -> nest0_1 [label=game_analyzes color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Brand Partnerships" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Prize Pool Management" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+		nest1_1 [label="Team Management" color="#00BCD4" fillcolor="#B2EBF2" shape=diamond style=filled]
+		nest1_2 [label="Performance Analysis" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest1_3 [label="Game Server Management" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=content_produces color="#A188D0" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [label=creates_experiences color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=rules_enforces color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest0_0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N11 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest1_0 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N1 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [label=broadcasts color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_346.txt b/test/graphviz/graph_hard/graphviz_346.txt
new file mode 100644
index 0000000000000000000000000000000000000000..54d0d25d7fdb0d044e0e1330973748fce95fbcfe
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_346.txt
@@ -0,0 +1,40 @@
+<Anti_Cheat Measures, connectedTo, Audience Engagement>
+<Anti_Cheat Measures, connectedTo, Fan Community Building>
+<Anti_Cheat Measures, connectedTo, Merchandise Sales>
+<Anti_Cheat Measures, connectedTo, Rules and Regulations Enforcement>
+<Anti_Cheat Measures, connectedTo, Social Media Management>
+<Audience Engagement, connectedTo, Prize Pool Management>
+<Audience Engagement, rules_enforces, Talent Representation>
+<Broadcast Technology for Esports, connectedTo, Esports Analytics>
+<Data Security for Competitions, game_analyzes, Physical Conditioning for Players>
+<Data Security for Competitions, partOf, Data Security for Competitions>
+<Esports Analytics, broadcasts, Fan Community Building>
+<Esports Analytics, connectedTo, Live Streaming Production>
+<Esports Team Ownership, connectedTo, Data Security for Competitions>
+<Esports Team Ownership, connectedTo, Legal Advisory for Esports>
+<Fan Community Building, connectedTo, Game Publisher Relations>
+<Game Publisher Relations, connectedTo, Audience Engagement>
+<Game Server Management, connectedTo, Player Contracts>
+<Game Server Management, partOf, Game Server Management>
+<Legal Advisory for Esports, connectedTo, Social Media Management>
+<Live Streaming Production, connectedTo, Fan Community Building>
+<Merchandise Sales, connectedTo, Broadcast Technology for Esports>
+<Merchandise Sales, connectedTo, Esports Analytics>
+<Nutrition for Esports Athletes, connectedTo, Fan Community Building>
+<Nutrition for Esports Athletes, connectedTo, Player Contracts>
+<Performance Analysis, creates_experiences, Game Server Management>
+<Performance Analysis, partOf, Performance Analysis>
+<Physical Conditioning for Players, connectedTo, Esports Team Ownership>
+<Physical Conditioning for Players, partOf, Physical Conditioning for Players>
+<Player Contracts, connectedTo, Anti_Cheat Measures>
+<Player Contracts, connectedTo, Esports Analytics>
+<Prize Pool Management, connectedTo, Team Management>
+<Prize Pool Management, partOf, Prize Pool Management>
+<Rules and Regulations Enforcement, connectedTo, Esports Education Programs>
+<Social Media Management, connectedTo, Rules and Regulations Enforcement>
+<Talent Representation, connectedTo, Esports Education Programs>
+<Talent Representation, connectedTo, Esports Team Ownership>
+<Talent Representation, connectedTo, Legal Advisory for Esports>
+<Talent Representation, connectedTo, Rules and Regulations Enforcement>
+<Team Management, content_produces, Performance Analysis>
+<Team Management, partOf, Team Management>
diff --git a/test/graphviz/graph_hard/graphviz_347.dot b/test/graphviz/graph_hard/graphviz_347.dot
new file mode 100644
index 0000000000000000000000000000000000000000..806e3cf70f9a489bb00b66a0ddce148ccbfa7dd0
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_347.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=LR
+	N0 [label="Gaming Hardware Optimization" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Legal Advisory for Esports" color="#C0CA33" fillcolor="#F9FBE7" shape=folder style=filled]
+	N2 [label="Brand Partnerships" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N3 [label="Rules and Regulations Enforcement" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N4 [label="Training Regimen" color="#2196F3" fillcolor="#BBDEFB" shape=plaintext style=filled]
+	N5 [label="Team Management" color="#C0CA33" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N6 [label="Game Strategy Development" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N7 [label="Social Media Management" color="#2196F3" fillcolor="#BBDEFB" shape=folder style=filled]
+	N8 [label="Gambling and Betting Regulation" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N9 [label="Fan Community Building" color="#2196F3" fillcolor="#BBDEFB" shape=folder style=filled]
+	N10 [label="Merchandise Sales" color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+	N11 [label="Physical Conditioning for Players" color="#C0CA33" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+	N12 [label="Event Broadcasting" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N13 [label="Esports Education Programs" color="#C0CA33" fillcolor="#F9FBE7" shape=oval style=filled]
+	N14 [label="Data Security for Competitions" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+	N15 [label="Esports Team Ownership" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N16 [label="Game Publisher Relations" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N17 [label="Network Infrastructure for Tournaments" color="#C0CA33" fillcolor="#F9FBE7" shape=plaintext style=filled]
+	N18 [label="Performance Analysis" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	S0 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Venue Setup" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Audience Engagement" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+		nest0_1 [label="Prize Pool Management" color="#2196F3" fillcolor="#BBDEFB" shape=Mdiamond style=filled]
+		nest0_2 [label="Sponsorship Acquisition" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Player Contracts" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Nutrition for Esports Athletes" color="#9FA9E1" fillcolor="#D6D9F0" shape=oval style=filled]
+		nest1_1 [label="Player Scouting" color="#2196F3" fillcolor="#BBDEFB" shape=plaintext style=filled]
+		nest1_2 [label="Live Streaming Production" color="#C0CA33" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=content_produces color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N5 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> S1 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N7 -> S2 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S2 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	M0 -> N12 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N11 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_347.txt b/test/graphviz/graph_hard/graphviz_347.txt
new file mode 100644
index 0000000000000000000000000000000000000000..41c0a7bef753c6191b9bc484f0292fa07ff07b9a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_347.txt
@@ -0,0 +1,47 @@
+<Audience Engagement, connectedTo, Prize Pool Management>
+<Audience Engagement, partOf, Audience Engagement>
+<Brand Partnerships, connectedTo, Event Broadcasting>
+<Brand Partnerships, content_produces, Rules and Regulations Enforcement>
+<Data Security for Competitions, connectedTo, Esports Team Ownership>
+<Data Security for Competitions, connectedTo, Game Publisher Relations>
+<Data Security for Competitions, connectedTo, Network Infrastructure for Tournaments>
+<Data Security for Competitions, connectedTo, Performance Analysis>
+<Esports Education Programs, connectedTo, Data Security for Competitions>
+<Esports Team Ownership, connectedTo, Game Publisher Relations>
+<Event Broadcasting, connectedTo, Esports Education Programs>
+<Fan Community Building, connectedTo, Merchandise Sales>
+<Fan Community Building, connectedTo, Physical Conditioning for Players>
+<Gambling and Betting Regulation, connectedTo, Fan Community Building>
+<Gambling and Betting Regulation, connectedTo, Physical Conditioning for Players>
+<Game Publisher Relations, connectedTo, Network Infrastructure for Tournaments>
+<Game Strategy Development, connectedTo, Event Broadcasting>
+<Game Strategy Development, connectedTo, Social Media Management>
+<Gaming Hardware Optimization, connectedTo, Brand Partnerships>
+<Gaming Hardware Optimization, connectedTo, Legal Advisory for Esports>
+<Gaming Hardware Optimization, connectedTo, Merchandise Sales>
+<Gaming Hardware Optimization, connectedTo, Training Regimen>
+<Legal Advisory for Esports, connectedTo, Brand Partnerships>
+<Legal Advisory for Esports, connectedTo, Physical Conditioning for Players>
+<Live Streaming Production, connectedTo, Esports Team Ownership>
+<Live Streaming Production, partOf, Live Streaming Production>
+<Merchandise Sales, connectedTo, Physical Conditioning for Players>
+<Network Infrastructure for Tournaments, connectedTo, Performance Analysis>
+<Nutrition for Esports Athletes, connectedTo, Player Scouting>
+<Nutrition for Esports Athletes, partOf, Nutrition for Esports Athletes>
+<Physical Conditioning for Players, connectedTo, Event Broadcasting>
+<Player Scouting, connectedTo, Live Streaming Production>
+<Player Scouting, partOf, Player Scouting>
+<Prize Pool Management, connectedTo, Sponsorship Acquisition>
+<Prize Pool Management, partOf, Prize Pool Management>
+<Rules and Regulations Enforcement, connectedTo, Training Regimen>
+<Social Media Management, connectedTo, Esports Education Programs>
+<Social Media Management, connectedTo, Fan Community Building>
+<Social Media Management, connectedTo, Gambling and Betting Regulation>
+<Social Media Management, connectedTo, Merchandise Sales>
+<Social Media Management, connectedTo, Network Infrastructure for Tournaments>
+<Social Media Management, connectedTo, Nutrition for Esports Athletes>
+<Sponsorship Acquisition, connectedTo, Team Management>
+<Sponsorship Acquisition, partOf, Sponsorship Acquisition>
+<Team Management, connectedTo, Audience Engagement>
+<Team Management, connectedTo, Game Strategy Development>
+<Training Regimen, connectedTo, Team Management>
diff --git a/test/graphviz/graph_hard/graphviz_348.dot b/test/graphviz/graph_hard/graphviz_348.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a824eab308e16f922998be089cb8e865cf6f2872
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_348.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=LR
+	N0 [label="Anti_Cheat Measures" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N1 [label="Player Scouting" color="#FFC2C2" fillcolor="#FFEBEB" shape=parallelogram style=filled]
+	N2 [label="Game Server Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=diamond style=filled]
+	N3 [label="Gambling and Betting Regulation" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N4 [label="Training Regimen" color="#C2B2F0" fillcolor="#EFE6FF" shape=hexagon style=filled]
+	N5 [label="League Management" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+	N6 [label="Team Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=folder style=filled]
+	N7 [label="Legal Advisory for Esports" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+	N8 [label="Live Streaming Production" color="#FFCC80" fillcolor="#FFF0CC" shape=octagon style=filled]
+	N9 [label="Game Strategy Development" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N10 [label="Player Contracts" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Tournament Organization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Mental Health Support for Players" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest0_1 [label="Rules and Regulations Enforcement" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Audience Engagement" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Social Media Management" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+		nest1_1 [label="Talent Representation" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+		nest1_2 [label="Coaching Staff Management" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=creates_experiences color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N9 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N3 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	M2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_35.txt b/test/graphviz/graph_hard/graphviz_35.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4ce3d43de91242049cda4193eb6e51763a11fcb6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_35.txt
@@ -0,0 +1,49 @@
+<Activity Booking, connectedTo, Duty_Free Shopping>
+<Activity Booking, partOf, Activity Booking>
+<Booking Modification, connectedTo, Cruise Ship Boarding>
+<Booking Modification, connectedTo, Return Trip>
+<Booking Modification, connectedTo, Sightseeing Scheduling>
+<Cruise Ship Boarding, connectedTo, Historical Site Exploration>
+<Cruise Ship Boarding, connectedTo, Return Trip>
+<Currency Exchange, connectedTo, Spa Appointment>
+<Currency Exchange, partOf, Currency Exchange>
+<Custom Tour Package Creation, connectedTo, Local Transport>
+<Custom Tour Package Creation, partOf, Custom Tour Package Creation>
+<Duty_Free Shopping, connectedTo, Booking Modification>
+<Duty_Free Shopping, connectedTo, Language Translation Service>
+<Duty_Free Shopping, connectedTo, Local Transport>
+<Duty_Free Shopping, connectedTo, Return Trip>
+<Event Reservation, connectedTo, Photo Capture>
+<Event Reservation, connectedTo, Return Trip>
+<Feedback Collection, connectedTo, Booking Modification>
+<Flight Booking, connectedTo, Historical Site Exploration>
+<Flight Booking, connectedTo, Return Trip>
+<Flight Booking, connectedTo, Souvenir Shopping>
+<Group Tour Coordination, connectedTo, Event Reservation>
+<Historical Site Exploration, connectedTo, Return Trip>
+<Hotel Check_in, connectedTo, Souvenir Shopping>
+<Hotel Check_in, connectedTo, Tourist Information Desk>
+<Itinerary Planning, connectedTo, Flight Booking>
+<Itinerary Planning, connectedTo, Historical Site Exploration>
+<Itinerary Planning, connectedTo, Souvenir Shopping>
+<Language Translation Service, connectedTo, Local Transport>
+<Local Transport, connectedTo, Feedback Collection>
+<Passport Renewal Assistance, connectedTo, Group Tour Coordination>
+<Photo Capture, connectedTo, Duty_Free Shopping>
+<Photo Capture, connectedTo, Historical Site Exploration>
+<Restaurant Reservation, connectedTo, Currency Exchange>
+<Restaurant Reservation, partOf, Restaurant Reservation>
+<Sightseeing Scheduling, connectedTo, Activity Booking>
+<Sightseeing Scheduling, partOf, Sightseeing Scheduling>
+<Souvenir Shopping, connectedTo, Booking Modification>
+<Souvenir Shopping, connectedTo, Cruise Ship Boarding>
+<Souvenir Shopping, connectedTo, Group Tour Coordination>
+<Souvenir Shopping, connectedTo, Passport Renewal Assistance>
+<Souvenir Shopping, connectedTo, Restaurant Reservation>
+<Souvenir Shopping, develops, Historical Site Exploration>
+<Spa Appointment, connectedTo, Custom Tour Package Creation>
+<Spa Appointment, partOf, Spa Appointment>
+<Tourist Information Desk, connectedTo, Event Reservation>
+<Tourist Information Desk, connectedTo, Itinerary Planning>
+<Tourist Information Desk, connectedTo, Local Transport>
+<Tourist Information Desk, connectedTo, Souvenir Shopping>
diff --git a/test/graphviz/graph_hard/graphviz_350.dot b/test/graphviz/graph_hard/graphviz_350.dot
new file mode 100644
index 0000000000000000000000000000000000000000..18895b4d86546805504f56e51bc47d4cfdb9329e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_350.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=RL
+	N0 [label="Deep Brain Stimulation" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N1 [label="Sleep Research" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N2 [label=Connectomics color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N3 [label="Spike Train Analysis" color="#F06292" fillcolor="#FCE4EC" shape=octagon style=filled]
+	N4 [label="Synaptic Plasticity Study" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N5 [label="Gene Therapy for Neurological Disorders" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N6 [label="Memory Formation Research" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N7 [label="Learning Mechanisms Study" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N8 [label="Neurofeedback Therapy" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N9 [label=Electrophysiology color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N10 [label="Drug Development for Brain Disorders" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N11 [label=Optogenetics color="#F06292" fillcolor="#FCE4EC" shape=folder style=filled]
+	N12 [label="Genetic Basis of Brain Disorders" color="#F06292" fillcolor="#FCE4EC" shape=folder style=filled]
+	N13 [label="Neural Network Analysis" color="#4DB6AC" fillcolor="#E0F2F1" shape=folder style=filled]
+	N14 [label="Neurotransmitter Research" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N15 [label="Cellular Neuroscience" color="#4DB6AC" fillcolor="#E0F2F1" shape=octagon style=filled]
+	N16 [label="Cognitive Neuroscience" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N17 [label="Motor Control Research" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	S0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F06292" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#F06292" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Computational Neuroscience" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Addiction Neuroscience" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+		nest0_1 [label="Neurodegenerative Disease Research" color="#F06292" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Molecular Neuroscience" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Neuroprosthetics color="#4DB6AC" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+		nest1_1 [label="Sensory Perception Research" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+		nest1_2 [label="Neural Data Analysis" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=ethical_considers color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=algorithms_develops color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=rehabilitates color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest0_0 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N16 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [label=cognition_studies color="#795548" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N11 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	M1 -> N15 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_352.dot b/test/graphviz/graph_hard/graphviz_352.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ecc2c6978195395b07dfaf39866cc3c7b5fa5fd0
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_352.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=TD
+	N0 [label="Heritage Site Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N1 [label="Digital Documentation" color="#82DAFF" fillcolor="#C8EDFF" shape=oval style=filled]
+	N2 [label="Photogrammetry for Documentation" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N3 [label="Remote Sensing for Heritage" color="#82DAFF" fillcolor="#C8EDFF" shape=Mdiamond style=filled]
+	N4 [label="GIS Mapping for Heritage Sites" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N5 [label="3D Scanning of Artifacts" color="#7986CB" fillcolor="#E8EAF6" shape=octagon style=filled]
+	N6 [label="Intangible Cultural Heritage Preservation" color="#BDAFA8" fillcolor="#E4E0DF" shape=oval style=filled]
+	N7 [label="Sustainable Heritage Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=folder style=filled]
+	N8 [label="Crowdsourcing for Heritage Data" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N9 [label="Augmented Reality Tours" color="#7986CB" fillcolor="#E8EAF6" shape=folder style=filled]
+	N10 [label="Community Engagement" color="#82DAFF" fillcolor="#C8EDFF" shape=oval style=filled]
+	N11 [label="Looting Prevention" color="#7986CB" fillcolor="#E8EAF6" shape=diamond style=filled]
+	N12 [label="Risk Assessment for Heritage" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N13 [label="Oral History Collection" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N14 [label="Heritage Impact Assessment" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N15 [label="Illicit Trafficking Control" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	S0 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Artifact Conservation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Disaster Preparedness for Heritage" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+		nest0_1 [label="Conservation Science" color="#82DAFF" fillcolor="#C8EDFF" shape=parallelogram style=filled]
+		nest0_2 [label="Archival Management" color="#7986CB" fillcolor="#E8EAF6" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Archaeological Excavation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Traditional Knowledge Documentation" color="#82DAFF" fillcolor="#C8EDFF" shape=plaintext style=filled]
+		nest1_1 [label="Underwater Cultural Heritage" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+		nest1_2 [label="Historical Research" color="#BDAFA8" fillcolor="#E4E0DF" shape=parallelogram style=filled]
+		nest1_3 [label="World Heritage Site Management" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=documents color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N15 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S1 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> S2 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	S2 -> N15 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_352.txt b/test/graphviz/graph_hard/graphviz_352.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1998599bc1159ef832da9c65cd07b878fe57ffbc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_352.txt
@@ -0,0 +1,43 @@
+<3D Scanning of Artifacts, connectedTo, Augmented Reality Tours>
+<3D Scanning of Artifacts, connectedTo, Intangible Cultural Heritage Preservation>
+<Archival Management, connectedTo, Illicit Trafficking Control>
+<Archival Management, partOf, Archival Management>
+<Augmented Reality Tours, connectedTo, Community Engagement>
+<Community Engagement, connectedTo, Heritage Impact Assessment>
+<Community Engagement, connectedTo, Illicit Trafficking Control>
+<Community Engagement, connectedTo, Looting Prevention>
+<Community Engagement, connectedTo, Oral History Collection>
+<Community Engagement, connectedTo, Risk Assessment for Heritage>
+<Conservation Science, connectedTo, Archival Management>
+<Conservation Science, partOf, Conservation Science>
+<Crowdsourcing for Heritage Data, connectedTo, Augmented Reality Tours>
+<Digital Documentation, connectedTo, Augmented Reality Tours>
+<Digital Documentation, connectedTo, Photogrammetry for Documentation>
+<Disaster Preparedness for Heritage, connectedTo, Conservation Science>
+<Disaster Preparedness for Heritage, partOf, Disaster Preparedness for Heritage>
+<GIS Mapping for Heritage Sites, connectedTo, 3D Scanning of Artifacts>
+<GIS Mapping for Heritage Sites, connectedTo, Disaster Preparedness for Heritage>
+<GIS Mapping for Heritage Sites, connectedTo, Heritage Impact Assessment>
+<GIS Mapping for Heritage Sites, connectedTo, Illicit Trafficking Control>
+<GIS Mapping for Heritage Sites, connectedTo, Looting Prevention>
+<GIS Mapping for Heritage Sites, connectedTo, Traditional Knowledge Documentation>
+<Heritage Impact Assessment, connectedTo, Illicit Trafficking Control>
+<Heritage Site Management, connectedTo, Digital Documentation>
+<Historical Research, connectedTo, World Heritage Site Management>
+<Historical Research, partOf, Historical Research>
+<Intangible Cultural Heritage Preservation, connectedTo, Sustainable Heritage Management>
+<Looting Prevention, connectedTo, Risk Assessment for Heritage>
+<Oral History Collection, connectedTo, Heritage Impact Assessment>
+<Photogrammetry for Documentation, connectedTo, Augmented Reality Tours>
+<Photogrammetry for Documentation, connectedTo, Remote Sensing for Heritage>
+<Remote Sensing for Heritage, connectedTo, GIS Mapping for Heritage Sites>
+<Risk Assessment for Heritage, connectedTo, Heritage Impact Assessment>
+<Risk Assessment for Heritage, connectedTo, Illicit Trafficking Control>
+<Risk Assessment for Heritage, connectedTo, Oral History Collection>
+<Sustainable Heritage Management, connectedTo, Crowdsourcing for Heritage Data>
+<Traditional Knowledge Documentation, connectedTo, Underwater Cultural Heritage>
+<Traditional Knowledge Documentation, partOf, Traditional Knowledge Documentation>
+<Underwater Cultural Heritage, documents, Historical Research>
+<Underwater Cultural Heritage, partOf, Underwater Cultural Heritage>
+<World Heritage Site Management, connectedTo, Photogrammetry for Documentation>
+<World Heritage Site Management, partOf, World Heritage Site Management>
diff --git a/test/graphviz/graph_hard/graphviz_353.dot b/test/graphviz/graph_hard/graphviz_353.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3090acaca381eadede5dbb8f3dac54db970d945f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_353.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=LR
+	N0 [label="Traditional Knowledge Documentation" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N1 [label="Legal Protection for Heritage" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N2 [label="Augmented Reality Tours" color="#F06292" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N3 [label="Oral History Collection" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N4 [label="Site Preservation" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N5 [label="Community Engagement" color="#6EB76D" fillcolor="#E9F7E8" shape=plaintext style=filled]
+	N6 [label="Looting Prevention" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N7 [label="Exhibition Curation" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N8 [label="Cultural Tourism Development" color="#FF5722" fillcolor="#FFCCBC" shape=plaintext style=filled]
+	N9 [label="Material Analysis" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N10 [label="Sustainable Heritage Management" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N11 [label="Digital Documentation" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N12 [label="Photogrammetry for Documentation" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N13 [label="Remote Sensing for Heritage" color="#FF5722" fillcolor="#FFCCBC" shape=Mdiamond style=filled]
+	N14 [label="Adaptive Reuse of Heritage Buildings" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Virtual Reality Recreations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
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+		nest0_1 [label="Artifact Conservation" color="#F06292" fillcolor="#FCE4EC" shape=hexagon style=filled]
+		nest0_2 [label="Intangible Cultural Heritage Preservation" color="#F06292" fillcolor="#FCE4EC" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
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+		nest1_0 [label="Crowdsourcing for Heritage Data" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+		nest1_1 [label="Climate Change Impact on Heritage" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [label=archives color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	}
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+	N11 -> nest0_0 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N2 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S0 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [label=data_collects color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S2 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [label=documents color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=narrates color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N11 -> M1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N12 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M2 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	M2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_354.dot b/test/graphviz/graph_hard/graphviz_354.dot
new file mode 100644
index 0000000000000000000000000000000000000000..189736600a97c06422a01850ad222e2314167afb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_354.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=RL
+	N0 [label="Indigenous Cultural Heritage Rights" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N1 [label="Underwater Cultural Heritage" color="#E0E0E0" fillcolor="#EBEBEB" shape=folder style=filled]
+	N2 [label="Adaptive Reuse of Heritage Buildings" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N3 [label="GIS Mapping for Heritage Sites" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N4 [label="Intangible Cultural Heritage Preservation" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+	N5 [label="Repatriation of Artifacts" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N6 [label="Archival Management" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N7 [label="Legal Protection for Heritage" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+	N8 [label="3D Scanning of Artifacts" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	S0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Augmented Reality Tours" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cultural Tourism Development" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+		nest0_1 [label="World Heritage Site Management" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Historical Research" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Virtual Reality Recreations" color="#A1887F" fillcolor="#EFEBE9" shape=diamond style=filled]
+		nest1_1 [label="Community Engagement" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+		nest1_2 [label="Traditional Knowledge Documentation" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+		nest1_3 [label="Archaeological Excavation" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N3 [label="3D_scans" color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [label="AR or VR_uses" color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [label=community_participates color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [label=intangible_heritage_safeguards color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_355.dot b/test/graphviz/graph_hard/graphviz_355.dot
new file mode 100644
index 0000000000000000000000000000000000000000..72533c4fadbcad53a7c8c60a4199491b0daad6cb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_355.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=LR
+	N0 [label="Vaccine Synthesis" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N1 [label="Protein Design" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N2 [label="Bio_logic Gates" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N3 [label="Gene Therapy Delivery Systems" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N4 [label="Artificial Cells" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N5 [label="Microbial Factories" color="#FFEB3B" fillcolor="#FFF9C4" shape=plaintext style=filled]
+	N6 [label="Gene Synthesis Platforms" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N7 [label="Directed Evolution Automation" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N8 [label="Genome Engineering" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N9 [label="High_Throughput Screening" color="#E91E63" fillcolor="#FCE4EC" shape=oval style=filled]
+	N10 [label="Ethical Implications" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N11 [label="Biofuel Production" color="#FFEB3B" fillcolor="#FFF9C4" shape=octagon style=filled]
+	N12 [label="Biosafety Level Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N13 [label="Drug Delivery Systems" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	S0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Cellular Reprogramming" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Novel Enzyme Creation" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+		nest0_1 [label="Diagnostic Tool Development" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest0_2 [label=Bio_manufacturing color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest0_3 [label="Biosecurity Protocols" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest0_0 -> nest0_1 [label=circuits_designs color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [label=modifies color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Directed Evolution" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Bioremediation Applications" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+		nest1_1 [label="Synthetic Organism Design" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest1_2 [label="Risk Assessment" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=pathways_constructs color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=systems_develops color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N3 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S0 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S2 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [label=molecules_produces color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [label=organisms_creates color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_355.txt b/test/graphviz/graph_hard/graphviz_355.txt
new file mode 100644
index 0000000000000000000000000000000000000000..98720170cfe1f108b77bfe07832c71a296525996
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_355.txt
@@ -0,0 +1,43 @@
+<Artificial Cells, connectedTo, Microbial Factories>
+<Bio_logic Gates, connectedTo, Gene Therapy Delivery Systems>
+<Bio_manufacturing, modifies, Biosecurity Protocols>
+<Bio_manufacturing, partOf, Bio_manufacturing>
+<Biofuel Production, connectedTo, Biosafety Level Management>
+<Bioremediation Applications, connectedTo, Synthetic Organism Design>
+<Bioremediation Applications, partOf, Bioremediation Applications>
+<Biosafety Level Management, connectedTo, Drug Delivery Systems>
+<Biosecurity Protocols, connectedTo, Gene Therapy Delivery Systems>
+<Biosecurity Protocols, partOf, Biosecurity Protocols>
+<Diagnostic Tool Development, connectedTo, Bio_manufacturing>
+<Diagnostic Tool Development, partOf, Diagnostic Tool Development>
+<Directed Evolution Automation, connectedTo, Genome Engineering>
+<Directed Evolution Automation, connectedTo, High_Throughput Screening>
+<Ethical Implications, connectedTo, Biofuel Production>
+<Ethical Implications, connectedTo, Biosafety Level Management>
+<Ethical Implications, connectedTo, Drug Delivery Systems>
+<Gene Synthesis Platforms, connectedTo, Bioremediation Applications>
+<Gene Synthesis Platforms, connectedTo, High_Throughput Screening>
+<Gene Synthesis Platforms, connectedTo, Novel Enzyme Creation>
+<Gene Synthesis Platforms, molecules_produces, Genome Engineering>
+<Gene Synthesis Platforms, systems_develops, Directed Evolution Automation>
+<Gene Therapy Delivery Systems, pathways_constructs, Artificial Cells>
+<Genome Engineering, connectedTo, High_Throughput Screening>
+<High_Throughput Screening, connectedTo, Biofuel Production>
+<High_Throughput Screening, connectedTo, Drug Delivery Systems>
+<High_Throughput Screening, connectedTo, Ethical Implications>
+<Microbial Factories, connectedTo, Gene Synthesis Platforms>
+<Microbial Factories, connectedTo, Genome Engineering>
+<Microbial Factories, organisms_creates, High_Throughput Screening>
+<Novel Enzyme Creation, circuits_designs, Diagnostic Tool Development>
+<Novel Enzyme Creation, partOf, Novel Enzyme Creation>
+<Protein Design, connectedTo, Bio_logic Gates>
+<Protein Design, connectedTo, High_Throughput Screening>
+<Risk Assessment, connectedTo, Protein Design>
+<Risk Assessment, partOf, Risk Assessment>
+<Synthetic Organism Design, connectedTo, Risk Assessment>
+<Synthetic Organism Design, partOf, Synthetic Organism Design>
+<Vaccine Synthesis, connectedTo, Artificial Cells>
+<Vaccine Synthesis, connectedTo, Biofuel Production>
+<Vaccine Synthesis, connectedTo, Gene Synthesis Platforms>
+<Vaccine Synthesis, connectedTo, Microbial Factories>
+<Vaccine Synthesis, connectedTo, Protein Design>
diff --git a/test/graphviz/graph_hard/graphviz_356.dot b/test/graphviz/graph_hard/graphviz_356.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0f90b9100f90baa14b849843cb0b0f89ae7f4051
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_356.dot
@@ -0,0 +1,57 @@
+digraph {
+	rankdir=TD
+	N0 [label="Microbial Factories" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N1 [label="DNA Storage Technologies" color="#26A69A" fillcolor="#E0F2F1" shape=diamond style=filled]
+	N2 [label="Cell_Free Systems" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N3 [label="Biosensor Development" color="#26A69A" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N4 [label="DNA Synthesis" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N5 [label="Drug Delivery Systems" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N6 [label="Regulatory Frameworks" color="#26A69A" fillcolor="#E0F2F1" shape=octagon style=filled]
+	N7 [label="CRISPR_Cas System Optimization" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N8 [label="Sustainable Chemical Production" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N9 [label="Bioremediation Applications" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S0 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Synthetic Gene Networks" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Bio_manufacturing color="#607D8B" fillcolor="#CFD8DC" shape=oval style=filled]
+		nest0_1 [label="Synthetic Organism Design" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+		nest0_2 [label="Biofoundry Operations" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Directed Evolution" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Vaccine Synthesis" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_1 [label="Novel Enzyme Creation" color="#607D8B" fillcolor="#CFD8DC" shape=diamond style=filled]
+		nest1_2 [label="Ethical Implications" color="#607D8B" fillcolor="#CFD8DC" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [label=safety_ensures color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=functions_implements color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N2 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N2 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [label=collaborates color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_357.dot b/test/graphviz/graph_hard/graphviz_357.dot
new file mode 100644
index 0000000000000000000000000000000000000000..03bede9afa61950ae021081179e4adb4a54d3228
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_357.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=RL
+	N0 [label="Directed Evolution" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="DNA Synthesis" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+	N2 [label="Biofuel Production" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N3 [label="High_Throughput Screening" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N4 [label="Drug Delivery Systems" color="#BDAFA8" fillcolor="#E4E0DF" shape=Mdiamond style=filled]
+	N5 [label="Biosafety Level Management" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N6 [label="Cell_Free Systems" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N7 [label="Regulatory Frameworks" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N8 [label="Computational Design of Biological Systems" color="#7986CB" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	N9 [label="CRISPR_Cas System Optimization" color="#CB9BE1" fillcolor="#F2E6F5" shape=octagon style=filled]
+	N10 [label="Novel Enzyme Creation" color="#BDAFA8" fillcolor="#E4E0DF" shape=Mdiamond style=filled]
+	N11 [label="Artificial Cells" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N12 [label="Biosensor Development" color="#BDAFA8" fillcolor="#E4E0DF" shape=octagon style=filled]
+	N13 [label="Ethical Implications" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	S0 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Genome Engineering" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Synthetic Organism Design" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+		nest0_1 [label="Metabolic Pathway Engineering" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+		nest0_2 [label="Cellular Reprogramming" color="#7986CB" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+		nest0_3 [label="Gene Therapy Delivery Systems" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Gene Synthesis Platforms" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Directed Evolution Automation" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+		nest1_1 [label="Bio_logic Gates" color="#CB9BE1" fillcolor="#F2E6F5" shape=oval style=filled]
+		nest1_2 [label="Sustainable Chemical Production" color="#BDAFA8" fillcolor="#E4E0DF" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=DNA_sequences color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N1 [label=researches color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [label=collaborates color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N6 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N8 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N10 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N3 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_357.txt b/test/graphviz/graph_hard/graphviz_357.txt
new file mode 100644
index 0000000000000000000000000000000000000000..37baee89bbca6ae25cbd0d877dfb2788e3ece7e2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_357.txt
@@ -0,0 +1,40 @@
+<Artificial Cells, connectedTo, Biosensor Development>
+<Bio_logic Gates, connectedTo, Sustainable Chemical Production>
+<Bio_logic Gates, partOf, Bio_logic Gates>
+<Biofuel Production, connectedTo, High_Throughput Screening>
+<Biosafety Level Management, connectedTo, Cell_Free Systems>
+<Biosafety Level Management, connectedTo, Ethical Implications>
+<Biosafety Level Management, connectedTo, Novel Enzyme Creation>
+<Biosensor Development, connectedTo, Ethical Implications>
+<CRISPR_Cas System Optimization, collaborates, Directed Evolution Automation>
+<CRISPR_Cas System Optimization, connectedTo, Novel Enzyme Creation>
+<Cell_Free Systems, connectedTo, Regulatory Frameworks>
+<Cellular Reprogramming, connectedTo, Gene Therapy Delivery Systems>
+<Cellular Reprogramming, partOf, Cellular Reprogramming>
+<Computational Design of Biological Systems, connectedTo, Biosensor Development>
+<Computational Design of Biological Systems, connectedTo, CRISPR_Cas System Optimization>
+<Computational Design of Biological Systems, connectedTo, Ethical Implications>
+<Computational Design of Biological Systems, connectedTo, Novel Enzyme Creation>
+<DNA Synthesis, connectedTo, Biofuel Production>
+<DNA Synthesis, connectedTo, Ethical Implications>
+<DNA Synthesis, connectedTo, High_Throughput Screening>
+<DNA Synthesis, connectedTo, Novel Enzyme Creation>
+<Directed Evolution, connectedTo, DNA Synthesis>
+<Directed Evolution, connectedTo, High_Throughput Screening>
+<Directed Evolution Automation, connectedTo, Bio_logic Gates>
+<Directed Evolution Automation, partOf, Directed Evolution Automation>
+<Drug Delivery Systems, connectedTo, Biosafety Level Management>
+<Gene Therapy Delivery Systems, partOf, Gene Therapy Delivery Systems>
+<Gene Therapy Delivery Systems, researches, DNA Synthesis>
+<High_Throughput Screening, DNA_sequences, Drug Delivery Systems>
+<High_Throughput Screening, connectedTo, Ethical Implications>
+<High_Throughput Screening, connectedTo, Novel Enzyme Creation>
+<High_Throughput Screening, connectedTo, Synthetic Organism Design>
+<Metabolic Pathway Engineering, connectedTo, Cellular Reprogramming>
+<Metabolic Pathway Engineering, partOf, Metabolic Pathway Engineering>
+<Novel Enzyme Creation, connectedTo, Artificial Cells>
+<Regulatory Frameworks, connectedTo, Computational Design of Biological Systems>
+<Sustainable Chemical Production, connectedTo, Cell_Free Systems>
+<Sustainable Chemical Production, partOf, Sustainable Chemical Production>
+<Synthetic Organism Design, connectedTo, Metabolic Pathway Engineering>
+<Synthetic Organism Design, partOf, Synthetic Organism Design>
diff --git a/test/graphviz/graph_hard/graphviz_359.dot b/test/graphviz/graph_hard/graphviz_359.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cefb9fbe469feae9353eaa067ace2376aa6d9f26
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_359.dot
@@ -0,0 +1,85 @@
+digraph {
+	rankdir=RL
+	N0 [label="Educational Data Mining" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N1 [label="Collaborative Learning Platforms" color="#4CAF50" fillcolor="#C8E6C9" shape=Mdiamond style=filled]
+	N2 [label="Educational Robotics" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N3 [label="Teacher Training Platforms" color="#4CAF50" fillcolor="#C8E6C9" shape=diamond style=filled]
+	N4 [label="Virtual Classrooms" color="#61CAC3" fillcolor="#C2E8E6" shape=oval style=filled]
+	N5 [label="Gamified Learning" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N6 [label="Personalized Learning Paths" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N7 [label="Simulations for Learning" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N8 [label="Learning Design Principles" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N9 [label="Student Performance Tracking" color="#61CAC3" fillcolor="#C2E8E6" shape=oval style=filled]
+	N10 [label="Formative Assessment Tools" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N11 [label="Remote Learning Solutions" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N12 [label="Adaptive Learning Systems" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N13 [label="Learning Analytics Dashboards" color="#4CAF50" fillcolor="#C8E6C9" shape=Mdiamond style=filled]
+	N14 [label="AI in Education" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N15 [label="Augmented Reality in Education" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N16 [label="Social_Emotional Learning Tools" color="#61CAC3" fillcolor="#C2E8E6" shape=plaintext style=filled]
+	N17 [label="Digital Textbooks" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	S0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Student Information Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Online Tutoring Platforms" color="#61CAC3" fillcolor="#C2E8E6" shape=folder style=filled]
+		nest0_1 [label="Educational Apps Development" color="#BDBDBD" fillcolor="#F5F5F5" shape=plaintext style=filled]
+		nest0_2 [label="Blockchain for Educational Credentials" color="#BDBDBD" fillcolor="#F5F5F5" shape=diamond style=filled]
+		nest0_3 [label="E_Learning Platform Design" color="#BDBDBD" fillcolor="#F5F5F5" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Badging and Certification Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Data Privacy in Education" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+		nest1_1 [label="EdTech Hardware Solutions" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+		nest1_2 [label="Learning Management System Development" color="#4CAF50" fillcolor="#C8E6C9" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=tools_provides color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=markets color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=reports color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=secures_data color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [label=learning_gamifies color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N16 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N13 -> nest1_0 [label=privacy_protects color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N8 -> S1 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S2 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N15 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	S2 -> N16 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N17 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N10 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_359.txt b/test/graphviz/graph_hard/graphviz_359.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c17d8f8b5fb6b1455f00ad7b7989748c72de6c67
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_359.txt
@@ -0,0 +1,46 @@
+<AI in Education, learning_gamifies, Augmented Reality in Education>
+<Adaptive Learning Systems, secures_data, Learning Analytics Dashboards>
+<Augmented Reality in Education, connectedTo, Social_Emotional Learning Tools>
+<Blockchain for Educational Credentials, connectedTo, E_Learning Platform Design>
+<Blockchain for Educational Credentials, partOf, Blockchain for Educational Credentials>
+<Collaborative Learning Platforms, connectedTo, Adaptive Learning Systems>
+<Collaborative Learning Platforms, connectedTo, Digital Textbooks>
+<Collaborative Learning Platforms, connectedTo, Educational Robotics>
+<Collaborative Learning Platforms, connectedTo, Formative Assessment Tools>
+<Data Privacy in Education, connectedTo, EdTech Hardware Solutions>
+<Data Privacy in Education, partOf, Data Privacy in Education>
+<E_Learning Platform Design, connectedTo, Social_Emotional Learning Tools>
+<E_Learning Platform Design, partOf, E_Learning Platform Design>
+<EdTech Hardware Solutions, connectedTo, Learning Management System Development>
+<EdTech Hardware Solutions, partOf, EdTech Hardware Solutions>
+<Educational Apps Development, connectedTo, Blockchain for Educational Credentials>
+<Educational Apps Development, partOf, Educational Apps Development>
+<Educational Data Mining, connectedTo, Collaborative Learning Platforms>
+<Educational Data Mining, connectedTo, Virtual Classrooms>
+<Educational Robotics, connectedTo, Formative Assessment Tools>
+<Educational Robotics, connectedTo, Virtual Classrooms>
+<Educational Robotics, tools_provides, Teacher Training Platforms>
+<Formative Assessment Tools, reports, Remote Learning Solutions>
+<Gamified Learning, connectedTo, Formative Assessment Tools>
+<Gamified Learning, connectedTo, Personalized Learning Paths>
+<Learning Analytics Dashboards, connectedTo, AI in Education>
+<Learning Analytics Dashboards, privacy_protects, Data Privacy in Education>
+<Learning Design Principles, connectedTo, Digital Textbooks>
+<Learning Design Principles, connectedTo, Remote Learning Solutions>
+<Learning Design Principles, connectedTo, Student Performance Tracking>
+<Learning Management System Development, connectedTo, Collaborative Learning Platforms>
+<Learning Management System Development, partOf, Learning Management System Development>
+<Online Tutoring Platforms, connectedTo, Educational Apps Development>
+<Online Tutoring Platforms, partOf, Online Tutoring Platforms>
+<Personalized Learning Paths, connectedTo, Formative Assessment Tools>
+<Personalized Learning Paths, connectedTo, Simulations for Learning>
+<Remote Learning Solutions, connectedTo, Adaptive Learning Systems>
+<Remote Learning Solutions, connectedTo, Augmented Reality in Education>
+<Remote Learning Solutions, connectedTo, Digital Textbooks>
+<Remote Learning Solutions, connectedTo, Social_Emotional Learning Tools>
+<Simulations for Learning, connectedTo, Learning Design Principles>
+<Simulations for Learning, connectedTo, Online Tutoring Platforms>
+<Social_Emotional Learning Tools, connectedTo, Digital Textbooks>
+<Student Performance Tracking, connectedTo, Formative Assessment Tools>
+<Teacher Training Platforms, markets, Virtual Classrooms>
+<Virtual Classrooms, connectedTo, Gamified Learning>
diff --git a/test/graphviz/graph_hard/graphviz_36.dot b/test/graphviz/graph_hard/graphviz_36.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f529f59ab6b281ba2347ddf88acef06876f6c811
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_36.dot
@@ -0,0 +1,83 @@
+digraph {
+	rankdir=TD
+	N0 [label="Museum Visit" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N1 [label="Trip Sharing" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N2 [label="Concert Ticketing" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N3 [label="Travel Blog Creation" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+	N4 [label="Tourist Information Desk" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N5 [label="Duty_Free Shopping" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N6 [label="Booking Modification" color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+	N7 [label="Visa Application" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N8 [label="Cruise Ship Boarding" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N9 [label="Group Tour Coordination" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N10 [label="Itinerary Planning" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N11 [label="Local Transport" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N12 [label="Baggage Handling" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N13 [label="Loyalty Program Enrollment" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N14 [label="Lost and Found Service" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N15 [label="Hotel Check_in" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N16 [label="Restaurant Reservation" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N17 [label="Currency Exchange" color="#00BCD4" fillcolor="#E0F7FA" shape=folder style=filled]
+	N18 [label="Adventure Sports Booking" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	S0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Rental Car Pickup" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Photo Capture" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest0_1 [label="Spa Appointment" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest0_2 [label="Cultural Immersion Program" color="#82DAFF" fillcolor="#C8EDFF" shape=oval style=filled]
+		nest0_3 [label="Historical Site Exploration" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Sightseeing Scheduling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Emergency Assistance" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest1_1 [label="Flight Booking" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> nest0_0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N11 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N0 -> S1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N3 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N8 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N13 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_36.txt b/test/graphviz/graph_hard/graphviz_36.txt
new file mode 100644
index 0000000000000000000000000000000000000000..24046203d949728cbba8607ec3eb11f4876e91fd
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_36.txt
@@ -0,0 +1,45 @@
+<Baggage Handling, connectedTo, Loyalty Program Enrollment>
+<Booking Modification, connectedTo, Cruise Ship Boarding>
+<Booking Modification, connectedTo, Group Tour Coordination>
+<Booking Modification, connectedTo, Hotel Check_in>
+<Booking Modification, connectedTo, Visa Application>
+<Concert Ticketing, connectedTo, Baggage Handling>
+<Concert Ticketing, connectedTo, Travel Blog Creation>
+<Cruise Ship Boarding, connectedTo, Group Tour Coordination>
+<Cruise Ship Boarding, connectedTo, Loyalty Program Enrollment>
+<Cultural Immersion Program, connectedTo, Historical Site Exploration>
+<Cultural Immersion Program, partOf, Cultural Immersion Program>
+<Currency Exchange, connectedTo, Adventure Sports Booking>
+<Duty_Free Shopping, connectedTo, Booking Modification>
+<Emergency Assistance, connectedTo, Flight Booking>
+<Emergency Assistance, partOf, Emergency Assistance>
+<Flight Booking, connectedTo, Local Transport>
+<Flight Booking, partOf, Flight Booking>
+<Group Tour Coordination, connectedTo, Itinerary Planning>
+<Historical Site Exploration, connectedTo, Concert Ticketing>
+<Historical Site Exploration, partOf, Historical Site Exploration>
+<Hotel Check_in, connectedTo, Photo Capture>
+<Hotel Check_in, connectedTo, Restaurant Reservation>
+<Itinerary Planning, connectedTo, Baggage Handling>
+<Itinerary Planning, connectedTo, Local Transport>
+<Local Transport, connectedTo, Baggage Handling>
+<Lost and Found Service, connectedTo, Hotel Check_in>
+<Loyalty Program Enrollment, connectedTo, Lost and Found Service>
+<Museum Visit, connectedTo, Adventure Sports Booking>
+<Museum Visit, connectedTo, Currency Exchange>
+<Museum Visit, connectedTo, Lost and Found Service>
+<Museum Visit, connectedTo, Travel Blog Creation>
+<Museum Visit, connectedTo, Trip Sharing>
+<Photo Capture, connectedTo, Spa Appointment>
+<Photo Capture, partOf, Photo Capture>
+<Restaurant Reservation, connectedTo, Currency Exchange>
+<Spa Appointment, connectedTo, Cultural Immersion Program>
+<Spa Appointment, partOf, Spa Appointment>
+<Tourist Information Desk, connectedTo, Duty_Free Shopping>
+<Tourist Information Desk, connectedTo, Emergency Assistance>
+<Travel Blog Creation, connectedTo, Baggage Handling>
+<Travel Blog Creation, connectedTo, Tourist Information Desk>
+<Trip Sharing, connectedTo, Baggage Handling>
+<Trip Sharing, connectedTo, Concert Ticketing>
+<Trip Sharing, connectedTo, Loyalty Program Enrollment>
+<Visa Application, connectedTo, Cruise Ship Boarding>
diff --git a/test/graphviz/graph_hard/graphviz_360.txt b/test/graphviz/graph_hard/graphviz_360.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d747bedaeb6d86fc2a2a787a3a5d2fe83574bd41
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_360.txt
@@ -0,0 +1,39 @@
+<Accessibility in EdTech, connectedTo, Augmented Reality in Education>
+<Assessment Tools, connectedTo, Curriculum Digitization>
+<Assessment Tools, partOf, Assessment Tools>
+<Augmented Reality in Education, connectedTo, Virtual Classrooms>
+<Badging and Certification Systems, connectedTo, Accessibility in EdTech>
+<Curriculum Digitization, connectedTo, Digital Textbooks>
+<Curriculum Digitization, partOf, Curriculum Digitization>
+<Data Privacy in Education, connectedTo, Learning Design Principles>
+<Data Privacy in Education, partOf, Data Privacy in Education>
+<Digital Textbooks, connectedTo, Massive Open Online Courses>
+<EdTech Hardware Solutions, connectedTo, Badging and Certification Systems>
+<EdTech Hardware Solutions, connectedTo, Educational Data Mining>
+<EdTech Hardware Solutions, connectedTo, Gamified Learning>
+<Educational Data Mining, connectedTo, Augmented Reality in Education>
+<Educational Data Mining, connectedTo, Badging and Certification Systems>
+<Educational Data Mining, connectedTo, Digital Textbooks>
+<Educational Data Mining, connectedTo, Massive Open Online Courses>
+<Educational Data Mining, connectedTo, Student Performance Tracking>
+<Educational Robotics, connectedTo, Student Performance Tracking>
+<Formative Assessment Tools, connectedTo, Assessment Tools>
+<Formative Assessment Tools, connectedTo, Educational Robotics>
+<Gamified Learning, connectedTo, Badging and Certification Systems>
+<Gamified Learning, connectedTo, Educational Data Mining>
+<Gamified Learning, connectedTo, Remote Learning Solutions>
+<Gamified Learning, connectedTo, Student Performance Tracking>
+<Gamified Learning, connectedTo, Virtual Classrooms>
+<Learning Design Principles, connectedTo, Virtual Reality in Education>
+<Learning Design Principles, partOf, Learning Design Principles>
+<Machine Learning for Learning Analytics, connectedTo, Formative Assessment Tools>
+<Online Tutoring Platforms, connectedTo, Simulations for Learning>
+<Online Tutoring Platforms, parents_engages, Educational Data Mining>
+<Remote Learning Solutions, connectedTo, Educational Data Mining>
+<Remote Learning Solutions, tools_provides, Online Tutoring Platforms>
+<Simulations for Learning, connectedTo, Data Privacy in Education>
+<Simulations for Learning, partOf, Simulations for Learning>
+<Student Performance Tracking, connectedTo, Digital Textbooks>
+<Virtual Classrooms, connectedTo, Machine Learning for Learning Analytics>
+<Virtual Reality in Education, connectedTo, Student Performance Tracking>
+<Virtual Reality in Education, partOf, Virtual Reality in Education>
diff --git a/test/graphviz/graph_hard/graphviz_37.txt b/test/graphviz/graph_hard/graphviz_37.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ce6829ac5b5053c6dd3bea9e30258844dfe204c4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_37.txt
@@ -0,0 +1,47 @@
+<Building Permit Application, connectedTo, Maintenance Request>
+<Building Permit Application, partOf, Building Permit Application>
+<Buyer Inquiry, connectedTo, Escrow Setup>
+<Buyer Inquiry, connectedTo, HOA Management>
+<Buyer Inquiry, connectedTo, Property Listing>
+<Commercial Lease Negotiation, connectedTo, HOA Management>
+<Commercial Lease Negotiation, leases, Contract Review>
+<Commission Distribution, connectedTo, Zoning Compliance>
+<Contract Review, invests, Loan Pre_Approval>
+<Escrow Setup, connectedTo, Property Marketing>
+<Escrow Setup, connectedTo, Property Tax Payment>
+<Eviction Process, advertises, Buyer Inquiry>
+<Home Inspection, connectedTo, Renovation Planning>
+<Home Inspection, partOf, Home Inspection>
+<Loan Pre_Approval, connectedTo, Eviction Process>
+<Maintenance Request, connectedTo, Mortgage Application Assistance>
+<Maintenance Request, partOf, Maintenance Request>
+<Mortgage Application Assistance, connectedTo, Eviction Process>
+<Mortgage Application Assistance, partOf, Mortgage Application Assistance>
+<Open House Event, connectedTo, Contract Review>
+<Open House Event, connectedTo, Escrow Setup>
+<Open House Event, connectedTo, Tenant Screening>
+<Price Negotiation, connectedTo, Property Appraisal>
+<Property Appraisal, complies, Contract Review>
+<Property Appraisal, connectedTo, Buyer Inquiry>
+<Property Appraisal, connectedTo, Commercial Lease Negotiation>
+<Property Appraisal, connectedTo, Property Listing>
+<Property Appraisal, connectedTo, Property Valuation>
+<Property Appraisal, connectedTo, Tenant Screening>
+<Property Appraisal, renovates, HOA Management>
+<Property Listing, connectedTo, HOA Management>
+<Property Marketing, connectedTo, Home Inspection>
+<Property Marketing, partOf, Property Marketing>
+<Property Tax Payment, connectedTo, Property Listing>
+<Property Valuation, connectedTo, Open House Event>
+<Property Valuation, transfers, Tenant Screening>
+<Renovation Planning, connectedTo, Property Tax Payment>
+<Renovation Planning, partOf, Renovation Planning>
+<Rental Agreement, connectedTo, Virtual Tour Creation>
+<Tenant Screening, connectedTo, Building Permit Application>
+<Tenant Screening, connectedTo, Commercial Lease Negotiation>
+<Title Check, connectedTo, HOA Management>
+<Title Check, connectedTo, Rental Agreement>
+<Virtual Tour Creation, connectedTo, Commission Distribution>
+<Zoning Compliance, connectedTo, HOA Management>
+<Zoning Compliance, connectedTo, Price Negotiation>
+<Zoning Compliance, connectedTo, Tenant Screening>
diff --git a/test/graphviz/graph_hard/graphviz_38.txt b/test/graphviz/graph_hard/graphviz_38.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4e45c337a046a501323997009229f003daa0ff25
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_38.txt
@@ -0,0 +1,41 @@
+<Brokerage License Renewal, connectedTo, Price Negotiation>
+<Closing Meeting, connectedTo, Renovation Planning>
+<Closing Meeting, partOf, Closing Meeting>
+<Commercial Lease Negotiation, connectedTo, Contract Review>
+<Contract Review, connectedTo, Loan Pre_Approval>
+<Contract Review, connectedTo, Mortgage Application Assistance>
+<Document Signing, connectedTo, Zoning Compliance>
+<Escrow Setup, connectedTo, Tax Assessment>
+<HOA Management, connectedTo, Closing Meeting>
+<HOA Management, partOf, HOA Management>
+<Investment Property Analysis, connectedTo, Brokerage License Renewal>
+<Investment Property Analysis, connectedTo, Commercial Lease Negotiation>
+<Investment Property Analysis, connectedTo, Loan Pre_Approval>
+<Investment Property Analysis, connectedTo, Property Valuation>
+<Investment Property Analysis, zones, Document Signing>
+<Land Acquisition, connectedTo, Property Listing>
+<Legal Verification, connectedTo, Commercial Lease Negotiation>
+<Loan Pre_Approval, connectedTo, Virtual Tour Creation>
+<Maintenance Request, connectedTo, Rental Agreement>
+<Maintenance Request, partOf, Maintenance Request>
+<Mortgage Application Assistance, connectedTo, Site Visit Scheduling>
+<Price Negotiation, connectedTo, Legal Verification>
+<Price Negotiation, connectedTo, Loan Pre_Approval>
+<Property Management, connectedTo, HOA Management>
+<Property Management, connectedTo, Property Marketing>
+<Property Management, connectedTo, Site Visit Scheduling>
+<Property Marketing, connectedTo, Property Valuation>
+<Property Marketing, connectedTo, Site Visit Scheduling>
+<Property Valuation, connectedTo, Brokerage License Renewal>
+<Renovation Planning, connectedTo, Site Visit Scheduling>
+<Renovation Planning, partOf, Renovation Planning>
+<Rental Agreement, connectedTo, Virtual Tour Creation>
+<Rental Agreement, partOf, Rental Agreement>
+<Site Visit Scheduling, connectedTo, Loan Pre_Approval>
+<Site Visit Scheduling, verifies, Maintenance Request>
+<Tax Assessment, connectedTo, Land Acquisition>
+<Tenant Screening, closes, Property Management>
+<Virtual Tour Creation, connectedTo, Escrow Setup>
+<Virtual Tour Creation, connectedTo, Property Listing>
+<Virtual Tour Creation, connectedTo, Tax Assessment>
+<Zoning Compliance, connectedTo, Tenant Screening>
diff --git a/test/graphviz/graph_hard/graphviz_4.dot b/test/graphviz/graph_hard/graphviz_4.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1fa1d191f699ee43af48c06489943e0dbbf8da1b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_4.dot
@@ -0,0 +1,56 @@
+digraph {
+	rankdir=TD
+	N0 [label="Insurance Claim" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N1 [label=Diagnosis color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N2 [label="Patient Transfer" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N3 [label=Referral color="#80DDEA" fillcolor="#D3F7F9" shape=Mdiamond style=filled]
+	N4 [label=Biopsy color="#DCE775" fillcolor="#FCFCE7" shape=octagon style=filled]
+	N5 [label="Imaging Scan" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N6 [label="Genetic Counseling" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N7 [label="Dental Check_up" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N8 [label="Telemedicine Consultation" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	S1 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Rehabilitation Therapy" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Medical History" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+		nest0_1 [label=Follow_up color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+		nest0_2 [label=Vaccination color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+		nest0_3 [label="Patient Education" color="#A1887F" fillcolor="#EFEBE9" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Pharmacy Order" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Prescription color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+		nest1_1 [label="Lab Test" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+		nest1_2 [label="Anesthesia Administration" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+		nest1_3 [label="Nutritional Counseling" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=administers color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=claims color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N1 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N5 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [label=assesses color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_4.txt b/test/graphviz/graph_hard/graphviz_4.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a2da15efc40e4c3c6193a14615f9cd6e3aef7a78
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_4.txt
@@ -0,0 +1,32 @@
+<Anesthesia Administration, connectedTo, Nutritional Counseling>
+<Anesthesia Administration, partOf, Anesthesia Administration>
+<Biopsy, connectedTo, Imaging Scan>
+<Biopsy, connectedTo, Prescription>
+<Dental Check_up, connectedTo, Telemedicine Consultation>
+<Diagnosis, assesses, Referral>
+<Diagnosis, connectedTo, Biopsy>
+<Diagnosis, connectedTo, Genetic Counseling>
+<Diagnosis, connectedTo, Imaging Scan>
+<Diagnosis, connectedTo, Patient Transfer>
+<Diagnosis, connectedTo, Referral>
+<Follow_up, connectedTo, Vaccination>
+<Follow_up, partOf, Follow_up>
+<Genetic Counseling, connectedTo, Dental Check_up>
+<Imaging Scan, claims, Genetic Counseling>
+<Insurance Claim, connectedTo, Diagnosis>
+<Insurance Claim, connectedTo, Referral>
+<Lab Test, connectedTo, Anesthesia Administration>
+<Lab Test, partOf, Lab Test>
+<Medical History, connectedTo, Follow_up>
+<Medical History, partOf, Medical History>
+<Nutritional Counseling, connectedTo, Imaging Scan>
+<Nutritional Counseling, partOf, Nutritional Counseling>
+<Patient Education, connectedTo, Diagnosis>
+<Patient Education, partOf, Patient Education>
+<Patient Transfer, administers, Referral>
+<Patient Transfer, connectedTo, Medical History>
+<Prescription, connectedTo, Lab Test>
+<Prescription, partOf, Prescription>
+<Referral, connectedTo, Biopsy>
+<Vaccination, connectedTo, Patient Education>
+<Vaccination, partOf, Vaccination>
diff --git a/test/graphviz/graph_hard/graphviz_40.dot b/test/graphviz/graph_hard/graphviz_40.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6b9b7d9ef0730c96ded1e19a9815407142467299
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_40.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=BT
+	N0 [label="SWAT Team Activation" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Search and Rescue Operations" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N2 [label="Court Testimony" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N3 [label="Shelter Setup" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N4 [label="Emergency Medical Service" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N5 [label="Hazard Detection" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N6 [label="Traffic Control" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	S0 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Threat Assessment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="First Aid Deployment" color="#3F51B5" fillcolor="#C5CAE9" shape=plaintext style=filled]
+		nest0_1 [label="Inmate Transport" color="#3F51B5" fillcolor="#C5CAE9" shape=octagon style=filled]
+		nest0_2 [label="Crime Scene Analysis" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+		nest0_3 [label="Emergency Dispatch" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=maintains color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Law Enforcement Database Check" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Evidence Collection" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+		nest1_1 [label="Resource Allocation" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+		nest1_2 [label="K9 Unit Deployment" color="#AB47BC" fillcolor="#F3E5F5" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N3 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N3 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [label=arrests color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [label=collaborates color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N1 -> S2 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N5 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N6 [label=detects color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N3 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N4 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	M2 -> N5 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_40.txt b/test/graphviz/graph_hard/graphviz_40.txt
new file mode 100644
index 0000000000000000000000000000000000000000..579d37c0e26820ccfea3b9a725adf56b62aef116
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_40.txt
@@ -0,0 +1,32 @@
+<Court Testimony, connectedTo, First Aid Deployment>
+<Court Testimony, connectedTo, Shelter Setup>
+<Crime Scene Analysis, connectedTo, Emergency Dispatch>
+<Crime Scene Analysis, partOf, Crime Scene Analysis>
+<Emergency Dispatch, connectedTo, Shelter Setup>
+<Emergency Dispatch, partOf, Emergency Dispatch>
+<Emergency Medical Service, connectedTo, Hazard Detection>
+<Evidence Collection, connectedTo, Resource Allocation>
+<Evidence Collection, partOf, Evidence Collection>
+<First Aid Deployment, connectedTo, Inmate Transport>
+<First Aid Deployment, partOf, First Aid Deployment>
+<Hazard Detection, connectedTo, Evidence Collection>
+<Hazard Detection, connectedTo, Traffic Control>
+<Inmate Transport, maintains, Crime Scene Analysis>
+<Inmate Transport, partOf, Inmate Transport>
+<K9 Unit Deployment, connectedTo, Shelter Setup>
+<K9 Unit Deployment, partOf, K9 Unit Deployment>
+<Resource Allocation, connectedTo, K9 Unit Deployment>
+<Resource Allocation, partOf, Resource Allocation>
+<SWAT Team Activation, connectedTo, Hazard Detection>
+<SWAT Team Activation, connectedTo, Search and Rescue Operations>
+<SWAT Team Activation, connectedTo, Shelter Setup>
+<Search and Rescue Operations, connectedTo, Court Testimony>
+<Search and Rescue Operations, connectedTo, Emergency Medical Service>
+<Search and Rescue Operations, connectedTo, Hazard Detection>
+<Search and Rescue Operations, connectedTo, Shelter Setup>
+<Search and Rescue Operations, detects, Traffic Control>
+<Shelter Setup, arrests, Hazard Detection>
+<Shelter Setup, collaborates, Traffic Control>
+<Shelter Setup, connectedTo, Emergency Medical Service>
+<Shelter Setup, connectedTo, Hazard Detection>
+<Shelter Setup, connectedTo, Traffic Control>
diff --git a/test/graphviz/graph_hard/graphviz_42.txt b/test/graphviz/graph_hard/graphviz_42.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b18fcefd6c2e4fd68ec78f977b6d5d9d78970918
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_42.txt
@@ -0,0 +1,45 @@
+<Community Outreach, connectedTo, First Aid Deployment>
+<Community Outreach, partOf, Community Outreach>
+<Crime Prevention Programs, connectedTo, Evacuation Planning>
+<Crime Prevention Programs, partOf, Crime Prevention Programs>
+<Crime Scene Analysis, connectedTo, Community Outreach>
+<Crime Scene Analysis, connectedTo, Cybersecurity Threat Response>
+<Crime Scene Analysis, connectedTo, Hostage Negotiation>
+<Cybersecurity Threat Response, connectedTo, Emergency Medical Service>
+<Disaster Relief Coordination, connectedTo, Cybersecurity Threat Response>
+<Disaster Relief Coordination, connectedTo, Emergency Dispatch>
+<Disaster Relief Coordination, connectedTo, Public Safety Training>
+<Disaster Relief Coordination, connectedTo, Rescue Coordination>
+<Emergency Dispatch, connectedTo, Crime Prevention Programs>
+<Emergency Dispatch, connectedTo, Cybersecurity Threat Response>
+<Emergency Medical Service, trains, Public Safety Training>
+<Evacuation Planning, connectedTo, Evidence Collection>
+<Evacuation Planning, partOf, Evacuation Planning>
+<Evidence Collection, connectedTo, Fire Suppression>
+<Evidence Collection, partOf, Evidence Collection>
+<Fire Suppression, connectedTo, Crime Scene Analysis>
+<Fire Suppression, connectedTo, Emergency Dispatch>
+<Fire Suppression, connectedTo, Hostage Negotiation>
+<Fire Suppression, connectedTo, Resource Allocation>
+<First Aid Deployment, connectedTo, Responder Alert>
+<First Aid Deployment, partOf, First Aid Deployment>
+<Hostage Negotiation, connectedTo, Threat Assessment>
+<Incident Reporting, connectedTo, Resource Allocation>
+<Incident Reporting, partOf, Incident Reporting>
+<K9 Unit Deployment, connectedTo, Cybersecurity Threat Response>
+<K9 Unit Deployment, connectedTo, Fire Suppression>
+<Post_Incident Review, connectedTo, Surveillance Review>
+<Public Safety Training, connectedTo, Rescue Coordination>
+<Rescue Coordination, connectedTo, SWAT Team Activation>
+<Resource Allocation, connectedTo, Disaster Relief Coordination>
+<Resource Allocation, identifies, Cybersecurity Threat Response>
+<Responder Alert, connectedTo, Incident Reporting>
+<Responder Alert, partOf, Responder Alert>
+<Surveillance Review, certifies, Suspect Identification>
+<Surveillance Review, connectedTo, Cybersecurity Threat Response>
+<Suspect Identification, connectedTo, Emergency Dispatch>
+<Suspect Identification, connectedTo, Emergency Medical Service>
+<Suspect Identification, connectedTo, Public Safety Training>
+<Suspect Identification, connectedTo, Resource Allocation>
+<Threat Assessment, connectedTo, Cybersecurity Threat Response>
+<Threat Assessment, connectedTo, Post_Incident Review>
diff --git a/test/graphviz/graph_hard/graphviz_43.txt b/test/graphviz/graph_hard/graphviz_43.txt
new file mode 100644
index 0000000000000000000000000000000000000000..452989afd7b203066503f658b50423a4be5f27fc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_43.txt
@@ -0,0 +1,41 @@
+<Animation Production, connectedTo, Scene Scheduling>
+<Awards Ceremony Production, connectedTo, Set Construction>
+<Budget Planning, connectedTo, Costume Design>
+<Budget Planning, connectedTo, Live Performance>
+<Budget Planning, connectedTo, Location Scouting>
+<Budget Planning, connectedTo, Sound Engineering>
+<Budget Planning, connectedTo, Ticketing Sales>
+<Concert Promotion, connectedTo, Red Carpet Event>
+<Concert Promotion, partOf, Concert Promotion>
+<Costume Design, connectedTo, Live Performance>
+<Costume Design, performs, Sound Engineering>
+<Editing Process, connectedTo, Talent Management>
+<Editing Process, partOf, Editing Process>
+<Live Performance, connectedTo, Premiere Event>
+<Live Performance, connectedTo, Sound Engineering>
+<Location Scouting, connectedTo, Script Writing>
+<Location Scouting, connectedTo, Set Construction>
+<Location Scouting, connectedTo, Ticketing Sales>
+<Premiere Event, connectedTo, Press Junket>
+<Premiere Event, partOf, Premiere Event>
+<Press Junket, connectedTo, Concert Promotion>
+<Press Junket, partOf, Press Junket>
+<Red Carpet Event, connectedTo, Awards Ceremony Production>
+<Red Carpet Event, partOf, Red Carpet Event>
+<Scene Scheduling, connectedTo, Awards Ceremony Production>
+<Script Writing, archives, Editing Process>
+<Script Writing, partOf, Script Writing>
+<Sound Engineering, connectedTo, Animation Production>
+<Sound Engineering, connectedTo, Awards Ceremony Production>
+<Sound Engineering, connectedTo, Scene Scheduling>
+<Sound Engineering, connectedTo, Set Construction>
+<Sound Engineering, connectedTo, Trailer Production>
+<Sound Engineering, promotes, Scene Scheduling>
+<Talent Management, connectedTo, Budget Planning>
+<Talent Management, partOf, Talent Management>
+<Ticketing Sales, connectedTo, Sound Engineering>
+<Ticketing Sales, reviews, Costume Design>
+<Trailer Production, connectedTo, Animation Production>
+<Trailer Production, screens, Set Construction>
+<Visual Effects, connectedTo, Budget Planning>
+<Visual Effects, connectedTo, Sound Engineering>
diff --git a/test/graphviz/graph_hard/graphviz_44.dot b/test/graphviz/graph_hard/graphviz_44.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fa846ab7e39d80ef2bd6da6daac6c2ec02a0fa19
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_44.dot
@@ -0,0 +1,55 @@
+digraph {
+	rankdir=LR
+	N0 [label="Post_Production Audio Mixing" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Talent Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N2 [label="Live Performance" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N3 [label="Press Junket" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+	N4 [label="Fan Engagement Strategy" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N5 [label="Film Festival Submission" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N6 [label="Awards Ceremony Production" color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N7 [label="Actor Rehearsal" color="#FFF8A6" fillcolor="#FFFDE0" shape=Mdiamond style=filled]
+	N8 [label="Premiere Event" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	S1 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Ticketing Sales" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Intellectual Property Protection" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+		nest0_1 [label="Red Carpet Event" color="#FFF8A6" fillcolor="#FFFDE0" shape=plaintext style=filled]
+		nest0_2 [label="Budget Planning" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest0_3 [label="Scene Scheduling" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=critiques color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Film Distribution" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Casting Call" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+		nest1_1 [label="Licensing Approval" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+		nest1_2 [label="Costume Design" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_3 [label="Stunt Coordination" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [label=masters color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest1_3 -> nest1_0 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N4 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N6 [label=protects color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [label=audits color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_45.dot b/test/graphviz/graph_hard/graphviz_45.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1c4ba3f7ea8c66d9b807444fcc378d3db94e7bbb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_45.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=BT
+	N0 [label="Intellectual Property Protection" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N1 [label="Stunt Coordination" color="#FFDA4E" fillcolor="#FFE88D" shape=octagon style=filled]
+	N2 [label="Sponsorship Acquisition" color="#FFDA4E" fillcolor="#FFE88D" shape=hexagon style=filled]
+	N3 [label="Set Construction" color="#FFDA4E" fillcolor="#FFE88D" shape=diamond style=filled]
+	N4 [label="Visual Effects" color="#00BCD4" fillcolor="#E0F7FA" shape=plaintext style=filled]
+	N5 [label="Licensing Approval" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N6 [label="Fan Engagement Strategy" color="#82DAFF" fillcolor="#C8EDFF" shape=Mdiamond style=filled]
+	N7 [label="Red Carpet Event" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N8 [label="Script Writing" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Premiere Event" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Trailer Production" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+		nest0_1 [label="Location Scouting" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Editing Process" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Casting Call" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+		nest1_1 [label="Special Effects Design" color="#FFDA4E" fillcolor="#FFE88D" shape=hexagon style=filled]
+		nest1_2 [label="Footage Review" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+		nest1_3 [label="Marketing Campaign" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [label=streams color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=casts color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=distributes color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N6 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [label=renders color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_45.txt b/test/graphviz/graph_hard/graphviz_45.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1530a1a709e730e065f4e972fe2f3143f2184e51
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_45.txt
@@ -0,0 +1,32 @@
+<Casting Call, partOf, Casting Call>
+<Casting Call, streams, Special Effects Design>
+<Fan Engagement Strategy, connectedTo, Red Carpet Event>
+<Footage Review, connectedTo, Marketing Campaign>
+<Footage Review, partOf, Footage Review>
+<Intellectual Property Protection, casts, Stunt Coordination>
+<Licensing Approval, connectedTo, Fan Engagement Strategy>
+<Location Scouting, connectedTo, Fan Engagement Strategy>
+<Location Scouting, partOf, Location Scouting>
+<Marketing Campaign, connectedTo, Set Construction>
+<Marketing Campaign, partOf, Marketing Campaign>
+<Red Carpet Event, connectedTo, Trailer Production>
+<Red Carpet Event, distributes, Script Writing>
+<Set Construction, connectedTo, Casting Call>
+<Set Construction, connectedTo, Fan Engagement Strategy>
+<Set Construction, connectedTo, Visual Effects>
+<Special Effects Design, connectedTo, Footage Review>
+<Special Effects Design, partOf, Special Effects Design>
+<Sponsorship Acquisition, connectedTo, Fan Engagement Strategy>
+<Sponsorship Acquisition, connectedTo, Red Carpet Event>
+<Sponsorship Acquisition, connectedTo, Script Writing>
+<Sponsorship Acquisition, connectedTo, Set Construction>
+<Sponsorship Acquisition, connectedTo, Visual Effects>
+<Sponsorship Acquisition, renders, Visual Effects>
+<Stunt Coordination, connectedTo, Fan Engagement Strategy>
+<Stunt Coordination, connectedTo, Sponsorship Acquisition>
+<Stunt Coordination, connectedTo, Visual Effects>
+<Trailer Production, connectedTo, Location Scouting>
+<Trailer Production, partOf, Trailer Production>
+<Visual Effects, connectedTo, Fan Engagement Strategy>
+<Visual Effects, connectedTo, Licensing Approval>
+<Visual Effects, connectedTo, Red Carpet Event>
diff --git a/test/graphviz/graph_hard/graphviz_46.txt b/test/graphviz/graph_hard/graphviz_46.txt
new file mode 100644
index 0000000000000000000000000000000000000000..54fded50b662915f0323d95d47950a1e73363559
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_46.txt
@@ -0,0 +1,39 @@
+<Air Quality Monitoring, connectedTo, Renewable Energy Project Development>
+<Biodiversity Conservation, connectedTo, Renewable Energy Project Development>
+<Biodiversity Conservation, partOf, Biodiversity Conservation>
+<Climate Modeling, connectedTo, Environmental Education Programs>
+<Climate Modeling, connectedTo, Landfill Management>
+<Climate Modeling, partOf, Climate Modeling>
+<Conservation Easement, connectedTo, Pollution Alert>
+<Ecological Footprint Analysis, connectedTo, Conservation Easement>
+<Energy Audit, connectedTo, Air Quality Monitoring>
+<Environmental Education Programs, assesses, Soil Testing>
+<Environmental Impact Assessment, connectedTo, Air Quality Monitoring>
+<Environmental Impact Assessment, connectedTo, Energy Audit>
+<Environmental Impact Assessment, connectedTo, Waste Collection>
+<Green Certification, connectedTo, Wildlife Survey>
+<Hazardous Material Handling, connectedTo, Recycling Process>
+<Hazardous Material Handling, detects, Climate Modeling>
+<Landfill Management, connectedTo, Pollution Control Technology>
+<Landfill Management, partOf, Landfill Management>
+<Noise Pollution Measurement, connectedTo, Reforestation Planning>
+<Noise Pollution Measurement, partOf, Noise Pollution Measurement>
+<Ocean Cleanup, connectedTo, Hazardous Material Handling>
+<Pollution Alert, connectedTo, Resource Tracking>
+<Pollution Control Technology, connectedTo, Biodiversity Conservation>
+<Pollution Control Technology, partOf, Pollution Control Technology>
+<Recycling Process, connectedTo, Energy Audit>
+<Recycling Process, connectedTo, Environmental Impact Assessment>
+<Recycling Process, connectedTo, Regulatory Compliance>
+<Recycling Process, connectedTo, Waste Collection>
+<Reforestation Planning, connectedTo, Waste Collection>
+<Reforestation Planning, partOf, Reforestation Planning>
+<Regulatory Compliance, connectedTo, Noise Pollution Measurement>
+<Regulatory Compliance, funds, Species Reintroduction>
+<Renewable Energy Project Development, connectedTo, Regulatory Compliance>
+<Resource Tracking, connectedTo, Environmental Education Programs>
+<Soil Testing, connectedTo, Water Sampling>
+<Species Reintroduction, connectedTo, Waste Collection>
+<Waste Collection, connectedTo, Wildlife Survey>
+<Water Sampling, connectedTo, Ocean Cleanup>
+<Wildlife Survey, connectedTo, Ecological Footprint Analysis>
diff --git a/test/graphviz/graph_hard/graphviz_47.dot b/test/graphviz/graph_hard/graphviz_47.dot
new file mode 100644
index 0000000000000000000000000000000000000000..20b3141ab105214a126f8bec35458d894d58446e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_47.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=LR
+	N0 [label="Noise Pollution Measurement" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N1 [label="Environmental Education Programs" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N2 [label="Ecological Footprint Analysis" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N3 [label="Stormwater Management" color="#FFDA4E" fillcolor="#FFE88D" shape=octagon style=filled]
+	N4 [label="Species Reintroduction" color="#FFC107" fillcolor="#FFECB3" shape=Mdiamond style=filled]
+	N5 [label="Regulatory Compliance" color="#9575CD" fillcolor="#EDE7F6" shape=octagon style=filled]
+	N6 [label="Wildlife Survey" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	S0 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Sustainability Review" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Pollution Control Technology" color="#FFC107" fillcolor="#FFECB3" shape=Mdiamond style=filled]
+		nest0_1 [label="Air Quality Monitoring" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+		nest0_2 [label="Emission Reporting" color="#9575CD" fillcolor="#EDE7F6" shape=oval style=filled]
+		nest0_3 [label="Carbon Footprint Calculation" color="#FFC107" fillcolor="#FFECB3" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Policy Advocacy" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Citizen Science Initiative" color="#9575CD" fillcolor="#EDE7F6" shape=diamond style=filled]
+		nest1_1 [label="Ecosystem Restoration" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest1_2 [label="Hazardous Material Handling" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N4 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N3 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S2 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [label=reports color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N5 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_47.txt b/test/graphviz/graph_hard/graphviz_47.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3d2994794449af2e098ba666539106ce0376bd8f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_47.txt
@@ -0,0 +1,31 @@
+<Air Quality Monitoring, connectedTo, Emission Reporting>
+<Air Quality Monitoring, partOf, Air Quality Monitoring>
+<Carbon Footprint Calculation, connectedTo, Species Reintroduction>
+<Carbon Footprint Calculation, partOf, Carbon Footprint Calculation>
+<Citizen Science Initiative, connectedTo, Ecosystem Restoration>
+<Citizen Science Initiative, partOf, Citizen Science Initiative>
+<Ecological Footprint Analysis, connectedTo, Citizen Science Initiative>
+<Ecological Footprint Analysis, connectedTo, Regulatory Compliance>
+<Ecological Footprint Analysis, connectedTo, Stormwater Management>
+<Ecological Footprint Analysis, connectedTo, Wildlife Survey>
+<Ecosystem Restoration, connectedTo, Hazardous Material Handling>
+<Ecosystem Restoration, partOf, Ecosystem Restoration>
+<Emission Reporting, connectedTo, Carbon Footprint Calculation>
+<Emission Reporting, partOf, Emission Reporting>
+<Environmental Education Programs, connectedTo, Ecological Footprint Analysis>
+<Environmental Education Programs, connectedTo, Pollution Control Technology>
+<Environmental Education Programs, connectedTo, Regulatory Compliance>
+<Environmental Education Programs, connectedTo, Stormwater Management>
+<Hazardous Material Handling, connectedTo, Stormwater Management>
+<Hazardous Material Handling, partOf, Hazardous Material Handling>
+<Noise Pollution Measurement, connectedTo, Environmental Education Programs>
+<Noise Pollution Measurement, connectedTo, Stormwater Management>
+<Pollution Control Technology, connectedTo, Air Quality Monitoring>
+<Pollution Control Technology, partOf, Pollution Control Technology>
+<Regulatory Compliance, connectedTo, Wildlife Survey>
+<Species Reintroduction, connectedTo, Regulatory Compliance>
+<Species Reintroduction, connectedTo, Wildlife Survey>
+<Stormwater Management, connectedTo, Regulatory Compliance>
+<Stormwater Management, connectedTo, Species Reintroduction>
+<Stormwater Management, connectedTo, Wildlife Survey>
+<Stormwater Management, reports, Wildlife Survey>
diff --git a/test/graphviz/graph_hard/graphviz_48.dot b/test/graphviz/graph_hard/graphviz_48.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c3272b1b2423fa1121d3df1cf748955f7c24252e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_48.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=BT
+	N0 [label="Climate Modeling" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N1 [label="Waste Collection" color="#CFCFCF" fillcolor="#F6F6F6" shape=octagon style=filled]
+	N2 [label="Air Quality Monitoring" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N3 [label="Water Sampling" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+	N4 [label="Conservation Easement" color="#CFCFCF" fillcolor="#F6F6F6" shape=octagon style=filled]
+	N5 [label="Resource Tracking" color="#CFCFCF" fillcolor="#F6F6F6" shape=parallelogram style=filled]
+	N6 [label="Energy Audit" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N7 [label="Groundwater Monitoring" color="#9FA9E1" fillcolor="#D6D9F0" shape=octagon style=filled]
+	N8 [label="Reforestation Planning" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N9 [label="Resource Recovery" color="#4DD0E1" fillcolor="#C9F0F0" shape=oval style=filled]
+	N10 [label="Sustainability Review" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+	N11 [label="Noise Pollution Measurement" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N12 [label="Regulatory Compliance" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N13 [label="Soil Testing" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N14 [label="Carbon Footprint Calculation" color="#CFCFCF" fillcolor="#F6F6F6" shape=Mdiamond style=filled]
+	N15 [label="Environmental Impact Assessment" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	S0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Landfill Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Environmental Education Programs" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+		nest0_1 [label="Renewable Energy Grid Integration" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+		nest0_2 [label="Hazardous Material Handling" color="#4DD0E1" fillcolor="#C9F0F0" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Species Reintroduction" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Coastal Erosion Control" color="#CFCFCF" fillcolor="#F6F6F6" shape=parallelogram style=filled]
+		nest1_1 [label="Green Certification" color="#CFCFCF" fillcolor="#F6F6F6" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=researches color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=treats color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=funds color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N9 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [label=measures color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N1 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N11 -> M0 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N15 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_48.txt b/test/graphviz/graph_hard/graphviz_48.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ed9a1dcb2656a30f7547d4ada574f9b1e9e8f3dc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_48.txt
@@ -0,0 +1,37 @@
+<Air Quality Monitoring, connectedTo, Water Sampling>
+<Carbon Footprint Calculation, connectedTo, Environmental Impact Assessment>
+<Climate Modeling, connectedTo, Waste Collection>
+<Coastal Erosion Control, connectedTo, Green Certification>
+<Coastal Erosion Control, partOf, Coastal Erosion Control>
+<Conservation Easement, connectedTo, Energy Audit>
+<Conservation Easement, connectedTo, Reforestation Planning>
+<Conservation Easement, connectedTo, Sustainability Review>
+<Conservation Easement, treats, Resource Tracking>
+<Energy Audit, connectedTo, Environmental Impact Assessment>
+<Energy Audit, connectedTo, Groundwater Monitoring>
+<Environmental Education Programs, connectedTo, Renewable Energy Grid Integration>
+<Environmental Education Programs, partOf, Environmental Education Programs>
+<Green Certification, connectedTo, Waste Collection>
+<Green Certification, partOf, Green Certification>
+<Groundwater Monitoring, connectedTo, Reforestation Planning>
+<Hazardous Material Handling, connectedTo, Resource Recovery>
+<Hazardous Material Handling, partOf, Hazardous Material Handling>
+<Noise Pollution Measurement, connectedTo, Environmental Impact Assessment>
+<Noise Pollution Measurement, funds, Regulatory Compliance>
+<Reforestation Planning, connectedTo, Resource Recovery>
+<Regulatory Compliance, connectedTo, Soil Testing>
+<Renewable Energy Grid Integration, connectedTo, Hazardous Material Handling>
+<Renewable Energy Grid Integration, partOf, Renewable Energy Grid Integration>
+<Resource Recovery, connectedTo, Sustainability Review>
+<Resource Tracking, connectedTo, Energy Audit>
+<Soil Testing, connectedTo, Carbon Footprint Calculation>
+<Sustainability Review, connectedTo, Noise Pollution Measurement>
+<Waste Collection, connectedTo, Air Quality Monitoring>
+<Waste Collection, connectedTo, Conservation Easement>
+<Waste Collection, connectedTo, Environmental Impact Assessment>
+<Waste Collection, connectedTo, Resource Recovery>
+<Waste Collection, connectedTo, Resource Tracking>
+<Waste Collection, connectedTo, Soil Testing>
+<Waste Collection, measures, Coastal Erosion Control>
+<Water Sampling, connectedTo, Environmental Education Programs>
+<Water Sampling, researches, Conservation Easement>
diff --git a/test/graphviz/graph_hard/graphviz_49.dot b/test/graphviz/graph_hard/graphviz_49.dot
new file mode 100644
index 0000000000000000000000000000000000000000..14386ca695b25485e283556db9f64a2a464d8318
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_49.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=RL
+	N0 [label="Budget Allocation" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N1 [label="Public Sector Procurement" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N2 [label="Public Works Maintenance" color="#4FC3F7" fillcolor="#E1F5FE" shape=Mdiamond style=filled]
+	N3 [label="Census Collection" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N4 [label="Border Control" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N5 [label="Social Program Review" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N6 [label="Open Government Data Initiative" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N7 [label="Whistleblower Protection" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N8 [label="Passport Issuance" color="#4FC3F7" fillcolor="#E1F5FE" shape=oval style=filled]
+	N9 [label="Vehicle Registration" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N10 [label="Transparency Audit" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	S0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4FC3F7" fillcolor="#E1F5FE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Education Policy" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Legislation Review" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+		nest0_1 [label="Code Enforcement" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+		nest0_2 [label="Service Registration" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+		nest0_3 [label="Driver's License Renewal" color="#4FC3F7" fillcolor="#E1F5FE" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Tax Filing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Urban Planning" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+		nest1_1 [label="Data Publishing" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+		nest1_2 [label="Election Management" color="#FFF9AE" fillcolor="#FFFCE6" shape=Mdiamond style=filled]
+		nest1_3 [label="Public Records Request" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=communicates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=drafts color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N10 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_49.txt b/test/graphviz/graph_hard/graphviz_49.txt
new file mode 100644
index 0000000000000000000000000000000000000000..91f4ce52e10f84804c7b32d46fa29f5d8f0ad610
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_49.txt
@@ -0,0 +1,39 @@
+<Border Control, connectedTo, Social Program Review>
+<Budget Allocation, connectedTo, Open Government Data Initiative>
+<Budget Allocation, connectedTo, Public Sector Procurement>
+<Census Collection, connectedTo, Border Control>
+<Census Collection, connectedTo, Open Government Data Initiative>
+<Census Collection, connectedTo, Transparency Audit>
+<Census Collection, connectedTo, Vehicle Registration>
+<Census Collection, connectedTo, Whistleblower Protection>
+<Code Enforcement, connectedTo, Service Registration>
+<Code Enforcement, partOf, Code Enforcement>
+<Data Publishing, connectedTo, Election Management>
+<Data Publishing, partOf, Data Publishing>
+<Driver's License Renewal, connectedTo, Transparency Audit>
+<Driver's License Renewal, partOf, Driver's License Renewal>
+<Election Management, connectedTo, Public Records Request>
+<Election Management, partOf, Election Management>
+<Legislation Review, connectedTo, Code Enforcement>
+<Legislation Review, partOf, Legislation Review>
+<Open Government Data Initiative, connectedTo, Passport Issuance>
+<Open Government Data Initiative, connectedTo, Transparency Audit>
+<Open Government Data Initiative, connectedTo, Vehicle Registration>
+<Open Government Data Initiative, connectedTo, Whistleblower Protection>
+<Passport Issuance, connectedTo, Legislation Review>
+<Passport Issuance, drafts, Vehicle Registration>
+<Public Records Request, connectedTo, Passport Issuance>
+<Public Records Request, partOf, Public Records Request>
+<Public Sector Procurement, connectedTo, Border Control>
+<Public Sector Procurement, connectedTo, Open Government Data Initiative>
+<Public Sector Procurement, connectedTo, Public Works Maintenance>
+<Public Works Maintenance, connectedTo, Border Control>
+<Public Works Maintenance, connectedTo, Census Collection>
+<Service Registration, connectedTo, Driver's License Renewal>
+<Service Registration, partOf, Service Registration>
+<Social Program Review, communicates, Open Government Data Initiative>
+<Urban Planning, connectedTo, Data Publishing>
+<Urban Planning, partOf, Urban Planning>
+<Vehicle Registration, connectedTo, Transparency Audit>
+<Whistleblower Protection, connectedTo, Passport Issuance>
+<Whistleblower Protection, connectedTo, Urban Planning>
diff --git a/test/graphviz/graph_hard/graphviz_52.dot b/test/graphviz/graph_hard/graphviz_52.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ad2c8954d8ed5f382eb3c49d05578433ec33ef50
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_52.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=RL
+	N0 [label="Supplier Coordination" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Complaint Management" color="#C0CA33" fillcolor="#F9FBE7" shape=plaintext style=filled]
+	N2 [label="Warehouse Picking" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N3 [label="Customer Loyalty Analytics" color="#C0CA33" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+	N4 [label="Online Order Pickup" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N5 [label="Visual Merchandising" color="#B0C5CD" fillcolor="#DFE7EB" shape=Mdiamond style=filled]
+	N6 [label="E_commerce Platform Integration" color="#795548" fillcolor="#D7CCC8" shape=oval style=filled]
+	N7 [label="Supply Chain Optimization" color="#795548" fillcolor="#D7CCC8" shape=folder style=filled]
+	N8 [label="Gift Wrapping" color="#C0CA33" fillcolor="#F9FBE7" shape=folder style=filled]
+	N9 [label="Shelf Restocking" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+	N10 [label="Shopping Cart Collection" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N11 [label="Point of Sale System Update" color="#795548" fillcolor="#D7CCC8" shape=diamond style=filled]
+	N12 [label="Fitting Room Management" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	S1 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Security Tagging" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Payment Processing" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+		nest0_1 [label="Barcode Scanning" color="#C0CA33" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+		nest0_2 [label="Vendor Managed Inventory" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#795548" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Curbside Delivery" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Stock Replenishment" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+		nest1_1 [label="Promotion Planning" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=packs color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=secures color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N3 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S2 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [label=complies color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [label=displays color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	M2 -> N4 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_52.txt b/test/graphviz/graph_hard/graphviz_52.txt
new file mode 100644
index 0000000000000000000000000000000000000000..46e441756eb7a3a67c5c87df20674246ff9f9a9c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_52.txt
@@ -0,0 +1,34 @@
+<Barcode Scanning, connectedTo, Vendor Managed Inventory>
+<Barcode Scanning, partOf, Barcode Scanning>
+<Complaint Management, connectedTo, Warehouse Picking>
+<Complaint Management, displays, Online Order Pickup>
+<Customer Loyalty Analytics, connectedTo, E_commerce Platform Integration>
+<Customer Loyalty Analytics, connectedTo, Gift Wrapping>
+<Customer Loyalty Analytics, connectedTo, Online Order Pickup>
+<Customer Loyalty Analytics, connectedTo, Supply Chain Optimization>
+<Customer Loyalty Analytics, connectedTo, Visual Merchandising>
+<E_commerce Platform Integration, connectedTo, Stock Replenishment>
+<E_commerce Platform Integration, connectedTo, Supply Chain Optimization>
+<Gift Wrapping, secures, Shelf Restocking>
+<Online Order Pickup, packs, Visual Merchandising>
+<Payment Processing, connectedTo, Barcode Scanning>
+<Payment Processing, partOf, Payment Processing>
+<Point of Sale System Update, connectedTo, Fitting Room Management>
+<Promotion Planning, connectedTo, Shelf Restocking>
+<Promotion Planning, partOf, Promotion Planning>
+<Shelf Restocking, connectedTo, Shopping Cart Collection>
+<Shopping Cart Collection, connectedTo, Point of Sale System Update>
+<Stock Replenishment, connectedTo, Promotion Planning>
+<Stock Replenishment, partOf, Stock Replenishment>
+<Supplier Coordination, complies, Online Order Pickup>
+<Supplier Coordination, connectedTo, Complaint Management>
+<Supplier Coordination, connectedTo, E_commerce Platform Integration>
+<Supply Chain Optimization, connectedTo, Gift Wrapping>
+<Vendor Managed Inventory, connectedTo, Customer Loyalty Analytics>
+<Vendor Managed Inventory, partOf, Vendor Managed Inventory>
+<Visual Merchandising, connectedTo, E_commerce Platform Integration>
+<Visual Merchandising, connectedTo, Payment Processing>
+<Warehouse Picking, connectedTo, Customer Loyalty Analytics>
+<Warehouse Picking, connectedTo, E_commerce Platform Integration>
+<Warehouse Picking, connectedTo, Gift Wrapping>
+<Warehouse Picking, connectedTo, Point of Sale System Update>
diff --git a/test/graphviz/graph_hard/graphviz_53.dot b/test/graphviz/graph_hard/graphviz_53.dot
new file mode 100644
index 0000000000000000000000000000000000000000..029c3d59c3cfee483ac2f115074f788ce6220104
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_53.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=RL
+	N0 [label="Return Handling" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N1 [label="Promotion Planning" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N2 [label="Customer Loyalty Analytics" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N3 [label="Security Tagging" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N4 [label="Stock Replenishment" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N5 [label="Sales Forecasting" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N6 [label="Inventory Check" color="#A188D0" fillcolor="#DACBE3" shape=Mdiamond style=filled]
+	N7 [label="Vendor Managed Inventory" color="#A1D7CD" fillcolor="#EDF5F3" shape=Mdiamond style=filled]
+	N8 [label="Customer Checkout" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N9 [label="Gift Wrapping" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N10 [label="Fitting Room Management" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N11 [label="Order Fulfillment" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N12 [label="Staff Training" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	S0 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Receipt Issuing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Warehouse Picking" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+		nest0_1 [label="Point of Sale System Update" color="#A1D7CD" fillcolor="#EDF5F3" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Shelf Restocking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Payment Processing" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest1_1 [label="Seasonal Sales Planning" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+		nest1_2 [label="Customer Engagement" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest1_3 [label="Self_Checkout Assistance" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [label=advertises color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=complies color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=reports color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N11 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N3 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N8 -> S0 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S2 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N10 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [label=audits color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M2 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	M2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_53.txt b/test/graphviz/graph_hard/graphviz_53.txt
new file mode 100644
index 0000000000000000000000000000000000000000..dcb8ac95a667809328b3308724dbb593cfca27fa
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_53.txt
@@ -0,0 +1,39 @@
+<Customer Checkout, connectedTo, Fitting Room Management>
+<Customer Checkout, connectedTo, Gift Wrapping>
+<Customer Checkout, connectedTo, Order Fulfillment>
+<Customer Engagement, advertises, Self_Checkout Assistance>
+<Customer Engagement, partOf, Customer Engagement>
+<Customer Loyalty Analytics, connectedTo, Customer Checkout>
+<Customer Loyalty Analytics, connectedTo, Fitting Room Management>
+<Customer Loyalty Analytics, connectedTo, Security Tagging>
+<Fitting Room Management, connectedTo, Order Fulfillment>
+<Gift Wrapping, connectedTo, Fitting Room Management>
+<Inventory Check, connectedTo, Customer Checkout>
+<Inventory Check, connectedTo, Vendor Managed Inventory>
+<Inventory Check, connectedTo, Warehouse Picking>
+<Order Fulfillment, connectedTo, Staff Training>
+<Payment Processing, connectedTo, Seasonal Sales Planning>
+<Payment Processing, partOf, Payment Processing>
+<Point of Sale System Update, connectedTo, Order Fulfillment>
+<Point of Sale System Update, partOf, Point of Sale System Update>
+<Promotion Planning, connectedTo, Customer Loyalty Analytics>
+<Promotion Planning, connectedTo, Fitting Room Management>
+<Promotion Planning, connectedTo, Gift Wrapping>
+<Promotion Planning, connectedTo, Stock Replenishment>
+<Return Handling, connectedTo, Promotion Planning>
+<Return Handling, connectedTo, Stock Replenishment>
+<Sales Forecasting, audits, Customer Checkout>
+<Sales Forecasting, connectedTo, Inventory Check>
+<Seasonal Sales Planning, connectedTo, Customer Engagement>
+<Seasonal Sales Planning, partOf, Seasonal Sales Planning>
+<Security Tagging, complies, Stock Replenishment>
+<Self_Checkout Assistance, connectedTo, Security Tagging>
+<Self_Checkout Assistance, partOf, Self_Checkout Assistance>
+<Stock Replenishment, connectedTo, Sales Forecasting>
+<Vendor Managed Inventory, connectedTo, Fitting Room Management>
+<Vendor Managed Inventory, connectedTo, Order Fulfillment>
+<Vendor Managed Inventory, connectedTo, Payment Processing>
+<Vendor Managed Inventory, connectedTo, Staff Training>
+<Vendor Managed Inventory, reports, Customer Checkout>
+<Warehouse Picking, connectedTo, Point of Sale System Update>
+<Warehouse Picking, partOf, Warehouse Picking>
diff --git a/test/graphviz/graph_hard/graphviz_54.txt b/test/graphviz/graph_hard/graphviz_54.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c3392edaaf564c768aa01f173b5620fa73969b81
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_54.txt
@@ -0,0 +1,36 @@
+<Complaint Management, connectedTo, Receipt Issuing>
+<Complaint Management, connectedTo, Return Handling>
+<Complaint Management, connectedTo, Stock Replenishment>
+<Customer Survey, connectedTo, Receipt Issuing>
+<E_commerce Platform Integration, connectedTo, Seasonal Sales Planning>
+<E_commerce Platform Integration, partOf, E_commerce Platform Integration>
+<Gift Wrapping, connectedTo, Receipt Issuing>
+<Gift Wrapping, connectedTo, Visual Merchandising>
+<Loss Prevention, connectedTo, Complaint Management>
+<Online Order Pickup, connectedTo, Customer Survey>
+<Online Order Pickup, partOf, Online Order Pickup>
+<Order Fulfillment, connectedTo, Loss Prevention>
+<Point of Sale System Update, connectedTo, Loss Prevention>
+<Point of Sale System Update, connectedTo, Order Fulfillment>
+<Return Handling, connectedTo, Supplier Payment>
+<Seasonal Sales Planning, connectedTo, Store Layout Design>
+<Seasonal Sales Planning, partOf, Seasonal Sales Planning>
+<Self_Checkout Assistance, connectedTo, Gift Wrapping>
+<Self_Checkout Assistance, connectedTo, Loss Prevention>
+<Self_Checkout Assistance, connectedTo, Order Fulfillment>
+<Self_Checkout Assistance, connectedTo, Point of Sale System Update>
+<Self_Checkout Assistance, connectedTo, Shopping Cart Collection>
+<Self_Checkout Assistance, connectedTo, Visual Merchandising>
+<Shelf Restocking, connectedTo, Shopping Cart Collection>
+<Shopping Cart Collection, connectedTo, Loss Prevention>
+<Shopping Cart Collection, connectedTo, Point of Sale System Update>
+<Stock Replenishment, connectedTo, Online Order Pickup>
+<Stock Replenishment, partOf, Stock Replenishment>
+<Store Layout Design, connectedTo, Complaint Management>
+<Store Layout Design, partOf, Store Layout Design>
+<Supplier Payment, connectedTo, Customer Survey>
+<Supplier Payment, connectedTo, E_commerce Platform Integration>
+<Visual Merchandising, connectedTo, Complaint Management>
+<Visual Merchandising, connectedTo, Loss Prevention>
+<Visual Merchandising, connectedTo, Point of Sale System Update>
+<Visual Merchandising, connectedTo, Shelf Restocking>
diff --git a/test/graphviz/graph_hard/graphviz_56.dot b/test/graphviz/graph_hard/graphviz_56.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9f54ee8a06ee387479ed99654483ce2cdadb07a4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_56.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=RL
+	N0 [label="Vehicle Design" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N1 [label="Robotics in Production" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N2 [label="Recycling of Vehicle Components" color="#A188DB" fillcolor="#DED7F0" shape=octagon style=filled]
+	N3 [label="Vehicle Financing" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N4 [label="Electric Vehicle Battery Production" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+	N5 [label="Warranty Activation" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N6 [label="Fluid Level Check" color="#5C6BC0" fillcolor="#E8EAF6" shape=diamond style=filled]
+	N7 [label="Supplier Selection" color="#A188DB" fillcolor="#DED7F0" shape=diamond style=filled]
+	N8 [label="Fuel Efficiency Check" color="#5C6BC0" fillcolor="#E8EAF6" shape=octagon style=filled]
+	N9 [label="Body Shop Repair" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N10 [label="Spare Parts Order" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N11 [label="Vehicle Connectivity" color="#A188DB" fillcolor="#DED7F0" shape=diamond style=filled]
+	N12 [label="Crash Simulation" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N13 [label="Customer Test Drive" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	S1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Parts Distribution" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Diagnostic Trouble Code Reading" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+		nest0_1 [label="Brake System Check" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Customer Relationship Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Assembly Line Setup" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest1_1 [label="Emission Testing" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+		nest1_2 [label="Dealership Sales" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=distributes color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N10 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [label=supports color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N4 [label=schedules color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_56.txt b/test/graphviz/graph_hard/graphviz_56.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f568ac667bf80dd97aa03e83deadf8a4bfe6ca32
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_56.txt
@@ -0,0 +1,33 @@
+<Assembly Line Setup, connectedTo, Emission Testing>
+<Assembly Line Setup, partOf, Assembly Line Setup>
+<Body Shop Repair, connectedTo, Diagnostic Trouble Code Reading>
+<Body Shop Repair, connectedTo, Spare Parts Order>
+<Brake System Check, connectedTo, Spare Parts Order>
+<Brake System Check, partOf, Brake System Check>
+<Crash Simulation, connectedTo, Customer Test Drive>
+<Dealership Sales, partOf, Dealership Sales>
+<Dealership Sales, schedules, Electric Vehicle Battery Production>
+<Diagnostic Trouble Code Reading, connectedTo, Brake System Check>
+<Diagnostic Trouble Code Reading, partOf, Diagnostic Trouble Code Reading>
+<Electric Vehicle Battery Production, connectedTo, Warranty Activation>
+<Emission Testing, connectedTo, Dealership Sales>
+<Emission Testing, partOf, Emission Testing>
+<Fluid Level Check, connectedTo, Supplier Selection>
+<Fuel Efficiency Check, connectedTo, Body Shop Repair>
+<Recycling of Vehicle Components, connectedTo, Electric Vehicle Battery Production>
+<Recycling of Vehicle Components, connectedTo, Fluid Level Check>
+<Recycling of Vehicle Components, connectedTo, Fuel Efficiency Check>
+<Recycling of Vehicle Components, connectedTo, Supplier Selection>
+<Recycling of Vehicle Components, connectedTo, Vehicle Financing>
+<Robotics in Production, connectedTo, Fluid Level Check>
+<Robotics in Production, connectedTo, Recycling of Vehicle Components>
+<Robotics in Production, connectedTo, Vehicle Financing>
+<Spare Parts Order, connectedTo, Vehicle Connectivity>
+<Supplier Selection, connectedTo, Fuel Efficiency Check>
+<Supplier Selection, supports, Assembly Line Setup>
+<Vehicle Connectivity, distributes, Crash Simulation>
+<Vehicle Design, connectedTo, Robotics in Production>
+<Vehicle Design, connectedTo, Vehicle Financing>
+<Vehicle Financing, connectedTo, Electric Vehicle Battery Production>
+<Vehicle Financing, connectedTo, Fluid Level Check>
+<Warranty Activation, connectedTo, Fluid Level Check>
diff --git a/test/graphviz/graph_hard/graphviz_57.dot b/test/graphviz/graph_hard/graphviz_57.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b0a2ce6755dd50a3515d739c9c27c2e74b58ce2a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_57.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=LR
+	N0 [label="Vehicle Financing" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label="Vehicle Design" color="#FFB2A5" fillcolor="#FFDCD6" shape=parallelogram style=filled]
+	N2 [label="Brake System Check" color="#FFB2A5" fillcolor="#FFDCD6" shape=Mdiamond style=filled]
+	N3 [label="Spare Parts Order" color="#FFC2C2" fillcolor="#FFEBEB" shape=diamond style=filled]
+	N4 [label="Engine Installation" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N5 [label="Oil Change" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N6 [label="Assembly Line Setup" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N7 [label="Fluid Level Check" color="#C2B2F0" fillcolor="#EFE6FF" shape=oval style=filled]
+	N8 [label="Emission Testing" color="#C2B2F0" fillcolor="#EFE6FF" shape=folder style=filled]
+	N9 [label="Component Testing" color="#FFC2C2" fillcolor="#FFEBEB" shape=oval style=filled]
+	N10 [label="Global Supply Chain Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N11 [label="Supplier Selection" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	S0 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Part Manufacturing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="After_sales Service" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_1 [label="Software Calibration" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_2 [label="Recall Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=audits color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Road Testing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Robotics in Production" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+		nest1_1 [label="Parts Distribution" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+		nest1_2 [label="Vehicle Connectivity" color="#FFB2A5" fillcolor="#FFDCD6" shape=parallelogram style=filled]
+		nest1_3 [label="Customer Relationship Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=schedules color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N4 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N8 -> S1 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N6 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_58.txt b/test/graphviz/graph_hard/graphviz_58.txt
new file mode 100644
index 0000000000000000000000000000000000000000..83e483a30d563766a0a07cad8cc12847bf158d2e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_58.txt
@@ -0,0 +1,34 @@
+<Air Traffic Control Integration, connectedTo, Aircraft Maintenance Log>
+<Air Traffic Control Integration, connectedTo, Drone System Development>
+<Air Traffic Control Integration, connectedTo, Rocket Stage Separation>
+<Air Traffic Control Integration, connectedTo, System Reboot>
+<Aircraft Maintenance Log, connectedTo, Drone System Development>
+<Aircraft Manufacturing, connectedTo, Aircraft Maintenance Log>
+<Aircraft Manufacturing, connectedTo, Astronaut Training>
+<Aircraft Manufacturing, connectedTo, Drone System Development>
+<Aircraft Manufacturing, connectedTo, Rocket Stage Separation>
+<Astronaut Training, connectedTo, Air Traffic Control Integration>
+<Astronaut Training, connectedTo, International Space Station Resupply>
+<Astronaut Training, connectedTo, Rocket Stage Separation>
+<Aviation Safety Audit, connectedTo, Aircraft Maintenance Log>
+<Aviation Safety Audit, partOf, Aviation Safety Audit>
+<Drone System Development, connectedTo, System Reboot>
+<Emergency Protocols, connectedTo, Flight Crew Training>
+<Extravehicular Activity Planning, connectedTo, Fueling Procedure>
+<Extravehicular Activity Planning, partOf, Extravehicular Activity Planning>
+<Flight Crew Training, connectedTo, Air Traffic Control Integration>
+<Flight Crew Training, connectedTo, Propulsion Testing>
+<Flight Crew Training, connectedTo, Rocket Assembly>
+<Flight Crew Training, connectedTo, Rocket Stage Separation>
+<Flight Simulation, connectedTo, System Reboot>
+<Flight Simulation, partOf, Flight Simulation>
+<Fueling Procedure, connectedTo, Re_entry Vehicle Design>
+<Fueling Procedure, partOf, Fueling Procedure>
+<International Space Station Resupply, connectedTo, Air Traffic Control Integration>
+<Propulsion Testing, connectedTo, Aircraft Manufacturing>
+<Propulsion Testing, connectedTo, Extravehicular Activity Planning>
+<Re_entry Vehicle Design, connectedTo, Aviation Safety Audit>
+<Re_entry Vehicle Design, partOf, Re_entry Vehicle Design>
+<Rocket Assembly, connectedTo, Flight Simulation>
+<Rocket Assembly, partOf, Rocket Assembly>
+<Rocket Stage Separation, connectedTo, Aircraft Maintenance Log>
diff --git a/test/graphviz/graph_hard/graphviz_59.dot b/test/graphviz/graph_hard/graphviz_59.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b971836d7c78d11388cae3983787345cb7ee0f56
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_59.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=RL
+	N0 [label="Drone System Development" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N1 [label="Emergency Protocols" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N2 [label="Telemetry Setup" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N3 [label="Component Recovery" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N4 [label="Space Debris Tracking" color="#FFF9AE" fillcolor="#FFFCE6" shape=folder style=filled]
+	N5 [label="Airframe Assembly" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N6 [label="Spacecraft Telemetry Analysis" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+	N7 [label="Ground Station Coordination" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N8 [label="Orbit Adjustment" color="#BDBDBD" fillcolor="#F5F5F5" shape=octagon style=filled]
+	N9 [label="Thermal Shield Testing" color="#42A5F5" fillcolor="#F1F8FF" shape=folder style=filled]
+	N10 [label="Propulsion Testing" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	S0 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Countdown Sequence" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Air Traffic Control Integration" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+		nest0_1 [label="Hypersonic Flight Testing" color="#BDBDBD" fillcolor="#F5F5F5" shape=folder style=filled]
+		nest0_2 [label="Satellite Configuration" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Fueling Procedure" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Mission Planning" color="#BDBDBD" fillcolor="#F5F5F5" shape=octagon style=filled]
+		nest1_1 [label="Aircraft Maintenance Log" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N2 [label=prototypes color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N8 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [label=coordinates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [label=navigates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_6.dot b/test/graphviz/graph_hard/graphviz_6.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f9371b1e64f8cd12ae78664e5b8e11f988a97167
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_6.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=LR
+	N0 [label="Home Care Visit" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N1 [label="Nutritional Counseling" color="#388E3C" fillcolor="#F1F8E9" shape=folder style=filled]
+	N2 [label="Allergy Test" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N3 [label=Surgery color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N4 [label="Clinical Trial" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+	N5 [label="Medication Dispensing" color="#FFB2A5" fillcolor="#FFDCD6" shape=parallelogram style=filled]
+	N6 [label="Patient Transfer" color="#FFB2A5" fillcolor="#FFDCD6" shape=diamond style=filled]
+	N7 [label="Pain Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+	N8 [label="Mental Health Assessment" color="#FFB2A5" fillcolor="#FFDCD6" shape=plaintext style=filled]
+	N9 [label=Prescription color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N10 [label="Treatment Plan" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N11 [label="Imaging Scan" color="#80DDEA" fillcolor="#D3F7F9" shape=Mdiamond style=filled]
+	N12 [label=Biopsy color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Epidemiological Tracking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Triage color="#388E3C" fillcolor="#F1F8E9" shape=octagon style=filled]
+		nest0_1 [label=Referral color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+		nest0_2 [label="Case Review" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+		nest0_3 [label=Vaccination color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Lab Test" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Rehabilitation Therapy" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+		nest1_1 [label=Discharge color="#FFB2A5" fillcolor="#FFDCD6" shape=Mdiamond style=filled]
+		nest1_2 [label="Patient Intake" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [label=documents color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label=implements color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N8 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N8 [label=schedules color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N8 -> M0 [label=verifies color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [label=responds color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N10 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> M2 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	M2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_60.dot b/test/graphviz/graph_hard/graphviz_60.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d1a20fd0d2a2a3c9f7db9098068193f9ccf3eb4d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_60.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=LR
+	N0 [label="Payload Integration" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N1 [label="Aircraft Maintenance Log" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N2 [label="Drone System Development" color="#BDAFA8" fillcolor="#E4E0DF" shape=oval style=filled]
+	N3 [label="Satellite Configuration" color="#FFDA4E" fillcolor="#FFE88D" shape=plaintext style=filled]
+	N4 [label="Extravehicular Activity Planning" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N5 [label="Avionics Installation" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N6 [label="Mission Planning" color="#BDAFA8" fillcolor="#E4E0DF" shape=oval style=filled]
+	N7 [label="Countdown Sequence" color="#FF9800" fillcolor="#FFE0B2" shape=Mdiamond style=filled]
+	N8 [label="Launch Execution" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N9 [label="Orbit Adjustment" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N10 [label="Fueling Procedure" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N11 [label="Flight Simulation" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N12 [label="Structural Analysis" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+	N13 [label="Component Recovery" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N14 [label="System Reboot" color="#FF9800" fillcolor="#FFE0B2" shape=diamond style=filled]
+	N15 [label="Thermal Shield Testing" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N16 [label="Airframe Assembly" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	N17 [label="Mission Debriefing" color="#BDAFA8" fillcolor="#E4E0DF" shape=octagon style=filled]
+	N18 [label="Ground Station Coordination" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	S0 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Astronaut Training" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Propulsion Testing" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+		nest0_1 [label="Hypersonic Flight Testing" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Air Traffic Control Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="New Material Development" color="#FFDA4E" fillcolor="#FFE88D" shape=Mdiamond style=filled]
+		nest1_1 [label="Rocket Assembly" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+		nest1_2 [label="Spacecraft Telemetry Analysis" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+		nest1_3 [label="Rocket Stage Separation" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=regulates color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=controls color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [label=prototypes color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N5 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N12 -> nest1_0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [label=reports color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [label=maintains color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [label=navigates color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N0 -> S2 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [label=analyzes color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	S2 -> N16 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [label=records color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_60.txt b/test/graphviz/graph_hard/graphviz_60.txt
new file mode 100644
index 0000000000000000000000000000000000000000..85201737eff0ab66d97fde4614d1a26f3e2e54ba
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_60.txt
@@ -0,0 +1,41 @@
+<Aircraft Maintenance Log, connectedTo, Drone System Development>
+<Aircraft Maintenance Log, records, Structural Analysis>
+<Airframe Assembly, connectedTo, Mission Debriefing>
+<Avionics Installation, connectedTo, Mission Planning>
+<Component Recovery, connectedTo, System Reboot>
+<Countdown Sequence, connectedTo, Launch Execution>
+<Drone System Development, connectedTo, Satellite Configuration>
+<Drone System Development, connectedTo, Structural Analysis>
+<Extravehicular Activity Planning, connectedTo, Avionics Installation>
+<Flight Simulation, connectedTo, Structural Analysis>
+<Fueling Procedure, connectedTo, Flight Simulation>
+<Hypersonic Flight Testing, connectedTo, Avionics Installation>
+<Hypersonic Flight Testing, partOf, Hypersonic Flight Testing>
+<Launch Execution, connectedTo, Orbit Adjustment>
+<Mission Debriefing, connectedTo, Ground Station Coordination>
+<Mission Planning, connectedTo, Countdown Sequence>
+<Mission Planning, connectedTo, Structural Analysis>
+<Mission Planning, maintains, Mission Debriefing>
+<Mission Planning, navigates, System Reboot>
+<New Material Development, connectedTo, Rocket Assembly>
+<New Material Development, partOf, New Material Development>
+<Orbit Adjustment, connectedTo, Fueling Procedure>
+<Payload Integration, analyzes, Extravehicular Activity Planning>
+<Payload Integration, connectedTo, Airframe Assembly>
+<Payload Integration, connectedTo, System Reboot>
+<Payload Integration, regulates, Aircraft Maintenance Log>
+<Payload Integration, reports, Extravehicular Activity Planning>
+<Propulsion Testing, connectedTo, Hypersonic Flight Testing>
+<Propulsion Testing, partOf, Propulsion Testing>
+<Rocket Assembly, connectedTo, Spacecraft Telemetry Analysis>
+<Rocket Assembly, partOf, Rocket Assembly>
+<Rocket Stage Separation, connectedTo, Component Recovery>
+<Rocket Stage Separation, partOf, Rocket Stage Separation>
+<Satellite Configuration, controls, Extravehicular Activity Planning>
+<Satellite Configuration, prototypes, Propulsion Testing>
+<Spacecraft Telemetry Analysis, connectedTo, Rocket Stage Separation>
+<Spacecraft Telemetry Analysis, partOf, Spacecraft Telemetry Analysis>
+<Structural Analysis, connectedTo, Component Recovery>
+<Structural Analysis, connectedTo, New Material Development>
+<System Reboot, connectedTo, Thermal Shield Testing>
+<Thermal Shield Testing, connectedTo, Airframe Assembly>
diff --git a/test/graphviz/graph_hard/graphviz_61.dot b/test/graphviz/graph_hard/graphviz_61.dot
new file mode 100644
index 0000000000000000000000000000000000000000..09491031b6ac33fb96884245b269eba8f410a8cb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_61.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=LR
+	N0 [label="Customer Onboarding" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N1 [label="Broker Management" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N2 [label="Third_Party Administrator Liaison" color="#66BB6A" fillcolor="#E8F5E9" shape=octagon style=filled]
+	N3 [label="Customer Communication" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N4 [label="Payment Processing" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N5 [label=Subrogation color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N6 [label="Reinsurance Negotiation" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N7 [label=Underwriting color="#E91E63" fillcolor="#FCE4EC" shape=oval style=filled]
+	N8 [label="Claim Submission" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N9 [label="Premium Calculation" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N10 [label="Telematics Data Analysis" color="#E91E63" fillcolor="#F8BBD0" shape=parallelogram style=filled]
+	N11 [label="Benefit Payout" color="#E91E63" fillcolor="#FCE4EC" shape=plaintext style=filled]
+	N12 [label="Product Development" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N13 [label="Fraud Investigation" color="#E91E63" fillcolor="#FCE4EC" shape=Mdiamond style=filled]
+	N14 [label="Customer Support" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N15 [label="Policy Issuance" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+	N16 [label="Loss Prevention" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#66BB6A" fillcolor="#E8F5E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Legal Review of Claims" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Property Damage Assessment" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+		nest0_1 [label="Market Research" color="#E91E63" fillcolor="#F8BBD0" shape=Mdiamond style=filled]
+		nest0_2 [label="Compliance Reporting" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Healthcare Provider Network Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Claim Adjustment" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+		nest1_1 [label="Data Security" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+		nest1_2 [label="Coverage Review" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=secures color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [label=responds color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [label=distributes color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N4 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N1 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N10 -> S1 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [label=audits color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_61.txt b/test/graphviz/graph_hard/graphviz_61.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cceec756f32d877626c42a8dbfeab8829f5ffaf0
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_61.txt
@@ -0,0 +1,40 @@
+<Benefit Payout, connectedTo, Product Development>
+<Broker Management, connectedTo, Claim Submission>
+<Broker Management, connectedTo, Property Damage Assessment>
+<Broker Management, connectedTo, Third_Party Administrator Liaison>
+<Claim Adjustment, connectedTo, Data Security>
+<Claim Adjustment, partOf, Claim Adjustment>
+<Claim Submission, connectedTo, Premium Calculation>
+<Compliance Reporting, connectedTo, Payment Processing>
+<Compliance Reporting, partOf, Compliance Reporting>
+<Coverage Review, connectedTo, Broker Management>
+<Coverage Review, partOf, Coverage Review>
+<Customer Communication, connectedTo, Claim Submission>
+<Customer Communication, secures, Payment Processing>
+<Customer Onboarding, connectedTo, Broker Management>
+<Customer Onboarding, connectedTo, Claim Submission>
+<Customer Support, responds, Policy Issuance>
+<Data Security, connectedTo, Coverage Review>
+<Data Security, partOf, Data Security>
+<Fraud Investigation, connectedTo, Customer Support>
+<Market Research, connectedTo, Compliance Reporting>
+<Market Research, partOf, Market Research>
+<Payment Processing, connectedTo, Subrogation>
+<Policy Issuance, distributes, Loss Prevention>
+<Premium Calculation, connectedTo, Telematics Data Analysis>
+<Product Development, connectedTo, Fraud Investigation>
+<Property Damage Assessment, connectedTo, Market Research>
+<Property Damage Assessment, partOf, Property Damage Assessment>
+<Reinsurance Negotiation, connectedTo, Claim Adjustment>
+<Reinsurance Negotiation, connectedTo, Underwriting>
+<Subrogation, connectedTo, Claim Submission>
+<Subrogation, connectedTo, Reinsurance Negotiation>
+<Telematics Data Analysis, connectedTo, Benefit Payout>
+<Telematics Data Analysis, connectedTo, Customer Support>
+<Telematics Data Analysis, connectedTo, Fraud Investigation>
+<Telematics Data Analysis, connectedTo, Loss Prevention>
+<Telematics Data Analysis, connectedTo, Product Development>
+<Third_Party Administrator Liaison, audits, Claim Submission>
+<Third_Party Administrator Liaison, connectedTo, Claim Submission>
+<Third_Party Administrator Liaison, connectedTo, Customer Communication>
+<Underwriting, connectedTo, Claim Submission>
diff --git a/test/graphviz/graph_hard/graphviz_62.dot b/test/graphviz/graph_hard/graphviz_62.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ddad28a5a2ed8a4a97cd4debdcfc8f9b4cd8d7fc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_62.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=LR
+	N0 [label="Healthcare Provider Network Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N1 [label="Claims Litigation Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=Mdiamond style=filled]
+	N2 [label="Fraud Investigation" color="#7E57C2" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+	N3 [label="Policy Renewal" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N4 [label="Actuarial Analysis" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N5 [label="Claim Adjustment" color="#7E57C2" fillcolor="#D1C4E9" shape=octagon style=filled]
+	N6 [label="Customer Communication" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N7 [label="Data Security" color="#C2B2F0" fillcolor="#EFE6FF" shape=diamond style=filled]
+	N8 [label="Annuity Sales" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N9 [label="Life Insurance Underwriting" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N10 [label="Auto Accident Claims" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N11 [label="Premium Calculation" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	S0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Risk Assessment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Customer Onboarding" color="#C2B2F0" fillcolor="#EFE6FF" shape=octagon style=filled]
+		nest0_1 [label="Customer Support" color="#C2B2F0" fillcolor="#EFE6FF" shape=folder style=filled]
+		nest0_2 [label="Claim Submission" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Agent Training" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Investment Management for Reserves" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+		nest1_1 [label=Underwriting color="#C2B2F0" fillcolor="#EFE6FF" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=supports color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=secures color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=analyzes color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=sells color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N10 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [label=investigates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N2 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_63.txt b/test/graphviz/graph_hard/graphviz_63.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c75a8827a0f6cb026d403acf234f1c8b97ba826a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_63.txt
@@ -0,0 +1,43 @@
+<Actuarial Analysis, connectedTo, Customer Support>
+<Actuarial Analysis, connectedTo, Subrogation>
+<Annuity Sales, connectedTo, Payment Processing>
+<Annuity Sales, partOf, Annuity Sales>
+<Auto Accident Claims, connectedTo, Fraud Investigation>
+<Auto Accident Claims, partOf, Auto Accident Claims>
+<Broker Management, connectedTo, Annuity Sales>
+<Broker Management, partOf, Broker Management>
+<Catastrophe Modeling, connectedTo, Compliance Reporting>
+<Catastrophe Modeling, connectedTo, Coverage Review>
+<Claim Adjustment, connectedTo, Claims Litigation Management>
+<Claim Adjustment, connectedTo, Investment Management for Reserves>
+<Claims Litigation Management, documents, Catastrophe Modeling>
+<Compliance Reporting, connectedTo, Risk Assessment>
+<Coverage Review, connectedTo, Actuarial Analysis>
+<Coverage Review, connectedTo, Compliance Reporting>
+<Customer Support, connectedTo, Policy Issuance>
+<Customer Support, partOf, Customer Support>
+<Data Security, connectedTo, Customer Onboarding>
+<Fraud Investigation, mitigates, Compliance Reporting>
+<Fraud Investigation, partOf, Fraud Investigation>
+<Investment Management for Reserves, connectedTo, Product Development>
+<Loss Prevention, connectedTo, Claim Adjustment>
+<Loss Prevention, connectedTo, Claims Litigation Management>
+<Loss Prevention, connectedTo, Compliance Reporting>
+<Loss Prevention, connectedTo, Risk Assessment>
+<Loss Prevention, connectedTo, Subrogation>
+<Loss Prevention, supports, Investment Management for Reserves>
+<Payment Processing, connectedTo, Loss Prevention>
+<Policy Issuance, connectedTo, Broker Management>
+<Policy Issuance, partOf, Policy Issuance>
+<Policy Renewal, connectedTo, Compliance Reporting>
+<Premium Calculation, connectedTo, Investment Management for Reserves>
+<Premium Calculation, connectedTo, Payment Processing>
+<Product Development, connectedTo, Compliance Reporting>
+<Product Development, connectedTo, Customer Onboarding>
+<Product Development, connectedTo, Policy Renewal>
+<Product Development, connectedTo, Risk Assessment>
+<Product Development, connectedTo, Telematics Data Analysis>
+<Risk Assessment, connectedTo, Data Security>
+<Subrogation, connectedTo, Investment Management for Reserves>
+<Telematics Data Analysis, connectedTo, Auto Accident Claims>
+<Telematics Data Analysis, partOf, Telematics Data Analysis>
diff --git a/test/graphviz/graph_hard/graphviz_64.txt b/test/graphviz/graph_hard/graphviz_64.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1c6352a2c1df9ecad4a5d6b511b0cccc8ea8b9ad
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_64.txt
@@ -0,0 +1,43 @@
+<Antivirus Management, connectedTo, Insider Threat Detection>
+<Antivirus Management, partOf, Antivirus Management>
+<Application Security, connectedTo, Intrusion Prevention>
+<Application Security, partOf, Application Security>
+<Backup and Recovery, connectedTo, Risk Management Framework>
+<Backup and Recovery, connectedTo, Threat Detection>
+<Compliance Monitoring, connectedTo, Web Application Firewall Deployment>
+<Cryptography Implementation, connectedTo, Disaster Recovery Planning>
+<Dark Web Monitoring, connectedTo, Insider Threat Detection>
+<DevSecOps Integration, connectedTo, Network Security>
+<DevSecOps Integration, connectedTo, Security Awareness Training>
+<Digital Forensics, partOf, Digital Forensics>
+<Digital Forensics, vulnerabilities, Zero Trust Architecture>
+<Disaster Recovery Planning, connectedTo, Security Policy Development>
+<Disaster Recovery Planning, patches, Network Security>
+<Firewall Configuration, responds, Network Security>
+<Identity Management, connectedTo, Antivirus Management>
+<Identity Management, partOf, Identity Management>
+<Insider Threat Detection, connectedTo, Digital Forensics>
+<Insider Threat Detection, connectedTo, Firewall Configuration>
+<Intrusion Prevention, connectedTo, Backup and Recovery>
+<Intrusion Prevention, partOf, Intrusion Prevention>
+<Physical Security Integration, connectedTo, Application Security>
+<Physical Security Integration, partOf, Physical Security Integration>
+<Risk Management Framework, connectedTo, Compliance Monitoring>
+<Security Audit, connectedTo, Cryptography Implementation>
+<Security Audit, connectedTo, Dark Web Monitoring>
+<Security Audit, connectedTo, DevSecOps Integration>
+<Security Awareness Training, connectedTo, Dark Web Monitoring>
+<Security Awareness Training, connectedTo, Network Security>
+<Security Policy Development, connectedTo, DevSecOps Integration>
+<Security Policy Development, connectedTo, Physical Security Integration>
+<Threat Detection, connectedTo, Cryptography Implementation>
+<Threat Detection, connectedTo, Insider Threat Detection>
+<Threat Detection, connectedTo, Risk Management Framework>
+<Threat Detection, monitors, Compliance Monitoring>
+<Vulnerability Assessment, audits, Risk Management Framework>
+<Vulnerability Assessment, connectedTo, Backup and Recovery>
+<Vulnerability Assessment, connectedTo, Disaster Recovery Planning>
+<Vulnerability Assessment, connectedTo, Threat Detection>
+<Web Application Firewall Deployment, connectedTo, Security Audit>
+<Zero Trust Architecture, connectedTo, Identity Management>
+<Zero Trust Architecture, partOf, Zero Trust Architecture>
diff --git a/test/graphviz/graph_hard/graphviz_66.dot b/test/graphviz/graph_hard/graphviz_66.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4f54710e10e0eabac3fe72c657205d7d7e5eb1fc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_66.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=TD
+	N0 [label="IoT Security" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N1 [label="Compliance Monitoring" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N2 [label="Security Policy Development" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N3 [label="Physical Security Integration" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+	N4 [label="Digital Forensics" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N5 [label="Supply Chain Security" color="#8C9EFF" fillcolor="#D3D7EB" shape=oval style=filled]
+	N6 [label="Security Audit" color="#8C9EFF" fillcolor="#D3D7EB" shape=oval style=filled]
+	N7 [label="Vulnerability Assessment" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+	N8 [label="Risk Management Framework" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N9 [label="Identity Management" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+	N10 [label="DevSecOps Integration" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N11 [label="Dark Web Monitoring" color="#FFF176" fillcolor="#FFFDE7" shape=oval style=filled]
+	N12 [label="Malware Analysis" color="#FFF176" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N13 [label="Incident Response" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N14 [label="Application Security" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N15 [label="Cloud Security" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N16 [label="User Training" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S1 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Security Information and Event Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Phishing Simulation" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+		nest0_1 [label="Web Application Firewall Deployment" color="#8C9EFF" fillcolor="#D3D7EB" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Backup and Recovery" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Threat Detection" color="#FFF176" fillcolor="#FFFDE7" shape=diamond style=filled]
+		nest1_1 [label="Threat Intelligence Gathering" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+		nest1_2 [label="Firewall Configuration" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+		nest1_3 [label="Endpoint Protection" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=authorizes color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=integrates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=prevents color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N16 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest1_0 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N6 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label=complies color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N9 -> M1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N12 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [label=alerts color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_66.txt b/test/graphviz/graph_hard/graphviz_66.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c6cd53443ddf23181cea29beb22a2228019b3324
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_66.txt
@@ -0,0 +1,39 @@
+<Application Security, connectedTo, Cloud Security>
+<Cloud Security, connectedTo, User Training>
+<Compliance Monitoring, complies, DevSecOps Integration>
+<Compliance Monitoring, connectedTo, Digital Forensics>
+<Compliance Monitoring, connectedTo, Security Policy Development>
+<Dark Web Monitoring, connectedTo, Malware Analysis>
+<DevSecOps Integration, connectedTo, Dark Web Monitoring>
+<Digital Forensics, authorizes, Supply Chain Security>
+<Endpoint Protection, connectedTo, Security Audit>
+<Endpoint Protection, partOf, Endpoint Protection>
+<Firewall Configuration, connectedTo, Endpoint Protection>
+<Firewall Configuration, partOf, Firewall Configuration>
+<Identity Management, connectedTo, Malware Analysis>
+<Identity Management, prevents, DevSecOps Integration>
+<Incident Response, connectedTo, Application Security>
+<IoT Security, connectedTo, Compliance Monitoring>
+<IoT Security, connectedTo, Digital Forensics>
+<IoT Security, connectedTo, Malware Analysis>
+<IoT Security, connectedTo, Risk Management Framework>
+<Malware Analysis, connectedTo, Incident Response>
+<Malware Analysis, connectedTo, Threat Detection>
+<Phishing Simulation, connectedTo, Web Application Firewall Deployment>
+<Phishing Simulation, partOf, Phishing Simulation>
+<Physical Security Integration, connectedTo, DevSecOps Integration>
+<Physical Security Integration, connectedTo, Digital Forensics>
+<Risk Management Framework, connectedTo, Identity Management>
+<Security Audit, connectedTo, DevSecOps Integration>
+<Security Audit, connectedTo, Vulnerability Assessment>
+<Security Policy Development, alerts, Digital Forensics>
+<Security Policy Development, connectedTo, Phishing Simulation>
+<Security Policy Development, connectedTo, Physical Security Integration>
+<Supply Chain Security, integrates, Security Audit>
+<Threat Detection, connectedTo, Threat Intelligence Gathering>
+<Threat Detection, partOf, Threat Detection>
+<Threat Intelligence Gathering, connectedTo, Firewall Configuration>
+<Threat Intelligence Gathering, partOf, Threat Intelligence Gathering>
+<Vulnerability Assessment, connectedTo, Risk Management Framework>
+<Web Application Firewall Deployment, connectedTo, User Training>
+<Web Application Firewall Deployment, partOf, Web Application Firewall Deployment>
diff --git a/test/graphviz/graph_hard/graphviz_68.dot b/test/graphviz/graph_hard/graphviz_68.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c73f65e575399d6d3f5455788da5f7c65b22b7cf
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_68.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=LR
+	N0 [label="Remote Control" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N1 [label="Leak Detection" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N2 [label="Home Security System Activation" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N3 [label="Automated Vacuum Cleaning" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N4 [label="Doorbell Camera Alert" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N5 [label="Guest Access Management" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+	N6 [label="Intercom System" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N7 [label="Smoke Alarm Integration" color="#64B5F6" fillcolor="#E3F2FD" shape=parallelogram style=filled]
+	N8 [label="Sound System Integration" color="#64B5F6" fillcolor="#E3F2FD" shape=oval style=filled]
+	N9 [label="Smart Appliance Control" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N10 [label="Energy Consumption Optimization" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	S0 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Firmware Update" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Geofencing Trigger" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+		nest0_1 [label="Scene Creation" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+		nest0_2 [label="Water Heater Control" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+		nest0_3 [label="Garage Door Control" color="#64B5F6" fillcolor="#E3F2FD" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Voice Command" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Window Sensor Monitoring" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest1_1 [label="Curtain Automation" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+		nest1_2 [label="Door Lock Management" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+		nest1_3 [label="Power Outage Notification" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=monitors color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=designs color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N3 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N2 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N7 -> S0 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [label=learns color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [label=secures color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [label=conserves color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	M2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_68.txt b/test/graphviz/graph_hard/graphviz_68.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a8e811b2ecdab7633c539209fec8d719244b478f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_68.txt
@@ -0,0 +1,39 @@
+<Automated Vacuum Cleaning, connectedTo, Geofencing Trigger>
+<Automated Vacuum Cleaning, connectedTo, Sound System Integration>
+<Automated Vacuum Cleaning, connectedTo, Window Sensor Monitoring>
+<Automated Vacuum Cleaning, conserves, Smart Appliance Control>
+<Automated Vacuum Cleaning, monitors, Doorbell Camera Alert>
+<Curtain Automation, connectedTo, Door Lock Management>
+<Curtain Automation, partOf, Curtain Automation>
+<Door Lock Management, connectedTo, Power Outage Notification>
+<Door Lock Management, partOf, Door Lock Management>
+<Doorbell Camera Alert, connectedTo, Guest Access Management>
+<Doorbell Camera Alert, connectedTo, Smart Appliance Control>
+<Garage Door Control, connectedTo, Automated Vacuum Cleaning>
+<Garage Door Control, partOf, Garage Door Control>
+<Geofencing Trigger, connectedTo, Scene Creation>
+<Geofencing Trigger, partOf, Geofencing Trigger>
+<Guest Access Management, connectedTo, Intercom System>
+<Guest Access Management, connectedTo, Smoke Alarm Integration>
+<Home Security System Activation, connectedTo, Automated Vacuum Cleaning>
+<Home Security System Activation, connectedTo, Sound System Integration>
+<Intercom System, connectedTo, Smoke Alarm Integration>
+<Leak Detection, connectedTo, Home Security System Activation>
+<Power Outage Notification, connectedTo, Home Security System Activation>
+<Power Outage Notification, partOf, Power Outage Notification>
+<Remote Control, connectedTo, Intercom System>
+<Remote Control, connectedTo, Leak Detection>
+<Remote Control, connectedTo, Smoke Alarm Integration>
+<Remote Control, connectedTo, Sound System Integration>
+<Remote Control, secures, Smart Appliance Control>
+<Scene Creation, connectedTo, Water Heater Control>
+<Scene Creation, partOf, Scene Creation>
+<Smart Appliance Control, connectedTo, Energy Consumption Optimization>
+<Smoke Alarm Integration, connectedTo, Smart Appliance Control>
+<Smoke Alarm Integration, designs, Sound System Integration>
+<Smoke Alarm Integration, learns, Energy Consumption Optimization>
+<Sound System Integration, connectedTo, Smart Appliance Control>
+<Water Heater Control, connectedTo, Garage Door Control>
+<Water Heater Control, partOf, Water Heater Control>
+<Window Sensor Monitoring, connectedTo, Curtain Automation>
+<Window Sensor Monitoring, partOf, Window Sensor Monitoring>
diff --git a/test/graphviz/graph_hard/graphviz_69.txt b/test/graphviz/graph_hard/graphviz_69.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7945153061da9956ad35dd0943e3a704e53f2dad
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_69.txt
@@ -0,0 +1,29 @@
+<Air Quality Monitoring, connectedTo, Device Pairing>
+<Air Quality Monitoring, connectedTo, Geofencing Trigger>
+<Device Pairing, connectedTo, Pet Feeder Automation>
+<Emergency Service Connection, connectedTo, Air Quality Monitoring>
+<Emergency Service Connection, connectedTo, Device Pairing>
+<Geofencing Trigger, connectedTo, Water Heater Control>
+<Geofencing Trigger, partOf, Geofencing Trigger>
+<Lighting Automation, connectedTo, Personalized Comfort Settings>
+<Lighting Automation, partOf, Lighting Automation>
+<Motion Detection, connectedTo, Device Pairing>
+<Motion Detection, connectedTo, Emergency Service Connection>
+<Motion Detection, connectedTo, Pet Feeder Automation>
+<Motion Detection, warns, Personalized Comfort Settings>
+<Personalized Comfort Settings, connectedTo, Emergency Service Connection>
+<Personalized Comfort Settings, connectedTo, Window Sensor Monitoring>
+<Routine Scheduling, connectedTo, Device Pairing>
+<Routine Scheduling, partOf, Routine Scheduling>
+<Scene Creation, connectedTo, Sound System Integration>
+<Smart Mirror Functionality, connectedTo, Motion Detection>
+<Sound System Integration, connectedTo, Air Quality Monitoring>
+<Sound System Integration, connectedTo, Device Pairing>
+<Sound System Integration, connectedTo, Emergency Service Connection>
+<Sound System Integration, connectedTo, Pet Feeder Automation>
+<Sound System Integration, connectedTo, Video Surveillance>
+<Video Surveillance, connectedTo, Smart Mirror Functionality>
+<Water Heater Control, connectedTo, Routine Scheduling>
+<Water Heater Control, partOf, Water Heater Control>
+<Window Sensor Monitoring, monitors, Lighting Automation>
+<Window Sensor Monitoring, partOf, Window Sensor Monitoring>
diff --git a/test/graphviz/graph_hard/graphviz_7.dot b/test/graphviz/graph_hard/graphviz_7.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7db1fba94e371d70185e3ac8dadde85aeb4937a3
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_7.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=LR
+	N0 [label="Yield Optimization" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N1 [label="Factory Layout Planning" color="#AB47BC" fillcolor="#F3E5F5" shape=Mdiamond style=filled]
+	N2 [label=Welding color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N3 [label="Workflow Optimization" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N4 [label=Shipping color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N5 [label="Logistics Planning" color="#AB47BC" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N6 [label="Supply Chain Synchronization" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N7 [label="Quality Control" color="#4285F4" fillcolor="#D0E0F8" shape=Mdiamond style=filled]
+	N8 [label="Bills of Material Generation" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N9 [label=Serialization color="#4285F4" fillcolor="#D0E0F8" shape=octagon style=filled]
+	N10 [label="Automated Guided Vehicle Operation" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N11 [label="Recycling Process" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N12 [label="Work_in_Progress Monitoring" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N13 [label="Defect Analysis" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N14 [label="Ergonomics Assessment" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	S0 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Batch Tracking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Product Design" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+		nest0_1 [label=Inspection color="#FF9800" fillcolor="#FFE0B2" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Supplier Qualification" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Storage color="#FF9800" fillcolor="#FFE0B2" shape=plaintext style=filled]
+		nest1_1 [label="Safety Audit" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+		nest1_2 [label=Maintenance color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=transports color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N11 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N9 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_71.txt b/test/graphviz/graph_hard/graphviz_71.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0c9e60f88b30ab31447bfab0012c1f67d52c0413
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_71.txt
@@ -0,0 +1,42 @@
+<Citizen Engagement Platform, connectedTo, Public Wi_Fi Deployment>
+<Citizen Feedback Loop, connectedTo, Smart Education Initiatives>
+<Crowd Management, maintains, Intelligent Public Safety Cameras>
+<Crowd Management, partOf, Crowd Management>
+<Cybersecurity for Infrastructure, connectedTo, Waste Recycling Program>
+<Cybersecurity for Infrastructure, partOf, Cybersecurity for Infrastructure>
+<Digital Kiosk Information, connectedTo, Digital Twins of City>
+<Digital Kiosk Information, connectedTo, Water Management System>
+<Digital Twins of City, connectedTo, Smart Water Meters>
+<Digital Twins of City, connectedTo, Urban Mobility Solutions>
+<Digital Twins of City, connectedTo, Water Management System>
+<E_governance Services, connectedTo, Energy Grid Management>
+<Environmental Sensor Network, connectedTo, Smart Building Integration>
+<Green Space Management, connectedTo, Smart Lighting>
+<Green Space Management, partOf, Green Space Management>
+<Intelligent Public Safety Cameras, connectedTo, Traffic Flow Optimization>
+<Intelligent Public Safety Cameras, partOf, Intelligent Public Safety Cameras>
+<Public Wi_Fi Deployment, connectedTo, Smart Water Meters>
+<Renewable Energy Integration, connectedTo, Smart Lighting>
+<Renewable Energy Integration, connectedTo, Smart Water Meters>
+<Renewable Energy Integration, connectedTo, Water Management System>
+<Smart Building Integration, connectedTo, Citizen Engagement Platform>
+<Smart Education Initiatives, connectedTo, E_governance Services>
+<Smart Lighting, connectedTo, Citizen Engagement Platform>
+<Smart Lighting, connectedTo, Public Wi_Fi Deployment>
+<Smart Lighting, connectedTo, Smart Education Initiatives>
+<Smart Lighting, connectedTo, Smart Water Meters>
+<Smart Lighting, connectedTo, Water Management System>
+<Smart Water Meters, connectedTo, Urban Agriculture Support>
+<Sustainable Resource Management, connectedTo, Green Space Management>
+<Sustainable Resource Management, partOf, Sustainable Resource Management>
+<Traffic Flow Optimization, connectedTo, E_governance Services>
+<Traffic Flow Optimization, partOf, Traffic Flow Optimization>
+<Urban Agriculture Support, connectedTo, Citizen Feedback Loop>
+<Urban Agriculture Support, connectedTo, E_governance Services>
+<Urban Agriculture Support, connectedTo, Energy Grid Management>
+<Urban Mobility Solutions, connectedTo, Renewable Energy Integration>
+<Waste Recycling Program, connectedTo, Sustainable Resource Management>
+<Waste Recycling Program, partOf, Waste Recycling Program>
+<Water Management System, connectedTo, Crowd Management>
+<Water Management System, connectedTo, Cybersecurity for Infrastructure>
+<Water Management System, connectedTo, Environmental Sensor Network>
diff --git a/test/graphviz/graph_hard/graphviz_72.dot b/test/graphviz/graph_hard/graphviz_72.dot
new file mode 100644
index 0000000000000000000000000000000000000000..60280003c6623513cbbaddc1176b279b893c7a87
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_72.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=RL
+	N0 [label="Energy Grid Management" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N1 [label="Noise Pollution Monitoring" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N2 [label="Sustainable Resource Management" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N3 [label="Intelligent Public Safety Cameras" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N4 [label="Infrastructure Maintenance Alert" color="#FBC02D" fillcolor="#FFFDE7" shape=folder style=filled]
+	N5 [label="Public Transport Tracking" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N6 [label="Urban Mobility Solutions" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N7 [label="Smart Lighting" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N8 [label="Public Wi_Fi Deployment" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N9 [label="Smart Building Integration" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N10 [label="Smart Grid Security" color="#61CAC3" fillcolor="#C2E8E6" shape=Mdiamond style=filled]
+	N11 [label="Digital Kiosk Information" color="#6FE1D5" fillcolor="#C9EFEC" shape=Mdiamond style=filled]
+	N12 [label="Renewable Energy Integration" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N13 [label="Waste Recycling Program" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N14 [label="Citizen Engagement Platform" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N15 [label="Smart Water Meters" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Public Safety Monitoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Smart Parking" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest0_1 [label="Green Space Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+		nest0_2 [label="Air Quality Index Reporting" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Urban Agriculture Support" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Water Management System" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+		nest1_1 [label="Waste Management Optimization" color="#61CAC3" fillcolor="#C2E8E6" shape=oval style=filled]
+		nest1_2 [label="Predictive Maintenance for Utilities" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N12 -> nest0_0 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N8 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [label=manages color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N1 [label=protects color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N9 -> S1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S2 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	M0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_72.txt b/test/graphviz/graph_hard/graphviz_72.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f570b608effebbf4859c505fe766799c6e48f027
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_72.txt
@@ -0,0 +1,41 @@
+<Air Quality Index Reporting, connectedTo, Public Wi_Fi Deployment>
+<Air Quality Index Reporting, partOf, Air Quality Index Reporting>
+<Citizen Engagement Platform, connectedTo, Smart Water Meters>
+<Digital Kiosk Information, connectedTo, Renewable Energy Integration>
+<Energy Grid Management, connectedTo, Noise Pollution Monitoring>
+<Green Space Management, connectedTo, Air Quality Index Reporting>
+<Green Space Management, partOf, Green Space Management>
+<Infrastructure Maintenance Alert, connectedTo, Citizen Engagement Platform>
+<Infrastructure Maintenance Alert, connectedTo, Public Transport Tracking>
+<Intelligent Public Safety Cameras, connectedTo, Citizen Engagement Platform>
+<Intelligent Public Safety Cameras, connectedTo, Infrastructure Maintenance Alert>
+<Noise Pollution Monitoring, connectedTo, Infrastructure Maintenance Alert>
+<Noise Pollution Monitoring, connectedTo, Public Wi_Fi Deployment>
+<Noise Pollution Monitoring, connectedTo, Smart Water Meters>
+<Noise Pollution Monitoring, connectedTo, Sustainable Resource Management>
+<Predictive Maintenance for Utilities, partOf, Predictive Maintenance for Utilities>
+<Predictive Maintenance for Utilities, protects, Noise Pollution Monitoring>
+<Public Transport Tracking, connectedTo, Urban Mobility Solutions>
+<Public Transport Tracking, manages, Water Management System>
+<Public Wi_Fi Deployment, connectedTo, Smart Building Integration>
+<Renewable Energy Integration, connectedTo, Smart Parking>
+<Renewable Energy Integration, connectedTo, Waste Recycling Program>
+<Smart Building Integration, connectedTo, Citizen Engagement Platform>
+<Smart Building Integration, connectedTo, Digital Kiosk Information>
+<Smart Building Integration, connectedTo, Smart Grid Security>
+<Smart Building Integration, connectedTo, Smart Water Meters>
+<Smart Building Integration, connectedTo, Waste Recycling Program>
+<Smart Grid Security, connectedTo, Digital Kiosk Information>
+<Smart Lighting, connectedTo, Citizen Engagement Platform>
+<Smart Lighting, connectedTo, Public Wi_Fi Deployment>
+<Smart Lighting, connectedTo, Waste Recycling Program>
+<Smart Parking, connectedTo, Green Space Management>
+<Smart Parking, partOf, Smart Parking>
+<Sustainable Resource Management, connectedTo, Infrastructure Maintenance Alert>
+<Sustainable Resource Management, connectedTo, Intelligent Public Safety Cameras>
+<Urban Mobility Solutions, connectedTo, Smart Lighting>
+<Waste Management Optimization, connectedTo, Predictive Maintenance for Utilities>
+<Waste Management Optimization, partOf, Waste Management Optimization>
+<Waste Recycling Program, connectedTo, Citizen Engagement Platform>
+<Water Management System, connectedTo, Waste Management Optimization>
+<Water Management System, partOf, Water Management System>
diff --git a/test/graphviz/graph_hard/graphviz_74.txt b/test/graphviz/graph_hard/graphviz_74.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1083f0e6d785a029557c32c02fd37c7f7845fcae
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_74.txt
@@ -0,0 +1,32 @@
+<Assay Development, connectedTo, Monoclonal Antibody Production>
+<Assay Development, connectedTo, Preclinical Testing>
+<Biomanufacturing Scale_up, connectedTo, Assay Development>
+<Biomanufacturing Scale_up, partOf, Biomanufacturing Scale_up>
+<Biomarker Discovery, connectedTo, Assay Development>
+<Cell Culture, connectedTo, Biomanufacturing Scale_up>
+<Cell Culture, partOf, Cell Culture>
+<Clinical Data Interpretation, connectedTo, Clinical Trial Design>
+<Clinical Data Interpretation, screens, Biomarker Discovery>
+<Clinical Trial Design, connectedTo, Assay Development>
+<Clinical Trial Design, connectedTo, Biomarker Discovery>
+<Clinical Trial Design, connectedTo, Preclinical Testing>
+<Data Management and Analysis, applies, Preclinical Testing>
+<Data Management and Analysis, connectedTo, Drug Repurposing>
+<Data Management and Analysis, connectedTo, Quality Control>
+<Drug Repurposing, connectedTo, Gene Therapy Delivery>
+<Gene Therapy Delivery, connectedTo, Intellectual Property Protection>
+<Intellectual Property Protection, analyzes, Nanobiotechnology Application>
+<Intellectual Property Protection, connectedTo, Cell Culture>
+<Intellectual Property Protection, connectedTo, Clinical Trial Design>
+<Monoclonal Antibody Production, connectedTo, Personalized Medicine Formulation>
+<Monoclonal Antibody Production, partOf, Monoclonal Antibody Production>
+<Nanobiotechnology Application, automates, Quality Control>
+<Nanobiotechnology Application, connectedTo, Biomarker Discovery>
+<Nanobiotechnology Application, connectedTo, Clinical Trial Design>
+<Personalized Medicine Formulation, connectedTo, Tissue Engineering>
+<Personalized Medicine Formulation, partOf, Personalized Medicine Formulation>
+<Pharmacogenomics, connectedTo, Clinical Data Interpretation>
+<Quality Control, connectedTo, Biomarker Discovery>
+<Quality Control, connectedTo, Pharmacogenomics>
+<Tissue Engineering, ferments, Assay Development>
+<Tissue Engineering, partOf, Tissue Engineering>
diff --git a/test/graphviz/graph_hard/graphviz_75.dot b/test/graphviz/graph_hard/graphviz_75.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6e12f64854be042b4caf05f29ff2356a64b98ad4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_75.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=TD
+	N0 [label="Vaccine Development" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N1 [label="Biosensor Development" color="#FF9800" fillcolor="#FFE0B2" shape=folder style=filled]
+	N2 [label="Lab Automation" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N3 [label="Data Management and Analysis" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N4 [label="Microbial Fermentation" color="#FF9800" fillcolor="#FFE0B2" shape=folder style=filled]
+	N5 [label="Cell Culture" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N6 [label="Stem Cell Research" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N7 [label="Assay Development" color="#4285F4" fillcolor="#D0E0F8" shape=parallelogram style=filled]
+	N8 [label="Target Identification" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N9 [label="Synthetic Biology Design" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N10 [label="Regulatory Submission" color="#4285F4" fillcolor="#D0E0F8" shape=oval style=filled]
+	N11 [label="Environmental Bioremediation" color="#FF9800" fillcolor="#FFE0B2" shape=folder style=filled]
+	N12 [label="Nanobiotechnology Application" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	S1 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Personalized Medicine Formulation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Bioimaging color="#FF9800" fillcolor="#FFE0B2" shape=plaintext style=filled]
+		nest0_1 [label="Biomanufacturing Scale_up" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+		nest0_2 [label="Computational Biology Modeling" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Intellectual Property Protection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Clinical Trial Design" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+		nest1_1 [label="Clinical Data Interpretation" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+		nest1_2 [label="Monoclonal Antibody Production" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N8 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N3 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S1 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_75.txt b/test/graphviz/graph_hard/graphviz_75.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3cce2ae082c8988d5d6243f1931fb194522d2905
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_75.txt
@@ -0,0 +1,33 @@
+<Assay Development, connectedTo, Clinical Data Interpretation>
+<Assay Development, connectedTo, Target Identification>
+<Bioimaging, connectedTo, Biomanufacturing Scale_up>
+<Bioimaging, partOf, Bioimaging>
+<Biomanufacturing Scale_up, connectedTo, Computational Biology Modeling>
+<Biomanufacturing Scale_up, partOf, Biomanufacturing Scale_up>
+<Biosensor Development, connectedTo, Assay Development>
+<Biosensor Development, connectedTo, Lab Automation>
+<Cell Culture, connectedTo, Stem Cell Research>
+<Clinical Data Interpretation, connectedTo, Monoclonal Antibody Production>
+<Clinical Data Interpretation, partOf, Clinical Data Interpretation>
+<Clinical Trial Design, connectedTo, Clinical Data Interpretation>
+<Clinical Trial Design, partOf, Clinical Trial Design>
+<Computational Biology Modeling, connectedTo, Target Identification>
+<Computational Biology Modeling, connectedTo, Vaccine Development>
+<Computational Biology Modeling, partOf, Computational Biology Modeling>
+<Data Management and Analysis, connectedTo, Bioimaging>
+<Data Management and Analysis, connectedTo, Microbial Fermentation>
+<Environmental Bioremediation, connectedTo, Nanobiotechnology Application>
+<Lab Automation, connectedTo, Assay Development>
+<Lab Automation, connectedTo, Data Management and Analysis>
+<Microbial Fermentation, connectedTo, Cell Culture>
+<Monoclonal Antibody Production, connectedTo, Data Management and Analysis>
+<Monoclonal Antibody Production, partOf, Monoclonal Antibody Production>
+<Regulatory Submission, connectedTo, Clinical Trial Design>
+<Regulatory Submission, connectedTo, Environmental Bioremediation>
+<Stem Cell Research, connectedTo, Assay Development>
+<Synthetic Biology Design, connectedTo, Environmental Bioremediation>
+<Synthetic Biology Design, connectedTo, Nanobiotechnology Application>
+<Synthetic Biology Design, connectedTo, Regulatory Submission>
+<Target Identification, connectedTo, Synthetic Biology Design>
+<Vaccine Development, connectedTo, Assay Development>
+<Vaccine Development, connectedTo, Biosensor Development>
diff --git a/test/graphviz/graph_hard/graphviz_76.dot b/test/graphviz/graph_hard/graphviz_76.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a5661e04c60336810221cf7baa76ec8acac3bb2a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_76.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=TD
+	N0 [label="Batch Release" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N1 [label=Pharmacovigilance color="#3F51B5" fillcolor="#C5CAE9" shape=folder style=filled]
+	N2 [label="Good Manufacturing Practices" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N3 [label="Supply Chain Management" color="#3F51B5" fillcolor="#C5CAE9" shape=folder style=filled]
+	N4 [label="Drug Device Combination" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N5 [label="Process Validation" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+	N6 [label=Biostatistics color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N7 [label="Preclinical Testing" color="#3F51B5" fillcolor="#C5CAE9" shape=folder style=filled]
+	N8 [label="Compound Synthesis" color="#AF56A6" fillcolor="#DDCEDD" shape=Mdiamond style=filled]
+	N9 [label="Formulation Development" color="#3F51B5" fillcolor="#C5CAE9" shape=octagon style=filled]
+	N10 [label="Clinical Data Management" color="#FF5722" fillcolor="#FFCCBC" shape=oval style=filled]
+	N11 [label="Cleanroom Operations" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N12 [label="Patent Application" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N13 [label="Solid Dosage Formulation" color="#FF5722" fillcolor="#FFCCBC" shape=octagon style=filled]
+	N14 [label=Packaging color="#3F51B5" fillcolor="#C5CAE9" shape=folder style=filled]
+	N15 [label="Active Pharmaceutical Ingredient Production" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N16 [label="Patient Adherence Programs" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N17 [label="Cold Chain Logistics" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N18 [label="Medical Writing" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N19 [label="Sales and Marketing Strategy" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	S0 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Clinical Trial Phases" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Quality Control" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest0_1 [label="Market Access Strategy" color="#3F51B5" fillcolor="#C5CAE9" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Drug Stability Testing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Global Regulatory Affairs" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+		nest1_1 [label="Manufacturing Scale_up" color="#FF5722" fillcolor="#FFCCBC" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [label=monitors color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N18 -> N19 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest0_0 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N19 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N18 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [label=advises color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N7 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_77.dot b/test/graphviz/graph_hard/graphviz_77.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1829fab46e61cb062cafdc7829f8c1837b0ecc2d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_77.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=LR
+	N0 [label="Formulation Development" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N1 [label="Sterile Product Filling" color="#C2B2F0" fillcolor="#EFE6FF" shape=plaintext style=filled]
+	N2 [label="Global Regulatory Affairs" color="#4285F4" fillcolor="#D0E0F8" shape=plaintext style=filled]
+	N3 [label="Medical Writing" color="#4285F4" fillcolor="#D0E0F8" shape=Mdiamond style=filled]
+	N4 [label=Packaging color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N5 [label=Distribution color="#607D8B" fillcolor="#CFD8DC" shape=diamond style=filled]
+	N6 [label="Clinical Data Management" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N7 [label="Health Economics Outcomes Research" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N8 [label="Preclinical Testing" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N9 [label="Cleanroom Operations" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N10 [label="Quality Control" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N11 [label="Active Pharmaceutical Ingredient Production" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	S0 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Drug Device Combination" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Audit Management" color="#607D8B" fillcolor="#CFD8DC" shape=plaintext style=filled]
+		nest0_1 [label="Intellectual Property Litigation" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+		nest0_2 [label="Regulatory Approval" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+		nest0_3 [label="Clinical Trial Phases" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Adverse Event Reporting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Manufacturing Scale_up" color="#4285F4" fillcolor="#D0E0F8" shape=Mdiamond style=filled]
+		nest1_1 [label="Drug Stability Testing" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [label=advises color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=synthesizes color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N8 [label=secures color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [label=evaluates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M2 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N8 -> M2 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N10 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_78.dot b/test/graphviz/graph_hard/graphviz_78.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3941a441c96a906649f40e5259a14c531ef157be
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_78.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=BT
+	N0 [label="Clinical Supply Management" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N1 [label="Intellectual Property Litigation" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N2 [label=Pharmacovigilance color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N3 [label=Packaging color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N4 [label="Manufacturing Scale_up" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N5 [label="Process Validation" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N6 [label="Sterile Product Filling" color="#FFE470" fillcolor="#FFFAE0" shape=Mdiamond style=filled]
+	N7 [label="Active Pharmaceutical Ingredient Production" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N8 [label="Formulation Development" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Preclinical Testing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Supply Chain Management" color="#FFF176" fillcolor="#FFFDE7" shape=diamond style=filled]
+		nest0_1 [label="Batch Release" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest0_2 [label="Injectable Drug Manufacturing" color="#F7BEE0" fillcolor="#FAEBF3" shape=oval style=filled]
+		nest0_3 [label="Clinical Trial Phases" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Counterfeit Drug Detection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Clinical Data Management" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest1_1 [label="Medical Writing" color="#F7BEE0" fillcolor="#FAEBF3" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=sells color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [label=synthesizes color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N4 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label=researches color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N6 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_78.txt b/test/graphviz/graph_hard/graphviz_78.txt
new file mode 100644
index 0000000000000000000000000000000000000000..63af9ef647de1f7bd5c160c9211e7759add22c94
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_78.txt
@@ -0,0 +1,34 @@
+<Active Pharmaceutical Ingredient Production, connectedTo, Formulation Development>
+<Batch Release, connectedTo, Injectable Drug Manufacturing>
+<Batch Release, partOf, Batch Release>
+<Clinical Data Management, connectedTo, Medical Writing>
+<Clinical Data Management, partOf, Clinical Data Management>
+<Clinical Supply Management, connectedTo, Intellectual Property Litigation>
+<Clinical Supply Management, connectedTo, Manufacturing Scale_up>
+<Clinical Supply Management, researches, Manufacturing Scale_up>
+<Clinical Trial Phases, connectedTo, Intellectual Property Litigation>
+<Clinical Trial Phases, partOf, Clinical Trial Phases>
+<Injectable Drug Manufacturing, connectedTo, Clinical Trial Phases>
+<Injectable Drug Manufacturing, partOf, Injectable Drug Manufacturing>
+<Intellectual Property Litigation, connectedTo, Manufacturing Scale_up>
+<Intellectual Property Litigation, connectedTo, Pharmacovigilance>
+<Intellectual Property Litigation, connectedTo, Sterile Product Filling>
+<Intellectual Property Litigation, synthesizes, Active Pharmaceutical Ingredient Production>
+<Manufacturing Scale_up, connectedTo, Active Pharmaceutical Ingredient Production>
+<Manufacturing Scale_up, connectedTo, Formulation Development>
+<Manufacturing Scale_up, connectedTo, Process Validation>
+<Manufacturing Scale_up, connectedTo, Sterile Product Filling>
+<Medical Writing, connectedTo, Manufacturing Scale_up>
+<Medical Writing, partOf, Medical Writing>
+<Packaging, connectedTo, Clinical Data Management>
+<Packaging, connectedTo, Sterile Product Filling>
+<Packaging, sells, Manufacturing Scale_up>
+<Pharmacovigilance, connectedTo, Formulation Development>
+<Pharmacovigilance, connectedTo, Manufacturing Scale_up>
+<Pharmacovigilance, connectedTo, Packaging>
+<Pharmacovigilance, connectedTo, Sterile Product Filling>
+<Process Validation, connectedTo, Sterile Product Filling>
+<Sterile Product Filling, connectedTo, Active Pharmaceutical Ingredient Production>
+<Sterile Product Filling, connectedTo, Supply Chain Management>
+<Supply Chain Management, connectedTo, Batch Release>
+<Supply Chain Management, partOf, Supply Chain Management>
diff --git a/test/graphviz/graph_hard/graphviz_79.dot b/test/graphviz/graph_hard/graphviz_79.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b0322b196893e972a877786e175841f5b245642e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_79.dot
@@ -0,0 +1,88 @@
+digraph {
+	rankdir=TD
+	N0 [label="Kinematics and Dynamics" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Robot Fleet Management" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N2 [label="Artificial Intelligence Integration" color="#EAEFA5" fillcolor="#FDFCEB" shape=Mdiamond style=filled]
+	N3 [label="Robotics Simulation" color="#DCE775" fillcolor="#F9FBE7" shape=plaintext style=filled]
+	N4 [label="Exploration Robotics" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N5 [label="Field Deployment" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N6 [label="Actuator Control" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N7 [label="Wireless Communication" color="#DCE775" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+	N8 [label="Exoskeleton Development" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N9 [label="Robot Assembly" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N10 [label="Sensor Integration" color="#DCE775" fillcolor="#F9FBE7" shape=oval style=filled]
+	N11 [label="Robot Design" color="#EAEFA5" fillcolor="#FDFCEB" shape=parallelogram style=filled]
+	N12 [label="Data Collection" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N13 [label="End_Effector Design" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+	N14 [label="Collaborative Robotics" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N15 [label="Medical Robotics" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	S0 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Machine Vision" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Path Planning" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_1 [label=Calibration color="#DCE775" fillcolor="#F9FBE7" shape=folder style=filled]
+		nest0_2 [label="Grasping and Manipulation" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+		nest0_3 [label=Maintenance color="#EAEFA5" fillcolor="#FDFCEB" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Safety System Implementation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Fault Detection and Diagnosis" color="#B8C0F5" fillcolor="#ECF0FD" shape=plaintext style=filled]
+		nest1_1 [label="Agricultural Robotics" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+		nest1_2 [label="Learning Algorithms" color="#EAEFA5" fillcolor="#FDFCEB" shape=parallelogram style=filled]
+		nest1_3 [label="Drone Control" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=automates color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=builds color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [label=moves color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N11 [label=tests color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N9 [label=calibrates color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [label=secures color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [label=avoids color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S2 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	S2 -> N15 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label=applies color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N4 -> M2 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N8 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_8.dot b/test/graphviz/graph_hard/graphviz_8.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cdde44c9da1a27286267a081e54870ce24c473a8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_8.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=BT
+	N0 [label=Painting color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N1 [label="Tool Setup" color="#FFD54F" fillcolor="#FFF8E1" shape=octagon style=filled]
+	N2 [label=Inspection color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N3 [label="Supply Chain Synchronization" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N4 [label="Batch Tracking" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N5 [label="Work_in_Progress Monitoring" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N6 [label="Machine Calibration" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N7 [label="Workflow Optimization" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N8 [label=Packaging color="#FFD54F" fillcolor="#FFF8E1" shape=diamond style=filled]
+	N9 [label="Product Design" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	S0 [label="" color="#F06292" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Final Testing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Safety Audit" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+		nest0_1 [label="Tool Path Generation" color="#FFD54F" fillcolor="#FFF8E1" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label=Shipping labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Logistics Planning" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+		nest1_1 [label="Recycling Process" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+		nest1_2 [label="Component Sourcing" color="#F06292" fillcolor="#FCE4EC" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N1 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [label=repairs color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S2 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label=optimizes color="#F06292" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_82.txt b/test/graphviz/graph_hard/graphviz_82.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5aabba6ea79375cddf8c63be4dd66e273918f9ee
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_82.txt
@@ -0,0 +1,43 @@
+<Blueprint Review, connectedTo, Punch List Completion>
+<Bridge Building, connectedTo, Blueprint Review>
+<Bridge Building, connectedTo, Punch List Completion>
+<Bridge Building, connectedTo, Road Construction>
+<Bridge Building, connectedTo, Subcontractor Management>
+<Budget Tracking, connectedTo, Blueprint Review>
+<Budget Tracking, connectedTo, Bridge Building>
+<Demolition, connectedTo, Budget Tracking>
+<Excavation, connectedTo, Robotics in Construction>
+<Excavation, partOf, Excavation>
+<Facade Installation, connectedTo, Landscape Design>
+<Facade Installation, partOf, Facade Installation>
+<Foundation Laying, connectedTo, Blueprint Review>
+<Foundation Laying, demolishes, Plumbing Work>
+<Landscape Design, connectedTo, Subcontractor Management>
+<Landscape Design, partOf, Landscape Design>
+<Material Procurement, connectedTo, Sustainable Building Design>
+<Plumbing Work, connectedTo, Demolition>
+<Pre_fabrication, connectedTo, Blueprint Review>
+<Pre_fabrication, partOf, Pre_fabrication>
+<Project Scheduling, connectedTo, Demolition>
+<Project Scheduling, connectedTo, Foundation Laying>
+<Project Scheduling, connectedTo, Steel Erection>
+<Project Scheduling, connectedTo, Subcontractor Management>
+<Punch List Completion, connectedTo, Subcontractor Management>
+<Quality Assurance, connectedTo, Excavation>
+<Quality Assurance, partOf, Quality Assurance>
+<Risk Assessment, connectedTo, Foundation Laying>
+<Risk Assessment, manages, Waste Management>
+<Road Construction, audits, Blueprint Review>
+<Robotics in Construction, connectedTo, Pre_fabrication>
+<Robotics in Construction, partOf, Robotics in Construction>
+<Safety Inspection, connectedTo, Equipment Mobilization>
+<Safety Inspection, connectedTo, Material Procurement>
+<Safety Inspection, connectedTo, Sustainable Building Design>
+<Steel Erection, advises, Foundation Laying>
+<Subcontractor Management, connectedTo, Facade Installation>
+<Subcontractor Management, connectedTo, Safety Inspection>
+<Sustainable Building Design, materials, Equipment Mobilization>
+<Waste Management, connectedTo, Demolition>
+<Waste Management, connectedTo, Foundation Laying>
+<Waste Management, connectedTo, Project Scheduling>
+<Waste Management, connectedTo, Quality Assurance>
diff --git a/test/graphviz/graph_hard/graphviz_83.dot b/test/graphviz/graph_hard/graphviz_83.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d332362c4f14d0356d0850e33eecf915a07c905c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_83.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=TD
+	N0 [label="Foundation Laying" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N1 [label="Punch List Completion" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N2 [label="Safety Inspection" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+	N3 [label="Budget Tracking" color="#FFE69C" fillcolor="#FFF9D4" shape=Mdiamond style=filled]
+	N4 [label="Waste Management" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N5 [label="Project Scheduling" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N6 [label="Site Planning" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N7 [label="Site Decontamination" color="#A188D0" fillcolor="#DACBE3" shape=oval style=filled]
+	N8 [label="Bridge Building" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N9 [label="Interior Finishing" color="#FFE69C" fillcolor="#FFF9D4" shape=diamond style=filled]
+	N10 [label="Concrete Pouring" color="#FFC107" fillcolor="#FFECB3" shape=Mdiamond style=filled]
+	N11 [label="Sustainable Building Design" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N12 [label="Robotics in Construction" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N13 [label="Risk Assessment" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	S0 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Site Logistics" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Change Order Management" color="#FFE69C" fillcolor="#FFF9D4" shape=folder style=filled]
+		nest0_1 [label="Utility Connection" color="#FFC107" fillcolor="#FFECB3" shape=oval style=filled]
+		nest0_2 [label="Permit Application" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+		nest0_3 [label="HVAC Installation" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Landscape Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Demolition color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+		nest1_1 [label="Drone Surveying" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest1_2 [label=Excavation color="#A188D0" fillcolor="#DACBE3" shape=octagon style=filled]
+		nest1_3 [label="Equipment Mobilization" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=plans color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=grades color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=constructs color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N9 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest1_0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N2 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_84.dot b/test/graphviz/graph_hard/graphviz_84.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3383fc991026d8599d5ae2cd623b9e1ee93f3a1d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_84.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=LR
+	N0 [label="Roofing Installation" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Post_Construction Handover" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N2 [label="Waste Management" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N3 [label="Bridge Building" color="#F06292" fillcolor="#FCE4EC" shape=Mdiamond style=filled]
+	N4 [label="Permit Application" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N5 [label="Foundation Laying" color="#FFB74D" fillcolor="#FFF3E0" shape=octagon style=filled]
+	N6 [label="Subcontractor Management" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N7 [label="Equipment Mobilization" color="#4DB6AC" fillcolor="#E0F2F1" shape=plaintext style=filled]
+	N8 [label="Risk Assessment" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S1 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Structural Framing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Safety Inspection" color="#FFB74D" fillcolor="#FFF3E0" shape=parallelogram style=filled]
+		nest0_1 [label="Site Planning" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+		nest0_2 [label="Quality Assurance" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+		nest0_3 [label=Demolition color="#F06292" fillcolor="#FCE4EC" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Interior Finishing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Road Construction" color="#4DB6AC" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+		nest1_1 [label="Occupancy Permit Acquisition" color="#FFB74D" fillcolor="#FFF3E0" shape=folder style=filled]
+		nest1_2 [label="Site Decontamination" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=reports color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N8 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N5 -> S2 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_86.dot b/test/graphviz/graph_hard/graphviz_86.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0b2681eb4b66469c3069d0f0a5bdf986121af6ff
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_86.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=RL
+	N0 [label="Analytics Reporting" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N1 [label=Scriptwriting color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N2 [label="Visual Effects" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N3 [label="Augmented Reality Experiences" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N4 [label="Cross_Platform Syndication" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+	N5 [label="Music Recording" color="#5C6BC0" fillcolor="#E8EAF6" shape=plaintext style=filled]
+	N6 [label="Sound Design" color="#5C6BC0" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	N7 [label="Event Organization" color="#C0CA33" fillcolor="#F9FBE7" shape=oval style=filled]
+	N8 [label="Audience Engagement" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N9 [label="Public Relations" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N10 [label="Content Licensing" color="#5C6BC0" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N11 [label="Radio Programming" color="#F44336" fillcolor="#FFCDD2" shape=plaintext style=filled]
+	N12 [label="Virtual Reality Content Creation" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	S0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label=Photojournalism labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Digital Marketing" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest0_1 [label="Content Creation" color="#F44336" fillcolor="#FFCDD2" shape=parallelogram style=filled]
+		nest0_2 [label="Audience Segmentation" color="#5C6BC0" fillcolor="#E8EAF6" shape=folder style=filled]
+		nest0_3 [label="Subscription Management" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Game Streaming" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="User Generated Content Curation" color="#5C6BC0" fillcolor="#E8EAF6" shape=plaintext style=filled]
+		nest1_1 [label="Film Production" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=develops color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [label=broadcasts color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N7 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_86.txt b/test/graphviz/graph_hard/graphviz_86.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8259284cd5cad4eadb8413a95256c0405066d319
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_86.txt
@@ -0,0 +1,35 @@
+<Analytics Reporting, connectedTo, Augmented Reality Experiences>
+<Analytics Reporting, connectedTo, Cross_Platform Syndication>
+<Analytics Reporting, develops, Scriptwriting>
+<Audience Engagement, connectedTo, Public Relations>
+<Audience Segmentation, connectedTo, Subscription Management>
+<Audience Segmentation, partOf, Audience Segmentation>
+<Augmented Reality Experiences, connectedTo, Cross_Platform Syndication>
+<Content Creation, connectedTo, Audience Segmentation>
+<Content Creation, partOf, Content Creation>
+<Content Licensing, connectedTo, Radio Programming>
+<Cross_Platform Syndication, connectedTo, Music Recording>
+<Digital Marketing, connectedTo, Content Creation>
+<Digital Marketing, partOf, Digital Marketing>
+<Event Organization, broadcasts, Digital Marketing>
+<Event Organization, connectedTo, Audience Engagement>
+<Event Organization, connectedTo, Public Relations>
+<Event Organization, connectedTo, Radio Programming>
+<Film Production, connectedTo, Scriptwriting>
+<Film Production, partOf, Film Production>
+<Music Recording, connectedTo, Sound Design>
+<Public Relations, connectedTo, Content Licensing>
+<Radio Programming, connectedTo, Virtual Reality Content Creation>
+<Scriptwriting, connectedTo, Augmented Reality Experiences>
+<Scriptwriting, connectedTo, Cross_Platform Syndication>
+<Scriptwriting, connectedTo, Event Organization>
+<Scriptwriting, connectedTo, Public Relations>
+<Scriptwriting, connectedTo, Visual Effects>
+<Sound Design, connectedTo, Event Organization>
+<Subscription Management, connectedTo, Cross_Platform Syndication>
+<Subscription Management, partOf, Subscription Management>
+<User Generated Content Curation, connectedTo, Film Production>
+<User Generated Content Curation, partOf, User Generated Content Curation>
+<Visual Effects, connectedTo, Augmented Reality Experiences>
+<Visual Effects, connectedTo, Cross_Platform Syndication>
+<Visual Effects, connectedTo, User Generated Content Curation>
diff --git a/test/graphviz/graph_hard/graphviz_89.txt b/test/graphviz/graph_hard/graphviz_89.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5418e86c5a91987a7584cb7155d176d796b2fd55
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_89.txt
@@ -0,0 +1,29 @@
+<Baking, connectedTo, Recipe Development>
+<Baking, partOf, Baking>
+<Brewing, connectedTo, Food Waste Management System>
+<Catering Operations, connectedTo, Delivery Service Coordination>
+<Catering Operations, connectedTo, Waste Reduction>
+<Catering Operations, partOf, Catering Operations>
+<Customer Order Taking, connectedTo, Dietary Requirement Accommodation>
+<Customer Order Taking, connectedTo, Ingredient Traceability>
+<Customer Order Taking, connectedTo, Inventory Management>
+<Customer Order Taking, connectedTo, Regulatory Compliance>
+<Delivery Service Coordination, connectedTo, Inventory Management>
+<Delivery Service Coordination, partOf, Delivery Service Coordination>
+<Food Waste Management System, connectedTo, Customer Order Taking>
+<Food Waste Management System, connectedTo, Dietary Requirement Accommodation>
+<Food Waste Management System, connectedTo, Inventory Management>
+<Food Waste Management System, connectedTo, Waste Reduction>
+<Ingredient Traceability, connectedTo, Catering Operations>
+<Ingredient Traceability, partOf, Ingredient Traceability>
+<Inventory Management, connectedTo, Dietary Requirement Accommodation>
+<Quality Control, connectedTo, Baking>
+<Quality Control, partOf, Quality Control>
+<Recipe Development, connectedTo, Brewing>
+<Recipe Development, partOf, Recipe Development>
+<Regulatory Compliance, distributes, Supplier Management>
+<Regulatory Compliance, preserves, Inventory Management>
+<Restaurant Reservation System, connectedTo, Brewing>
+<Supplier Management, connectedTo, Quality Control>
+<Supplier Management, partOf, Supplier Management>
+<Waste Reduction, connectedTo, Customer Order Taking>
diff --git a/test/graphviz/graph_hard/graphviz_9.dot b/test/graphviz/graph_hard/graphviz_9.dot
new file mode 100644
index 0000000000000000000000000000000000000000..99db99edfb95640679b1cfd73180243e519ea84a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_9.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=LR
+	N0 [label=Inspection color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label=Storage color="#CB9BE1" fillcolor="#F2E6F5" shape=Mdiamond style=filled]
+	N2 [label="Workflow Optimization" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N3 [label="Bills of Material Generation" color="#CFCFCF" fillcolor="#F6F6F6" shape=oval style=filled]
+	N4 [label=Packaging color="#CFCFCF" fillcolor="#F6F6F6" shape=oval style=filled]
+	N5 [label=Serialization color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N6 [label="Factory Layout Planning" color="#CFCFCF" fillcolor="#F6F6F6" shape=plaintext style=filled]
+	N7 [label="Robotics Integration" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+	N8 [label="Tool Path Generation" color="#DCE775" fillcolor="#F9FBE7" shape=oval style=filled]
+	N9 [label=Assembly color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N10 [label="Machine Calibration" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	S0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Safety Audit" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Predictive Maintenance" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+		nest0_1 [label=Painting color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_2 [label="Production Scheduling" color="#DCE775" fillcolor="#F9FBE7" shape=folder style=filled]
+		nest0_3 [label="Quality Control" color="#CB9BE1" fillcolor="#F2E6F5" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Raw Material" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Final Testing" color="#DCE775" fillcolor="#F9FBE7" shape=octagon style=filled]
+		nest1_1 [label="Automated Guided Vehicle Operation" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+		nest1_2 [label="Automated Assembly" color="#CB9BE1" fillcolor="#F2E6F5" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [label=receives color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S2 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N6 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_9.txt b/test/graphviz/graph_hard/graphviz_9.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1050093c0f9b228b1f3c51a4d90c7f701446fdfc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_9.txt
@@ -0,0 +1,38 @@
+<Assembly, connectedTo, Machine Calibration>
+<Automated Assembly, connectedTo, Packaging>
+<Automated Assembly, partOf, Automated Assembly>
+<Automated Guided Vehicle Operation, connectedTo, Automated Assembly>
+<Automated Guided Vehicle Operation, partOf, Automated Guided Vehicle Operation>
+<Bills of Material Generation, connectedTo, Assembly>
+<Bills of Material Generation, connectedTo, Factory Layout Planning>
+<Bills of Material Generation, connectedTo, Machine Calibration>
+<Bills of Material Generation, connectedTo, Packaging>
+<Bills of Material Generation, connectedTo, Robotics Integration>
+<Bills of Material Generation, connectedTo, Tool Path Generation>
+<Factory Layout Planning, connectedTo, Robotics Integration>
+<Final Testing, connectedTo, Automated Guided Vehicle Operation>
+<Final Testing, partOf, Final Testing>
+<Inspection, connectedTo, Packaging>
+<Inspection, connectedTo, Storage>
+<Packaging, connectedTo, Predictive Maintenance>
+<Packaging, connectedTo, Serialization>
+<Painting, connectedTo, Production Scheduling>
+<Painting, partOf, Painting>
+<Predictive Maintenance, connectedTo, Painting>
+<Predictive Maintenance, partOf, Predictive Maintenance>
+<Production Scheduling, connectedTo, Quality Control>
+<Production Scheduling, partOf, Production Scheduling>
+<Quality Control, connectedTo, Factory Layout Planning>
+<Quality Control, partOf, Quality Control>
+<Robotics Integration, connectedTo, Tool Path Generation>
+<Serialization, connectedTo, Assembly>
+<Serialization, connectedTo, Factory Layout Planning>
+<Serialization, connectedTo, Robotics Integration>
+<Serialization, connectedTo, Tool Path Generation>
+<Serialization, receives, Machine Calibration>
+<Storage, connectedTo, Final Testing>
+<Storage, connectedTo, Packaging>
+<Storage, connectedTo, Workflow Optimization>
+<Tool Path Generation, connectedTo, Assembly>
+<Workflow Optimization, connectedTo, Bills of Material Generation>
+<Workflow Optimization, connectedTo, Packaging>
diff --git a/test/graphviz/graph_hard/graphviz_90.dot b/test/graphviz/graph_hard/graphviz_90.dot
new file mode 100644
index 0000000000000000000000000000000000000000..bc4d38ab743e76ed04a6f028eb5c6386e6e8f501
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_90.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=LR
+	N0 [label="Consumer Feedback Collection" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N1 [label=Cooking color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N2 [label="Restaurant Reservation System" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N3 [label="Customer Order Taking" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N4 [label="Cuisine Innovation" color="#80DDEA" fillcolor="#D3F7F9" shape=Mdiamond style=filled]
+	N5 [label="Kitchen Hygiene" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N6 [label="Service Delivery" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N7 [label="Food Waste Management System" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N8 [label=Brewing color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+	N9 [label="New Product Launch" color="#80DDEA" fillcolor="#D3F7F9" shape=folder style=filled]
+	N10 [label="Food Packaging Design" color="#FF5722" fillcolor="#FFCCBC" shape=octagon style=filled]
+	N11 [label="Quality Control" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+	N12 [label="Sensory Evaluation" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N13 [label="Food Safety Inspection" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+	N14 [label="Branding and Marketing" color="#80DDEA" fillcolor="#D3F7F9" shape=plaintext style=filled]
+	N15 [label="Storage Solutions" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	S0 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Food Preparation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Ingredient Sourcing" color="#80DDEA" fillcolor="#D3F7F9" shape=parallelogram style=filled]
+		nest0_1 [label="Dietary Requirement Accommodation" color="#BDBDBD" fillcolor="#F5F5F5" shape=diamond style=filled]
+		nest0_2 [label="Menu Planning" color="#FF5722" fillcolor="#FFCCBC" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Waste Reduction" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Beverage Production" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+		nest1_1 [label="Food Preservation" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+		nest1_2 [label=Baking color="#BDBDBD" fillcolor="#F5F5F5" shape=parallelogram style=filled]
+		nest1_3 [label="Sustainable Sourcing" color="#80DDEA" fillcolor="#D3F7F9" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=grows color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=nutrifies color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N14 -> nest0_0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N15 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest1_0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N8 -> M2 [label=freezes color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_92.txt b/test/graphviz/graph_hard/graphviz_92.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2644250c7f4053acce47771b67574c70b2cd3dab
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_92.txt
@@ -0,0 +1,40 @@
+<Athlete Brand Management, connectedTo, Player Transfer>
+<Athlete Brand Management, partOf, Athlete Brand Management>
+<Athlete Nutrition Planning, connectedTo, Fan Club Management>
+<Athlete Performance Tracking, connectedTo, Accessibility in Sports Venues>
+<Coaching, connectedTo, Venue Booking>
+<Coaching, partOf, Coaching>
+<Data Analytics in Sports, connectedTo, Athlete Nutrition Planning>
+<Data Analytics in Sports, connectedTo, Athlete Performance Tracking>
+<Data Analytics in Sports, connectedTo, Sports Betting Regulation>
+<Esports Event Management, connectedTo, Athlete Performance Tracking>
+<Esports Event Management, connectedTo, Scorekeeping>
+<Esports Event Management, sponsors, Accessibility in Sports Venues>
+<Fan Club Management, connectedTo, Accessibility in Sports Venues>
+<Fan Club Management, connectedTo, Sports Betting Regulation>
+<Fan Club Management, connectedTo, Tournament Organization>
+<Fan Club Management, optimizes, Game Strategy>
+<Fan Club Management, recruits, Athlete Performance Tracking>
+<Fan Club Management, tests, Team Management>
+<Fan Engagement, connectedTo, Accessibility in Sports Venues>
+<Fan Engagement, partOf, Fan Engagement>
+<Game Strategy, connectedTo, Sponsorship Management>
+<League Management, connectedTo, Athlete Brand Management>
+<League Management, partOf, League Management>
+<Media Rights Negotiation, connectedTo, Sports Betting Regulation>
+<Media Rights Negotiation, streams, Coaching>
+<Player Transfer, connectedTo, Fan Engagement>
+<Player Transfer, partOf, Player Transfer>
+<Rule Enforcement, scores, Game Strategy>
+<Scorekeeping, connectedTo, Athlete Performance Tracking>
+<Sponsorship Management, connectedTo, Esports Event Management>
+<Sponsorship Management, medicates, Athlete Performance Tracking>
+<Sports Betting Regulation, connectedTo, Rule Enforcement>
+<Stadium Operations, connectedTo, Athlete Performance Tracking>
+<Stadium Operations, partOf, Stadium Operations>
+<Team Management, connectedTo, Sports Betting Regulation>
+<Team Management, connectedTo, Tournament Organization>
+<Tournament Organization, connectedTo, League Management>
+<Tournament Organization, connectedTo, Media Rights Negotiation>
+<Venue Booking, connectedTo, Stadium Operations>
+<Venue Booking, partOf, Venue Booking>
diff --git a/test/graphviz/graph_hard/graphviz_93.dot b/test/graphviz/graph_hard/graphviz_93.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c76f26fc02c2ba0e63fe928805d4d6425e48f64f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_93.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=TD
+	N0 [label="Sports Medicine" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N1 [label="Sports Analytics" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N2 [label=Refereeing color="#A1887F" fillcolor="#EFEBE9" shape=diamond style=filled]
+	N3 [label="Fan Experience Enhancement" color="#BDBDBD" fillcolor="#F5F5F5" shape=oval style=filled]
+	N4 [label="Athlete Performance Tracking" color="#BDBDBD" fillcolor="#F5F5F5" shape=folder style=filled]
+	N5 [label="Talent Scouting" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N6 [label="League Management" color="#BDBDBD" fillcolor="#F5F5F5" shape=parallelogram style=filled]
+	N7 [label=Coaching color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N8 [label="Sports Marketing" color="#A1887F" fillcolor="#EFEBE9" shape=folder style=filled]
+	N9 [label="Player Transfer" color="#BDBDBD" fillcolor="#F5F5F5" shape=diamond style=filled]
+	N10 [label="Fitness Conditioning" color="#BDBDBD" fillcolor="#F5F5F5" shape=Mdiamond style=filled]
+	N11 [label="Merchandise Sales" color="#A1887F" fillcolor="#EFEBE9" shape=octagon style=filled]
+	N12 [label="Stadium Operations" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N13 [label="Athlete Brand Management" color="#BDBDBD" fillcolor="#F5F5F5" shape=folder style=filled]
+	N14 [label="Sports Betting Regulation" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N15 [label="Media Rights Negotiation" color="#9FA9E1" fillcolor="#D6D9F0" shape=octagon style=filled]
+	N16 [label="Sports Psychology" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N17 [label="Injury Management" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N18 [label="Training Session" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Esports Event Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Accessibility in Sports Venues" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+		nest0_1 [label="Data Analytics in Sports" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+		nest0_2 [label="Venue Booking" color="#A1887F" fillcolor="#EFEBE9" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Match Play" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Athlete Nutrition Planning" color="#9FA9E1" fillcolor="#D6D9F0" shape=plaintext style=filled]
+		nest1_1 [label="Player Recruitment" color="#9FA9E1" fillcolor="#D6D9F0" shape=octagon style=filled]
+		nest1_2 [label="Event Broadcasting" color="#BDBDBD" fillcolor="#F5F5F5" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=licenses color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N10 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S0 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N17 [label=maintains color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S1 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N11 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N6 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_93.txt b/test/graphviz/graph_hard/graphviz_93.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ef1a1f82a15160715259967eb40b40866f80467d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_93.txt
@@ -0,0 +1,46 @@
+<Accessibility in Sports Venues, connectedTo, Data Analytics in Sports>
+<Accessibility in Sports Venues, partOf, Accessibility in Sports Venues>
+<Athlete Brand Management, connectedTo, Injury Management>
+<Athlete Brand Management, connectedTo, Media Rights Negotiation>
+<Athlete Brand Management, connectedTo, Sports Betting Regulation>
+<Athlete Brand Management, connectedTo, Sports Psychology>
+<Athlete Brand Management, connectedTo, Training Session>
+<Athlete Nutrition Planning, connectedTo, Player Recruitment>
+<Athlete Nutrition Planning, partOf, Athlete Nutrition Planning>
+<Athlete Performance Tracking, connectedTo, Accessibility in Sports Venues>
+<Athlete Performance Tracking, connectedTo, Merchandise Sales>
+<Athlete Performance Tracking, connectedTo, Talent Scouting>
+<Coaching, connectedTo, Merchandise Sales>
+<Coaching, connectedTo, Sports Marketing>
+<Data Analytics in Sports, connectedTo, Venue Booking>
+<Data Analytics in Sports, partOf, Data Analytics in Sports>
+<Event Broadcasting, connectedTo, Sports Psychology>
+<Event Broadcasting, partOf, Event Broadcasting>
+<Fan Experience Enhancement, connectedTo, Athlete Performance Tracking>
+<Fan Experience Enhancement, connectedTo, League Management>
+<Fan Experience Enhancement, connectedTo, Merchandise Sales>
+<Fitness Conditioning, connectedTo, Athlete Nutrition Planning>
+<Fitness Conditioning, connectedTo, Merchandise Sales>
+<Injury Management, connectedTo, Training Session>
+<League Management, connectedTo, Coaching>
+<League Management, connectedTo, Merchandise Sales>
+<Media Rights Negotiation, connectedTo, Sports Psychology>
+<Merchandise Sales, connectedTo, Stadium Operations>
+<Player Recruitment, connectedTo, Event Broadcasting>
+<Player Recruitment, partOf, Player Recruitment>
+<Player Transfer, connectedTo, Fitness Conditioning>
+<Refereeing, connectedTo, League Management>
+<Refereeing, licenses, Fan Experience Enhancement>
+<Sports Analytics, connectedTo, Refereeing>
+<Sports Betting Regulation, connectedTo, Media Rights Negotiation>
+<Sports Marketing, connectedTo, Player Transfer>
+<Sports Medicine, connectedTo, Sports Analytics>
+<Sports Psychology, connectedTo, Injury Management>
+<Stadium Operations, connectedTo, Athlete Brand Management>
+<Stadium Operations, connectedTo, Media Rights Negotiation>
+<Stadium Operations, connectedTo, Sports Betting Regulation>
+<Stadium Operations, connectedTo, Sports Psychology>
+<Stadium Operations, maintains, Injury Management>
+<Talent Scouting, connectedTo, League Management>
+<Venue Booking, connectedTo, Fitness Conditioning>
+<Venue Booking, partOf, Venue Booking>
diff --git a/test/graphviz/graph_hard/graphviz_94.dot b/test/graphviz/graph_hard/graphviz_94.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6240b2dddf96a96e767d826e06f18942cbc28358
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_94.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=TD
+	N0 [label="Sustainable Fashion Practices" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N1 [label="Quality Check" color="#92C79A" fillcolor="#E8F0EA" shape=oval style=filled]
+	N2 [label="Retail Store Merchandising" color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+	N3 [label="Custom Apparel Design" color="#92C79A" fillcolor="#E8F0EA" shape=oval style=filled]
+	N4 [label="Return Processing" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N5 [label="Intellectual Property Protection" color="#CFCFCF" fillcolor="#F6F6F6" shape=plaintext style=filled]
+	N6 [label="Ready_to_Wear Collection Launch" color="#E0E0E0" fillcolor="#EBEBEB" shape=oval style=filled]
+	N7 [label=Packaging color="#E0E0E0" fillcolor="#EBEBEB" shape=plaintext style=filled]
+	N8 [label=Styling color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+	N9 [label="Brand Building" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	S0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#92C79A" fillcolor="#E8F0EA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Embroidery and Embellishment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Textile Manufacturing" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+		nest0_1 [label="Wholesale Distribution" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+		nest0_2 [label="Brand Licensing" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+		nest0_3 [label="Sample Creation" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Influencer Collaboration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="PR and Media Outreach" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+		nest1_1 [label="Fashion Show Production" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+		nest1_2 [label="Global Sourcing Strategy" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=patterns color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=develops color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N3 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [label=influences color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label=recycles color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_96.txt b/test/graphviz/graph_hard/graphviz_96.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3eb7bb0948e96d3b5c71a27f07ff5b3350404f2a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_96.txt
@@ -0,0 +1,33 @@
+<Brand Licensing, connectedTo, Fabric Innovation>
+<Brand Licensing, connectedTo, Global Sourcing Strategy>
+<Color Palette Selection, connectedTo, Packaging>
+<Customer Loyalty Programs, connectedTo, Influencer Collaboration>
+<Customer Loyalty Programs, partOf, Customer Loyalty Programs>
+<Distribution, connectedTo, Fabric Innovation>
+<Distribution, connectedTo, Supply Chain Transparency>
+<Embroidery and Embellishment, inspects, Haute Couture Creation>
+<Embroidery and Embellishment, stylizes, Fabric Innovation>
+<Fabric Innovation, connectedTo, Color Palette Selection>
+<Garment Fitting Session, connectedTo, Haute Couture Creation>
+<Garment Fitting Session, partOf, Garment Fitting Session>
+<Garment Production, connectedTo, Haute Couture Creation>
+<Garment Production, partOf, Garment Production>
+<Global Sourcing Strategy, connectedTo, Customer Loyalty Programs>
+<Global Sourcing Strategy, connectedTo, Embroidery and Embellishment>
+<Haute Couture Creation, connectedTo, Fabric Innovation>
+<Influencer Collaboration, connectedTo, Garment Fitting Session>
+<Influencer Collaboration, partOf, Influencer Collaboration>
+<Intellectual Property Protection, connectedTo, Pattern Making>
+<Intellectual Property Protection, trends, Distribution>
+<Inventory Management, connectedTo, Sample Creation>
+<Inventory Management, partOf, Inventory Management>
+<Packaging, influences, Quality Check>
+<Pattern Making, connectedTo, Inventory Management>
+<Pattern Making, partOf, Pattern Making>
+<Sample Creation, connectedTo, Garment Production>
+<Sample Creation, partOf, Sample Creation>
+<Supply Chain Transparency, connectedTo, Brand Licensing>
+<Supply Chain Transparency, connectedTo, Global Sourcing Strategy>
+<Supply Chain Transparency, connectedTo, Packaging>
+<Supply Chain Transparency, videos, Fabric Innovation>
+<Textile Manufacturing, connectedTo, Intellectual Property Protection>
diff --git a/test/graphviz/graph_hard/graphviz_97.dot b/test/graphviz/graph_hard/graphviz_97.dot
new file mode 100644
index 0000000000000000000000000000000000000000..39c3ad02d2da88307978eae0e8649280801b5660
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_97.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=TD
+	N0 [label="Employee Training" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N1 [label="Team Building Activities" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N2 [label="Health and Safety Management" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+	N3 [label="Offer Management" color="#7E57C2" fillcolor="#EDE7F6" shape=diamond style=filled]
+	N4 [label="HR Information System Implementation" color="#7E57C2" fillcolor="#EDE7F6" shape=diamond style=filled]
+	N5 [label="HR Policy Development" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N6 [label="Employee Engagement Surveys" color="#73C6BC" fillcolor="#D0EFEE" shape=octagon style=filled]
+	N7 [label="Compensation and Benefits" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+	N8 [label="Succession Planning" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N9 [label="Job Posting" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	S0 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Recruitment Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Payroll Processing" color="#73C6BC" fillcolor="#D0EFEE" shape=diamond style=filled]
+		nest0_1 [label="Onboarding Process" color="#7E57C2" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Work_Life Balance Initiatives" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="HR Analytics" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+		nest1_1 [label="Union Negotiations" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+		nest1_2 [label="Conflict Resolution" color="#FFC085" fillcolor="#FFDAB9" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=automates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=optimizes color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N5 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S2 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_98.dot b/test/graphviz/graph_hard/graphviz_98.dot
new file mode 100644
index 0000000000000000000000000000000000000000..04822fa71832aa4e544aa224a0b9a8f4b5f7ddda
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_98.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=RL
+	N0 [label="Leadership Training" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N1 [label="Remote Work Policy" color="#FFE69C" fillcolor="#FFF9D4" shape=Mdiamond style=filled]
+	N2 [label="Employee Engagement Surveys" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	N3 [label="Employee Handbook Creation" color="#A1D7CD" fillcolor="#EDF5F3" shape=Mdiamond style=filled]
+	N4 [label="Candidate Sourcing" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N5 [label="Job Posting" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N6 [label="Skill Development Programs" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	N7 [label="Recruitment Planning" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N8 [label="Grievance Handling" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N9 [label="Compliance Management" color="#FFE69C" fillcolor="#FFF9D4" shape=folder style=filled]
+	N10 [label="HR Budgeting" color="#FF9800" fillcolor="#FFE0B2" shape=parallelogram style=filled]
+	N11 [label="Global Mobility Programs" color="#FF9800" fillcolor="#FFE0B2" shape=octagon style=filled]
+	N12 [label="Exit Interviews" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N13 [label="Employee Data Management" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N14 [label="Payroll Processing" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	N15 [label="HR Analytics" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N16 [label="Diversity and Inclusion Initiatives" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	S0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="HR Policy Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Onboarding Process" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+		nest0_1 [label="Performance Appraisal" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Employee Relations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Team Building Activities" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+		nest1_1 [label="Succession Planning" color="#A1D7CD" fillcolor="#EDF5F3" shape=oval style=filled]
+		nest1_2 [label="Disciplinary Procedures" color="#FF9800" fillcolor="#FFE0B2" shape=folder style=filled]
+		nest1_0 -> nest1_1 [label=leads color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=complies color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=benefits color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [label=disciplines color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest0_0 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N12 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest1_0 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N1 [label=plans color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [label=secures color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [label=strategies color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_99.dot b/test/graphviz/graph_hard/graphviz_99.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e3e0e346b8bd4aeefd21dec0a2af3ad0483471e2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_99.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=TD
+	N0 [label="Onboarding Process" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N1 [label="Compensation and Benefits" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N2 [label="HR Analytics" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N3 [label="Recruitment Planning" color="#9FA9E1" fillcolor="#D6D9F0" shape=octagon style=filled]
+	N4 [label="Employee Relations" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+	N5 [label="Team Building Activities" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N6 [label="Work_Life Balance Initiatives" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N7 [label="Wellness Programs" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N8 [label="Employee Recognition Programs" color="#9FA9E1" fillcolor="#D6D9F0" shape=oval style=filled]
+	N9 [label="Leave Management" color="#61CAC3" fillcolor="#C2E8E6" shape=Mdiamond style=filled]
+	N10 [label="Offer Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=octagon style=filled]
+	N11 [label="Candidate Sourcing" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+	N12 [label="Employee Engagement Surveys" color="#61CAC3" fillcolor="#C2E8E6" shape=folder style=filled]
+	N13 [label="Succession Planning" color="#61CAC3" fillcolor="#C2E8E6" shape=parallelogram style=filled]
+	N14 [label="Skill Development Programs" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Employee Data Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Disciplinary Procedures" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+		nest0_1 [label="Talent Management" color="#94C0C0" fillcolor="#CADEDE" shape=oval style=filled]
+		nest0_2 [label="Performance Appraisal" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Employee Handbook Creation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Workforce Planning" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+		nest1_1 [label="Organizational Development" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+		nest1_2 [label="Leadership Training" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+		nest1_3 [label="Health and Safety Management" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=develops color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=trains color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [label=leads color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [label=automates color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N6 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [label=reports color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N11 [label=counsels color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N4 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_99.txt b/test/graphviz/graph_hard/graphviz_99.txt
new file mode 100644
index 0000000000000000000000000000000000000000..12f9f453272ad10ec1e0e229bfa8d5fef80e5eda
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_99.txt
@@ -0,0 +1,42 @@
+<Candidate Sourcing, connectedTo, Employee Engagement Surveys>
+<Compensation and Benefits, connectedTo, HR Analytics>
+<Compensation and Benefits, reports, Workforce Planning>
+<Disciplinary Procedures, connectedTo, Talent Management>
+<Disciplinary Procedures, partOf, Disciplinary Procedures>
+<Employee Engagement Surveys, connectedTo, Succession Planning>
+<Employee Recognition Programs, automates, Disciplinary Procedures>
+<Employee Recognition Programs, connectedTo, Employee Engagement Surveys>
+<Employee Recognition Programs, connectedTo, Leave Management>
+<Employee Recognition Programs, connectedTo, Skill Development Programs>
+<Employee Relations, connectedTo, Employee Engagement Surveys>
+<Employee Relations, connectedTo, Leave Management>
+<Employee Relations, connectedTo, Skill Development Programs>
+<Employee Relations, connectedTo, Team Building Activities>
+<HR Analytics, connectedTo, Employee Relations>
+<HR Analytics, connectedTo, Work_Life Balance Initiatives>
+<HR Analytics, develops, Recruitment Planning>
+<Health and Safety Management, counsels, Candidate Sourcing>
+<Health and Safety Management, partOf, Health and Safety Management>
+<Leadership Training, connectedTo, Health and Safety Management>
+<Leadership Training, partOf, Leadership Training>
+<Leave Management, connectedTo, Offer Management>
+<Offer Management, connectedTo, Candidate Sourcing>
+<Onboarding Process, connectedTo, Compensation and Benefits>
+<Onboarding Process, connectedTo, Employee Relations>
+<Onboarding Process, connectedTo, Work_Life Balance Initiatives>
+<Organizational Development, connectedTo, Leadership Training>
+<Organizational Development, partOf, Organizational Development>
+<Performance Appraisal, connectedTo, Work_Life Balance Initiatives>
+<Performance Appraisal, partOf, Performance Appraisal>
+<Recruitment Planning, connectedTo, Candidate Sourcing>
+<Recruitment Planning, connectedTo, Leave Management>
+<Recruitment Planning, connectedTo, Succession Planning>
+<Recruitment Planning, trains, Employee Relations>
+<Succession Planning, leads, Skill Development Programs>
+<Talent Management, connectedTo, Performance Appraisal>
+<Talent Management, partOf, Talent Management>
+<Team Building Activities, connectedTo, Work_Life Balance Initiatives>
+<Wellness Programs, connectedTo, Employee Recognition Programs>
+<Work_Life Balance Initiatives, connectedTo, Wellness Programs>
+<Workforce Planning, connectedTo, Organizational Development>
+<Workforce Planning, partOf, Workforce Planning>
diff --git a/test/graphviz/scanned_hard/graphviz_1.dot b/test/graphviz/scanned_hard/graphviz_1.dot
new file mode 100644
index 0000000000000000000000000000000000000000..81d13afa67c8ebfb37892829c6b467b2f28ac31d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_1.dot
@@ -0,0 +1,27 @@
+digraph {
+	rankdir=TD
+	N0 [label="Approval Decision" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Forex Trading" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N2 [label="Asset Management" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N3 [label="KYC Validation" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N4 [label="Payment Gateway Integration" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N5 [label="Tax Preparation" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N6 [label="Portfolio Management" color="#FF8A65" fillcolor="#FBE9E7" shape=oval style=filled]
+	N7 [label="Credit Card Application" color="#FF8A65" fillcolor="#FBE9E7" shape=Mdiamond style=filled]
+	N8 [label="Financial Advisory" color="#5C6BC0" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N9 [label="Income Verification" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N10 [label="Investment Planning" color="#FFC2C2" fillcolor="#FFEBEB" shape=octagon style=filled]
+	N11 [label="Account Verification" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N0 -> N1 [label=monitors color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=reconciles color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=settles color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=reports color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=scores color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=approves color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_1.txt b/test/graphviz/scanned_hard/graphviz_1.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d5ca237e85d72533ac1b72f79b01bf8ab2ba951e
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_1.txt
@@ -0,0 +1,12 @@
+<Approval Decision, monitors, Forex Trading>
+<Asset Management, connectedTo, KYC Validation>
+<Credit Card Application, settles, Financial Advisory>
+<Financial Advisory, reports, Income Verification>
+<Forex Trading, connectedTo, Asset Management>
+<Income Verification, scores, Investment Planning>
+<Investment Planning, approves, Account Verification>
+<KYC Validation, connectedTo, Account Verification>
+<KYC Validation, reconciles, Payment Gateway Integration>
+<Payment Gateway Integration, connectedTo, Tax Preparation>
+<Portfolio Management, connectedTo, Credit Card Application>
+<Tax Preparation, connectedTo, Portfolio Management>
diff --git a/test/graphviz/scanned_hard/graphviz_10.dot b/test/graphviz/scanned_hard/graphviz_10.dot
new file mode 100644
index 0000000000000000000000000000000000000000..85559d9ae4885a3710e0df56aa7439d8f9bd414c
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_10.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=TD
+	N0 [label="Data Usage Logging" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="MMS Transmission" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N2 [label="Service Level Agreement" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N3 [label="Fraudulent Call Blocking" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N4 [label="Customer Relationship Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N5 [label="Network Upgrade" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N6 [label="Video Conferencing" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N7 [label="Mobile Top_up" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N8 [label="Outage Detection" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N9 [label="VoIP Service" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N0 -> N1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=complains color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=notifies color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=secures color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=audits color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N2 [label=maintains color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_10.txt b/test/graphviz/scanned_hard/graphviz_10.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a177310ec0f35d81c0be20ec89e69e140a52c170
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_10.txt
@@ -0,0 +1,10 @@
+<Customer Relationship Management, connectedTo, Network Upgrade>
+<Data Usage Logging, connectedTo, MMS Transmission>
+<Fraudulent Call Blocking, notifies, Customer Relationship Management>
+<MMS Transmission, complains, Service Level Agreement>
+<Mobile Top_up, connectedTo, Outage Detection>
+<Network Upgrade, secures, Video Conferencing>
+<Outage Detection, audits, VoIP Service>
+<Service Level Agreement, connectedTo, Fraudulent Call Blocking>
+<Video Conferencing, connectedTo, Mobile Top_up>
+<VoIP Service, maintains, Service Level Agreement>
diff --git a/test/graphviz/scanned_hard/graphviz_100.dot b/test/graphviz/scanned_hard/graphviz_100.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3b8ec243e2a9f2d3171b19968d65264b7fd84378
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_100.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=RL
+	N0 [label="Code of Conduct Implementation" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N1 [label="Bias Mitigation" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N2 [label="Sanctions Compliance" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N3 [label="Regulatory Interpretation" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N4 [label="Stakeholder Engagement on Ethics" color="#82DAFF" fillcolor="#C8EDFF" shape=plaintext style=filled]
+	N5 [label="Compliance Training" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+	N6 [label="Ethical Leadership Development" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N7 [label="Risk Assessment" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N8 [label="Data Privacy Compliance" color="#82DAFF" fillcolor="#C8EDFF" shape=plaintext style=filled]
+	N9 [label="Anti_Money Laundering Compliance" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N0 -> N1 [label=audits color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=procedures color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=develops color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N0 [label=counsels color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N3 -> N5 [label=transparency color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_101.dot b/test/graphviz/scanned_hard/graphviz_101.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a2f118cd30018b646ee67d91e1dbb3ecbe938d46
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_101.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=LR
+	N0 [label="Handwriting Analysis" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N1 [label="Cold Case Review" color="#EAEFA5" fillcolor="#FDFCEB" shape=diamond style=filled]
+	N2 [label="Expert Witness Testimony" color="#E0E0E0" fillcolor="#EBEBEB" shape=parallelogram style=filled]
+	N3 [label="Arson Investigation" color="#EAEFA5" fillcolor="#FDFCEB" shape=plaintext style=filled]
+	N4 [label="Trace Evidence Analysis" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N5 [label="Cyber Crime Investigation" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N6 [label="Voice Recognition" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N7 [label="Forensic Entomology" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N8 [label="Cloud Forensics" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N9 [label="Forensic Odontology" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=validates color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=audits color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=sketches color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=documents color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=tests color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N5 [label=digital_forensics color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_101.txt b/test/graphviz/scanned_hard/graphviz_101.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1f3f8055685da265b0748ad903ef21637c8ec28e
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_101.txt
@@ -0,0 +1,10 @@
+<Arson Investigation, connectedTo, Trace Evidence Analysis>
+<Cloud Forensics, tests, Forensic Odontology>
+<Cold Case Review, validates, Expert Witness Testimony>
+<Cyber Crime Investigation, connectedTo, Voice Recognition>
+<Expert Witness Testimony, connectedTo, Arson Investigation>
+<Forensic Entomology, documents, Cloud Forensics>
+<Handwriting Analysis, connectedTo, Cold Case Review>
+<Trace Evidence Analysis, audits, Cyber Crime Investigation>
+<Voice Recognition, digital_forensics, Cyber Crime Investigation>
+<Voice Recognition, sketches, Forensic Entomology>
diff --git a/test/graphviz/scanned_hard/graphviz_104.txt b/test/graphviz/scanned_hard/graphviz_104.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c021afa9e54445d6c477c9ec9e77d47b1ebc94e5
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_104.txt
@@ -0,0 +1,11 @@
+<CCTV Installation, connectedTo, Rehabilitation Programs>
+<Conflict Resolution Training, licenses, Target Hardening>
+<Crime Prevention Through Education, investigates, Technology for Prevention>
+<Cybercrime Prevention, connectedTo, Robbery Prevention>
+<Cybercrime Prevention, hotspots, Sexual Assault Prevention>
+<Gang Intervention, connectedTo, Cybercrime Prevention>
+<Rehabilitation Programs, connectedTo, Gang Intervention>
+<Robbery Prevention, deters, CCTV Installation>
+<Sexual Assault Prevention, connectedTo, Robbery Prevention>
+<Target Hardening, responds, Crime Prevention Through Education>
+<Technology for Prevention, connectedTo, Rehabilitation Programs>
diff --git a/test/graphviz/scanned_hard/graphviz_105.txt b/test/graphviz/scanned_hard/graphviz_105.txt
new file mode 100644
index 0000000000000000000000000000000000000000..457454425723f6feb5f0c94bc1b84ce2c4359d5c
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_105.txt
@@ -0,0 +1,9 @@
+<Drone_based Monitoring, surveys, Research and Development in Conservation>
+<GIS Mapping for Habitats, warns, Marine Conservation>
+<Invasive Species Control, data_collects, GIS Mapping for Habitats>
+<Law Enforcement, eco_tourism_promotes, Policy Advocacy>
+<Marine Conservation, connectedTo, Protected Area Management>
+<Policy Advocacy, connectedTo, Drone_based Monitoring>
+<Protected Area Management, connectedTo, Translocation of Species>
+<Research and Development in Conservation, connectedTo, Law Enforcement>
+<Translocation of Species, connectedTo, Law Enforcement>
diff --git a/test/graphviz/scanned_hard/graphviz_106.txt b/test/graphviz/scanned_hard/graphviz_106.txt
new file mode 100644
index 0000000000000000000000000000000000000000..918419758a569bfa9ad5a9725143e765e9f113e9
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_106.txt
@@ -0,0 +1,10 @@
+<Coastal Erosion Research, connectedTo, Sea Level Monitoring>
+<Hydrothermal Vent Exploration, connectedTo, Seabed Resource Exploration>
+<Marine Biodiversity Assessment, develops_instruments, Marine Hazards Assessment>
+<Marine Hazards Assessment, connectedTo, Hydrothermal Vent Exploration>
+<Marine Pollution Monitoring, collects_data, Ocean Data Archiving>
+<Ocean Data Archiving, connectedTo, Marine Biodiversity Assessment>
+<Ocean Data Archiving, interprets, Marine Hazards Assessment>
+<Ocean Renewable Energy, geology, Marine Ecosystem Health>
+<Sea Level Monitoring, educates, Ocean Renewable Energy>
+<Seabed Resource Exploration, connectedTo, Coastal Erosion Research>
diff --git a/test/graphviz/scanned_hard/graphviz_107.dot b/test/graphviz/scanned_hard/graphviz_107.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b582c98c7838efb49daacb1ce411b725ff4f776f
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_107.dot
@@ -0,0 +1,28 @@
+digraph {
+	rankdir=LR
+	N0 [label="Seismic Data Processing" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N1 [label="Seismic Wave Analysis" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N2 [label="Tectonic Stress Measurement" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N3 [label="Epicenter Location" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N4 [label=Paleoseismology color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N5 [label="Building Code Development" color="#FFD54F" fillcolor="#FFF8E1" shape=parallelogram style=filled]
+	N6 [label="Aftershock Analysis" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N7 [label="Computational Seismology" color="#FFC2C2" fillcolor="#FFEBEB" shape=parallelogram style=filled]
+	N8 [label="Glacial Seismology" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N9 [label="Nuclear Test Monitoring" color="#FFE69C" fillcolor="#FFF9D4" shape=Mdiamond style=filled]
+	N10 [label="Deep Earth Seismology" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N11 [label="P_Wave or S_Wave Distinction" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N0 -> N1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=earthquakes_studies color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=tsunamis_monitors color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=predicts color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=reports color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=warns color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N5 [label=ground_motion color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N0 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_108.dot b/test/graphviz/scanned_hard/graphviz_108.dot
new file mode 100644
index 0000000000000000000000000000000000000000..26dface324aa630ea008e7f4af2a9a1ae13765a3
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_108.dot
@@ -0,0 +1,25 @@
+digraph {
+	rankdir=RL
+	N0 [label="Disease Gene Identification" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N1 [label="Genome_Wide Association Studies" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N2 [label="Gene Annotation" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N3 [label="Methylation Analysis" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N4 [label="DNA Sequencing" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N5 [label="Cancer Genomics" color="#CFCFCF" fillcolor="#F6F6F6" shape=diamond style=filled]
+	N6 [label="Rare Disease Genomics" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N7 [label="Gene Therapy Development" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N8 [label="Genome Assembly" color="#388E3C" fillcolor="#F1F8E9" shape=oval style=filled]
+	N9 [label="Genomic Data Visualization" color="#E0E0E0" fillcolor="#EBEBEB" shape=oval style=filled]
+	N10 [label="Genomic Editing" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N0 -> N1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=complies color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=analyzes color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=algorithms_develops color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=licenses color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N10 [label=data_generates color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_11.dot b/test/graphviz/scanned_hard/graphviz_11.dot
new file mode 100644
index 0000000000000000000000000000000000000000..03c6211f0059dff11ff8abe75112c3486c6de4be
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_11.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=RL
+	N0 [label="Disease Detection" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N1 [label="Grain Drying" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N2 [label="Barn Cleaning" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N3 [label="Market Transportation" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N4 [label="Aquaculture Farming" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N5 [label="Packaging for Sale" color="#03A9F4" fillcolor="#B3E5FC" shape=hexagon style=filled]
+	N6 [label="Soil Nutrient Management" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N7 [label="Pest Spraying" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N8 [label="Supply Chain to Retailers" color="#F06292" fillcolor="#FCE4EC" shape=oval style=filled]
+	N9 [label="Organic Certification" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N0 -> N1 [label=conserves color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=certifies color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=innovates color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=fertilizes color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N8 [label=develops color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_111.dot b/test/graphviz/scanned_hard/graphviz_111.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cfc900a6a7ce83b9cabb4956d8164ad91f6f7541
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_111.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=BT
+	N0 [label="Lifecycle Management" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N1 [label="Scalability of Models" color="#F44336" fillcolor="#FFCDD2" shape=oval style=filled]
+	N2 [label="Autonomous Operations" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N3 [label="Condition Monitoring" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N4 [label="AI or ML Model Integration" color="#E91E63" fillcolor="#F8BBD0" shape=plaintext style=filled]
+	N5 [label="Building Information Modeling Integration" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N6 [label="Energy Consumption Optimization" color="#E91E63" fillcolor="#F8BBD0" shape=Mdiamond style=filled]
+	N7 [label="System Integration Architecture" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N0 -> N1 [label=maintains color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=optimizes color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=governs color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=monitors color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=creates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N7 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_111.txt b/test/graphviz/scanned_hard/graphviz_111.txt
new file mode 100644
index 0000000000000000000000000000000000000000..91d589a5d34b9c2a0d573f2732de575b9319c4f2
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_111.txt
@@ -0,0 +1,8 @@
+<AI or ML Model Integration, monitors, Building Information Modeling Integration>
+<Autonomous Operations, connectedTo, System Integration Architecture>
+<Autonomous Operations, optimizes, Condition Monitoring>
+<Building Information Modeling Integration, connectedTo, Energy Consumption Optimization>
+<Condition Monitoring, governs, AI or ML Model Integration>
+<Energy Consumption Optimization, creates, System Integration Architecture>
+<Lifecycle Management, maintains, Scalability of Models>
+<Scalability of Models, connectedTo, Autonomous Operations>
diff --git a/test/graphviz/scanned_hard/graphviz_113.txt b/test/graphviz/scanned_hard/graphviz_113.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3beb786c6db3275f6fb36f2bd570d7eecf97a0d6
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_113.txt
@@ -0,0 +1,11 @@
+<Calibration of Instruments, connectedTo, Service Quality Management>
+<Lean Principles in Quality, certifies, Trend Analysis>
+<Process Monitoring, complies, Service Quality Management>
+<Process Monitoring, risk_manages, Quality Control Tools>
+<Quality Control Tools, connectedTo, Calibration of Instruments>
+<Risk_Based Quality Control, standards_sets, Software Quality Assurance>
+<Root Cause Analysis, automates, Supplier Quality Management>
+<Service Quality Management, connectedTo, Lean Principles in Quality>
+<Software Quality Assurance, defects_detects, Statistical Process Control>
+<Statistical Process Control, connectedTo, Process Monitoring>
+<Trend Analysis, systems_controls, Root Cause Analysis>
diff --git a/test/graphviz/scanned_hard/graphviz_117.txt b/test/graphviz/scanned_hard/graphviz_117.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3b679a630d4da8c938d1acce50912bb4fdd418d0
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_117.txt
@@ -0,0 +1,8 @@
+<Behavioral Neuroscience, models, Systems Neuroscience>
+<Connectomics, discovers, Motor Control Research>
+<Genetic Basis of Brain Disorders, trains, Neural Data Analysis>
+<Learning Mechanisms Study, cognition_studies, Neural Network Analysis>
+<Learning Mechanisms Study, connectedTo, Connectomics>
+<Neural Data Analysis, connectedTo, Behavioral Neuroscience>
+<Neural Network Analysis, interprets_data, Learning Mechanisms Study>
+<Systems Neuroscience, connectedTo, Neural Network Analysis>
diff --git a/test/graphviz/scanned_hard/graphviz_118.txt b/test/graphviz/scanned_hard/graphviz_118.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ea49c081d569ce84a01687b23247add6b534eff2
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_118.txt
@@ -0,0 +1,9 @@
+<Archival Management, data_collects, Augmented Reality Tours>
+<Artifact Conservation, connectedTo, Underwater Cultural Heritage>
+<Augmented Reality Tours, connectedTo, Digital Storytelling>
+<Augmented Reality Tours, technologies_applies, Virtual Reality Recreations>
+<Climate Change Impact on Heritage, artifacts_excavates, Artifact Conservation>
+<Digital Storytelling, sites_surveys, Archival Management>
+<Disaster Preparedness for Heritage, connectedTo, Heritage Site Management>
+<Heritage Site Management, catalogs, Digital Storytelling>
+<Underwater Cultural Heritage, connectedTo, Disaster Preparedness for Heritage>
diff --git a/test/graphviz/scanned_hard/graphviz_12.txt b/test/graphviz/scanned_hard/graphviz_12.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5b3b1e913eb2e0595068b724737520dfadd9964e
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_12.txt
@@ -0,0 +1,13 @@
+<Booking Modification, documents, Event Reservation>
+<Concert Ticketing, consults, Local Transport>
+<Custom Tour Package Creation, assists, Visa Application>
+<Event Reservation, connectedTo, Cruise Ship Boarding>
+<Group Tour Coordination, connectedTo, Sightseeing Scheduling>
+<Group Tour Coordination, personalizes, Cruise Ship Boarding>
+<Hotel Check_in, collects feedback, Custom Tour Package Creation>
+<Local Transport, visits, Tourist Information Desk>
+<Sightseeing Scheduling, connectedTo, Concert Ticketing>
+<Sightseeing Scheduling, connectedTo, Spa Appointment>
+<Spa Appointment, sells, Hotel Check_in>
+<Tourist Information Desk, connectedTo, Spa Appointment>
+<Visa Application, returns, Booking Modification>
diff --git a/test/graphviz/scanned_hard/graphviz_121.dot b/test/graphviz/scanned_hard/graphviz_121.dot
new file mode 100644
index 0000000000000000000000000000000000000000..bf9a94bf6fa62f3f7eef98f277dbcab9a7e1ce45
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_121.dot
@@ -0,0 +1,45 @@
+digraph {
+	rankdir=TD
+	N0 [label="Humidity Sensing" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N1 [label="Meteorological Instrument Calibration" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N2 [label="Wind Speed and Direction" color="#64B5F6" fillcolor="#E3F2FD" shape=oval style=filled]
+	N3 [label="Meteorological Station Maintenance" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N4 [label="Numerical Weather Prediction" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N5 [label="Arctic Weather Research" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N6 [label="Boundary Layer Study" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+	N7 [label="Climate Data Archiving" color="#FFF8A6" fillcolor="#FFFDE0" shape=folder style=filled]
+	N8 [label="Upper Air Chart Analysis" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	S0 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#D2D2D2" fillcolor="#F0F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Air Quality Forecasting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Flood Prediction" color="#FFF8A6" fillcolor="#FFFDE0" shape=octagon style=filled]
+		nest0_1 [label="Mesoscale Meteorology" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest0_2 [label="Weather Forecasting" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+		nest0_3 [label="Lightning Detection" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [label=analyzes color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=disseminates color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [label=generates color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N7 [label=maintains color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [label=advises color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [label=researches color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_122.dot b/test/graphviz/scanned_hard/graphviz_122.dot
new file mode 100644
index 0000000000000000000000000000000000000000..af24a7ecf8ac7b8983d6463a8842e4efdfdbd984
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_122.dot
@@ -0,0 +1,39 @@
+digraph {
+	rankdir=TD
+	N0 [label="Severe Weather Warning" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N1 [label="Drought Monitoring" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N2 [label="Tornado Watch or Warning" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N3 [label="Meteorological Station Maintenance" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N4 [label="Flood Prediction" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N5 [label="Mesoscale Meteorology" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N6 [label="Atmospheric Data Collection" color="#81C784" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N7 [label="Ocean_Atmosphere Interaction Study" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N8 [label="Humidity Sensing" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Cloud Observation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Seasonal Outlook Preparation" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+		nest0_1 [label="Wind Speed and Direction" color="#81C784" fillcolor="#F1F8E9" shape=folder style=filled]
+		nest0_2 [label="Boundary Layer Study" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest0_3 [label="Aviation Weather Briefing" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [label=validates color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=calibrates color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=integrates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=studies color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [label=supports color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_123.dot b/test/graphviz/scanned_hard/graphviz_123.dot
new file mode 100644
index 0000000000000000000000000000000000000000..633c8a7863dba023a9f3d60feb46d9c0639bb380
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_123.dot
@@ -0,0 +1,54 @@
+digraph {
+	rankdir=LR
+	N0 [label="Precipitation Measurement" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N1 [label="Synoptic Chart Analysis" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N2 [label="Climate Modeling" color="#FBC02D" fillcolor="#FFFDE7" shape=octagon style=filled]
+	N3 [label="Tornado Watch or Warning" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N4 [label="Agricultural Weather Advisory" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N5 [label="Tropical Cyclone Analysis" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N6 [label="Hurricane Trajectory Modeling" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+	N7 [label="Climate Data Archiving" color="#F44336" fillcolor="#FFCDD2" shape=oval style=filled]
+	N8 [label="Boundary Layer Study" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N9 [label="Ocean_Atmosphere Interaction Study" color="#F44336" fillcolor="#FFCDD2" shape=octagon style=filled]
+	N10 [label="Drought Monitoring" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N11 [label="Severe Weather Warning" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N12 [label="Mesoscale Meteorology" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N13 [label="Seasonal Outlook Preparation" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Cloud Observation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Storm Tracking" color="#FFDA4E" fillcolor="#FFE88D" shape=plaintext style=filled]
+		nest0_1 [label="Numerical Weather Prediction" color="#FFDA4E" fillcolor="#FFE88D" shape=octagon style=filled]
+		nest0_2 [label="Atmospheric Sounding" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=retrieves color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=alerts color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=maintains color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=detects color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label=integrates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [label=analyzes color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N9 [label=models color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [label=simulates color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [label=generates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N13 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_123.txt b/test/graphviz/scanned_hard/graphviz_123.txt
new file mode 100644
index 0000000000000000000000000000000000000000..af377194fb6c68b03c589b96497bfb3fd81a8b99
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_123.txt
@@ -0,0 +1,27 @@
+<Agricultural Weather Advisory, connectedTo, Mesoscale Meteorology>
+<Agricultural Weather Advisory, connectedTo, Ocean_Atmosphere Interaction Study>
+<Agricultural Weather Advisory, connectedTo, Seasonal Outlook Preparation>
+<Agricultural Weather Advisory, maintains, Tropical Cyclone Analysis>
+<Atmospheric Sounding, models, Ocean_Atmosphere Interaction Study>
+<Atmospheric Sounding, partOf, Atmospheric Sounding>
+<Boundary Layer Study, connectedTo, Ocean_Atmosphere Interaction Study>
+<Climate Data Archiving, connectedTo, Boundary Layer Study>
+<Climate Modeling, alerts, Tornado Watch or Warning>
+<Drought Monitoring, detects, Severe Weather Warning>
+<Hurricane Trajectory Modeling, connectedTo, Climate Data Archiving>
+<Mesoscale Meteorology, analyzes, Seasonal Outlook Preparation>
+<Numerical Weather Prediction, connectedTo, Atmospheric Sounding>
+<Numerical Weather Prediction, partOf, Numerical Weather Prediction>
+<Ocean_Atmosphere Interaction Study, connectedTo, Drought Monitoring>
+<Precipitation Measurement, connectedTo, Synoptic Chart Analysis>
+<Severe Weather Warning, integrates, Mesoscale Meteorology>
+<Storm Tracking, connectedTo, Numerical Weather Prediction>
+<Storm Tracking, partOf, Storm Tracking>
+<Synoptic Chart Analysis, retrieves, Climate Modeling>
+<Tornado Watch or Warning, connectedTo, Agricultural Weather Advisory>
+<Tornado Watch or Warning, connectedTo, Climate Data Archiving>
+<Tornado Watch or Warning, generates, Mesoscale Meteorology>
+<Tornado Watch or Warning, simulates, Seasonal Outlook Preparation>
+<Tropical Cyclone Analysis, connectedTo, Hurricane Trajectory Modeling>
+<Tropical Cyclone Analysis, connectedTo, Seasonal Outlook Preparation>
+<Tropical Cyclone Analysis, connectedTo, Storm Tracking>
diff --git a/test/graphviz/scanned_hard/graphviz_125.dot b/test/graphviz/scanned_hard/graphviz_125.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6ff4b6e6f129eed2a9bf156faa908ebaada85c2d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_125.dot
@@ -0,0 +1,43 @@
+digraph {
+	rankdir=LR
+	N0 [label="Metal Recycling" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N1 [label="Biomedical Waste Handling" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+	N2 [label="Material Recovery Facility Operation" color="#FFCC80" fillcolor="#FFF0CC" shape=oval style=filled]
+	N3 [label="Public Education on Waste" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N4 [label="Organics Collection" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+	N5 [label="Smart Waste Bins" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N6 [label="Waste Collection" color="#81C784" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N7 [label="Landfill Gas Collection" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N8 [label="Resource Recovery" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#81C784" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Glass Recycling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Waste Reduction Planning" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+		nest0_1 [label="Zero Waste Initiatives" color="#81C784" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+		nest0_2 [label="Textile Recycling" color="#FFCC80" fillcolor="#FFF0CC" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=licenses color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=operates color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N2 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [label=minimizes color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [label=disposes color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_126.dot b/test/graphviz/scanned_hard/graphviz_126.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9b932e77f63b663ccff8ce762788b4f0786492ed
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_126.dot
@@ -0,0 +1,40 @@
+digraph {
+	rankdir=BT
+	N0 [label="Hazardous Waste Disposal" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N1 [label="Zero Waste Initiatives" color="#CFCFCF" fillcolor="#F6F6F6" shape=Mdiamond style=filled]
+	N2 [label="Community Recycling Programs" color="#4DD0E1" fillcolor="#C9F0F0" shape=octagon style=filled]
+	N3 [label="Container Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N4 [label="Waste Characterization Study" color="#CFCFCF" fillcolor="#F6F6F6" shape=plaintext style=filled]
+	N5 [label="Waste Compaction" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N6 [label="Leachate Treatment" color="#4DD0E1" fillcolor="#C9F0F0" shape=diamond style=filled]
+	N7 [label="Waste Audit" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	S0 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Waste Sorting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Biomedical Waste Handling" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+		nest0_1 [label="Closed_Loop Systems" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=compresses color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [label=incinerates color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N3 [label=collects color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [label=reports color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=compacts color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [label=extracts color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_127.txt b/test/graphviz/scanned_hard/graphviz_127.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0834116c99d3ec21e7d6ff99edf7370bc809bfc5
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_127.txt
@@ -0,0 +1,25 @@
+<Billing and Revenue Management, connectedTo, Hydroelectric Power Generation>
+<Dam Management, partOf, Dam Management>
+<Dam Management, recycles, Pollution Source Identification>
+<Drought Management, supplies, Pollution Source Identification>
+<Ecosystem Protection, connectedTo, Water Treatment>
+<Environmental Flow Assessment, connectedTo, Groundwater Management>
+<Environmental Flow Assessment, connectedTo, Rainwater Harvesting>
+<Environmental Flow Assessment, warns, Water Treatment>
+<Groundwater Management, connectedTo, Ecosystem Protection>
+<Hydroelectric Power Generation, connectedTo, Environmental Flow Assessment>
+<Irrigation Management, collects, Water Rights Management>
+<Irrigation Management, partOf, Irrigation Management>
+<Piping Network Repair, connectedTo, Water Loss Detection>
+<Pollution Source Identification, connectedTo, Irrigation Management>
+<Pollution Source Identification, connectedTo, Reservoir Operation>
+<Public Awareness Campaigns, connectedTo, Water Meter Reading>
+<Reservoir Operation, connectedTo, Billing and Revenue Management>
+<Reservoir Operation, purifies, Public Awareness Campaigns>
+<Water Loss Detection, connectedTo, Drought Management>
+<Water Meter Reading, connectedTo, Rainwater Harvesting>
+<Water Quality Monitoring, connectedTo, Public Awareness Campaigns>
+<Water Rights Management, drains, Dam Management>
+<Water Rights Management, partOf, Water Rights Management>
+<Water Treatment, connectedTo, Public Awareness Campaigns>
+<Water Treatment, connectedTo, Water Quality Monitoring>
diff --git a/test/graphviz/scanned_hard/graphviz_129.txt b/test/graphviz/scanned_hard/graphviz_129.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c6f0b227dcaaf631bd5265411d53f46034893961
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_129.txt
@@ -0,0 +1,27 @@
+<Climate Change Adaptation for Water, connectedTo, Water Treatment>
+<Climate Change Adaptation for Water, partOf, Climate Change Adaptation for Water>
+<Dam Management, connectedTo, Drinking Water Standards Compliance>
+<Dam Management, connectedTo, Water Conservation Planning>
+<Dam Management, connectedTo, Water Distribution>
+<Dam Management, connectedTo, Water Rights Management>
+<Dam Management, distributes, Water Rights Management>
+<Drinking Water Standards Compliance, connectedTo, Water Rights Management>
+<Environmental Flow Assessment, consults, Drinking Water Standards Compliance>
+<Environmental Flow Assessment, partOf, Environmental Flow Assessment>
+<Piping Network Repair, connectedTo, Environmental Flow Assessment>
+<Piping Network Repair, partOf, Piping Network Repair>
+<Reservoir Operation, analyzes, Water Distribution>
+<Reservoir Operation, connectedTo, Water Resource Planning>
+<Reservoir Operation, connectedTo, Water Rights Management>
+<Reservoir Operation, monitors, Stormwater Management>
+<Reservoir Operation, secures, Water Rights Management>
+<Stormwater Management, connectedTo, Dam Management>
+<Stormwater Management, tests, Drinking Water Standards Compliance>
+<Water Distribution, connectedTo, Climate Change Adaptation for Water>
+<Water Distribution, connectedTo, Water Conservation Planning>
+<Water Resource Planning, connectedTo, Drinking Water Standards Compliance>
+<Water Resource Planning, connectedTo, Stormwater Management>
+<Water Resource Planning, connectedTo, Water Rights Management>
+<Water Rights Management, connectedTo, Water Distribution>
+<Water Treatment, partOf, Water Treatment>
+<Water Treatment, protects, Piping Network Repair>
diff --git a/test/graphviz/scanned_hard/graphviz_130.dot b/test/graphviz/scanned_hard/graphviz_130.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d97a185997c0eb4ad386fa4d0f6ce21c9025f6a4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_130.dot
@@ -0,0 +1,53 @@
+digraph {
+	rankdir=RL
+	N0 [label="Reprocessing into Raw Material" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N1 [label="Battery Recycling" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N2 [label="Composting Organic Waste" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N3 [label="Recycling Market Development" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N4 [label="Plastic Recycling" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N5 [label="Contamination Reduction" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N6 [label="Electronic Waste Recycling" color="#9FA9E1" fillcolor="#D6D9F0" shape=Mdiamond style=filled]
+	N7 [label="Industrial Recycling Programs" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N8 [label="End_of_Life Product Management" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N9 [label="Recycling Policy Advocacy" color="#9FA9E1" fillcolor="#D6D9F0" shape=octagon style=filled]
+	N10 [label="Circular Economy Implementation" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N11 [label="Advanced Sorting Technologies" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N12 [label="Commercial Recycling Solutions" color="#7E57C2" fillcolor="#EDE7F6" shape=folder style=filled]
+	N13 [label="Cleaning and Processing" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Metal Recycling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Recycling Facility Optimization" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+		nest0_1 [label="Collection Point Management" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+		nest0_2 [label="New Product Manufacturing" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=tracks color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [label=converts color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [label=complies color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N2 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [label=supports color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_132.dot b/test/graphviz/scanned_hard/graphviz_132.dot
new file mode 100644
index 0000000000000000000000000000000000000000..14f390d0a25b7b0645898554255d608225db29c8
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_132.dot
@@ -0,0 +1,45 @@
+digraph {
+	rankdir=LR
+	N0 [label="Recycling Policy Advocacy" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Composting Organic Waste" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N2 [label="Chemical Recycling" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N3 [label="Commercial Recycling Solutions" color="#673AB7" fillcolor="#D1C4E9" shape=folder style=filled]
+	N4 [label="Sorting and Segregation" color="#673AB7" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+	N5 [label="Paper Recycling" color="#607D8B" fillcolor="#CFD8DC" shape=Mdiamond style=filled]
+	N6 [label="Material Collection" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N7 [label="Recycling Market Development" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N8 [label="Advanced Sorting Technologies" color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N9 [label="Energy Recovery from Non_Recyclables" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N10 [label="Product Design for Recyclability" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N11 [label="Material Purity Testing" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N12 [label="Metal Recycling" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	M0 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Construction Waste Recycling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Deposit_Return Schemes" color="#607D8B" fillcolor="#CFD8DC" shape=octagon style=filled]
+		nest0_1 [label="Cleaning and Processing" color="#D3EB9F" fillcolor="#F8FDD3" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=reports color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=promotes color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=tracks color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=converts color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [label=forms color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [label=sorts color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_132.txt b/test/graphviz/scanned_hard/graphviz_132.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4352bea3fc73701bb92be6e2f3a44daf8f3aee55
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_132.txt
@@ -0,0 +1,21 @@
+<Advanced Sorting Technologies, converts, Energy Recovery from Non_Recyclables>
+<Chemical Recycling, connectedTo, Deposit_Return Schemes>
+<Chemical Recycling, connectedTo, Recycling Market Development>
+<Chemical Recycling, promotes, Commercial Recycling Solutions>
+<Cleaning and Processing, connectedTo, Energy Recovery from Non_Recyclables>
+<Cleaning and Processing, partOf, Cleaning and Processing>
+<Commercial Recycling Solutions, connectedTo, Material Collection>
+<Commercial Recycling Solutions, connectedTo, Sorting and Segregation>
+<Composting Organic Waste, forms, Material Collection>
+<Composting Organic Waste, reports, Chemical Recycling>
+<Deposit_Return Schemes, connectedTo, Cleaning and Processing>
+<Deposit_Return Schemes, partOf, Deposit_Return Schemes>
+<Energy Recovery from Non_Recyclables, connectedTo, Product Design for Recyclability>
+<Material Collection, connectedTo, Recycling Market Development>
+<Material Purity Testing, connectedTo, Metal Recycling>
+<Paper Recycling, tracks, Material Collection>
+<Product Design for Recyclability, connectedTo, Material Purity Testing>
+<Recycling Market Development, connectedTo, Advanced Sorting Technologies>
+<Recycling Policy Advocacy, connectedTo, Composting Organic Waste>
+<Sorting and Segregation, connectedTo, Paper Recycling>
+<Sorting and Segregation, sorts, Recycling Market Development>
diff --git a/test/graphviz/scanned_hard/graphviz_133.txt b/test/graphviz/scanned_hard/graphviz_133.txt
new file mode 100644
index 0000000000000000000000000000000000000000..657a07be6a393ae1618e50e613d26fdad43e09f0
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_133.txt
@@ -0,0 +1,20 @@
+<Agroforestry Systems, enforces, Wood Product Manufacturing>
+<Biodiversity Conservation in Forests, connectedTo, Agroforestry Systems>
+<Biodiversity Conservation in Forests, connectedTo, Ecological Restoration>
+<Biodiversity Conservation in Forests, connectedTo, Recreation Management>
+<Biomass Production from Forests, connectedTo, Biodiversity Conservation in Forests>
+<Biomass Production from Forests, connectedTo, Recreation Management>
+<Ecological Restoration, connectedTo, Recreation Management>
+<Erosion Control, connectedTo, Biomass Production from Forests>
+<Forest Certification, connectedTo, Biodiversity Conservation in Forests>
+<Forest Certification, partOf, Forest Certification>
+<Logging Operations, harvests, Forest Certification>
+<Logging Operations, partOf, Logging Operations>
+<Pest and Disease Control, connectedTo, Erosion Control>
+<Recreation Management, connectedTo, Logging Operations>
+<Recreation Management, connectedTo, Tree Nursery Management>
+<Reforestation, connectedTo, Pest and Disease Control>
+<Sustainable Forest Management, connectedTo, Reforestation>
+<Tree Nursery Management, connectedTo, Illegal Logging Prevention>
+<Wood Product Manufacturing, connectedTo, Ecological Restoration>
+<Wood Product Manufacturing, repairs, Recreation Management>
diff --git a/test/graphviz/scanned_hard/graphviz_136.txt b/test/graphviz/scanned_hard/graphviz_136.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b8368aa33ec7be461136628960b638b08fa35e32
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_136.txt
@@ -0,0 +1,21 @@
+<Allergy Testing, connectedTo, Prescription>
+<Anesthesia Administration, connectedTo, Diagnosis>
+<Anesthesia Administration, partOf, Anesthesia Administration>
+<Diagnosis, connectedTo, Medical Record Keeping>
+<Medical Record Keeping, connectedTo, Prescription>
+<Medical Record Keeping, connectedTo, Reproductive Services>
+<Medical Record Keeping, connectedTo, Wildlife Rehabilitation>
+<Medical Record Keeping, reproduces, Allergy Testing>
+<Microchipping, connectedTo, Pharmacy Management>
+<Microchipping, recommends, Pre_surgical Assessment>
+<Nutritional Counseling, anesthetizes, Microchipping>
+<Nutritional Counseling, connectedTo, Allergy Testing>
+<Nutritional Counseling, connectedTo, Diagnosis>
+<Nutritional Counseling, connectedTo, Pharmacy Management>
+<Parasite Control, connectedTo, Pharmacy Management>
+<Parasite Control, educates, Nutritional Counseling>
+<Pharmacy Management, diagnoses, Diagnosis>
+<Pre_surgical Assessment, connectedTo, Anesthesia Administration>
+<Pre_surgical Assessment, partOf, Pre_surgical Assessment>
+<Reproductive Services, connectedTo, Allergy Testing>
+<Wildlife Rehabilitation, connectedTo, Reproductive Services>
diff --git a/test/graphviz/scanned_hard/graphviz_137.dot b/test/graphviz/scanned_hard/graphviz_137.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cfa82a19624576651078358d519e05693407a965
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_137.dot
@@ -0,0 +1,52 @@
+digraph {
+	rankdir=BT
+	N0 [label="Hospice Care for Animals" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N1 [label="Pet Check_up" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N2 [label="Herd Health Programs" color="#5C6BC0" fillcolor="#E8EAF6" shape=diamond style=filled]
+	N3 [label="Pharmacy Management" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N4 [label=Surgery color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N5 [label="Medical Record Keeping" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N6 [label="Behavioral Counseling" color="#5C6BC0" fillcolor="#E8EAF6" shape=folder style=filled]
+	N7 [label="Euthanasia Services" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N8 [label="Veterinary Technology Training" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N9 [label="Toxicology Testing" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N10 [label="Post_operative Care" color="#61CAC3" fillcolor="#C2E8E6" shape=plaintext style=filled]
+	N11 [label="Allergy Testing" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Veterinary Pathology" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Genetic Counseling for Animals" color="#4DB6AC" fillcolor="#E0F2F1" shape=octagon style=filled]
+		nest0_1 [label="Parasite Control" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=stitches color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=consults color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=anesthetizes color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=recommends color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [label=admits color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [label=rescues color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N8 -> S1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> M1 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N11 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_137.txt b/test/graphviz/scanned_hard/graphviz_137.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9113247ada8bc7ace6428ec644c609603ca2ea9d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_137.txt
@@ -0,0 +1,24 @@
+<Behavioral Counseling, connectedTo, Euthanasia Services>
+<Euthanasia Services, connectedTo, Allergy Testing>
+<Euthanasia Services, connectedTo, Veterinary Technology Training>
+<Genetic Counseling for Animals, connectedTo, Parasite Control>
+<Genetic Counseling for Animals, partOf, Genetic Counseling for Animals>
+<Herd Health Programs, connectedTo, Pharmacy Management>
+<Hospice Care for Animals, connectedTo, Allergy Testing>
+<Hospice Care for Animals, stitches, Pet Check_up>
+<Medical Record Keeping, connectedTo, Behavioral Counseling>
+<Parasite Control, connectedTo, Toxicology Testing>
+<Parasite Control, partOf, Parasite Control>
+<Pet Check_up, consults, Herd Health Programs>
+<Pharmacy Management, anesthetizes, Surgery>
+<Pharmacy Management, connectedTo, Allergy Testing>
+<Pharmacy Management, connectedTo, Behavioral Counseling>
+<Pharmacy Management, rescues, Medical Record Keeping>
+<Post_operative Care, connectedTo, Allergy Testing>
+<Surgery, recommends, Medical Record Keeping>
+<Toxicology Testing, connectedTo, Allergy Testing>
+<Toxicology Testing, connectedTo, Post_operative Care>
+<Veterinary Technology Training, admits, Genetic Counseling for Animals>
+<Veterinary Technology Training, connectedTo, Allergy Testing>
+<Veterinary Technology Training, connectedTo, Post_operative Care>
+<Veterinary Technology Training, connectedTo, Toxicology Testing>
diff --git a/test/graphviz/scanned_hard/graphviz_138.dot b/test/graphviz/scanned_hard/graphviz_138.dot
new file mode 100644
index 0000000000000000000000000000000000000000..33cf966f6322a42ee4ead4fb6c5902bcb8cf4ed6
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_138.dot
@@ -0,0 +1,35 @@
+digraph {
+	rankdir=TD
+	N0 [label="Wildlife Rehabilitation" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N1 [label=Diagnosis color="#90A4AE" fillcolor="#ECEFF1" shape=plaintext style=filled]
+	N2 [label="Hospice Care for Animals" color="#FFDA4E" fillcolor="#FFE88D" shape=diamond style=filled]
+	N3 [label="Livestock Disease Prevention" color="#C0CA33" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N4 [label="Nutritional Counseling" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N5 [label="Spay or Neuter Procedure" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N6 [label="Medical Record Keeping" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N7 [label="Veterinary Pathology" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Anesthesia Administration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Animal Sheltering Consultation" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+		nest0_1 [label="Behavioral Counseling" color="#C0CA33" fillcolor="#F9FBE7" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=monitors color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=regulates color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=recommends color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N4 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N0 -> S1 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [label=sedates color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [label=performs color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_139.txt b/test/graphviz/scanned_hard/graphviz_139.txt
new file mode 100644
index 0000000000000000000000000000000000000000..11e751cc166cb8e5bbca7c119d2d8ffb5694c0de
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_139.txt
@@ -0,0 +1,19 @@
+<After_School Programs, connectedTo, Nap Time Supervision>
+<Behavior Management, connectedTo, Group Activities Coordination>
+<Behavior Management, connectedTo, Motor Skill Development>
+<Child Protection Policies, organizes, Individualized Attention>
+<Early Literacy Programs, connectedTo, Motor Skill Development>
+<Early Literacy Programs, connectedTo, Teacher_Child Ratio Management>
+<Enrollment and Admissions, creates, Behavior Management>
+<Group Activities Coordination, connectedTo, Child Protection Policies>
+<Motor Skill Development, partOf, Motor Skill Development>
+<Motor Skill Development, reports, Safety Supervision>
+<Nap Time Supervision, connectedTo, Special Needs Accommodation>
+<Nutritional Meal Preparation, connectedTo, Early Literacy Programs>
+<Nutritional Meal Preparation, teaches, Special Needs Accommodation>
+<Safety Supervision, partOf, Safety Supervision>
+<Safety Supervision, protects, Enrollment and Admissions>
+<Special Needs Accommodation, connectedTo, Enrollment and Admissions>
+<Special Needs Accommodation, plays with, Child Protection Policies>
+<Teacher_Child Ratio Management, connectedTo, After_School Programs>
+<Teacher_Child Ratio Management, connectedTo, Special Needs Accommodation>
diff --git a/test/graphviz/scanned_hard/graphviz_140.txt b/test/graphviz/scanned_hard/graphviz_140.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c7028109bd2bf36753f61f4537791fb0abbb39de
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_140.txt
@@ -0,0 +1,18 @@
+<Behavior Management, communicates, Parent_Teacher Conferences>
+<Behavior Management, supervises, Nutritional Meal Preparation>
+<Creative Arts Activities, enrolls, Teacher_Child Ratio Management>
+<Diaper Changing, safeguards, Nutritional Meal Preparation>
+<Nutritional Meal Preparation, connectedTo, Diaper Changing>
+<Nutritional Meal Preparation, connectedTo, Sensory Play>
+<Nutritional Meal Preparation, connectedTo, Staff Training and Certification>
+<Outdoor Exploration, complies, Staff Training and Certification>
+<Outdoor Exploration, connectedTo, Behavior Management>
+<Outdoor Exploration, connectedTo, Story Time Reading>
+<Parent_Teacher Conferences, connectedTo, Child Protection Policies>
+<Parent_Teacher Conferences, connectedTo, Diaper Changing>
+<Sensory Play, connectedTo, Outdoor Exploration>
+<Staff Training and Certification, connectedTo, Diaper Changing>
+<Staff Training and Certification, partOf, Staff Training and Certification>
+<Story Time Reading, connectedTo, Staff Training and Certification>
+<Story Time Reading, partOf, Story Time Reading>
+<Teacher_Child Ratio Management, connectedTo, Diaper Changing>
diff --git a/test/graphviz/scanned_hard/graphviz_143.dot b/test/graphviz/scanned_hard/graphviz_143.dot
new file mode 100644
index 0000000000000000000000000000000000000000..869a25819aad7801093c9e9c8246c181105cea3d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_143.dot
@@ -0,0 +1,36 @@
+digraph {
+	rankdir=TD
+	N0 [label="Mobility Support" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N1 [label="Memory Care" color="#90A4AE" fillcolor="#ECEFF1" shape=folder style=filled]
+	N2 [label="Emergency Response System Monitoring" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N3 [label="Dementia Care" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N4 [label="Medication Management" color="#A188DB" fillcolor="#DED7F0" shape=Mdiamond style=filled]
+	N5 [label="Telehealth for Seniors" color="#A1887F" fillcolor="#EFEBE9" shape=plaintext style=filled]
+	N6 [label="Family Communication" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N7 [label="Speech Therapy" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Hospice Care Coordination" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Occupational Therapy" color="#A188DB" fillcolor="#DED7F0" shape=folder style=filled]
+		nest0_1 [label="Emotional Support and Counseling" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest0_2 [label="Palliative Care" color="#90A4AE" fillcolor="#ECEFF1" shape=folder style=filled]
+		nest0_3 [label="Rehabilitation Support" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [label=facilitates color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=administers color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=dresses color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N1 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [label=educates color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [label=engages color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N6 [label=escorts color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_143.txt b/test/graphviz/scanned_hard/graphviz_143.txt
new file mode 100644
index 0000000000000000000000000000000000000000..daf8f21eee4be30440b3700edbcebd6c93254df8
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_143.txt
@@ -0,0 +1,19 @@
+<Dementia Care, connectedTo, Medication Management>
+<Emergency Response System Monitoring, connectedTo, Dementia Care>
+<Emergency Response System Monitoring, connectedTo, Occupational Therapy>
+<Emotional Support and Counseling, connectedTo, Palliative Care>
+<Emotional Support and Counseling, partOf, Emotional Support and Counseling>
+<Family Communication, dresses, Speech Therapy>
+<Medication Management, connectedTo, Telehealth for Seniors>
+<Medication Management, educates, Family Communication>
+<Medication Management, engages, Speech Therapy>
+<Memory Care, connectedTo, Emergency Response System Monitoring>
+<Mobility Support, administers, Memory Care>
+<Occupational Therapy, facilitates, Emotional Support and Counseling>
+<Occupational Therapy, partOf, Occupational Therapy>
+<Palliative Care, connectedTo, Rehabilitation Support>
+<Palliative Care, escorts, Family Communication>
+<Palliative Care, partOf, Palliative Care>
+<Rehabilitation Support, connectedTo, Memory Care>
+<Rehabilitation Support, partOf, Rehabilitation Support>
+<Telehealth for Seniors, connectedTo, Family Communication>
diff --git a/test/graphviz/scanned_hard/graphviz_146.dot b/test/graphviz/scanned_hard/graphviz_146.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3e9b511f44d66b7d277a92ccd906507753f1517c
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_146.dot
@@ -0,0 +1,58 @@
+digraph {
+	rankdir=LR
+	N0 [label="Capacity Building for Local Communities" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Damage Assessment" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N2 [label="Psychosocial Support" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N3 [label="Risk Assessment" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N4 [label="Public Awareness Campaigns" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+	N5 [label="Drone Deployment for Assessment" color="#FFEB3B" fillcolor="#FFF9C4" shape=folder style=filled]
+	N6 [label="Search and Rescue Operations" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N7 [label="Medical Aid Deployment" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N8 [label="Debris Management" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N9 [label="Geographic Information Systems for Disasters" color="#FFD54F" fillcolor="#FFF8E1" shape=Mdiamond style=filled]
+	N10 [label="Environmental Remediation" color="#FFEB3B" fillcolor="#FFF9C4" shape=octagon style=filled]
+	N11 [label="Volunteer Coordination" color="#FFEB3B" fillcolor="#FFF9C4" shape=parallelogram style=filled]
+	N12 [label="Vulnerability Analysis" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	S0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label=Reconstruction labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Evacuation Procedures" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+		nest0_1 [label="Hazard Mapping" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+		nest0_2 [label="Policy and Legislation Review" color="#FFD54F" fillcolor="#FFF8E1" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=supports color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=assesses color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=shelters color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N11 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [label=recovers color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [label=restores color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [label=provides color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [label=reports color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N3 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label=mobilizes color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [label=identifies color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [label=plans color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_146.txt b/test/graphviz/scanned_hard/graphviz_146.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7558dccb4ac4e371d12e05d35bb43e34d0f5ae79
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_146.txt
@@ -0,0 +1,30 @@
+<Capacity Building for Local Communities, connectedTo, Damage Assessment>
+<Damage Assessment, connectedTo, Psychosocial Support>
+<Damage Assessment, connectedTo, Risk Assessment>
+<Damage Assessment, provides, Debris Management>
+<Damage Assessment, reports, Vulnerability Analysis>
+<Debris Management, connectedTo, Geographic Information Systems for Disasters>
+<Drone Deployment for Assessment, connectedTo, Search and Rescue Operations>
+<Environmental Remediation, connectedTo, Volunteer Coordination>
+<Evacuation Procedures, connectedTo, Hazard Mapping>
+<Evacuation Procedures, partOf, Evacuation Procedures>
+<Geographic Information Systems for Disasters, shelters, Environmental Remediation>
+<Hazard Mapping, connectedTo, Policy and Legislation Review>
+<Hazard Mapping, partOf, Hazard Mapping>
+<Medical Aid Deployment, assesses, Debris Management>
+<Policy and Legislation Review, connectedTo, Volunteer Coordination>
+<Policy and Legislation Review, partOf, Policy and Legislation Review>
+<Psychosocial Support, connectedTo, Risk Assessment>
+<Public Awareness Campaigns, connectedTo, Debris Management>
+<Public Awareness Campaigns, connectedTo, Drone Deployment for Assessment>
+<Public Awareness Campaigns, plans, Debris Management>
+<Risk Assessment, connectedTo, Public Awareness Campaigns>
+<Risk Assessment, connectedTo, Search and Rescue Operations>
+<Risk Assessment, mobilizes, Debris Management>
+<Risk Assessment, recovers, Volunteer Coordination>
+<Risk Assessment, restores, Environmental Remediation>
+<Search and Rescue Operations, connectedTo, Debris Management>
+<Search and Rescue Operations, identifies, Debris Management>
+<Search and Rescue Operations, supports, Medical Aid Deployment>
+<Volunteer Coordination, connectedTo, Evacuation Procedures>
+<Volunteer Coordination, connectedTo, Vulnerability Analysis>
diff --git a/test/graphviz/scanned_hard/graphviz_147.txt b/test/graphviz/scanned_hard/graphviz_147.txt
new file mode 100644
index 0000000000000000000000000000000000000000..14721bd384e5d492712aab25087bae65364417bd
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_147.txt
@@ -0,0 +1,17 @@
+<Emergency Drills and Exercises, connectedTo, Mitigation Strategies>
+<Emergency Response, connectedTo, Emergency Drills and Exercises>
+<Emergency Response, connectedTo, Mitigation Strategies>
+<Emergency Response, connectedTo, Public Awareness Campaigns>
+<Information Dissemination, connectedTo, Satellite Imagery Analysis>
+<Information Dissemination, partOf, Information Dissemination>
+<Public Awareness Campaigns, recovers, Emergency Drills and Exercises>
+<Reconstruction, audits, Resource Mobilization>
+<Reconstruction, partOf, Reconstruction>
+<Resource Mobilization, connectedTo, Emergency Drills and Exercises>
+<Resource Mobilization, connectedTo, Search and Rescue Operations>
+<Resource Mobilization, donates, Mitigation Strategies>
+<Satellite Imagery Analysis, connectedTo, Reconstruction>
+<Satellite Imagery Analysis, partOf, Satellite Imagery Analysis>
+<Search and Rescue Operations, connectedTo, Emergency Response>
+<Search and Rescue Operations, connectedTo, Information Dissemination>
+<Vulnerability Analysis, connectedTo, Resource Mobilization>
diff --git a/test/graphviz/scanned_hard/graphviz_150.dot b/test/graphviz/scanned_hard/graphviz_150.dot
new file mode 100644
index 0000000000000000000000000000000000000000..bea8f02a1237ac631c358df05648efe071423662
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_150.dot
@@ -0,0 +1,52 @@
+digraph {
+	rankdir=RL
+	N0 [label="Cyber Warfare Operations" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N1 [label="Equipment Maintenance" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N2 [label="Personnel Management" color="#FFC107" fillcolor="#FFECB3" shape=diamond style=filled]
+	N3 [label="Electronic Warfare" color="#FFC107" fillcolor="#FFECB3" shape=oval style=filled]
+	N4 [label="Defense Procurement" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	N5 [label="Military Strategy Development" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N6 [label="Air Operations" color="#FFC107" fillcolor="#FFECB3" shape=plaintext style=filled]
+	N7 [label="Naval Operations" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N8 [label=Surveillance color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N9 [label="Weapon Systems Development" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N10 [label="Unmanned Systems Operation" color="#A1D7CD" fillcolor="#EDF5F3" shape=folder style=filled]
+	N11 [label="Crisis Management" color="#A1D7CD" fillcolor="#EDF5F3" shape=parallelogram style=filled]
+	N12 [label="Civil_Military Cooperation" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	S0 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Intelligence Gathering" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Operations Planning" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest0_1 [label="Specialized Training" color="#E57373" fillcolor="#FFEBEE" shape=Mdiamond style=filled]
+		nest0_2 [label="Space Operations" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=intelligence color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=negotiates color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=innovates color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=tests color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label=supplies color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [label=surveys color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N10 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=reports color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [label=analyzes color="#E57373" dir=forward penwidth=1.5 style=solid]
+	M1 -> N11 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_150.txt b/test/graphviz/scanned_hard/graphviz_150.txt
new file mode 100644
index 0000000000000000000000000000000000000000..da5142dc81c5a4a398427235f17a6d31d5e38b65
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_150.txt
@@ -0,0 +1,26 @@
+<Air Operations, connectedTo, Naval Operations>
+<Crisis Management, supplies, Civil_Military Cooperation>
+<Cyber Warfare Operations, connectedTo, Equipment Maintenance>
+<Cyber Warfare Operations, reports, Air Operations>
+<Defense Procurement, analyzes, Crisis Management>
+<Defense Procurement, connectedTo, Air Operations>
+<Defense Procurement, connectedTo, Crisis Management>
+<Defense Procurement, connectedTo, Military Strategy Development>
+<Electronic Warfare, connectedTo, Defense Procurement>
+<Electronic Warfare, surveys, Operations Planning>
+<Equipment Maintenance, connectedTo, Air Operations>
+<Equipment Maintenance, connectedTo, Personnel Management>
+<Military Strategy Development, negotiates, Air Operations>
+<Naval Operations, connectedTo, Crisis Management>
+<Naval Operations, innovates, Surveillance>
+<Operations Planning, connectedTo, Specialized Training>
+<Operations Planning, partOf, Operations Planning>
+<Personnel Management, connectedTo, Air Operations>
+<Personnel Management, intelligence, Electronic Warfare>
+<Space Operations, connectedTo, Unmanned Systems Operation>
+<Space Operations, partOf, Space Operations>
+<Specialized Training, connectedTo, Space Operations>
+<Specialized Training, partOf, Specialized Training>
+<Surveillance, connectedTo, Weapon Systems Development>
+<Unmanned Systems Operation, tests, Crisis Management>
+<Weapon Systems Development, connectedTo, Unmanned Systems Operation>
diff --git a/test/graphviz/scanned_hard/graphviz_151.txt b/test/graphviz/scanned_hard/graphviz_151.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ce603c310d3898b4068e8d7cd60bb2c46547db83
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_151.txt
@@ -0,0 +1,26 @@
+<Aerospace Engineering, connectedTo, Gate Assignment>
+<Airport Operations, connectedTo, Runway Management>
+<Airspace Management, connectedTo, In_flight Service>
+<Airspace Management, partOf, Airspace Management>
+<Emergency Procedures Training, documents, Delay Management>
+<Emergency Procedures Training, regulates, Passenger Check_in>
+<Flight Planning, connectedTo, Delay Management>
+<Fueling Operations, connectedTo, Route Optimization>
+<Gate Assignment, connectedTo, Airport Operations>
+<Gate Assignment, connectedTo, Security Screening>
+<In_flight Service, connectedTo, Weather Briefing>
+<In_flight Service, partOf, In_flight Service>
+<Passenger Check_in, connectedTo, Airport Operations>
+<Passenger Check_in, connectedTo, Delay Management>
+<Passenger Check_in, connectedTo, Fueling Operations>
+<Passenger Check_in, connectedTo, Route Optimization>
+<Passenger Check_in, connectedTo, Sustainable Aviation Fuel Development>
+<Pilot Training, repairs, Delay Management>
+<Pilot Training, tests, Aerospace Engineering>
+<Route Optimization, checks, Airport Operations>
+<Runway Management, certifies, Flight Planning>
+<Security Screening, connectedTo, Emergency Procedures Training>
+<Sustainable Aviation Fuel Development, connectedTo, Airspace Management>
+<Sustainable Aviation Fuel Development, partOf, Sustainable Aviation Fuel Development>
+<Weather Briefing, connectedTo, Fueling Operations>
+<Weather Briefing, partOf, Weather Briefing>
diff --git a/test/graphviz/scanned_hard/graphviz_152.txt b/test/graphviz/scanned_hard/graphviz_152.txt
new file mode 100644
index 0000000000000000000000000000000000000000..11a044ce65a06be06a5eb86f28ddc1f66dd33816
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_152.txt
@@ -0,0 +1,26 @@
+<Air Traffic Control, connectedTo, Navigation System Check>
+<Air Traffic Control, partOf, Air Traffic Control>
+<Aircraft De_icing, connectedTo, Fueling Operations>
+<Aircraft De_icing, connectedTo, Next_Generation Air Traffic Management>
+<Airport Operations, connectedTo, Aircraft De_icing>
+<Airport Operations, connectedTo, Next_Generation Air Traffic Management>
+<Crew Resource Management, connectedTo, Security Screening>
+<Engine Overhaul, connectedTo, Aircraft De_icing>
+<Engine Overhaul, partOf, Engine Overhaul>
+<Fueling Operations, connectedTo, Ground Support>
+<Fueling Operations, connectedTo, Next_Generation Air Traffic Management>
+<Fueling Operations, lands, Next_Generation Air Traffic Management>
+<Gate Assignment, boards, Engine Overhaul>
+<Gate Assignment, partOf, Gate Assignment>
+<Ground Support, connectedTo, Next_Generation Air Traffic Management>
+<Ground Support, loads, Air Traffic Control>
+<In_flight Service, regulates, Crew Resource Management>
+<Navigation System Check, designs, Gate Assignment>
+<Navigation System Check, partOf, Navigation System Check>
+<Next_Generation Air Traffic Management, inspects, Sustainable Aviation Fuel Development>
+<Passenger Check_in, connectedTo, Runway Management>
+<Runway Management, investigates, In_flight Service>
+<Security Screening, connectedTo, Emergency Procedures Training>
+<Sustainable Aviation Fuel Development, audits, Runway Management>
+<Sustainable Aviation Fuel Development, connectedTo, Passenger Check_in>
+<Sustainable Aviation Fuel Development, connectedTo, Security Screening>
diff --git a/test/graphviz/scanned_hard/graphviz_153.dot b/test/graphviz/scanned_hard/graphviz_153.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8a28aa40b70233d31fabc0dca413a50a0b56ed62
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_153.dot
@@ -0,0 +1,39 @@
+digraph {
+	rankdir=TD
+	N0 [label="Route Optimization" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N1 [label="Next_Generation Air Traffic Management" color="#73C6BC" fillcolor="#D0EFEE" shape=diamond style=filled]
+	N2 [label="Emergency Procedures Training" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N3 [label="Aviation Safety Investigation" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N4 [label="Remote Tower Operations" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N5 [label="Aircraft Manufacturing" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N6 [label="Flight Simulation" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Noise Abatement Procedures" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Aircraft De_icing" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+		nest0_1 [label="Sustainable Aviation Fuel Development" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+		nest0_2 [label="Fleet Management" color="#73C6BC" fillcolor="#D0EFEE" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=flies color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=reports color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=unloads color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [label=boards color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [label=maintains color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_154.dot b/test/graphviz/scanned_hard/graphviz_154.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e2e4c5c15c47fb86b70d91d77f2406c8837a38fc
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_154.dot
@@ -0,0 +1,39 @@
+digraph {
+	rankdir=BT
+	N0 [label="GPS Positioning" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label=Geocoding color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N2 [label="Voice Guidance Customization" color="#FFC2C2" fillcolor="#FFEBEB" shape=folder style=filled]
+	N3 [label="Terrestrial Navigation" color="#EAEFA5" fillcolor="#FDFCEB" shape=Mdiamond style=filled]
+	N4 [label="Turn_by_Turn Directions" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N5 [label="Lane Guidance" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Satellite Navigation Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Real_Time Re_routing" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest0_1 [label="Historical Traffic Data Analysis" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest0_2 [label="Multi_modal Navigation" color="#FFC2C2" fillcolor="#FFEBEB" shape=parallelogram style=filled]
+		nest0_3 [label="Location_Based Services" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [label=predicts color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [label=syncs color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=identifies color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=plots color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N4 [label=alerts color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [label=searches color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [label=transmits color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_155.dot b/test/graphviz/scanned_hard/graphviz_155.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7caa0e6332eecffe7bd13d1ee2b6f96281d022b7
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_155.dot
@@ -0,0 +1,43 @@
+digraph {
+	rankdir=RL
+	N0 [label="Turn_by_Turn Directions" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N1 [label="Altitude Tracking" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N2 [label="Map Display" color="#E0E0E0" fillcolor="#EBEBEB" shape=Mdiamond style=filled]
+	N3 [label="Personalized Route Preferences" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N4 [label="Points of Interest Search" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+	N5 [label="Reverse Geocoding" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N6 [label="Hazard Alerts" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N7 [label="Public Transit Navigation" color="#E57373" fillcolor="#FFEBEE" shape=Mdiamond style=filled]
+	N8 [label="Aeronautical Charting" color="#E57373" fillcolor="#FFEBEE" shape=folder style=filled]
+	N9 [label="Augmented Reality Navigation" color="#E0E0E0" fillcolor="#EBEBEB" shape=oval style=filled]
+	N10 [label="Offline Map Support" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	S0 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Autonomous Vehicle Navigation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Speed Calculation" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+		nest0_1 [label="Real_Time Re_routing" color="#E57373" fillcolor="#FFEBEE" shape=folder style=filled]
+		nest0_2 [label="Digital Compass Integration" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=monitors color="#795548" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=syncs color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [label=tracks color="#795548" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N5 [label=predicts color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [label=updates color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_156.txt b/test/graphviz/scanned_hard/graphviz_156.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9a8939506277b190588979a3677d7be12d30b0ad
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_156.txt
@@ -0,0 +1,23 @@
+<Aeronautical Charting, connectedTo, Multi_modal Navigation>
+<Bearing and Distance Calculation, connectedTo, Aeronautical Charting>
+<Bearing and Distance Calculation, connectedTo, Personalized Route Preferences>
+<Geofencing, connectedTo, Bearing and Distance Calculation>
+<Geofencing, orients, Real_Time Re_routing>
+<Inertial Navigation System, connectedTo, Reverse Geocoding>
+<Inertial Navigation System, partOf, Inertial Navigation System>
+<Lane Guidance, partOf, Lane Guidance>
+<Lane Guidance, plots, Satellite Navigation Systems>
+<Map Display, connectedTo, Bearing and Distance Calculation>
+<Offline Map Support, connectedTo, Aeronautical Charting>
+<Pedestrian Navigation, connectedTo, Map Display>
+<Personalized Route Preferences, validates, Terrestrial Navigation>
+<Real_Time Re_routing, connectedTo, Aeronautical Charting>
+<Real_Time Re_routing, detects, Reverse Geocoding>
+<Reverse Geocoding, avoids, Pedestrian Navigation>
+<Reverse Geocoding, connectedTo, Bearing and Distance Calculation>
+<Reverse Geocoding, connectedTo, Multi_modal Navigation>
+<Reverse Geocoding, connectedTo, Terrestrial Navigation>
+<Reverse Geocoding, plans, Lane Guidance>
+<Satellite Navigation Systems, connectedTo, Inertial Navigation System>
+<Satellite Navigation Systems, partOf, Satellite Navigation Systems>
+<Terrestrial Navigation, connectedTo, Offline Map Support>
diff --git a/test/graphviz/scanned_hard/graphviz_157.dot b/test/graphviz/scanned_hard/graphviz_157.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e85b716b12b5d4e4009d298348eacc709a96de48
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_157.dot
@@ -0,0 +1,47 @@
+digraph {
+	rankdir=BT
+	N0 [label="Mass Customization" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N1 [label="Printing Parameter Optimization" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N2 [label=Bioprinting color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N3 [label="Consumer Product Creation" color="#AED581" fillcolor="#F0F4C3" shape=plaintext style=filled]
+	N4 [label="Medical Device Prototyping" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N5 [label="File Format Conversion" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N6 [label="3D Printed Tooling" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N7 [label="Multi_Material Printing" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N8 [label="Slicing Software Operation" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N9 [label=Post_Processing color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	S0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="On_Demand Production" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Distributed Manufacturing" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+		nest0_1 [label="Digital Twin for 3D Prints" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+		nest0_2 [label="Reverse Engineering with 3D Printing" color="#FFC107" fillcolor="#FFECB3" shape=diamond style=filled]
+		nest0_3 [label="Support Structure Design" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=develops color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=models color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=controls color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=produces color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_157.txt b/test/graphviz/scanned_hard/graphviz_157.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ce695414eafc726a5b171bce041d0d246d2109d2
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_157.txt
@@ -0,0 +1,24 @@
+<3D Printed Tooling, connectedTo, Multi_Material Printing>
+<Bioprinting, models, Consumer Product Creation>
+<Consumer Product Creation, connectedTo, Multi_Material Printing>
+<Consumer Product Creation, controls, Medical Device Prototyping>
+<Digital Twin for 3D Prints, connectedTo, Reverse Engineering with 3D Printing>
+<Digital Twin for 3D Prints, partOf, Digital Twin for 3D Prints>
+<Distributed Manufacturing, connectedTo, Digital Twin for 3D Prints>
+<Distributed Manufacturing, partOf, Distributed Manufacturing>
+<File Format Conversion, produces, 3D Printed Tooling>
+<Mass Customization, connectedTo, Consumer Product Creation>
+<Mass Customization, connectedTo, File Format Conversion>
+<Mass Customization, connectedTo, Multi_Material Printing>
+<Mass Customization, connectedTo, Post_Processing>
+<Mass Customization, connectedTo, Printing Parameter Optimization>
+<Medical Device Prototyping, connectedTo, File Format Conversion>
+<Medical Device Prototyping, connectedTo, Multi_Material Printing>
+<Multi_Material Printing, connectedTo, Distributed Manufacturing>
+<Multi_Material Printing, connectedTo, Slicing Software Operation>
+<Printing Parameter Optimization, develops, Bioprinting>
+<Reverse Engineering with 3D Printing, connectedTo, Support Structure Design>
+<Reverse Engineering with 3D Printing, partOf, Reverse Engineering with 3D Printing>
+<Slicing Software Operation, connectedTo, Post_Processing>
+<Support Structure Design, connectedTo, Bioprinting>
+<Support Structure Design, partOf, Support Structure Design>
diff --git a/test/graphviz/scanned_hard/graphviz_159.dot b/test/graphviz/scanned_hard/graphviz_159.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4df9597cb2d33a4c5f08d0b7f648aa9ed8d52b43
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_159.dot
@@ -0,0 +1,39 @@
+digraph {
+	rankdir=LR
+	N0 [label="Mass Customization" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N1 [label=Post_Processing color="#B8C0F5" fillcolor="#ECF0FD" shape=Mdiamond style=filled]
+	N2 [label="Educational Applications" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N3 [label="Custom Part Production" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N4 [label=Bioprinting color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N5 [label="Support Structure Design" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	S0 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="On_Demand Production" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="3D Model Design" color="#BA68C8" fillcolor="#F3E5F5" shape=oval style=filled]
+		nest0_1 [label="Troubleshooting Print Errors" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+		nest0_2 [label="Digital Twin for 3D Prints" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+		nest0_3 [label="Slicing Software Operation" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=analyzes color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=scans color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [label=engineers color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N2 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [label=replicates color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [label=integrates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_160.dot b/test/graphviz/scanned_hard/graphviz_160.dot
new file mode 100644
index 0000000000000000000000000000000000000000..adec429657b8b81bdd59576f9c0767a29f5f6617
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_160.dot
@@ -0,0 +1,39 @@
+digraph {
+	rankdir=RL
+	N0 [label="Carbon Nanotube Synthesis" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N1 [label="Advanced Materials Research" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N2 [label="Ethical Implications of Nanotech" color="#FFE470" fillcolor="#FFFAE0" shape=oval style=filled]
+	N3 [label="Water Purification using Nanomaterials" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	N4 [label="Energy Storage Applications" color="#A188DB" fillcolor="#DED7F0" shape=plaintext style=filled]
+	N5 [label="Computational Nanotechnology" color="#90A4AE" fillcolor="#ECEFF1" shape=folder style=filled]
+	N6 [label="Quantum Computing Integration" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+	N7 [label="X_ray Diffraction" color="#A188DB" fillcolor="#DED7F0" shape=Mdiamond style=filled]
+	N8 [label="Food Packaging Improvement" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	S0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label=Nanotoxicology labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Nanodevice Fabrication" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+		nest0_1 [label="Nanoparticle Characterization" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=engineers color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=modifies color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=measures color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [label=secures color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N2 [label=develops color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [label=optimizes color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_162.txt b/test/graphviz/scanned_hard/graphviz_162.txt
new file mode 100644
index 0000000000000000000000000000000000000000..01a5904f416617da94047868440ec831808ce582
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_162.txt
@@ -0,0 +1,26 @@
+<Biosensors, connectedTo, Nanomaterial Synthesis>
+<Biosensors, partOf, Biosensors>
+<Computational Nanotechnology, assembles, Nanocomposites>
+<Computational Nanotechnology, connectedTo, Surface Functionalization>
+<Drug Delivery Systems, connectedTo, Computational Nanotechnology>
+<Drug Delivery Systems, connectedTo, Food Packaging Improvement>
+<Drug Delivery Systems, connectedTo, Photovoltaics>
+<Environmental Remediation with Nanomaterials, connectedTo, Molecular Self_Assembly>
+<Food Packaging Improvement, connectedTo, Nanoparticle Characterization>
+<Molecular Self_Assembly, connectedTo, Ethical Implications of Nanotech>
+<Nanocoatings, connectedTo, Photovoltaics>
+<Nanocomposites, connectedTo, Biosensors>
+<Nanocomposites, partOf, Nanocomposites>
+<Nanodevice Fabrication, connectedTo, Photovoltaics>
+<Nanodevice Fabrication, partOf, Nanodevice Fabrication>
+<Nanoelectronics, connectedTo, Nanocoatings>
+<Nanomaterial Synthesis, connectedTo, Nanodevice Fabrication>
+<Nanomaterial Synthesis, partOf, Nanomaterial Synthesis>
+<Nanoparticle Characterization, connectedTo, Molecular Self_Assembly>
+<Nanoparticle Characterization, filters, Nanoelectronics>
+<Nanoparticle Characterization, monitors, Photovoltaics>
+<Nanoscale Imaging, connectedTo, Ethical Implications of Nanotech>
+<Nanoscale Imaging, detects, Food Packaging Improvement>
+<Photovoltaics, connectedTo, Ethical Implications of Nanotech>
+<Photovoltaics, modifies, Environmental Remediation with Nanomaterials>
+<Surface Functionalization, connectedTo, Nanoscale Imaging>
diff --git a/test/graphviz/scanned_hard/graphviz_163.dot b/test/graphviz/scanned_hard/graphviz_163.dot
new file mode 100644
index 0000000000000000000000000000000000000000..81a8a10159dc6d1e5810d54b205caaa54b41f70d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_163.dot
@@ -0,0 +1,41 @@
+digraph {
+	rankdir=BT
+	N0 [label="Quantum Sensing" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N1 [label="Financial Modeling with Quantum Computing" color="#FFEB3B" fillcolor="#FFF9C4" shape=oval style=filled]
+	N2 [label="Quantum Network Development" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N3 [label="Quantum Teleportation Research" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N4 [label="Quantum Algorithm Development" color="#00BCD4" fillcolor="#E0F7FA" shape=folder style=filled]
+	N5 [label="Quantum Coherence Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N6 [label="Quantum Communication Protocols" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N7 [label="Quantum Cloud Computing Services" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N8 [label="Quantum Programming Languages" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N9 [label="Quantum Machine Learning" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N10 [label="Optimization Problems with Quantum Annealing" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Quantum Simulation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Quantum Error Correction" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest0_1 [label="Quantum Computing in Drug Discovery" color="#FFEB3B" fillcolor="#FFF9C4" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=downloads color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=controls color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=integrates color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=programs color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [label=processes color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_163.txt b/test/graphviz/scanned_hard/graphviz_163.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e36fd7c7ebd08500a11c2b773485a2c7a56afdfc
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_163.txt
@@ -0,0 +1,19 @@
+<Financial Modeling with Quantum Computing, connectedTo, Quantum Network Development>
+<Quantum Algorithm Development, connectedTo, Quantum Coherence Management>
+<Quantum Algorithm Development, connectedTo, Quantum Machine Learning>
+<Quantum Cloud Computing Services, connectedTo, Optimization Problems with Quantum Annealing>
+<Quantum Cloud Computing Services, connectedTo, Quantum Machine Learning>
+<Quantum Cloud Computing Services, integrates, Quantum Programming Languages>
+<Quantum Coherence Management, downloads, Quantum Communication Protocols>
+<Quantum Communication Protocols, controls, Quantum Cloud Computing Services>
+<Quantum Computing in Drug Discovery, connectedTo, Quantum Communication Protocols>
+<Quantum Computing in Drug Discovery, partOf, Quantum Computing in Drug Discovery>
+<Quantum Error Correction, connectedTo, Quantum Computing in Drug Discovery>
+<Quantum Error Correction, partOf, Quantum Error Correction>
+<Quantum Machine Learning, connectedTo, Optimization Problems with Quantum Annealing>
+<Quantum Machine Learning, processes, Quantum Error Correction>
+<Quantum Network Development, connectedTo, Quantum Teleportation Research>
+<Quantum Programming Languages, programs, Quantum Machine Learning>
+<Quantum Sensing, connectedTo, Financial Modeling with Quantum Computing>
+<Quantum Sensing, connectedTo, Quantum Machine Learning>
+<Quantum Teleportation Research, connectedTo, Quantum Algorithm Development>
diff --git a/test/graphviz/scanned_hard/graphviz_165.dot b/test/graphviz/scanned_hard/graphviz_165.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ea4ed2c4683e12d7767ef9db5010141357ed82d1
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_165.dot
@@ -0,0 +1,49 @@
+digraph {
+	rankdir=TD
+	N0 [label="Quantum Communication Protocols" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N1 [label="Decoherence Mitigation" color="#AABEC6" fillcolor="#E0E6E9" shape=oval style=filled]
+	N2 [label="Quantum Entanglement Generation" color="#4FC3F7" fillcolor="#E1F5FE" shape=plaintext style=filled]
+	N3 [label="Quantum Computing for AI" color="#AABEC6" fillcolor="#E0E6E9" shape=folder style=filled]
+	N4 [label="Cryogenic Systems for Qubits" color="#AABEC6" fillcolor="#E0E6E9" shape=oval style=filled]
+	N5 [label="Quantum Bit Design" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N6 [label="Quantum Error Correction" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N7 [label="Quantum Annealing" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N8 [label="Quantum Supremacy Claims" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N9 [label="Quantum Cloud Computing Services" color="#FFC107" fillcolor="#FFECB3" shape=octagon style=filled]
+	N10 [label="Quantum Computing Benchmarking" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N11 [label="Quantum Sensing" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N12 [label="Photonic Qubits" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	S0 [label="" color="#4FC3F7" fillcolor="#E1F5FE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4FC3F7" fillcolor="#E1F5FE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Quantum Processor Fabrication" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Quantum Circuit Design" color="#FFC107" fillcolor="#FFECB3" shape=plaintext style=filled]
+		nest0_1 [label="Material Science Simulations" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=factors color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=integrates color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=secures color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=measures color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [label=manages color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N10 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [label=researches color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [label=programs color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label=validates color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_167.dot b/test/graphviz/scanned_hard/graphviz_167.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fea73efc4517fc16909cb7896cc41e52dc595dd3
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_167.dot
@@ -0,0 +1,47 @@
+digraph {
+	rankdir=BT
+	N0 [label="Gesture Recognition" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N1 [label="User Interface Design" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N2 [label="Hardware Prototyping" color="#9C27B0" fillcolor="#E1BEE7" shape=parallelogram style=filled]
+	N3 [label="Training Simulations" color="#9C27B0" fillcolor="#E1BEE7" shape=octagon style=filled]
+	N4 [label="Neuro_VR Interfaces" color="#FFD54F" fillcolor="#FFF8E1" shape=octagon style=filled]
+	N5 [label="Virtual Showrooms" color="#9C27B0" fillcolor="#E1BEE7" shape=plaintext style=filled]
+	N6 [label="Hand Tracking and Interaction" color="#D2D2D2" fillcolor="#F0F0F0" shape=octagon style=filled]
+	N7 [label="Industrial Maintenance Support" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N8 [label="Ethical Considerations in AR or VR" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	S0 [label="" color="#D2D2D2" fillcolor="#F0F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Augmented Reality App Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Headset Development" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+		nest0_1 [label="Comfort and Ergonomics Design" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+		nest0_2 [label="3D Model Creation" color="#9C27B0" fillcolor="#E1BEE7" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [label=secures color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=personalizes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=collaborates color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=interacts color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [label=connects color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [label=maps color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [label=develops color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_169.dot b/test/graphviz/scanned_hard/graphviz_169.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d020b4a84fa0c3475c43a7d79e2b2fbeb315450b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_169.dot
@@ -0,0 +1,33 @@
+digraph {
+	rankdir=LR
+	N0 [label="Game Performance Optimization" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="AI Behavior Programming" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N2 [label="Sound Design" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+	N3 [label=Programming color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+	N4 [label="PC Game Development" color="#82DAFF" fillcolor="#C8EDFF" shape=parallelogram style=filled]
+	N5 [label="Marketing and Promotion" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N6 [label="User Experience Design" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	S0 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Physics Simulation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="User Interface Design" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_1 [label="Game Design" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest0_2 [label=Localization color="#3F51B5" fillcolor="#C5CAE9" shape=oval style=filled]
+		nest0_0 -> nest0_1 [label=updates color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=sponsors color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=writes color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N1 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [label=renders color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N4 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_169.txt b/test/graphviz/scanned_hard/graphviz_169.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e2b648827c374c5110b9d2398d07aece97a1a187
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_169.txt
@@ -0,0 +1,17 @@
+<AI Behavior Programming, connectedTo, Sound Design>
+<Game Design, partOf, Game Design>
+<Game Design, sponsors, Localization>
+<Game Performance Optimization, connectedTo, Marketing and Promotion>
+<Game Performance Optimization, connectedTo, Sound Design>
+<Game Performance Optimization, renders, Programming>
+<Game Performance Optimization, writes, AI Behavior Programming>
+<Localization, connectedTo, AI Behavior Programming>
+<Localization, connectedTo, PC Game Development>
+<Localization, partOf, Localization>
+<Marketing and Promotion, connectedTo, User Experience Design>
+<PC Game Development, connectedTo, Marketing and Promotion>
+<Programming, connectedTo, PC Game Development>
+<Sound Design, connectedTo, Programming>
+<Sound Design, connectedTo, User Interface Design>
+<User Interface Design, partOf, User Interface Design>
+<User Interface Design, updates, Game Design>
diff --git a/test/graphviz/scanned_hard/graphviz_173.txt b/test/graphviz/scanned_hard/graphviz_173.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d6dcc618818d0f36abb2fd3bb86d991ce841a90c
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_173.txt
@@ -0,0 +1,22 @@
+<Arrangement, connectedTo, Music for Film or TV or Games>
+<Arrangement, partOf, Arrangement>
+<Artist Management, connectedTo, Songwriting>
+<Composition, connectedTo, Music Therapy>
+<Composition, invests, Record Label Operations>
+<Instrumental Performance, connectedTo, Arrangement>
+<Instrumental Performance, partOf, Instrumental Performance>
+<Music Therapy, connectedTo, Ticketing>
+<Music Therapy, connectedTo, Vocal Performance>
+<Music Therapy, generates, Vocal Performance>
+<Music Therapy, learns, Synthesizer Programming>
+<Music Therapy, synthesizes, Record Label Operations>
+<Music for Film or TV or Games, connectedTo, Synthesizer Programming>
+<Music for Film or TV or Games, partOf, Music for Film or TV or Games>
+<Record Label Operations, reviews, Royalty Collection>
+<Royalty Collection, distributes, Vocal Performance>
+<Songwriting, connectedTo, Composition>
+<Songwriting, connectedTo, Record Label Operations>
+<Songwriting, connectedTo, Vocal Performance>
+<Ticketing, connectedTo, Instrumental Performance>
+<Ticketing, partOf, Ticketing>
+<Vocal Performance, connectedTo, Synthesizer Programming>
diff --git a/test/graphviz/scanned_hard/graphviz_174.dot b/test/graphviz/scanned_hard/graphviz_174.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dab9e9885381e41612b28c5877303928777c48b4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_174.dot
@@ -0,0 +1,43 @@
+digraph {
+	rankdir=RL
+	N0 [label="Tour Management" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N1 [label=Sampling color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N2 [label="Music Licensing" color="#BCB88A" fillcolor="#F5F5DC" shape=folder style=filled]
+	N3 [label="Vocal Performance" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N4 [label="Live Sound Engineering" color="#CFCFCF" fillcolor="#F6F6F6" shape=plaintext style=filled]
+	N5 [label=Performance color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N6 [label="Digital Audio Workstation Operation" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N7 [label="Audio Engineering" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N8 [label="A&R" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N9 [label="Copyright Management" color="#795548" fillcolor="#D7CCC8" shape=plaintext style=filled]
+	N10 [label="Music Festival Organization" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Crowdfunding for Music Projects" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Fan Engagement Strategy" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+		nest0_1 [label="Merchandise Sales" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+		nest0_2 [label="Music Theory Analysis" color="#795548" fillcolor="#D7CCC8" shape=oval style=filled]
+		nest0_0 -> nest0_1 [label=publishes color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=funds color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N3 [label=licenses color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [label=trains color="#795548" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_174.txt b/test/graphviz/scanned_hard/graphviz_174.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8ea131f64d928af118cc3dcde8272d12ebb3b185
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_174.txt
@@ -0,0 +1,20 @@
+<A&R, connectedTo, Copyright Management>
+<Audio Engineering, connectedTo, A&R>
+<Copyright Management, connectedTo, Music Festival Organization>
+<Digital Audio Workstation Operation, connectedTo, Audio Engineering>
+<Fan Engagement Strategy, partOf, Fan Engagement Strategy>
+<Fan Engagement Strategy, publishes, Merchandise Sales>
+<Live Sound Engineering, connectedTo, Performance>
+<Merchandise Sales, connectedTo, Music Theory Analysis>
+<Merchandise Sales, partOf, Merchandise Sales>
+<Music Licensing, connectedTo, Vocal Performance>
+<Music Theory Analysis, licenses, Vocal Performance>
+<Music Theory Analysis, partOf, Music Theory Analysis>
+<Performance, connectedTo, Audio Engineering>
+<Performance, connectedTo, Copyright Management>
+<Performance, connectedTo, Digital Audio Workstation Operation>
+<Performance, trains, A&R>
+<Sampling, connectedTo, Fan Engagement Strategy>
+<Sampling, connectedTo, Music Licensing>
+<Tour Management, funds, Sampling>
+<Vocal Performance, connectedTo, Live Sound Engineering>
diff --git a/test/graphviz/scanned_hard/graphviz_175.dot b/test/graphviz/scanned_hard/graphviz_175.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ba2a6a0e97caf9da7eb2b4239774109d56af914a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_175.dot
@@ -0,0 +1,42 @@
+digraph {
+	rankdir=BT
+	N0 [label="Archiving and Preservation" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label="Legal Compliance" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N2 [label="Green Production Practices" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N3 [label="Pre_production Planning" color="#9575CD" fillcolor="#EDE7F6" shape=plaintext style=filled]
+	N4 [label="Distribution Strategy" color="#607D8B" fillcolor="#CFD8DC" shape=diamond style=filled]
+	N5 [label="Location Scouting" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N6 [label="Virtual Production Techniques" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N7 [label="Makeup and Hair Design" color="#9575CD" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N8 [label="Marketing and Publicity" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N9 [label=Storyboarding color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N10 [label="Stunt Coordination" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N11 [label="Film Financing" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	M1 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Production Accounting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Prop Management" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+		nest0_1 [label="Screenwriting Workshops" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=directs color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=screens color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=manages color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=scores color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=coordinates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N3 [label=reviews color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N5 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N5 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N2 -> N10 [label=records color="#9575CD" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_175.txt b/test/graphviz/scanned_hard/graphviz_175.txt
new file mode 100644
index 0000000000000000000000000000000000000000..11f8c7a4c00026f71168c26a53ab7f14888a4ca0
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_175.txt
@@ -0,0 +1,21 @@
+<Archiving and Preservation, connectedTo, Storyboarding>
+<Archiving and Preservation, directs, Legal Compliance>
+<Distribution Strategy, connectedTo, Location Scouting>
+<Distribution Strategy, connectedTo, Storyboarding>
+<Green Production Practices, records, Stunt Coordination>
+<Green Production Practices, screens, Pre_production Planning>
+<Legal Compliance, connectedTo, Green Production Practices>
+<Location Scouting, connectedTo, Virtual Production Techniques>
+<Makeup and Hair Design, scores, Marketing and Publicity>
+<Marketing and Publicity, connectedTo, Storyboarding>
+<Pre_production Planning, connectedTo, Distribution Strategy>
+<Pre_production Planning, connectedTo, Location Scouting>
+<Prop Management, connectedTo, Screenwriting Workshops>
+<Prop Management, partOf, Prop Management>
+<Screenwriting Workshops, connectedTo, Location Scouting>
+<Screenwriting Workshops, partOf, Screenwriting Workshops>
+<Screenwriting Workshops, reviews, Pre_production Planning>
+<Storyboarding, connectedTo, Prop Management>
+<Storyboarding, coordinates, Stunt Coordination>
+<Stunt Coordination, connectedTo, Film Financing>
+<Virtual Production Techniques, manages, Makeup and Hair Design>
diff --git a/test/graphviz/scanned_hard/graphviz_176.dot b/test/graphviz/scanned_hard/graphviz_176.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9ba95599fd1389b95ea1f9478f5a7cf1cf9ae28b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_176.dot
@@ -0,0 +1,40 @@
+digraph {
+	rankdir=TD
+	N0 [label=Casting color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Script Development" color="#FBC02D" fillcolor="#FFFDE7" shape=oval style=filled]
+	N2 [label="Remote Collaboration Tools" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N3 [label="Crew Management" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N4 [label="Green Production Practices" color="#FBC02D" fillcolor="#FFFDE7" shape=oval style=filled]
+	N5 [label="Screenwriting Workshops" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N6 [label="Tax Incentive Management" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N7 [label="Prop Management" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N8 [label="Production Scheduling" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	S0 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Film Financing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Sound Recording" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+		nest0_1 [label=Directing color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_2 [label="Special Effects" color="#64B5F6" fillcolor="#E3F2FD" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [label=secures color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=animates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=scripts color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=films color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=budgets color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [label=publishes color="#81C784" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N2 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_178.dot b/test/graphviz/scanned_hard/graphviz_178.dot
new file mode 100644
index 0000000000000000000000000000000000000000..58422960f5c473688c9f7b4b2556483c4027c741
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_178.dot
@@ -0,0 +1,47 @@
+digraph {
+	rankdir=BT
+	N0 [label="Editing and Proofreading" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N1 [label="Distribution Planning" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N2 [label="Keyword Research" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N3 [label="Blog Post Writing" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N4 [label="Audience Analysis" color="#D2D2D2" fillcolor="#F0F0F0" shape=Mdiamond style=filled]
+	N5 [label="Live Streaming Content" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N6 [label="Content Repurposing" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N7 [label=Animation color="#D2D2D2" fillcolor="#F0F0F0" shape=Mdiamond style=filled]
+	N8 [label="Plagiarism Checking" color="#D2D2D2" fillcolor="#F0F0F0" shape=octagon style=filled]
+	N9 [label=Videography color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N10 [label="Ideation and Brainstorming" color="#D2D2D2" fillcolor="#F0F0F0" shape=octagon style=filled]
+	N11 [label="Content Localization" color="#D2D2D2" fillcolor="#F0F0F0" shape=folder style=filled]
+	N12 [label="Interview Conduct" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N13 [label="Audience Engagement" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	S0 [label="" color="#D2D2D2" fillcolor="#F0F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Drafting Content" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="User_Generated Content Curation" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+		nest0_1 [label=Fact_Checking color="#DCE775" fillcolor="#F9FBE7" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=tracks color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=moderates color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=videos color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=optimizes color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N12 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [label=designs color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N10 -> M0 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label=publishes color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_178.txt b/test/graphviz/scanned_hard/graphviz_178.txt
new file mode 100644
index 0000000000000000000000000000000000000000..29d813f6c30a999f8d923091fa5160f0d29c2085
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_178.txt
@@ -0,0 +1,22 @@
+<Animation, connectedTo, Plagiarism Checking>
+<Audience Analysis, connectedTo, Live Streaming Content>
+<Audience Analysis, connectedTo, User_Generated Content Curation>
+<Blog Post Writing, connectedTo, Audience Analysis>
+<Blog Post Writing, publishes, Audience Engagement>
+<Content Localization, videos, Interview Conduct>
+<Content Repurposing, connectedTo, Plagiarism Checking>
+<Content Repurposing, designs, Interview Conduct>
+<Content Repurposing, tracks, Animation>
+<Distribution Planning, connectedTo, Keyword Research>
+<Editing and Proofreading, connectedTo, Distribution Planning>
+<Fact_Checking, connectedTo, Interview Conduct>
+<Fact_Checking, partOf, Fact_Checking>
+<Ideation and Brainstorming, connectedTo, Audience Engagement>
+<Ideation and Brainstorming, moderates, Content Localization>
+<Interview Conduct, optimizes, Audience Engagement>
+<Keyword Research, connectedTo, Blog Post Writing>
+<Live Streaming Content, connectedTo, Content Repurposing>
+<Plagiarism Checking, connectedTo, Videography>
+<User_Generated Content Curation, connectedTo, Fact_Checking>
+<User_Generated Content Curation, partOf, User_Generated Content Curation>
+<Videography, connectedTo, Ideation and Brainstorming>
diff --git a/test/graphviz/scanned_hard/graphviz_18.dot b/test/graphviz/scanned_hard/graphviz_18.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fc0b93d4497cf52278c4d04318583fdf0c176465
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_18.dot
@@ -0,0 +1,28 @@
+digraph {
+	rankdir=RL
+	N0 [label="Seasonal Sales Planning" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Supply Chain Optimization" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N2 [label="Security Tagging" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N3 [label="Payment Processing" color="#FFF176" fillcolor="#FFFDE7" shape=folder style=filled]
+	N4 [label="E_commerce Platform Integration" color="#FFF176" fillcolor="#FFFDE7" shape=Mdiamond style=filled]
+	N5 [label="Stock Replenishment" color="#D3EB9F" fillcolor="#F8FDD3" shape=diamond style=filled]
+	N6 [label="Product Demonstration" color="#D3EB9F" fillcolor="#F8FDD3" shape=parallelogram style=filled]
+	N7 [label="Curbside Delivery" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N8 [label="Gift Wrapping" color="#FFF176" fillcolor="#FFFDE7" shape=Mdiamond style=filled]
+	N9 [label="Daily Report Generation" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N10 [label="Customer Loyalty Analytics" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N11 [label="Supplier Payment" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N0 -> N1 [label=ships color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=orders color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=scans color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=advertises color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=sells color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=analyzes color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N7 [label=lists color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N0 [label=engages color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_18.txt b/test/graphviz/scanned_hard/graphviz_18.txt
new file mode 100644
index 0000000000000000000000000000000000000000..36aed4001d5b759ce481b13e7dd716668c478f31
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_18.txt
@@ -0,0 +1,13 @@
+<Curbside Delivery, analyzes, Gift Wrapping>
+<Customer Loyalty Analytics, connectedTo, Supplier Payment>
+<Daily Report Generation, connectedTo, Customer Loyalty Analytics>
+<E_commerce Platform Integration, connectedTo, Stock Replenishment>
+<Gift Wrapping, connectedTo, Daily Report Generation>
+<Gift Wrapping, lists, Curbside Delivery>
+<Payment Processing, connectedTo, E_commerce Platform Integration>
+<Product Demonstration, sells, Curbside Delivery>
+<Seasonal Sales Planning, ships, Supply Chain Optimization>
+<Security Tagging, scans, Payment Processing>
+<Stock Replenishment, advertises, Product Demonstration>
+<Supplier Payment, engages, Seasonal Sales Planning>
+<Supply Chain Optimization, orders, Security Tagging>
diff --git a/test/graphviz/scanned_hard/graphviz_181.dot b/test/graphviz/scanned_hard/graphviz_181.dot
new file mode 100644
index 0000000000000000000000000000000000000000..edc60c64dae2aed98804e57090befabcb8beb531
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_181.dot
@@ -0,0 +1,39 @@
+digraph {
+	rankdir=LR
+	N0 [label="Dashboard Creation" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N1 [label="Data Visualization" color="#03A9F4" fillcolor="#B3E5FC" shape=hexagon style=filled]
+	N2 [label="Data Quality Assurance" color="#A188DB" fillcolor="#DED7F0" shape=oval style=filled]
+	N3 [label="Data Cleaning" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N4 [label="Business User Training on Analytics" color="#6FE1D5" fillcolor="#C9EFEC" shape=diamond style=filled]
+	N5 [label="Risk Analytics" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
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+	subgraph cluster_Group0 {
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+	N0 -> M1 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [label=dashboards color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_182.dot b/test/graphviz/scanned_hard/graphviz_182.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9067264c8e069d9750d643d424d2bf7fd68460b0
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_182.dot
@@ -0,0 +1,39 @@
+digraph {
+	rankdir=RL
+	N0 [label="ETL Process Management" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N1 [label="Report Generation" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
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+	N5 [label="Data Warehouse Design" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
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+		nest0_1 [label="Social Media Analytics" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
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+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label=architects color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
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diff --git a/test/graphviz/scanned_hard/graphviz_183.dot b/test/graphviz/scanned_hard/graphviz_183.dot
new file mode 100644
index 0000000000000000000000000000000000000000..951cd032c1808d6c6aaf875092255713c292bf01
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_183.dot
@@ -0,0 +1,40 @@
+digraph {
+	rankdir=TD
+	N0 [label="Geospatial Analysis" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
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+	N4 [label="Customer Analytics" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
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+	N7 [label="Risk Analytics" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N8 [label="Prescriptive Analytics" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
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+	S0 -> N8 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N3 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
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diff --git a/test/graphviz/scanned_hard/graphviz_183.txt b/test/graphviz/scanned_hard/graphviz_183.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ef4fefd0d32c0892dac07ec812425b22922f3ecb
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_183.txt
@@ -0,0 +1,21 @@
+<A or B Testing Analysis, connectedTo, Data Security Best Practices>
+<Big Data Processing, connectedTo, Data Security Best Practices>
+<Big Data Processing, partOf, Big Data Processing>
+<Big Data Processing, segments, Dashboard Creation>
+<Business User Training on Analytics, connectedTo, A or B Testing Analysis>
+<Customer Analytics, connectedTo, Data Quality Assurance>
+<Dashboard Creation, connectedTo, Data Mining>
+<Dashboard Creation, partOf, Dashboard Creation>
+<Data Mining, connectedTo, Business User Training on Analytics>
+<Data Mining, partOf, Data Mining>
+<Data Pipeline Development, partOf, Data Pipeline Development>
+<Data Pipeline Development, researches, Big Data Processing>
+<Data Quality Assurance, automates, Data Visualization>
+<Data Security Best Practices, audits, Customer Analytics>
+<Data Visualization, collects, Data Pipeline Development>
+<Data Visualization, connectedTo, Prescriptive Analytics>
+<Data Visualization, connectedTo, Risk Analytics>
+<Data Visualization, connectedTo, Statistical Modeling>
+<Geospatial Analysis, forecasts, Business User Training on Analytics>
+<Prescriptive Analytics, connectedTo, Statistical Modeling>
+<Risk Analytics, connectedTo, Prescriptive Analytics>
diff --git a/test/graphviz/scanned_hard/graphviz_184.dot b/test/graphviz/scanned_hard/graphviz_184.dot
new file mode 100644
index 0000000000000000000000000000000000000000..efd69a5556701e9817b00766fc1a560a53230ee2
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_184.dot
@@ -0,0 +1,44 @@
+digraph {
+	rankdir=LR
+	N0 [label="HR Analytics Dashboards" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
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+		nest0_2 [label="KPI Definition" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
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+		nest0_1 -> nest0_2 [label=deploys color="#FFA726" dir=forward penwidth=1.5 style=dashed]
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+	N0 -> M0 [label=automates color="#000000" dir=forward penwidth=1.5 style=solid]
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diff --git a/test/graphviz/scanned_hard/graphviz_184.txt b/test/graphviz/scanned_hard/graphviz_184.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e6cf84ed0b2e10207adc23b34b791ac4847d6195
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_184.txt
@@ -0,0 +1,22 @@
+<Actionable Insights Generation, models, Self_Service BI Tools>
+<Cloud BI Solutions, dashboards, Supply Chain Optimization>
+<Data Quality Management, connectedTo, Sales Forecasting>
+<Data Quality Management, partOf, Data Quality Management>
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+<Data Storytelling for Business, connectedTo, ETL Development>
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+<ETL Development, forecasts, Cloud BI Solutions>
+<Financial Performance Reporting, connectedTo, Actionable Insights Generation>
+<HR Analytics Dashboards, audits, Data Storytelling for Business>
+<HR Analytics Dashboards, automates, Cloud BI Solutions>
+<KPI Definition, insights, Data Security in BI>
+<KPI Definition, partOf, KPI Definition>
+<Performance Monitoring, connectedTo, Financial Performance Reporting>
+<Sales Forecasting, deploys, KPI Definition>
+<Sales Forecasting, partOf, Sales Forecasting>
+<Self_Service BI Tools, connectedTo, Data Modeling>
+<Supply Chain Optimization, connectedTo, Actionable Insights Generation>
+<Supply Chain Optimization, connectedTo, Data Quality Management>
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+<Supply Chain Optimization, connectedTo, Self_Service BI Tools>
diff --git a/test/graphviz/scanned_hard/graphviz_186.txt b/test/graphviz/scanned_hard/graphviz_186.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5fa9890f82657aa5760d948c697baf44c5a7bdf5
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_186.txt
@@ -0,0 +1,25 @@
+<Actionable Insights Generation, connectedTo, HR Analytics Dashboards>
+<BI Platform Administration, complies, Query Optimization>
+<BI Platform Administration, connectedTo, Dashboard Design>
+<BI Platform Administration, connectedTo, Data Modeling>
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+<Competitive Analysis, extracts, Data Warehousing>
+<Dashboard Design, OLAPs, Data Security in BI>
+<Dashboard Design, partOf, Dashboard Design>
+<Data Lineage Tracking, connectedTo, Competitive Analysis>
+<Data Lineage Tracking, loads, Budget Performance Analysis>
+<Data Mart Design, connectedTo, Budget Performance Analysis>
+<Data Modeling, connectedTo, BI Platform Administration>
+<Data Modeling, connectedTo, Data Source Integration>
+<Data Modeling, visualizes, Sales Forecasting>
+<Data Security in BI, connectedTo, Operational Efficiency Measurement>
+<Data Security in BI, partOf, Data Security in BI>
+<Data Storytelling for Business, connectedTo, Data Mart Design>
+<Data Storytelling for Business, dashboards, Budget Performance Analysis>
+<Data Warehousing, connectedTo, Data Storytelling for Business>
+<HR Analytics Dashboards, connectedTo, Data Modeling>
+<OLAP Cube Creation, connectedTo, Data Lineage Tracking>
+<Operational Efficiency Measurement, connectedTo, BI Platform Administration>
+<Operational Efficiency Measurement, partOf, Operational Efficiency Measurement>
+<Query Optimization, plans, Sales Forecasting>
+<Sales Forecasting, connectedTo, Data Source Integration>
diff --git a/test/graphviz/scanned_hard/graphviz_188.dot b/test/graphviz/scanned_hard/graphviz_188.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a5d081767a7fc71608bf2549c52ee4eb2a37e1b7
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_188.dot
@@ -0,0 +1,51 @@
+digraph {
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+	N0 [label="Podcast Marketing" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
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+	N9 [label="Website Design and Optimization" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
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+	N12 [label="Loyalty Programs" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
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+		nest0_2 [label="Search Engine Optimization" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=tele_sells color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="manages budgets" color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label="manages affiliates" color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label="optimizes conversions" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label="creates content" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label="manages reputation" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N8 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_188.txt b/test/graphviz/scanned_hard/graphviz_188.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bdb9217a0bb743468ea02b3c882e07f4befe3309
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_188.txt
@@ -0,0 +1,25 @@
+<Campaign Performance Tracking, connectedTo, Experiential Marketing>
+<Campaign Performance Tracking, connectedTo, Telemarketing>
+<Customer Relationship Management, connectedTo, Email Marketing>
+<Customer Relationship Management, connectedTo, Pricing Strategy>
+<Customer Relationship Management, connectedTo, Social Media Marketing>
+<Customer Relationship Management, optimizes conversions, Customer Segmentation>
+<Customer Segmentation, creates content, Website Design and Optimization>
+<Distribution Channel Management, tele_sells, Product Launch Strategy>
+<Email Marketing, connectedTo, Lead Generation>
+<Email Marketing, partOf, Email Marketing>
+<Experiential Marketing, manages budgets, Video Marketing>
+<Lead Generation, connectedTo, Search Engine Optimization>
+<Lead Generation, partOf, Lead Generation>
+<Podcast Marketing, connectedTo, Distribution Channel Management>
+<Podcast Marketing, connectedTo, Experiential Marketing>
+<Pricing Strategy, connectedTo, Social Media Marketing>
+<Product Launch Strategy, connectedTo, Campaign Performance Tracking>
+<Product Launch Strategy, connectedTo, Telemarketing>
+<Product Launch Strategy, connectedTo, Video Marketing>
+<Search Engine Optimization, connectedTo, Customer Segmentation>
+<Search Engine Optimization, partOf, Search Engine Optimization>
+<Social Media Marketing, connectedTo, Loyalty Programs>
+<Telemarketing, connectedTo, Experiential Marketing>
+<Video Marketing, manages affiliates, Customer Relationship Management>
+<Website Design and Optimization, manages reputation, Pricing Strategy>
diff --git a/test/graphviz/scanned_hard/graphviz_191.dot b/test/graphviz/scanned_hard/graphviz_191.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7825aba8c5e2b86ceae64ab7d386a4ec3cfbc4f1
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_191.dot
@@ -0,0 +1,37 @@
+digraph {
+	rankdir=TD
+	N0 [label="Performance Tracking" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N1 [label="Video Advertising" color="#F44336" fillcolor="#FFCDD2" shape=plaintext style=filled]
+	N2 [label="Display Advertising" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+	N3 [label="Direct Response Campaigns" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N4 [label="Psychographic Targeting" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N5 [label="Programmatic Advertising" color="#73C6BC" fillcolor="#D0EFEE" shape=octagon style=filled]
+	N6 [label="Brand Awareness Campaigns" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N7 [label="A or B Testing for Ads" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N8 [label="Audience Targeting" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	S0 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Customer Acquisition Cost Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Television Advertising" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+		nest0_1 [label="Regulatory Compliance for Ads" color="#82DAFF" fillcolor="#C8EDFF" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label="display ads" color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N8 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [label="video ads" color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [label="creates ads" color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [label="monitors competitors" color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_191.txt b/test/graphviz/scanned_hard/graphviz_191.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7df79f8187eabb5a0a44438c349e248bf305eae9
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_191.txt
@@ -0,0 +1,17 @@
+<A or B Testing for Ads, connectedTo, Audience Targeting>
+<Brand Awareness Campaigns, connectedTo, A or B Testing for Ads>
+<Direct Response Campaigns, connectedTo, Brand Awareness Campaigns>
+<Direct Response Campaigns, connectedTo, Psychographic Targeting>
+<Direct Response Campaigns, monitors competitors, Programmatic Advertising>
+<Display Advertising, connectedTo, Direct Response Campaigns>
+<Performance Tracking, display ads, Video Advertising>
+<Programmatic Advertising, connectedTo, Brand Awareness Campaigns>
+<Psychographic Targeting, connectedTo, Programmatic Advertising>
+<Psychographic Targeting, connectedTo, Television Advertising>
+<Regulatory Compliance for Ads, connectedTo, Audience Targeting>
+<Regulatory Compliance for Ads, partOf, Regulatory Compliance for Ads>
+<Television Advertising, connectedTo, Regulatory Compliance for Ads>
+<Television Advertising, partOf, Television Advertising>
+<Video Advertising, connectedTo, Display Advertising>
+<Video Advertising, creates ads, Direct Response Campaigns>
+<Video Advertising, video ads, Brand Awareness Campaigns>
diff --git a/test/graphviz/scanned_hard/graphviz_192.txt b/test/graphviz/scanned_hard/graphviz_192.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b98995a88132437224c39cefd832127e3a645ad4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_192.txt
@@ -0,0 +1,19 @@
+<Ad Creative Development, connectedTo, Performance Tracking>
+<Ad Network Management, connectedTo, Campaign Planning>
+<Audience Segmentation for Ads, connectedTo, Ad Creative Development>
+<Competitor Ad Analysis, ensures compliance, Audience Segmentation for Ads>
+<Demographic Targeting, connectedTo, Landing Page Optimization>
+<Demographic Targeting, connectedTo, Privacy Concerns in Ads>
+<Demographic Targeting, targets psychographics, Native Advertising>
+<Display Advertising, connectedTo, Ad Creative Development>
+<Display Advertising, partOf, Display Advertising>
+<Geo_Targeting, connectedTo, Display Advertising>
+<Geo_Targeting, partOf, Geo_Targeting>
+<Landing Page Optimization, connectedTo, Native Advertising>
+<Landing Page Optimization, tracks performance, Geo_Targeting>
+<Native Advertising, connectedTo, Performance Tracking>
+<Native Advertising, connectedTo, Visual Design for Ads>
+<Performance Tracking, connectedTo, Ad Network Management>
+<Privacy Concerns in Ads, digital advertising, Competitor Ad Analysis>
+<Visual Design for Ads, connectedTo, Privacy Concerns in Ads>
+<Visual Design for Ads, generates responses, Performance Tracking>
diff --git a/test/graphviz/scanned_hard/graphviz_193.dot b/test/graphviz/scanned_hard/graphviz_193.dot
new file mode 100644
index 0000000000000000000000000000000000000000..463021eaaad0526cea354e85ced4423cdb35cefa
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_193.dot
@@ -0,0 +1,39 @@
+digraph {
+	rankdir=TD
+	N0 [label="Initial Coin Offerings" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N1 [label="Real Estate Tokenization" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+	N2 [label="Zero_Knowledge Proofs" color="#BDAFA8" fillcolor="#E4E0DF" shape=oval style=filled]
+	N3 [label="Public Blockchain Deployment" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+	N4 [label="Security Auditing for Blockchains" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N5 [label="Gaming on Blockchain" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N6 [label="Voting Systems on Blockchain" color="#CDDC39" fillcolor="#E6EE9C" shape=plaintext style=filled]
+	N7 [label="Private Blockchain Implementation" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N8 [label="Healthcare Data Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N9 [label="Wallet Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	S0 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Decentralized Network Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Interoperability Solutions" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest0_1 [label="Regulatory Compliance for Blockchain" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label="builds NFTs" color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="verifies transactions" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label="facilitates finance" color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [label="operates nodes" color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_193.txt b/test/graphviz/scanned_hard/graphviz_193.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5377b37ccf4c93dabcef089e27b61e898ed4c9b4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_193.txt
@@ -0,0 +1,18 @@
+<Gaming on Blockchain, verifies transactions, Voting Systems on Blockchain>
+<Healthcare Data Management, facilitates finance, Wallet Management>
+<Initial Coin Offerings, connectedTo, Healthcare Data Management>
+<Initial Coin Offerings, connectedTo, Real Estate Tokenization>
+<Interoperability Solutions, connectedTo, Regulatory Compliance for Blockchain>
+<Interoperability Solutions, partOf, Interoperability Solutions>
+<Private Blockchain Implementation, connectedTo, Healthcare Data Management>
+<Public Blockchain Deployment, connectedTo, Gaming on Blockchain>
+<Public Blockchain Deployment, connectedTo, Security Auditing for Blockchains>
+<Public Blockchain Deployment, connectedTo, Wallet Management>
+<Real Estate Tokenization, connectedTo, Healthcare Data Management>
+<Real Estate Tokenization, connectedTo, Zero_Knowledge Proofs>
+<Regulatory Compliance for Blockchain, connectedTo, Gaming on Blockchain>
+<Regulatory Compliance for Blockchain, partOf, Regulatory Compliance for Blockchain>
+<Security Auditing for Blockchains, builds NFTs, Gaming on Blockchain>
+<Voting Systems on Blockchain, connectedTo, Private Blockchain Implementation>
+<Voting Systems on Blockchain, operates nodes, Interoperability Solutions>
+<Zero_Knowledge Proofs, connectedTo, Public Blockchain Deployment>
diff --git a/test/graphviz/scanned_hard/graphviz_195.dot b/test/graphviz/scanned_hard/graphviz_195.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a8939fca650ba70cce6dce97499ca6c155c776fb
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_195.dot
@@ -0,0 +1,41 @@
+digraph {
+	rankdir=TD
+	N0 [label="Decentralized Applications Development" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Interoperability Solutions" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N2 [label="Transaction Verification" color="#A188DB" fillcolor="#DED7F0" shape=folder style=filled]
+	N3 [label="Smart Contract Development" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N4 [label="Voting Systems on Blockchain" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N5 [label="Identity Verification on Blockchain" color="#4CAF50" fillcolor="#C8E6C9" shape=folder style=filled]
+	N6 [label="Cross_Chain Bridges" color="#4CAF50" fillcolor="#C8E6C9" shape=folder style=filled]
+	N7 [label="Cryptographic Hashing" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N8 [label="Mining Operations" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N9 [label="Financial Asset Tokenization" color="#4CAF50" fillcolor="#C8E6C9" shape=Mdiamond style=filled]
+	N10 [label="Intellectual Property Management" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Wallet Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Tokenomics Design" color="#388E3C" fillcolor="#F1F8E9" shape=Mdiamond style=filled]
+		nest0_1 [label="Private Blockchain Implementation" color="#388E3C" fillcolor="#F1F8E9" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="optimizes energy" color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="verifies transactions" color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N5 [label="powers games" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [label="governs DAOs" color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [label="conducts ICOs" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [label="scales systems" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_196.txt b/test/graphviz/scanned_hard/graphviz_196.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0b9b03ec8ac8e800b66a4ba8670bd88bb78bac6a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_196.txt
@@ -0,0 +1,23 @@
+<Blockchain Explorers, connectedTo, Key Management>
+<Blockchain Integration, connectedTo, Tax Reporting for Crypto>
+<Cold Storage Solutions, connectedTo, Hot Wallet Security>
+<Cold Storage Solutions, partOf, Cold Storage Solutions>
+<Community Building, connectedTo, Hot Wallet Security>
+<Community Building, connectedTo, Portfolio Management>
+<Community Building, connectedTo, Regulatory Compliance>
+<Community Building, connectedTo, Tax Reporting for Crypto>
+<Cross_chain Swaps, connectedTo, Interoperability Solutions>
+<Cryptocurrency Trading Bots, connectedTo, Yield Farming>
+<Fraud Prevention, connectedTo, Yield Farming>
+<Fraud Prevention, designs tokenomics, Cryptocurrency Trading Bots>
+<GameFi Development, connectedTo, Cold Storage Solutions>
+<GameFi Development, partOf, GameFi Development>
+<Hot Wallet Security, lists assets, Blockchain Integration>
+<Interoperability Solutions, operates protocols, Staking>
+<Key Management, develops exchanges, Fraud Prevention>
+<Key Management, prevents fraud, Yield Farming>
+<Portfolio Management, lends funds, Hot Wallet Security>
+<Regulatory Compliance, connectedTo, Portfolio Management>
+<Staking, connectedTo, Blockchain Explorers>
+<Yield Farming, connectedTo, GameFi Development>
+<Yield Farming, ensures compliance, Community Building>
diff --git a/test/graphviz/scanned_hard/graphviz_197.dot b/test/graphviz/scanned_hard/graphviz_197.dot
new file mode 100644
index 0000000000000000000000000000000000000000..505a635b7f08f031a11435d96a9d68bd11853477
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_197.dot
@@ -0,0 +1,47 @@
+digraph {
+	rankdir=LR
+	N0 [label="Web3 Integration" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Blockchain Integration" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N2 [label="Market Analysis" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N3 [label="Lending and Borrowing Protocols" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N4 [label="Smart Contract Auditing" color="#7986CB" fillcolor="#E8EAF6" shape=plaintext style=filled]
+	N5 [label="Wallet Development" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N6 [label=Staking color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N7 [label="Interoperability Solutions" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+	N8 [label="Hot Wallet Security" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+	N9 [label="Airdrop Campaigns" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	S0 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Blockchain Explorers" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="KYC or AML Procedures" color="#2196F3" fillcolor="#BBDEFB" shape=oval style=filled]
+		nest0_1 [label="Decentralized Autonomous Organizations" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+		nest0_2 [label="Community Building" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+		nest0_3 [label="Portfolio Management" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+		nest0_0 -> nest0_1 [label="manages portfolios" color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="facilitates trades" color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="lists assets" color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label="calculates taxes" color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_197.txt b/test/graphviz/scanned_hard/graphviz_197.txt
new file mode 100644
index 0000000000000000000000000000000000000000..de30f6cf8cb640cf0e0abb96dc1b26f288fa26dd
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_197.txt
@@ -0,0 +1,24 @@
+<Blockchain Integration, connectedTo, Hot Wallet Security>
+<Blockchain Integration, connectedTo, Wallet Development>
+<Blockchain Integration, facilitates trades, Market Analysis>
+<Community Building, connectedTo, Portfolio Management>
+<Community Building, partOf, Community Building>
+<Decentralized Autonomous Organizations, connectedTo, Community Building>
+<Decentralized Autonomous Organizations, partOf, Decentralized Autonomous Organizations>
+<Hot Wallet Security, connectedTo, Airdrop Campaigns>
+<Interoperability Solutions, calculates taxes, Hot Wallet Security>
+<Interoperability Solutions, connectedTo, KYC or AML Procedures>
+<KYC or AML Procedures, manages portfolios, Decentralized Autonomous Organizations>
+<KYC or AML Procedures, partOf, KYC or AML Procedures>
+<Lending and Borrowing Protocols, connectedTo, Airdrop Campaigns>
+<Lending and Borrowing Protocols, connectedTo, Hot Wallet Security>
+<Lending and Borrowing Protocols, lists assets, Smart Contract Auditing>
+<Market Analysis, connectedTo, Lending and Borrowing Protocols>
+<Market Analysis, connectedTo, Smart Contract Auditing>
+<Portfolio Management, connectedTo, Wallet Development>
+<Portfolio Management, partOf, Portfolio Management>
+<Smart Contract Auditing, connectedTo, Wallet Development>
+<Staking, connectedTo, Interoperability Solutions>
+<Wallet Development, connectedTo, Staking>
+<Web3 Integration, connectedTo, Blockchain Integration>
+<Web3 Integration, connectedTo, Smart Contract Auditing>
diff --git a/test/graphviz/scanned_hard/graphviz_198.dot b/test/graphviz/scanned_hard/graphviz_198.dot
new file mode 100644
index 0000000000000000000000000000000000000000..bd9fd9b3d82dc890a3ddf23d40344c9577d820d4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_198.dot
@@ -0,0 +1,43 @@
+digraph {
+	rankdir=BT
+	N0 [label="Cryptocurrency Trading Bots" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N1 [label="Cold Storage Solutions" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N2 [label="Initial Exchange Offering" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N3 [label="Decentralized Exchange Operation" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N4 [label="Airdrop Campaigns" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N5 [label="Interoperability Solutions" color="#BDAFA8" fillcolor="#E4E0DF" shape=oval style=filled]
+	N6 [label="Custodial Services" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N7 [label="Venture Capital Funding" color="#00BCD4" fillcolor="#E0F7FA" shape=diamond style=filled]
+	N8 [label="Hot Wallet Security" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N9 [label="Portfolio Management" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N10 [label="Coin Creation" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	S0 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Market Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="NFT Marketplace Development" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest0_1 [label="Cryptocurrency Education" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+		nest0_2 [label="Security Audits" color="#90A4AE" fillcolor="#ECEFF1" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [label="distributes airdrops" color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label="prevents fraud" color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label="analyzes markets" color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [label="generates yield" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_20.dot b/test/graphviz/scanned_hard/graphviz_20.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ad0d2fd6541bf62180b6eb8591642ccba6279de2
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_20.dot
@@ -0,0 +1,27 @@
+digraph {
+	rankdir=BT
+	N0 [label="New Material Development" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N1 [label="Re_entry Vehicle Design" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N2 [label="Launch Window Calculation" color="#C0CA33" fillcolor="#F9FBE7" shape=plaintext style=filled]
+	N3 [label="Rocket Assembly" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N4 [label="Aircraft Maintenance Log" color="#4DB6AC" fillcolor="#E0F2F1" shape=octagon style=filled]
+	N5 [label="Airframe Assembly" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N6 [label="Air Traffic Control Integration" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+	N7 [label="Satellite Data Processing" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N8 [label="Structural Analysis" color="#FFCC80" fillcolor="#FFF0CC" shape=Mdiamond style=filled]
+	N9 [label="Data Transmission" color="#C0CA33" fillcolor="#F9FBE7" shape=plaintext style=filled]
+	N10 [label="Propulsion Testing" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N11 [label="Aircraft Manufacturing" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=prototypes color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=coordinates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=adjusts color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=reboots color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=transmits color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N8 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_20.txt b/test/graphviz/scanned_hard/graphviz_20.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e1e2ce9b4da51ff95701b220338ef1a3e6cb952b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_20.txt
@@ -0,0 +1,12 @@
+<Air Traffic Control Integration, connectedTo, Satellite Data Processing>
+<Aircraft Maintenance Log, connectedTo, Airframe Assembly>
+<Aircraft Manufacturing, connectedTo, Structural Analysis>
+<Airframe Assembly, connectedTo, Air Traffic Control Integration>
+<Data Transmission, reboots, Propulsion Testing>
+<Launch Window Calculation, connectedTo, Rocket Assembly>
+<New Material Development, connectedTo, Re_entry Vehicle Design>
+<Propulsion Testing, transmits, Aircraft Manufacturing>
+<Re_entry Vehicle Design, prototypes, Launch Window Calculation>
+<Rocket Assembly, connectedTo, Aircraft Maintenance Log>
+<Satellite Data Processing, coordinates, Structural Analysis>
+<Structural Analysis, adjusts, Data Transmission>
diff --git a/test/graphviz/scanned_hard/graphviz_202.dot b/test/graphviz/scanned_hard/graphviz_202.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7f6aadb21125d5f07bcfe309573d4aaea0762542
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_202.dot
@@ -0,0 +1,33 @@
+digraph {
+	rankdir=TD
+	N0 [label="Agricultural IoT" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="IoT Device Certification" color="#A1887F" fillcolor="#EFEBE9" shape=folder style=filled]
+	N2 [label="Network Protocol Selection" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+	N3 [label="Smart City Sensors" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+	N4 [label="Wearable Technology" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N5 [label="Smart Manufacturing" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="User Interface for IoT Apps" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cloud Platform Integration" color="#A1887F" fillcolor="#EFEBE9" shape=Mdiamond style=filled]
+		nest0_1 [label="Predictive Maintenance" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+		nest0_2 [label="Security Implementation" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+		nest0_3 [label="Supply Chain Optimization" color="#A1887F" fillcolor="#EFEBE9" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_3 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label="manages energy grids" color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="manufactures devices" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="monitors environment" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N3 [label="controls devices" color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [label="prototypes devices" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_203.dot b/test/graphviz/scanned_hard/graphviz_203.dot
new file mode 100644
index 0000000000000000000000000000000000000000..733099bdcbe71e473dfb04d5b32a05d7e2ccf67a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_203.dot
@@ -0,0 +1,47 @@
+digraph {
+	rankdir=BT
+	N0 [label="Connectivity Management" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Agricultural IoT" color="#388E3C" fillcolor="#C8E6C9" shape=oval style=filled]
+	N2 [label="Device Prototyping" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N3 [label="Data Collection" color="#E0E0E0" fillcolor="#EBEBEB" shape=diamond style=filled]
+	N4 [label="IoT Device Certification" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N5 [label="Smart Manufacturing" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N6 [label="Industrial IoT" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+	N7 [label="Data Privacy in IoT" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	S0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Data Analysis in Cloud" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Smart Home Devices" color="#388E3C" fillcolor="#C8E6C9" shape=folder style=filled]
+		nest0_1 [label="User Interface for IoT Apps" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+		nest0_2 [label="Wearable Technology" color="#388E3C" fillcolor="#C8E6C9" shape=plaintext style=filled]
+		nest0_3 [label="API Development for IoT" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label="designs UIs" color="#388E3C" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="optimizes operations" color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [label="processes streams" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [label="manages deployments" color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [label="manufactures devices" color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_203.txt b/test/graphviz/scanned_hard/graphviz_203.txt
new file mode 100644
index 0000000000000000000000000000000000000000..32369fb30d1265e09ce07c754aa012abbcf757fd
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_203.txt
@@ -0,0 +1,24 @@
+<API Development for IoT, connectedTo, Industrial IoT>
+<API Development for IoT, partOf, API Development for IoT>
+<Agricultural IoT, connectedTo, Device Prototyping>
+<Agricultural IoT, connectedTo, Smart Manufacturing>
+<Agricultural IoT, manufactures devices, Data Collection>
+<Connectivity Management, connectedTo, Agricultural IoT>
+<Connectivity Management, connectedTo, Data Collection>
+<Data Collection, connectedTo, IoT Device Certification>
+<Data Collection, connectedTo, Smart Manufacturing>
+<Device Prototyping, connectedTo, Data Collection>
+<Device Prototyping, connectedTo, Data Privacy in IoT>
+<Device Prototyping, connectedTo, Industrial IoT>
+<Industrial IoT, optimizes operations, Data Privacy in IoT>
+<IoT Device Certification, connectedTo, Data Privacy in IoT>
+<IoT Device Certification, connectedTo, Smart Manufacturing>
+<IoT Device Certification, manages deployments, Industrial IoT>
+<Smart Home Devices, connectedTo, User Interface for IoT Apps>
+<Smart Home Devices, partOf, Smart Home Devices>
+<Smart Manufacturing, connectedTo, Industrial IoT>
+<Smart Manufacturing, processes streams, Smart Home Devices>
+<User Interface for IoT Apps, designs UIs, Wearable Technology>
+<User Interface for IoT Apps, partOf, User Interface for IoT Apps>
+<Wearable Technology, connectedTo, API Development for IoT>
+<Wearable Technology, partOf, Wearable Technology>
diff --git a/test/graphviz/scanned_hard/graphviz_204.txt b/test/graphviz/scanned_hard/graphviz_204.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1dbdd9d22a11c31b1b3a64955ef5a7f483d170cc
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_204.txt
@@ -0,0 +1,25 @@
+<AI at the Edge, connectedTo, Over_the_Air Updates>
+<AI at the Edge, partOf, AI at the Edge>
+<API Development for IoT, connectedTo, AI at the Edge>
+<API Development for IoT, partOf, API Development for IoT>
+<Blockchain for IoT Security, connectedTo, Power Management for Devices>
+<Connectivity Management, connectedTo, Blockchain for IoT Security>
+<Connectivity Management, connectedTo, Data Collection>
+<Connectivity Management, manages deployments, Real_time Data Streaming>
+<Connectivity Management, monitors environment, Blockchain for IoT Security>
+<Data Collection, connectedTo, Predictive Maintenance>
+<Data Collection, designs UIs, Blockchain for IoT Security>
+<Industrial IoT, connectedTo, API Development for IoT>
+<Industrial IoT, partOf, Industrial IoT>
+<Over_the_Air Updates, connectedTo, Industrial IoT>
+<Over_the_Air Updates, connectedTo, User Interface for IoT Apps>
+<Power Management for Devices, connectedTo, Transportation IoT>
+<Predictive Maintenance, connectedTo, Blockchain for IoT Security>
+<Real_time Data Streaming, enhances agriculture, Over_the_Air Updates>
+<Sensor Integration, connectedTo, Wearable Technology>
+<Smart Home Devices, connectedTo, Real_time Data Streaming>
+<Supply Chain Optimization, connectedTo, Blockchain for IoT Security>
+<Supply Chain Optimization, connectedTo, Connectivity Management>
+<Transportation IoT, complies with regulations, Sensor Integration>
+<User Interface for IoT Apps, ensures interoperability, Retail IoT>
+<Wearable Technology, connectedTo, Smart Home Devices>
diff --git a/test/graphviz/scanned_hard/graphviz_205.txt b/test/graphviz/scanned_hard/graphviz_205.txt
new file mode 100644
index 0000000000000000000000000000000000000000..073b8e51bc17644fdb2d556b9cf7490199f9de97
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_205.txt
@@ -0,0 +1,26 @@
+<Compliance and Governance at Edge, connectedTo, Telecom Edge Computing>
+<Containerization at Edge, connectedTo, Edge Device Provisioning>
+<Containerization at Edge, connectedTo, Telecom Edge Computing>
+<Data Filtering at Edge, connectedTo, Containerization at Edge>
+<Data Filtering at Edge, supports industrial IoT, Latency Reduction>
+<Edge AI Model Deployment, partOf, Edge AI Model Deployment>
+<Edge AI Model Deployment, provides fault tolerance, Edge Device Analytics>
+<Edge Application Development, analyzes data at edge, Latency Reduction>
+<Edge Application Development, connectedTo, Data Filtering at Edge>
+<Edge Computing Hardware Selection, partOf, Edge Computing Hardware Selection>
+<Edge Computing Hardware Selection, processes events, Event_Driven Architectures at Edge>
+<Edge Device Analytics, connectedTo, Security for Edge Devices>
+<Edge Device Provisioning, connectedTo, Industrial Edge Computing>
+<Edge Network Topology Design, connectedTo, Edge Device Analytics>
+<Edge_to_Cloud Data Transfer Optimization, connectedTo, Telecom Edge Computing>
+<Edge_to_Cloud Data Transfer Optimization, manages power consumption, Compliance and Governance at Edge>
+<Event_Driven Architectures at Edge, connectedTo, Edge AI Model Deployment>
+<Event_Driven Architectures at Edge, partOf, Event_Driven Architectures at Edge>
+<Industrial Edge Computing, connectedTo, Orchestration of Edge Workloads>
+<Latency Reduction, connectedTo, Edge Computing Hardware Selection>
+<Latency Reduction, connects endpoints, Edge Network Topology Design>
+<Orchestration of Edge Workloads, connectedTo, Virtualization at Edge>
+<Security for Edge Devices, connectedTo, Compliance and Governance at Edge>
+<Security for Edge Devices, connectedTo, Edge_to_Cloud Data Transfer Optimization>
+<Security for Edge Devices, connectedTo, Telecom Edge Computing>
+<Virtualization at Edge, connectedTo, Latency Reduction>
diff --git a/test/graphviz/scanned_hard/graphviz_207.dot b/test/graphviz/scanned_hard/graphviz_207.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4519818acb29d4ba5047881ea253f747d9bf9d99
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_207.dot
@@ -0,0 +1,39 @@
+digraph {
+	rankdir=LR
+	N0 [label="Edge Device Analytics" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N1 [label="Healthcare Edge Computing" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N2 [label="Network Optimization for Edge" color="#42A5F5" fillcolor="#F1F8FF" shape=plaintext style=filled]
+	N3 [label="Connectivity to Cloud" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N4 [label="Power Consumption Optimization" color="#42A5F5" fillcolor="#F1F8FF" shape=Mdiamond style=filled]
+	N5 [label="Real_time Analytics at Edge" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N6 [label="Virtualization at Edge" color="#42A5F5" fillcolor="#F1F8FF" shape=octagon style=filled]
+	N7 [label="Edge Network Topology Design" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N8 [label="Edge Data Processing" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	S0 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Retail Edge Computing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Remote Device Management" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+		nest0_1 [label="Compliance and Governance at Edge" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+		nest0_0 -> nest0_1 [label="implements virtual machines" color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label="enhances privacy" color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="deploys analytics" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label="deploys nodes" color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N3 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [label="processes events" color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label="manages microservices" color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_207.txt b/test/graphviz/scanned_hard/graphviz_207.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0a100eae3b874c62f52a46f8941d613655703741
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_207.txt
@@ -0,0 +1,19 @@
+<Compliance and Governance at Edge, connectedTo, Connectivity to Cloud>
+<Compliance and Governance at Edge, partOf, Compliance and Governance at Edge>
+<Connectivity to Cloud, connectedTo, Power Consumption Optimization>
+<Connectivity to Cloud, manages microservices, Real_time Analytics at Edge>
+<Edge Device Analytics, connectedTo, Real_time Analytics at Edge>
+<Edge Device Analytics, enhances privacy, Healthcare Edge Computing>
+<Edge Network Topology Design, connectedTo, Edge Data Processing>
+<Healthcare Edge Computing, deploys analytics, Network Optimization for Edge>
+<Network Optimization for Edge, connectedTo, Connectivity to Cloud>
+<Network Optimization for Edge, connectedTo, Edge Network Topology Design>
+<Network Optimization for Edge, connectedTo, Power Consumption Optimization>
+<Network Optimization for Edge, connectedTo, Real_time Analytics at Edge>
+<Network Optimization for Edge, connectedTo, Remote Device Management>
+<Network Optimization for Edge, processes events, Edge Data Processing>
+<Power Consumption Optimization, connectedTo, Real_time Analytics at Edge>
+<Real_time Analytics at Edge, connectedTo, Virtualization at Edge>
+<Remote Device Management, implements virtual machines, Compliance and Governance at Edge>
+<Remote Device Management, partOf, Remote Device Management>
+<Virtualization at Edge, deploys nodes, Edge Network Topology Design>
diff --git a/test/graphviz/scanned_hard/graphviz_209.dot b/test/graphviz/scanned_hard/graphviz_209.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9070d186aa3318218c29c2752267f671bb0f782d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_209.dot
@@ -0,0 +1,49 @@
+digraph {
+	rankdir=BT
+	N0 [label="Hybrid Cloud Deployment" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N1 [label="Cloud Marketplace Integration" color="#FFF176" fillcolor="#FFFDE7" shape=oval style=filled]
+	N2 [label="Cloud Automation" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N3 [label="CI or CD Pipelines in Cloud" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N4 [label="Cloud Backup Solutions" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+	N5 [label="Cloud Monitoring and Logging" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N6 [label="Disaster Recovery in Cloud" color="#FFF176" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+	N7 [label="DevOps on Cloud" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N8 [label="Platform as a Service" color="#E0E0E0" fillcolor="#EBEBEB" shape=parallelogram style=filled]
+	N9 [label="Data Storage in Cloud" color="#E0E0E0" fillcolor="#EBEBEB" shape=diamond style=filled]
+	N10 [label="Auto_Scaling Configurations" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N11 [label="Infrastructure as a Service" color="#E0E0E0" fillcolor="#EBEBEB" shape=plaintext style=filled]
+	N12 [label="Cost Optimization in Cloud" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	S0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Compliance in Cloud" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cloud FinOps" color="#FFF176" fillcolor="#FFFDE7" shape=Mdiamond style=filled]
+		nest0_1 [label="Database as a Service" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="ensures governance" color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label="configures networks" color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [label="implements DR" color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> S0 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [label="stores data" color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [label="manages IAMs" color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label="provides IaaS" color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_21.txt b/test/graphviz/scanned_hard/graphviz_21.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fdd039ee2580013c3297f27d525442a5dcb54e31
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_21.txt
@@ -0,0 +1,10 @@
+<Broker Management, connectedTo, Property Damage Assessment>
+<Broker Management, renews, Subrogation>
+<Claim Submission, policies, Policy Issuance>
+<Customer Communication, manages, Claim Adjustment>
+<Policy Issuance, connectedTo, Broker Management>
+<Property Damage Assessment, connectedTo, Subrogation>
+<Reinsurance Negotiation, connectedTo, Claim Submission>
+<Subrogation, connectedTo, Customer Communication>
+<Third_Party Administrator Liaison, mitigates, Underwriting>
+<Underwriting, prevents, Reinsurance Negotiation>
diff --git a/test/graphviz/scanned_hard/graphviz_210.dot b/test/graphviz/scanned_hard/graphviz_210.dot
new file mode 100644
index 0000000000000000000000000000000000000000..667c96e34093358db83527b50e59571aba0e5e27
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_210.dot
@@ -0,0 +1,44 @@
+digraph {
+	rankdir=TD
+	N0 [label="Cost Optimization in Cloud" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N1 [label="Cloud Marketplace Integration" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N2 [label="Cloud Governance" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N3 [label="Compliance in Cloud" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N4 [label="Edge_to_Cloud Integration" color="#FFA726" fillcolor="#FFF3E0" shape=octagon style=filled]
+	N5 [label="Serverless Computing" color="#3F51B5" fillcolor="#C5CAE9" shape=plaintext style=filled]
+	N6 [label="Resource Tagging for Cost Allocation" color="#CB9BE1" fillcolor="#F2E6F5" shape=octagon style=filled]
+	N7 [label="Disaster Recovery in Cloud" color="#FFA726" fillcolor="#FFF3E0" shape=parallelogram style=filled]
+	N8 [label="Cloud Monitoring and Logging" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+	N9 [label="Cloud Vendor Lock_in Mitigation" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N10 [label="CI or CD Pipelines in Cloud" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N11 [label="Cloud Architecture Design" color="#3F51B5" fillcolor="#C5CAE9" shape=Mdiamond style=filled]
+	N12 [label="Load Balancing in Cloud" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Infrastructure as a Service" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cloud Backup Solutions" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_1 [label="Hybrid Cloud Deployment" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+		nest0_2 [label="DevOps on Cloud" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest0_0 -> nest0_1 [label="integrates edge" color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="automates CI or CD" color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label="implements FinOps" color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label="tags resources" color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label="manages load balancing" color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label="performs backups" color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N8 -> S0 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N8 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_212.dot b/test/graphviz/scanned_hard/graphviz_212.dot
new file mode 100644
index 0000000000000000000000000000000000000000..da589c1b27952b825c1ac174a031eb08898fa2b6
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_212.dot
@@ -0,0 +1,33 @@
+digraph {
+	rankdir=RL
+	N0 [label="Proxy Server Configuration" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N1 [label="IT Asset Management" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N2 [label="Network Design" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N3 [label="DNS Management" color="#FFC107" fillcolor="#FFECB3" shape=Mdiamond style=filled]
+	N4 [label="Troubleshooting and Support" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N5 [label="Directory Services" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N6 [label="Network Security" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	S0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Database Administration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Software Licensing Management" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+		nest0_1 [label="Access Control Systems" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+		nest0_2 [label="Group Policy Management" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="manages users" color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="monitors performance" color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [label="automates tasks" color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N5 [label="manages storage" color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N5 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_213.txt b/test/graphviz/scanned_hard/graphviz_213.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8fc6113d8eaff09befc99ee29f9287d72f2f88f9
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_213.txt
@@ -0,0 +1,19 @@
+<Automation Scripting, connectedTo, Monitoring and Alerting>
+<Backup and Recovery Systems, connectedTo, Hardware Procurement>
+<Backup and Recovery Systems, partOf, Backup and Recovery Systems>
+<Hardware Procurement, connectedTo, Network Performance Tuning>
+<Hardware Procurement, partOf, Hardware Procurement>
+<Monitoring and Alerting, connectedTo, Server Deployment>
+<Monitoring and Alerting, manages remote access, VPN Configuration>
+<Network Design, applies patches, Remote Access Solutions>
+<Network Design, installs software, Virtualization>
+<Network Design, plans capacity, Web Server Configuration>
+<Network Performance Tuning, connectedTo, Monitoring and Alerting>
+<Network Performance Tuning, partOf, Network Performance Tuning>
+<Patch Management, connectedTo, VPN Configuration>
+<Remote Access Solutions, connectedTo, Patch Management>
+<Server Deployment, connectedTo, Network Design>
+<Virtualization, virtualizes resources, Web Server Configuration>
+<Web Server Configuration, connectedTo, Backup and Recovery Systems>
+<Web Server Configuration, connectedTo, Remote Access Solutions>
+<Web Server Configuration, connectedTo, VPN Configuration>
diff --git a/test/graphviz/scanned_hard/graphviz_214.dot b/test/graphviz/scanned_hard/graphviz_214.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5ff1f0da4eb48e95beafabd059e876d3f58535e3
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_214.dot
@@ -0,0 +1,43 @@
+digraph {
+	rankdir=RL
+	N0 [label="Alerting and Incident Response" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N1 [label="Observability Implementation" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N2 [label="Site Reliability Engineering Principles" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N3 [label="Performance Metrics Analysis" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N4 [label="Code Quality Checks" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+	N5 [label="Automated Testing" color="#A2D0FF" fillcolor="#E8F0FF" shape=octagon style=filled]
+	N6 [label="Configuration Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=oval style=filled]
+	N7 [label="Feature Flags" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Chaos Engineering" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Infrastructure as Code" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+		nest0_1 [label="Dynamic Application Security Testing" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+		nest0_2 [label="Cloud Native Development" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label="performs rollbacks" color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="enables CD" color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="orchestrates containers" color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="practices chaos engineering" color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [label="automates pipelines" color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [label="codes features" color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N2 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_214.txt b/test/graphviz/scanned_hard/graphviz_214.txt
new file mode 100644
index 0000000000000000000000000000000000000000..60eba489149007955544e4c81573398d7f37714a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_214.txt
@@ -0,0 +1,21 @@
+<Alerting and Incident Response, codes features, Feature Flags>
+<Alerting and Incident Response, connectedTo, Automated Testing>
+<Alerting and Incident Response, connectedTo, Observability Implementation>
+<Alerting and Incident Response, connectedTo, Performance Metrics Analysis>
+<Alerting and Incident Response, connectedTo, Site Reliability Engineering Principles>
+<Automated Testing, orchestrates containers, Configuration Management>
+<Cloud Native Development, automates pipelines, Code Quality Checks>
+<Cloud Native Development, partOf, Cloud Native Development>
+<Code Quality Checks, connectedTo, Infrastructure as Code>
+<Code Quality Checks, enables CD, Automated Testing>
+<Configuration Management, practices chaos engineering, Feature Flags>
+<Dynamic Application Security Testing, partOf, Dynamic Application Security Testing>
+<Dynamic Application Security Testing, performs rollbacks, Cloud Native Development>
+<Infrastructure as Code, connectedTo, Dynamic Application Security Testing>
+<Infrastructure as Code, partOf, Infrastructure as Code>
+<Observability Implementation, connectedTo, Automated Testing>
+<Observability Implementation, connectedTo, Performance Metrics Analysis>
+<Observability Implementation, connectedTo, Site Reliability Engineering Principles>
+<Performance Metrics Analysis, connectedTo, Code Quality Checks>
+<Site Reliability Engineering Principles, connectedTo, Automated Testing>
+<Site Reliability Engineering Principles, connectedTo, Performance Metrics Analysis>
diff --git a/test/graphviz/scanned_hard/graphviz_215.txt b/test/graphviz/scanned_hard/graphviz_215.txt
new file mode 100644
index 0000000000000000000000000000000000000000..984e74ad8d884d8affd39b2b1deea1a0c3b607bd
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_215.txt
@@ -0,0 +1,25 @@
+<Automated Deployment, connectedTo, Infrastructure Provisioning>
+<Blue_Green Deployments, implements blue_green, Automated Deployment>
+<Canary Releases, connectedTo, Cross_Functional Team Collaboration>
+<Cloud Native Development, connectedTo, Observability Implementation>
+<Cloud Native Development, partOf, Cloud Native Development>
+<Code Quality Checks, connectedTo, Microservices Architecture>
+<Collaboration Tools, connectedTo, Blue_Green Deployments>
+<Configuration Management, connectedTo, Containerization>
+<Container Orchestration, collects metrics, Code Quality Checks>
+<Containerization, connectedTo, GitOps>
+<Containerization, connectedTo, Infrastructure Provisioning>
+<Containerization, connectedTo, Release Management>
+<Cross_Functional Team Collaboration, fosters collaboration, Cloud Native Development>
+<Cross_Functional Team Collaboration, manages immutable infrastructure, Container Orchestration>
+<Environment Management, configures environments, Container Orchestration>
+<Environment Management, partOf, Environment Management>
+<Feedback Loops, enables ChatOps, Configuration Management>
+<Immutable Infrastructure, ensures observability, Canary Releases>
+<Infrastructure Provisioning, connectedTo, GitOps>
+<Microservices Architecture, connectedTo, Collaboration Tools>
+<Microservices Architecture, connectedTo, Feedback Loops>
+<Microservices Architecture, integrates security, Automated Deployment>
+<Observability Implementation, partOf, Observability Implementation>
+<Observability Implementation, secures secrets, Environment Management>
+<Release Management, connectedTo, Collaboration Tools>
diff --git a/test/graphviz/scanned_hard/graphviz_217.dot b/test/graphviz/scanned_hard/graphviz_217.dot
new file mode 100644
index 0000000000000000000000000000000000000000..de22e046fff84d0b3619e008ca2b930ba147a9b2
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_217.dot
@@ -0,0 +1,40 @@
+digraph {
+	rankdir=RL
+	N0 [label="Security Hardening" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N1 [label="Continuous Integration" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N2 [label="Version Control" color="#80DDEA" fillcolor="#D3F7F9" shape=octagon style=filled]
+	N3 [label="Continuous Delivery" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N4 [label="System Design" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N5 [label="Mobile Application Development" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+	N6 [label="Cloud_Native Development" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label=Deployment labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Desktop Application Development" color="#FFCC7A" fillcolor="#FFF6D9" shape=Mdiamond style=filled]
+		nest0_1 [label="Integration Testing" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+		nest0_2 [label="Operating System Development" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="manages data structures" color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="implements security" color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="designs APIs" color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N6 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [label="builds backends" color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label="manages databases" color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_218.txt b/test/graphviz/scanned_hard/graphviz_218.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6ce1ab0e3a55741957a40a8afa3073361d4b9a7e
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_218.txt
@@ -0,0 +1,22 @@
+<API Development, connectedTo, Integration Testing>
+<API Development, gathers requirements, Requirements Gathering>
+<Algorithm Design, integrates modules, Security Hardening>
+<Algorithm Design, partOf, Algorithm Design>
+<Cloud_Native Development, codes features, API Development>
+<Coding, connectedTo, Frontend Development>
+<Coding, designs algorithms, Scalability Design>
+<Containerization, partOf, Containerization>
+<Containerization, writes unit tests, Algorithm Design>
+<Deployment, connectedTo, Cloud_Native Development>
+<Documentation, connectedTo, API Development>
+<Documentation, connectedTo, Cloud_Native Development>
+<Documentation, connectedTo, Deployment>
+<Documentation, connectedTo, Security Hardening>
+<Frontend Development, connectedTo, Mobile Application Development>
+<Mobile Application Development, connectedTo, Documentation>
+<Requirements Gathering, implements CI, Containerization>
+<Requirements Gathering, partOf, Requirements Gathering>
+<Scalability Design, connectedTo, Frontend Development>
+<Security Hardening, connectedTo, Deployment>
+<User Interface Design, builds microservices, Coding>
+<User Interface Design, develops embedded systems, Frontend Development>
diff --git a/test/graphviz/scanned_hard/graphviz_219.txt b/test/graphviz/scanned_hard/graphviz_219.txt
new file mode 100644
index 0000000000000000000000000000000000000000..222cf5fdb71a2f2354a2a6ba09ec67247d56fbc5
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_219.txt
@@ -0,0 +1,18 @@
+<API Development, connectedTo, Microservices Architecture>
+<Architecture Planning, connectedTo, Data Structures Implementation>
+<Architecture Planning, partOf, Architecture Planning>
+<Containerization, integrates modules, API Development>
+<Containerization, uses frameworks, Web Application Development>
+<Data Structures Implementation, tests systems, Cloud_Native Development>
+<Game Development, connectedTo, Web Application Development>
+<Game Development, develops web apps, API Development>
+<Game Development, writes documentation, Containerization>
+<Integration Testing, connectedTo, Data Structures Implementation>
+<Integration Testing, connectedTo, Game Development>
+<Integration Testing, connectedTo, Web Application Development>
+<Integration Testing, fixes bugs, Web Application Development>
+<Microservices Architecture, connectedTo, Data Structures Implementation>
+<Refactoring, deploys applications, Architecture Planning>
+<Refactoring, partOf, Refactoring>
+<Web Application Development, connectedTo, API Development>
+<Web Application Development, connectedTo, Refactoring>
diff --git a/test/graphviz/scanned_hard/graphviz_22.txt b/test/graphviz/scanned_hard/graphviz_22.txt
new file mode 100644
index 0000000000000000000000000000000000000000..da1e47c41166784e5f365e1c79dfd4f27ff9fbf4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_22.txt
@@ -0,0 +1,10 @@
+<Access Control, connectedTo, Threat Intelligence Gathering>
+<Dark Web Monitoring, connectedTo, Phishing Simulation>
+<Digital Forensics, connectedTo, Dark Web Monitoring>
+<Identity Management, connectedTo, Compliance Monitoring>
+<Phishing Simulation, isolates, Security Awareness Training>
+<Security Awareness Training, connectedTo, Compliance Monitoring>
+<Security Awareness Training, connectedTo, Threat Detection>
+<Threat Detection, responds, Identity Management>
+<Threat Intelligence Gathering, audits, Vulnerability Assessment>
+<Vulnerability Assessment, governs, Digital Forensics>
diff --git a/test/graphviz/scanned_hard/graphviz_220.txt b/test/graphviz/scanned_hard/graphviz_220.txt
new file mode 100644
index 0000000000000000000000000000000000000000..92998fcd0fe3eef3dbbd8a760263147d44190e86
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_220.txt
@@ -0,0 +1,21 @@
+<Assembly Line Optimization, designs fixtures, High_Speed Digital Design>
+<Circuit Design, designs circuits, Intellectual Property Protection>
+<Circuit Design, designs mixed_signal, Assembly Line Optimization>
+<Documentation, connectedTo, Prototyping>
+<Documentation, partOf, Documentation>
+<High_Speed Digital Design, connectedTo, Power Management Design>
+<Intellectual Property Protection, connectedTo, Troubleshooting and Debugging>
+<Intellectual Property Protection, partOf, Intellectual Property Protection>
+<Mechanical Design Integration, connectedTo, Power Integrity Analysis>
+<Microcontroller Programming, connectedTo, PCB Layout>
+<Optical Module Design, connectedTo, Testing and Validation>
+<PCB Layout, connectedTo, Prototyping>
+<Power Management Design, analyzes failures, Power Integrity Analysis>
+<Power Management Design, connectedTo, Mechanical Design Integration>
+<Power Management Design, connectedTo, Testing and Validation>
+<Power Management Design, manages EMC, Optical Module Design>
+<Prototyping, connectedTo, Circuit Design>
+<Prototyping, connectedTo, Testing and Validation>
+<Testing and Validation, connectedTo, Mechanical Design Integration>
+<Troubleshooting and Debugging, connectedTo, Documentation>
+<Troubleshooting and Debugging, partOf, Troubleshooting and Debugging>
diff --git a/test/graphviz/scanned_hard/graphviz_221.dot b/test/graphviz/scanned_hard/graphviz_221.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d52b0dfb220fbc446e6758fe4ae01e07873c57cb
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_221.dot
@@ -0,0 +1,50 @@
+digraph {
+	rankdir=BT
+	N0 [label="Firmware Development" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N1 [label=Documentation color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N2 [label="Power Management Design" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N3 [label="Supply Chain Management for Components" color="#795548" fillcolor="#D7CCC8" shape=folder style=filled]
+	N4 [label="Assembly Line Optimization" color="#CD8FF2" fillcolor="#ECCFF5" shape=hexagon style=filled]
+	N5 [label="Circuit Design" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N6 [label="Cost Optimization" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N7 [label="Schematic Capture" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N8 [label="Thermal Management" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N9 [label=Prototyping color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N10 [label="ASIC Design" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N11 [label="Low_Power Design" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N12 [label="Environmental Testing" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N13 [label="High_Speed Digital Design" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N14 [label="Power Integrity Analysis" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N15 [label="Quality Control" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Microcontroller Programming" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Troubleshooting and Debugging" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+		nest0_1 [label="Mechanical Design Integration" color="#CD8FF2" fillcolor="#ECCFF5" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label="tests environmental resilience" color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="analyzes thermals" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="designs fixtures" color="#795548" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [label="troubleshoots issues" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [label="controls actuators" color="#795548" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N12 [label="creates documentation" color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [label="performs reverse engineering" color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_0 -> N10 [label="optimizes costs" color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N15 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N11 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_225.txt b/test/graphviz/scanned_hard/graphviz_225.txt
new file mode 100644
index 0000000000000000000000000000000000000000..69958c7265275951fb37bb3360edfb40562efaaf
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_225.txt
@@ -0,0 +1,26 @@
+<AR or VR Features in Mobile, conducts tests, Security Implementation>
+<Accessibility Features, connectedTo, Concept Development>
+<Backend Integration, connectedTo, Accessibility Features>
+<Biometric Authentication, connectedTo, AR or VR Features in Mobile>
+<Biometric Authentication, integrates ads, IoT Device Control via App>
+<Crash Reporting, connectedTo, Payment Gateway Integration>
+<Crash Reporting, partOf, Crash Reporting>
+<Cross_Platform Development, develops AR or VR features, Gamification Elements>
+<Gamification Elements, connectedTo, Biometric Authentication>
+<Gamification Elements, connectedTo, Security Implementation>
+<IoT Device Control via App, designs onboarding, Backend Integration>
+<Microphone Integration, connectedTo, Testing and Debugging>
+<Microphone Integration, partOf, Microphone Integration>
+<Payment Gateway Integration, connectedTo, AR or VR Features in Mobile>
+<Payment Gateway Integration, connectedTo, Biometric Authentication>
+<Payment Gateway Integration, connectedTo, Microphone Integration>
+<Payment Gateway Integration, connectedTo, Security Implementation>
+<Payment Gateway Integration, monitors crashes, Cross_Platform Development>
+<Payment Gateway Integration, optimizes performance, IoT Device Control via App>
+<Prototyping, partOf, Prototyping>
+<Prototyping, uses microphone, Crash Reporting>
+<Security Implementation, connectedTo, Updates and Maintenance>
+<Testing and Debugging, connectedTo, Prototyping>
+<Testing and Debugging, partOf, Testing and Debugging>
+<Updates and Maintenance, connectedTo, IoT Device Control via App>
+<User Interface Design, connectedTo, Payment Gateway Integration>
diff --git a/test/graphviz/scanned_hard/graphviz_226.dot b/test/graphviz/scanned_hard/graphviz_226.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c8be90c415af2236b65ff821bedbd72a5cf0df8b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_226.dot
@@ -0,0 +1,54 @@
+digraph {
+	rankdir=TD
+	N0 [label="Reputation Management" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Live Streaming on Social Media" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N2 [label="Reels or Short Video Production" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N3 [label="Reporting and Optimization" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N4 [label="Social Listening" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N5 [label="Performance Analytics" color="#FBC02D" fillcolor="#FFFDE7" shape=octagon style=filled]
+	N6 [label="Emerging Platform Exploration" color="#FFDA4E" fillcolor="#FFE88D" shape=folder style=filled]
+	N7 [label=Cross_Promotion color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N8 [label="Polls and Quizzes Creation" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N9 [label="Brand Voice Development" color="#FBC02D" fillcolor="#FFFDE7" shape=plaintext style=filled]
+	N10 [label="Ethical Use of Social Media" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N11 [label="Hashtag Research" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	S0 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Direct Messaging Strategy" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Group Management" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_1 [label="Audience Engagement" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_2 [label="Content Moderation" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+		nest0_3 [label="Link_in_Bio Optimization" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [label="measures reach" color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label="creates stories" color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [label="builds reputation" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [label="monitors competitors" color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [label="creates content" color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_228.dot b/test/graphviz/scanned_hard/graphviz_228.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8e680dd0436f6d891d41821be191102e6ea3070f
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_228.dot
@@ -0,0 +1,56 @@
+digraph {
+	rankdir=BT
+	N0 [label="Content Moderation" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N1 [label="Trend Monitoring" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N2 [label="Crisis Communication Plan" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N3 [label="Campaign Management" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N4 [label="Performance Analytics" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N5 [label="Reputation Management" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N6 [label="User_Generated Content Curation" color="#FFE470" fillcolor="#FFFAE0" shape=plaintext style=filled]
+	N7 [label="Live Streaming on Social Media" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N8 [label="Link_in_Bio Optimization" color="#FFF9AE" fillcolor="#FFFCE6" shape=Mdiamond style=filled]
+	N9 [label="Competitor Analysis" color="#388E3C" fillcolor="#F1F8E9" shape=Mdiamond style=filled]
+	N10 [label="Polls and Quizzes Creation" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N11 [label="Direct Messaging Strategy" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N12 [label="Reels or Short Video Production" color="#FFF9AE" fillcolor="#FFFCE6" shape=octagon style=filled]
+	N13 [label="Partnership Management on Social" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	S0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Social Media Audits" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Customer Service on Social Media" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest0_1 [label="Platform Selection" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [label="shares links" color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="manages profiles" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="monitors competitors" color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label="runs ads" color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label="manages campaigns" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N8 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [label="hosts live streams" color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N8 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label="cross_promotes content" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N12 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [label="builds reputation" color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [label="schedules posts" color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_228.txt b/test/graphviz/scanned_hard/graphviz_228.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d499d0fa41892e898d6dd86f82978b9a8fa7c93a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_228.txt
@@ -0,0 +1,27 @@
+<Campaign Management, connectedTo, Performance Analytics>
+<Competitor Analysis, connectedTo, Customer Service on Social Media>
+<Competitor Analysis, runs ads, Polls and Quizzes Creation>
+<Content Moderation, connectedTo, Campaign Management>
+<Content Moderation, connectedTo, Competitor Analysis>
+<Content Moderation, connectedTo, Partnership Management on Social>
+<Content Moderation, connectedTo, Trend Monitoring>
+<Crisis Communication Plan, connectedTo, Performance Analytics>
+<Crisis Communication Plan, hosts live streams, Partnership Management on Social>
+<Crisis Communication Plan, monitors competitors, Campaign Management>
+<Customer Service on Social Media, partOf, Customer Service on Social Media>
+<Customer Service on Social Media, shares links, Platform Selection>
+<Direct Messaging Strategy, connectedTo, Reels or Short Video Production>
+<Link_in_Bio Optimization, connectedTo, Competitor Analysis>
+<Link_in_Bio Optimization, connectedTo, Reels or Short Video Production>
+<Live Streaming on Social Media, connectedTo, Link_in_Bio Optimization>
+<Performance Analytics, connectedTo, Reputation Management>
+<Platform Selection, connectedTo, Link_in_Bio Optimization>
+<Platform Selection, partOf, Platform Selection>
+<Polls and Quizzes Creation, manages campaigns, Direct Messaging Strategy>
+<Reels or Short Video Production, connectedTo, Partnership Management on Social>
+<Reputation Management, builds reputation, Live Streaming on Social Media>
+<Reputation Management, connectedTo, User_Generated Content Curation>
+<Trend Monitoring, cross_promotes content, Reels or Short Video Production>
+<Trend Monitoring, manages profiles, Crisis Communication Plan>
+<Trend Monitoring, schedules posts, Live Streaming on Social Media>
+<User_Generated Content Curation, connectedTo, Live Streaming on Social Media>
diff --git a/test/graphviz/scanned_hard/graphviz_23.txt b/test/graphviz/scanned_hard/graphviz_23.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1e8ea4815125425fcb6466bff77fd03a65352abf
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_23.txt
@@ -0,0 +1,12 @@
+<Device Pairing, controls, Pet Feeder Automation>
+<Door Lock Management, adapts, Remote Control>
+<Door Lock Management, measures, Air Quality Monitoring>
+<Doorbell Camera Alert, connectedTo, Elderly Care Monitoring>
+<Elderly Care Monitoring, connectedTo, Motion Detection>
+<Firmware Update, connectedTo, Doorbell Camera Alert>
+<Firmware Update, records, Air Quality Monitoring>
+<Motion Detection, connectedTo, Scene Creation>
+<Pet Feeder Automation, entertains, Firmware Update>
+<Remote Control, streams, Smart Plug Management>
+<Scene Creation, installs, Remote Control>
+<Smart Plug Management, communicates, Door Lock Management>
diff --git a/test/graphviz/scanned_hard/graphviz_230.dot b/test/graphviz/scanned_hard/graphviz_230.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f58931d335e9a8c1410d277c70edb5760f37d3b4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_230.dot
@@ -0,0 +1,45 @@
+digraph {
+	rankdir=RL
+	N0 [label="User Intent Understanding" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Featured Snippets Optimization" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N2 [label="Google Analytics Integration" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N3 [label="Paid Search Advertising" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N4 [label="Schema Markup Implementation" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N5 [label="Negative SEO Prevention" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N6 [label="Keyword Research" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N7 [label="Click_Through Rate Optimization" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N8 [label="Penalties Recovery" color="#DCE775" fillcolor="#F9FBE7" shape=plaintext style=filled]
+	N9 [label="Image Search" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	S0 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Crawling Websites" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Ranking Algorithms" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+		nest0_1 [label="Technical SEO" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_2 [label="Core Web Vitals Optimization" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="analyzes competitors" color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label="ranks results" color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="indexes content" color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [label="displays snippets" color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label="manages SEM" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label="improves core vitals" color="#E57373" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_230.txt b/test/graphviz/scanned_hard/graphviz_230.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cd863426455e6b4636eef818f4579ad1ca6e1fa3
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_230.txt
@@ -0,0 +1,22 @@
+<Click_Through Rate Optimization, indexes content, Penalties Recovery>
+<Core Web Vitals Optimization, connectedTo, Keyword Research>
+<Core Web Vitals Optimization, partOf, Core Web Vitals Optimization>
+<Featured Snippets Optimization, connectedTo, Google Analytics Integration>
+<Featured Snippets Optimization, manages SEM, Keyword Research>
+<Google Analytics Integration, analyzes competitors, Paid Search Advertising>
+<Keyword Research, connectedTo, Click_Through Rate Optimization>
+<Negative SEO Prevention, ranks results, Keyword Research>
+<Paid Search Advertising, connectedTo, Schema Markup Implementation>
+<Penalties Recovery, connectedTo, Image Search>
+<Ranking Algorithms, connectedTo, Technical SEO>
+<Ranking Algorithms, partOf, Ranking Algorithms>
+<Schema Markup Implementation, connectedTo, Image Search>
+<Schema Markup Implementation, connectedTo, Negative SEO Prevention>
+<Schema Markup Implementation, connectedTo, Penalties Recovery>
+<Schema Markup Implementation, connectedTo, Ranking Algorithms>
+<Technical SEO, connectedTo, Core Web Vitals Optimization>
+<Technical SEO, partOf, Technical SEO>
+<User Intent Understanding, connectedTo, Featured Snippets Optimization>
+<User Intent Understanding, connectedTo, Negative SEO Prevention>
+<User Intent Understanding, displays snippets, Click_Through Rate Optimization>
+<User Intent Understanding, improves core vitals, Keyword Research>
diff --git a/test/graphviz/scanned_hard/graphviz_231.dot b/test/graphviz/scanned_hard/graphviz_231.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2ab9a55b063d22745498e123135f96201af01c2a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_231.dot
@@ -0,0 +1,37 @@
+digraph {
+	rankdir=BT
+	N0 [label="Negative SEO Prevention" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Competitor Keyword Analysis" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N2 [label="Search Console Management" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+	N3 [label="Video Search" color="#6EB76D" fillcolor="#E9F7E8" shape=Mdiamond style=filled]
+	N4 [label="Personalized Search Results" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N5 [label="User Experience for Search" color="#26A69A" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N6 [label="Ranking Algorithms" color="#26A69A" fillcolor="#E0F2F1" shape=plaintext style=filled]
+	N7 [label="Penalties Recovery" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	S0 [label="" color="#6EB76D" fillcolor="#E9F7E8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Core Web Vitals Optimization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Search Engine Optimization" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+		nest0_1 [label="News Search" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest0_2 [label="Click_Through Rate Optimization" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="indexes academic papers" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label="processes updates" color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="understands intent" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N4 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [label="manages SEM" color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_232.dot b/test/graphviz/scanned_hard/graphviz_232.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a3e79b6185f95c0e633f03b0917e9d86fc2e79f5
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_232.dot
@@ -0,0 +1,37 @@
+digraph {
+	rankdir=TD
+	N0 [label="Privileged Access Management" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N1 [label="Data Minimization Principles" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+	N2 [label="Biometric Authentication" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N3 [label=De_provisioning color="#CFCFCF" fillcolor="#F6F6F6" shape=plaintext style=filled]
+	N4 [label="Identity Lifecycle Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N5 [label="Digital Signatures" color="#E91E63" fillcolor="#F8BBD0" shape=octagon style=filled]
+	N6 [label="Risk_Based Authentication" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N7 [label="Attribute Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Identity Proofing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Multi_Factor Authentication" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+		nest0_1 [label="Password Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=plaintext style=filled]
+		nest0_2 [label="Single Sign_On" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label="implements DIDs" color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="de_provisions users" color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label="integrates social logins" color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label="ensures non_repudiation" color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N4 [label="uses biometrics" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_232.txt b/test/graphviz/scanned_hard/graphviz_232.txt
new file mode 100644
index 0000000000000000000000000000000000000000..998a9bde5215ab7965462e2abd98eeb767079af4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_232.txt
@@ -0,0 +1,18 @@
+<Biometric Authentication, de_provisions users, De_provisioning>
+<Data Minimization Principles, connectedTo, Biometric Authentication>
+<De_provisioning, connectedTo, Attribute Management>
+<De_provisioning, connectedTo, Identity Lifecycle Management>
+<De_provisioning, connectedTo, Risk_Based Authentication>
+<Digital Signatures, connectedTo, Multi_Factor Authentication>
+<Digital Signatures, ensures non_repudiation, Risk_Based Authentication>
+<Identity Lifecycle Management, connectedTo, Attribute Management>
+<Identity Lifecycle Management, connectedTo, Risk_Based Authentication>
+<Identity Lifecycle Management, integrates social logins, Digital Signatures>
+<Multi_Factor Authentication, connectedTo, Password Management>
+<Multi_Factor Authentication, partOf, Multi_Factor Authentication>
+<Password Management, implements DIDs, Single Sign_On>
+<Password Management, partOf, Password Management>
+<Privileged Access Management, connectedTo, Data Minimization Principles>
+<Risk_Based Authentication, connectedTo, Attribute Management>
+<Single Sign_On, partOf, Single Sign_On>
+<Single Sign_On, uses biometrics, Identity Lifecycle Management>
diff --git a/test/graphviz/scanned_hard/graphviz_234.dot b/test/graphviz/scanned_hard/graphviz_234.dot
new file mode 100644
index 0000000000000000000000000000000000000000..628d2b9d4e97801c22c159816c777962c6391823
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_234.dot
@@ -0,0 +1,42 @@
+digraph {
+	rankdir=BT
+	N0 [label="Attribute Management" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N1 [label="Social Login Integration" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N2 [label="Customer Identity and Access Management" color="#BA68C8" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N3 [label="Access Governance" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+	N4 [label="Decentralized Identifiers" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+	N5 [label="API Security for Identity" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N6 [label="Credential Management" color="#BA68C8" fillcolor="#F3E5F5" shape=plaintext style=filled]
+	N7 [label="Password Management" color="#AABEC6" fillcolor="#E0E6E9" shape=plaintext style=filled]
+	N8 [label="Identity Verification" color="#BA68C8" fillcolor="#F3E5F5" shape=octagon style=filled]
+	N9 [label="Workforce Identity Management" color="#BA68C8" fillcolor="#F3E5F5" shape=folder style=filled]
+	N10 [label="Identity as a Service" color="#AABEC6" fillcolor="#E0E6E9" shape=hexagon style=filled]
+	N11 [label="Risk_Based Authentication" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	S0 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Data Minimization Principles" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Digital Wallets for Identity" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+		nest0_1 [label="Privacy Management" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+		nest0_2 [label="Federated Identity Management" color="#9C27B0" fillcolor="#E1BEE7" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label="implements PAM" color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="implements adaptive authentication" color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="uses digital signatures" color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label="authorizes access" color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N1 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [label="creates portable identities" color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [label="ensures compliance" color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_234.txt b/test/graphviz/scanned_hard/graphviz_234.txt
new file mode 100644
index 0000000000000000000000000000000000000000..34c855b3dcc071a004578f62a196a891350ed33b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_234.txt
@@ -0,0 +1,21 @@
+<API Security for Identity, connectedTo, Credential Management>
+<Access Governance, connectedTo, Decentralized Identifiers>
+<Access Governance, connectedTo, Password Management>
+<Access Governance, creates portable identities, Identity as a Service>
+<Attribute Management, implements PAM, Social Login Integration>
+<Credential Management, connectedTo, Digital Wallets for Identity>
+<Credential Management, uses digital signatures, Password Management>
+<Customer Identity and Access Management, connectedTo, Access Governance>
+<Decentralized Identifiers, implements adaptive authentication, API Security for Identity>
+<Digital Wallets for Identity, connectedTo, Privacy Management>
+<Digital Wallets for Identity, partOf, Digital Wallets for Identity>
+<Federated Identity Management, connectedTo, Social Login Integration>
+<Federated Identity Management, ensures compliance, Decentralized Identifiers>
+<Federated Identity Management, partOf, Federated Identity Management>
+<Identity Verification, connectedTo, Workforce Identity Management>
+<Identity as a Service, connectedTo, Risk_Based Authentication>
+<Password Management, connectedTo, Identity Verification>
+<Privacy Management, connectedTo, Federated Identity Management>
+<Privacy Management, partOf, Privacy Management>
+<Social Login Integration, connectedTo, Customer Identity and Access Management>
+<Workforce Identity Management, authorizes access, Identity as a Service>
diff --git a/test/graphviz/scanned_hard/graphviz_235.txt b/test/graphviz/scanned_hard/graphviz_235.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d84d76644cc6337d1652f8f67315cc8ffe1af017
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_235.txt
@@ -0,0 +1,19 @@
+<Adaptive Learning Technologies, connectedTo, Blended Learning Models>
+<Adaptive Learning Technologies, connectedTo, Virtual Labs and Simulations>
+<Adaptive Learning Technologies, secures platforms, Enrollment and Retention Strategies>
+<Asynchronous Learning, connectedTo, Interactive Learning Activities>
+<Blended Learning Models, develops platforms, Asynchronous Learning>
+<Bootcamp Development, connectedTo, Course Evaluation>
+<Enrollment and Retention Strategies, connectedTo, Bootcamp Development>
+<Feedback and Grading, connectedTo, Enrollment and Retention Strategies>
+<Feedback and Grading, partOf, Feedback and Grading>
+<Interactive Learning Activities, provides digital textbooks, Enrollment and Retention Strategies>
+<Language Learning Platforms, connectedTo, Enrollment and Retention Strategies>
+<Language Learning Platforms, connectedTo, Student Engagement Strategies>
+<Peer_to_Peer Learning, connectedTo, Language Learning Platforms>
+<Student Engagement Strategies, connectedTo, Synchronous Learning>
+<Synchronous Learning, connectedTo, Adaptive Learning Technologies>
+<Synchronous Learning, connectedTo, Blended Learning Models>
+<Synchronous Learning, connectedTo, Enrollment and Retention Strategies>
+<Virtual Labs and Simulations, engages parents, Feedback and Grading>
+<Virtual Labs and Simulations, partOf, Virtual Labs and Simulations>
diff --git a/test/graphviz/scanned_hard/graphviz_236.dot b/test/graphviz/scanned_hard/graphviz_236.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4f98a6e6336e7ecf7cd1ed1307a037e45a037e5d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_236.dot
@@ -0,0 +1,40 @@
+digraph {
+	rankdir=RL
+	N0 [label="Course Evaluation" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N1 [label="Enrollment and Retention Strategies" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+	N2 [label="Asynchronous Learning" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N3 [label="Collaborative Projects" color="#BA68C8" fillcolor="#F3E5F5" shape=octagon style=filled]
+	N4 [label="Discussion Forum Moderation" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N5 [label="Virtual Labs and Simulations" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+	N6 [label="Accreditation Management" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+	N7 [label="Assessment Design" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N8 [label="Bootcamp Development" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
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+		nest0_1 [label="Gamification in Education" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+		nest0_2 [label="Peer_to_Peer Learning" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label="manages student info" color="#BA68C8" dir=forward penwidth=1.5 style=solid]
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+	N7 -> N8 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
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+	nest0_2 -> N4 [label="supports SEL" color="#000000" dir=forward penwidth=1.5 style=solid]
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+	S0 -> N6 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [label="offers professional development" color="#000000" dir=forward penwidth=1.5 style=solid]
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+}
diff --git a/test/graphviz/scanned_hard/graphviz_237.txt b/test/graphviz/scanned_hard/graphviz_237.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e94330363ec341db13f00762e0cb42673c7b99fd
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_237.txt
@@ -0,0 +1,22 @@
+<AI in Online Education, connectedTo, Enrollment and Retention Strategies>
+<Accessibility Features, connectedTo, Course Design>
+<Accreditation Management, connectedTo, Adaptive Learning Technologies>
+<Accreditation Management, connectedTo, Personalized Learning Paths>
+<Accreditation Management, connectedTo, Test Preparation Courses>
+<Accreditation Management, develops platforms, Professional Development Courses>
+<Adaptive Learning Technologies, manages enrollments, AI in Online Education>
+<Blended Learning Models, connectedTo, Feedback and Grading>
+<Competency_Based Education, analyzes learning data, Accessibility Features>
+<Competency_Based Education, uses machine learning, Content Creation>
+<Content Creation, provides digital textbooks, Accreditation Management>
+<Course Design, connectedTo, Blended Learning Models>
+<Digital Badges, partOf, Digital Badges>
+<Digital Badges, provides OER, Accessibility Features>
+<Enrollment and Retention Strategies, connectedTo, Test Preparation Courses>
+<Personalized Learning Paths, connectedTo, Adaptive Learning Technologies>
+<Professional Development Courses, connectedTo, Digital Badges>
+<Professional Development Courses, partOf, Professional Development Courses>
+<Student Progress Tracking, connectedTo, Accessibility Features>
+<Test Preparation Courses, connectedTo, AI in Online Education>
+<Test Preparation Courses, connectedTo, Accessibility Features>
+<Test Preparation Courses, connectedTo, Student Progress Tracking>
diff --git a/test/graphviz/scanned_hard/graphviz_238.dot b/test/graphviz/scanned_hard/graphviz_238.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e0f238e3dd87aa9ab3d58b6747a680d7a0a6d58a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_238.dot
@@ -0,0 +1,40 @@
+digraph {
+	rankdir=TD
+	N0 [label="Course Audit Options" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N1 [label="Corporate Training Solutions" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N2 [label="Marketing to Global Audience" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N3 [label="Research on MOOC Effectiveness" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N4 [label="Learner Feedback Analysis" color="#66BB6A" fillcolor="#E8F5E9" shape=Mdiamond style=filled]
+	N5 [label="Technical Infrastructure for Scale" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N6 [label="Mobile Learning Experience" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N7 [label="Completion Rate Optimization" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
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diff --git a/test/graphviz/scanned_hard/graphviz_239.dot b/test/graphviz/scanned_hard/graphviz_239.dot
new file mode 100644
index 0000000000000000000000000000000000000000..59b925d8c6ed79db59012673f53cf1c916914b46
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_239.dot
@@ -0,0 +1,47 @@
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+	S1 -> N8 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_239.txt b/test/graphviz/scanned_hard/graphviz_239.txt
new file mode 100644
index 0000000000000000000000000000000000000000..76c09d96c504aed4e5f1377d6022590dc8f3aba0
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_239.txt
@@ -0,0 +1,24 @@
+<Completion Rate Optimization, connectedTo, Course Audit Options>
+<Completion Rate Optimization, provides readings, Subscription Models>
+<Corporate Training Solutions, connectedTo, Gamification for Engagement>
+<Corporate Training Solutions, partOf, Corporate Training Solutions>
+<Course Audit Options, analyzes data, Learner Feedback Analysis>
+<Course Audit Options, connectedTo, Financial Aid for Learners>
+<Course Audit Options, issues statements of accomplishment, Course Promotion>
+<Course Promotion, connectedTo, Employer Recognition>
+<Course Promotion, connectedTo, Instructor_Led Sessions>
+<Course Promotion, delivers lectures, Learner Feedback Analysis>
+<Employer Recognition, connectedTo, Instructor_Led Sessions>
+<Gamification for Engagement, partOf, Gamification for Engagement>
+<Gamification for Engagement, supports diverse learners, Micro_credential Stacking>
+<Instructor_Led Sessions, manages instructors, Financial Aid for Learners>
+<Learner Analytics, connectedTo, Marketing to Global Audience>
+<Learner Feedback Analysis, connectedTo, Employer Recognition>
+<Marketing to Global Audience, connectedTo, Completion Rate Optimization>
+<Marketing to Global Audience, connectedTo, Course Audit Options>
+<Marketing to Global Audience, secures data, Corporate Training Solutions>
+<Micro_credential Stacking, connectedTo, Translation and Localization>
+<Micro_credential Stacking, partOf, Micro_credential Stacking>
+<Subscription Models, updates content, Course Audit Options>
+<Translation and Localization, connectedTo, Marketing to Global Audience>
+<Translation and Localization, partOf, Translation and Localization>
diff --git a/test/graphviz/scanned_hard/graphviz_24.txt b/test/graphviz/scanned_hard/graphviz_24.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8747c6b82cc1c85d646741e7046fec247841667a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_24.txt
@@ -0,0 +1,10 @@
+<City_wide Sensor Network Deployment, audits, Environmental Sensor Network>
+<Data Privacy Protection, connectedTo, Waste Management Optimization>
+<Energy Grid Management, connectedTo, Data Privacy Protection>
+<Environmental Sensor Network, regulates, Smart Building Integration>
+<Smart Building Integration, predicts, Smart Education Initiatives>
+<Smart Education Initiatives, connects, City_wide Sensor Network Deployment>
+<Smart Lighting, connectedTo, Traffic Flow Optimization>
+<Traffic Flow Optimization, connectedTo, Environmental Sensor Network>
+<Waste Management Optimization, routes, Waste Recycling Program>
+<Waste Recycling Program, connectedTo, Smart Lighting>
diff --git a/test/graphviz/scanned_hard/graphviz_240.dot b/test/graphviz/scanned_hard/graphviz_240.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9a581287ad259216b1b557c756dcfd069b260c37
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_240.dot
@@ -0,0 +1,45 @@
+digraph {
+	rankdir=RL
+	N0 [label="Continuous Course Improvement" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N1 [label="University Partnerships" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N2 [label="Technical Infrastructure for Scale" color="#FBC02D" fillcolor="#FFFDE7" shape=oval style=filled]
+	N3 [label="Specialization or Professional Certificate Programs" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N4 [label="Instructor Recruitment for MOOCs" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N5 [label="Learner Feedback Analysis" color="#FFE470" fillcolor="#FFFAE0" shape=oval style=filled]
+	N6 [label="Course Promotion" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N7 [label="Financial Aid for Learners" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N8 [label="Industry Collaboration for Content" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N9 [label="Discussion Forum Management" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N10 [label="Verified Track Management" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N11 [label="Mobile Learning Experience" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N12 [label="Global Accessibility Features" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Course Retirement Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Course Audit Options" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+		nest0_1 [label="Course Content Development" color="#FFE470" fillcolor="#FFFAE0" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="updates content" color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label="provides readings" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label="provides technical support" color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label="complies with regulations" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N1 [label="offers pathways" color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [label="supports diverse learners" color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_240.txt b/test/graphviz/scanned_hard/graphviz_240.txt
new file mode 100644
index 0000000000000000000000000000000000000000..38477e3f21d57dcd9320271fd41a1f923fde7c86
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_240.txt
@@ -0,0 +1,21 @@
+<Continuous Course Improvement, connectedTo, University Partnerships>
+<Course Audit Options, connectedTo, Course Content Development>
+<Course Audit Options, partOf, Course Audit Options>
+<Course Content Development, offers pathways, University Partnerships>
+<Course Content Development, partOf, Course Content Development>
+<Course Promotion, provides readings, Financial Aid for Learners>
+<Discussion Forum Management, connectedTo, Verified Track Management>
+<Financial Aid for Learners, connectedTo, Course Audit Options>
+<Financial Aid for Learners, connectedTo, Industry Collaboration for Content>
+<Industry Collaboration for Content, provides technical support, Discussion Forum Management>
+<Instructor Recruitment for MOOCs, connectedTo, Learner Feedback Analysis>
+<Learner Feedback Analysis, connectedTo, Course Promotion>
+<Mobile Learning Experience, complies with regulations, Global Accessibility Features>
+<Specialization or Professional Certificate Programs, connectedTo, Instructor Recruitment for MOOCs>
+<Specialization or Professional Certificate Programs, connectedTo, Learner Feedback Analysis>
+<Specialization or Professional Certificate Programs, connectedTo, Verified Track Management>
+<Specialization or Professional Certificate Programs, supports diverse learners, Course Promotion>
+<Technical Infrastructure for Scale, connectedTo, Course Promotion>
+<Technical Infrastructure for Scale, updates content, Specialization or Professional Certificate Programs>
+<University Partnerships, connectedTo, Technical Infrastructure for Scale>
+<Verified Track Management, connectedTo, Mobile Learning Experience>
diff --git a/test/graphviz/scanned_hard/graphviz_241.dot b/test/graphviz/scanned_hard/graphviz_241.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7c888c8192707a6a20145837e1fd60565a993d5c
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_241.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=RL
+	N0 [label="Loan Processing" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N1 [label="Risk Assessment" color="#FFEB3B" fillcolor="#FFF9C4" shape=Mdiamond style=filled]
+	N2 [label="Forex Trading" color="#FFEB3B" fillcolor="#FFF9C4" shape=octagon style=filled]
+	N3 [label="Approval Decision" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N4 [label="Financial Reporting" color="#A1887F" fillcolor="#EFEBE9" shape=Mdiamond style=filled]
+	N5 [label="Collateral Evaluation" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N6 [label="Customer Onboarding" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N7 [label="Credit Scoring" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+	N8 [label="Fraud Check" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N9 [label="Credit Card Application" color="#64B5F6" fillcolor="#E3F2FD" shape=plaintext style=filled]
+	N10 [label="Dispute Resolution" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N11 [label="Mortgage Application" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N12 [label="Portfolio Management" color="#A1887F" fillcolor="#EFEBE9" shape=oval style=filled]
+	N13 [label="Market Analysis" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N14 [label="Merger and Acquisition" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	S0 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Blockchain Verification" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Budgeting Analysis" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+		nest0_1 [label="Debt Collection" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+		nest0_2 [label="Payment Gateway Integration" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest0_3 [label="Treasury Management" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=manages color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Interest Calculation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Compliance Review" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest1_1 [label="Asset Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest1_2 [label="Tax Preparation" color="#A1887F" fillcolor="#EFEBE9" shape=diamond style=filled]
+		nest1_3 [label="Wealth Management" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [label=reports color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=calculates color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest0_0 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N7 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [label=rejects color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N5 [label=models color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_244.txt b/test/graphviz/scanned_hard/graphviz_244.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7545962345c3a93727f1f8387b50c46d612824aa
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_244.txt
@@ -0,0 +1,45 @@
+<Advisory Committee Meeting, connectedTo, School Accreditation>
+<Advisory Committee Meeting, connectedTo, Timetable Scheduling>
+<Alumni Network Management, connectedTo, Graduation Approval>
+<Alumni Network Management, updates, Disciplinary Action>
+<Attendance Tracking, connectedTo, Student Enrollment>
+<Attendance Tracking, partOf, Attendance Tracking>
+<Career Services, connectedTo, Advisory Committee Meeting>
+<Career Services, connectedTo, Lecture Delivery>
+<Career Services, connectedTo, Timetable Scheduling>
+<Counseling Session, connectedTo, Alumni Network Management>
+<Course Material Preparation, connectedTo, Special Education Support>
+<Course Selection, issues, Attendance Tracking>
+<Course Selection, partOf, Course Selection>
+<Disciplinary Action, connectedTo, Research Grant Application>
+<Exam Conduct, connectedTo, Internship Coordination>
+<Graduation Approval, connectedTo, Advisory Committee Meeting>
+<Graduation Approval, connectedTo, Course Selection>
+<Graduation Approval, reports, Career Services>
+<Internship Coordination, connectedTo, Advisory Committee Meeting>
+<Internship Coordination, connectedTo, Course Material Preparation>
+<Internship Coordination, connectedTo, Graduation Approval>
+<Lecture Delivery, approves, Library Registration>
+<Parent_Teacher Conference, connectedTo, Student Application>
+<Parent_Teacher Conference, partOf, Parent_Teacher Conference>
+<Research Grant Application, connectedTo, Advisory Committee Meeting>
+<Research Grant Application, connectedTo, Career Services>
+<Research Grant Application, connectedTo, Graduation Approval>
+<Research Grant Application, connectedTo, Lecture Delivery>
+<Research Grant Application, connectedTo, Timetable Scheduling>
+<Research Grant Application, connectedTo, Transcript Issuance>
+<Result Declaration, connectedTo, Advisory Committee Meeting>
+<Result Declaration, connectedTo, Graduation Approval>
+<Result Declaration, publishes, Counseling Session>
+<School Accreditation, connectedTo, Study Abroad Program>
+<School Accreditation, partOf, School Accreditation>
+<Special Education Support, accesses, Result Declaration>
+<Special Education Support, connectedTo, Timetable Scheduling>
+<Student Application, connectedTo, Advisory Committee Meeting>
+<Student Application, partOf, Student Application>
+<Student Enrollment, partOf, Student Enrollment>
+<Student Enrollment, plans, Result Declaration>
+<Study Abroad Program, connectedTo, Parent_Teacher Conference>
+<Study Abroad Program, partOf, Study Abroad Program>
+<Timetable Scheduling, connectedTo, Transcript Issuance>
+<Transcript Issuance, connectedTo, Lecture Delivery>
diff --git a/test/graphviz/scanned_hard/graphviz_247.dot b/test/graphviz/scanned_hard/graphviz_247.dot
new file mode 100644
index 0000000000000000000000000000000000000000..75c21e6761bda9e40b4363d2d9147422d9fdff71
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_247.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=LR
+	N0 [label="Wind Turbine Monitoring" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Renewable Integration" color="#73C6BC" fillcolor="#D0EFEE" shape=Mdiamond style=filled]
+	N2 [label="Transformer Station" color="#73C6BC" fillcolor="#D0EFEE" shape=Mdiamond style=filled]
+	N3 [label="Peak Shaving" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N4 [label="Energy Storage" color="#A2D0FF" fillcolor="#E8F0FF" shape=Mdiamond style=filled]
+	N5 [label="Circuit Breaker Operation" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+	N6 [label="Nuclear Reactor Control" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N7 [label="Geothermal Power" color="#5C6BC0" fillcolor="#E8EAF6" shape=oval style=filled]
+	N8 [label="Regulatory Compliance" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	S0 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Oil and Gas Exploration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Hydropower Generation" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+		nest0_1 [label="Grid Modernization" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+		nest0_2 [label="Voltage Regulation" color="#73C6BC" fillcolor="#D0EFEE" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Alert Dispatch" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Consumption Logging" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+		nest1_1 [label="Substation Automation" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+		nest1_2 [label="Generator Check" color="#73C6BC" fillcolor="#D0EFEE" shape=oval style=filled]
+		nest1_3 [label="Energy Trading" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [label=regulates color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	}
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+	S0 -> N6 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [label=upgrades color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [label=generates color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_247.txt b/test/graphviz/scanned_hard/graphviz_247.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6f697288a36ecdba26c5db6a0384b43a394c3b4d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_247.txt
@@ -0,0 +1,33 @@
+<Circuit Breaker Operation, connectedTo, Nuclear Reactor Control>
+<Consumption Logging, connectedTo, Substation Automation>
+<Consumption Logging, partOf, Consumption Logging>
+<Energy Storage, connectedTo, Circuit Breaker Operation>
+<Energy Storage, connectedTo, Geothermal Power>
+<Energy Storage, connectedTo, Hydropower Generation>
+<Energy Storage, connectedTo, Nuclear Reactor Control>
+<Energy Storage, connectedTo, Regulatory Compliance>
+<Energy Trading, connectedTo, Regulatory Compliance>
+<Energy Trading, partOf, Energy Trading>
+<Generator Check, partOf, Generator Check>
+<Generator Check, regulates, Energy Trading>
+<Geothermal Power, connectedTo, Regulatory Compliance>
+<Grid Modernization, connectedTo, Voltage Regulation>
+<Grid Modernization, partOf, Grid Modernization>
+<Hydropower Generation, connectedTo, Grid Modernization>
+<Hydropower Generation, partOf, Hydropower Generation>
+<Nuclear Reactor Control, purchases, Geothermal Power>
+<Peak Shaving, connectedTo, Geothermal Power>
+<Peak Shaving, connectedTo, Nuclear Reactor Control>
+<Peak Shaving, connectedTo, Regulatory Compliance>
+<Peak Shaving, controls, Energy Storage>
+<Renewable Integration, connectedTo, Transformer Station>
+<Renewable Integration, upgrades, Energy Storage>
+<Substation Automation, connectedTo, Generator Check>
+<Substation Automation, partOf, Substation Automation>
+<Transformer Station, connectedTo, Consumption Logging>
+<Transformer Station, connectedTo, Energy Storage>
+<Transformer Station, connectedTo, Peak Shaving>
+<Voltage Regulation, connectedTo, Nuclear Reactor Control>
+<Voltage Regulation, partOf, Voltage Regulation>
+<Wind Turbine Monitoring, connectedTo, Renewable Integration>
+<Wind Turbine Monitoring, generates, Energy Storage>
diff --git a/test/graphviz/scanned_hard/graphviz_248.txt b/test/graphviz/scanned_hard/graphviz_248.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bf095b85ed9e8b49918fe231ef1b18d04994e44b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_248.txt
@@ -0,0 +1,30 @@
+<Appeal Submission, connectedTo, Client Interview>
+<Appeal Submission, partOf, Appeal Submission>
+<Bail Hearing, connectedTo, Regulatory Compliance Review>
+<Bail Hearing, connectedTo, Sentencing>
+<Bail Hearing, connectedTo, Witness Testimony>
+<Case Filing, connectedTo, Plea Bargain>
+<Case Filing, partOf, Case Filing>
+<Client Interview, connectedTo, Sentencing>
+<Client Interview, partOf, Client Interview>
+<Contract Review, connectedTo, Witness Testimony>
+<Contract Review, partOf, Contract Review>
+<Divorce Proceedings, connectedTo, Contract Review>
+<Divorce Proceedings, partOf, Divorce Proceedings>
+<Document Drafting, connectedTo, Case Filing>
+<Document Drafting, connectedTo, Legal Consultation>
+<Document Drafting, connectedTo, Pro Bono Work>
+<Document Drafting, connectedTo, Regulatory Compliance Review>
+<Immigration Petition, connectedTo, Regulatory Compliance Review>
+<Immigration Petition, connectedTo, Sentencing>
+<Jury Selection, certifies, Divorce Proceedings>
+<Jury Selection, partOf, Jury Selection>
+<Plea Bargain, partOf, Plea Bargain>
+<Plea Bargain, represents, Appeal Submission>
+<Pro Bono Work, connectedTo, Regulatory Compliance Review>
+<Regulatory Compliance Review, connectedTo, Jury Selection>
+<Regulatory Compliance Review, connectedTo, Legal Consultation>
+<Sentencing, connectedTo, Document Drafting>
+<Witness Testimony, connectedTo, Immigration Petition>
+<Witness Testimony, connectedTo, Sentencing>
+<Witness Testimony, files, Sentencing>
diff --git a/test/graphviz/scanned_hard/graphviz_249.txt b/test/graphviz/scanned_hard/graphviz_249.txt
new file mode 100644
index 0000000000000000000000000000000000000000..dcf96743ff11d9d91a57968837446626588071ce
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_249.txt
@@ -0,0 +1,50 @@
+<Air Cargo Handling, connectedTo, Proof of Delivery>
+<Carrier Selection, connectedTo, Fleet Maintenance Scheduling>
+<Carrier Selection, partOf, Carrier Selection>
+<Cold Chain Management, connectedTo, Yard Management>
+<Cold Chain Management, partOf, Cold Chain Management>
+<Consolidation, connectedTo, Delay Notification>
+<Consolidation, connectedTo, Ocean Freight Management>
+<Consolidation, connectedTo, Proof of Delivery>
+<Consolidation, connectedTo, Route Optimization Software>
+<Consolidation, delivers, Route Assignment>
+<Consolidation, manages, Invoice Matching>
+<Consolidation, scans, Sorting Center>
+<Container Loading, analyzes, Ocean Freight Management>
+<Container Loading, connectedTo, Customs Clearance>
+<Cross_docking, connectedTo, Order Picking>
+<Cross_docking, partOf, Cross_docking>
+<Customs Clearance, connectedTo, Consolidation>
+<Damage Reporting, connectedTo, Order Picking>
+<Delay Notification, connectedTo, Carrier Selection>
+<Delay Notification, partOf, Delay Notification>
+<Delivery Confirmation, connectedTo, Damage Reporting>
+<Delivery Confirmation, connectedTo, Ocean Freight Management>
+<Delivery Confirmation, connectedTo, Route Optimization Software>
+<Delivery Confirmation, dispatches, Order Picking>
+<Fleet Maintenance Scheduling, connectedTo, Cross_docking>
+<Fleet Maintenance Scheduling, partOf, Fleet Maintenance Scheduling>
+<Freight Booking, connectedTo, Pickup Request>
+<Freight Booking, partOf, Freight Booking>
+<Invoice Matching, connectedTo, Ocean Freight Management>
+<Invoice Matching, connectedTo, Order Picking>
+<Invoice Matching, connectedTo, Sorting Center>
+<Invoice Matching, connectedTo, Warehouse Entry>
+<Invoice Matching, secures, Route Optimization Software>
+<Last_mile Dispatch, connectedTo, Sorting Center>
+<Ocean Freight Management, connectedTo, Barcode Scanning>
+<Order Picking, connectedTo, Ocean Freight Management>
+<Order Picking, connectedTo, Route Optimization Software>
+<Pickup Request, connectedTo, Damage Reporting>
+<Pickup Request, connectedTo, Last_mile Dispatch>
+<Proof of Delivery, connectedTo, Cold Chain Management>
+<Proof of Delivery, connectedTo, Last_mile Dispatch>
+<Proof of Delivery, connectedTo, Pickup Request>
+<Route Assignment, connectedTo, Invoice Matching>
+<Route Assignment, connectedTo, Last_mile Dispatch>
+<Route Optimization Software, connectedTo, Ocean Freight Management>
+<Sorting Center, connectedTo, Delivery Confirmation>
+<Warehouse Entry, connectedTo, Air Cargo Handling>
+<Warehouse Entry, connectedTo, Damage Reporting>
+<Yard Management, connectedTo, Freight Booking>
+<Yard Management, partOf, Yard Management>
diff --git a/test/graphviz/scanned_hard/graphviz_25.txt b/test/graphviz/scanned_hard/graphviz_25.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c022cd3f219b011d8eca2df4cac0a70b90804f86
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_25.txt
@@ -0,0 +1,12 @@
+<Assay Development, develops, Vaccine Development>
+<Bioimaging, publishes, Structural Biology>
+<Bioreactor Operation, designs, Protein Engineering>
+<Cell Culture, connectedTo, Bioimaging>
+<Data Management and Analysis, connectedTo, Intellectual Property Protection>
+<Data Management and Analysis, produces, Cell Culture>
+<Intellectual Property Protection, connectedTo, Bioreactor Operation>
+<Personalized Medicine Formulation, connectedTo, Assay Development>
+<Pharmacogenomics, harvests, Bioimaging>
+<Pharmacogenomics, simulates, Personalized Medicine Formulation>
+<Protein Engineering, grows, Data Management and Analysis>
+<Structural Biology, connectedTo, Pharmacogenomics>
diff --git a/test/graphviz/scanned_hard/graphviz_250.txt b/test/graphviz/scanned_hard/graphviz_250.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b5a9aa7f9d49dfb5541e1eba2bdc94f46d72e489
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_250.txt
@@ -0,0 +1,31 @@
+<Antenna Maintenance, connectedTo, Fiber Optic Deployment>
+<Base Station Installation, connectedTo, Plan Selection>
+<Bill Generation, connectedTo, Network Security Monitoring>
+<Bill Generation, partOf, Bill Generation>
+<Customer Support, ports, VoIP Service>
+<Fiber Optic Deployment, connectedTo, Technical Support Escalation>
+<Issue Resolution, connectedTo, Plan Renewal>
+<MMS Transmission, installs, Mobile Top_up>
+<Mobile Top_up, connectedTo, IoT Device Connection>
+<Network Activation, connectedTo, Antenna Maintenance>
+<Network Activation, connectedTo, MMS Transmission>
+<Network Activation, connectedTo, Mobile Top_up>
+<Network Activation, connectedTo, Network Upgrade>
+<Network Security Monitoring, connectedTo, Antenna Maintenance>
+<Network Security Monitoring, partOf, Network Security Monitoring>
+<Network Upgrade, connectedTo, Antenna Maintenance>
+<Network Upgrade, connectedTo, IoT Device Connection>
+<Network Upgrade, connectedTo, Issue Resolution>
+<Network Upgrade, connectedTo, Technical Support Escalation>
+<Payment Received, connectedTo, IoT Device Connection>
+<Payment Received, partOf, Payment Received>
+<Plan Renewal, connectedTo, MMS Transmission>
+<Plan Selection, connectedTo, Antenna Maintenance>
+<Plan Selection, connectedTo, Bill Generation>
+<Plan Selection, connectedTo, Network Activation>
+<Plan Selection, connectedTo, Troubleshooting Guide>
+<Technical Support Escalation, detects, Issue Resolution>
+<Troubleshooting Guide, connectedTo, Payment Received>
+<Troubleshooting Guide, partOf, Troubleshooting Guide>
+<VoIP Service, connectedTo, Antenna Maintenance>
+<VoIP Service, connectedTo, Base Station Installation>
diff --git a/test/graphviz/scanned_hard/graphviz_251.dot b/test/graphviz/scanned_hard/graphviz_251.dot
new file mode 100644
index 0000000000000000000000000000000000000000..67826b0dd89ad62974c1a048b42528d7e6b4b72d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_251.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=BT
+	N0 [label="Crop Monitoring" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N1 [label="Packaging for Sale" color="#FFE470" fillcolor="#FFFAE0" shape=oval style=filled]
+	N2 [label="Disease Detection" color="#FFE470" fillcolor="#FFFAE0" shape=parallelogram style=filled]
+	N3 [label="Aquaculture Farming" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N4 [label="Seed Sowing" color="#4DD0E1" fillcolor="#C9F0F0" shape=plaintext style=filled]
+	N5 [label="Greenhouse Control" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N6 [label="Barn Cleaning" color="#8C9EFF" fillcolor="#D3D7EB" shape=parallelogram style=filled]
+	N7 [label=Harvesting color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	S0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Supply Chain to Retailers" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Organic Certification" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest0_1 [label=Storage color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest0_2 [label="Grain Drying" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Crop Rotation Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Market Transportation" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+		nest1_1 [label="Livestock Feeding" color="#4DD0E1" fillcolor="#C9F0F0" shape=diamond style=filled]
+		nest1_2 [label="Precision Farming" color="#8C9EFF" fillcolor="#D3D7EB" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=irrigates color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [label=prunes color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N2 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N3 [label=stores color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N1 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N4 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=propagates color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N6 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_252.dot b/test/graphviz/scanned_hard/graphviz_252.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3ee941e38e8d3b98927da2da2faa5aff4683060a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_252.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=RL
+	N0 [label="Hotel Check_in" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Adventure Sports Booking" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N2 [label="Cultural Immersion Program" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N3 [label="Feedback Collection" color="#FFB74D" fillcolor="#FFF3E0" shape=oval style=filled]
+	N4 [label="Trip Sharing" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N5 [label="Currency Exchange" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N6 [label="Local Transport" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N7 [label="Duty_Free Shopping" color="#FFB74D" fillcolor="#FFF3E0" shape=octagon style=filled]
+	N8 [label="Destination Selection" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+	N9 [label="Activity Booking" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+	N10 [label="Spa Appointment" color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N11 [label="Visa Application" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+	N12 [label="Travel Blog Creation" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	S0 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Flight Booking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Airport Transfer" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_1 [label="Photo Capture" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Return Trip" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Event Reservation" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+		nest1_1 [label="Emergency Assistance" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=captures color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [label=responds color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N3 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N11 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [label=markets color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S2 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_252.txt b/test/graphviz/scanned_hard/graphviz_252.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d1e9d8b07c1fe5341a26ca6fad9b995614f2964a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_252.txt
@@ -0,0 +1,33 @@
+<Activity Booking, connectedTo, Spa Appointment>
+<Adventure Sports Booking, connectedTo, Cultural Immersion Program>
+<Adventure Sports Booking, connectedTo, Trip Sharing>
+<Adventure Sports Booking, responds, Airport Transfer>
+<Airport Transfer, connectedTo, Photo Capture>
+<Airport Transfer, partOf, Airport Transfer>
+<Cultural Immersion Program, connectedTo, Feedback Collection>
+<Cultural Immersion Program, connectedTo, Spa Appointment>
+<Cultural Immersion Program, connectedTo, Travel Blog Creation>
+<Cultural Immersion Program, connectedTo, Trip Sharing>
+<Cultural Immersion Program, connectedTo, Visa Application>
+<Currency Exchange, connectedTo, Local Transport>
+<Destination Selection, connectedTo, Activity Booking>
+<Duty_Free Shopping, connectedTo, Activity Booking>
+<Duty_Free Shopping, connectedTo, Destination Selection>
+<Duty_Free Shopping, connectedTo, Event Reservation>
+<Duty_Free Shopping, connectedTo, Travel Blog Creation>
+<Duty_Free Shopping, connectedTo, Visa Application>
+<Emergency Assistance, connectedTo, Visa Application>
+<Emergency Assistance, partOf, Emergency Assistance>
+<Event Reservation, connectedTo, Emergency Assistance>
+<Event Reservation, partOf, Event Reservation>
+<Feedback Collection, connectedTo, Trip Sharing>
+<Hotel Check_in, connectedTo, Adventure Sports Booking>
+<Hotel Check_in, connectedTo, Trip Sharing>
+<Local Transport, captures, Duty_Free Shopping>
+<Photo Capture, connectedTo, Feedback Collection>
+<Photo Capture, partOf, Photo Capture>
+<Spa Appointment, connectedTo, Visa Application>
+<Trip Sharing, connectedTo, Currency Exchange>
+<Trip Sharing, connectedTo, Destination Selection>
+<Trip Sharing, markets, Activity Booking>
+<Visa Application, connectedTo, Travel Blog Creation>
diff --git a/test/graphviz/scanned_hard/graphviz_254.txt b/test/graphviz/scanned_hard/graphviz_254.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c568840e6e071a3d7abd64298b2fbcd6ad973e29
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_254.txt
@@ -0,0 +1,36 @@
+<Community Outreach, connectedTo, Forensic Analysis>
+<Crime Prevention Programs, connectedTo, Surveillance Review>
+<Cybersecurity Threat Response, connectedTo, Suspect Identification>
+<Cybersecurity Threat Response, partOf, Cybersecurity Threat Response>
+<Disaster Relief Coordination, connectedTo, Crime Prevention Programs>
+<Disaster Relief Coordination, connectedTo, Drug Interdiction>
+<Disaster Relief Coordination, connectedTo, Suspect Identification>
+<Drug Interdiction, connectedTo, Cybersecurity Threat Response>
+<Drug Interdiction, partOf, Drug Interdiction>
+<Emergency Dispatch, connectedTo, Evidence Collection>
+<Emergency Dispatch, partOf, Emergency Dispatch>
+<Evidence Collection, connectedTo, Public Safety Training>
+<Evidence Collection, partOf, Evidence Collection>
+<First Aid Deployment, connectedTo, Hazard Detection>
+<First Aid Deployment, responds to, Surveillance Review>
+<Forensic Analysis, connectedTo, Public Warning>
+<Hazard Detection, connectedTo, Community Outreach>
+<Hazard Detection, connectedTo, Crime Prevention Programs>
+<Hazard Detection, connectedTo, Disaster Relief Coordination>
+<Hazard Detection, connectedTo, Forensic Analysis>
+<Hazard Detection, connectedTo, Victim Support Services>
+<Incident Command System Activation, connectedTo, First Aid Deployment>
+<Incident Command System Activation, partOf, Incident Command System Activation>
+<Law Enforcement Database Check, connectedTo, First Aid Deployment>
+<Law Enforcement Database Check, connectedTo, Surveillance Review>
+<Public Safety Training, connectedTo, Incident Command System Activation>
+<Public Safety Training, partOf, Public Safety Training>
+<Public Warning, connectedTo, Threat Assessment>
+<Shelter Setup, connectedTo, Emergency Dispatch>
+<Shelter Setup, monitors, Crime Prevention Programs>
+<Surveillance Review, connectedTo, Forensic Analysis>
+<Surveillance Review, connectedTo, Public Warning>
+<Surveillance Review, connectedTo, Victim Support Services>
+<Suspect Identification, connectedTo, Crime Prevention Programs>
+<Suspect Identification, connectedTo, Shelter Setup>
+<Victim Support Services, connectedTo, Community Outreach>
diff --git a/test/graphviz/scanned_hard/graphviz_255.dot b/test/graphviz/scanned_hard/graphviz_255.dot
new file mode 100644
index 0000000000000000000000000000000000000000..98d6a776808d2450af34900607059088534827c3
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_255.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=LR
+	N0 [label="Music Composition" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Location Scouting" color="#388E3C" fillcolor="#C8E6C9" shape=plaintext style=filled]
+	N2 [label="Editing Process" color="#388E3C" fillcolor="#C8E6C9" shape=folder style=filled]
+	N3 [label="Merchandise Creation" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N4 [label="Footage Review" color="#B8C0F5" fillcolor="#ECF0FD" shape=Mdiamond style=filled]
+	N5 [label="Trailer Production" color="#388E3C" fillcolor="#C8E6C9" shape=parallelogram style=filled]
+	N6 [label="Actor Rehearsal" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N7 [label="Licensing Approval" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N8 [label="Premiere Event" color="#B8C0F5" fillcolor="#ECF0FD" shape=folder style=filled]
+	N9 [label="Red Carpet Event" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N10 [label="Fan Engagement Strategy" color="#E91E63" fillcolor="#FCE4EC" shape=plaintext style=filled]
+	N11 [label="Scene Scheduling" color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+	N12 [label="Casting Call" color="#B8C0F5" fillcolor="#ECF0FD" shape=oval style=filled]
+	N13 [label="Talent Management" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Audience Feedback" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Live Performance" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+		nest0_1 [label="Film Festival Submission" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+		nest0_2 [label="Awards Ceremony Production" color="#E91E63" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Special Effects Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Marketing Campaign" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+		nest1_1 [label="Press Junket" color="#B8C0F5" fillcolor="#ECF0FD" shape=octagon style=filled]
+		nest1_2 [label="Broadcast Scheduling" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+		nest1_3 [label="Visual Effects" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N2 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest1_0 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N8 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_255.txt b/test/graphviz/scanned_hard/graphviz_255.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1ca83b846d584875002b29ef6cc84ae1e9183d3d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_255.txt
@@ -0,0 +1,37 @@
+<Actor Rehearsal, connectedTo, Licensing Approval>
+<Awards Ceremony Production, connectedTo, Editing Process>
+<Awards Ceremony Production, partOf, Awards Ceremony Production>
+<Broadcast Scheduling, connectedTo, Visual Effects>
+<Broadcast Scheduling, partOf, Broadcast Scheduling>
+<Casting Call, connectedTo, Talent Management>
+<Editing Process, connectedTo, Licensing Approval>
+<Editing Process, connectedTo, Merchandise Creation>
+<Editing Process, connectedTo, Scene Scheduling>
+<Editing Process, connectedTo, Trailer Production>
+<Fan Engagement Strategy, connectedTo, Casting Call>
+<Fan Engagement Strategy, connectedTo, Scene Scheduling>
+<Fan Engagement Strategy, connectedTo, Talent Management>
+<Film Festival Submission, connectedTo, Awards Ceremony Production>
+<Film Festival Submission, partOf, Film Festival Submission>
+<Footage Review, connectedTo, Trailer Production>
+<Licensing Approval, connectedTo, Premiere Event>
+<Live Performance, connectedTo, Film Festival Submission>
+<Live Performance, partOf, Live Performance>
+<Location Scouting, connectedTo, Editing Process>
+<Location Scouting, connectedTo, Licensing Approval>
+<Marketing Campaign, connectedTo, Press Junket>
+<Marketing Campaign, partOf, Marketing Campaign>
+<Merchandise Creation, connectedTo, Footage Review>
+<Merchandise Creation, connectedTo, Licensing Approval>
+<Music Composition, connectedTo, Location Scouting>
+<Premiere Event, connectedTo, Red Carpet Event>
+<Press Junket, connectedTo, Broadcast Scheduling>
+<Press Junket, partOf, Press Junket>
+<Red Carpet Event, connectedTo, Fan Engagement Strategy>
+<Scene Scheduling, connectedTo, Casting Call>
+<Scene Scheduling, connectedTo, Marketing Campaign>
+<Trailer Production, connectedTo, Actor Rehearsal>
+<Trailer Production, connectedTo, Licensing Approval>
+<Trailer Production, connectedTo, Live Performance>
+<Visual Effects, connectedTo, Premiere Event>
+<Visual Effects, partOf, Visual Effects>
diff --git a/test/graphviz/scanned_hard/graphviz_256.txt b/test/graphviz/scanned_hard/graphviz_256.txt
new file mode 100644
index 0000000000000000000000000000000000000000..beb27637d7dfb371f03ee3bd9f04fd2470f1f236
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_256.txt
@@ -0,0 +1,35 @@
+<Air Quality Monitoring, connectedTo, Environmental Education Programs>
+<Air Quality Monitoring, partOf, Air Quality Monitoring>
+<Carbon Footprint Calculation, connectedTo, Emission Reporting>
+<Carbon Footprint Calculation, partOf, Carbon Footprint Calculation>
+<Citizen Science Initiative, connectedTo, Coastal Erosion Control>
+<Citizen Science Initiative, connectedTo, Environmental Impact Assessment>
+<Climate Modeling, connectedTo, Coastal Erosion Control>
+<Climate Modeling, connectedTo, Stormwater Management>
+<Coastal Erosion Control, connectedTo, Sustainable Agriculture Practices>
+<Conservation Easement, connectedTo, Stormwater Management>
+<Conservation Easement, connectedTo, Waste Collection>
+<Ecological Footprint Analysis, connectedTo, Air Quality Monitoring>
+<Ecological Footprint Analysis, connectedTo, Coastal Erosion Control>
+<Emission Reporting, connectedTo, Citizen Science Initiative>
+<Energy Audit, connectedTo, Public Awareness Campaign>
+<Environmental Education Programs, connectedTo, Environmental Research>
+<Environmental Education Programs, partOf, Environmental Education Programs>
+<Environmental Impact Assessment, connectedTo, Ecological Footprint Analysis>
+<Environmental Impact Assessment, connectedTo, Renewable Energy Grid Integration>
+<Environmental Research, connectedTo, Public Awareness Campaign>
+<Environmental Research, partOf, Environmental Research>
+<Public Awareness Campaign, connectedTo, Groundwater Monitoring>
+<Renewable Energy Grid Integration, partOf, Renewable Energy Grid Integration>
+<Renewable Energy Grid Integration, recycles, Waste Water Treatment>
+<Resource Recovery, connectedTo, Energy Audit>
+<Resource Recovery, connectedTo, Groundwater Monitoring>
+<Resource Recovery, connectedTo, Public Awareness Campaign>
+<Stormwater Management, connectedTo, Emission Reporting>
+<Sustainable Agriculture Practices, adapts, Resource Recovery>
+<Sustainable Agriculture Practices, connectedTo, Energy Audit>
+<Sustainable Agriculture Practices, connectedTo, Public Awareness Campaign>
+<Waste Collection, connectedTo, Climate Modeling>
+<Waste Collection, connectedTo, Stormwater Management>
+<Waste Water Treatment, connectedTo, Carbon Footprint Calculation>
+<Waste Water Treatment, partOf, Waste Water Treatment>
diff --git a/test/graphviz/scanned_hard/graphviz_258.dot b/test/graphviz/scanned_hard/graphviz_258.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0cf66863ea957156b74b646a796dcf7515451436
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_258.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=TD
+	N0 [label="Gift Wrapping" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N1 [label="Sales Forecasting" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N2 [label="Customer Checkout" color="#BDAFA8" fillcolor="#E4E0DF" shape=oval style=filled]
+	N3 [label="Vendor Managed Inventory" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N4 [label="Store Layout Design" color="#BDAFA8" fillcolor="#E4E0DF" shape=diamond style=filled]
+	N5 [label="Customer Loyalty Analytics" color="#BDAFA8" fillcolor="#E4E0DF" shape=diamond style=filled]
+	N6 [label="Warehouse Picking" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N7 [label="Seasonal Sales Planning" color="#BDAFA8" fillcolor="#E4E0DF" shape=diamond style=filled]
+	N8 [label="E_commerce Platform Integration" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N9 [label="Complaint Management" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N10 [label="Customer Engagement" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N11 [label="Loss Prevention" color="#03A9F4" fillcolor="#B3E5FC" shape=octagon style=filled]
+	N12 [label="Price Tagging" color="#BDAFA8" fillcolor="#E4E0DF" shape=Mdiamond style=filled]
+	N13 [label="Stock Replenishment" color="#BDAFA8" fillcolor="#E4E0DF" shape=folder style=filled]
+	N14 [label="Security Tagging" color="#8C9EFF" fillcolor="#D3D7EB" shape=parallelogram style=filled]
+	N15 [label="Curbside Delivery" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N16 [label="Order Fulfillment" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	S0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Inventory Check" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Payment Processing" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+		nest0_1 [label="Product Demonstration" color="#BDAFA8" fillcolor="#E4E0DF" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Receipt Issuing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Supply Chain Optimization" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest1_1 [label="Product Listing" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=displays color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=purchases color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=trains color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=complies color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N15 -> nest0_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N1 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S0 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N12 -> S1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [label=discounts color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label=reports color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	M2 -> N5 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_258.txt b/test/graphviz/scanned_hard/graphviz_258.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4b49772d957eee7e788c64823a18ab04daaee1d4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_258.txt
@@ -0,0 +1,39 @@
+<Complaint Management, complies, Customer Engagement>
+<Complaint Management, connectedTo, Security Tagging>
+<Curbside Delivery, connectedTo, Order Fulfillment>
+<Curbside Delivery, connectedTo, Payment Processing>
+<Customer Checkout, connectedTo, Vendor Managed Inventory>
+<Customer Engagement, connectedTo, Loss Prevention>
+<Customer Engagement, connectedTo, Order Fulfillment>
+<Customer Engagement, connectedTo, Price Tagging>
+<Customer Loyalty Analytics, connectedTo, Supply Chain Optimization>
+<Customer Loyalty Analytics, connectedTo, Warehouse Picking>
+<E_commerce Platform Integration, trains, Complaint Management>
+<Gift Wrapping, connectedTo, Customer Loyalty Analytics>
+<Gift Wrapping, connectedTo, Store Layout Design>
+<Gift Wrapping, displays, Sales Forecasting>
+<Loss Prevention, connectedTo, Price Tagging>
+<Payment Processing, connectedTo, Product Demonstration>
+<Payment Processing, partOf, Payment Processing>
+<Price Tagging, connectedTo, Order Fulfillment>
+<Price Tagging, connectedTo, Security Tagging>
+<Price Tagging, connectedTo, Stock Replenishment>
+<Price Tagging, discounts, Curbside Delivery>
+<Product Demonstration, connectedTo, E_commerce Platform Integration>
+<Product Demonstration, partOf, Product Demonstration>
+<Product Listing, connectedTo, Sales Forecasting>
+<Product Listing, partOf, Product Listing>
+<Sales Forecasting, connectedTo, Customer Checkout>
+<Sales Forecasting, connectedTo, Customer Loyalty Analytics>
+<Sales Forecasting, connectedTo, Store Layout Design>
+<Sales Forecasting, reports, Security Tagging>
+<Seasonal Sales Planning, purchases, E_commerce Platform Integration>
+<Security Tagging, connectedTo, Curbside Delivery>
+<Stock Replenishment, connectedTo, Security Tagging>
+<Store Layout Design, connectedTo, Customer Loyalty Analytics>
+<Supply Chain Optimization, connectedTo, Product Listing>
+<Supply Chain Optimization, partOf, Supply Chain Optimization>
+<Vendor Managed Inventory, connectedTo, Customer Loyalty Analytics>
+<Vendor Managed Inventory, connectedTo, Security Tagging>
+<Vendor Managed Inventory, connectedTo, Store Layout Design>
+<Warehouse Picking, connectedTo, Seasonal Sales Planning>
diff --git a/test/graphviz/scanned_hard/graphviz_26.txt b/test/graphviz/scanned_hard/graphviz_26.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5d2d722e9a1b6b8fda1319ae808536b994d99c04
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_26.txt
@@ -0,0 +1,8 @@
+<Cleanroom Operations, connectedTo, Manufacturing Scale_up>
+<Clinical Trial Phases, innovates, Drug Repurposing>
+<Cold Chain Logistics, analyzes, Pharmacovigilance>
+<Drug Repurposing, connectedTo, Cold Chain Logistics>
+<Good Manufacturing Practices, advises, Cleanroom Operations>
+<Manufacturing Scale_up, stores, Solid Dosage Formulation>
+<Pharmacovigilance, connectedTo, Good Manufacturing Practices>
+<Solid Dosage Formulation, connectedTo, Good Manufacturing Practices>
diff --git a/test/graphviz/scanned_hard/graphviz_260.dot b/test/graphviz/scanned_hard/graphviz_260.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d632d6520c351318953d7917f6d7a757798f74d1
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_260.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=LR
+	N0 [label="Emergency Protocols" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N1 [label="Space Debris Tracking" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N2 [label="Structural Analysis" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N3 [label="Runway Inspection" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N4 [label="Aviation Safety Audit" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N5 [label="Re_entry Vehicle Design" color="#F7BEE0" fillcolor="#FAEBF3" shape=folder style=filled]
+	N6 [label="Aircraft Manufacturing" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N7 [label="System Reboot" color="#F7BEE0" fillcolor="#FAEBF3" shape=diamond style=filled]
+	N8 [label="Mission Planning" color="#CD8FF2" fillcolor="#ECCFF5" shape=oval style=filled]
+	N9 [label="International Space Station Resupply" color="#FBC02D" fillcolor="#FFFDE7" shape=oval style=filled]
+	N10 [label="Thermal Shield Testing" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N11 [label="Astronaut Training" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N12 [label="Drone System Development" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N13 [label="Rocket Assembly" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N14 [label="New Material Development" color="#FBC02D" fillcolor="#FFFDE7" shape=oval style=filled]
+	N15 [label="Ground Station Coordination" color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+	N16 [label="Satellite Configuration" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N17 [label="Countdown Sequence" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	S0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Engine Overhaul" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Aircraft Maintenance Log" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_1 [label="Hypersonic Flight Testing" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_2 [label="Avionics Installation" color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+		nest0_3 [label="Telemetry Setup" color="#FBC02D" fillcolor="#FFFDE7" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Spacecraft Telemetry Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Launch Execution" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest1_1 [label="Rocket Stage Separation" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=tests color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N15 -> nest0_0 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N16 [label=recovers color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N15 -> nest1_0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N15 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S0 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N17 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [label=monitors color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_261.dot b/test/graphviz/scanned_hard/graphviz_261.dot
new file mode 100644
index 0000000000000000000000000000000000000000..142f51fe6eab7a80ecb7ddf63b52d85615b15935
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_261.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=RL
+	N0 [label="Coverage Review" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N1 [label="Property Damage Assessment" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N2 [label="Broker Management" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N3 [label="Product Development" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N4 [label="Cyber Insurance Policy" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N5 [label="Fraud Investigation" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N6 [label="Third_Party Administrator Liaison" color="#66BB6A" fillcolor="#E8F5E9" shape=oval style=filled]
+	N7 [label="Investment Management for Reserves" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N8 [label="Customer Onboarding" color="#E0E0E0" fillcolor="#EBEBEB" shape=oval style=filled]
+	N9 [label=Subrogation color="#E0E0E0" fillcolor="#EBEBEB" shape=oval style=filled]
+	N10 [label="Payment Processing" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	S0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Auto Accident Claims" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Claim Submission" color="#66BB6A" fillcolor="#E8F5E9" shape=oval style=filled]
+		nest0_1 [label="Claim Adjustment" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+		nest0_2 [label="Actuarial Analysis" color="#66BB6A" fillcolor="#E8F5E9" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Customer Communication" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Loss Prevention" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+		nest1_1 [label="Data Security" color="#E0E0E0" fillcolor="#EBEBEB" shape=folder style=filled]
+		nest1_2 [label="Life Insurance Underwriting" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [label=reviews color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N7 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N8 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_262.dot b/test/graphviz/scanned_hard/graphviz_262.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5cc58d9948fa5af2582c003d39fa8b51c658c079
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_262.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=BT
+	N0 [label="Cloud Security" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N1 [label="DevSecOps Integration" color="#FFEB3B" fillcolor="#FFF9C4" shape=octagon style=filled]
+	N2 [label="Backup and Recovery" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N3 [label="Security Policy Development" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N4 [label="Insider Threat Detection" color="#26A69A" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N5 [label="Incident Response" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N6 [label="Threat Intelligence Gathering" color="#26A69A" fillcolor="#E0F2F1" shape=octagon style=filled]
+	N7 [label="Application Security" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N8 [label="Dark Web Monitoring" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N9 [label="Cryptography Implementation" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N10 [label="IoT Security" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N11 [label="Digital Forensics" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N12 [label="Risk Management Framework" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N13 [label="Penetration Testing" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N14 [label="Phishing Simulation" color="#388E3C" fillcolor="#F1F8E9" shape=folder style=filled]
+	N15 [label="Mobile Security" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N16 [label="Intrusion Prevention" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N17 [label="User Training" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N18 [label="Endpoint Protection" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Threat Detection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Security Awareness Training" color="#388E3C" fillcolor="#F1F8E9" shape=plaintext style=filled]
+		nest0_1 [label="Antivirus Management" color="#388E3C" fillcolor="#F1F8E9" shape=oval style=filled]
+		nest0_2 [label="Malware Analysis" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest0_3 [label="Data Loss Prevention" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Security Information and Event Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Zero Trust Architecture" color="#388E3C" fillcolor="#F1F8E9" shape=oval style=filled]
+		nest1_1 [label="Vulnerability Assessment" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=authenticates color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N18 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N15 -> nest1_0 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N2 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [label=configures color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S2 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S2 -> N16 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S2 -> N15 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_262.txt b/test/graphviz/scanned_hard/graphviz_262.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a3e70a433fba928c31dcac800f5ea4c8b4115052
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_262.txt
@@ -0,0 +1,43 @@
+<Antivirus Management, connectedTo, Malware Analysis>
+<Antivirus Management, partOf, Antivirus Management>
+<Application Security, connectedTo, Dark Web Monitoring>
+<Backup and Recovery, configures, Risk Management Framework>
+<Backup and Recovery, connectedTo, Incident Response>
+<Backup and Recovery, connectedTo, Insider Threat Detection>
+<Backup and Recovery, connectedTo, Security Policy Development>
+<Backup and Recovery, connectedTo, User Training>
+<Cloud Security, connectedTo, DevSecOps Integration>
+<Cloud Security, connectedTo, Incident Response>
+<Cloud Security, connectedTo, Insider Threat Detection>
+<Cryptography Implementation, connectedTo, IoT Security>
+<Dark Web Monitoring, connectedTo, Cryptography Implementation>
+<Dark Web Monitoring, connectedTo, Security Awareness Training>
+<Data Loss Prevention, connectedTo, Endpoint Protection>
+<Data Loss Prevention, partOf, Data Loss Prevention>
+<DevSecOps Integration, authenticates, Backup and Recovery>
+<DevSecOps Integration, connectedTo, Insider Threat Detection>
+<Digital Forensics, connectedTo, Risk Management Framework>
+<Incident Response, connectedTo, Threat Intelligence Gathering>
+<Insider Threat Detection, connectedTo, Incident Response>
+<Intrusion Prevention, connectedTo, User Training>
+<IoT Security, connectedTo, Digital Forensics>
+<Malware Analysis, connectedTo, Data Loss Prevention>
+<Malware Analysis, partOf, Malware Analysis>
+<Mobile Security, connectedTo, Intrusion Prevention>
+<Mobile Security, connectedTo, Zero Trust Architecture>
+<Penetration Testing, connectedTo, Phishing Simulation>
+<Phishing Simulation, connectedTo, Mobile Security>
+<Risk Management Framework, connectedTo, Intrusion Prevention>
+<Risk Management Framework, connectedTo, Mobile Security>
+<Risk Management Framework, connectedTo, Penetration Testing>
+<Risk Management Framework, connectedTo, Phishing Simulation>
+<Security Awareness Training, connectedTo, Antivirus Management>
+<Security Awareness Training, partOf, Security Awareness Training>
+<Security Policy Development, connectedTo, Incident Response>
+<Security Policy Development, connectedTo, Insider Threat Detection>
+<Threat Intelligence Gathering, connectedTo, Application Security>
+<User Training, connectedTo, Endpoint Protection>
+<Vulnerability Assessment, connectedTo, Backup and Recovery>
+<Vulnerability Assessment, partOf, Vulnerability Assessment>
+<Zero Trust Architecture, connectedTo, Vulnerability Assessment>
+<Zero Trust Architecture, partOf, Zero Trust Architecture>
diff --git a/test/graphviz/scanned_hard/graphviz_263.txt b/test/graphviz/scanned_hard/graphviz_263.txt
new file mode 100644
index 0000000000000000000000000000000000000000..daeadc3e44075113b126ff8f9434c4e43fe7d3bf
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_263.txt
@@ -0,0 +1,40 @@
+<App Control, connectedTo, Remote Control>
+<App Control, partOf, App Control>
+<Child Monitoring, connectedTo, Personalized Comfort Settings>
+<Curtain Automation, connectedTo, Smart Mirror Functionality>
+<Curtain Automation, partOf, Curtain Automation>
+<Device Pairing, connectedTo, Smart Mirror Functionality>
+<Door Lock Management, connectedTo, Geofencing Trigger>
+<Door Lock Management, connectedTo, Lighting Automation>
+<Door Lock Management, connectedTo, Smart Mirror Functionality>
+<Door Lock Management, diagnoses, Child Monitoring>
+<Doorbell Camera Alert, connectedTo, Door Lock Management>
+<Doorbell Camera Alert, connectedTo, Geofencing Trigger>
+<Doorbell Camera Alert, connectedTo, Power Outage Notification>
+<Emergency Service Connection, connectedTo, Child Monitoring>
+<Emergency Service Connection, connectedTo, Doorbell Camera Alert>
+<Emergency Service Connection, connectedTo, Geofencing Trigger>
+<Emergency Service Connection, connectedTo, Smart Mirror Functionality>
+<Energy Consumption Optimization, connectedTo, Air Quality Monitoring>
+<Garage Door Control, connectedTo, Lighting Automation>
+<Garage Door Control, partOf, Garage Door Control>
+<Geofencing Trigger, connectedTo, App Control>
+<Geofencing Trigger, connectedTo, Security Alert>
+<Guest Access Management, connectedTo, Leak Detection>
+<Leak Detection, connectedTo, Child Monitoring>
+<Leak Detection, connectedTo, Emergency Service Connection>
+<Lighting Automation, connectedTo, Device Pairing>
+<Personalized Comfort Settings, connectedTo, Geofencing Trigger>
+<Pet Feeder Automation, connectedTo, Curtain Automation>
+<Pet Feeder Automation, partOf, Pet Feeder Automation>
+<Power Outage Notification, partOf, Power Outage Notification>
+<Power Outage Notification, streams, Garage Door Control>
+<Remote Control, connectedTo, Pet Feeder Automation>
+<Remote Control, partOf, Remote Control>
+<Routine Scheduling, connectedTo, Window Sensor Monitoring>
+<Security Alert, connectedTo, Air Quality Monitoring>
+<Security Alert, connectedTo, Device Pairing>
+<Security Alert, connectedTo, Routine Scheduling>
+<Security Alert, connectedTo, Window Sensor Monitoring>
+<Smart Mirror Functionality, connectedTo, Energy Consumption Optimization>
+<Window Sensor Monitoring, connectedTo, Lighting Automation>
diff --git a/test/graphviz/scanned_hard/graphviz_264.dot b/test/graphviz/scanned_hard/graphviz_264.dot
new file mode 100644
index 0000000000000000000000000000000000000000..27537cca04eb8ffd623199e9c0970b36efd865b4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_264.dot
@@ -0,0 +1,90 @@
+digraph {
+	rankdir=BT
+	N0 [label="Disaster Resilience Planning" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N1 [label="Public Safety Monitoring" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N2 [label="Digital Twins of City" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N3 [label="Environmental Sensor Network" color="#90A4AE" fillcolor="#ECEFF1" shape=plaintext style=filled]
+	N4 [label="Smart Grid Security" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N5 [label="Data Privacy Protection" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N6 [label="Public Transport Tracking" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N7 [label="Waste Management Optimization" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N8 [label="Waste Recycling Program" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N9 [label="Emergency Response System" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N10 [label="Smart Lighting" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N11 [label="Energy Grid Management" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N12 [label="City_wide Sensor Network Deployment" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N13 [label="Smart Parking" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N14 [label="Predictive Maintenance for Utilities" color="#FFE470" fillcolor="#FFFAE0" shape=Mdiamond style=filled]
+	N15 [label="Public Health Monitoring" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N16 [label="Renewable Energy Integration" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	S0 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Smart Education Initiatives" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Citizen Feedback Loop" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+		nest0_1 [label="Water Management System" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+		nest0_2 [label="Cybersecurity for Infrastructure" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Infrastructure Maintenance Alert" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Traffic Flow Optimization" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest1_1 [label="Smart Water Meters" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest1_2 [label="Sustainable Resource Management" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest1_3 [label="Intelligent Public Safety Cameras" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
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+	N6 -> N7 [label=responds color="#FFE470" dir=forward penwidth=1.5 style=solid]
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+	N10 -> N11 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
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+	N14 -> N15 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N16 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N4 [label=maintains color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N8 -> S2 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	M1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N5 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_264.txt b/test/graphviz/scanned_hard/graphviz_264.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6e2985d647814d5fe0d1ddb3aeb60ea3884c37b3
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_264.txt
@@ -0,0 +1,48 @@
+<Citizen Feedback Loop, connectedTo, Water Management System>
+<Citizen Feedback Loop, partOf, Citizen Feedback Loop>
+<City_wide Sensor Network Deployment, connectedTo, Smart Parking>
+<Cybersecurity for Infrastructure, connectedTo, Renewable Energy Integration>
+<Cybersecurity for Infrastructure, partOf, Cybersecurity for Infrastructure>
+<Data Privacy Protection, connectedTo, Predictive Maintenance for Utilities>
+<Data Privacy Protection, connectedTo, Public Transport Tracking>
+<Data Privacy Protection, connectedTo, Traffic Flow Optimization>
+<Digital Twins of City, connectedTo, Data Privacy Protection>
+<Digital Twins of City, connectedTo, Environmental Sensor Network>
+<Disaster Resilience Planning, connectedTo, Data Privacy Protection>
+<Disaster Resilience Planning, connectedTo, Public Safety Monitoring>
+<Emergency Response System, connectedTo, Smart Lighting>
+<Energy Grid Management, connectedTo, City_wide Sensor Network Deployment>
+<Energy Grid Management, connectedTo, Predictive Maintenance for Utilities>
+<Energy Grid Management, connectedTo, Public Health Monitoring>
+<Energy Grid Management, connectedTo, Renewable Energy Integration>
+<Energy Grid Management, connectedTo, Smart Parking>
+<Environmental Sensor Network, connectedTo, Citizen Feedback Loop>
+<Environmental Sensor Network, connectedTo, Data Privacy Protection>
+<Environmental Sensor Network, connectedTo, Smart Grid Security>
+<Intelligent Public Safety Cameras, maintains, Smart Grid Security>
+<Intelligent Public Safety Cameras, partOf, Intelligent Public Safety Cameras>
+<Predictive Maintenance for Utilities, connectedTo, Public Health Monitoring>
+<Public Health Monitoring, connectedTo, Renewable Energy Integration>
+<Public Safety Monitoring, connectedTo, Data Privacy Protection>
+<Public Safety Monitoring, connectedTo, Digital Twins of City>
+<Public Safety Monitoring, connectedTo, Predictive Maintenance for Utilities>
+<Public Transport Tracking, responds, Waste Management Optimization>
+<Smart Grid Security, connectedTo, Data Privacy Protection>
+<Smart Lighting, connectedTo, Energy Grid Management>
+<Smart Lighting, connectedTo, Predictive Maintenance for Utilities>
+<Smart Parking, connectedTo, Predictive Maintenance for Utilities>
+<Smart Water Meters, connectedTo, Sustainable Resource Management>
+<Smart Water Meters, partOf, Smart Water Meters>
+<Sustainable Resource Management, connectedTo, Intelligent Public Safety Cameras>
+<Sustainable Resource Management, partOf, Sustainable Resource Management>
+<Traffic Flow Optimization, connectedTo, Smart Water Meters>
+<Traffic Flow Optimization, partOf, Traffic Flow Optimization>
+<Waste Management Optimization, connectedTo, Waste Recycling Program>
+<Waste Recycling Program, connectedTo, City_wide Sensor Network Deployment>
+<Waste Recycling Program, connectedTo, Emergency Response System>
+<Waste Recycling Program, connectedTo, Energy Grid Management>
+<Waste Recycling Program, connectedTo, Predictive Maintenance for Utilities>
+<Waste Recycling Program, connectedTo, Public Health Monitoring>
+<Waste Recycling Program, connectedTo, Renewable Energy Integration>
+<Water Management System, connectedTo, Cybersecurity for Infrastructure>
+<Water Management System, partOf, Water Management System>
diff --git a/test/graphviz/scanned_hard/graphviz_265.txt b/test/graphviz/scanned_hard/graphviz_265.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fef80fde0c29f184e7c2a16ba4bbf26b4ec63f99
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_265.txt
@@ -0,0 +1,32 @@
+<Biomanufacturing Scale_up, connectedTo, Protein Engineering>
+<Biomanufacturing Scale_up, connectedTo, Structural Biology>
+<Biomanufacturing Scale_up, synthesizes, Clinical Data Interpretation>
+<Biomarker Discovery, connectedTo, Protein Engineering>
+<Biomarker Discovery, grows, Synthetic Biology Design>
+<Biomarker Discovery, partOf, Biomarker Discovery>
+<Cell Culture, connectedTo, Stem Cell Research>
+<Cell Culture, connectedTo, Synthetic Biology Design>
+<Cell Culture, simulates, Structural Biology>
+<Clinical Data Interpretation, connectedTo, Monoclonal Antibody Production>
+<Clinical Trial Design, connectedTo, Biomarker Discovery>
+<Clinical Trial Design, connectedTo, Drug Repurposing>
+<Computational Biology Modeling, connectedTo, Monoclonal Antibody Production>
+<Computational Biology Modeling, partOf, Computational Biology Modeling>
+<Drug Repurposing, connectedTo, Cell Culture>
+<Drug Repurposing, connectedTo, Intellectual Property Protection>
+<Drug Repurposing, connectedTo, Microbial Fermentation>
+<Intellectual Property Protection, connectedTo, Biomanufacturing Scale_up>
+<Microbial Fermentation, connectedTo, Personalized Medicine Formulation>
+<Microbial Fermentation, partOf, Microbial Fermentation>
+<Monoclonal Antibody Production, connectedTo, Cell Culture>
+<Nanobiotechnology Application, connectedTo, Intellectual Property Protection>
+<Nanobiotechnology Application, connectedTo, Stem Cell Research>
+<Personalized Medicine Formulation, connectedTo, Computational Biology Modeling>
+<Personalized Medicine Formulation, partOf, Personalized Medicine Formulation>
+<Protein Engineering, connectedTo, Biomarker Discovery>
+<Protein Engineering, connectedTo, Monoclonal Antibody Production>
+<Protein Engineering, connectedTo, Nanobiotechnology Application>
+<Protein Engineering, partOf, Protein Engineering>
+<Structural Biology, connectedTo, Nanobiotechnology Application>
+<Synthetic Biology Design, connectedTo, Vaccine Development>
+<Vaccine Development, connectedTo, Structural Biology>
diff --git a/test/graphviz/scanned_hard/graphviz_266.txt b/test/graphviz/scanned_hard/graphviz_266.txt
new file mode 100644
index 0000000000000000000000000000000000000000..35333df1256e2aa7eb94a034ff69d3ed67533488
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_266.txt
@@ -0,0 +1,45 @@
+<Adverse Event Reporting, connectedTo, Intellectual Property Litigation>
+<Audit Management, monitors, Quality Control>
+<Batch Release, connectedTo, Global Regulatory Affairs>
+<Batch Release, connectedTo, Patient Adherence Programs>
+<Clinical Supply Management, connectedTo, Patient Adherence Programs>
+<Clinical Supply Management, partOf, Clinical Supply Management>
+<Drug Repurposing, connectedTo, Clinical Supply Management>
+<Drug Repurposing, partOf, Drug Repurposing>
+<Global Regulatory Affairs, connectedTo, Audit Management>
+<Injectable Drug Manufacturing, connectedTo, Audit Management>
+<Injectable Drug Manufacturing, connectedTo, Drug Repurposing>
+<Injectable Drug Manufacturing, connectedTo, Global Regulatory Affairs>
+<Injectable Drug Manufacturing, connectedTo, Intellectual Property Litigation>
+<Injectable Drug Manufacturing, connectedTo, Post_Approval Commitment Tracking>
+<Injectable Drug Manufacturing, discovers, Pharmacovigilance>
+<Intellectual Property Litigation, connectedTo, Pharmacovigilance>
+<Intellectual Property Litigation, connectedTo, Post_Marketing Surveillance>
+<Packaging, connectedTo, Supply Chain Management>
+<Packaging, partOf, Packaging>
+<Patent Application, connectedTo, Audit Management>
+<Patent Application, connectedTo, Solid Dosage Formulation>
+<Patient Adherence Programs, analyzes, Audit Management>
+<Patient Adherence Programs, connectedTo, Adverse Event Reporting>
+<Patient Adherence Programs, connectedTo, Global Regulatory Affairs>
+<Pharmacovigilance, connectedTo, Regulatory Approval>
+<Post_Approval Commitment Tracking, connectedTo, Audit Management>
+<Post_Approval Commitment Tracking, connectedTo, Batch Release>
+<Post_Approval Commitment Tracking, connectedTo, Global Regulatory Affairs>
+<Post_Approval Commitment Tracking, connectedTo, Intellectual Property Litigation>
+<Post_Approval Commitment Tracking, connectedTo, Quality Control>
+<Post_Approval Commitment Tracking, connectedTo, Regulatory Approval>
+<Post_Approval Commitment Tracking, consults, Patient Adherence Programs>
+<Post_Marketing Surveillance, connectedTo, Packaging>
+<Post_Marketing Surveillance, partOf, Post_Marketing Surveillance>
+<Preclinical Testing, connectedTo, Adverse Event Reporting>
+<Quality Control, connectedTo, Sales and Marketing Strategy>
+<Sales and Marketing Strategy, connectedTo, Preclinical Testing>
+<Solid Dosage Formulation, connectedTo, Adverse Event Reporting>
+<Solid Dosage Formulation, connectedTo, Audit Management>
+<Solid Dosage Formulation, connectedTo, Global Regulatory Affairs>
+<Solid Dosage Formulation, connectedTo, Injectable Drug Manufacturing>
+<Solid Dosage Formulation, connectedTo, Patient Adherence Programs>
+<Solid Dosage Formulation, connectedTo, Pharmacovigilance>
+<Supply Chain Management, connectedTo, Pharmacovigilance>
+<Supply Chain Management, partOf, Supply Chain Management>
diff --git a/test/graphviz/scanned_hard/graphviz_269.dot b/test/graphviz/scanned_hard/graphviz_269.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fcaa4652d84837a8ada7865270c506edd90322dc
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_269.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=LR
+	N0 [label="Augmented Reality Experiences" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N1 [label=Journalism color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N2 [label="Data Monetization" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N3 [label="Cross_Platform Syndication" color="#DCE775" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+	N4 [label="Live Streaming" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N5 [label="Social Media Management" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N6 [label="Podcast Production" color="#DCE775" fillcolor="#F9FBE7" shape=octagon style=filled]
+	N7 [label="Audience Engagement" color="#61CAC3" fillcolor="#C2E8E6" shape=oval style=filled]
+	N8 [label="Game Streaming" color="#DCE775" fillcolor="#F9FBE7" shape=folder style=filled]
+	N9 [label=Photojournalism color="#DCE775" fillcolor="#F9FBE7" shape=octagon style=filled]
+	N10 [label="Visual Effects" color="#FFCC7A" fillcolor="#FFF6D9" shape=folder style=filled]
+	N11 [label="Copyright Management" color="#61CAC3" fillcolor="#C2E8E6" shape=Mdiamond style=filled]
+	N12 [label="Radio Programming" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N13 [label=Broadcasting color="#61CAC3" fillcolor="#C2E8E6" shape=folder style=filled]
+	N14 [label=Editing color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N15 [label="Subscription Management" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Analytics Reporting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
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+		nest0_1 [label="Crisis Communication" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_2 [label="Platform Development" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_3 [label="Media Consumption Trends Analysis" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
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+		nest0_2 -> nest0_3 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Public Relations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Audience Segmentation" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+		nest1_1 [label="Film Production" color="#DCE775" fillcolor="#F9FBE7" shape=folder style=filled]
+		nest1_0 -> nest1_1 [label=interviews color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=regulates color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=secures color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N2 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N0 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N2 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [label=audits color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [label=sponsors color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_269.txt b/test/graphviz/scanned_hard/graphviz_269.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e0d15034618eff255094df80543f9076bcc68b66
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_269.txt
@@ -0,0 +1,41 @@
+<Audience Engagement, connectedTo, Game Streaming>
+<Audience Segmentation, interviews, Film Production>
+<Audience Segmentation, partOf, Audience Segmentation>
+<Augmented Reality Experiences, connectedTo, Copyright Management>
+<Augmented Reality Experiences, connectedTo, Data Monetization>
+<Augmented Reality Experiences, connectedTo, Journalism>
+<Augmented Reality Experiences, connectedTo, Photojournalism>
+<Augmented Reality Experiences, connectedTo, Radio Programming>
+<Broadcasting, connectedTo, Editing>
+<Copyright Management, connectedTo, Radio Programming>
+<Crisis Communication, connectedTo, Platform Development>
+<Crisis Communication, partOf, Crisis Communication>
+<Cross_Platform Syndication, connectedTo, Audience Engagement>
+<Cross_Platform Syndication, connectedTo, Live Streaming>
+<Data Monetization, connectedTo, Cross_Platform Syndication>
+<Data Monetization, connectedTo, Virtual Reality Content Creation>
+<Data Monetization, sponsors, Photojournalism>
+<Editing, connectedTo, Subscription Management>
+<Film Production, connectedTo, Data Monetization>
+<Film Production, partOf, Film Production>
+<Game Streaming, connectedTo, Photojournalism>
+<Journalism, connectedTo, Data Monetization>
+<Live Streaming, regulates, Social Media Management>
+<Media Consumption Trends Analysis, connectedTo, Journalism>
+<Media Consumption Trends Analysis, partOf, Media Consumption Trends Analysis>
+<Photojournalism, secures, Visual Effects>
+<Platform Development, connectedTo, Media Consumption Trends Analysis>
+<Platform Development, partOf, Platform Development>
+<Podcast Production, audits, Photojournalism>
+<Podcast Production, connectedTo, Audience Engagement>
+<Podcast Production, connectedTo, Broadcasting>
+<Podcast Production, connectedTo, Photojournalism>
+<Podcast Production, connectedTo, Subscription Management>
+<Podcast Production, connectedTo, Visual Effects>
+<Radio Programming, connectedTo, Broadcasting>
+<Social Media Management, connectedTo, Audience Engagement>
+<Social Media Management, connectedTo, Podcast Production>
+<Virtual Reality Content Creation, connectedTo, Crisis Communication>
+<Virtual Reality Content Creation, partOf, Virtual Reality Content Creation>
+<Visual Effects, connectedTo, Audience Segmentation>
+<Visual Effects, connectedTo, Copyright Management>
diff --git a/test/graphviz/scanned_hard/graphviz_27.txt b/test/graphviz/scanned_hard/graphviz_27.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9d1288cc31792022398be33927add3da12799b10
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_27.txt
@@ -0,0 +1,12 @@
+<Autonomous Navigation, connectedTo, Drone Control>
+<Battery Management, manipulates, Grasping and Manipulation>
+<Drone Control, connectedTo, Industrial Automation>
+<Force Control, connectedTo, Battery Management>
+<Force Control, connectedTo, Grasping and Manipulation>
+<Grasping and Manipulation, connectedTo, Maintenance>
+<Maintenance, connectedTo, Robotics Simulation>
+<Robot Assembly, assembles, Autonomous Navigation>
+<Robot Design, moves, Force Control>
+<Robotics Simulation, connectedTo, Grasping and Manipulation>
+<Robotics Simulation, lifts, Robot Assembly>
+<Wireless Communication, assists, Robot Design>
diff --git a/test/graphviz/scanned_hard/graphviz_270.dot b/test/graphviz/scanned_hard/graphviz_270.dot
new file mode 100644
index 0000000000000000000000000000000000000000..368dfd6d9ddefd2403be9866d0519ec93fda70f0
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_270.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=RL
+	N0 [label="Quality Control" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N1 [label="Nutrition Analysis" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N2 [label="Product Shelf_Life Testing" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+	N3 [label="Food Preservation" color="#94C0C0" fillcolor="#CADEDE" shape=Mdiamond style=filled]
+	N4 [label="Beverage Production" color="#FFF8A6" fillcolor="#FFFDE0" shape=Mdiamond style=filled]
+	N5 [label="Ingredient Traceability" color="#4285F4" fillcolor="#D0E0F8" shape=Mdiamond style=filled]
+	N6 [label="Sustainable Sourcing" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N7 [label="Supplier Management" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N8 [label="Service Delivery" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N9 [label="Storage Solutions" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N10 [label="Sensory Evaluation" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	S0 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Kitchen Hygiene" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Recipe Development" color="#94C0C0" fillcolor="#CADEDE" shape=octagon style=filled]
+		nest0_1 [label=Packaging color="#94C0C0" fillcolor="#CADEDE" shape=parallelogram style=filled]
+		nest0_2 [label="Regulatory Compliance" color="#4285F4" fillcolor="#D0E0F8" shape=folder style=filled]
+		nest0_3 [label="Food Packaging Design" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Waste Reduction" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Consumer Feedback Collection" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest1_1 [label="Food Waste Management System" color="#94C0C0" fillcolor="#CADEDE" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [label=cleans color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N8 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest1_0 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N8 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [label=certifies color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N2 -> S2 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_270.txt b/test/graphviz/scanned_hard/graphviz_270.txt
new file mode 100644
index 0000000000000000000000000000000000000000..65bda30694d274309d0e902bd9c0403d5288d0ec
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_270.txt
@@ -0,0 +1,34 @@
+<Beverage Production, connectedTo, Ingredient Traceability>
+<Consumer Feedback Collection, connectedTo, Food Waste Management System>
+<Consumer Feedback Collection, partOf, Consumer Feedback Collection>
+<Food Packaging Design, connectedTo, Service Delivery>
+<Food Packaging Design, partOf, Food Packaging Design>
+<Food Preservation, connectedTo, Beverage Production>
+<Food Preservation, connectedTo, Storage Solutions>
+<Food Preservation, connectedTo, Supplier Management>
+<Food Waste Management System, connectedTo, Service Delivery>
+<Food Waste Management System, partOf, Food Waste Management System>
+<Ingredient Traceability, connectedTo, Supplier Management>
+<Ingredient Traceability, connectedTo, Sustainable Sourcing>
+<Nutrition Analysis, connectedTo, Product Shelf_Life Testing>
+<Packaging, connectedTo, Regulatory Compliance>
+<Packaging, partOf, Packaging>
+<Product Shelf_Life Testing, connectedTo, Food Preservation>
+<Product Shelf_Life Testing, connectedTo, Ingredient Traceability>
+<Product Shelf_Life Testing, connectedTo, Storage Solutions>
+<Product Shelf_Life Testing, connectedTo, Supplier Management>
+<Product Shelf_Life Testing, connectedTo, Sustainable Sourcing>
+<Quality Control, connectedTo, Nutrition Analysis>
+<Recipe Development, connectedTo, Packaging>
+<Recipe Development, partOf, Recipe Development>
+<Regulatory Compliance, connectedTo, Food Packaging Design>
+<Regulatory Compliance, partOf, Regulatory Compliance>
+<Service Delivery, cleans, Recipe Development>
+<Service Delivery, connectedTo, Storage Solutions>
+<Storage Solutions, connectedTo, Consumer Feedback Collection>
+<Storage Solutions, connectedTo, Sensory Evaluation>
+<Supplier Management, connectedTo, Service Delivery>
+<Sustainable Sourcing, certifies, Storage Solutions>
+<Sustainable Sourcing, connectedTo, Sensory Evaluation>
+<Sustainable Sourcing, connectedTo, Service Delivery>
+<Sustainable Sourcing, connectedTo, Supplier Management>
diff --git a/test/graphviz/scanned_hard/graphviz_272.txt b/test/graphviz/scanned_hard/graphviz_272.txt
new file mode 100644
index 0000000000000000000000000000000000000000..067d125e132b23b6514a564570032626d653df8c
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_272.txt
@@ -0,0 +1,37 @@
+<Brand Licensing, connectedTo, Distribution>
+<Color Palette Selection, connectedTo, Fashion Show Production>
+<Color Palette Selection, partOf, Color Palette Selection>
+<Custom Apparel Design, connectedTo, Brand Licensing>
+<Custom Apparel Design, connectedTo, Retail Store Merchandising>
+<Custom Apparel Design, connectedTo, Seasonal Collection Planning>
+<Design Sketching, connectedTo, PR and Media Outreach>
+<Distribution, connectedTo, Sample Creation>
+<E_commerce Management, connectedTo, Seasonal Collection Planning>
+<E_commerce Management, partOf, E_commerce Management>
+<Embroidery and Embellishment, connectedTo, Design Sketching>
+<Embroidery and Embellishment, connectedTo, Distribution>
+<Embroidery and Embellishment, connectedTo, Intellectual Property Protection>
+<Embroidery and Embellishment, connectedTo, Material Sourcing>
+<Embroidery and Embellishment, connectedTo, Retail Sales>
+<Fashion Show Production, connectedTo, Inventory Management>
+<Fashion Show Production, partOf, Fashion Show Production>
+<Footwear Production, connectedTo, Brand Licensing>
+<Footwear Production, connectedTo, Embroidery and Embellishment>
+<Footwear Production, connectedTo, Seasonal Collection Planning>
+<Intellectual Property Protection, connectedTo, Brand Licensing>
+<Intellectual Property Protection, connectedTo, Material Sourcing>
+<Inventory Management, connectedTo, Footwear Production>
+<Inventory Management, partOf, Inventory Management>
+<Marketing Campaign, connectedTo, Ready_to_Wear Collection Launch>
+<Marketing Campaign, partOf, Marketing Campaign>
+<Material Sourcing, videos, Brand Licensing>
+<Pattern Making, connectedTo, Footwear Production>
+<Pattern Making, sells, Distribution>
+<Ready_to_Wear Collection Launch, connectedTo, E_commerce Management>
+<Ready_to_Wear Collection Launch, partOf, Ready_to_Wear Collection Launch>
+<Retail Sales, connectedTo, Seasonal Collection Planning>
+<Retail Store Merchandising, connectedTo, Color Palette Selection>
+<Retail Store Merchandising, connectedTo, Pattern Making>
+<Sample Creation, connectedTo, Retail Sales>
+<Seasonal Collection Planning, connectedTo, Design Sketching>
+<Seasonal Collection Planning, connectedTo, Marketing Campaign>
diff --git a/test/graphviz/scanned_hard/graphviz_274.txt b/test/graphviz/scanned_hard/graphviz_274.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ed580b2999ea1745b30c4f0eaeff23703cd6aac9
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_274.txt
@@ -0,0 +1,45 @@
+<Applicant Tracking System Management, connectedTo, Compliance in Hiring>
+<Applicant Tracking System Management, connectedTo, Global Recruitment Strategy>
+<Applicant Tracking System Management, connectedTo, Temporary Staffing>
+<Applicant Tracking System Management, protects, Candidate Relationship Management>
+<Background Check, connectedTo, Offer Extension>
+<Campus Recruitment, connectedTo, Job Description Creation>
+<Candidate Assessment Design, connectedTo, Global Recruitment Strategy>
+<Candidate Experience Management, connectedTo, Internal Mobility>
+<Candidate Experience Management, partOf, Candidate Experience Management>
+<Candidate Feedback Collection, connectedTo, Campus Recruitment>
+<Candidate Feedback Collection, connectedTo, Competency_Based Interviewing>
+<Candidate Feedback Collection, connectedTo, Passive Candidate Engagement>
+<Candidate Relationship Management, connectedTo, Interview Conducting>
+<Candidate Relationship Management, places, Candidate Assessment Design>
+<Candidate Screening, connectedTo, Candidate Assessment Design>
+<Candidate Screening, connectedTo, Compliance in Hiring>
+<Candidate Screening, connectedTo, Global Recruitment Strategy>
+<Candidate Screening, connectedTo, Recruiter Training>
+<Candidate Screening, connectedTo, Temporary Staffing>
+<Competency_Based Interviewing, connectedTo, Talent Pipeline Building>
+<Competency_Based Interviewing, partOf, Competency_Based Interviewing>
+<Compliance in Hiring, connectedTo, Temporary Staffing>
+<Executive Search, connectedTo, Passive Candidate Engagement>
+<Executive Search, partOf, Executive Search>
+<Global Recruitment Strategy, connectedTo, Compliance in Hiring>
+<Internal Mobility, connectedTo, Passive Candidate Engagement>
+<Internal Mobility, partOf, Internal Mobility>
+<Interview Conducting, builds, Candidate Experience Management>
+<Interview Conducting, partOf, Interview Conducting>
+<Interview Panel Coordination, interviews, Executive Search>
+<Interview Panel Coordination, partOf, Interview Panel Coordination>
+<Job Description Creation, connectedTo, Candidate Assessment Design>
+<Job Description Creation, sources, Recruitment Process Outsourcing Management>
+<Job Fair Organization, connectedTo, Candidate Screening>
+<Offer Extension, connectedTo, Job Fair Organization>
+<Passive Candidate Engagement, brands, Campus Recruitment>
+<Recruiter Training, connectedTo, Applicant Tracking System Management>
+<Recruitment Marketing, connectedTo, Campus Recruitment>
+<Recruitment Marketing, connectedTo, Candidate Feedback Collection>
+<Recruitment Metrics Reporting, connectedTo, Campus Recruitment>
+<Recruitment Metrics Reporting, connectedTo, Recruitment Marketing>
+<Recruitment Process Outsourcing Management, connectedTo, Background Check>
+<Recruitment Process Outsourcing Management, connectedTo, Candidate Assessment Design>
+<Talent Pipeline Building, connectedTo, Interview Panel Coordination>
+<Talent Pipeline Building, partOf, Talent Pipeline Building>
diff --git a/test/graphviz/scanned_hard/graphviz_275.dot b/test/graphviz/scanned_hard/graphviz_275.dot
new file mode 100644
index 0000000000000000000000000000000000000000..65e88d9bf3113584f532f79886b0c534c42b41e2
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_275.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=RL
+	N0 [label="Refund Processing" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Service Level Agreement Monitoring" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N2 [label="Training Customer Service Agents" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N3 [label="Feedback Loop to Product Development" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N4 [label="Inquiry Handling" color="#BDAFA8" fillcolor="#E4E0DF" shape=diamond style=filled]
+	N5 [label="First Contact Resolution Optimization" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N6 [label="Accessibility Support" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N7 [label="Multilingual Support" color="#BDAFA8" fillcolor="#E4E0DF" shape=oval style=filled]
+	N8 [label="Knowledge Base Creation" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N9 [label="Phone Support" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N10 [label="Customer Onboarding Support" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+	N11 [label="Customer Journey Mapping" color="#FFCC7A" fillcolor="#FFF6D9" shape=octagon style=filled]
+	N12 [label="Customer Retention Strategies" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+	N13 [label="Self_Service Portal Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N14 [label="Personalized Assistance" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N15 [label="Account Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	S0 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Post_Service Follow_up" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Order Status Check" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+		nest0_1 [label="Email Support" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+		nest0_0 -> nest0_1 [label=complies color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Customer Success Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Issue Escalation" color="#FFCC7A" fillcolor="#FFF6D9" shape=Mdiamond style=filled]
+		nest1_1 [label="Proactive Communication" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+		nest1_2 [label="Social Media Response" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+		nest1_3 [label="Complaint Resolution" color="#FFCC7A" fillcolor="#FFF6D9" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=secures color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=personals color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest0_0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N12 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N12 -> nest1_0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N15 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N4 -> M2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_276.txt b/test/graphviz/scanned_hard/graphviz_276.txt
new file mode 100644
index 0000000000000000000000000000000000000000..01178353fa648ea623a543b0ecc8260780add80f
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_276.txt
@@ -0,0 +1,42 @@
+<Blockchain for Traceability, connectedTo, Intermodal Transportation>
+<Blockchain for Traceability, connectedTo, Predictive Analytics>
+<Blockchain for Traceability, connectedTo, Vendor Managed Inventory>
+<Circular Economy Practices, connectedTo, Contract Manufacturing Oversight>
+<Circular Economy Practices, connectedTo, Predictive Analytics>
+<Cold Chain Logistics, connectedTo, Warehouse Automation>
+<Cold Chain Logistics, partOf, Cold Chain Logistics>
+<Collaborative Planning, distributes, Sustainability Initiatives>
+<Collaborative Planning, partOf, Collaborative Planning>
+<Contract Manufacturing Oversight, connectedTo, Performance Monitoring>
+<Data Analytics for Supply Chain, connectedTo, Material Flow Management>
+<Distribution Network Design, connectedTo, Supplier Relationship Management>
+<Global Sourcing Strategy, connectedTo, Vendor Managed Inventory>
+<Intermodal Transportation, connectedTo, Reverse Logistics>
+<Last_Mile Delivery Optimization, connectedTo, Distribution Network Design>
+<Last_Mile Delivery Optimization, connectedTo, Procurement>
+<Material Flow Management, inspects, Circular Economy Practices>
+<Order Fulfillment, connectedTo, Warehousing>
+<Order Fulfillment, partOf, Order Fulfillment>
+<Performance Monitoring, connectedTo, Predictive Analytics>
+<Performance Monitoring, connectedTo, Transportation Management>
+<Performance Monitoring, regulates, Supply Chain Finance>
+<Predictive Analytics, connectedTo, Order Fulfillment>
+<Predictive Analytics, connectedTo, Transportation Management>
+<Procurement, connectedTo, Collaborative Planning>
+<Procurement, partOf, Procurement>
+<Reverse Logistics, connectedTo, Circular Economy Practices>
+<Reverse Logistics, connectedTo, Global Sourcing Strategy>
+<Reverse Logistics, connectedTo, Third_Party Logistics Management>
+<Reverse Logistics, connectedTo, Vendor Managed Inventory>
+<Supplier Relationship Management, connectedTo, Data Analytics for Supply Chain>
+<Sustainability Initiatives, connectedTo, Material Flow Management>
+<Sustainability Initiatives, partOf, Sustainability Initiatives>
+<Third_Party Logistics Management, connectedTo, Global Sourcing Strategy>
+<Third_Party Logistics Management, connectedTo, Predictive Analytics>
+<Third_Party Logistics Management, connectedTo, Vendor Managed Inventory>
+<Transportation Management, connectedTo, Supply Chain Finance>
+<Vendor Managed Inventory, forecasts, Last_Mile Delivery Optimization>
+<Warehouse Automation, connectedTo, Vendor Managed Inventory>
+<Warehouse Automation, partOf, Warehouse Automation>
+<Warehousing, connectedTo, Cold Chain Logistics>
+<Warehousing, partOf, Warehousing>
diff --git a/test/graphviz/scanned_hard/graphviz_278.txt b/test/graphviz/scanned_hard/graphviz_278.txt
new file mode 100644
index 0000000000000000000000000000000000000000..84b54546886a15f92592fa5f44ed4e6cf5d1c258
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_278.txt
@@ -0,0 +1,43 @@
+<Ballast Water Management, charts, Container Tracking>
+<Ballast Water Management, connectedTo, Digitalization of Shipping>
+<Cargo Loading, connectedTo, Ballast Water Management>
+<Cargo Loading, partOf, Cargo Loading>
+<Container Tracking, connectedTo, Port Operations>
+<Crew Management, connectedTo, Search and Rescue Coordination>
+<Crew Management, partOf, Crew Management>
+<Customs Clearance, connectedTo, Container Tracking>
+<Customs Clearance, connectedTo, Maritime Law Compliance>
+<Digitalization of Shipping, connectedTo, Navigation>
+<Fleet Management, connectedTo, Ship Registry>
+<Fleet Management, monitors, Vessel Maintenance>
+<Fuel Consumption Optimization, connectedTo, Vessel Maintenance>
+<Fuel Consumption Optimization, repairs, Inland Waterway Transport>
+<Green Shipping Initiatives, connectedTo, Vessel Chartering>
+<Hydrographic Surveying, connectedTo, Vessel Maintenance>
+<Inland Waterway Transport, connectedTo, Ballast Water Management>
+<Inland Waterway Transport, connectedTo, Digitalization of Shipping>
+<Inland Waterway Transport, connectedTo, Navigation>
+<Inland Waterway Transport, connectedTo, Vessel Maintenance>
+<Marine Safety Inspection, connectedTo, Green Shipping Initiatives>
+<Maritime Law Compliance, connectedTo, Search and Rescue Coordination>
+<Navigation, connectedTo, Route Planning>
+<Navigation, connectedTo, Shipbuilding>
+<Navigation, connectedTo, Vessel Maintenance>
+<Navigation, connectedTo, Voyage Optimization>
+<Pilotage, connectedTo, Container Tracking>
+<Port Operations, connectedTo, Green Shipping Initiatives>
+<Port Operations, connectedTo, Marine Safety Inspection>
+<Port Operations, connectedTo, Salvage Operations>
+<Port Operations, connectedTo, Vessel Chartering>
+<Route Planning, connectedTo, Crew Management>
+<Route Planning, partOf, Route Planning>
+<Search and Rescue Coordination, connectedTo, Pilotage>
+<Ship Registry, connectedTo, Fuel Consumption Optimization>
+<Shipbuilding, connectedTo, Cargo Loading>
+<Shipbuilding, partOf, Shipbuilding>
+<Subsea Cable Laying, connectedTo, Hydrographic Surveying>
+<Terminal Management, connectedTo, Fleet Management>
+<Vessel Chartering, connectedTo, Salvage Operations>
+<Vessel Maintenance, connectedTo, Customs Clearance>
+<Voyage Optimization, connectedTo, Container Tracking>
+<Voyage Optimization, connectedTo, Subsea Cable Laying>
diff --git a/test/graphviz/scanned_hard/graphviz_279.dot b/test/graphviz/scanned_hard/graphviz_279.dot
new file mode 100644
index 0000000000000000000000000000000000000000..316d7cb4720d338cfa23a25795636d32eca08c4a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_279.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=RL
+	N0 [label="In_Situ Resource Utilization" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N1 [label="Autonomous Rendezvous and Docking" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N2 [label="Re_entry Vehicle Design" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N3 [label="Planetary Science Research" color="#CDDC39" fillcolor="#E6EE9C" shape=folder style=filled]
+	N4 [label="Data Acquisition" color="#CDDC39" fillcolor="#E6EE9C" shape=Mdiamond style=filled]
+	N5 [label="Interplanetary Trajectory Calculation" color="#4285F4" fillcolor="#D0E0F8" shape=folder style=filled]
+	N6 [label="Scientific Data Analysis" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N7 [label="Space Habitat Development" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N8 [label="Space Weather Forecasting" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	S0 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Robotics for Space Exploration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Astronaut Training" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+		nest0_1 [label="Asteroid Mining Feasibility" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Extravehicular Activity Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Spacecraft Control" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+		nest1_1 [label="Ground Station Operations" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+		nest1_2 [label="Mission Control Center Management" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+		nest1_3 [label="Deep Space Communications" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [label=controls color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=warns color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N6 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S2 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [label=coordinates color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_280.dot b/test/graphviz/scanned_hard/graphviz_280.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f3614bf87b1357b02bfed0d650d3b29969a3bca9
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_280.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=RL
+	N0 [label="Climate Finance Tracking" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N1 [label="Indigenous Knowledge Integration" color="#D2D2D2" fillcolor="#F0F0F0" shape=octagon style=filled]
+	N2 [label="Greenhouse Gas Measurement" color="#FFEB3B" fillcolor="#FFF9C4" shape=oval style=filled]
+	N3 [label="Adaptation Strategy Development" color="#A1D7CD" fillcolor="#EDF5F3" shape=folder style=filled]
+	N4 [label="Climate Impact Assessment" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N5 [label="Aerosol Impact Assessment" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N6 [label="Climate Change Vulnerability Assessment" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N7 [label="Environmental Justice Study" color="#A1D7CD" fillcolor="#EDF5F3" shape=plaintext style=filled]
+	N8 [label="Climate Modeling" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	N9 [label="Extreme Weather Event Analysis" color="#D2D2D2" fillcolor="#F0F0F0" shape=hexagon style=filled]
+	N10 [label="Data Collection" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N11 [label="Mitigation Technology Evaluation" color="#D2D2D2" fillcolor="#F0F0F0" shape=Mdiamond style=filled]
+	N12 [label="Ocean Acidification Studies" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	S0 [label="" color="#D2D2D2" fillcolor="#F0F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Remote Sensing for Climate" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Renewable Energy Potential Assessment" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+		nest0_1 [label="Climate Education Programs" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+		nest0_2 [label="Carbon Cycle Research" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest0_3 [label="Ecological Footprint Calculation" color="#D2D2D2" fillcolor="#F0F0F0" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Ocean Current Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Water Resource Management under Climate Change" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+		nest1_1 [label="Cloud Formation Research" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+		nest1_2 [label="Climate Resilient Agriculture" color="#FFEB3B" fillcolor="#FFF9C4" shape=oval style=filled]
+		nest1_3 [label="Permafrost Thaw Assessment" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
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+	N10 -> nest0_0 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
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+	nest1_3 -> N7 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
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+	S0 -> N11 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_281.dot b/test/graphviz/scanned_hard/graphviz_281.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f8c13bcc13b92f524f3f3015994ea3d05510fbd2
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_281.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=LR
+	N0 [label="Storm Tracking" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Meteorological Station Maintenance" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N2 [label="Tornado Watch or Warning" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N3 [label="Numerical Weather Prediction" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N4 [label=Nowcasting color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N5 [label="Boundary Layer Study" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N6 [label="Satellite Meteorology" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N7 [label="Pollution Dispersion Modeling" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N8 [label="Severe Weather Warning" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N9 [label="Lightning Detection" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N10 [label="Synoptic Chart Analysis" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N11 [label="Air Quality Forecasting" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N12 [label="Tropical Cyclone Analysis" color="#388E3C" fillcolor="#C8E6C9" shape=octagon style=filled]
+	N13 [label="Atmospheric Data Collection" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N14 [label="Weather Forecasting" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Cloud Observation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Public Weather Briefing" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+		nest0_1 [label="Atmospheric Sounding" color="#388E3C" fillcolor="#C8E6C9" shape=folder style=filled]
+		nest0_2 [label="Ocean_Atmosphere Interaction Study" color="#388E3C" fillcolor="#C8E6C9" shape=Mdiamond style=filled]
+		nest0_3 [label="Humidity Sensing" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Wind Speed and Direction" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Climate Modeling" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+		nest1_1 [label="Meteorological Instrument Calibration" color="#388E3C" fillcolor="#C8E6C9" shape=Mdiamond style=filled]
+		nest1_2 [label="Precipitation Measurement" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=analyzes color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=predicts color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=retrieves color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [label=generates color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N2 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N10 -> S1 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> N13 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_282.txt b/test/graphviz/scanned_hard/graphviz_282.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e631f5ba53414e6c4d6536a24a0279a90e109aae
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_282.txt
@@ -0,0 +1,31 @@
+<Anaerobic Digestion, connectedTo, Community Recycling Programs>
+<Anaerobic Digestion, partOf, Anaerobic Digestion>
+<Biomedical Waste Handling, connectedTo, Glass Recycling>
+<Biomedical Waste Handling, connectedTo, Waste Compaction>
+<Circular Economy Initiatives, connectedTo, Material Recovery Facility Operation>
+<Circular Economy Initiatives, partOf, Circular Economy Initiatives>
+<Community Recycling Programs, connectedTo, Circular Economy Initiatives>
+<Community Recycling Programs, partOf, Community Recycling Programs>
+<Glass Recycling, connectedTo, Waste Compaction>
+<Glass Recycling, connectedTo, Waste Logistics Optimization>
+<Landfill Operation, connectedTo, Waste_to_Energy Conversion>
+<Material Recovery Facility Operation, connectedTo, Waste Characterization Study>
+<Material Recovery Facility Operation, partOf, Material Recovery Facility Operation>
+<Metal Recycling, connectedTo, Biomedical Waste Handling>
+<Metal Recycling, connectedTo, Glass Recycling>
+<Metal Recycling, connectedTo, Landfill Operation>
+<Metal Recycling, connectedTo, Waste Compaction>
+<Metal Recycling, maintains, Extended Producer Responsibility>
+<Organics Collection, transports, Landfill Operation>
+<Recycling Processing, connectedTo, Glass Recycling>
+<Recycling Processing, connectedTo, Metal Recycling>
+<Recycling Processing, connectedTo, Waste Compaction>
+<Waste Characterization Study, connectedTo, Waste Reduction Planning>
+<Waste Compaction, connectedTo, Organics Collection>
+<Waste Incineration, connectedTo, Waste Compaction>
+<Waste Incineration, partOf, Waste Incineration>
+<Waste Logistics Optimization, partOf, Waste Logistics Optimization>
+<Waste Logistics Optimization, segregates, Waste Incineration>
+<Waste Reduction Planning, connectedTo, Anaerobic Digestion>
+<Waste Reduction Planning, connectedTo, Extended Producer Responsibility>
+<Waste_to_Energy Conversion, connectedTo, Waste Characterization Study>
diff --git a/test/graphviz/scanned_hard/graphviz_283.txt b/test/graphviz/scanned_hard/graphviz_283.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f9adb5cefa457726bff75fc8ea3f919062cb9e16
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_283.txt
@@ -0,0 +1,42 @@
+<Aquifer Recharge, connectedTo, Groundwater Management>
+<Dam Management, connectedTo, Aquifer Recharge>
+<Dam Management, connectedTo, Industrial Water Use Optimization>
+<Desalination, connectedTo, Industrial Water Use Optimization>
+<Desalination, connectedTo, Water Distribution>
+<Drinking Water Standards Compliance, connectedTo, Dam Management>
+<Drought Management, connectedTo, Ecosystem Protection>
+<Ecosystem Protection, connectedTo, Hydrological Modeling>
+<Ecosystem Protection, connectedTo, Rainwater Harvesting>
+<Ecosystem Protection, connectedTo, Water Source Identification>
+<Flood Control, connectedTo, Smart Water Networks>
+<Flood Control, partOf, Flood Control>
+<Greywater Recycling, connectedTo, Desalination>
+<Groundwater Management, connectedTo, Industrial Water Use Optimization>
+<Hydrological Modeling, connectedTo, Wastewater Treatment>
+<Industrial Water Use Optimization, evaluates, Reservoir Operation>
+<Irrigation Management, connectedTo, Smart Water Networks>
+<Rainwater Harvesting, connectedTo, Hydrological Modeling>
+<Rainwater Harvesting, connectedTo, Irrigation Management>
+<Rainwater Harvesting, connectedTo, Wastewater Treatment>
+<Rainwater Harvesting, connectedTo, Water Conservation Planning>
+<Reservoir Operation, connectedTo, Irrigation Management>
+<Stormwater Management, connectedTo, Flood Control>
+<Stormwater Management, partOf, Stormwater Management>
+<Transboundary Water Management, connectedTo, Wastewater Treatment>
+<Transboundary Water Management, partOf, Transboundary Water Management>
+<Wastewater Treatment, connectedTo, Greywater Recycling>
+<Wastewater Treatment, connectedTo, Groundwater Management>
+<Wastewater Treatment, connectedTo, Industrial Water Use Optimization>
+<Wastewater Treatment, connectedTo, Water Quality Monitoring>
+<Water Conservation Planning, connectedTo, Hydrological Modeling>
+<Water Conservation Planning, connectedTo, Water Infrastructure Maintenance>
+<Water Distribution, connectedTo, Water Quality Monitoring>
+<Water Infrastructure Maintenance, connectedTo, Water Scarcity Mitigation>
+<Water Infrastructure Maintenance, partOf, Water Infrastructure Maintenance>
+<Water Quality Monitoring, connectedTo, Drinking Water Standards Compliance>
+<Water Scarcity Mitigation, connectedTo, Stormwater Management>
+<Water Scarcity Mitigation, partOf, Water Scarcity Mitigation>
+<Water Source Identification, connectedTo, Watershed Management>
+<Water Source Identification, partOf, Water Source Identification>
+<Watershed Management, connectedTo, Transboundary Water Management>
+<Watershed Management, partOf, Watershed Management>
diff --git a/test/graphviz/scanned_hard/graphviz_285.txt b/test/graphviz/scanned_hard/graphviz_285.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c373343303cb657fe56db9943b2d4395c7cb6f9b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_285.txt
@@ -0,0 +1,39 @@
+<Afforestation, connectedTo, Forest Road Construction>
+<Biodiversity Conservation in Forests, connectedTo, Forest Fire Management>
+<Biodiversity Conservation in Forests, partOf, Biodiversity Conservation in Forests>
+<Drone Surveying for Forests, connectedTo, Wood Product Manufacturing>
+<Ecological Restoration, connectedTo, Public Access Management>
+<Erosion Control, connectedTo, Afforestation>
+<Erosion Control, connectedTo, Pest and Disease Control>
+<Erosion Control, connectedTo, Timber Harvesting>
+<Erosion Control, monitors, Forest Inventory>
+<Forest Fire Management, connectedTo, Drone Surveying for Forests>
+<Forest Fire Management, connectedTo, Forest Land Use Planning>
+<Forest Fire Management, connectedTo, Pest and Disease Control>
+<Forest Fire Management, connectedTo, Reforestation>
+<Forest Fire Management, connectedTo, Sustainable Forest Management>
+<Forest Fire Management, connectedTo, Timber Harvesting>
+<Forest Fire Management, connectedTo, Watershed Protection>
+<Forest Fire Management, prevents, Afforestation>
+<Forest Inventory, surveys, Logging Operations>
+<Forest Land Use Planning, connectedTo, Erosion Control>
+<Forestry Education, connectedTo, Sawmill Processing>
+<Forestry Education, partOf, Forestry Education>
+<Logging Operations, connectedTo, Afforestation>
+<Pest and Disease Control, connectedTo, Timber Harvesting>
+<Public Access Management, connectedTo, Forest Fire Management>
+<Public Access Management, connectedTo, Forestry Education>
+<Public Access Management, connectedTo, Logging Operations>
+<Public Access Management, connectedTo, Watershed Protection>
+<Reforestation, connectedTo, Watershed Protection>
+<Sawmill Processing, connectedTo, Urban Forestry Management>
+<Sawmill Processing, partOf, Sawmill Processing>
+<Sustainable Forest Management, connectedTo, Biodiversity Conservation in Forests>
+<Sustainable Forest Management, partOf, Sustainable Forest Management>
+<Timber Harvesting, connectedTo, Forest Inventory>
+<Tree Nursery Management, connectedTo, Ecological Restoration>
+<Urban Forestry Management, connectedTo, Reforestation>
+<Urban Forestry Management, partOf, Urban Forestry Management>
+<Watershed Protection, cultivates, Drone Surveying for Forests>
+<Wood Product Manufacturing, connectedTo, Logging Operations>
+<Wood Product Manufacturing, harvests, Forest Land Use Planning>
diff --git a/test/graphviz/scanned_hard/graphviz_288.txt b/test/graphviz/scanned_hard/graphviz_288.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9c4e0f06a76568ed86c9828489a38d9b101e609b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_288.txt
@@ -0,0 +1,34 @@
+<Care Plan Development, connectedTo, Caregiver Training>
+<Care Plan Development, partOf, Care Plan Development>
+<Caregiver Training, connectedTo, Speech Therapy>
+<Caregiver Training, partOf, Caregiver Training>
+<Chronic Disease Management, connectedTo, Fall Prevention>
+<Chronic Disease Management, connectedTo, Home Health Aide Services>
+<Chronic Disease Management, connectedTo, Smart Home Integration for Seniors>
+<Emergency Response System Monitoring, connectedTo, Occupational Therapy>
+<Emergency Response System Monitoring, connectedTo, Palliative Care>
+<Emergency Response System Monitoring, connectedTo, Respite Care>
+<Emergency Response System Monitoring, connectedTo, Social Engagement Activities>
+<Emotional Support and Counseling, connectedTo, Occupational Therapy>
+<Emotional Support and Counseling, connectedTo, Physical Therapy>
+<Fall Prevention, connectedTo, Smart Home Integration for Seniors>
+<Fall Prevention, connectedTo, Transportation Assistance>
+<Family Communication, connectedTo, Smart Home Integration for Seniors>
+<Home Health Aide Services, connectedTo, Nutritional Assessment>
+<Home Health Aide Services, partOf, Home Health Aide Services>
+<Nutritional Assessment, connectedTo, Recreational Activities Planning>
+<Nutritional Assessment, partOf, Nutritional Assessment>
+<Occupational Therapy, connectedTo, Family Communication>
+<Palliative Care, connectedTo, Occupational Therapy>
+<Physical Therapy, connectedTo, Chronic Disease Management>
+<Recreational Activities Planning, connectedTo, Family Communication>
+<Recreational Activities Planning, partOf, Recreational Activities Planning>
+<Respite Care, connectedTo, Care Plan Development>
+<Respite Care, partOf, Respite Care>
+<Social Engagement Activities, assesses, Occupational Therapy>
+<Social Engagement Activities, connectedTo, Palliative Care>
+<Speech Therapy, connectedTo, Social Engagement Activities>
+<Speech Therapy, partOf, Speech Therapy>
+<Transportation Assistance, connectedTo, Emergency Response System Monitoring>
+<Transportation Assistance, connectedTo, Family Communication>
+<Transportation Assistance, connectedTo, Social Engagement Activities>
diff --git a/test/graphviz/scanned_hard/graphviz_289.dot b/test/graphviz/scanned_hard/graphviz_289.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0041c445034e4de8005a38a38a2afd1814ba697d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_289.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=LR
+	N0 [label="Search and Rescue Operations" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Logistics and Supply Chain" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N2 [label="Climate Change Adaptation for Disasters" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N3 [label="Early Recovery Actions" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N4 [label="Satellite Imagery Analysis" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N5 [label="Environmental Remediation" color="#FBC02D" fillcolor="#FFFDE7" shape=folder style=filled]
+	N6 [label="Geographic Information Systems for Disasters" color="#FBC02D" fillcolor="#FFFDE7" shape=octagon style=filled]
+	N7 [label="Communication Protocols" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N8 [label="Emergency Response" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N9 [label="Volunteer Coordination" color="#FFF8A6" fillcolor="#FFFDE0" shape=diamond style=filled]
+	N10 [label="Information Dissemination" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	S0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Resilience Building" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Shelter Management" color="#FBC02D" fillcolor="#FFFDE7" shape=folder style=filled]
+		nest0_1 [label="Community Preparedness" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Emergency Drills and Exercises" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Damage Assessment" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest1_1 [label="Vulnerability Analysis" color="#FBC02D" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+		nest1_2 [label="Economic Recovery Initiatives" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N4 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N5 -> S2 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_29.dot b/test/graphviz/scanned_hard/graphviz_29.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f53f266bfab43b8a205382d4d200de28c0c49475
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_29.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=TD
+	N0 [label="Print Layout" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N1 [label="Virtual Reality Content Creation" color="#E57373" fillcolor="#FFEBEE" shape=octagon style=filled]
+	N2 [label=Broadcasting color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N3 [label="Data Monetization" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N4 [label=Scriptwriting color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N5 [label="Content Moderation" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N6 [label="Event Organization" color="#00BCD4" fillcolor="#E0F7FA" shape=octagon style=filled]
+	N7 [label=Photojournalism color="#00BCD4" fillcolor="#E0F7FA" shape=oval style=filled]
+	N8 [label="Music Recording" color="#E57373" fillcolor="#FFEBEE" shape=octagon style=filled]
+	N9 [label="Copyright Management" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N0 -> N1 [label=writes color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=curates color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=complies color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=promotes color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=reports color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=composes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N7 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_29.txt b/test/graphviz/scanned_hard/graphviz_29.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6bbf1ebaf996fab399f3173982511b139521e0a1
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_29.txt
@@ -0,0 +1,10 @@
+<Broadcasting, curates, Data Monetization>
+<Content Moderation, promotes, Event Organization>
+<Data Monetization, connectedTo, Scriptwriting>
+<Event Organization, connectedTo, Photojournalism>
+<Music Recording, composes, Copyright Management>
+<Photojournalism, reports, Music Recording>
+<Print Layout, writes, Virtual Reality Content Creation>
+<Scriptwriting, complies, Content Moderation>
+<Virtual Reality Content Creation, connectedTo, Broadcasting>
+<Virtual Reality Content Creation, connectedTo, Photojournalism>
diff --git a/test/graphviz/scanned_hard/graphviz_290.txt b/test/graphviz/scanned_hard/graphviz_290.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0bdb8b3cb197bfb175e8d9118538e624cfa773b4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_290.txt
@@ -0,0 +1,38 @@
+<Basic Training, connectedTo, Chaplain Services>
+<Basic Training, connectedTo, Civil_Military Cooperation>
+<Basic Training, connectedTo, Demobilization>
+<Basic Training, connectedTo, Military Strategy Development>
+<Basic Training, connectedTo, Rules of Engagement>
+<Basic Training, connectedTo, Supply Chain Management>
+<Chaplain Services, connectedTo, Surveillance>
+<Chaplain Services, maintains, Military Strategy Development>
+<Civil_Military Cooperation, connectedTo, Chaplain Services>
+<Civil_Military Cooperation, connectedTo, Counter_Insurgency Operations>
+<Civil_Military Cooperation, connectedTo, Supply Chain Management>
+<Counter_Insurgency Operations, connectedTo, Counter_Terrorism Operations>
+<Counter_Insurgency Operations, partOf, Counter_Insurgency Operations>
+<Counter_Terrorism Operations, connectedTo, Military Law>
+<Counter_Terrorism Operations, partOf, Counter_Terrorism Operations>
+<Cyber Warfare Operations, connectedTo, Ground Operations>
+<Demobilization, connectedTo, Family Support Programs>
+<Equipment Maintenance, connectedTo, Readiness Assessment>
+<Equipment Maintenance, partOf, Equipment Maintenance>
+<Family Support Programs, connectedTo, Veteran Support>
+<Military Law, connectedTo, Personnel Management>
+<Military Strategy Development, connectedTo, Demobilization>
+<Naval Operations, connectedTo, Basic Training>
+<Naval Operations, connectedTo, Supply Chain Management>
+<Personnel Management, trains, Cyber Warfare Operations>
+<Readiness Assessment, connectedTo, Chaplain Services>
+<Readiness Assessment, partOf, Readiness Assessment>
+<Rules of Engagement, connectedTo, Equipment Maintenance>
+<Rules of Engagement, connectedTo, Military Strategy Development>
+<Rules of Engagement, connectedTo, Supply Chain Management>
+<Supply Chain Management, connectedTo, Military Strategy Development>
+<Surveillance, connectedTo, Military Strategy Development>
+<Surveillance, connectedTo, Rules of Engagement>
+<Targeting, connectedTo, Cyber Warfare Operations>
+<Targeting, connectedTo, Ground Operations>
+<Targeting, connectedTo, Personnel Management>
+<Targeting, tests, Military Law>
+<Veteran Support, connectedTo, Targeting>
diff --git a/test/graphviz/scanned_hard/graphviz_291.dot b/test/graphviz/scanned_hard/graphviz_291.dot
new file mode 100644
index 0000000000000000000000000000000000000000..66c7429e59fec27fe49c88ad0ee5895d68ced9b5
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_291.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=BT
+	N0 [label="Unmanned Aerial Vehicle Integration" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N1 [label="Aircraft De_icing" color="#BDAFA8" fillcolor="#E4E0DF" shape=diamond style=filled]
+	N2 [label="Emergency Procedures Training" color="#82DAFF" fillcolor="#C8EDFF" shape=parallelogram style=filled]
+	N3 [label="Air Cargo Logistics" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N4 [label="Aircraft Manufacturing" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N5 [label="Airworthiness Certification" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N6 [label="Aviation Safety Investigation" color="#82DAFF" fillcolor="#C8EDFF" shape=plaintext style=filled]
+	N7 [label="Delay Management" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+	N8 [label="Air Traffic Control" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N9 [label="In_flight Service" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N10 [label="Sustainable Aviation Fuel Development" color="#FFEB3B" fillcolor="#FFF9C4" shape=octagon style=filled]
+	N11 [label="Regulatory Compliance" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N12 [label="Cargo Loading" color="#BDAFA8" fillcolor="#E4E0DF" shape=octagon style=filled]
+	N13 [label="Navigation System Check" color="#82DAFF" fillcolor="#C8EDFF" shape=octagon style=filled]
+	N14 [label="Noise Abatement Procedures" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N15 [label="Airport Security Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=octagon style=filled]
+	N16 [label="Flight Simulation" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	S1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Crew Scheduling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Crew Resource Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=oval style=filled]
+		nest0_1 [label="Pilot Training" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Remote Tower Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Ground Support" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+		nest1_1 [label="Fleet Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+		nest1_2 [label="Baggage Handling" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+		nest1_3 [label="Flight Planning" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=optimizes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N11 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N13 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N9 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	M1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M2 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N4 -> M2 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M2 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	M2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_291.txt b/test/graphviz/scanned_hard/graphviz_291.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1cd730adbdab75ba3b9154202d5dab76cf0aa2df
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_291.txt
@@ -0,0 +1,43 @@
+<Air Cargo Logistics, connectedTo, Navigation System Check>
+<Air Cargo Logistics, optimizes, Aircraft Manufacturing>
+<Air Traffic Control, connectedTo, In_flight Service>
+<Aircraft De_icing, connectedTo, Crew Resource Management>
+<Aircraft De_icing, connectedTo, Emergency Procedures Training>
+<Aircraft Manufacturing, connectedTo, Air Traffic Control>
+<Aircraft Manufacturing, connectedTo, Airworthiness Certification>
+<Aircraft Manufacturing, connectedTo, Flight Simulation>
+<Aircraft Manufacturing, connectedTo, In_flight Service>
+<Aircraft Manufacturing, connectedTo, Navigation System Check>
+<Aircraft Manufacturing, connectedTo, Regulatory Compliance>
+<Airport Security Management, connectedTo, Flight Simulation>
+<Airworthiness Certification, connectedTo, Aviation Safety Investigation>
+<Airworthiness Certification, connectedTo, In_flight Service>
+<Airworthiness Certification, connectedTo, Navigation System Check>
+<Aviation Safety Investigation, connectedTo, Delay Management>
+<Baggage Handling, connectedTo, Flight Planning>
+<Baggage Handling, partOf, Baggage Handling>
+<Cargo Loading, connectedTo, Navigation System Check>
+<Crew Resource Management, connectedTo, Pilot Training>
+<Crew Resource Management, partOf, Crew Resource Management>
+<Delay Management, connectedTo, Air Traffic Control>
+<Delay Management, connectedTo, In_flight Service>
+<Emergency Procedures Training, connectedTo, Air Cargo Logistics>
+<Emergency Procedures Training, connectedTo, Air Traffic Control>
+<Emergency Procedures Training, connectedTo, Delay Management>
+<Emergency Procedures Training, connectedTo, In_flight Service>
+<Fleet Management, connectedTo, Baggage Handling>
+<Fleet Management, partOf, Fleet Management>
+<Flight Planning, connectedTo, Navigation System Check>
+<Flight Planning, partOf, Flight Planning>
+<Ground Support, connectedTo, Fleet Management>
+<Ground Support, partOf, Ground Support>
+<In_flight Service, connectedTo, Ground Support>
+<In_flight Service, connectedTo, Navigation System Check>
+<In_flight Service, connectedTo, Sustainable Aviation Fuel Development>
+<Navigation System Check, connectedTo, Noise Abatement Procedures>
+<Noise Abatement Procedures, connectedTo, Airport Security Management>
+<Pilot Training, connectedTo, Regulatory Compliance>
+<Pilot Training, partOf, Pilot Training>
+<Regulatory Compliance, connectedTo, Cargo Loading>
+<Sustainable Aviation Fuel Development, connectedTo, Regulatory Compliance>
+<Unmanned Aerial Vehicle Integration, connectedTo, Aircraft De_icing>
diff --git a/test/graphviz/scanned_hard/graphviz_293.dot b/test/graphviz/scanned_hard/graphviz_293.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6a7adf5014bf2c6ae84b35d74198ab26ac704bbd
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_293.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=RL
+	N0 [label="Rapid Manufacturing" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Distributed Manufacturing" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N2 [label="Digital Twin for 3D Prints" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N3 [label="Reverse Engineering with 3D Printing" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N4 [label="Food Printing" color="#5C6BC0" fillcolor="#E8EAF6" shape=plaintext style=filled]
+	N5 [label="Additive Manufacturing" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N6 [label=Post_Processing color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N7 [label="Direct Metal Laser Sintering" color="#E57373" fillcolor="#FFEBEE" shape=diamond style=filled]
+	N8 [label="Fused Deposition Modeling" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N9 [label="File Format Conversion" color="#E57373" fillcolor="#FFEBEE" shape=plaintext style=filled]
+	N10 [label="Custom Part Production" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N11 [label="Selective Laser Sintering" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N12 [label=Prototyping color="#E57373" fillcolor="#FFEBEE" shape=Mdiamond style=filled]
+	N13 [label="Sustainable 3D Printing Materials" color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+	N14 [label="Printing Parameter Optimization" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N15 [label="Quality Control" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N16 [label="Consumer Product Creation" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N17 [label="Construction 3D Printing" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	S0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Multi_Material Printing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Maintenance and Repair of Printers" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+		nest0_1 [label=Bioprinting color="#F7BEE0" fillcolor="#FAEBF3" shape=octagon style=filled]
+		nest0_2 [label="Material Research and Development" color="#E57373" fillcolor="#FFEBEE" shape=folder style=filled]
+		nest0_3 [label="Slicing Software Operation" color="#F7BEE0" fillcolor="#FAEBF3" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Troubleshooting Print Errors" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Material Selection" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest1_1 [label="Printing Process" color="#E57373" fillcolor="#FFEBEE" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [label=prototypes color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N6 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [label=controls color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [label=processes color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [label=analyzes color="#E57373" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [label=finishes color="#E57373" dir=forward penwidth=1.5 style=solid]
+	M2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_293.txt b/test/graphviz/scanned_hard/graphviz_293.txt
new file mode 100644
index 0000000000000000000000000000000000000000..58c4bcb89ded3290345fb6d3edbdc464ad3aa467
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_293.txt
@@ -0,0 +1,40 @@
+<Additive Manufacturing, connectedTo, Direct Metal Laser Sintering>
+<Additive Manufacturing, connectedTo, Fused Deposition Modeling>
+<Additive Manufacturing, connectedTo, Post_Processing>
+<Bioprinting, connectedTo, Material Research and Development>
+<Bioprinting, partOf, Bioprinting>
+<Consumer Product Creation, prototypes, Construction 3D Printing>
+<Custom Part Production, connectedTo, Selective Laser Sintering>
+<Digital Twin for 3D Prints, connectedTo, Custom Part Production>
+<Digital Twin for 3D Prints, connectedTo, File Format Conversion>
+<Digital Twin for 3D Prints, connectedTo, Reverse Engineering with 3D Printing>
+<Digital Twin for 3D Prints, controls, Material Selection>
+<Direct Metal Laser Sintering, connectedTo, Fused Deposition Modeling>
+<Distributed Manufacturing, connectedTo, Digital Twin for 3D Prints>
+<Distributed Manufacturing, finishes, Direct Metal Laser Sintering>
+<File Format Conversion, connectedTo, Custom Part Production>
+<Food Printing, connectedTo, Additive Manufacturing>
+<Food Printing, connectedTo, Construction 3D Printing>
+<Fused Deposition Modeling, connectedTo, File Format Conversion>
+<Maintenance and Repair of Printers, connectedTo, Bioprinting>
+<Maintenance and Repair of Printers, partOf, Maintenance and Repair of Printers>
+<Material Research and Development, connectedTo, Slicing Software Operation>
+<Material Research and Development, partOf, Material Research and Development>
+<Material Selection, connectedTo, Printing Process>
+<Material Selection, partOf, Material Selection>
+<Post_Processing, connectedTo, Direct Metal Laser Sintering>
+<Printing Parameter Optimization, connectedTo, Quality Control>
+<Printing Process, connectedTo, Distributed Manufacturing>
+<Printing Process, partOf, Printing Process>
+<Prototyping, connectedTo, Sustainable 3D Printing Materials>
+<Quality Control, connectedTo, Consumer Product Creation>
+<Rapid Manufacturing, connectedTo, Distributed Manufacturing>
+<Rapid Manufacturing, connectedTo, Fused Deposition Modeling>
+<Reverse Engineering with 3D Printing, analyzes, Fused Deposition Modeling>
+<Reverse Engineering with 3D Printing, connectedTo, Food Printing>
+<Reverse Engineering with 3D Printing, connectedTo, Maintenance and Repair of Printers>
+<Reverse Engineering with 3D Printing, processes, Construction 3D Printing>
+<Selective Laser Sintering, connectedTo, Prototyping>
+<Slicing Software Operation, connectedTo, Post_Processing>
+<Slicing Software Operation, partOf, Slicing Software Operation>
+<Sustainable 3D Printing Materials, connectedTo, Printing Parameter Optimization>
diff --git a/test/graphviz/scanned_hard/graphviz_294.txt b/test/graphviz/scanned_hard/graphviz_294.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c6cd9cb9555f2da81f8b89c200e3dd37c5d63695
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_294.txt
@@ -0,0 +1,40 @@
+<Advanced Materials Research, connectedTo, Biosensors>
+<Advanced Materials Research, connectedTo, Nanoelectronics>
+<Advanced Materials Research, connectedTo, Nanoparticle Characterization>
+<Advanced Materials Research, connectedTo, Scanning Electron Microscopy>
+<Carbon Nanotube Synthesis, connectedTo, Nanosensors>
+<Carbon Nanotube Synthesis, partOf, Carbon Nanotube Synthesis>
+<Catalysis at Nanoscale, connectedTo, Spintronics>
+<Catalysis at Nanoscale, partOf, Catalysis at Nanoscale>
+<Energy Storage Applications, connectedTo, Risk Assessment of Nanomaterials>
+<Energy Storage Applications, connectedTo, Spintronics>
+<Energy Storage Applications, connectedTo, Transmission Electron Microscopy>
+<Energy Storage Applications, detects, Regulatory Framework for Nanotech>
+<Environmental Remediation with Nanomaterials, connectedTo, Photovoltaics>
+<Environmental Remediation with Nanomaterials, partOf, Environmental Remediation with Nanomaterials>
+<Ethical Implications of Nanotech, connectedTo, Nanodevice Fabrication>
+<Molecular Self_Assembly, models, Carbon Nanotube Synthesis>
+<Molecular Self_Assembly, partOf, Molecular Self_Assembly>
+<Nanodevice Fabrication, connectedTo, Nanotoxicology>
+<Nanoelectronics, connectedTo, Nanoparticle Characterization>
+<Nanoparticle Characterization, connectedTo, Biosensors>
+<Nanosensors, connectedTo, Catalysis at Nanoscale>
+<Nanosensors, partOf, Nanosensors>
+<Nanotoxicology, connectedTo, Quantum Computing Integration>
+<Nanotoxicology, controls, Transmission Electron Microscopy>
+<Photovoltaics, connectedTo, Quantum Dots>
+<Photovoltaics, partOf, Photovoltaics>
+<Quantum Computing Integration, connectedTo, Energy Storage Applications>
+<Quantum Computing Integration, connectedTo, Environmental Remediation with Nanomaterials>
+<Quantum Dots, connectedTo, Spectroscopy>
+<Quantum Dots, partOf, Quantum Dots>
+<Regulatory Framework for Nanotech, connectedTo, Risk Assessment of Nanomaterials>
+<Risk Assessment of Nanomaterials, connectedTo, Advanced Materials Research>
+<Scanning Electron Microscopy, converts, Nanoelectronics>
+<Spectroscopy, connectedTo, Spintronics>
+<Spectroscopy, partOf, Spectroscopy>
+<Spintronics, connectedTo, Molecular Self_Assembly>
+<Spintronics, connectedTo, Transmission Electron Microscopy>
+<Transmission Electron Microscopy, connectedTo, Regulatory Framework for Nanotech>
+<Water Purification using Nanomaterials, connectedTo, Ethical Implications of Nanotech>
+<Water Purification using Nanomaterials, fabricates, Transmission Electron Microscopy>
diff --git a/test/graphviz/scanned_hard/graphviz_295.dot b/test/graphviz/scanned_hard/graphviz_295.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1ba4992aabbb89a262ab9ac135609cc4fcfaa3d2
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_295.dot
@@ -0,0 +1,58 @@
+digraph {
+	rankdir=TD
+	N0 [label="Quantum Computing Benchmarking" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N1 [label="Quantum Error Correction" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N2 [label="Quantum Annealing" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N3 [label="Quantum Circuit Design" color="#FFB74D" fillcolor="#FFF3E0" shape=Mdiamond style=filled]
+	N4 [label="Optimization Problems with Quantum Annealing" color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N5 [label="Interfacing Classical and Quantum Computers" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N6 [label="Superconducting Qubits" color="#FFE470" fillcolor="#FFFAE0" shape=plaintext style=filled]
+	N7 [label="Quantum Computing Education" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N8 [label="Post_Quantum Cryptography" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N9 [label="Quantum Coherence Management" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S0 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Quantum Computing for AI" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Quantum Programming Languages" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+		nest0_1 [label="Decoherence Mitigation" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Quantum Algorithm Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Quantum Processor Fabrication" color="#6FE1D5" fillcolor="#C9EFEC" shape=folder style=filled]
+		nest1_1 [label="Cryogenic Systems for Qubits" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_2 [label="Quantum Software Development Kit" color="#FFE470" fillcolor="#FFFAE0" shape=oval style=filled]
+		nest1_3 [label="Quantum Communication Protocols" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N4 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [label=configures color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N3 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [label=accesses color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [label=controls color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_295.txt b/test/graphviz/scanned_hard/graphviz_295.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a118ec64936aa6b3fff89d3a8a95a50cdea60714
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_295.txt
@@ -0,0 +1,30 @@
+<Cryogenic Systems for Qubits, connectedTo, Quantum Software Development Kit>
+<Cryogenic Systems for Qubits, partOf, Cryogenic Systems for Qubits>
+<Decoherence Mitigation, connectedTo, Optimization Problems with Quantum Annealing>
+<Decoherence Mitigation, partOf, Decoherence Mitigation>
+<Interfacing Classical and Quantum Computers, accesses, Quantum Coherence Management>
+<Interfacing Classical and Quantum Computers, connectedTo, Post_Quantum Cryptography>
+<Interfacing Classical and Quantum Computers, connectedTo, Quantum Computing Education>
+<Interfacing Classical and Quantum Computers, connectedTo, Superconducting Qubits>
+<Interfacing Classical and Quantum Computers, controls, Post_Quantum Cryptography>
+<Optimization Problems with Quantum Annealing, connectedTo, Interfacing Classical and Quantum Computers>
+<Post_Quantum Cryptography, configures, Quantum Processor Fabrication>
+<Post_Quantum Cryptography, connectedTo, Quantum Coherence Management>
+<Quantum Annealing, connectedTo, Optimization Problems with Quantum Annealing>
+<Quantum Annealing, connectedTo, Quantum Circuit Design>
+<Quantum Circuit Design, connectedTo, Optimization Problems with Quantum Annealing>
+<Quantum Circuit Design, connectedTo, Quantum Programming Languages>
+<Quantum Communication Protocols, connectedTo, Quantum Circuit Design>
+<Quantum Communication Protocols, partOf, Quantum Communication Protocols>
+<Quantum Computing Benchmarking, connectedTo, Optimization Problems with Quantum Annealing>
+<Quantum Computing Benchmarking, connectedTo, Quantum Error Correction>
+<Quantum Computing Education, connectedTo, Post_Quantum Cryptography>
+<Quantum Error Correction, connectedTo, Optimization Problems with Quantum Annealing>
+<Quantum Error Correction, connectedTo, Quantum Annealing>
+<Quantum Processor Fabrication, connectedTo, Cryogenic Systems for Qubits>
+<Quantum Processor Fabrication, partOf, Quantum Processor Fabrication>
+<Quantum Programming Languages, connectedTo, Decoherence Mitigation>
+<Quantum Programming Languages, partOf, Quantum Programming Languages>
+<Quantum Software Development Kit, connectedTo, Quantum Communication Protocols>
+<Quantum Software Development Kit, partOf, Quantum Software Development Kit>
+<Superconducting Qubits, connectedTo, Quantum Computing Education>
diff --git a/test/graphviz/scanned_hard/graphviz_296.txt b/test/graphviz/scanned_hard/graphviz_296.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1a81a62687369a29b4879daa3307902b1dab0674
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_296.txt
@@ -0,0 +1,40 @@
+<3D Model Creation, connectedTo, Comfort and Ergonomics Design>
+<3D Model Creation, connectedTo, Training Simulations>
+<AR for Navigation, connectedTo, Retail Experience Enhancement>
+<AR for Navigation, partOf, AR for Navigation>
+<Architectural Visualization, connectedTo, Live Event Streaming in VR>
+<Architectural Visualization, connectedTo, Training Simulations>
+<Augmented Reality App Development, connectedTo, Virtual Tourism Experiences>
+<Cloud_based AR or VR Rendering, connectedTo, Training Simulations>
+<Comfort and Ergonomics Design, connectedTo, Gesture Recognition>
+<Content Creation for AR or VR, connectedTo, Virtual Reality Game Development>
+<Content Creation for AR or VR, partOf, Content Creation for AR or VR>
+<Environment Mapping, connectedTo, Educational Content Development>
+<Environment Mapping, connectedTo, Software Development Kit Integration>
+<Environment Mapping, connectedTo, Virtual Reality Game Development>
+<Environment Mapping, optimizes, Educational Content Development>
+<Eye Tracking, connectedTo, AR for Navigation>
+<Eye Tracking, partOf, Eye Tracking>
+<Gesture Recognition, connectedTo, Architectural Visualization>
+<Gesture Recognition, connectedTo, Cloud_based AR or VR Rendering>
+<Gesture Recognition, connectedTo, Virtual Tourism Experiences>
+<Hardware Prototyping, projects, Spatial Audio Implementation>
+<Live Event Streaming in VR, connectedTo, Cloud_based AR or VR Rendering>
+<Mixed Reality Solutions, connectedTo, Hardware Prototyping>
+<Performance Optimization, connectedTo, Tracking System Calibration>
+<Performance Optimization, partOf, Performance Optimization>
+<Retail Experience Enhancement, connectedTo, Content Creation for AR or VR>
+<Retail Experience Enhancement, partOf, Retail Experience Enhancement>
+<Software Development Kit Integration, connectedTo, Educational Content Development>
+<Software Development Kit Integration, connectedTo, Performance Optimization>
+<Spatial Audio Implementation, interacts, 3D Model Creation>
+<Tracking System Calibration, connectedTo, Virtual Showrooms>
+<Tracking System Calibration, partOf, Tracking System Calibration>
+<Training Simulations, simulates, Augmented Reality App Development>
+<User Interface Design, connectedTo, Training Simulations>
+<User Interface Design, renders, Mixed Reality Solutions>
+<Virtual Reality Game Development, connectedTo, Software Development Kit Integration>
+<Virtual Showrooms, connectedTo, Software Development Kit Integration>
+<Virtual Showrooms, partOf, Virtual Showrooms>
+<Virtual Tourism Experiences, connectedTo, Environment Mapping>
+<Virtual Tourism Experiences, connectedTo, Eye Tracking>
diff --git a/test/graphviz/scanned_hard/graphviz_297.dot b/test/graphviz/scanned_hard/graphviz_297.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cb1d6931efb46dbec7d6dc69647e07e87afec530
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_297.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=TD
+	N0 [label="PC Game Development" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N1 [label="Player Feedback Integration" color="#DCE775" fillcolor="#FCFCE7" shape=octagon style=filled]
+	N2 [label="Console Game Development" color="#DCE775" fillcolor="#FCFCE7" shape=hexagon style=filled]
+	N3 [label="Physics Simulation" color="#DCE775" fillcolor="#FCFCE7" shape=folder style=filled]
+	N4 [label="Sound Design" color="#DCE775" fillcolor="#FCFCE7" shape=folder style=filled]
+	N5 [label=Localization color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N6 [label="Character Design" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N7 [label="Community Management" color="#DCE775" fillcolor="#FCFCE7" shape=hexagon style=filled]
+	N8 [label="User Interface Design" color="#DCE775" fillcolor="#FCFCE7" shape=plaintext style=filled]
+	N9 [label="In_Game Economy Design" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N10 [label="Quality Assurance Testing" color="#F44336" fillcolor="#FFCDD2" shape=folder style=filled]
+	N11 [label="Game Publishing" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N12 [label="Asset Creation" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N13 [label="Game Design" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N14 [label="Live Operations" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	S0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Mobile Game Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Monetization Strategy" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+		nest0_1 [label="Bug Fixing" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+		nest0_2 [label="Virtual Reality Gaming" color="#F44336" fillcolor="#FFCDD2" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [label=tests color="#DCE775" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Level Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Marketing and Promotion" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest1_1 [label="Narrative Design" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N7 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N13 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N8 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_299.txt b/test/graphviz/scanned_hard/graphviz_299.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a283d7235bd71ca78d2300cc2009cd26497122d9
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_299.txt
@@ -0,0 +1,42 @@
+<Archiving and Preservation, connectedTo, Marketing and Publicity>
+<Archiving and Preservation, partOf, Archiving and Preservation>
+<Art Direction, connectedTo, Audience Research>
+<Art Direction, connectedTo, Crew Management>
+<Audience Research, connectedTo, Crew Management>
+<Costume Design, connectedTo, Tax Incentive Management>
+<Crew Management, connectedTo, Costume Design>
+<Crew Management, connectedTo, Editing>
+<Crew Management, connectedTo, Insurance Management>
+<Crew Management, connectedTo, Virtual Production Techniques>
+<Digital Asset Management, secures, Lighting Design>
+<Distribution Strategy, connectedTo, Costume Design>
+<Distribution Strategy, connectedTo, Stunt Coordination>
+<Editing, connectedTo, Legal Compliance>
+<Film Festival Submission, connectedTo, Prop Management>
+<Film Festival Submission, partOf, Film Festival Submission>
+<Film Scoring, connectedTo, Audience Research>
+<Film Scoring, connectedTo, Prop Management>
+<Film Scoring, records, Crew Management>
+<Green Production Practices, connectedTo, Art Direction>
+<Green Production Practices, connectedTo, Audience Research>
+<Insurance Management, mixes, Distribution Strategy>
+<Legal Compliance, connectedTo, Special Effects>
+<Lighting Design, connectedTo, Directing>
+<Marketing and Publicity, connectedTo, Distribution Strategy>
+<Marketing and Publicity, partOf, Marketing and Publicity>
+<Production Accounting, connectedTo, Film Festival Submission>
+<Production Accounting, partOf, Production Accounting>
+<Prop Management, connectedTo, Audience Research>
+<Prop Management, connectedTo, Costume Design>
+<Prop Management, connectedTo, Crew Management>
+<Prop Management, connectedTo, Digital Asset Management>
+<Prop Management, connectedTo, Green Production Practices>
+<Prop Management, connectedTo, Special Effects>
+<Prop Management, produces, Legal Compliance>
+<Screenwriting Workshops, connectedTo, Insurance Management>
+<Special Effects, connectedTo, Screenwriting Workshops>
+<Stunt Coordination, connectedTo, Archiving and Preservation>
+<Stunt Coordination, partOf, Stunt Coordination>
+<Tax Incentive Management, connectedTo, Digital Asset Management>
+<Virtual Production Techniques, connectedTo, Production Accounting>
+<Virtual Production Techniques, partOf, Virtual Production Techniques>
diff --git a/test/graphviz/scanned_hard/graphviz_3.dot b/test/graphviz/scanned_hard/graphviz_3.dot
new file mode 100644
index 0000000000000000000000000000000000000000..384011a17f90214bd2f638c8860ca3bea2b71f69
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_3.dot
@@ -0,0 +1,25 @@
+digraph {
+	rankdir=TD
+	N0 [label="Work_in_Progress Monitoring" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N1 [label=Storage color="#DCE775" fillcolor="#FCFCE7" shape=hexagon style=filled]
+	N2 [label="Predictive Maintenance" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N3 [label="Logistics Planning" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N4 [label="Automated Guided Vehicle Operation" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N5 [label=Assembly color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N6 [label=Shipping color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N7 [label="Factory Layout Planning" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N8 [label="Inventory Check" color="#DCE775" fillcolor="#FCFCE7" shape=plaintext style=filled]
+	N9 [label="Recycling Process" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N10 [label="Product Design" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N0 -> N1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=orders color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=automates color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=calibrates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=processes color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=repairs color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N8 -> N10 [label=cleans color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_3.txt b/test/graphviz/scanned_hard/graphviz_3.txt
new file mode 100644
index 0000000000000000000000000000000000000000..19cf03cd15a4a13be9ef119ad13c6b2da504ae66
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_3.txt
@@ -0,0 +1,11 @@
+<Assembly, automates, Shipping>
+<Automated Guided Vehicle Operation, orders, Assembly>
+<Factory Layout Planning, connectedTo, Inventory Check>
+<Inventory Check, cleans, Product Design>
+<Inventory Check, processes, Recycling Process>
+<Logistics Planning, connectedTo, Automated Guided Vehicle Operation>
+<Predictive Maintenance, connectedTo, Logistics Planning>
+<Recycling Process, repairs, Product Design>
+<Shipping, calibrates, Factory Layout Planning>
+<Storage, connectedTo, Predictive Maintenance>
+<Work_in_Progress Monitoring, connectedTo, Storage>
diff --git a/test/graphviz/scanned_hard/graphviz_30.dot b/test/graphviz/scanned_hard/graphviz_30.dot
new file mode 100644
index 0000000000000000000000000000000000000000..61f2d9c7a7ecd4c1b55afd84a392cd8b0adf7cb9
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_30.dot
@@ -0,0 +1,25 @@
+digraph {
+	rankdir=TD
+	N0 [label="Allergen Management" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label=Brewing color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N2 [label="Beverage Production" color="#FF5722" fillcolor="#FFCCBC" shape=folder style=filled]
+	N3 [label="Regulatory Compliance" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N4 [label="Food Packaging Design" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N5 [label="Food Safety Inspection" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N6 [label="Nutrition Analysis" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N7 [label="Product Shelf_Life Testing" color="#FF5722" fillcolor="#FFCCBC" shape=octagon style=filled]
+	N8 [label="Sensory Evaluation" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+	N9 [label="Waste Reduction" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N10 [label="Menu Planning" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N0 -> N1 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=tests color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=nutrifies color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=develops color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=traces color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N6 -> N2 [label=markets color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_30.txt b/test/graphviz/scanned_hard/graphviz_30.txt
new file mode 100644
index 0000000000000000000000000000000000000000..04accc9d5d1898da28845ef70c49f3dd95422519
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_30.txt
@@ -0,0 +1,11 @@
+<Allergen Management, connectedTo, Brewing>
+<Beverage Production, tests, Regulatory Compliance>
+<Brewing, connectedTo, Beverage Production>
+<Food Packaging Design, connectedTo, Food Safety Inspection>
+<Food Safety Inspection, connectedTo, Nutrition Analysis>
+<Nutrition Analysis, markets, Beverage Production>
+<Nutrition Analysis, nutrifies, Product Shelf_Life Testing>
+<Product Shelf_Life Testing, connectedTo, Sensory Evaluation>
+<Regulatory Compliance, connectedTo, Food Packaging Design>
+<Sensory Evaluation, develops, Waste Reduction>
+<Waste Reduction, traces, Menu Planning>
diff --git a/test/graphviz/scanned_hard/graphviz_300.dot b/test/graphviz/scanned_hard/graphviz_300.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b73dd837b067ac3ef8091d6e96d6bf201092e6ec
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_300.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=BT
+	N0 [label="Transcribing Audio or Video" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N1 [label="Voice Acting or Narration" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N2 [label="Content Repurposing" color="#6FE1D5" fillcolor="#C9EFEC" shape=parallelogram style=filled]
+	N3 [label="Keyword Research" color="#B0C5CD" fillcolor="#DFE7EB" shape=folder style=filled]
+	N4 [label="Video Scripting" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N5 [label="Audience Engagement" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N6 [label="User_Generated Content Curation" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N7 [label="Content Management System Operation" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+	N8 [label="Newsletter Creation" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N9 [label="Distribution Planning" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N10 [label="Interview Conduct" color="#6FE1D5" fillcolor="#C9EFEC" shape=octagon style=filled]
+	N11 [label=Fact_Checking color="#B0C5CD" fillcolor="#DFE7EB" shape=folder style=filled]
+	N12 [label="Audience Analysis" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	S0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Plagiarism Checking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Interactive Content Development" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_1 [label="Content Localization" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Search Engine Optimization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Webinar Hosting" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest1_1 [label="Influencer Collaboration" color="#C0CA33" fillcolor="#F9FBE7" shape=plaintext style=filled]
+		nest1_2 [label="Content Strategy Development" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=engages color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N4 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N10 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_301.dot b/test/graphviz/scanned_hard/graphviz_301.dot
new file mode 100644
index 0000000000000000000000000000000000000000..312aa192495378708bce8c605dbc2e21ccc23634
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_301.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=BT
+	N0 [label="Customer Analytics" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N1 [label="Social Media Analytics" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N2 [label="Data Warehouse Design" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N3 [label="Sentiment Analysis" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N4 [label="A or B Testing Analysis" color="#FFA726" fillcolor="#FFF3E0" shape=oval style=filled]
+	N5 [label="ETL Process Management" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N6 [label="Natural Language Processing for Data" color="#FFB74D" fillcolor="#FFF3E0" shape=parallelogram style=filled]
+	N7 [label="Report Generation" color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N8 [label="Machine Learning Integration" color="#FFA726" fillcolor="#FFF3E0" shape=folder style=filled]
+	N9 [label="Data Governance" color="#FFA726" fillcolor="#FFF3E0" shape=octagon style=filled]
+	N10 [label="Dashboard Creation" color="#4DD0E1" fillcolor="#C9F0F0" shape=oval style=filled]
+	N11 [label="Healthcare Data Analysis" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N12 [label="Text Analytics" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N13 [label="Data Storytelling" color="#FFB74D" fillcolor="#FFF3E0" shape=oval style=filled]
+	N14 [label="Marketing Campaign Analysis" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S0 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Exploratory Data Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Predictive Analytics" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_1 [label="HR Data Analytics" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Data Cleaning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Data Pipeline Development" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+		nest1_1 [label="Cloud_based Data Platforms" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest1_2 [label="Statistical Modeling" color="#4DD0E1" fillcolor="#C9F0F0" shape=folder style=filled]
+		nest1_3 [label="Supply Chain Analytics" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=reports color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=segments color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=shares color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N9 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N1 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [label=architects color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N13 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_301.txt b/test/graphviz/scanned_hard/graphviz_301.txt
new file mode 100644
index 0000000000000000000000000000000000000000..510b0972241c5fc2a0a67619adc583d1fe374932
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_301.txt
@@ -0,0 +1,38 @@
+<A or B Testing Analysis, connectedTo, ETL Process Management>
+<Cloud_based Data Platforms, connectedTo, Statistical Modeling>
+<Cloud_based Data Platforms, partOf, Cloud_based Data Platforms>
+<Customer Analytics, connectedTo, Natural Language Processing for Data>
+<Customer Analytics, connectedTo, Social Media Analytics>
+<Dashboard Creation, shares, Healthcare Data Analysis>
+<Data Governance, segments, Dashboard Creation>
+<Data Pipeline Development, connectedTo, Cloud_based Data Platforms>
+<Data Pipeline Development, partOf, Data Pipeline Development>
+<Data Storytelling, connectedTo, Marketing Campaign Analysis>
+<Data Warehouse Design, connectedTo, Natural Language Processing for Data>
+<Data Warehouse Design, connectedTo, Sentiment Analysis>
+<ETL Process Management, connectedTo, Data Storytelling>
+<ETL Process Management, connectedTo, Natural Language Processing for Data>
+<HR Data Analytics, connectedTo, Data Governance>
+<HR Data Analytics, partOf, HR Data Analytics>
+<Healthcare Data Analysis, connectedTo, Text Analytics>
+<Machine Learning Integration, architects, Data Storytelling>
+<Machine Learning Integration, connectedTo, Data Governance>
+<Machine Learning Integration, connectedTo, Data Pipeline Development>
+<Natural Language Processing for Data, connectedTo, Dashboard Creation>
+<Natural Language Processing for Data, connectedTo, Healthcare Data Analysis>
+<Natural Language Processing for Data, connectedTo, Report Generation>
+<Predictive Analytics, connectedTo, HR Data Analytics>
+<Predictive Analytics, partOf, Predictive Analytics>
+<Report Generation, connectedTo, Predictive Analytics>
+<Report Generation, reports, Machine Learning Integration>
+<Sentiment Analysis, connectedTo, A or B Testing Analysis>
+<Sentiment Analysis, connectedTo, Data Governance>
+<Sentiment Analysis, connectedTo, Healthcare Data Analysis>
+<Sentiment Analysis, connectedTo, Machine Learning Integration>
+<Sentiment Analysis, connectedTo, Natural Language Processing for Data>
+<Social Media Analytics, connectedTo, Data Warehouse Design>
+<Statistical Modeling, connectedTo, Supply Chain Analytics>
+<Statistical Modeling, partOf, Statistical Modeling>
+<Supply Chain Analytics, connectedTo, Social Media Analytics>
+<Supply Chain Analytics, partOf, Supply Chain Analytics>
+<Text Analytics, connectedTo, Data Storytelling>
diff --git a/test/graphviz/scanned_hard/graphviz_302.txt b/test/graphviz/scanned_hard/graphviz_302.txt
new file mode 100644
index 0000000000000000000000000000000000000000..24385e9ff5835169ee1f1f3ddc06ba395a97fe29
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_302.txt
@@ -0,0 +1,41 @@
+<Cloud BI Solutions, connectedTo, Risk Assessment Reporting>
+<Competitive Analysis, connectedTo, Sales Forecasting>
+<Competitive Analysis, connectedTo, Supply Chain Optimization>
+<Customer Behavior Insights, connectedTo, Competitive Analysis>
+<Customer Behavior Insights, connectedTo, Market Trend Analysis>
+<Customer Behavior Insights, connectedTo, Mobile BI Development>
+<Customer Behavior Insights, connectedTo, Query Optimization>
+<Customer Behavior Insights, connectedTo, Self_Service BI Tools>
+<Data Governance Policies, connectedTo, Data Modeling>
+<Data Governance Policies, connectedTo, Query Optimization>
+<Data Governance Policies, connectedTo, Supply Chain Optimization>
+<Data Governance Policies, monitors, Embedded Analytics>
+<Data Modeling, connectedTo, Operational Efficiency Measurement>
+<Data Modeling, partOf, Data Modeling>
+<Data Source Integration, connectedTo, Customer Behavior Insights>
+<Data Source Integration, connectedTo, Data Storytelling for Business>
+<Data Storytelling for Business, connectedTo, Business Process Improvement>
+<Data Storytelling for Business, connectedTo, Customer Behavior Insights>
+<Data Storytelling for Business, connectedTo, Performance Monitoring>
+<Data Storytelling for Business, supports, Market Trend Analysis>
+<Data Warehousing, connectedTo, Data Storytelling for Business>
+<Data Warehousing, connectedTo, Report Automation>
+<Data Warehousing, connectedTo, Supply Chain Optimization>
+<Embedded Analytics, connectedTo, Market Trend Analysis>
+<Market Trend Analysis, connectedTo, Business Process Improvement>
+<Mobile BI Development, connectedTo, Cloud BI Solutions>
+<Operational Efficiency Measurement, connectedTo, Sales Forecasting>
+<Operational Efficiency Measurement, partOf, Operational Efficiency Measurement>
+<Performance Monitoring, connectedTo, Customer Behavior Insights>
+<Prescriptive Analytics Implementation, connectedTo, Strategic Planning Support>
+<Prescriptive Analytics Implementation, partOf, Prescriptive Analytics Implementation>
+<Query Optimization, connectedTo, Embedded Analytics>
+<Report Automation, connectedTo, Data Source Integration>
+<Report Automation, connectedTo, Data Storytelling for Business>
+<Risk Assessment Reporting, connectedTo, Query Optimization>
+<Sales Forecasting, secures, Data Governance Policies>
+<Self_Service BI Tools, connectedTo, Prescriptive Analytics Implementation>
+<Self_Service BI Tools, partOf, Self_Service BI Tools>
+<Strategic Planning Support, connectedTo, Business Process Improvement>
+<Strategic Planning Support, partOf, Strategic Planning Support>
+<Supply Chain Optimization, connectedTo, Mobile BI Development>
diff --git a/test/graphviz/scanned_hard/graphviz_303.txt b/test/graphviz/scanned_hard/graphviz_303.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1d3b9581aaff8f0a51a2405ca2865e7afb2b3f49
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_303.txt
@@ -0,0 +1,40 @@
+<Campaign Performance Tracking, connectedTo, Video Marketing>
+<Customer Journey Mapping, connectedTo, Event Marketing>
+<Customer Relationship Management, connectedTo, Direct Mail Marketing>
+<Customer Relationship Management, connectedTo, Influencer Marketing>
+<Customer Segmentation, connectedTo, Personalization Strategies>
+<Customer Segmentation, partOf, Customer Segmentation>
+<Direct Mail Marketing, connectedTo, Guerilla Marketing>
+<Distribution Channel Management, connectedTo, Customer Relationship Management>
+<Distribution Channel Management, partOf, Distribution Channel Management>
+<Email Marketing, connectedTo, Mobile Marketing>
+<Event Marketing, connectedTo, Customer Relationship Management>
+<Event Marketing, connectedTo, Guerilla Marketing>
+<Event Marketing, connectedTo, Website Design and Optimization>
+<Experiential Marketing, connectedTo, Search Engine Optimization>
+<Guerilla Marketing, connectedTo, Telemarketing>
+<Influencer Marketing, connectedTo, Market Research>
+<Influencer Marketing, connectedTo, Pricing Strategy>
+<Influencer Marketing, connectedTo, Public Relations>
+<Influencer Marketing, connectedTo, Target Audience Identification>
+<Lead Generation, connectedTo, Customer Journey Mapping>
+<Mobile Marketing, connectedTo, Lead Generation>
+<Mobile Marketing, connectedTo, Remarketing Campaigns>
+<Mobile Marketing, generates leads, Influencer Marketing>
+<Partnership Marketing, connectedTo, Search Engine Marketing>
+<Partnership Marketing, partOf, Partnership Marketing>
+<Personalization Strategies, partOf, Personalization Strategies>
+<Personalization Strategies, runs SEM, Distribution Channel Management>
+<Pricing Strategy, guerilla marketing, Public Relations>
+<Public Relations, connectedTo, Target Audience Identification>
+<Remarketing Campaigns, connectedTo, Partnership Marketing>
+<Remarketing Campaigns, partOf, Remarketing Campaigns>
+<Search Engine Marketing, connectedTo, Market Research>
+<Search Engine Marketing, partOf, Search Engine Marketing>
+<Search Engine Optimization, connectedTo, Customer Segmentation>
+<Search Engine Optimization, connectedTo, Influencer Marketing>
+<Target Audience Identification, connectedTo, Market Research>
+<Telemarketing, connectedTo, Influencer Marketing>
+<Telemarketing, connectedTo, Website Design and Optimization>
+<Video Marketing, connectedTo, Email Marketing>
+<Website Design and Optimization, connectedTo, Experiential Marketing>
diff --git a/test/graphviz/scanned_hard/graphviz_305.txt b/test/graphviz/scanned_hard/graphviz_305.txt
new file mode 100644
index 0000000000000000000000000000000000000000..01a07fcf2dd8c90f6df0131d0fbc176b4ac7c6f5
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_305.txt
@@ -0,0 +1,42 @@
+<Consensus Mechanism Development, connectedTo, Cryptographic Hashing>
+<Consensus Mechanism Development, connectedTo, Gaming on Blockchain>
+<Consensus Mechanism Development, connectedTo, Interoperability Solutions>
+<Consensus Mechanism Development, connectedTo, Sharding Implementation>
+<Consensus Mechanism Development, connectedTo, Zero_Knowledge Proofs>
+<Cross_Chain Bridges, connectedTo, Initial Coin Offerings>
+<Cross_Chain Bridges, powers games, Decentralized Applications Development>
+<Cryptographic Hashing, connectedTo, Zero_Knowledge Proofs>
+<Decentralized Applications Development, connectedTo, Gaming on Blockchain>
+<Decentralized Finance Protocols, connectedTo, Cross_Chain Bridges>
+<Decentralized Network Design, builds NFTs, Interoperability Solutions>
+<Decentralized Network Design, connectedTo, Consensus Mechanism Development>
+<Distributed Ledger Technology, connectedTo, Tokenomics Design>
+<Distributed Ledger Technology, partOf, Distributed Ledger Technology>
+<Energy Trading on Blockchain, connectedTo, Interoperability Solutions>
+<Enterprise Blockchain Solutions, connectedTo, Security Auditing for Blockchains>
+<Enterprise Blockchain Solutions, partOf, Enterprise Blockchain Solutions>
+<Gaming on Blockchain, connectedTo, Enterprise Blockchain Solutions>
+<Gaming on Blockchain, connectedTo, Identity Verification on Blockchain>
+<Healthcare Data Management, connectedTo, Public Blockchain Deployment>
+<Healthcare Data Management, processes payments, Interoperability Solutions>
+<Initial Coin Offerings, connectedTo, Real Estate Tokenization>
+<Interoperability Solutions, connectedTo, Decentralized Applications Development>
+<Interoperability Solutions, connectedTo, Gaming on Blockchain>
+<Interoperability Solutions, connectedTo, Mining Operations>
+<Interoperability Solutions, connectedTo, Sharding Implementation>
+<Mining Operations, connectedTo, Decentralized Applications Development>
+<Mining Operations, connectedTo, Gaming on Blockchain>
+<Mining Operations, connectedTo, Identity Verification on Blockchain>
+<Public Blockchain Deployment, connectedTo, Decentralized Finance Protocols>
+<Real Estate Tokenization, connectedTo, Energy Trading on Blockchain>
+<Real Estate Tokenization, identifies users, Decentralized Applications Development>
+<Security Auditing for Blockchains, connectedTo, Sharding Implementation>
+<Security Auditing for Blockchains, partOf, Security Auditing for Blockchains>
+<Sharding Implementation, connectedTo, Distributed Ledger Technology>
+<Sharding Implementation, connectedTo, Smart Contract Development>
+<Smart Contract Development, connectedTo, Decentralized Applications Development>
+<Smart Contract Development, connectedTo, Mining Operations>
+<Tokenomics Design, connectedTo, Identity Verification on Blockchain>
+<Tokenomics Design, partOf, Tokenomics Design>
+<Zero_Knowledge Proofs, connectedTo, Healthcare Data Management>
+<Zero_Knowledge Proofs, connectedTo, Interoperability Solutions>
diff --git a/test/graphviz/scanned_hard/graphviz_306.dot b/test/graphviz/scanned_hard/graphviz_306.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8afa6390b4b5409b8ed296e880f2821976e4dd3d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_306.dot
@@ -0,0 +1,51 @@
+digraph {
+	rankdir=RL
+	N0 [label="Custodial Services" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Fiat On or Off Ramps" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N2 [label="Token Generation Event" color="#FFC085" fillcolor="#FFDAB9" shape=octagon style=filled]
+	N3 [label="Web3 Integration" color="#FFC085" fillcolor="#FFDAB9" shape=parallelogram style=filled]
+	N4 [label="Cross_chain Swaps" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N5 [label="Smart Contract Auditing" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N6 [label="Exchange Listing" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+	N7 [label="Venture Capital Funding" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S2 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Decentralized Autonomous Organizations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Transaction Processing" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_1 [label="Cryptocurrency Education" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+		nest0_2 [label="Decentralized Exchange Operation" color="#FFC085" fillcolor="#FFDAB9" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Airdrop Campaigns" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Blockchain Integration" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+		nest1_1 [label="Stablecoin Design" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+		nest1_2 [label="Mining Algorithm Design" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N3 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N3 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_1 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N5 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_307.dot b/test/graphviz/scanned_hard/graphviz_307.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e6b7131f2afe1cb7016880ee06ca17a306aafd38
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_307.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=BT
+	N0 [label="Marketing Strategy" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N1 [label="Equity Crowdfunding" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N2 [label="International Crowdfunding" color="#D3EB9F" fillcolor="#F8FDD3" shape=octagon style=filled]
+	N3 [label="Pitch Deck Preparation" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N4 [label="Escrow Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=folder style=filled]
+	N5 [label="Platform Fee Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=plaintext style=filled]
+	N6 [label="Post_Campaign Updates" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N7 [label="Tax Implications of Crowdfunding" color="#A2D0FF" fillcolor="#E8F0FF" shape=octagon style=filled]
+	N8 [label="Investor Relations" color="#A2D0FF" fillcolor="#E8F0FF" shape=diamond style=filled]
+	N9 [label="Debt Crowdfunding" color="#A2D0FF" fillcolor="#E8F0FF" shape=folder style=filled]
+	N10 [label="Reward Tier Design" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	S0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Post_Campaign Reporting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Fulfillment Planning" color="#A2D0FF" fillcolor="#E8F0FF" shape=oval style=filled]
+		nest0_1 [label="Legal Compliance" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+		nest0_2 [label="Funding Period Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=plaintext style=filled]
+		nest0_3 [label="Customer Support for Backers" color="#D3EB9F" fillcolor="#F8FDD3" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Real Estate Crowdfunding" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Social Media Promotion" color="#D3EB9F" fillcolor="#F8FDD3" shape=folder style=filled]
+		nest1_1 [label="Reward_Based Crowdfunding" color="#D3EB9F" fillcolor="#F8FDD3" shape=plaintext style=filled]
+		nest1_2 [label="Manufacturing Planning" color="#4DD0E1" fillcolor="#C9F0F0" shape=Mdiamond style=filled]
+		nest1_3 [label="Financial Projection Analysis" color="#4DD0E1" fillcolor="#C9F0F0" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label="selects platforms" color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [label="analyzes data" color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_308.txt b/test/graphviz/scanned_hard/graphviz_308.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3307940767a717d53b48c3b03d6c3554a50fad9f
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_308.txt
@@ -0,0 +1,40 @@
+<AI at the Edge, connectedTo, Smart City Sensors>
+<AI at the Edge, partOf, AI at the Edge>
+<API Development for IoT, connectedTo, Interoperability Standards>
+<Asset Tracking, connectedTo, Cloud Platform Integration>
+<Asset Tracking, connectedTo, Device Prototyping>
+<Cloud Platform Integration, connectedTo, Smart Home Devices>
+<Compliance with IoT Regulations, connectedTo, Wearable Technology>
+<Connected Vehicles, connectedTo, Compliance with IoT Regulations>
+<Connected Vehicles, connectedTo, Device Prototyping>
+<Connected Vehicles, streams data, Transportation IoT>
+<Data Analysis in Cloud, connectedTo, Data Processing at Edge>
+<Data Privacy in IoT, connectedTo, Industrial IoT>
+<Data Privacy in IoT, partOf, Data Privacy in IoT>
+<Data Processing at Edge, connectedTo, API Development for IoT>
+<Data Processing at Edge, connectedTo, Smart Manufacturing>
+<Device Prototyping, connectedTo, Over_the_Air Updates>
+<Gateway Development, connectedTo, Data Analysis in Cloud>
+<Industrial IoT, connectedTo, IoT Device Certification>
+<Interoperability Standards, connectedTo, AI at the Edge>
+<Interoperability Standards, connectedTo, Supply Chain Optimization>
+<Interoperability Standards, connectedTo, Transportation IoT>
+<IoT Device Certification, connectedTo, Sensor Integration>
+<Over_the_Air Updates, configures APIs, IoT Device Certification>
+<Over_the_Air Updates, connectedTo, Gateway Development>
+<Over_the_Air Updates, connectedTo, Industrial IoT>
+<Over_the_Air Updates, connectedTo, Supply Chain Optimization>
+<Over_the_Air Updates, connectedTo, Transportation IoT>
+<Power Management for Devices, connectedTo, Device Prototyping>
+<Real_time Data Streaming, connectedTo, Power Management for Devices>
+<Security Implementation, connectedTo, Smart Manufacturing>
+<Security Implementation, partOf, Security Implementation>
+<Smart City Sensors, connectedTo, Data Privacy in IoT>
+<Smart City Sensors, partOf, Smart City Sensors>
+<Smart Home Devices, connectedTo, Real_time Data Streaming>
+<Smart Manufacturing, connectedTo, Over_the_Air Updates>
+<Smart Manufacturing, partOf, Smart Manufacturing>
+<Supply Chain Optimization, connectedTo, Security Implementation>
+<Supply Chain Optimization, connectedTo, Transportation IoT>
+<Transportation IoT, connectedTo, Industrial IoT>
+<Wearable Technology, connectedTo, Asset Tracking>
diff --git a/test/graphviz/scanned_hard/graphviz_309.dot b/test/graphviz/scanned_hard/graphviz_309.dot
new file mode 100644
index 0000000000000000000000000000000000000000..34465543205ae588ff580aef61cde59a1279adbe
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_309.dot
@@ -0,0 +1,58 @@
+digraph {
+	rankdir=BT
+	N0 [label="Industrial Edge Computing" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N1 [label="Power Consumption Optimization" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N2 [label="Data Synchronization between Edge and Cloud" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N3 [label="Microservices on Edge Devices" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N4 [label="Smart City Edge Solutions" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N5 [label="Local AI or ML Inference" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N6 [label="Retail Edge Computing" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N7 [label="Virtualization at Edge" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N8 [label="Edge Device Provisioning" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N9 [label="Offline Functionality" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	S0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Data Filtering at Edge" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Telecom Edge Computing" color="#7E57C2" fillcolor="#EDE7F6" shape=diamond style=filled]
+		nest0_1 [label="Fleet Management for Edge Devices" color="#7E57C2" fillcolor="#EDE7F6" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Event_Driven Architectures at Edge" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Latency Reduction" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_1 [label="Edge Computing Hardware Selection" color="#FFEB3B" fillcolor="#FFF9C4" shape=plaintext style=filled]
+		nest1_2 [label="Orchestration of Edge Workloads" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_3 [label="Edge Device Deployment" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label="enhances privacy" color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N9 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest1_0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_309.txt b/test/graphviz/scanned_hard/graphviz_309.txt
new file mode 100644
index 0000000000000000000000000000000000000000..08e7723b93646b3bc260f3d729e667bd19b852d1
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_309.txt
@@ -0,0 +1,31 @@
+<Data Synchronization between Edge and Cloud, connectedTo, Edge Device Provisioning>
+<Data Synchronization between Edge and Cloud, connectedTo, Microservices on Edge Devices>
+<Data Synchronization between Edge and Cloud, connectedTo, Retail Edge Computing>
+<Data Synchronization between Edge and Cloud, connectedTo, Smart City Edge Solutions>
+<Data Synchronization between Edge and Cloud, connectedTo, Virtualization at Edge>
+<Edge Computing Hardware Selection, connectedTo, Orchestration of Edge Workloads>
+<Edge Computing Hardware Selection, partOf, Edge Computing Hardware Selection>
+<Edge Device Deployment, connectedTo, Retail Edge Computing>
+<Edge Device Deployment, partOf, Edge Device Deployment>
+<Edge Device Provisioning, enhances privacy, Offline Functionality>
+<Fleet Management for Edge Devices, connectedTo, Offline Functionality>
+<Fleet Management for Edge Devices, partOf, Fleet Management for Edge Devices>
+<Industrial Edge Computing, connectedTo, Power Consumption Optimization>
+<Industrial Edge Computing, connectedTo, Smart City Edge Solutions>
+<Latency Reduction, connectedTo, Edge Computing Hardware Selection>
+<Latency Reduction, partOf, Latency Reduction>
+<Local AI or ML Inference, connectedTo, Retail Edge Computing>
+<Microservices on Edge Devices, connectedTo, Smart City Edge Solutions>
+<Orchestration of Edge Workloads, connectedTo, Edge Device Deployment>
+<Orchestration of Edge Workloads, partOf, Orchestration of Edge Workloads>
+<Power Consumption Optimization, connectedTo, Data Synchronization between Edge and Cloud>
+<Power Consumption Optimization, connectedTo, Latency Reduction>
+<Power Consumption Optimization, connectedTo, Smart City Edge Solutions>
+<Retail Edge Computing, connectedTo, Telecom Edge Computing>
+<Retail Edge Computing, connectedTo, Virtualization at Edge>
+<Smart City Edge Solutions, connectedTo, Edge Device Provisioning>
+<Smart City Edge Solutions, connectedTo, Local AI or ML Inference>
+<Smart City Edge Solutions, connectedTo, Offline Functionality>
+<Telecom Edge Computing, connectedTo, Fleet Management for Edge Devices>
+<Telecom Edge Computing, partOf, Telecom Edge Computing>
+<Virtualization at Edge, connectedTo, Edge Device Provisioning>
diff --git a/test/graphviz/scanned_hard/graphviz_31.txt b/test/graphviz/scanned_hard/graphviz_31.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c376e7b8e0196ad6f540588f40dacfb233337fb9
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_31.txt
@@ -0,0 +1,9 @@
+<Community Sports Programs, educates, Stadium Operations>
+<Fan Engagement, recruits, Fan Experience Enhancement>
+<Fan Experience Enhancement, optimizes, Fitness Conditioning>
+<Fitness Conditioning, connectedTo, Tournament Organization>
+<Sports Marketing, rehabilitates, Sports Technology Integration>
+<Sports Medicine, connectedTo, Fan Engagement>
+<Sports Medicine, connectedTo, Fan Experience Enhancement>
+<Sports Technology Integration, tests, Sports Medicine>
+<Tournament Organization, licenses, Community Sports Programs>
diff --git a/test/graphviz/scanned_hard/graphviz_310.dot b/test/graphviz/scanned_hard/graphviz_310.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2a161a4ed756ffc06de077c3559c4a185b28d343
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_310.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=TD
+	N0 [label="Machine Learning as a Service" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N1 [label="Cloud FinOps" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N2 [label="Multi_Cloud Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+	N3 [label="Edge_to_Cloud Integration" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N4 [label="Big Data Services in Cloud" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N5 [label="Auto_Scaling Configurations" color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+	N6 [label="Container Orchestration" color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+	N7 [label="Database as a Service" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N8 [label="Private Cloud Management" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N9 [label="Serverless Computing" color="#A188D0" fillcolor="#DACBE3" shape=parallelogram style=filled]
+	N10 [label="Virtual Machine Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	S0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Cloud Automation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Identity and Access Management" color="#61CAC3" fillcolor="#C2E8E6" shape=diamond style=filled]
+		nest0_1 [label="Network Configuration in Cloud" color="#A188D0" fillcolor="#DACBE3" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Cloud Marketplace Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Cloud Security" color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+		nest1_1 [label="Cost Optimization in Cloud" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+		nest1_2 [label="Cloud Native Application Development" color="#CD8FF2" fillcolor="#ECCFF5" shape=folder style=filled]
+		nest1_3 [label="Cloud Firewall Configuration" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [label="offers MLaaS" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label="configures networks" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label="delivers SaaS" color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label="architects solutions" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N10 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest1_0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N7 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_311.dot b/test/graphviz/scanned_hard/graphviz_311.dot
new file mode 100644
index 0000000000000000000000000000000000000000..644b2f111045f36be6191291fe2fd068ba6fb92f
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_311.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=LR
+	N0 [label="DNS Management" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N1 [label="Virtual Desktop Infrastructure" color="#AF56A6" fillcolor="#DDCEDD" shape=octagon style=filled]
+	N2 [label="User Account Management" color="#AF56A6" fillcolor="#DDCEDD" shape=Mdiamond style=filled]
+	N3 [label="Environmental Monitoring" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N4 [label="Capacity Planning" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N5 [label="Mail Server Management" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N6 [label="Hardware Maintenance" color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+	N7 [label="System Administration" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+	N8 [label="Web Server Configuration" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N9 [label="Antivirus and Endpoint Protection" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N10 [label="Directory Services" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	S0 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Hardware Procurement" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cabling and Wiring" color="#A188D0" fillcolor="#DACBE3" shape=parallelogram style=filled]
+		nest0_1 [label="Cloud Integration with On_premise" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+		nest0_2 [label="Network Design" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest0_3 [label="Group Policy Management" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Access Control Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="VPN Configuration" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+		nest1_1 [label="Proxy Server Configuration" color="#AF56A6" fillcolor="#DDCEDD" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label="configures firewalls" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N8 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N5 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S2 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_311.txt b/test/graphviz/scanned_hard/graphviz_311.txt
new file mode 100644
index 0000000000000000000000000000000000000000..edf83819a6ea935abcab28ed4499cffae5203edf
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_311.txt
@@ -0,0 +1,33 @@
+<Antivirus and Endpoint Protection, connectedTo, Directory Services>
+<Cabling and Wiring, connectedTo, Cloud Integration with On_premise>
+<Cabling and Wiring, partOf, Cabling and Wiring>
+<Capacity Planning, configures firewalls, Mail Server Management>
+<Capacity Planning, connectedTo, Directory Services>
+<Capacity Planning, connectedTo, System Administration>
+<Capacity Planning, connectedTo, VPN Configuration>
+<Capacity Planning, connectedTo, Web Server Configuration>
+<Cloud Integration with On_premise, connectedTo, Network Design>
+<Cloud Integration with On_premise, partOf, Cloud Integration with On_premise>
+<DNS Management, connectedTo, Virtual Desktop Infrastructure>
+<Environmental Monitoring, connectedTo, Capacity Planning>
+<Environmental Monitoring, connectedTo, Directory Services>
+<Environmental Monitoring, connectedTo, Web Server Configuration>
+<Group Policy Management, connectedTo, Web Server Configuration>
+<Group Policy Management, partOf, Group Policy Management>
+<Hardware Maintenance, connectedTo, Antivirus and Endpoint Protection>
+<Hardware Maintenance, connectedTo, Directory Services>
+<Hardware Maintenance, connectedTo, System Administration>
+<Hardware Maintenance, connectedTo, Web Server Configuration>
+<Mail Server Management, connectedTo, Hardware Maintenance>
+<Network Design, connectedTo, Group Policy Management>
+<Network Design, partOf, Network Design>
+<Proxy Server Configuration, connectedTo, Mail Server Management>
+<Proxy Server Configuration, partOf, Proxy Server Configuration>
+<System Administration, connectedTo, Web Server Configuration>
+<User Account Management, connectedTo, Cabling and Wiring>
+<User Account Management, connectedTo, Environmental Monitoring>
+<User Account Management, connectedTo, Web Server Configuration>
+<VPN Configuration, connectedTo, Proxy Server Configuration>
+<VPN Configuration, partOf, VPN Configuration>
+<Virtual Desktop Infrastructure, connectedTo, User Account Management>
+<Web Server Configuration, connectedTo, Antivirus and Endpoint Protection>
diff --git a/test/graphviz/scanned_hard/graphviz_312.dot b/test/graphviz/scanned_hard/graphviz_312.dot
new file mode 100644
index 0000000000000000000000000000000000000000..22fb4aaa6e2827ec0b345eb039e42657cb8005b5
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_312.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=BT
+	N0 [label="Security in DevOps" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N1 [label="Chaos Engineering" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N2 [label="Container Orchestration" color="#AB47BC" fillcolor="#F3E5F5" shape=octagon style=filled]
+	N3 [label=ChatOps color="#FBC02D" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+	N4 [label="Infrastructure Provisioning" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N5 [label="Monitoring and Logging" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N6 [label="Cost Optimization in Cloud DevOps" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N7 [label="Feature Flags" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N8 [label="Automated Deployment" color="#FBC02D" fillcolor="#FFFDE7" shape=folder style=filled]
+	N9 [label=Containerization color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N10 [label="Secrets Management" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N11 [label="Immutable Infrastructure" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Site Reliability Engineering Principles" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Automated Rollbacks" color="#FBC02D" fillcolor="#FFFDE7" shape=folder style=filled]
+		nest0_1 [label="Serverless Deployment" color="#AB47BC" fillcolor="#F3E5F5" shape=folder style=filled]
+		nest0_2 [label="Microservices Architecture" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Version Control" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Rollback Strategies" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest1_1 [label=GitOps color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N9 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	M2 -> N3 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_312.txt b/test/graphviz/scanned_hard/graphviz_312.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7b8ef5864f439c951012727d7c8df93e5fe28866
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_312.txt
@@ -0,0 +1,36 @@
+<Automated Deployment, connectedTo, Containerization>
+<Automated Rollbacks, connectedTo, Serverless Deployment>
+<Automated Rollbacks, partOf, Automated Rollbacks>
+<Chaos Engineering, connectedTo, Automated Rollbacks>
+<Chaos Engineering, connectedTo, ChatOps>
+<Chaos Engineering, connectedTo, Container Orchestration>
+<Chaos Engineering, connectedTo, Infrastructure Provisioning>
+<ChatOps, connectedTo, Infrastructure Provisioning>
+<Container Orchestration, connectedTo, ChatOps>
+<Container Orchestration, connectedTo, Infrastructure Provisioning>
+<Container Orchestration, connectedTo, Secrets Management>
+<Containerization, connectedTo, Secrets Management>
+<Cost Optimization in Cloud DevOps, connectedTo, Automated Deployment>
+<Cost Optimization in Cloud DevOps, connectedTo, Containerization>
+<Cost Optimization in Cloud DevOps, connectedTo, Feature Flags>
+<Cost Optimization in Cloud DevOps, connectedTo, Immutable Infrastructure>
+<Cost Optimization in Cloud DevOps, connectedTo, Secrets Management>
+<Feature Flags, connectedTo, Automated Deployment>
+<Feature Flags, connectedTo, Rollback Strategies>
+<GitOps, connectedTo, Containerization>
+<GitOps, partOf, GitOps>
+<Infrastructure Provisioning, connectedTo, Feature Flags>
+<Infrastructure Provisioning, connectedTo, Immutable Infrastructure>
+<Infrastructure Provisioning, connectedTo, Monitoring and Logging>
+<Microservices Architecture, connectedTo, Cost Optimization in Cloud DevOps>
+<Microservices Architecture, partOf, Microservices Architecture>
+<Monitoring and Logging, connectedTo, Cost Optimization in Cloud DevOps>
+<Monitoring and Logging, connectedTo, Secrets Management>
+<Rollback Strategies, connectedTo, GitOps>
+<Rollback Strategies, partOf, Rollback Strategies>
+<Secrets Management, connectedTo, Immutable Infrastructure>
+<Security in DevOps, connectedTo, Chaos Engineering>
+<Security in DevOps, connectedTo, ChatOps>
+<Security in DevOps, connectedTo, Infrastructure Provisioning>
+<Serverless Deployment, connectedTo, Microservices Architecture>
+<Serverless Deployment, partOf, Serverless Deployment>
diff --git a/test/graphviz/scanned_hard/graphviz_314.dot b/test/graphviz/scanned_hard/graphviz_314.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cda719745759c9e5b5bda6555990e33814379a81
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_314.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=BT
+	N0 [label="Firmware Development" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N1 [label="Actuator Control" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N2 [label="Thermal Management" color="#FFDA4E" fillcolor="#FFE88D" shape=hexagon style=filled]
+	N3 [label="Testing and Validation" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N4 [label="Failure Analysis" color="#AF56A6" fillcolor="#DDCEDD" shape=plaintext style=filled]
+	N5 [label="Material Selection" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N6 [label="Cost Optimization" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N7 [label="Microcontroller Programming" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N8 [label="Schematic Capture" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N9 [label="PCB Layout" color="#FFDA4E" fillcolor="#FFE88D" shape=folder style=filled]
+	N10 [label="Environmental Testing" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N11 [label=Documentation color="#AF56A6" fillcolor="#DDCEDD" shape=parallelogram style=filled]
+	N12 [label="Manufacturing Process Planning" color="#FFDA4E" fillcolor="#FFE88D" shape=diamond style=filled]
+	N13 [label="FPGA Design" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N14 [label="Troubleshooting and Debugging" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N15 [label="Regulatory Compliance" color="#FFDA4E" fillcolor="#FFE88D" shape=hexagon style=filled]
+	N16 [label="Power Management Design" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	S0 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="ASIC Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Test Fixture Design" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest0_1 [label="Reverse Engineering" color="#FFDA4E" fillcolor="#FFE88D" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Optical Module Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Circuit Design" color="#AF56A6" fillcolor="#DDCEDD" shape=oval style=filled]
+		nest1_1 [label="Assembly Line Optimization" color="#FFDA4E" fillcolor="#FFE88D" shape=Mdiamond style=filled]
+		nest1_2 [label="High_Speed Digital Design" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="manages EMC" color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [label="lays out PCBs" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N16 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N5 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [label="performs reverse engineering" color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S1 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label="analyzes failures" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_314.txt b/test/graphviz/scanned_hard/graphviz_314.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e6b6753874e7a63fe4cb03f6a3a2d0fa60d1520c
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_314.txt
@@ -0,0 +1,38 @@
+<Actuator Control, connectedTo, Failure Analysis>
+<Actuator Control, connectedTo, Test Fixture Design>
+<Actuator Control, connectedTo, Thermal Management>
+<Assembly Line Optimization, connectedTo, High_Speed Digital Design>
+<Assembly Line Optimization, partOf, Assembly Line Optimization>
+<Circuit Design, connectedTo, Assembly Line Optimization>
+<Circuit Design, partOf, Circuit Design>
+<Cost Optimization, connectedTo, Microcontroller Programming>
+<Documentation, connectedTo, Manufacturing Process Planning>
+<Environmental Testing, connectedTo, Documentation>
+<FPGA Design, lays out PCBs, Troubleshooting and Debugging>
+<Failure Analysis, connectedTo, Material Selection>
+<Firmware Development, analyzes failures, Failure Analysis>
+<Firmware Development, connectedTo, Actuator Control>
+<Firmware Development, connectedTo, Microcontroller Programming>
+<Firmware Development, connectedTo, Testing and Validation>
+<Firmware Development, connectedTo, Thermal Management>
+<Firmware Development, performs reverse engineering, PCB Layout>
+<High_Speed Digital Design, connectedTo, Material Selection>
+<High_Speed Digital Design, partOf, High_Speed Digital Design>
+<Manufacturing Process Planning, connectedTo, FPGA Design>
+<Material Selection, manages EMC, Cost Optimization>
+<Microcontroller Programming, connectedTo, Documentation>
+<Microcontroller Programming, connectedTo, Regulatory Compliance>
+<Microcontroller Programming, connectedTo, Schematic Capture>
+<PCB Layout, connectedTo, Circuit Design>
+<PCB Layout, connectedTo, Environmental Testing>
+<Regulatory Compliance, connectedTo, Power Management Design>
+<Reverse Engineering, connectedTo, Power Management Design>
+<Reverse Engineering, partOf, Reverse Engineering>
+<Schematic Capture, connectedTo, PCB Layout>
+<Test Fixture Design, connectedTo, Reverse Engineering>
+<Test Fixture Design, partOf, Test Fixture Design>
+<Testing and Validation, connectedTo, Failure Analysis>
+<Thermal Management, connectedTo, Failure Analysis>
+<Thermal Management, connectedTo, Microcontroller Programming>
+<Thermal Management, connectedTo, Testing and Validation>
+<Troubleshooting and Debugging, connectedTo, Regulatory Compliance>
diff --git a/test/graphviz/scanned_hard/graphviz_317.txt b/test/graphviz/scanned_hard/graphviz_317.txt
new file mode 100644
index 0000000000000000000000000000000000000000..21f4030166c2ea20628a3efc7ea1f7288ee7e94c
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_317.txt
@@ -0,0 +1,30 @@
+<Academic Search, optimizes off_page, Video Search>
+<Algorithm Updates Monitoring, connectedTo, Competitor Keyword Analysis>
+<Algorithm Updates Monitoring, partOf, Algorithm Updates Monitoring>
+<Competitor Keyword Analysis, connectedTo, Local SEO>
+<Crawling Websites, connectedTo, Featured Snippets Optimization>
+<Crawling Websites, partOf, Crawling Websites>
+<Featured Snippets Optimization, connectedTo, Indexing Content>
+<Featured Snippets Optimization, partOf, Featured Snippets Optimization>
+<Google My Business Management, connectedTo, Algorithm Updates Monitoring>
+<Google My Business Management, partOf, Google My Business Management>
+<Indexing Content, connectedTo, Paid Search Advertising>
+<Indexing Content, partOf, Indexing Content>
+<Off_Page SEO, connectedTo, Competitor Keyword Analysis>
+<Off_Page SEO, connectedTo, Google My Business Management>
+<Paid Search Advertising, connectedTo, Video Search>
+<Paid Search Advertising, partOf, Paid Search Advertising>
+<Query Processing, connectedTo, Off_Page SEO>
+<Query Processing, connectedTo, Shopping Search>
+<Schema Markup Implementation, connectedTo, Off_Page SEO>
+<Schema Markup Implementation, connectedTo, Technical SEO>
+<Shopping Search, connectedTo, Competitor Keyword Analysis>
+<Shopping Search, connectedTo, Crawling Websites>
+<Shopping Search, connectedTo, Local SEO>
+<Shopping Search, indexes academic papers, Off_Page SEO>
+<Technical SEO, connectedTo, Academic Search>
+<Technical SEO, connectedTo, Competitor Keyword Analysis>
+<Technical SEO, connectedTo, Off_Page SEO>
+<Technical SEO, connectedTo, Video Search>
+<Video Search, connectedTo, Off_Page SEO>
+<Video Search, connectedTo, Query Processing>
diff --git a/test/graphviz/scanned_hard/graphviz_319.dot b/test/graphviz/scanned_hard/graphviz_319.dot
new file mode 100644
index 0000000000000000000000000000000000000000..89fefbf69e883b7eadb463dfad2de068402633a5
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_319.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=BT
+	N0 [label="Learning Management System Administration" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N1 [label="Virtual Field Trips" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+	N2 [label="AI in Online Education" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N3 [label="Feedback and Grading" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N4 [label="Student Engagement Strategies" color="#C0CA33" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N5 [label="Course Evaluation" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N6 [label="Discussion Forum Moderation" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N7 [label="Collaborative Projects" color="#C0CA33" fillcolor="#F9FBE7" shape=diamond style=filled]
+	N8 [label="Language Learning Platforms" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N9 [label="Gamification in Education" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N10 [label="Open Educational Resources Integration" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N11 [label="Accessibility Features" color="#4DD0E1" fillcolor="#C9F0F0" shape=octagon style=filled]
+	N12 [label="Online Tutoring" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N13 [label="Bootcamp Development" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N14 [label="Competency_Based Education" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N15 [label="Digital Badges" color="#C0CA33" fillcolor="#F9FBE7" shape=folder style=filled]
+	N16 [label="Virtual Classroom Facilitation" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	S0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Peer_to_Peer Learning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Micro_credential Programs" color="#FF9800" fillcolor="#FFE0B2" shape=Mdiamond style=filled]
+		nest0_1 [label="Learning Analytics" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Interactive Learning Activities" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Content Creation" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+		nest1_1 [label="Enrollment and Retention Strategies" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+		nest1_2 [label="Parent or Guardian Communication" color="#4DD0E1" fillcolor="#C9F0F0" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="creates courses" color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label="creates analytics dashboards" color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N8 [label="digitizes curriculum" color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N13 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N7 [label="provides formative assessment" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> S0 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S1 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N10 -> M1 [label="gamifies experiences" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N16 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_32.txt b/test/graphviz/scanned_hard/graphviz_32.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1b852467bde414050f03e97ba8d155b0fcf5f35c
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_32.txt
@@ -0,0 +1,8 @@
+<Distribution, connectedTo, Seasonal Collection Planning>
+<PR and Media Outreach, recycles, Seasonal Collection Planning>
+<PR and Media Outreach, sells, Sample Creation>
+<Retail Sales, connectedTo, Influencer Collaboration>
+<Sample Creation, connectedTo, Distribution>
+<Seasonal Collection Planning, cuts, Retail Sales>
+<Supply Chain Transparency, connectedTo, Trend Research>
+<Trend Research, innovates, PR and Media Outreach>
diff --git a/test/graphviz/scanned_hard/graphviz_320.dot b/test/graphviz/scanned_hard/graphviz_320.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cb3170546e52485a997164abfb32cdfeca854f02
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_320.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=BT
+	N0 [label="Employer Recognition" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N1 [label="Subscription Models" color="#F44336" fillcolor="#FFCDD2" shape=plaintext style=filled]
+	N2 [label="Course Pilot Testing" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N3 [label="Assessment Creation" color="#F44336" fillcolor="#FFCDD2" shape=octagon style=filled]
+	N4 [label="University Partnerships" color="#4DB6AC" fillcolor="#E0F2F1" shape=oval style=filled]
+	N5 [label="Technical Infrastructure for Scale" color="#03A9F4" fillcolor="#B3E5FC" shape=octagon style=filled]
+	N6 [label="Course Retirement Planning" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N7 [label="Micro_credential Stacking" color="#4DB6AC" fillcolor="#E0F2F1" shape=folder style=filled]
+	N8 [label="Financial Aid for Learners" color="#03A9F4" fillcolor="#B3E5FC" shape=Mdiamond style=filled]
+	N9 [label="Instructor_Led Sessions" color="#F44336" fillcolor="#FFCDD2" shape=folder style=filled]
+	N10 [label="Engagement Metrics Tracking" color="#F44336" fillcolor="#FFCDD2" shape=folder style=filled]
+	N11 [label="Learner Analytics" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	S0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Specialization or Professional Certificate Programs" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Course Audit Options" color="#4DB6AC" fillcolor="#E0F2F1" shape=diamond style=filled]
+		nest0_1 [label="Mobile Learning Experience" color="#4DB6AC" fillcolor="#E0F2F1" shape=diamond style=filled]
+		nest0_2 [label="Continuous Course Improvement" color="#03A9F4" fillcolor="#B3E5FC" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Verified Track Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Completion Rate Optimization" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest1_1 [label="Global Accessibility Features" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_2 [label="Course Promotion" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N10 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N8 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [label="evaluates effectiveness" color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_321.txt b/test/graphviz/scanned_hard/graphviz_321.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a6106eb24dd7ef1d4a5421b2ba6bf87a321a527f
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_321.txt
@@ -0,0 +1,41 @@
+<Adaptive Learning Algorithms, connectedTo, Writing Skills Improvement>
+<Adaptive Learning Algorithms, partOf, Adaptive Learning Algorithms>
+<Certification Exam Prep, connectedTo, Subject Matter Review>
+<College Entrance Exam Prep, connectedTo, Question Bank Management>
+<College Entrance Exam Prep, partOf, College Entrance Exam Prep>
+<Critical Thinking Development, connectedTo, Question Bank Management>
+<Exam Day Tips, connectedTo, Interactive Exercises>
+<Exam Day Tips, connectedTo, Study Group Facilitation>
+<Interactive Exercises, markets, Memory Techniques Training>
+<Math Skills Refresher, connectedTo, Exam Day Tips>
+<Math Skills Refresher, connectedTo, Interactive Exercises>
+<Memory Techniques Training, connectedTo, Critical Thinking Development>
+<Memory Techniques Training, connectedTo, Virtual Proctoring>
+<Motivation Coaching, connectedTo, Test_Taking Strategies>
+<Motivation Coaching, partOf, Motivation Coaching>
+<Performance Prediction Models, connectedTo, Exam Day Tips>
+<Performance Prediction Models, connectedTo, Interactive Exercises>
+<Performance Prediction Models, connectedTo, Study Material Design>
+<Question Bank Management, connectedTo, Certification Exam Prep>
+<Question Bank Management, connectedTo, Reading Comprehension Drills>
+<Question Bank Management, connectedTo, Virtual Proctoring>
+<Reading Comprehension Drills, analyzes, Certification Exam Prep>
+<Reading Comprehension Drills, connectedTo, Subject Matter Review>
+<Reading Comprehension Drills, connectedTo, Virtual Proctoring>
+<Score Analysis, connectedTo, Certification Exam Prep>
+<Stress Management for Exams, connectedTo, Memory Techniques Training>
+<Stress Management for Exams, partOf, Stress Management for Exams>
+<Study Group Facilitation, connectedTo, Motivation Coaching>
+<Study Group Facilitation, partOf, Study Group Facilitation>
+<Study Material Design, connectedTo, Critical Thinking Development>
+<Study Material Design, connectedTo, Exam Day Tips>
+<Study Material Design, connectedTo, Interactive Exercises>
+<Study Material Design, connectedTo, Math Skills Refresher>
+<Study Material Design, connectedTo, Virtual Proctoring>
+<Subject Matter Review, connectedTo, Video Lecture Production>
+<Test_Taking Strategies, connectedTo, College Entrance Exam Prep>
+<Test_Taking Strategies, partOf, Test_Taking Strategies>
+<Virtual Proctoring, connectedTo, Adaptive Learning Algorithms>
+<Virtual Proctoring, connectedTo, Score Analysis>
+<Writing Skills Improvement, connectedTo, Stress Management for Exams>
+<Writing Skills Improvement, partOf, Writing Skills Improvement>
diff --git a/test/graphviz/scanned_hard/graphviz_322.dot b/test/graphviz/scanned_hard/graphviz_322.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3701965a44dfbd37a205e6db8f7b489e24f44adf
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_322.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=RL
+	N0 [label="Adult Language Learning" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N1 [label="Progress Tracking" color="#4DB6AC" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N2 [label="Writing Exercises" color="#4DB6AC" fillcolor="#E0F2F1" shape=diamond style=filled]
+	N3 [label="Speaking Practice" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N4 [label="Contextual Learning" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N5 [label="Audio Lessons" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N6 [label="Travel Language Essentials" color="#BA68C8" fillcolor="#F3E5F5" shape=folder style=filled]
+	N7 [label="Language Assessment Tests" color="#4DB6AC" fillcolor="#E0F2F1" shape=oval style=filled]
+	N8 [label="Online Tutoring Sessions" color="#E91E63" fillcolor="#FCE4EC" shape=octagon style=filled]
+	N9 [label="Listening Comprehension" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N10 [label="Error Correction Feedback" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N11 [label="Accent Reduction Coaching" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N12 [label="Reading Comprehension" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N13 [label="Vocabulary Acquisition" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	S0 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Grammar Practice" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Curriculum Customization" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+		nest0_1 [label="Role_Playing Scenarios" color="#BA68C8" fillcolor="#F3E5F5" shape=diamond style=filled]
+		nest0_2 [label="Native Speaker Interaction" color="#4DB6AC" fillcolor="#E0F2F1" shape=folder style=filled]
+		nest0_3 [label="Business Language Training" color="#E91E63" fillcolor="#FCE4EC" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [label=connects color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Slang and Idioms Learning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Instructor_Led Classes" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+		nest1_1 [label="Gamified Learning Activities" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+		nest1_2 [label="Language Exchange Programs" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=distributes color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=engages color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N12 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [label=publishes color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S2 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [label=practices color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=provides color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_323.dot b/test/graphviz/scanned_hard/graphviz_323.dot
new file mode 100644
index 0000000000000000000000000000000000000000..723a3f8bd951303888731e135b396920509d9c76
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_323.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=BT
+	N0 [label="Schizophrenia Management" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N1 [label="Grief Counseling" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N2 [label="Mental Health Screening" color="#388E3C" fillcolor="#F1F8E9" shape=oval style=filled]
+	N3 [label="Coping Skill Development" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N4 [label="Child & Adolescent Therapy" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N5 [label="Art Therapy" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N6 [label="Relapse Prevention" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N7 [label="Cognitive Behavioral Therapy" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N8 [label="Mindfulness Practice" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N9 [label="Digital Mental Health Tools" color="#CDDC39" fillcolor="#E6EE9C" shape=Mdiamond style=filled]
+	N10 [label="Medication Management" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+	N11 [label="Diagnosis and Assessment" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	S0 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Support Group Facilitation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Inpatient Treatment Coordination" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+		nest0_1 [label="Bipolar Disorder Management" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Group Therapy" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Trauma Therapy" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+		nest1_1 [label="Telehealth Counseling" color="#CDDC39" fillcolor="#E6EE9C" shape=octagon style=filled]
+		nest1_2 [label="Therapy Session" color="#CDDC39" fillcolor="#E6EE9C" shape=octagon style=filled]
+		nest1_3 [label="Psychiatric Evaluation" color="#388E3C" fillcolor="#F1F8E9" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [label=refers color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=rehabilitates color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=monitors color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=complies color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=secures color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=provides color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
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+	nest0_1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
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+	nest1_3 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
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+	S0 -> N10 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N6 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_324.dot b/test/graphviz/scanned_hard/graphviz_324.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4e244f93916f23cc7587273b90995854df41ba21
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_324.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=BT
+	N0 [label="Sports Nutrition" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N1 [label="Weight Management" color="#CDDC39" fillcolor="#E6EE9C" shape=oval style=filled]
+	N2 [label="Child Nutrition" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N3 [label="Maternal Nutrition" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N4 [label="Public Health Nutrition Programs" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N5 [label="Food Label Interpretation" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N6 [label="Food Preparation Guidance" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N7 [label="Supplement Recommendation" color="#CDDC39" fillcolor="#E6EE9C" shape=Mdiamond style=filled]
+	N8 [label="Gut Microbiome Health" color="#388E3C" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N9 [label="Elderly Nutrition" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N10 [label="Community Nutrition Workshops" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N11 [label="Metabolism Rate Assessment" color="#BDAFA8" fillcolor="#E4E0DF" shape=octagon style=filled]
+	N12 [label="Food Waste Reduction" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N13 [label="Disease_Specific Nutrition" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	S0 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	M0 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Nutrigenomics Research" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Food Allergy Management" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+		nest0_1 [label="Nutritional Biomarker Analysis" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+		nest0_2 [label="Sustainable Food Systems" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+		nest0_3 [label="Grocery Shopping Guidance" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Inflammation and Diet" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Nutritional Counseling" color="#BDAFA8" fillcolor="#E4E0DF" shape=folder style=filled]
+		nest1_1 [label="Food Fortification Strategies" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+		nest1_2 [label="Dietary Assessment" color="#BDAFA8" fillcolor="#E4E0DF" shape=oval style=filled]
+		nest1_3 [label="Body Composition Analysis" color="#BDAFA8" fillcolor="#E4E0DF" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=advises color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=promotes color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N7 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N4 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N9 -> S2 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [label=inspects color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N11 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_325.dot b/test/graphviz/scanned_hard/graphviz_325.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ec100d91904954dad92108d828cb89d4db7f7d45
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_325.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=RL
+	N0 [label="Flexibility Training" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Yoga Instruction" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N2 [label="Pilates Instruction" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N3 [label="Online Fitness Coaching" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N4 [label="Hydration for Exercise" color="#7986CB" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	N5 [label="Body Composition Analysis" color="#EAEFA5" fillcolor="#FDFCEB" shape=Mdiamond style=filled]
+	N6 [label="Cardiovascular Training" color="#EAEFA5" fillcolor="#FDFCEB" shape=diamond style=filled]
+	N7 [label="Sports_Specific Training" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N8 [label="Recovery Strategies" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	S0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Wearable Fitness Devices" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="HIIT Workouts" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+		nest0_1 [label="Outdoor Fitness Activities" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+		nest0_2 [label="Fitness Assessment" color="#FF5722" fillcolor="#FFCCBC" shape=octagon style=filled]
+		nest0_3 [label="Corporate Wellness Programs" color="#7986CB" fillcolor="#E8EAF6" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [label=optimizes color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Rehabilitation Exercises" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Posture Correction" color="#7986CB" fillcolor="#E8EAF6" shape=diamond style=filled]
+		nest1_1 [label="Weightlifting Techniques" color="#EAEFA5" fillcolor="#FDFCEB" shape=octagon style=filled]
+		nest1_2 [label="Personal Training" color="#7986CB" fillcolor="#E8EAF6" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [label=educates color="#7986CB" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=rehabilitates color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N7 [label=researches color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest1_0 [label=predicts color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N1 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S2 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N5 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [label=engages color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label=personalizes color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_326.dot b/test/graphviz/scanned_hard/graphviz_326.dot
new file mode 100644
index 0000000000000000000000000000000000000000..54454f615d86326511c10a37700d0dc1815dd5e3
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_326.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=LR
+	N0 [label="Behavior Change Support" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N1 [label="Work_Life Balance Coaching" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N2 [label="Self_Care Routine Development" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N3 [label="Digital Detox" color="#E91E63" fillcolor="#F8BBD0" shape=plaintext style=filled]
+	N4 [label="Massage Therapy" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N5 [label="Gut Health for Wellness" color="#E91E63" fillcolor="#F8BBD0" shape=octagon style=filled]
+	N6 [label="Positive Psychology Application" color="#00BCD4" fillcolor="#E0F7FA" shape=oval style=filled]
+	N7 [label="Physical Activity Planning" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N8 [label="Acupuncture Consultation" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N9 [label=Hydrotherapy color="#B8C0F5" fillcolor="#ECF0FD" shape=diamond style=filled]
+	N10 [label="Longevity Planning" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N11 [label="Meditation Coaching" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N12 [label="Employee Wellness Programs" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N13 [label="Resilience Building" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N14 [label="Biofeedback Training" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Alternative Therapies" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Health Coaching" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+		nest0_1 [label="Emotional Well_being" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Wellness Retreat Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Stress Management" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+		nest1_1 [label="Holistic Health Assessment" color="#B8C0F5" fillcolor="#ECF0FD" shape=oval style=filled]
+		nest1_2 [label="Financial Wellness Planning" color="#E91E63" fillcolor="#F8BBD0" shape=octagon style=filled]
+		nest1_3 [label="Spiritual Exploration" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=complies color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=programs color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=personalizes color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N12 -> nest0_0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [label=moves color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N13 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_328.dot b/test/graphviz/scanned_hard/graphviz_328.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c3785b344112f8dc13a7e7093e98d2c74eda079c
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_328.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=TD
+	N0 [label="Domain_Specific Translation Models" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N1 [label="Custom Vocabulary Integration" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	N2 [label="Medical Translation" color="#CDDC39" fillcolor="#E6EE9C" shape=plaintext style=filled]
+	N3 [label="Speaker Diarization" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N4 [label="Continuous Learning Models for Translation" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N5 [label="Pronunciation Correction" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N6 [label="Emotion Detection in Speech" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N7 [label="Real_Time Captioning" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N8 [label="Customer Support Translation" color="#00BCD4" fillcolor="#B2EBF2" shape=plaintext style=filled]
+	N9 [label="Language Detection" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N10 [label="Offline Translation Capabilities" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	S0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Text_to_Speech Synthesis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cross_Lingual Communication" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+		nest0_1 [label="Contextual Understanding" color="#00BCD4" fillcolor="#B2EBF2" shape=octagon style=filled]
+		nest0_2 [label="Technical Manual Translation" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Glossary Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Wearable Translation Devices" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest1_1 [label="Machine Translation Engine" color="#A1D7CD" fillcolor="#EDF5F3" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=captures color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [label=customizes color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [label=generates color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [label=translates color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N0 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_328.txt b/test/graphviz/scanned_hard/graphviz_328.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3271827f0c03f224b5cd333c07af98839dd70fa1
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_328.txt
@@ -0,0 +1,34 @@
+<Contextual Understanding, connectedTo, Technical Manual Translation>
+<Contextual Understanding, partOf, Contextual Understanding>
+<Continuous Learning Models for Translation, connectedTo, Pronunciation Correction>
+<Cross_Lingual Communication, connectedTo, Contextual Understanding>
+<Cross_Lingual Communication, partOf, Cross_Lingual Communication>
+<Custom Vocabulary Integration, connectedTo, Medical Translation>
+<Custom Vocabulary Integration, connectedTo, Speaker Diarization>
+<Customer Support Translation, connectedTo, Language Detection>
+<Domain_Specific Translation Models, captures, Custom Vocabulary Integration>
+<Domain_Specific Translation Models, connectedTo, Continuous Learning Models for Translation>
+<Domain_Specific Translation Models, connectedTo, Customer Support Translation>
+<Domain_Specific Translation Models, connectedTo, Medical Translation>
+<Domain_Specific Translation Models, connectedTo, Offline Translation Capabilities>
+<Domain_Specific Translation Models, connectedTo, Real_Time Captioning>
+<Domain_Specific Translation Models, connectedTo, Speaker Diarization>
+<Domain_Specific Translation Models, generates, Real_Time Captioning>
+<Emotion Detection in Speech, connectedTo, Real_Time Captioning>
+<Language Detection, connectedTo, Offline Translation Capabilities>
+<Machine Translation Engine, connectedTo, Emotion Detection in Speech>
+<Machine Translation Engine, partOf, Machine Translation Engine>
+<Medical Translation, connectedTo, Cross_Lingual Communication>
+<Medical Translation, connectedTo, Speaker Diarization>
+<Pronunciation Correction, connectedTo, Customer Support Translation>
+<Pronunciation Correction, connectedTo, Emotion Detection in Speech>
+<Pronunciation Correction, connectedTo, Language Detection>
+<Pronunciation Correction, connectedTo, Offline Translation Capabilities>
+<Pronunciation Correction, translates, Real_Time Captioning>
+<Real_Time Captioning, connectedTo, Customer Support Translation>
+<Real_Time Captioning, customizes, Wearable Translation Devices>
+<Speaker Diarization, connectedTo, Continuous Learning Models for Translation>
+<Technical Manual Translation, connectedTo, Medical Translation>
+<Technical Manual Translation, partOf, Technical Manual Translation>
+<Wearable Translation Devices, connectedTo, Machine Translation Engine>
+<Wearable Translation Devices, partOf, Wearable Translation Devices>
diff --git a/test/graphviz/scanned_hard/graphviz_329.dot b/test/graphviz/scanned_hard/graphviz_329.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e7d3bac60e3c884cdd4f83baeac280470fc9feca
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_329.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=BT
+	N0 [label="Delivery Services" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N1 [label="Mapping and Surveying" color="#7E57C2" fillcolor="#EDE7F6" shape=oval style=filled]
+	N2 [label="Remote Piloting Training" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N3 [label="Ethical Drone Use" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N4 [label="Precision Agriculture" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N5 [label="Sensor Integration" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N6 [label="Flight Planning Software" color="#FF8A65" fillcolor="#FBE9E7" shape=Mdiamond style=filled]
+	N7 [label=Videography color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+	N8 [label="Drone Regulations Compliance" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N9 [label="Counter_Drone Systems" color="#FF8A65" fillcolor="#FBE9E7" shape=Mdiamond style=filled]
+	N10 [label="Payload Customization" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N11 [label="Drone Maintenance" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N12 [label="Autonomous Flight" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N13 [label="Thermal Imaging with Drones" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N14 [label="Security Surveillance" color="#66BB6A" fillcolor="#E8F5E9" shape=parallelogram style=filled]
+	N15 [label="Collision Avoidance Systems" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N16 [label="Environmental Monitoring" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	S0 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#66BB6A" fillcolor="#E8F5E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Search and Rescue Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Drone Data Security" color="#7E57C2" fillcolor="#EDE7F6" shape=diamond style=filled]
+		nest0_1 [label="Data Processing from Drones" color="#FF8A65" fillcolor="#FBE9E7" shape=Mdiamond style=filled]
+		nest0_2 [label="Navigation System" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Propeller Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Communication Systems" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+		nest1_1 [label="Geofencing Implementation" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=educates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [label=flies color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> nest1_0 [label=programs color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N4 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N12 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [label=analyzes color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N0 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [label=transmits color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [label=manufactures color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N9 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [label=delivers color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_33.dot b/test/graphviz/scanned_hard/graphviz_33.dot
new file mode 100644
index 0000000000000000000000000000000000000000..410b68ce7d8b93ecfd6631a3a6adb1f5b4c67684
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_33.dot
@@ -0,0 +1,26 @@
+digraph {
+	rankdir=BT
+	N0 [label="Workforce Planning" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Interview Scheduling" color="#388E3C" fillcolor="#C8E6C9" shape=octagon style=filled]
+	N2 [label="HR Policy Development" color="#388E3C" fillcolor="#C8E6C9" shape=oval style=filled]
+	N3 [label="Employee Engagement Surveys" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N4 [label="Disciplinary Procedures" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N5 [label="HR Analytics" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N6 [label="Candidate Sourcing" color="#388E3C" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N7 [label="Conflict Resolution" color="#FFF9AE" fillcolor="#FFFCE6" shape=diamond style=filled]
+	N8 [label="Leave Management" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+	N9 [label="Change Management" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N10 [label="Health and Safety Management" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N0 -> N1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=resolves color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=strategies color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=records color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=administers color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=integrates color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N9 [label=manages color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N1 [label=analyzes color="#AED581" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_330.dot b/test/graphviz/scanned_hard/graphviz_330.dot
new file mode 100644
index 0000000000000000000000000000000000000000..59d25ea2efc0965f13b6ec74cf579196091da437
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_330.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=LR
+	N0 [label="Pedestrian Detection" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N1 [label="Battery Management for EVs" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N2 [label="Map Data Management" color="#E0E0E0" fillcolor="#EBEBEB" shape=plaintext style=filled]
+	N3 [label="Perception System" color="#F7BEE0" fillcolor="#FAEBF3" shape=oval style=filled]
+	N4 [label="Regulatory Compliance" color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+	N5 [label="Parking Assistance Systems" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N6 [label="Redundancy in Sensors" color="#F7BEE0" fillcolor="#FAEBF3" shape=folder style=filled]
+	N7 [label="Adaptive Cruise Control" color="#F7BEE0" fillcolor="#FAEBF3" shape=plaintext style=filled]
+	N8 [label="Vehicle_to_Vehicle Communication" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N9 [label="Automatic Emergency Braking" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N10 [label="Public Acceptance and Trust" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N11 [label="Ethical Decision_Making" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N12 [label="Sensor Integration" color="#F7BEE0" fillcolor="#FAEBF3" shape=parallelogram style=filled]
+	N13 [label="Accident Reconstruction for AVs" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	S1 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Fleet Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Human_Machine Interface" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+		nest0_1 [label="Path Planning" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Charging Infrastructure" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Hardware Design" color="#E0E0E0" fillcolor="#EBEBEB" shape=octagon style=filled]
+		nest1_1 [label="Predictive Maintenance" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=localizes color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N3 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> S1 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N3 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_331.dot b/test/graphviz/scanned_hard/graphviz_331.dot
new file mode 100644
index 0000000000000000000000000000000000000000..36b80f1351a5d03a6d04fdc78d9fb13bab365321
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_331.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=BT
+	N0 [label="Parking Integration" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Payment Processing" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N2 [label="Demand Prediction" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N3 [label="Vehicle Rebalancing" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N4 [label="Maintenance Scheduling" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N5 [label="Geofencing for Operations" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N6 [label="Driver Management" color="#00BCD4" fillcolor="#E0F7FA" shape=diamond style=filled]
+	N7 [label="Policy Advocacy for Shared Mobility" color="#FFA726" fillcolor="#FFF3E0" shape=folder style=filled]
+	N8 [label="User Rating and Feedback Systems" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N9 [label="Autonomous Shared Vehicles" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N10 [label="Smart City Integration" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N11 [label="User Registration" color="#00BCD4" fillcolor="#E0F7FA" shape=plaintext style=filled]
+	N12 [label="Subscription Model Management" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N13 [label="Customer Support" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N14 [label="Route Optimization" color="#00BCD4" fillcolor="#E0F7FA" shape=Mdiamond style=filled]
+	N15 [label="Accessibility for Users" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N16 [label="Platform Development" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	S0 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Car_sharing Services" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Vehicle Booking" color="#03A9F4" fillcolor="#B3E5FC" shape=diamond style=filled]
+		nest0_1 [label="User Onboarding" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_2 [label="Micro_mobility Management" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Carbon Emission Tracking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Regulatory Compliance" color="#03A9F4" fillcolor="#B3E5FC" shape=plaintext style=filled]
+		nest1_1 [label="Fleet Management" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=dispatches color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=insures color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest0_0 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N10 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [label=optimizes color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N10 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_332.txt b/test/graphviz/scanned_hard/graphviz_332.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6f2c45c3c9dfb549d279a33479f5449f5a8980c4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_332.txt
@@ -0,0 +1,35 @@
+<Access Control Systems, connectedTo, Barrier Gate Control>
+<Access Control Systems, connectedTo, Edge Computing for Parking Data>
+<Access Control Systems, connectedTo, Navigation to Open Space>
+<Access Control Systems, connectedTo, Permit Management>
+<Access Control Systems, connectedTo, Smart Parking Meters>
+<Access Control Systems, connectedTo, Valet Parking Automation>
+<Automated Payment, connectedTo, Edge Computing for Parking Data>
+<Automated Payment, connectedTo, Real_Time Information Display>
+<Automated Payment, connectedTo, Valet Parking Automation>
+<Barrier Gate Control, connectedTo, Edge Computing for Parking Data>
+<Cloud_based Parking Platforms, connectedTo, Parking Guidance Systems>
+<Cloud_based Parking Platforms, partOf, Cloud_based Parking Platforms>
+<Customer Support, connectedTo, Fleet Parking Solutions>
+<Data Analytics for Parking Usage, connectedTo, Parking Guidance Systems>
+<Dynamic Pricing, connectedTo, Space Detection>
+<Electric Vehicle Charging Integration, connectedTo, Revenue Management>
+<Electric Vehicle Charging Integration, develops, Customer Support>
+<Fleet Parking Solutions, connectedTo, Dynamic Pricing>
+<Fleet Parking Solutions, connectedTo, Revenue Management>
+<Intelligent Traffic Management Interaction, connectedTo, Revenue Management>
+<Mobile Parking Apps, guides, Navigation to Open Space>
+<Mobile Parking Apps, partOf, Mobile Parking Apps>
+<Navigation to Open Space, connectedTo, Automated Payment>
+<Parking Guidance Systems, connectedTo, Intelligent Traffic Management Interaction>
+<Parking Guidance Systems, guides, Revenue Management>
+<Permit Management, connectedTo, Mobile Parking Apps>
+<Permit Management, partOf, Permit Management>
+<Real_Time Information Display, connectedTo, Barrier Gate Control>
+<Reservations System, connectedTo, Cloud_based Parking Platforms>
+<Reservations System, partOf, Reservations System>
+<Revenue Management, connectedTo, Access Control Systems>
+<Smart Parking Meters, connectedTo, Real_Time Information Display>
+<Space Detection, connectedTo, Data Analytics for Parking Usage>
+<Space Detection, connectedTo, Reservations System>
+<Valet Parking Automation, connectedTo, Smart Parking Meters>
diff --git a/test/graphviz/scanned_hard/graphviz_334.dot b/test/graphviz/scanned_hard/graphviz_334.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3637b319e21866270f0519ce29796cd82a0e43c4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_334.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=LR
+	N0 [label="Election Official Training" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label=Transparency color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+	N2 [label="Voter Registration" color="#FFA726" fillcolor="#FFF3E0" shape=parallelogram style=filled]
+	N3 [label="System Certification" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N4 [label="Vote Counting" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N5 [label="Security Protocols" color="#8C9EFF" fillcolor="#D3D7EB" shape=parallelogram style=filled]
+	N6 [label="Accessibility Features" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N7 [label="Biometric Voter ID" color="#AB47BC" fillcolor="#F3E5F5" shape=Mdiamond style=filled]
+	N8 [label="Secure Data Transmission" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N9 [label="Voter Authentication" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N10 [label="Blockchain for Voting" color="#AB47BC" fillcolor="#F3E5F5" shape=oval style=filled]
+	N11 [label="Anonymous Credential Systems" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S0 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Remote Voting Solutions" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Voting Machine Design" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+		nest0_1 [label="Cybersecurity for Voting Systems" color="#8C9EFF" fillcolor="#D3D7EB" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Voter Privacy Protection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Public Trust Building" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+		nest1_1 [label="Optical Scan Systems" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+		nest1_2 [label="Online Voting Systems" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+		nest1_3 [label="Threat Modeling" color="#FFA726" fillcolor="#FFF3E0" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [label=casts color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=prevents color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=decrypts color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N6 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N7 -> S2 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [label=upgrades color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	M2 -> N7 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_337.dot b/test/graphviz/scanned_hard/graphviz_337.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9daa9167b5d361b38b8cafe872f3c13ce5123692
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_337.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=TD
+	N0 [label=Acquisitions color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N1 [label="Digitization Projects" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N2 [label="Federated Search" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	N3 [label="Technical Support for Systems" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N4 [label="User Account Management" color="#FFB74D" fillcolor="#FFF3E0" shape=parallelogram style=filled]
+	N5 [label="Interlibrary Loan" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N6 [label="Discovery Layers" color="#90A4AE" fillcolor="#ECEFF1" shape=folder style=filled]
+	N7 [label="Online Public Access Catalog" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N8 [label="Metadata Creation" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N9 [label="Electronic Resource Management" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N10 [label="System Security" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N11 [label="User Training on Systems" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N12 [label="Cataloging and Classification" color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N13 [label="Personalized Recommendations" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	S0 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Digital Resource Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="AI in Library Services" color="#FFE69C" fillcolor="#FFF9D4" shape=plaintext style=filled]
+		nest0_1 [label="Resource Sharing Networks" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest0_2 [label="Reference Desk Support" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest0_3 [label="Subject Indexing" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [label=protects color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Reporting and Analytics" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Circulation Management" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+		nest1_1 [label="Integrated Library Systems" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=displays color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N2 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S2 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [label=implements color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_337.txt b/test/graphviz/scanned_hard/graphviz_337.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8b5157d59bbb6f389d969016ddd9e4c7b7d132dc
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_337.txt
@@ -0,0 +1,39 @@
+<AI in Library Services, partOf, AI in Library Services>
+<AI in Library Services, protects, Resource Sharing Networks>
+<Acquisitions, connectedTo, Digitization Projects>
+<Acquisitions, connectedTo, Interlibrary Loan>
+<Acquisitions, connectedTo, Metadata Creation>
+<Cataloging and Classification, connectedTo, Personalized Recommendations>
+<Circulation Management, connectedTo, Integrated Library Systems>
+<Circulation Management, partOf, Circulation Management>
+<Digitization Projects, connectedTo, Federated Search>
+<Digitization Projects, connectedTo, Interlibrary Loan>
+<Discovery Layers, connectedTo, Online Public Access Catalog>
+<Electronic Resource Management, connectedTo, AI in Library Services>
+<Electronic Resource Management, connectedTo, System Security>
+<Federated Search, connectedTo, Interlibrary Loan>
+<Federated Search, connectedTo, Technical Support for Systems>
+<Federated Search, implements, Interlibrary Loan>
+<Integrated Library Systems, connectedTo, Federated Search>
+<Integrated Library Systems, partOf, Integrated Library Systems>
+<Interlibrary Loan, connectedTo, Metadata Creation>
+<Interlibrary Loan, displays, Discovery Layers>
+<Metadata Creation, connectedTo, Electronic Resource Management>
+<Online Public Access Catalog, connectedTo, Cataloging and Classification>
+<Online Public Access Catalog, connectedTo, Electronic Resource Management>
+<Online Public Access Catalog, connectedTo, Metadata Creation>
+<Reference Desk Support, connectedTo, Subject Indexing>
+<Reference Desk Support, partOf, Reference Desk Support>
+<Resource Sharing Networks, connectedTo, Reference Desk Support>
+<Resource Sharing Networks, partOf, Resource Sharing Networks>
+<Subject Indexing, connectedTo, Technical Support for Systems>
+<Subject Indexing, partOf, Subject Indexing>
+<System Security, connectedTo, User Training on Systems>
+<Technical Support for Systems, connectedTo, Cataloging and Classification>
+<Technical Support for Systems, connectedTo, Circulation Management>
+<Technical Support for Systems, connectedTo, Interlibrary Loan>
+<Technical Support for Systems, connectedTo, Metadata Creation>
+<Technical Support for Systems, connectedTo, User Account Management>
+<Technical Support for Systems, connectedTo, User Training on Systems>
+<User Account Management, connectedTo, Interlibrary Loan>
+<User Training on Systems, connectedTo, Cataloging and Classification>
diff --git a/test/graphviz/scanned_hard/graphviz_339.dot b/test/graphviz/scanned_hard/graphviz_339.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d8581be2873fdd818754078e4a73db90a0d5271e
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_339.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=TD
+	N0 [label="Wayfinding Systems" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Virtual Tours" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N2 [label="Digital Preservation Strategies" color="#FBC02D" fillcolor="#FFFDE7" shape=plaintext style=filled]
+	N3 [label="Interactive Kiosks" color="#BDBDBD" fillcolor="#F5F5F5" shape=diamond style=filled]
+	N4 [label="Digital Archiving" color="#FBC02D" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+	N5 [label="Exhibition Design" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N6 [label="Mobile App Development" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N7 [label="Security Systems Integration" color="#82DAFF" fillcolor="#C8EDFF" shape=plaintext style=filled]
+	N8 [label="Visitor Flow Analysis" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N9 [label="Content Management Systems" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N10 [label="Community Engagement Platforms" color="#FBC02D" fillcolor="#FFFDE7" shape=Mdiamond style=filled]
+	N11 [label="Virtual Reality Experiences" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	S0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Multisensory Exhibits" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="RFID for Object Tracking" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+		nest0_1 [label="Digital Signage" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+		nest0_2 [label="Online Shop Integration" color="#82DAFF" fillcolor="#C8EDFF" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Member Management Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Visitor Analytics" color="#82DAFF" fillcolor="#C8EDFF" shape=octagon style=filled]
+		nest1_1 [label="Environmental Control Systems" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest1_2 [label="Accessibility Technology for Visitors" color="#FBC02D" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+		nest1_3 [label="Robotics in Exhibits" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [label=collects color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N1 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N3 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_339.txt b/test/graphviz/scanned_hard/graphviz_339.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b52a311c25faddaf4de79cd8d1a94d2379553ab9
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_339.txt
@@ -0,0 +1,33 @@
+<Accessibility Technology for Visitors, connectedTo, Robotics in Exhibits>
+<Accessibility Technology for Visitors, partOf, Accessibility Technology for Visitors>
+<Community Engagement Platforms, connectedTo, Virtual Reality Experiences>
+<Content Management Systems, connectedTo, Community Engagement Platforms>
+<Content Management Systems, connectedTo, RFID for Object Tracking>
+<Digital Archiving, connectedTo, Exhibition Design>
+<Digital Preservation Strategies, connectedTo, Interactive Kiosks>
+<Digital Signage, connectedTo, Online Shop Integration>
+<Digital Signage, partOf, Digital Signage>
+<Environmental Control Systems, connectedTo, Accessibility Technology for Visitors>
+<Environmental Control Systems, partOf, Environmental Control Systems>
+<Exhibition Design, connectedTo, Mobile App Development>
+<Interactive Kiosks, connectedTo, Digital Archiving>
+<Mobile App Development, connectedTo, Security Systems Integration>
+<Online Shop Integration, connectedTo, Virtual Tours>
+<Online Shop Integration, partOf, Online Shop Integration>
+<RFID for Object Tracking, connectedTo, Digital Signage>
+<RFID for Object Tracking, partOf, RFID for Object Tracking>
+<Robotics in Exhibits, connectedTo, Virtual Reality Experiences>
+<Robotics in Exhibits, partOf, Robotics in Exhibits>
+<Security Systems Integration, connectedTo, Visitor Flow Analysis>
+<Virtual Tours, connectedTo, Digital Archiving>
+<Virtual Tours, connectedTo, Digital Preservation Strategies>
+<Virtual Tours, connectedTo, Interactive Kiosks>
+<Virtual Tours, connectedTo, Mobile App Development>
+<Virtual Tours, connectedTo, Visitor Flow Analysis>
+<Visitor Analytics, collects, Environmental Control Systems>
+<Visitor Analytics, partOf, Visitor Analytics>
+<Visitor Flow Analysis, connectedTo, Community Engagement Platforms>
+<Visitor Flow Analysis, connectedTo, Content Management Systems>
+<Visitor Flow Analysis, connectedTo, Virtual Reality Experiences>
+<Visitor Flow Analysis, connectedTo, Visitor Analytics>
+<Wayfinding Systems, connectedTo, Virtual Tours>
diff --git a/test/graphviz/scanned_hard/graphviz_34.dot b/test/graphviz/scanned_hard/graphviz_34.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e378c686ac66e4af414a977dc2848a6c9f3d9191
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_34.dot
@@ -0,0 +1,28 @@
+digraph {
+	rankdir=BT
+	N0 [label="Candidate Experience Management" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N1 [label="Job Fair Organization" color="#C0CA33" fillcolor="#F9FBE7" shape=octagon style=filled]
+	N2 [label="Contingent Workforce Management" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N3 [label="Internal Mobility" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N4 [label="Candidate Relationship Management" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N5 [label="Offer Extension" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N6 [label="Employee Referral Program" color="#A188D0" fillcolor="#DACBE3" shape=plaintext style=filled]
+	N7 [label=Negotiation color="#A188D0" fillcolor="#DACBE3" shape=Mdiamond style=filled]
+	N8 [label="Campus Recruitment" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N9 [label="Diversity Sourcing" color="#A188D0" fillcolor="#DACBE3" shape=folder style=filled]
+	N10 [label="Psychometric Testing" color="#C0CA33" fillcolor="#F9FBE7" shape=folder style=filled]
+	N11 [label="Job Description Creation" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N0 -> N1 [label=backgrounds color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=refers color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=posts color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=regulates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N1 [label=optimizes color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N1 [label=headhunts color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_341.dot b/test/graphviz/scanned_hard/graphviz_341.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1cdfb049b941886c04f0884b1a92168d66f1601b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_341.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=TD
+	N0 [label="Ballistics Analysis" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N1 [label="Forensic Anthropology" color="#9575CD" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N2 [label="Evidence Collection" color="#9575CD" fillcolor="#EDE7F6" shape=plaintext style=filled]
+	N3 [label="Evidence Preservation" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N4 [label="Fingerprint Analysis" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+	N5 [label="Forensic Odontology" color="#9575CD" fillcolor="#EDE7F6" shape=plaintext style=filled]
+	N6 [label="Voice Recognition" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N7 [label="Forensic Botany" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N8 [label="Polygraph Examination" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N9 [label="Trace Evidence Analysis" color="#26A69A" fillcolor="#E0F2F1" shape=oval style=filled]
+	N10 [label="Data Recovery" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	S1 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Forensic Entomology" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Forensic Photography" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+		nest0_1 [label="Toxicology Testing" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+		nest0_2 [label="Cold Case Review" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Forensic Pathology" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Document Examination" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+		nest1_1 [label="Cloud Forensics" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_2 [label="Mobile Device Forensics" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_3 [label="Toolmark Analysis" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [label=complies color="#81C784" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N9 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N6 [label=researches color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N6 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_1 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N0 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_341.txt b/test/graphviz/scanned_hard/graphviz_341.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2118cdb513ad30fa1521a2f8e3df7bed1b6b8788
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_341.txt
@@ -0,0 +1,33 @@
+<Ballistics Analysis, connectedTo, Forensic Anthropology>
+<Ballistics Analysis, connectedTo, Forensic Odontology>
+<Ballistics Analysis, researches, Voice Recognition>
+<Cloud Forensics, connectedTo, Mobile Device Forensics>
+<Cloud Forensics, partOf, Cloud Forensics>
+<Cold Case Review, connectedTo, Ballistics Analysis>
+<Cold Case Review, connectedTo, Fingerprint Analysis>
+<Cold Case Review, partOf, Cold Case Review>
+<Document Examination, connectedTo, Cloud Forensics>
+<Document Examination, partOf, Document Examination>
+<Evidence Collection, connectedTo, Data Recovery>
+<Evidence Collection, connectedTo, Evidence Preservation>
+<Evidence Collection, connectedTo, Forensic Odontology>
+<Evidence Preservation, connectedTo, Fingerprint Analysis>
+<Fingerprint Analysis, connectedTo, Forensic Odontology>
+<Fingerprint Analysis, connectedTo, Forensic Photography>
+<Fingerprint Analysis, connectedTo, Toxicology Testing>
+<Forensic Anthropology, connectedTo, Evidence Collection>
+<Forensic Botany, connectedTo, Polygraph Examination>
+<Forensic Odontology, complies, Document Examination>
+<Forensic Odontology, connectedTo, Voice Recognition>
+<Forensic Photography, connectedTo, Toxicology Testing>
+<Forensic Photography, partOf, Forensic Photography>
+<Mobile Device Forensics, connectedTo, Toolmark Analysis>
+<Mobile Device Forensics, partOf, Mobile Device Forensics>
+<Polygraph Examination, connectedTo, Trace Evidence Analysis>
+<Toolmark Analysis, connectedTo, Trace Evidence Analysis>
+<Toolmark Analysis, partOf, Toolmark Analysis>
+<Toxicology Testing, connectedTo, Cold Case Review>
+<Toxicology Testing, partOf, Toxicology Testing>
+<Trace Evidence Analysis, connectedTo, Data Recovery>
+<Trace Evidence Analysis, connectedTo, Voice Recognition>
+<Voice Recognition, connectedTo, Forensic Botany>
diff --git a/test/graphviz/scanned_hard/graphviz_342.dot b/test/graphviz/scanned_hard/graphviz_342.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e6db01fad2c79cd787a44269c20a308e5f69e5ec
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_342.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=BT
+	N0 [label="Insider Threat Programs" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N1 [label="Port Security" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N2 [label="Fusion Center Operations" color="#4DB6AC" fillcolor="#E0F2F1" shape=oval style=filled]
+	N3 [label=Counter_Propaganda color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N4 [label="Border Security" color="#4DB6AC" fillcolor="#E0F2F1" shape=plaintext style=filled]
+	N5 [label="Hostage Negotiation" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N6 [label="Airport Security" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N7 [label="Legislation and Policy Development" color="#BCB88A" fillcolor="#F5F5DC" shape=parallelogram style=filled]
+	N8 [label="Training Exercises" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N9 [label="Risk_Based Security Measures" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N10 [label="Forensic Investigation of Attacks" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N11 [label="Risk Analysis" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N12 [label="Biometric Screening" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N13 [label="Threat Assessment" color="#4DB6AC" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N14 [label="Military Counterterrorism" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Information Sharing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Chemical Biological Radiological Nuclear Defense" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+		nest0_1 [label="Psychological Operations" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest0_2 [label="Law Enforcement Operations" color="#BCB88A" fillcolor="#F5F5DC" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Cybersecurity Defense" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Drone Countermeasures" color="#BCB88A" fillcolor="#F5F5DC" shape=parallelogram style=filled]
+		nest1_1 [label="International Cooperation" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_2 [label="Bomb Disposal" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=analyzes color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S0 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [label=propaganda_counters color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N1 -> S2 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N5 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_342.txt b/test/graphviz/scanned_hard/graphviz_342.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7d8ee2f25d5a0d0755f0627e983862003f61c85e
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_342.txt
@@ -0,0 +1,40 @@
+<Airport Security, connectedTo, Legislation and Policy Development>
+<Biometric Screening, connectedTo, Threat Assessment>
+<Bomb Disposal, connectedTo, Threat Assessment>
+<Bomb Disposal, partOf, Bomb Disposal>
+<Border Security, connectedTo, Hostage Negotiation>
+<Chemical Biological Radiological Nuclear Defense, connectedTo, Psychological Operations>
+<Chemical Biological Radiological Nuclear Defense, partOf, Chemical Biological Radiological Nuclear Defense>
+<Counter_Propaganda, analyzes, Border Security>
+<Counter_Propaganda, connectedTo, Hostage Negotiation>
+<Drone Countermeasures, connectedTo, International Cooperation>
+<Drone Countermeasures, partOf, Drone Countermeasures>
+<Forensic Investigation of Attacks, connectedTo, Risk Analysis>
+<Fusion Center Operations, connectedTo, Biometric Screening>
+<Fusion Center Operations, connectedTo, Counter_Propaganda>
+<Fusion Center Operations, connectedTo, Training Exercises>
+<Fusion Center Operations, propaganda_counters, Military Counterterrorism>
+<Hostage Negotiation, connectedTo, Airport Security>
+<Insider Threat Programs, connectedTo, Counter_Propaganda>
+<Insider Threat Programs, connectedTo, Hostage Negotiation>
+<Insider Threat Programs, connectedTo, Port Security>
+<International Cooperation, connectedTo, Bomb Disposal>
+<International Cooperation, partOf, International Cooperation>
+<Law Enforcement Operations, connectedTo, Military Counterterrorism>
+<Law Enforcement Operations, partOf, Law Enforcement Operations>
+<Legislation and Policy Development, connectedTo, Chemical Biological Radiological Nuclear Defense>
+<Legislation and Policy Development, connectedTo, Drone Countermeasures>
+<Legislation and Policy Development, connectedTo, Training Exercises>
+<Port Security, connectedTo, Counter_Propaganda>
+<Port Security, connectedTo, Fusion Center Operations>
+<Port Security, connectedTo, Hostage Negotiation>
+<Port Security, connectedTo, Risk Analysis>
+<Port Security, connectedTo, Risk_Based Security Measures>
+<Psychological Operations, connectedTo, Law Enforcement Operations>
+<Psychological Operations, partOf, Psychological Operations>
+<Risk Analysis, connectedTo, Biometric Screening>
+<Risk Analysis, connectedTo, Military Counterterrorism>
+<Risk Analysis, connectedTo, Threat Assessment>
+<Risk_Based Security Measures, connectedTo, Forensic Investigation of Attacks>
+<Threat Assessment, connectedTo, Military Counterterrorism>
+<Training Exercises, connectedTo, Risk_Based Security Measures>
diff --git a/test/graphviz/scanned_hard/graphviz_343.txt b/test/graphviz/scanned_hard/graphviz_343.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5f3df515255c37f84efbb2a7198c7a528455beb7
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_343.txt
@@ -0,0 +1,43 @@
+<Access Control Systems, connectedTo, Cyber Surveillance>
+<Access Control Systems, connectedTo, Ethical Guidelines>
+<Access Control Systems, connectedTo, GPS Tracking>
+<Anomaly Detection, connectedTo, Internet Traffic Monitoring>
+<Asset Tracking, connectedTo, Environmental Monitoring>
+<Asset Tracking, connectedTo, Legal Compliance>
+<Audio Surveillance, connectedTo, CCTV Monitoring>
+<Audio Surveillance, partOf, Audio Surveillance>
+<Biometric Data Analysis, connectedTo, Data Collection>
+<Border Surveillance, connectedTo, Asset Tracking>
+<Border Surveillance, connectedTo, Internet Traffic Monitoring>
+<CCTV Monitoring, automates, Internet Traffic Monitoring>
+<CCTV Monitoring, partOf, CCTV Monitoring>
+<Cyber Surveillance, connectedTo, Ethical Guidelines>
+<Data Collection, searches, Anomaly Detection>
+<Data Storage and Retention, connectedTo, Anomaly Detection>
+<Data Storage and Retention, partOf, Data Storage and Retention>
+<Environmental Monitoring, connectedTo, Industrial Surveillance>
+<Ethical Guidelines, connectedTo, GPS Tracking>
+<Facial Recognition Systems, connectedTo, Internet Traffic Monitoring>
+<Facial Recognition Systems, connectedTo, Remote Sensing>
+<GPS Tracking, connectedTo, Traffic Surveillance>
+<Industrial Surveillance, connectedTo, Facial Recognition Systems>
+<Industrial Surveillance, connectedTo, Legal Compliance>
+<Internet Traffic Monitoring, connectedTo, Access Control Systems>
+<Intrusion Detection, connectedTo, Audio Surveillance>
+<Intrusion Detection, connectedTo, Satellite Imaging>
+<Legal Compliance, connectedTo, Biometric Data Analysis>
+<Legal Compliance, secures, Internet Traffic Monitoring>
+<Network Monitoring, connectedTo, Security Personnel Operations>
+<Physical Security Integration, connectedTo, Data Storage and Retention>
+<Physical Security Integration, partOf, Physical Security Integration>
+<Remote Sensing, connectedTo, Intrusion Detection>
+<Satellite Imaging, connectedTo, Physical Security Integration>
+<Satellite Imaging, tracks, Thermal Imaging>
+<Sensor Network Deployment, connectedTo, Ethical Guidelines>
+<Sensor Network Deployment, connectedTo, Security Personnel Operations>
+<Sensor Network Deployment, evidence_gathers, Biometric Data Analysis>
+<Sensor Network Deployment, shares, Legal Compliance>
+<Thermal Imaging, connectedTo, Legal Compliance>
+<Thermal Imaging, connectedTo, Sensor Network Deployment>
+<Thermal Imaging, maintains, Internet Traffic Monitoring>
+<Traffic Surveillance, analyzes, Network Monitoring>
diff --git a/test/graphviz/scanned_hard/graphviz_344.dot b/test/graphviz/scanned_hard/graphviz_344.dot
new file mode 100644
index 0000000000000000000000000000000000000000..df79158e1aca5ad977e29fc4ecacff0a446edb8b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_344.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=TD
+	N0 [label="Data Sharing Initiatives" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N1 [label="Mediation Services" color="#607D8B" fillcolor="#CFD8DC" shape=folder style=filled]
+	N2 [label="Policy Development for Prevention" color="#42A5F5" fillcolor="#F1F8FF" shape=parallelogram style=filled]
+	N3 [label="Community Policing" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N4 [label="Technology for Prevention" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N5 [label="Gun Violence Prevention" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N6 [label="Fraud Prevention" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N7 [label="CCTV Installation" color="#42A5F5" fillcolor="#F1F8FF" shape=oval style=filled]
+	N8 [label="Behavioral Science in Prevention" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N9 [label="Patrol Operations" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N10 [label="Gang Intervention" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N11 [label="Drug Prevention Initiatives" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	S0 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#D2D2D2" fillcolor="#F0F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Youth Programs" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Robbery Prevention" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+		nest0_1 [label="Domestic Violence Prevention" color="#42A5F5" fillcolor="#F1F8FF" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Environmental Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Conflict Resolution Training" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+		nest1_1 [label="Neighborhood Watch Programs" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+		nest1_2 [label="Vehicle Theft Prevention" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+		nest1_3 [label="Police_Community Relations" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=communicates color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=licenses color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [label=alerts color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N7 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S2 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label=certifies color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_345.dot b/test/graphviz/scanned_hard/graphviz_345.dot
new file mode 100644
index 0000000000000000000000000000000000000000..43a01f16009c9fe982c1c8df051c512e7c16c545
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_345.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=TD
+	N0 [label="Invasive Species Control" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N1 [label="Ecosystem Services Valuation" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N2 [label="Freshwater Conservation" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N3 [label="Grassland Conservation" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N4 [label="Climate Change Adaptation for Wildlife" color="#FFC107" fillcolor="#FFECB3" shape=oval style=filled]
+	N5 [label="Disease Surveillance" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N6 [label="International Treaties Enforcement" color="#FFC107" fillcolor="#FFECB3" shape=plaintext style=filled]
+	N7 [label="Captive Breeding Programs" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N8 [label="Drone_based Monitoring" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N9 [label="Camera Trap Deployment" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N10 [label="Carbon Sequestration in Habitats" color="#F44336" fillcolor="#FFCDD2" shape=oval style=filled]
+	N11 [label="Data Management for Conservation" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N12 [label="Ecological Survey" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	S0 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Anti_Poaching Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Satellite Tracking of Animals" color="#FFC107" fillcolor="#FFECB3" shape=Mdiamond style=filled]
+		nest0_1 [label="GIS Mapping for Habitats" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Ecotourism Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Population Dynamics Study" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+		nest1_1 [label="Conservation Education" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=alerts color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N10 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N4 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N12 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [label=habitats_preserves color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_345.txt b/test/graphviz/scanned_hard/graphviz_345.txt
new file mode 100644
index 0000000000000000000000000000000000000000..de0261a6b7638b6bed25fd6b0a104a1526a323c2
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_345.txt
@@ -0,0 +1,35 @@
+<Camera Trap Deployment, connectedTo, Carbon Sequestration in Habitats>
+<Captive Breeding Programs, connectedTo, Drone_based Monitoring>
+<Captive Breeding Programs, connectedTo, Satellite Tracking of Animals>
+<Carbon Sequestration in Habitats, connectedTo, Data Management for Conservation>
+<Climate Change Adaptation for Wildlife, connectedTo, Disease Surveillance>
+<Climate Change Adaptation for Wildlife, connectedTo, Ecological Survey>
+<Conservation Education, connectedTo, Climate Change Adaptation for Wildlife>
+<Conservation Education, partOf, Conservation Education>
+<Data Management for Conservation, connectedTo, Ecological Survey>
+<Disease Surveillance, connectedTo, International Treaties Enforcement>
+<Drone_based Monitoring, connectedTo, Camera Trap Deployment>
+<Drone_based Monitoring, connectedTo, Carbon Sequestration in Habitats>
+<Drone_based Monitoring, connectedTo, Data Management for Conservation>
+<Ecosystem Services Valuation, connectedTo, Camera Trap Deployment>
+<Ecosystem Services Valuation, connectedTo, Drone_based Monitoring>
+<Ecosystem Services Valuation, connectedTo, Freshwater Conservation>
+<Freshwater Conservation, connectedTo, Camera Trap Deployment>
+<Freshwater Conservation, connectedTo, Climate Change Adaptation for Wildlife>
+<Freshwater Conservation, connectedTo, Ecological Survey>
+<Freshwater Conservation, connectedTo, Grassland Conservation>
+<Freshwater Conservation, connectedTo, Population Dynamics Study>
+<Freshwater Conservation, habitats_preserves, Drone_based Monitoring>
+<GIS Mapping for Habitats, connectedTo, Carbon Sequestration in Habitats>
+<GIS Mapping for Habitats, partOf, GIS Mapping for Habitats>
+<Grassland Conservation, connectedTo, Camera Trap Deployment>
+<Grassland Conservation, connectedTo, Climate Change Adaptation for Wildlife>
+<Grassland Conservation, connectedTo, Ecological Survey>
+<International Treaties Enforcement, connectedTo, Captive Breeding Programs>
+<International Treaties Enforcement, connectedTo, Drone_based Monitoring>
+<Invasive Species Control, alerts, Ecosystem Services Valuation>
+<Invasive Species Control, connectedTo, Camera Trap Deployment>
+<Population Dynamics Study, connectedTo, Conservation Education>
+<Population Dynamics Study, partOf, Population Dynamics Study>
+<Satellite Tracking of Animals, connectedTo, GIS Mapping for Habitats>
+<Satellite Tracking of Animals, partOf, Satellite Tracking of Animals>
diff --git a/test/graphviz/scanned_hard/graphviz_346.dot b/test/graphviz/scanned_hard/graphviz_346.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d99a09fc6e4839afcf44ffae90ee88051ed2a343
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_346.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=BT
+	N0 [label="Salinity Measurement" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label="Marine Pollution Monitoring" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N2 [label="Underwater Acoustics" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N3 [label="Marine Biodiversity Assessment" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N4 [label="Ocean Carbon Cycle" color="#FFB2A5" fillcolor="#FFDCD6" shape=oval style=filled]
+	N5 [label="Sediment Analysis" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N6 [label="Biological Oceanography" color="#26A69A" fillcolor="#E0F2F1" shape=octagon style=filled]
+	N7 [label="Sea Level Monitoring" color="#26A69A" fillcolor="#E0F2F1" shape=octagon style=filled]
+	N8 [label="Fisheries Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=Mdiamond style=filled]
+	N9 [label="Tsunami Prediction" color="#26A69A" fillcolor="#E0F2F1" shape=diamond style=filled]
+	N10 [label="Physical Oceanography" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N11 [label="Climate Change Impact Study" color="#26A69A" fillcolor="#E0F2F1" shape=diamond style=filled]
+	N12 [label="Seabed Resource Exploration" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N13 [label="Ocean Floor Mapping" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N14 [label="Ocean Drilling Programs" color="#26A69A" fillcolor="#E0F2F1" shape=diamond style=filled]
+	N15 [label="Polar Oceanography" color="#26A69A" fillcolor="#E0F2F1" shape=plaintext style=filled]
+	N16 [label="Marine Hazards Assessment" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N17 [label="Ocean Modeling" color="#FFC2C2" fillcolor="#FFEBEB" shape=diamond style=filled]
+	N18 [label="Ocean Data Archiving" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N19 [label="Chemical Oceanography" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	S0 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Ocean Temperature Sensing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Marine Ecosystem Health" color="#FFC2C2" fillcolor="#FFEBEB" shape=plaintext style=filled]
+		nest0_1 [label="Buoy Deployment" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Marine Protected Area Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Ocean Renewable Energy" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_1 [label="Deep_Sea Exploration" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [label=simulates color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N19 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N17 -> nest0_0 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N16 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N14 -> nest1_0 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N19 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [label=processes_images color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N1 -> S2 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	S2 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_348.dot b/test/graphviz/scanned_hard/graphviz_348.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8d74ae6e3fe3ec182c4cb5a8143069842bb70ae8
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_348.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=RL
+	N0 [label="Genetic Testing" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Genetic Counseling" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N2 [label="Functional Genomics" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N3 [label="Long_Read Sequencing" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+	N4 [label=Metabolomics color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+	N5 [label="Disease Gene Identification" color="#A188D0" fillcolor="#DACBE3" shape=oval style=filled]
+	N6 [label=Transcriptomics color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N7 [label="DNA Sequencing" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+	N8 [label="Variant Calling" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N9 [label=Epigenomics color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+	N10 [label="Gene Therapy Development" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N11 [label="Single_Cell Genomics" color="#388E3C" fillcolor="#C8E6C9" shape=plaintext style=filled]
+	N12 [label="CRISPR Gene Drive Research" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+	N13 [label="Genomic Data Visualization" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N14 [label="Synthetic Genomics" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N15 [label="Rare Disease Genomics" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N16 [label="Genome_Wide Association Studies" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+	N17 [label=Pharmacogenomics color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Bioinformatics Pipeline Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Computational Genomics" color="#FFCC80" fillcolor="#FFF0CC" shape=diamond style=filled]
+		nest0_1 [label="Spatial Genomics" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Gene Annotation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Cancer Genomics" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+		nest1_1 [label="Comparative Genomics" color="#FFCC80" fillcolor="#FFF0CC" shape=diamond style=filled]
+		nest1_2 [label="Population Genomics" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=processes_data color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=genomes_researches color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N14 -> nest0_0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N15 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [label=publishes color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N2 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [label=interprets color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [label=tools_creates color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N8 -> S2 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	S2 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S2 -> N15 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [label=edits color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_348.txt b/test/graphviz/scanned_hard/graphviz_348.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5157bd55d6530667afc97f8ff024355f0c723744
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_348.txt
@@ -0,0 +1,41 @@
+<CRISPR Gene Drive Research, connectedTo, Genome_Wide Association Studies>
+<CRISPR Gene Drive Research, connectedTo, Genomic Data Visualization>
+<CRISPR Gene Drive Research, connectedTo, Pharmacogenomics>
+<CRISPR Gene Drive Research, connectedTo, Synthetic Genomics>
+<CRISPR Gene Drive Research, tools_creates, Rare Disease Genomics>
+<Cancer Genomics, connectedTo, Comparative Genomics>
+<Cancer Genomics, partOf, Cancer Genomics>
+<Comparative Genomics, connectedTo, Population Genomics>
+<Comparative Genomics, partOf, Comparative Genomics>
+<Computational Genomics, connectedTo, Spatial Genomics>
+<Computational Genomics, partOf, Computational Genomics>
+<DNA Sequencing, connectedTo, Variant Calling>
+<Disease Gene Identification, connectedTo, Transcriptomics>
+<Epigenomics, connectedTo, Gene Therapy Development>
+<Functional Genomics, connectedTo, Epigenomics>
+<Functional Genomics, connectedTo, Long_Read Sequencing>
+<Gene Therapy Development, connectedTo, Single_Cell Genomics>
+<Genetic Counseling, connectedTo, Transcriptomics>
+<Genetic Counseling, interprets, Long_Read Sequencing>
+<Genetic Counseling, processes_data, Functional Genomics>
+<Genetic Testing, connectedTo, Genetic Counseling>
+<Genome_Wide Association Studies, connectedTo, Pharmacogenomics>
+<Genomic Data Visualization, connectedTo, Synthetic Genomics>
+<Long_Read Sequencing, connectedTo, Metabolomics>
+<Long_Read Sequencing, publishes, Cancer Genomics>
+<Metabolomics, connectedTo, Disease Gene Identification>
+<Metabolomics, connectedTo, Epigenomics>
+<Population Genomics, connectedTo, Functional Genomics>
+<Population Genomics, partOf, Population Genomics>
+<Rare Disease Genomics, connectedTo, Genome_Wide Association Studies>
+<Single_Cell Genomics, connectedTo, CRISPR Gene Drive Research>
+<Spatial Genomics, connectedTo, Rare Disease Genomics>
+<Spatial Genomics, partOf, Spatial Genomics>
+<Synthetic Genomics, connectedTo, Computational Genomics>
+<Synthetic Genomics, connectedTo, Rare Disease Genomics>
+<Transcriptomics, connectedTo, DNA Sequencing>
+<Transcriptomics, edits, Epigenomics>
+<Variant Calling, connectedTo, Pharmacogenomics>
+<Variant Calling, connectedTo, Rare Disease Genomics>
+<Variant Calling, connectedTo, Synthetic Genomics>
+<Variant Calling, genomes_researches, Epigenomics>
diff --git a/test/graphviz/scanned_hard/graphviz_349.dot b/test/graphviz/scanned_hard/graphviz_349.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9f608aa91825fd278162561a0c9734c417178f0b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_349.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=RL
+	N0 [label="Voice Assistant Development" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N1 [label="Prosody Analysis" color="#73C6BC" fillcolor="#D0EFEE" shape=parallelogram style=filled]
+	N2 [label="Multimodal Speech Processing" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N3 [label="Language Modeling" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+	N4 [label="Voice Search Optimization" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N5 [label="Speaker Identification" color="#73C6BC" fillcolor="#D0EFEE" shape=parallelogram style=filled]
+	N6 [label="Acoustic Modeling" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N7 [label="Security Authentication" color="#FFF176" fillcolor="#FFFDE7" shape=oval style=filled]
+	N8 [label="Linguistic Analysis" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N9 [label="Keyword Spotting" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Children's Speech Recognition" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Voice Activity Detection" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+		nest0_1 [label="Automatic Speech Recognition" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [label=personalizes color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Speech Emotion Recognition" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Speaker Diarization" color="#73C6BC" fillcolor="#D0EFEE" shape=plaintext style=filled]
+		nest1_1 [label="Meeting Transcription" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest1_2 [label="Real_Time Captioning" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=transcribes color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [label=recognizes color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N2 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [label=integrates color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [label=updates color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_349.txt b/test/graphviz/scanned_hard/graphviz_349.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4582b3b6e3db6a7eecb5af31f963186d8800b9db
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_349.txt
@@ -0,0 +1,33 @@
+<Acoustic Modeling, connectedTo, Security Authentication>
+<Automatic Speech Recognition, connectedTo, Multimodal Speech Processing>
+<Automatic Speech Recognition, partOf, Automatic Speech Recognition>
+<Language Modeling, connectedTo, Linguistic Analysis>
+<Language Modeling, connectedTo, Security Authentication>
+<Language Modeling, connectedTo, Speaker Identification>
+<Language Modeling, connectedTo, Voice Search Optimization>
+<Language Modeling, integrates, Keyword Spotting>
+<Linguistic Analysis, connectedTo, Keyword Spotting>
+<Meeting Transcription, partOf, Meeting Transcription>
+<Meeting Transcription, transcribes, Real_Time Captioning>
+<Multimodal Speech Processing, connectedTo, Keyword Spotting>
+<Multimodal Speech Processing, connectedTo, Language Modeling>
+<Multimodal Speech Processing, connectedTo, Linguistic Analysis>
+<Multimodal Speech Processing, connectedTo, Security Authentication>
+<Multimodal Speech Processing, connectedTo, Speaker Identification>
+<Multimodal Speech Processing, updates, Voice Search Optimization>
+<Prosody Analysis, connectedTo, Multimodal Speech Processing>
+<Prosody Analysis, connectedTo, Voice Search Optimization>
+<Prosody Analysis, recognizes, Voice Activity Detection>
+<Real_Time Captioning, connectedTo, Multimodal Speech Processing>
+<Real_Time Captioning, partOf, Real_Time Captioning>
+<Security Authentication, connectedTo, Linguistic Analysis>
+<Speaker Diarization, connectedTo, Meeting Transcription>
+<Speaker Diarization, partOf, Speaker Diarization>
+<Speaker Identification, connectedTo, Acoustic Modeling>
+<Voice Activity Detection, partOf, Voice Activity Detection>
+<Voice Activity Detection, personalizes, Automatic Speech Recognition>
+<Voice Assistant Development, connectedTo, Linguistic Analysis>
+<Voice Assistant Development, connectedTo, Prosody Analysis>
+<Voice Assistant Development, connectedTo, Voice Search Optimization>
+<Voice Search Optimization, connectedTo, Speaker Diarization>
+<Voice Search Optimization, connectedTo, Speaker Identification>
diff --git a/test/graphviz/scanned_hard/graphviz_35.dot b/test/graphviz/scanned_hard/graphviz_35.dot
new file mode 100644
index 0000000000000000000000000000000000000000..34a0b580dea5a209f56106a9a1ea2145f13d1f02
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_35.dot
@@ -0,0 +1,28 @@
+digraph {
+	rankdir=TD
+	N0 [label="Customer Loyalty Program Support" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N1 [label="Self_Service Portal Management" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N2 [label="Email Support" color="#795548" fillcolor="#D7CCC8" shape=oval style=filled]
+	N3 [label="Inquiry Handling" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N4 [label="Technical Support" color="#FFC107" fillcolor="#FFECB3" shape=folder style=filled]
+	N5 [label="Customer Journey Mapping" color="#7986CB" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N6 [label="Feedback Loop to Product Development" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N7 [label="FAQ Management" color="#FFC107" fillcolor="#FFECB3" shape=folder style=filled]
+	N8 [label="Feedback Collection" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N9 [label="Post_Service Follow_up" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N10 [label="Multilingual Support" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N11 [label="Live Chat Support" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N0 -> N1 [label=listens color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=answers color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=responds color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=educates color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=videos color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=secures color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=emails color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N4 [label=refunds color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N1 [label=feedback color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_350.txt b/test/graphviz/scanned_hard/graphviz_350.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7b5e706e08dbaa710f4e684a840dc4483ab57bbf
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_350.txt
@@ -0,0 +1,42 @@
+<Author Attribution, connectedTo, Spam Detection>
+<Author Attribution, partOf, Author Attribution>
+<Automated Content Tagging, connectedTo, Keyword Extraction>
+<Automated Content Tagging, connectedTo, Vector Space Models>
+<Document Summarization, data_collects, Tokenization>
+<Document Summarization, partOf, Document Summarization>
+<Financial Text Analysis, connectedTo, Machine Learning for Text Mining>
+<Keyword Extraction, connectedTo, Text Clustering>
+<Keyword Extraction, connectedTo, Text Visualization>
+<Keyword Extraction, connectedTo, Vector Space Models>
+<Language Translation for Text Mining, connectedTo, Text Classification>
+<Legal Document Analysis, blocks, Author Attribution>
+<Legal Document Analysis, connectedTo, News Article Analysis>
+<Legal Document Analysis, connectedTo, Plagiarism Detection>
+<Lemmatization or Stemming, connectedTo, Financial Text Analysis>
+<Lemmatization or Stemming, connectedTo, Text Clustering>
+<Lemmatization or Stemming, connectedTo, Text Preprocessing>
+<Lemmatization or Stemming, connectedTo, Vector Space Models>
+<Machine Learning for Text Mining, disambiguates, Automated Content Tagging>
+<Named Entity Recognition, connectedTo, Language Translation for Text Mining>
+<Named Entity Recognition, connectedTo, Text Preprocessing>
+<Natural Language Processing, connectedTo, Vector Space Models>
+<Natural Language Processing, partOf, Natural Language Processing>
+<News Article Analysis, connectedTo, Vector Space Models>
+<Plagiarism Detection, connectedTo, Natural Language Processing>
+<Plagiarism Detection, partOf, Plagiarism Detection>
+<Spam Detection, connectedTo, Document Summarization>
+<Spam Detection, partOf, Spam Detection>
+<Text Classification, connectedTo, Knowledge Graph Construction>
+<Text Classification, connectedTo, Legal Document Analysis>
+<Text Classification, connectedTo, News Article Analysis>
+<Text Classification, connectedTo, Text Preprocessing>
+<Text Clustering, connectedTo, Named Entity Recognition>
+<Text Preprocessing, connectedTo, Knowledge Graph Construction>
+<Text Preprocessing, connectedTo, Legal Document Analysis>
+<Text Preprocessing, connectedTo, News Article Analysis>
+<Text Preprocessing, interprets, Vector Space Models>
+<Text Visualization, connectedTo, Text Clustering>
+<Text Visualization, connectedTo, Text Preprocessing>
+<Tokenization, connectedTo, Text Classification>
+<Tokenization, partOf, Tokenization>
+<Vector Space Models, connectedTo, Knowledge Graph Construction>
diff --git a/test/graphviz/scanned_hard/graphviz_351.dot b/test/graphviz/scanned_hard/graphviz_351.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ad02aabbb9279fac96eed301a4648ceb814aee12
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_351.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=RL
+	N0 [label="Virtual Reality Interaction" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N1 [label="Scalability of Models" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N2 [label="Simulation and Prediction" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N3 [label="Interoperability Standards" color="#E91E63" fillcolor="#F8BBD0" shape=diamond style=filled]
+	N4 [label="Lifecycle Management" color="#00BCD4" fillcolor="#E0F7FA" shape=plaintext style=filled]
+	N5 [label="Model Creation" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N6 [label="Cyber_Physical Systems" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N7 [label="System Integration Architecture" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+	N8 [label="Performance Monitoring" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N9 [label="Healthcare Digital Twins" color="#E91E63" fillcolor="#F8BBD0" shape=folder style=filled]
+	N10 [label="Edge Computing for Twins" color="#00BCD4" fillcolor="#E0F7FA" shape=diamond style=filled]
+	N11 [label="Aerospace Digital Twins" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+	N12 [label="Historical Data Analysis" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N13 [label="Remote Control Capabilities" color="#E91E63" fillcolor="#F8BBD0" shape=oval style=filled]
+	N14 [label="Autonomous Operations" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N15 [label="Operational Planning" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Risk Assessment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Energy Consumption Optimization" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+		nest0_1 [label="IoT Data Ingestion" color="#E91E63" fillcolor="#F8BBD0" shape=plaintext style=filled]
+		nest0_2 [label="Predictive Maintenance" color="#00BCD4" fillcolor="#E0F7FA" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Automotive Digital Twins" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Asset Optimization" color="#E91E63" fillcolor="#F8BBD0" shape=oval style=filled]
+		nest1_1 [label="Condition Monitoring" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+		nest1_2 [label="Augmented Reality Visualization" color="#CB9BE1" fillcolor="#F2E6F5" shape=folder style=filled]
+		nest1_3 [label="What_If Scenario Analysis" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=sensors_connects color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N12 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N10 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [label=monitors color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N11 -> M0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N13 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N11 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N13 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_352.dot b/test/graphviz/scanned_hard/graphviz_352.dot
new file mode 100644
index 0000000000000000000000000000000000000000..795e94c883475bcd7923fabd5c4882e183dd1c92
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_352.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=RL
+	N0 [label="Robotic Process Automation Implementation" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N1 [label="Customer Service Automation" color="#FFCC80" fillcolor="#FFF0CC" shape=oval style=filled]
+	N2 [label="Compliance in Automation" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N3 [label="Automation Opportunity Identification" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N4 [label="Optical Character Recognition for Automation" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N5 [label="Document Processing Automation" color="#CDDC39" fillcolor="#E6EE9C" shape=oval style=filled]
+	N6 [label="Report Generation Automation" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N7 [label="Workflow Automation Platforms" color="#FFCC80" fillcolor="#FFF0CC" shape=octagon style=filled]
+	N8 [label="Error Handling in Automation" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N9 [label="Security for Automation Bots" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+	N10 [label="Low_Code or No_Code Automation" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+	N11 [label="Process Mining" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	S0 [label="" color="#F06292" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Finance Process Automation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Workflow Analysis" color="#F06292" fillcolor="#FCE4EC" shape=folder style=filled]
+		nest0_1 [label="Scripting for Automation" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+		nest0_2 [label="Automated Data Validation" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="API Automation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Integration with Existing Systems" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+		nest1_1 [label="IT Operations Automation" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+		nest1_2 [label=Hyperautomation color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest1_3 [label="Automated Testing" color="#F06292" fillcolor="#FCE4EC" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N1 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label=remedies_applies color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N4 -> M2 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	M2 -> N7 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_354.txt b/test/graphviz/scanned_hard/graphviz_354.txt
new file mode 100644
index 0000000000000000000000000000000000000000..df5bedc148c3ae5952b491718d857668a55a7f46
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_354.txt
@@ -0,0 +1,34 @@
+<Asset Management, connectedTo, Performance Optimization>
+<Asset Management, partOf, Asset Management>
+<Business Intelligence Integration, connectedTo, Project Management>
+<Business Intelligence Integration, migrates, Supply Chain Management>
+<Business Intelligence Integration, upgrades, User Access Management>
+<Business Process Re_engineering, connectedTo, Integration with Other Systems>
+<Business Process Re_engineering, connectedTo, Project Management>
+<Business Process Re_engineering, connectedTo, User Access Management>
+<Business Process Re_engineering, connectedTo, Vendor Management>
+<Cloud ERP Deployment, connectedTo, ERP System Selection>
+<Cloud ERP Deployment, connectedTo, Security Management>
+<Data Migration, connectedTo, Security Management>
+<ERP Consulting, connectedTo, System Configuration>
+<ERP Consulting, partOf, ERP Consulting>
+<ERP System Selection, connectedTo, Data Migration>
+<ERP System Selection, connectedTo, Security Management>
+<Human Capital Management, dashboards_generates, Business Intelligence Integration>
+<Hybrid ERP Models, connectedTo, Business Process Re_engineering>
+<Integration with Other Systems, connectedTo, Asset Management>
+<Integration with Other Systems, partOf, Integration with Other Systems>
+<Performance Optimization, connectedTo, Business Intelligence Integration>
+<Performance Optimization, partOf, Performance Optimization>
+<Security Management, connectedTo, Business Process Re_engineering>
+<Security Management, connectedTo, ERP Consulting>
+<Security Management, connectedTo, User Access Management>
+<Security Management, connectedTo, User Training>
+<Supply Chain Management, connectedTo, User Access Management>
+<System Configuration, connectedTo, Workflow Automation in ERP>
+<System Configuration, partOf, System Configuration>
+<User Access Management, manufacturing_manages, Project Management>
+<User Training, connectedTo, Hybrid ERP Models>
+<Vendor Management, connectedTo, Human Capital Management>
+<Workflow Automation in ERP, connectedTo, Business Intelligence Integration>
+<Workflow Automation in ERP, partOf, Workflow Automation in ERP>
diff --git a/test/graphviz/scanned_hard/graphviz_356.txt b/test/graphviz/scanned_hard/graphviz_356.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3c3cf032e8fa31440ab7a73adeb4d30e4624eec2
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_356.txt
@@ -0,0 +1,39 @@
+<Anti_Cheat Measures, connectedTo, Nutrition for Esports Athletes>
+<Anti_Cheat Measures, partOf, Anti_Cheat Measures>
+<Audience Engagement, connectedTo, Network Infrastructure for Tournaments>
+<Data Security for Competitions, connectedTo, Event Broadcasting>
+<Data Security for Competitions, connectedTo, Sponsorship Acquisition>
+<Esports Analytics, connectedTo, Rules and Regulations Enforcement>
+<Esports Education Programs, connectedTo, Gaming Hardware Optimization>
+<Esports Team Ownership, connectedTo, Esports Analytics>
+<Esports Team Ownership, connectedTo, Event Broadcasting>
+<Esports Team Ownership, connectedTo, Fan Community Building>
+<Esports Team Ownership, connectedTo, Rules and Regulations Enforcement>
+<Fan Community Building, connectedTo, Data Security for Competitions>
+<Gaming Hardware Optimization, connectedTo, Player Wellness Programs>
+<Merchandise Sales, connectedTo, Ticketing Sales>
+<Merchandise Sales, partOf, Merchandise Sales>
+<Network Infrastructure for Tournaments, connectedTo, Data Security for Competitions>
+<Network Infrastructure for Tournaments, connectedTo, Esports Team Ownership>
+<Network Infrastructure for Tournaments, connectedTo, Rules and Regulations Enforcement>
+<Network Infrastructure for Tournaments, connectedTo, Team Management>
+<Nutrition for Esports Athletes, connectedTo, Physical Conditioning for Players>
+<Nutrition for Esports Athletes, partOf, Nutrition for Esports Athletes>
+<Physical Conditioning for Players, connectedTo, Social Media Management>
+<Physical Conditioning for Players, partOf, Physical Conditioning for Players>
+<Player Wellness Programs, connectedTo, Audience Engagement>
+<Prize Pool Management, connectedTo, Social Media Management>
+<Prize Pool Management, integrity_ensures, Esports Education Programs>
+<Rules and Regulations Enforcement, connectedTo, Anti_Cheat Measures>
+<Rules and Regulations Enforcement, connectedTo, Team Management>
+<Social Media Management, connectedTo, Audience Engagement>
+<Social Media Management, partOf, Social Media Management>
+<Sponsorship Acquisition, connectedTo, Merchandise Sales>
+<Sponsorship Acquisition, partOf, Sponsorship Acquisition>
+<Talent Representation, connectedTo, Data Security for Competitions>
+<Talent Representation, connectedTo, Fan Community Building>
+<Team Management, connectedTo, Talent Representation>
+<Ticketing Sales, connectedTo, Training Regimen>
+<Ticketing Sales, partOf, Ticketing Sales>
+<Training Regimen, connectedTo, Esports Team Ownership>
+<Training Regimen, partOf, Training Regimen>
diff --git a/test/graphviz/scanned_hard/graphviz_358.txt b/test/graphviz/scanned_hard/graphviz_358.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e01088a10533e64a298d2e40cb8b28de7da51c4e
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_358.txt
@@ -0,0 +1,35 @@
+<3D Scanning of Artifacts, connectedTo, Indigenous Cultural Heritage Rights>
+<3D Scanning of Artifacts, partOf, 3D Scanning of Artifacts>
+<Archival Management, connectedTo, Restoration Techniques>
+<Archival Management, connectedTo, Underwater Cultural Heritage>
+<Artifact Conservation, protects, Conservation Science>
+<Climate Change Impact on Heritage, connectedTo, Crowdsourcing for Heritage Data>
+<Climate Change Impact on Heritage, partOf, Climate Change Impact on Heritage>
+<Conservation Science, connectedTo, Crowdsourcing for Heritage Data>
+<Digital Documentation, connectedTo, GIS Mapping for Heritage Sites>
+<GIS Mapping for Heritage Sites, connectedTo, Illicit Trafficking Control>
+<Heritage Impact Assessment, connectedTo, Sustainable Heritage Management>
+<Heritage Impact Assessment, partOf, Heritage Impact Assessment>
+<Heritage Site Management, analyzes_data, Oral History Collection>
+<Heritage Site Management, connectedTo, Museum Collection Management>
+<Illicit Trafficking Control, connectedTo, Heritage Site Management>
+<Indigenous Cultural Heritage Rights, connectedTo, Climate Change Impact on Heritage>
+<Indigenous Cultural Heritage Rights, partOf, Indigenous Cultural Heritage Rights>
+<Legal Protection for Heritage, connectedTo, Digital Documentation>
+<Legal Protection for Heritage, partOf, Legal Protection for Heritage>
+<Museum Collection Management, connectedTo, 3D Scanning of Artifacts>
+<Museum Collection Management, connectedTo, Traditional Knowledge Documentation>
+<Museum Collection Management, partOf, Museum Collection Management>
+<Oral History Collection, buildings_maintains, Conservation Science>
+<Oral History Collection, connectedTo, Artifact Conservation>
+<Oral History Collection, connectedTo, Crowdsourcing for Heritage Data>
+<Photogrammetry for Documentation, connectedTo, Archival Management>
+<Photogrammetry for Documentation, connectedTo, Restoration Techniques>
+<Restoration Techniques, connectedTo, Digital Documentation>
+<Sustainable Heritage Management, connectedTo, Legal Protection for Heritage>
+<Sustainable Heritage Management, partOf, Sustainable Heritage Management>
+<Traditional Knowledge Documentation, connectedTo, Oral History Collection>
+<Traditional Knowledge Documentation, connectedTo, Restoration Techniques>
+<Traditional Knowledge Documentation, traditions_sustains, Photogrammetry for Documentation>
+<Underwater Cultural Heritage, connectedTo, Heritage Impact Assessment>
+<Underwater Cultural Heritage, partOf, Underwater Cultural Heritage>
diff --git a/test/graphviz/scanned_hard/graphviz_36.dot b/test/graphviz/scanned_hard/graphviz_36.dot
new file mode 100644
index 0000000000000000000000000000000000000000..105897886051fad593fe4fbccc44a1f7601fdb9b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_36.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=RL
+	N0 [label="Collaborative Planning" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N1 [label="Sustainability Initiatives" color="#607D8B" fillcolor="#CFD8DC" shape=parallelogram style=filled]
+	N2 [label="Material Flow Management" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N3 [label="Production Scheduling Integration" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N4 [label="Data Analytics for Supply Chain" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N5 [label="Last_Mile Delivery Optimization" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+	N6 [label="Container Tracking" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N7 [label="Supplier Relationship Management" color="#FFCC80" fillcolor="#FFF0CC" shape=diamond style=filled]
+	N8 [label="Resilience Planning" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N9 [label="Inventory Management" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N0 -> N1 [label=transparency color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=analyzes color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=secures color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=procures color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N8 [label=negotiates color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N6 -> N5 [label=certifies color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_37.dot b/test/graphviz/scanned_hard/graphviz_37.dot
new file mode 100644
index 0000000000000000000000000000000000000000..71159207c125e0b530411a7b901eed41eb577c2d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_37.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=TD
+	N0 [label=Exploration color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N1 [label="Energy Management" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N2 [label=Reclamation color="#2196F3" fillcolor="#BBDEFB" shape=parallelogram style=filled]
+	N3 [label="Waste Rock Management" color="#2196F3" fillcolor="#BBDEFB" shape=parallelogram style=filled]
+	N4 [label="Drilling and Blasting" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N5 [label="Ore Extraction" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N6 [label="Water Management" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N7 [label="Mine Dewatering" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N0 -> N1 [label=safety color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=maintains color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=refines color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_38.dot b/test/graphviz/scanned_hard/graphviz_38.dot
new file mode 100644
index 0000000000000000000000000000000000000000..60565e661d7d8557fdf823e8e04085ec842de93e
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_38.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=LR
+	N0 [label="Voyage Optimization" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N1 [label="Vessel Chartering" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N2 [label="Fisheries Management" color="#42A5F5" fillcolor="#F1F8FF" shape=plaintext style=filled]
+	N3 [label="Ship Registry" color="#FFC2C2" fillcolor="#FFEBEB" shape=oval style=filled]
+	N4 [label=Navigation color="#90A4AE" fillcolor="#ECEFF1" shape=Mdiamond style=filled]
+	N5 [label="Autonomous Vessels" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N6 [label=Shipbuilding color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N7 [label="Subsea Cable Laying" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N8 [label=Pilotage color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N9 [label="Maritime Law Compliance" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N0 -> N1 [label=analyzes color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=conserves color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=operates color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=protects color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=alerts color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=maintains color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=equipment color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N2 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N4 -> N7 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_39.dot b/test/graphviz/scanned_hard/graphviz_39.dot
new file mode 100644
index 0000000000000000000000000000000000000000..be4325948548d45c7ec589b6ffc1d449fe45309f
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_39.dot
@@ -0,0 +1,27 @@
+digraph {
+	rankdir=RL
+	N0 [label="Asteroid Mining Feasibility" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="New Space Technology Development" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N2 [label="Space Station Operations" color="#FFE470" fillcolor="#FFFAE0" shape=plaintext style=filled]
+	N3 [label="Lunar Exploration" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N4 [label="Space Weather Forecasting" color="#FFE470" fillcolor="#FFFAE0" shape=Mdiamond style=filled]
+	N5 [label="Spacecraft Control" color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N6 [label="Space Tourism Development" color="#673AB7" fillcolor="#D1C4E9" shape=oval style=filled]
+	N7 [label="Extravehicular Activity Planning" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N8 [label="Deep Space Communications" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N9 [label="Microgravity Experiments" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N10 [label="Space Habitat Development" color="#673AB7" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N11 [label="Exoplanet Discovery" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N0 -> N1 [label=calibrates color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=monitors color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=licenses color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=innovates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=receives color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=regulates color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N11 [label=orbits color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_39.txt b/test/graphviz/scanned_hard/graphviz_39.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ca7a9cf10558d63e98cd028341a7c5965c5470be
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_39.txt
@@ -0,0 +1,12 @@
+<Asteroid Mining Feasibility, calibrates, New Space Technology Development>
+<Deep Space Communications, connectedTo, Microgravity Experiments>
+<Extravehicular Activity Planning, regulates, Deep Space Communications>
+<Lunar Exploration, connectedTo, Space Weather Forecasting>
+<Microgravity Experiments, connectedTo, Space Habitat Development>
+<New Space Technology Development, monitors, Space Station Operations>
+<Space Habitat Development, connectedTo, Exoplanet Discovery>
+<Space Station Operations, licenses, Lunar Exploration>
+<Space Tourism Development, receives, Extravehicular Activity Planning>
+<Space Weather Forecasting, connectedTo, Spacecraft Control>
+<Spacecraft Control, innovates, Space Tourism Development>
+<Spacecraft Control, orbits, Exoplanet Discovery>
diff --git a/test/graphviz/scanned_hard/graphviz_4.dot b/test/graphviz/scanned_hard/graphviz_4.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2220f3c9b2605a71c5e0fade53bdbae46d0f7f41
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_4.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=LR
+	N0 [label="Faculty Recruitment" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N1 [label="Library Registration" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N2 [label="Scholarship Evaluation" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N3 [label="Digital Resource Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N4 [label="Transcript Issuance" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N5 [label="Lecture Delivery" color="#92C79A" fillcolor="#E8F0EA" shape=parallelogram style=filled]
+	N6 [label=Orientation color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N7 [label="Study Abroad Program" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N8 [label="Assignment Submission" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=plans color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=coordinates color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=grants color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=trains color="#F06292" dir=forward penwidth=1.5 style=solid]
+	N1 -> N0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_40.dot b/test/graphviz/scanned_hard/graphviz_40.dot
new file mode 100644
index 0000000000000000000000000000000000000000..72223215f1194cd2b67c8b4de3759f75e746fe5b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_40.dot
@@ -0,0 +1,27 @@
+digraph {
+	rankdir=RL
+	N0 [label="Climate Impact Assessment" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N1 [label="Ocean Current Analysis" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N2 [label="Ice Sheet Dynamics" color="#66BB6A" fillcolor="#E8F5E9" shape=plaintext style=filled]
+	N3 [label="Drought Monitoring and Forecasting" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+	N4 [label="Permafrost Thaw Assessment" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N5 [label="Solar Radiation Management Research" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N6 [label="Atmospheric Monitoring" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N7 [label="International Climate Negotiation" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N8 [label="Water Resource Management under Climate Change" color="#66BB6A" fillcolor="#E8F5E9" shape=Mdiamond style=filled]
+	N9 [label="Mitigation Technology Evaluation" color="#C0CA33" fillcolor="#F9FBE7" shape=octagon style=filled]
+	N10 [label="Data Collection" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N11 [label="Climate Modeling" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N0 -> N1 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=policies color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=quantifies color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=educates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=predicts color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=adapts color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N9 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_41.txt b/test/graphviz/scanned_hard/graphviz_41.txt
new file mode 100644
index 0000000000000000000000000000000000000000..46a4bea3838bd35135ab410745d1ba997b2fbacd
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_41.txt
@@ -0,0 +1,12 @@
+<Climate Data Archiving, connectedTo, Seasonal Outlook Preparation>
+<Hurricane Trajectory Modeling, connectedTo, Ocean_Atmosphere Interaction Study>
+<Meteorological Station Maintenance, connectedTo, Radar Imaging>
+<Numerical Weather Prediction, validates, Climate Data Archiving>
+<Ocean_Atmosphere Interaction Study, connectedTo, Marine Weather Forecast>
+<Radar Imaging, classifies, Snowfall Measurement>
+<Seasonal Outlook Preparation, calibrates, Severe Weather Warning>
+<Severe Weather Warning, measures, Meteorological Station Maintenance>
+<Snowfall Measurement, connectedTo, Hurricane Trajectory Modeling>
+<Snowfall Measurement, visualizes, Ocean_Atmosphere Interaction Study>
+<Temperature Monitoring, connectedTo, Numerical Weather Prediction>
+<Temperature Monitoring, integrates, Climate Data Archiving>
diff --git a/test/graphviz/scanned_hard/graphviz_42.dot b/test/graphviz/scanned_hard/graphviz_42.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1793d9ed2d3de3b6605ff3208c81fa7dee8f6914
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_42.dot
@@ -0,0 +1,27 @@
+digraph {
+	rankdir=BT
+	N0 [label="Waste Audit" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N1 [label="Textile Recycling" color="#673AB7" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N2 [label="Paper Recycling" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N3 [label="Landfill Gas Collection" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N4 [label="Waste Management Policy Development" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+	N5 [label="Extended Producer Responsibility" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N6 [label="Waste Collection" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N7 [label="Plastic Recycling Technologies" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N8 [label=Composting color="#F7BEE0" fillcolor="#FAEBF3" shape=plaintext style=filled]
+	N9 [label="Transfer Station Management" color="#673AB7" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+	N10 [label="Illegal Dumping Monitoring" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N11 [label="Material Recovery Facility Operation" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N0 -> N1 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=extracts color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=develops color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=incinerates color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=reports color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=controls color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N11 -> N9 [label=monitors color="#673AB7" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_43.dot b/test/graphviz/scanned_hard/graphviz_43.dot
new file mode 100644
index 0000000000000000000000000000000000000000..029b3edcb042b685b3c7ca1de27c16d6fb3fc147
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_43.dot
@@ -0,0 +1,28 @@
+digraph {
+	rankdir=BT
+	N0 [label="Water Source Identification" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N1 [label="Smart Water Networks" color="#26A69A" fillcolor="#E0F2F1" shape=octagon style=filled]
+	N2 [label="Pollution Source Identification" color="#26A69A" fillcolor="#E0F2F1" shape=diamond style=filled]
+	N3 [label="Industrial Water Use Optimization" color="#8C9EFF" fillcolor="#D3D7EB" shape=octagon style=filled]
+	N4 [label="Water Treatment" color="#8C9EFF" fillcolor="#D3D7EB" shape=diamond style=filled]
+	N5 [label="Wastewater Collection" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N6 [label="Water Infrastructure Maintenance" color="#AED581" fillcolor="#F0F4C3" shape=plaintext style=filled]
+	N7 [label="Hydroelectric Power Generation" color="#8C9EFF" fillcolor="#D3D7EB" shape=Mdiamond style=filled]
+	N8 [label="Water Loss Detection" color="#8C9EFF" fillcolor="#D3D7EB" shape=parallelogram style=filled]
+	N9 [label="Water Meter Reading" color="#26A69A" fillcolor="#E0F2F1" shape=folder style=filled]
+	N10 [label=Desalination color="#AED581" fillcolor="#F0F4C3" shape=plaintext style=filled]
+	N11 [label="Water Conservation Planning" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N0 -> N1 [label=repairs color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=controls color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=secures color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=measures color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=designs color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=models color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=treats color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N0 [label=predicts color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N11 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_44.txt b/test/graphviz/scanned_hard/graphviz_44.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a43718c752f3ccbc7107d906b32cdbac0a6db922
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_44.txt
@@ -0,0 +1,8 @@
+<Cleaning and Processing, connectedTo, Deposit_Return Schemes>
+<Cleaning and Processing, connectedTo, Sorting and Segregation>
+<Commercial Recycling Solutions, connectedTo, Cleaning and Processing>
+<Energy Recovery from Non_Recyclables, reuses, Deposit_Return Schemes>
+<Mechanical Recycling, classifies, Energy Recovery from Non_Recyclables>
+<New Product Manufacturing, optimizes, Mechanical Recycling>
+<Recycling Facility Optimization, connectedTo, New Product Manufacturing>
+<Sorting and Segregation, finances, Recycling Facility Optimization>
diff --git a/test/graphviz/scanned_hard/graphviz_46.dot b/test/graphviz/scanned_hard/graphviz_46.dot
new file mode 100644
index 0000000000000000000000000000000000000000..356aa6d0a2c1f61eba42fdf4eba2dc3cdf6b55d9
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_46.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=LR
+	N0 [label="Client Communication" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N1 [label="Biosecurity Measures" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N2 [label="Wildlife Rehabilitation" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N3 [label=Microchipping color="#FFF8A6" fillcolor="#FFFDE0" shape=octagon style=filled]
+	N4 [label="Parasite Control" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N5 [label="Post_operative Care" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N6 [label="Dental Care" color="#A188D0" fillcolor="#DACBE3" shape=parallelogram style=filled]
+	N7 [label="Veterinary Technology Training" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N8 [label="Veterinary Pathology" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N0 -> N1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=monitors color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=documents color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=shelters color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N7 -> N4 [label=consults color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_5.dot b/test/graphviz/scanned_hard/graphviz_5.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6e14ba4c94e9377fcbcddade7f27868a72c86769
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_5.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=LR
+	N0 [label="Product Listing" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N1 [label=Shipment color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N2 [label="Supplier Onboarding" color="#4FC3F7" fillcolor="#E1F5FE" shape=octagon style=filled]
+	N3 [label="Search Engine Optimization" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N4 [label="Return Merchandise Authorization" color="#4FC3F7" fillcolor="#E1F5FE" shape=octagon style=filled]
+	N5 [label="Add to Cart" color="#80DDEA" fillcolor="#D3F7F9" shape=octagon style=filled]
+	N6 [label="Mobile App Interaction" color="#D3EB9F" fillcolor="#F8FDD3" shape=folder style=filled]
+	N7 [label="A or B Testing" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N0 -> N1 [label=lists color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=secures color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=personalizes color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=sorts color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N5 -> N3 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_5.txt b/test/graphviz/scanned_hard/graphviz_5.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f6d3b8674d59d967dee72a76a7f02bcbce9cd9f0
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_5.txt
@@ -0,0 +1,8 @@
+<Add to Cart, connectedTo, Search Engine Optimization>
+<Add to Cart, personalizes, Mobile App Interaction>
+<Mobile App Interaction, sorts, A or B Testing>
+<Product Listing, lists, Shipment>
+<Return Merchandise Authorization, secures, Add to Cart>
+<Search Engine Optimization, connectedTo, Return Merchandise Authorization>
+<Shipment, connectedTo, Supplier Onboarding>
+<Supplier Onboarding, connectedTo, Search Engine Optimization>
diff --git a/test/graphviz/scanned_hard/graphviz_50.dot b/test/graphviz/scanned_hard/graphviz_50.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dcce6955a6ea9cd1a32ec15f150d47136a1a8551
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_50.dot
@@ -0,0 +1,22 @@
+digraph {
+	rankdir=TD
+	N0 [label="Naval Operations" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Chaplain Services" color="#7986CB" fillcolor="#E8EAF6" shape=folder style=filled]
+	N2 [label="Specialized Training" color="#FFC107" fillcolor="#FFECB3" shape=Mdiamond style=filled]
+	N3 [label=Surveillance color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N4 [label="Weapon Systems Development" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N5 [label="Joint Exercises" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N6 [label="Basic Training" color="#CDDC39" fillcolor="#E6EE9C" shape=octagon style=filled]
+	N7 [label="Equipment Maintenance" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N8 [label="Crisis Management" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N0 -> N1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=executes color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=recruits color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=develops color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=inspects color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N4 [label=supplies color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N8 [label=reports color="#7986CB" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_51.dot b/test/graphviz/scanned_hard/graphviz_51.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b9995d6e73beb4f5964818544b174cfa48a2c261
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_51.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=BT
+	N0 [label="Delay Management" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N1 [label="Passenger Boarding" color="#03A9F4" fillcolor="#B3E5FC" shape=octagon style=filled]
+	N2 [label="Unmanned Aerial Vehicle Integration" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N3 [label="Airworthiness Certification" color="#D2D2D2" fillcolor="#F0F0F0" shape=octagon style=filled]
+	N4 [label="Aircraft Maintenance" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N5 [label="Emergency Procedures Training" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N6 [label="In_flight Service" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N7 [label="Passenger Check_in" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N0 -> N1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=schedules color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=navigates color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=communicates color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=documents color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N6 [label=de_ices color="#4285F4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_51.txt b/test/graphviz/scanned_hard/graphviz_51.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7490a6ff78ae8fe3e076d13d0aed4e60a1304c8b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_51.txt
@@ -0,0 +1,8 @@
+<Aircraft Maintenance, connectedTo, Emergency Procedures Training>
+<Airworthiness Certification, navigates, Aircraft Maintenance>
+<Delay Management, connectedTo, Passenger Boarding>
+<Emergency Procedures Training, communicates, In_flight Service>
+<In_flight Service, documents, Passenger Check_in>
+<Passenger Boarding, connectedTo, Unmanned Aerial Vehicle Integration>
+<Passenger Check_in, de_ices, In_flight Service>
+<Unmanned Aerial Vehicle Integration, schedules, Airworthiness Certification>
diff --git a/test/graphviz/scanned_hard/graphviz_54.dot b/test/graphviz/scanned_hard/graphviz_54.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ddc2516827dd1d21cd1d0d26918691e95461857b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_54.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=TD
+	N0 [label="Lab_on_a_Chip Devices" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N1 [label="Food Packaging Improvement" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N2 [label="Carbon Nanotube Synthesis" color="#AF56A6" fillcolor="#DDCEDD" shape=Mdiamond style=filled]
+	N3 [label="Nanofabrication Techniques" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+	N4 [label=Nanotoxicology color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N5 [label="Public Perception of Nanotechnology" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N6 [label="Drug Delivery Systems" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N7 [label=Spintronics color="#EAEFA5" fillcolor="#FDFCEB" shape=hexagon style=filled]
+	N8 [label="Quantum Dots" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N9 [label="Catalysis at Nanoscale" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N0 -> N1 [label=analyzes color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=researches color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=controls color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=functionalizes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N6 [label=engineers color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_55.dot b/test/graphviz/scanned_hard/graphviz_55.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4c458bdcaa36ad882e0ae275d7f39ae4d420cfd4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_55.dot
@@ -0,0 +1,22 @@
+digraph {
+	rankdir=LR
+	N0 [label="Quantum Advantage Demonstration" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N1 [label="Quantum Hardware Control" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N2 [label="Superconducting Qubits" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N3 [label="Quantum Sensing" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N4 [label="Quantum Computing Education" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N5 [label="Quantum Computing in Drug Discovery" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N6 [label="Quantum Simulation" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N7 [label="Microwave Control for Qubits" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N8 [label="Financial Modeling with Quantum Computing" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N0 -> N1 [label=corrects color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=debugs color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=analyzes color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=builds color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N2 [label=educates color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_55.txt b/test/graphviz/scanned_hard/graphviz_55.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2b6a73560657386f72627021f4a011bfefa86733
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_55.txt
@@ -0,0 +1,10 @@
+<Microwave Control for Qubits, connectedTo, Financial Modeling with Quantum Computing>
+<Quantum Advantage Demonstration, corrects, Quantum Hardware Control>
+<Quantum Computing Education, builds, Quantum Computing in Drug Discovery>
+<Quantum Computing Education, connectedTo, Quantum Advantage Demonstration>
+<Quantum Computing Education, educates, Superconducting Qubits>
+<Quantum Computing in Drug Discovery, connectedTo, Quantum Simulation>
+<Quantum Hardware Control, debugs, Superconducting Qubits>
+<Quantum Sensing, connectedTo, Quantum Computing Education>
+<Quantum Simulation, connectedTo, Microwave Control for Qubits>
+<Superconducting Qubits, analyzes, Quantum Sensing>
diff --git a/test/graphviz/scanned_hard/graphviz_56.dot b/test/graphviz/scanned_hard/graphviz_56.dot
new file mode 100644
index 0000000000000000000000000000000000000000..65d96d7af79b7f8ed190b8d4bd41fd0fcf594b95
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_56.dot
@@ -0,0 +1,22 @@
+digraph {
+	rankdir=RL
+	N0 [label="Neuro_VR Interfaces" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label="Headset Development" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N2 [label="Industrial Maintenance Support" color="#BDBDBD" fillcolor="#F5F5F5" shape=Mdiamond style=filled]
+	N3 [label="Eye Tracking" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N4 [label="Virtual Reality Game Development" color="#BDBDBD" fillcolor="#F5F5F5" shape=plaintext style=filled]
+	N5 [label="Performance Optimization" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N6 [label="User Experience Testing" color="#FFC2C2" fillcolor="#FFEBEB" shape=parallelogram style=filled]
+	N7 [label="Environment Mapping" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N8 [label="Remote Collaboration Tools" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=creates color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=audits color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=captures color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=analyzes color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N5 -> N3 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_58.dot b/test/graphviz/scanned_hard/graphviz_58.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8d52a4385aa1f104c7471a081d131f9cf9081007
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_58.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=BT
+	N0 [label="Beat Making" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N1 [label=Sampling color="#7E57C2" fillcolor="#D1C4E9" shape=plaintext style=filled]
+	N2 [label="A&R" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N3 [label="Concert Promotion" color="#7E57C2" fillcolor="#D1C4E9" shape=oval style=filled]
+	N4 [label="Music Therapy" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N5 [label="Lyric Writing" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N6 [label="Live Sound Engineering" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N7 [label="Music Education" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N8 [label="Synthesizer Programming" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N0 -> N1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=engineers color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=sings color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=manages color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=analyzes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_59.txt b/test/graphviz/scanned_hard/graphviz_59.txt
new file mode 100644
index 0000000000000000000000000000000000000000..48ccc1229ddd119f7469cc0a2479797b56f18ce4
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_59.txt
@@ -0,0 +1,8 @@
+<Archiving and Preservation, connectedTo, Set Construction>
+<Budget Management, connectedTo, Archiving and Preservation>
+<Cinematography, connectedTo, Directing>
+<Costume Design, composes, Lighting Design>
+<Directing, manages, Costume Design>
+<Green Production Practices, coordinates, Budget Management>
+<Lighting Design, designs, Green Production Practices>
+<Set Construction, connectedTo, Cinematography>
diff --git a/test/graphviz/scanned_hard/graphviz_6.txt b/test/graphviz/scanned_hard/graphviz_6.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b6cd4136342fe3eef1993a793d5036aec45f6f48
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_6.txt
@@ -0,0 +1,11 @@
+<Arrival, connectedTo, Cargo Loading>
+<Bus Stop Management, alerts, Load Balancing>
+<Driver Allocation, boards, Bus Stop Management>
+<Driver Allocation, connectedTo, Maintenance Check>
+<Load Balancing, connectedTo, Ride_sharing Request>
+<Luggage Handling, connectedTo, Driver Allocation>
+<Maintenance Check, checks, Train Dispatch>
+<Public Transport Ticketing, secures, Vehicle Assignment>
+<Ride_sharing Request, connectedTo, Public Transport Ticketing>
+<Train Dispatch, connectedTo, Bus Stop Management>
+<Vehicle Assignment, maintains, Arrival>
diff --git a/test/graphviz/scanned_hard/graphviz_63.dot b/test/graphviz/scanned_hard/graphviz_63.dot
new file mode 100644
index 0000000000000000000000000000000000000000..95ea480bcd646ea77d3d13df63aaca2b40432c45
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_63.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=RL
+	N0 [label="Competitive Analysis" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N1 [label="Partnership Marketing" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N2 [label="Event Marketing" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N3 [label="Content Marketing" color="#4DB6AC" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N4 [label="Campaign Performance Tracking" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N5 [label="Marketing Budget Allocation" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N6 [label="Customer Segmentation" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N7 [label="Website Design and Optimization" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N8 [label="Marketing Analytics" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N9 [label="Brand Reputation Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="enhances experiences" color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label="organizes events" color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="manages social media" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="optimizes SEO" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=influences color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N9 [label="tracks performance" color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N0 -> N6 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_64.dot b/test/graphviz/scanned_hard/graphviz_64.dot
new file mode 100644
index 0000000000000000000000000000000000000000..49dcc623f0f4e28568a13c5b6c298a3fae2a9a14
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_64.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=LR
+	N0 [label="Demographic Targeting" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N1 [label="Performance Tracking" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N2 [label="Competitor Ad Analysis" color="#FFC2C2" fillcolor="#FFEBEB" shape=plaintext style=filled]
+	N3 [label="Campaign Planning" color="#FFD54F" fillcolor="#FFF8E1" shape=plaintext style=filled]
+	N4 [label="Fraud Detection in Ads" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N5 [label="Audience Targeting" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N6 [label="Social Media Ads" color="#CD8FF2" fillcolor="#ECCFF5" shape=oval style=filled]
+	N7 [label="Native Advertising" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+	N8 [label="Ad Network Management" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N0 -> N1 [label="creates ads" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="plans campaigns" color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="native ads" color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="programmatic ads" color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label="ensures compliance" color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_65.dot b/test/graphviz/scanned_hard/graphviz_65.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6869409b5ac8f88a56440e603d77140ced38a06b
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_65.dot
@@ -0,0 +1,22 @@
+digraph {
+	rankdir=BT
+	N0 [label="Intellectual Property Management" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N1 [label="Decentralized Network Design" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N2 [label="Tokenomics Design" color="#26A69A" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N3 [label="Financial Asset Tokenization" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N4 [label="Security Auditing for Blockchains" color="#26A69A" fillcolor="#E0F2F1" shape=folder style=filled]
+	N5 [label="Energy Trading on Blockchain" color="#B8C0F5" fillcolor="#ECF0FD" shape=Mdiamond style=filled]
+	N6 [label="Smart Contract Development" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+	N7 [label="Public Blockchain Deployment" color="#FFE69C" fillcolor="#FFF9D4" shape=Mdiamond style=filled]
+	N8 [label="Governance Models for Blockchains" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N0 -> N1 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="tokenizes assets" color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="educates users" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="traces provenance" color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="implements sharding" color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label="launches STOs" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label="enables voting" color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N1 [label="supports DeFi" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_65.txt b/test/graphviz/scanned_hard/graphviz_65.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d8ad5c3ef9fa16129f5183529cd831f490d1ffe1
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_65.txt
@@ -0,0 +1,10 @@
+<Decentralized Network Design, tokenizes assets, Tokenomics Design>
+<Energy Trading on Blockchain, launches STOs, Smart Contract Development>
+<Energy Trading on Blockchain, supports DeFi, Decentralized Network Design>
+<Financial Asset Tokenization, traces provenance, Security Auditing for Blockchains>
+<Governance Models for Blockchains, connectedTo, Financial Asset Tokenization>
+<Intellectual Property Management, connectedTo, Decentralized Network Design>
+<Public Blockchain Deployment, enables voting, Governance Models for Blockchains>
+<Security Auditing for Blockchains, implements sharding, Energy Trading on Blockchain>
+<Smart Contract Development, connectedTo, Public Blockchain Deployment>
+<Tokenomics Design, educates users, Financial Asset Tokenization>
diff --git a/test/graphviz/scanned_hard/graphviz_66.txt b/test/graphviz/scanned_hard/graphviz_66.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ffa99aeda8fde79c933c71e1b9e0f072f8698812
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_66.txt
@@ -0,0 +1,8 @@
+<Cross_chain Swaps, analyzes markets, Staking>
+<Cross_chain Swaps, enables swaps, Tax Reporting for Crypto>
+<Interoperability Solutions, connectedTo, Staking>
+<KYC or AML Procedures, connectedTo, Web3 Integration>
+<Portfolio Management, creates NFTs, Token Generation Event>
+<Staking, custodies assets, Cross_chain Swaps>
+<Tax Reporting for Crypto, connectedTo, Portfolio Management>
+<Web3 Integration, connectedTo, Interoperability Solutions>
diff --git a/test/graphviz/scanned_hard/graphviz_67.dot b/test/graphviz/scanned_hard/graphviz_67.dot
new file mode 100644
index 0000000000000000000000000000000000000000..28f0e20ee99b6ac2b7ba92f94c57229409998e9e
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_67.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=LR
+	N0 [label="Logistics for Rewards" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N1 [label="Platform Fee Management" color="#61CAC3" fillcolor="#C2E8E6" shape=diamond style=filled]
+	N2 [label="Debt Crowdfunding" color="#61CAC3" fillcolor="#C2E8E6" shape=oval style=filled]
+	N3 [label="Marketing Strategy" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N4 [label="Due Diligence for Projects" color="#61CAC3" fillcolor="#C2E8E6" shape=oval style=filled]
+	N5 [label="Donation_Based Crowdfunding" color="#61CAC3" fillcolor="#C2E8E6" shape=parallelogram style=filled]
+	N6 [label="Financial Projection Analysis" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N7 [label="International Crowdfunding" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N8 [label="Tax Implications of Crowdfunding" color="#388E3C" fillcolor="#F1F8E9" shape=octagon style=filled]
+	N9 [label="Campaign Creation" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="manages shareholders" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="collects donations" color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label="designs rewards" color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label="creates campaigns" color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label="verifies identities" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label="develops products" color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N1 [label="adheres to regulations" color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_67.txt b/test/graphviz/scanned_hard/graphviz_67.txt
new file mode 100644
index 0000000000000000000000000000000000000000..414077928e65c980a67caa432aec0e140a2a2c3a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_67.txt
@@ -0,0 +1,11 @@
+<Campaign Creation, connectedTo, Donation_Based Crowdfunding>
+<Debt Crowdfunding, collects donations, Marketing Strategy>
+<Donation_Based Crowdfunding, verifies identities, Financial Projection Analysis>
+<Due Diligence for Projects, creates campaigns, Donation_Based Crowdfunding>
+<Financial Projection Analysis, develops products, International Crowdfunding>
+<International Crowdfunding, connectedTo, Tax Implications of Crowdfunding>
+<Logistics for Rewards, connectedTo, Platform Fee Management>
+<Marketing Strategy, adheres to regulations, Platform Fee Management>
+<Marketing Strategy, designs rewards, Due Diligence for Projects>
+<Platform Fee Management, manages shareholders, Debt Crowdfunding>
+<Tax Implications of Crowdfunding, connectedTo, Campaign Creation>
diff --git a/test/graphviz/scanned_hard/graphviz_68.txt b/test/graphviz/scanned_hard/graphviz_68.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5eb9c10066aed7098db6cf5605f60ad67d33c5a3
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_68.txt
@@ -0,0 +1,9 @@
+<API Development for IoT, deploys gateways, Security Implementation>
+<API Development for IoT, performs OTAs, Industrial IoT>
+<Data Processing at Edge, processes streams, Energy Management Systems>
+<Energy Management Systems, connectedTo, Smart Manufacturing>
+<Gateway Development, connectedTo, Security Implementation>
+<Industrial IoT, complies with regulations, Gateway Development>
+<Security Implementation, manages power, Data Processing at Edge>
+<Smart Manufacturing, connectedTo, Industrial IoT>
+<Smart Manufacturing, manufactures devices, Data Privacy in IoT>
diff --git a/test/graphviz/scanned_hard/graphviz_69.dot b/test/graphviz/scanned_hard/graphviz_69.dot
new file mode 100644
index 0000000000000000000000000000000000000000..63895be67623c9e850dbf2dc2be5db724845a7b1
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_69.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=RL
+	N0 [label="Real_time Analytics at Edge" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N1 [label="Edge Computing Hardware Selection" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N2 [label="Edge Application Development" color="#388E3C" fillcolor="#F1F8E9" shape=plaintext style=filled]
+	N3 [label="Remote Device Management" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N4 [label="Containerization at Edge" color="#388E3C" fillcolor="#F1F8E9" shape=Mdiamond style=filled]
+	N5 [label="Compliance and Governance at Edge" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N6 [label="Latency Reduction" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N7 [label="Data Filtering at Edge" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N0 -> N1 [label="manages APIs" color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="secures data" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="connects endpoints" color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label="optimizes telecoms" color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N6 [label="manages fleet" color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_7.txt b/test/graphviz/scanned_hard/graphviz_7.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3a520871740c3825027067a897a75c23e158ac37
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_7.txt
@@ -0,0 +1,9 @@
+<Grid Modernization, alerts, Load Distribution>
+<Grid Modernization, connectedTo, Sensor Reading>
+<Load Distribution, isolates, Substation Automation>
+<Nuclear Reactor Control, connectedTo, Transmission Line Maintenance>
+<Peak Shaving, balances, Demand Forecast>
+<Sensor Reading, plans, Load Distribution>
+<Substation Automation, connectedTo, Nuclear Reactor Control>
+<Transformer Station, connectedTo, Peak Shaving>
+<Transmission Line Maintenance, audits, Transformer Station>
diff --git a/test/graphviz/scanned_hard/graphviz_70.dot b/test/graphviz/scanned_hard/graphviz_70.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f264b9f2e00dffb75bc5e51758c2e941db5215c8
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_70.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=LR
+	N0 [label="Public Cloud Management" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Disaster Recovery in Cloud" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N2 [label="Database as a Service" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N3 [label="Cloud Migration Strategy" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N4 [label="Infrastructure as a Service" color="#FF5722" fillcolor="#FFCCBC" shape=folder style=filled]
+	N5 [label="Machine Learning as a Service" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N6 [label="Cloud_based VPN Setup" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N7 [label="Cost Optimization in Cloud" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N8 [label="Platform as a Service" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N9 [label="Data Storage in Cloud" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N0 -> N1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="deploys private clouds" color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label="automates tasks" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="implements DevOps" color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="stores data" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label="provides IaaS" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> N9 [label="manages load balancing" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N4 [label="monitors performance" color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_70.txt b/test/graphviz/scanned_hard/graphviz_70.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cca6d639c7728be4e2eeb5612986933c676a7247
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_70.txt
@@ -0,0 +1,11 @@
+<Cloud Migration Strategy, automates tasks, Infrastructure as a Service>
+<Cloud_based VPN Setup, monitors performance, Infrastructure as a Service>
+<Cloud_based VPN Setup, stores data, Cost Optimization in Cloud>
+<Cost Optimization in Cloud, connectedTo, Platform as a Service>
+<Database as a Service, deploys private clouds, Cloud Migration Strategy>
+<Disaster Recovery in Cloud, connectedTo, Database as a Service>
+<Infrastructure as a Service, connectedTo, Machine Learning as a Service>
+<Machine Learning as a Service, implements DevOps, Cloud_based VPN Setup>
+<Platform as a Service, provides IaaS, Data Storage in Cloud>
+<Public Cloud Management, connectedTo, Disaster Recovery in Cloud>
+<Public Cloud Management, manages load balancing, Data Storage in Cloud>
diff --git a/test/graphviz/scanned_hard/graphviz_71.dot b/test/graphviz/scanned_hard/graphviz_71.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6ee87b6b72b3a99cc11b574e724b75eddbc83f7a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_71.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=TD
+	N0 [label="Proxy Server Configuration" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N1 [label="Cabling and Wiring" color="#FBC02D" fillcolor="#FFFDE7" shape=octagon style=filled]
+	N2 [label="Group Policy Management" color="#FBC02D" fillcolor="#FFFDE7" shape=Mdiamond style=filled]
+	N3 [label="Firewall Management" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N4 [label="Directory Services" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N5 [label="Web Server Configuration" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N6 [label="IT Asset Management" color="#90A4AE" fillcolor="#ECEFF1" shape=folder style=filled]
+	N7 [label="Load Balancer Setup" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N8 [label="Rack and Cabinet Management" color="#FFCC80" fillcolor="#FFF0CC" shape=plaintext style=filled]
+	N9 [label="Network Security" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N0 -> N1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="manages users" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="manages groups" color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="installs software" color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="configures load balancers" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label="integrates clouds" color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N9 -> N0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_71.txt b/test/graphviz/scanned_hard/graphviz_71.txt
new file mode 100644
index 0000000000000000000000000000000000000000..40c014068089fcdcbd79a37588d01ee28b74ac6d
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_71.txt
@@ -0,0 +1,10 @@
+<Cabling and Wiring, connectedTo, Group Policy Management>
+<Directory Services, manages groups, Web Server Configuration>
+<Firewall Management, connectedTo, Directory Services>
+<Group Policy Management, manages users, Firewall Management>
+<IT Asset Management, connectedTo, Load Balancer Setup>
+<Load Balancer Setup, configures load balancers, Rack and Cabinet Management>
+<Network Security, connectedTo, Proxy Server Configuration>
+<Proxy Server Configuration, connectedTo, Cabling and Wiring>
+<Rack and Cabinet Management, integrates clouds, Network Security>
+<Web Server Configuration, installs software, IT Asset Management>
diff --git a/test/graphviz/scanned_hard/graphviz_72.txt b/test/graphviz/scanned_hard/graphviz_72.txt
new file mode 100644
index 0000000000000000000000000000000000000000..745010f49e3d58fb761f9bea893b58ab816973df
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_72.txt
@@ -0,0 +1,11 @@
+<Automated Rollbacks, integrates security, GitOps>
+<Collaboration Tools, connectedTo, Dynamic Application Security Testing>
+<Configuration Management, connectedTo, Post_Mortem Analysis>
+<Configuration Management, performs rollbacks, Infrastructure as Code>
+<Continuous Delivery, connectedTo, Chaos Engineering>
+<Continuous Delivery, connectedTo, Environment Management>
+<Dynamic Application Security Testing, deploys canaries, Infrastructure as Code>
+<Environment Management, connectedTo, Automated Rollbacks>
+<GitOps, automates tests, Chaos Engineering>
+<Infrastructure as Code, connectedTo, Continuous Delivery>
+<Post_Mortem Analysis, manages versions, Collaboration Tools>
diff --git a/test/graphviz/scanned_hard/graphviz_73.dot b/test/graphviz/scanned_hard/graphviz_73.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b073fa306290b29887de5ef50c27e4a53327d56c
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_73.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=TD
+	N0 [label=Maintenance color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N1 [label="Continuous Delivery" color="#4CAF50" fillcolor="#C8E6C9" shape=octagon style=filled]
+	N2 [label="System Design" color="#4CAF50" fillcolor="#C8E6C9" shape=Mdiamond style=filled]
+	N3 [label=Containerization color="#4CAF50" fillcolor="#C8E6C9" shape=diamond style=filled]
+	N4 [label="Code Review" color="#66BB6A" fillcolor="#E8F5E9" shape=diamond style=filled]
+	N5 [label="Database Design" color="#26A69A" fillcolor="#E0F2F1" shape=octagon style=filled]
+	N6 [label="Technical Debt Management" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N7 [label="Architecture Planning" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N0 -> N1 [label="builds backends" color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="builds desktop apps" color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label="manages technical debt" color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N2 -> N5 [label="creates UIs" color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_73.txt b/test/graphviz/scanned_hard/graphviz_73.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d0dd09bf211ff4dc73570e47f4c343a1882275b8
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_73.txt
@@ -0,0 +1,8 @@
+<Code Review, connectedTo, Database Design>
+<Containerization, connectedTo, Code Review>
+<Continuous Delivery, connectedTo, System Design>
+<Database Design, builds desktop apps, Technical Debt Management>
+<Maintenance, builds backends, Continuous Delivery>
+<System Design, connectedTo, Containerization>
+<System Design, creates UIs, Database Design>
+<Technical Debt Management, manages technical debt, Architecture Planning>
diff --git a/test/graphviz/scanned_hard/graphviz_74.dot b/test/graphviz/scanned_hard/graphviz_74.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3c1f3558ea7d124e34bf0c0a60e942bacaf0779c
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_74.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=LR
+	N0 [label="RF Circuit Design" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N1 [label="Reverse Engineering" color="#6EB76D" fillcolor="#E9F7E8" shape=Mdiamond style=filled]
+	N2 [label="Cost Optimization" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N3 [label="Microcontroller Programming" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N4 [label="Testing and Validation" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N5 [label="PCB Layout" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N6 [label="Supply Chain Management for Components" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+	N7 [label="Troubleshooting and Debugging" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N0 -> N1 [label="analyzes failures" color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="lays out PCBs" color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="troubleshoots issues" color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label="optimizes costs" color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="manages cables" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N1 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_76.txt b/test/graphviz/scanned_hard/graphviz_76.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0b33b097b049cf2b034ad3f49d09f1951e743d12
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_76.txt
@@ -0,0 +1,11 @@
+<Content Moderation, connectedTo, Group Management>
+<Content Strategy, runs polls, Social Selling>
+<Follower Growth Monitoring, connectedTo, Influencer Collaboration>
+<Group Management, drives sales, Social Media Audits>
+<Influencer Collaboration, analyzes engagement, Partnership Management on Social>
+<Partnership Management on Social, connectedTo, Social Media Audits>
+<Personal Branding on Social Media, understands algorithms, Content Strategy>
+<Reporting and Optimization, curates UGC, Follower Growth Monitoring>
+<Social Media Audits, connectedTo, Personal Branding on Social Media>
+<Social Selling, selects platforms, Content Moderation>
+<User_Generated Content Curation, builds reputation, Reporting and Optimization>
diff --git a/test/graphviz/scanned_hard/graphviz_77.txt b/test/graphviz/scanned_hard/graphviz_77.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3da729ceaf7eb315eb9297aba1c7ecd1fdfbe6aa
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_77.txt
@@ -0,0 +1,8 @@
+<Image Search, manages penalties, Technical SEO>
+<Local SEO, optimizes keywords, Google My Business Management>
+<On_Page SEO, connectedTo, Search Result Display>
+<Ranking Algorithms, handles voice search, Site Architecture Optimization>
+<Search Result Display, optimizes UX, Ranking Algorithms>
+<Site Architecture Optimization, connectedTo, Local SEO>
+<Technical SEO, connectedTo, On_Page SEO>
+<Technical SEO, optimizes for mobile, Search Result Display>
diff --git a/test/graphviz/scanned_hard/graphviz_79.txt b/test/graphviz/scanned_hard/graphviz_79.txt
new file mode 100644
index 0000000000000000000000000000000000000000..dde2de4ba3459f28702e48d251d0c7b137b0217f
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_79.txt
@@ -0,0 +1,9 @@
+<Collaborative Projects, provides formative assessment, Test Preparation Courses>
+<Course Evaluation, connectedTo, Collaborative Projects>
+<Digital Badges, hosts MOOCs, Course Evaluation>
+<Language Learning Platforms, connectedTo, Parent or Guardian Communication>
+<Language Learning Platforms, issues certificates, Micro_credential Programs>
+<Micro_credential Programs, manages student info, Digital Badges>
+<Parent or Guardian Communication, connectedTo, Virtual Classroom Facilitation>
+<Parent or Guardian Communication, develops educational apps, Micro_credential Programs>
+<Virtual Classroom Facilitation, connectedTo, Language Learning Platforms>
diff --git a/test/graphviz/scanned_hard/graphviz_8.txt b/test/graphviz/scanned_hard/graphviz_8.txt
new file mode 100644
index 0000000000000000000000000000000000000000..065e62fd45bbde203f3d40003e713cc81dfaad69
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_8.txt
@@ -0,0 +1,12 @@
+<Amicus Brief Submission, settles, Corporate Formation>
+<Child Custody, audits, Amicus Brief Submission>
+<Court Order Execution, connectedTo, Jury Selection>
+<Due Diligence, connectedTo, Plea Bargain>
+<Evidence Collection, negotiates, Trademark Registration>
+<Evidence Collection, protects, Child Custody>
+<Intel Property Licensing, summarizes, Due Diligence>
+<Jury Selection, connectedTo, Intel Property Licensing>
+<Plea Bargain, analyzes, Trademark Registration>
+<Trademark Registration, connectedTo, Trial Session>
+<Trial Session, interviews, Due Diligence>
+<Trial Session, mediates, Evidence Collection>
diff --git a/test/graphviz/scanned_hard/graphviz_80.dot b/test/graphviz/scanned_hard/graphviz_80.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0134f6bc49a25f4693ca49ba5433d5bb0466bf32
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_80.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=TD
+	N0 [label="University Partnerships" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N1 [label="Content Licensing" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N2 [label="Employer Recognition" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N3 [label="Engagement Metrics Tracking" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+	N4 [label="Learner Support" color="#A1D7CD" fillcolor="#EDF5F3" shape=diamond style=filled]
+	N5 [label="Financial Aid for Learners" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N6 [label="Gamification for Engagement" color="#A1D7CD" fillcolor="#EDF5F3" shape=octagon style=filled]
+	N7 [label="Learner Feedback Analysis" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N8 [label="Technical Infrastructure for Scale" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N0 -> N1 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label="issues statements of accomplishment" color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="hosts platforms" color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="translates content" color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="monetizes offerings" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label="provides accessibility" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N8 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_80.txt b/test/graphviz/scanned_hard/graphviz_80.txt
new file mode 100644
index 0000000000000000000000000000000000000000..60e72ba2109e5829589326480c2c9295ddcf5fd9
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_80.txt
@@ -0,0 +1,9 @@
+<Content Licensing, issues statements of accomplishment, Employer Recognition>
+<Employer Recognition, hosts platforms, Engagement Metrics Tracking>
+<Engagement Metrics Tracking, translates content, Learner Support>
+<Financial Aid for Learners, connectedTo, Gamification for Engagement>
+<Financial Aid for Learners, connectedTo, Technical Infrastructure for Scale>
+<Gamification for Engagement, connectedTo, Learner Feedback Analysis>
+<Learner Feedback Analysis, provides accessibility, Technical Infrastructure for Scale>
+<Learner Support, monetizes offerings, Financial Aid for Learners>
+<University Partnerships, connectedTo, Content Licensing>
diff --git a/test/graphviz/scanned_hard/graphviz_81.dot b/test/graphviz/scanned_hard/graphviz_81.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fd3adb2ef7470a5325017e864b077b1be1261924
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_81.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=LR
+	N0 [label="Critical Thinking Development" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N1 [label="Score Analysis" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N2 [label="Exam Day Tips" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N3 [label="Certification Exam Prep" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N4 [label="Time Management Coaching" color="#5C6BC0" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N5 [label="Subject Matter Review" color="#FFB74D" fillcolor="#FFF3E0" shape=plaintext style=filled]
+	N6 [label="College Entrance Exam Prep" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N7 [label="Virtual Proctoring" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N8 [label="Motivation Coaching" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N0 -> N1 [label=sells color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=teaches color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=registers color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=adapts color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_81.txt b/test/graphviz/scanned_hard/graphviz_81.txt
new file mode 100644
index 0000000000000000000000000000000000000000..20f08567456a44f8619289989881b92d4f44a040
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_81.txt
@@ -0,0 +1,9 @@
+<Certification Exam Prep, teaches, Time Management Coaching>
+<College Entrance Exam Prep, adapts, Virtual Proctoring>
+<Critical Thinking Development, sells, Score Analysis>
+<Exam Day Tips, connectedTo, Certification Exam Prep>
+<Score Analysis, connectedTo, Exam Day Tips>
+<Subject Matter Review, connectedTo, College Entrance Exam Prep>
+<Subject Matter Review, connectedTo, Motivation Coaching>
+<Time Management Coaching, registers, Subject Matter Review>
+<Virtual Proctoring, connectedTo, Motivation Coaching>
diff --git a/test/graphviz/scanned_hard/graphviz_84.txt b/test/graphviz/scanned_hard/graphviz_84.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6245e52225f042a99e8eeae8d65cde9236b3813a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_84.txt
@@ -0,0 +1,8 @@
+<Dietary Assessment, connectedTo, Inflammation and Diet>
+<Food Fortification Strategies, calculates, Food Label Interpretation>
+<Food Fortification Strategies, plans, Genetic Nutrition Counseling>
+<Food Label Interpretation, prepares, Food Waste Reduction>
+<Food Waste Reduction, connectedTo, Dietary Assessment>
+<Genetic Nutrition Counseling, customizes, Meal Planning>
+<Hydration Planning, connectedTo, Food Fortification Strategies>
+<Meal Planning, regulates, Food Label Interpretation>
diff --git a/test/graphviz/scanned_hard/graphviz_85.dot b/test/graphviz/scanned_hard/graphviz_85.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5ef9b60abd4686fcd970034b5ee2e7b265138927
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_85.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=LR
+	N0 [label="Balance and Coordination" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label="Wearable Fitness Devices" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N2 [label="Youth Fitness Programs" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N3 [label="Sports_Specific Training" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N4 [label="Fitness Equipment Maintenance" color="#FFC2C2" fillcolor="#FFEBEB" shape=diamond style=filled]
+	N5 [label="Nutrition for Fitness" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N6 [label="Biometric Feedback Integration" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N7 [label="Workout Planning" color="#FFC2C2" fillcolor="#FFEBEB" shape=plaintext style=filled]
+	N8 [label="Endurance Training" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N0 -> N1 [label=engages color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=stretches color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=improves color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=tracks color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=conditions color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=exercises color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N0 -> N7 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_85.txt b/test/graphviz/scanned_hard/graphviz_85.txt
new file mode 100644
index 0000000000000000000000000000000000000000..53807ed2a0a3795c10151a000b65533d8e0dd792
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_85.txt
@@ -0,0 +1,9 @@
+<Balance and Coordination, connectedTo, Workout Planning>
+<Balance and Coordination, engages, Wearable Fitness Devices>
+<Biometric Feedback Integration, exercises, Workout Planning>
+<Fitness Equipment Maintenance, conditions, Nutrition for Fitness>
+<Nutrition for Fitness, connectedTo, Biometric Feedback Integration>
+<Sports_Specific Training, tracks, Fitness Equipment Maintenance>
+<Wearable Fitness Devices, stretches, Youth Fitness Programs>
+<Workout Planning, connectedTo, Endurance Training>
+<Youth Fitness Programs, improves, Sports_Specific Training>
diff --git a/test/graphviz/scanned_hard/graphviz_87.dot b/test/graphviz/scanned_hard/graphviz_87.dot
new file mode 100644
index 0000000000000000000000000000000000000000..174a709af82e88130a7203ac94b6ee8b4d90a83a
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_87.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=TD
+	N0 [label="Concept Development" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N1 [label="Furniture Selection" color="#FFC107" fillcolor="#FFECB3" shape=octagon style=filled]
+	N2 [label="Art and Accessory Curation" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N3 [label="Ventilation Planning" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N4 [label="3D Rendering" color="#FFC107" fillcolor="#FFECB3" shape=folder style=filled]
+	N5 [label="Material and Finish Specification" color="#2196F3" fillcolor="#BBDEFB" shape=folder style=filled]
+	N6 [label="CAD Drafting" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N7 [label="Smart Home Technology Integration" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N0 -> N1 [label=photographs color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=measures color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=visualizes color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=sketches color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N1 [label=selects color="#FFC107" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_87.txt b/test/graphviz/scanned_hard/graphviz_87.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c49df055196f1ec3a84928cf7832c34142fdfada
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_87.txt
@@ -0,0 +1,8 @@
+<3D Rendering, sketches, Material and Finish Specification>
+<Art and Accessory Curation, measures, Ventilation Planning>
+<CAD Drafting, connectedTo, Smart Home Technology Integration>
+<Concept Development, photographs, Furniture Selection>
+<Furniture Selection, connectedTo, Art and Accessory Curation>
+<Material and Finish Specification, connectedTo, CAD Drafting>
+<Material and Finish Specification, selects, Furniture Selection>
+<Ventilation Planning, visualizes, 3D Rendering>
diff --git a/test/graphviz/scanned_hard/graphviz_88.dot b/test/graphviz/scanned_hard/graphviz_88.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9d1b9f39d47aaa913ca8567a72cdd5aa37c1dbd3
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_88.dot
@@ -0,0 +1,28 @@
+digraph {
+	rankdir=BT
+	N0 [label="Speaker Diarization" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N1 [label="Custom Vocabulary Integration" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N2 [label="Continuous Learning Models for Translation" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N3 [label="Subtitling Generation" color="#4DD0E1" fillcolor="#C9F0F0" shape=Mdiamond style=filled]
+	N4 [label="Glossary Management" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N5 [label="Cross_Lingual Communication" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N6 [label="Legal Document Translation" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N7 [label="Rule_Based Machine Translation" color="#4DD0E1" fillcolor="#C9F0F0" shape=octagon style=filled]
+	N8 [label="Emotion Detection in Speech" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N9 [label="Tone Recognition" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N10 [label="Medical Translation" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N11 [label="Domain_Specific Translation Models" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N0 -> N1 [label=supports color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=corrects color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=interprets color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=tests color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=translates color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=adapts color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N2 -> N5 [label=develops color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N7 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_88.txt b/test/graphviz/scanned_hard/graphviz_88.txt
new file mode 100644
index 0000000000000000000000000000000000000000..954553e2bd9476e7e1b1a1090d1b3c281e84b3f9
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_88.txt
@@ -0,0 +1,13 @@
+<Continuous Learning Models for Translation, connectedTo, Rule_Based Machine Translation>
+<Continuous Learning Models for Translation, corrects, Subtitling Generation>
+<Continuous Learning Models for Translation, develops, Cross_Lingual Communication>
+<Cross_Lingual Communication, connectedTo, Legal Document Translation>
+<Custom Vocabulary Integration, connectedTo, Continuous Learning Models for Translation>
+<Emotion Detection in Speech, adapts, Tone Recognition>
+<Glossary Management, tests, Cross_Lingual Communication>
+<Legal Document Translation, connectedTo, Rule_Based Machine Translation>
+<Medical Translation, connectedTo, Domain_Specific Translation Models>
+<Rule_Based Machine Translation, translates, Emotion Detection in Speech>
+<Speaker Diarization, supports, Custom Vocabulary Integration>
+<Subtitling Generation, interprets, Glossary Management>
+<Tone Recognition, connectedTo, Medical Translation>
diff --git a/test/graphviz/scanned_hard/graphviz_89.dot b/test/graphviz/scanned_hard/graphviz_89.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8cd57c52b2414df54ff2d2e36852ce8ddaa68694
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_89.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=BT
+	N0 [label="Communication Systems" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N1 [label="Drone Delivery Logistics" color="#CB9BE1" fillcolor="#F2E6F5" shape=octagon style=filled]
+	N2 [label="Geofencing Implementation" color="#CB9BE1" fillcolor="#F2E6F5" shape=oval style=filled]
+	N3 [label="Urban Air Mobility Planning" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N4 [label=Videography color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N5 [label="Propeller Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N6 [label="Endurance Optimization" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N7 [label="Remote Piloting Training" color="#66BB6A" fillcolor="#E8F5E9" shape=oval style=filled]
+	N8 [label="Drone Data Security" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N9 [label="Ethical Drone Use" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N0 -> N1 [label=builds color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=delivers color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=manufactures color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=secures color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=flies color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N5 [label=licenses color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_89.txt b/test/graphviz/scanned_hard/graphviz_89.txt
new file mode 100644
index 0000000000000000000000000000000000000000..32b20e23d85a449e27074492d588ec63077d6f83
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_89.txt
@@ -0,0 +1,11 @@
+<Communication Systems, builds, Drone Delivery Logistics>
+<Drone Data Security, connectedTo, Ethical Drone Use>
+<Drone Delivery Logistics, connectedTo, Geofencing Implementation>
+<Endurance Optimization, connectedTo, Remote Piloting Training>
+<Ethical Drone Use, licenses, Propeller Design>
+<Geofencing Implementation, delivers, Urban Air Mobility Planning>
+<Propeller Design, connectedTo, Endurance Optimization>
+<Propeller Design, connectedTo, Remote Piloting Training>
+<Remote Piloting Training, flies, Drone Data Security>
+<Urban Air Mobility Planning, manufactures, Videography>
+<Videography, secures, Propeller Design>
diff --git a/test/graphviz/scanned_hard/graphviz_9.txt b/test/graphviz/scanned_hard/graphviz_9.txt
new file mode 100644
index 0000000000000000000000000000000000000000..39b3aee77aaf765d954b4f7c26b14a1b5ce90162
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_9.txt
@@ -0,0 +1,11 @@
+<Carrier Selection, loads, Hub Transfer>
+<Container Loading, sorts, Ocean Freight Management>
+<Customs Clearance, connectedTo, Pickup Request>
+<Hub Transfer, analyzes, Ocean Freight Management>
+<Hub Transfer, connectedTo, Customs Clearance>
+<Inventory Sync, connectedTo, Carrier Selection>
+<Last_mile Dispatch, connectedTo, Vehicle Loading>
+<Last_mile Dispatch, secures, Pickup Request>
+<Pickup Request, connectedTo, Warehouse Entry>
+<Vehicle Loading, connectedTo, Inventory Sync>
+<Warehouse Entry, delivers, Container Loading>
diff --git a/test/graphviz/scanned_hard/graphviz_90.txt b/test/graphviz/scanned_hard/graphviz_90.txt
new file mode 100644
index 0000000000000000000000000000000000000000..eb92a52d1637a8494e9d52c8ceb5debe0554cc10
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_90.txt
@@ -0,0 +1,10 @@
+<Accident Reconstruction for AVs, connectedTo, Sensor Integration>
+<Battery Management for EVs, certifies, Simulation Environment Development>
+<Battery Management for EVs, connectedTo, Accident Reconstruction for AVs>
+<Charging Infrastructure, connectedTo, Remote Operation Capability>
+<Fail_Safe Systems, manufactures, Data Collection and Annotation>
+<Remote Operation Capability, connectedTo, Battery Management for EVs>
+<Sensor Integration, connectedTo, Charging Infrastructure>
+<Simulation Environment Development, upgrades, Fail_Safe Systems>
+<Software Development, controls, Accident Reconstruction for AVs>
+<Vehicle_to_Vehicle Communication, diagnoses, Software Development>
diff --git a/test/graphviz/scanned_hard/graphviz_91.dot b/test/graphviz/scanned_hard/graphviz_91.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d5fda1983213f027d3df435fe6017d8bbaaeb018
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_91.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=RL
+	N0 [label="Carbon Emission Tracking" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N1 [label="Parking Integration" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N2 [label="Scooter_sharing Services" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+	N3 [label="User Registration" color="#FFF9AE" fillcolor="#FFFCE6" shape=octagon style=filled]
+	N4 [label="Dynamic Pricing" color="#B0C5CD" fillcolor="#DFE7EB" shape=oval style=filled]
+	N5 [label="User Rating and Feedback Systems" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N6 [label="Autonomous Shared Vehicles" color="#FFF9AE" fillcolor="#FFFCE6" shape=oval style=filled]
+	N7 [label="Vehicle Booking" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N0 -> N1 [label=forecasts color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=dispatches color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=licenses color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=locates color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N2 [label=rates color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_91.txt b/test/graphviz/scanned_hard/graphviz_91.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6af9956a83b0b15e547e84512832ed20ab2c2f86
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_91.txt
@@ -0,0 +1,8 @@
+<Autonomous Shared Vehicles, connectedTo, Vehicle Booking>
+<Carbon Emission Tracking, forecasts, Parking Integration>
+<Dynamic Pricing, connectedTo, User Rating and Feedback Systems>
+<Parking Integration, dispatches, Scooter_sharing Services>
+<Scooter_sharing Services, licenses, User Registration>
+<User Rating and Feedback Systems, locates, Autonomous Shared Vehicles>
+<User Registration, connectedTo, Dynamic Pricing>
+<Vehicle Booking, rates, Scooter_sharing Services>
diff --git a/test/graphviz/scanned_hard/graphviz_92.dot b/test/graphviz/scanned_hard/graphviz_92.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f00f6f74bc47ae1fdd55632bb62bd7c1d6bb48a3
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_92.dot
@@ -0,0 +1,20 @@
+digraph {
+	rankdir=TD
+	N0 [label="Integration with Navigation Apps" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N1 [label="Space Detection" color="#E57373" fillcolor="#FFEBEE" shape=parallelogram style=filled]
+	N2 [label="Automated Parking Garages" color="#7E57C2" fillcolor="#EDE7F6" shape=Mdiamond style=filled]
+	N3 [label="Billing and Reconciliation" color="#E57373" fillcolor="#FFEBEE" shape=folder style=filled]
+	N4 [label="Data Analytics for Parking Usage" color="#7E57C2" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N5 [label="License Plate Recognition" color="#7E57C2" fillcolor="#EDE7F6" shape=octagon style=filled]
+	N6 [label="Valet Parking Automation" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N7 [label="User Experience Design for Apps" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=sells color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=displays color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=manages color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=processes color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N5 [label=certifies color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N6 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_94.txt b/test/graphviz/scanned_hard/graphviz_94.txt
new file mode 100644
index 0000000000000000000000000000000000000000..33a9ac502e2197fed88561d4b248abe854256042
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_94.txt
@@ -0,0 +1,9 @@
+<Anonymous Credential Systems, connectedTo, Touchscreen Voting Machines>
+<Auditability, audits, Ballot Creation>
+<Ballot Creation, alerts, Remote Voting Solutions>
+<Remote Voting Solutions, casts, Voter Authentication>
+<Software Integrity Checks, connectedTo, Anonymous Credential Systems>
+<System Certification, connectedTo, Auditability>
+<System Certification, resists, Touchscreen Voting Machines>
+<Touchscreen Voting Machines, communicates, System Certification>
+<Voter Authentication, develops, Accessibility Features>
diff --git a/test/graphviz/scanned_hard/graphviz_95.dot b/test/graphviz/scanned_hard/graphviz_95.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5a41041b85f4bd6c01d93a0acc4c4122f682ec56
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_95.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=LR
+	N0 [label="Quantitative Analysis" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N1 [label="Non_profit Policy Influence" color="#03A9F4" fillcolor="#B3E5FC" shape=oval style=filled]
+	N2 [label="Option Generation" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N3 [label="Communication Strategy" color="#80DDEA" fillcolor="#D3F7F9" shape=oval style=filled]
+	N4 [label="Problem Identification" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N5 [label="Impact Assessment" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N6 [label="Monitoring and Evaluation Framework" color="#A188DB" fillcolor="#DED7F0" shape=parallelogram style=filled]
+	N7 [label="Policy Advocacy and Lobbying" color="#A188DB" fillcolor="#DED7F0" shape=plaintext style=filled]
+	N8 [label="Political Feasibility Assessment" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N0 -> N1 [label=influences color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=synthesizes color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=trains color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=audits color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=communicates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N5 -> N7 [label=reviews color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_95.txt b/test/graphviz/scanned_hard/graphviz_95.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ffc7c4fba1db36b799f1642434916aa742ee75d3
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_95.txt
@@ -0,0 +1,9 @@
+<Communication Strategy, audits, Problem Identification>
+<Impact Assessment, connectedTo, Monitoring and Evaluation Framework>
+<Impact Assessment, reviews, Policy Advocacy and Lobbying>
+<Monitoring and Evaluation Framework, connectedTo, Policy Advocacy and Lobbying>
+<Non_profit Policy Influence, synthesizes, Option Generation>
+<Option Generation, trains, Communication Strategy>
+<Policy Advocacy and Lobbying, connectedTo, Political Feasibility Assessment>
+<Problem Identification, communicates, Impact Assessment>
+<Quantitative Analysis, influences, Non_profit Policy Influence>
diff --git a/test/graphviz/scanned_hard/graphviz_96.dot b/test/graphviz/scanned_hard/graphviz_96.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5b623daa31da06cc65fb65427dce65ff0d0d7a30
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_96.dot
@@ -0,0 +1,28 @@
+digraph {
+	rankdir=LR
+	N0 [label="Bias Mitigation" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N1 [label="Research Question Refinement" color="#FFC2C2" fillcolor="#FFEBEB" shape=parallelogram style=filled]
+	N2 [label="Theory Development" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N3 [label=Meta_Analysis color="#FFC2C2" fillcolor="#FFEBEB" shape=oval style=filled]
+	N4 [label="Variable Identification" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N5 [label="Citation Management" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N6 [label="Peer Review Process" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N7 [label="Literature Review" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+	N8 [label="Systematic Review" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N9 [label="Research Impact Assessment" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N10 [label="Poster Session Preparation" color="#FFC2C2" fillcolor="#FFEBEB" shape=diamond style=filled]
+	N11 [label="Reproducibility Studies" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N0 -> N1 [label=integrity color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=disseminates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="open science" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=validates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=licenses color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=reviews color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=submits color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_96.txt b/test/graphviz/scanned_hard/graphviz_96.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2c025f4d6851e589f05d3d9e11abf316a8a79fc1
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_96.txt
@@ -0,0 +1,13 @@
+<Bias Mitigation, integrity, Research Question Refinement>
+<Citation Management, validates, Peer Review Process>
+<Literature Review, connectedTo, Systematic Review>
+<Meta_Analysis, connectedTo, Variable Identification>
+<Peer Review Process, licenses, Literature Review>
+<Poster Session Preparation, submits, Reproducibility Studies>
+<Reproducibility Studies, connectedTo, Literature Review>
+<Research Impact Assessment, connectedTo, Poster Session Preparation>
+<Research Question Refinement, disseminates, Theory Development>
+<Systematic Review, reviews, Research Impact Assessment>
+<Theory Development, open science, Meta_Analysis>
+<Variable Identification, connectedTo, Citation Management>
+<Variable Identification, connectedTo, Literature Review>
diff --git a/test/graphviz/scanned_hard/graphviz_97.txt b/test/graphviz/scanned_hard/graphviz_97.txt
new file mode 100644
index 0000000000000000000000000000000000000000..eddcf8c72371b832dfeb081429c9a641189aa488
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_97.txt
@@ -0,0 +1,10 @@
+<Circulation Management, borrows, Technical Support for Systems>
+<Collection Development, educates, Subject Indexing>
+<Data Migration, collaborates, Collection Development>
+<Library Website Management, connectedTo, Data Migration>
+<Patron Services, connectedTo, System Upgrades>
+<Serials Control, connectedTo, Patron Services>
+<Serials Control, connectedTo, System Upgrades>
+<Subject Indexing, trains, Circulation Management>
+<System Upgrades, connectedTo, Discovery Layers>
+<Technical Support for Systems, develops, Serials Control>
diff --git a/test/graphviz/scanned_hard/graphviz_99.dot b/test/graphviz/scanned_hard/graphviz_99.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fa55243aec85c39907feb98e8533882a590e4cfc
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_99.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=RL
+	N0 [label="Collection Digitization" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N1 [label="Conservation Technology" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N2 [label="Security Systems Integration" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N3 [label="User Experience Design" color="#795548" fillcolor="#D7CCC8" shape=folder style=filled]
+	N4 [label="Content Management Systems" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N5 [label="Interactive Display Development" color="#795548" fillcolor="#D7CCC8" shape=oval style=filled]
+	N6 [label="Virtual Reality Experiences" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N7 [label="Ticketing and Visitor Systems" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N0 -> N1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=entertains color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=communicates color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=exhibits color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=audits color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=educates color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N3 -> N0 [label=models color="#A1887F" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_hard/graphviz_99.txt b/test/graphviz/scanned_hard/graphviz_99.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a1ad28344fff3aead6a976c0969baff417b22f37
--- /dev/null
+++ b/test/graphviz/scanned_hard/graphviz_99.txt
@@ -0,0 +1,8 @@
+<Collection Digitization, connectedTo, Conservation Technology>
+<Conservation Technology, entertains, Security Systems Integration>
+<Content Management Systems, audits, Interactive Display Development>
+<Interactive Display Development, connectedTo, Virtual Reality Experiences>
+<Security Systems Integration, communicates, User Experience Design>
+<User Experience Design, exhibits, Content Management Systems>
+<User Experience Design, models, Collection Digitization>
+<Virtual Reality Experiences, educates, Ticketing and Visitor Systems>