diff --git a/test/diagrams/graph_hard/diagrams_1.dot b/test/diagrams/graph_hard/diagrams_1.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d63fe4b0a537b986def7f2ff97f5d77436d78b46
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_1.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=LR
+	N0 [label="AML Screening" color="#90A4AE" fillcolor="#ECEFF1" shape=predefinedprocess style=filled]
+	N1 [label="Financial Reporting" color="#90A4AE" fillcolor="#ECEFF1" shape=inputoutput style=filled]
+	N2 [label="KYC Validation" color="#90A4AE" fillcolor="#ECEFF1" shape=rect style=filled]
+	N3 [label="Underwriting" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N4 [label="Transaction Logging" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N5 [label="Payment Gateway Integration" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N6 [label="Investment Planning" color="#E57373" fillcolor="#FFEBEE" shape=rect style=filled]
+	N7 [label="Financial Advisory" color="#90A4AE" fillcolor="#ECEFF1" shape=rect style=filled]
+	N8 [label="Securities Trading" color="#90A4AE" fillcolor="#ECEFF1" shape=action style=filled]
+	N9 [label="Treasury Management" color="#AB47BC" fillcolor="#F3E5F5" shape=rect style=filled]
+	N10 [label="IPO Launch" color="#AB47BC" fillcolor="#F3E5F5" shape=preparation style=filled]
+	N11 [label="Transaction Audit" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N12 [label="Credit Card Application" color="#E57373" fillcolor="#FFEBEE" shape=inputoutput style=filled]
+	S0 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Wealth Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Wealth Management"
+		nest0_0 [label="Budgeting Analysis" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest0_1 [label="Approval Decision" color="#90A4AE" fillcolor="#ECEFF1" shape=document style=filled]
+	}
+	subgraph cluster_Debt Collection {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Debt Collection"
+		nest1_0 [label="Credit Scoring" color="#90A4AE" fillcolor="#ECEFF1" shape=document style=filled]
+		nest1_1 [label="Cryptocurrency Exchange" color="#E57373" fillcolor="#FFEBEE" shape=database style=filled]
+	}
+	N0 -> N1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#E57373" penwidth=1.5 style=solid label="reports" dir=forward]
+	nest0_0 -> nest0_1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest1_0 [color="#E57373" penwidth=1.5 style=solid label="screens" dir=forward]
+	nest1_1 -> N6 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#AB47BC" penwidth=1.5 style=dashed label="analyzes" dir=forward]
+	N5 -> M1 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N10 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_1.txt b/test/diagrams/graph_hard/diagrams_1.txt
new file mode 100644
index 0000000000000000000000000000000000000000..18bc7b997bccd1a0270c95f4c296b841a0f530c3
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_1.txt
@@ -0,0 +1,25 @@
+<AML Screening, analyzes, IPO Launch>
+<AML Screening, connectedTo, Financial Reporting>
+<Approval Decision, connectedTo, Treasury Management>
+<Budgeting Analysis, connectedTo, Approval Decision>
+<Credit Scoring, connectedTo, Cryptocurrency Exchange>
+<Cryptocurrency Exchange, connectedTo, Investment Planning>
+<Financial Advisory, connectedTo, Credit Card Application>
+<Financial Advisory, connectedTo, Securities Trading>
+<Financial Advisory, connectedTo, Treasury Management>
+<Financial Reporting, connectedTo, Credit Card Application>
+<Financial Reporting, connectedTo, Financial Advisory>
+<Financial Reporting, connectedTo, KYC Validation>
+<IPO Launch, connectedTo, Transaction Audit>
+<Investment Planning, connectedTo, Financial Advisory>
+<Investment Planning, screens, Credit Scoring>
+<KYC Validation, connectedTo, IPO Launch>
+<KYC Validation, connectedTo, Underwriting>
+<Payment Gateway Integration, connectedTo, IPO Launch>
+<Payment Gateway Integration, connectedTo, Investment Planning>
+<Securities Trading, connectedTo, Treasury Management>
+<Transaction Audit, reports, Credit Card Application>
+<Transaction Logging, connectedTo, Payment Gateway Integration>
+<Treasury Management, connectedTo, Budgeting Analysis>
+<Treasury Management, connectedTo, IPO Launch>
+<Underwriting, connectedTo, Transaction Logging>
diff --git a/test/diagrams/graph_hard/diagrams_10.dot b/test/diagrams/graph_hard/diagrams_10.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6f1d4a8af9501ebf3251e850597d0edf8b228aee
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_10.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=TB
+	N0 [label="Graduation Approval" color="#BDAFA8" fillcolor="#E4E0DF" shape=database style=filled]
+	N1 [label="Research Grant Application" color="#81C784" fillcolor="#F1F8E9" shape=inputoutput style=filled]
+	N2 [label="Special Education Support" color="#BDAFA8" fillcolor="#E4E0DF" shape=rectangle style=filled]
+	N3 [label="Alumni Network Management" color="#FFDA4E" fillcolor="#FFE88D" shape=vnode_shape style=filled]
+	N4 [label="Document Verification" color="#FFDA4E" fillcolor="#FFE88D" shape=action style=filled]
+	N5 [label="Scholarship Evaluation" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N6 [label="Peer Tutoring" color="#BDAFA8" fillcolor="#E4E0DF" shape=parallelogram style=filled]
+	N7 [label="Field Trip Coordination" color="#FFDA4E" fillcolor="#FFE88D" shape=diamond style=filled]
+	N8 [label="Internship Coordination" color="#FFDA4E" fillcolor="#FFE88D" shape=inputoutput style=filled]
+	N9 [label="Course Selection" color="#FFDA4E" fillcolor="#FFE88D" shape=diamond style=filled]
+	N10 [label="Club Registration" color="#BDAFA8" fillcolor="#E4E0DF" shape=multipledocuments style=filled]
+	N11 [label="Online Learning Platform Management" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N12 [label="Transcript Issuance" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	S0 [label="" color="#BDAFA8" fillcolor="#E4E0DF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#81C784" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#81C784" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#BDAFA8" fillcolor="#E4E0DF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Advisory Committee Meeting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Advisory Committee Meeting"
+		nest0_0 [label="Parent_Teacher Conference" color="#FFDA4E" fillcolor="#FFE88D" shape=preparation style=filled]
+		nest0_1 [label="School Accreditation" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+		nest0_2 [label="Certificate Issuance" color="#81C784" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+		nest0_3 [label="Extracurricular Activity" color="#FFDA4E" fillcolor="#FFE88D" shape=preparation style=filled]
+	}
+	subgraph cluster_Disciplinary Action {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Disciplinary Action"
+		nest1_0 [label="Thesis Submission" color="#FFDA4E" fillcolor="#FFE88D" shape=action style=filled]
+		nest1_1 [label="Exam Conduct" color="#FFDA4E" fillcolor="#FFE88D" shape=document style=filled]
+	}
+	N0 -> N1 [color="#FFDA4E" penwidth=1.5 style=solid label="updates" dir=forward]
+	N1 -> N2 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest0_0 [color="#BDAFA8" penwidth=1.5 style=dashed label="licenses" dir=forward]
+	nest0_3 -> N4 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N10 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S0 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+	N2 -> S2 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#FFDA4E" penwidth=1.5 style=solid label="administers" dir=forward]
+	N3 -> M1 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	M1 -> N11 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N5 -> M2 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> M2 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	M2 -> N10 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_100.dot b/test/diagrams/graph_hard/diagrams_100.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f1961fb44ba550dfc33016f16aa2da0d824e1466
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_100.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=RL
+	N0 [label="Freelancer Engagement" color="#82DAFF" fillcolor="#C8EDFF" shape=parallelogram style=filled]
+	N1 [label="Candidate Experience Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N2 [label="Recruiter Training" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N3 [label="Internal Mobility" color="#AB47BC" fillcolor="#F3E5F5" shape=inputoutput style=filled]
+	N4 [label="Candidate Relationship Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N5 [label="Video Interviewing" color="#82DAFF" fillcolor="#C8EDFF" shape=vnode_shape style=filled]
+	N6 [label="Contingent Workforce Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=predefinedprocess style=filled]
+	N7 [label="Candidate Screening" color="#AB47BC" fillcolor="#F3E5F5" shape=multipledocuments style=filled]
+	N8 [label="Executive Search" color="#AB47BC" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N9 [label="Competency_Based Interviewing" color="#AB47BC" fillcolor="#F3E5F5" shape=action style=filled]
+	N10 [label="Candidate Tracking" color="#AB47BC" fillcolor="#F3E5F5" shape=database style=filled]
+	N11 [label="Talent Pipeline Building" color="#82DAFF" fillcolor="#C8EDFF" shape=database style=filled]
+	S0 [label="" color="#82DAFF" fillcolor="#C8EDFF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AB47BC" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Interview Panel Coordination {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Interview Panel Coordination"
+		nest0_0 [label="Background Check" color="#82DAFF" fillcolor="#C8EDFF" shape=rectangle style=filled]
+		nest0_1 [label="Interview Conducting" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+		nest0_2 [label="Negotiation" color="#82DAFF" fillcolor="#C8EDFF" shape=document style=filled]
+		nest0_3 [label="Job Description Creation" color="#AB47BC" fillcolor="#F3E5F5" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Temporary Staffing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Temporary Staffing"
+		nest1_0 [label="Global Recruitment Strategy" color="#82DAFF" fillcolor="#C8EDFF" shape=predefinedprocess style=filled]
+		nest1_1 [label="Job Fair Organization" color="#82DAFF" fillcolor="#C8EDFF" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N11 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N3 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#FFEB3B" penwidth=1.5 style=solid label="screens" dir=forward]
+	N3 -> S1 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#FFEB3B" penwidth=1.5 style=solid label="builds" dir=forward]
+	N3 -> M0 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid label="onboards" dir=forward]
+	M0 -> N5 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N6 -> M2 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_100.txt b/test/diagrams/graph_hard/diagrams_100.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6fa17c943f1ff476d37555bc70b9132887de5f32
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_100.txt
@@ -0,0 +1,31 @@
+<Background Check, connectedTo, Interview Conducting>
+<Candidate Experience Management, builds, Video Interviewing>
+<Candidate Experience Management, connectedTo, Candidate Tracking>
+<Candidate Experience Management, connectedTo, Global Recruitment Strategy>
+<Candidate Experience Management, connectedTo, Recruiter Training>
+<Candidate Relationship Management, connectedTo, Video Interviewing>
+<Candidate Screening, connectedTo, Executive Search>
+<Candidate Tracking, connectedTo, Talent Pipeline Building>
+<Competency_Based Interviewing, connectedTo, Candidate Tracking>
+<Contingent Workforce Management, connectedTo, Background Check>
+<Contingent Workforce Management, connectedTo, Candidate Screening>
+<Contingent Workforce Management, connectedTo, Candidate Tracking>
+<Executive Search, connectedTo, Competency_Based Interviewing>
+<Freelancer Engagement, connectedTo, Candidate Experience Management>
+<Freelancer Engagement, connectedTo, Video Interviewing>
+<Global Recruitment Strategy, connectedTo, Job Fair Organization>
+<Internal Mobility, connectedTo, Candidate Relationship Management>
+<Internal Mobility, connectedTo, Candidate Tracking>
+<Internal Mobility, connectedTo, Competency_Based Interviewing>
+<Internal Mobility, connectedTo, Contingent Workforce Management>
+<Internal Mobility, connectedTo, Executive Search>
+<Internal Mobility, connectedTo, Talent Pipeline Building>
+<Internal Mobility, connectedTo, Video Interviewing>
+<Internal Mobility, screens, Competency_Based Interviewing>
+<Interview Conducting, connectedTo, Negotiation>
+<Job Description Creation, connectedTo, Talent Pipeline Building>
+<Job Fair Organization, connectedTo, Internal Mobility>
+<Negotiation, connectedTo, Job Description Creation>
+<Recruiter Training, connectedTo, Internal Mobility>
+<Recruiter Training, onboards, Video Interviewing>
+<Video Interviewing, connectedTo, Contingent Workforce Management>
diff --git a/test/diagrams/graph_hard/diagrams_101.dot b/test/diagrams/graph_hard/diagrams_101.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5813ba05cf1443da7f88b5649801277455dcfd42
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_101.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=BT
+	N0 [label="Recruiter Training" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N1 [label="Social Recruiting" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N2 [label="Job Fair Organization" color="#D2D2D2" fillcolor="#F0F0F0" shape=predefinedprocess style=filled]
+	N3 [label="Competency_Based Interviewing" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N4 [label="Candidate Assessment Design" color="#3F51B5" fillcolor="#C5CAE9" shape=inputoutput style=filled]
+	N5 [label="Psychometric Testing" color="#D2D2D2" fillcolor="#F0F0F0" shape=diamond style=filled]
+	N6 [label="Recruitment Analytics" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N7 [label="Campus Recruitment" color="#D2D2D2" fillcolor="#F0F0F0" shape=predefinedprocess style=filled]
+	S0 [label="" color="#D2D2D2" fillcolor="#F0F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#D2D2D2" fillcolor="#F0F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Contingent Workforce Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Contingent Workforce Management"
+		nest0_0 [label="Interview Conducting" color="#E57373" fillcolor="#FFEBEE" shape=preparation style=filled]
+		nest0_1 [label="Job Description Creation" color="#D2D2D2" fillcolor="#F0F0F0" shape=rectangle style=filled]
+		nest0_2 [label="Executive Search" color="#E57373" fillcolor="#FFEBEE" shape=action style=filled]
+		nest0_3 [label="Temporary Staffing" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	}
+	subgraph cluster_Onboarding Handoff {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Onboarding Handoff"
+		nest1_0 [label="Recruitment Metrics Reporting" color="#D2D2D2" fillcolor="#F0F0F0" shape=document style=filled]
+		nest1_1 [label="Passive Candidate Engagement" color="#3F51B5" fillcolor="#C5CAE9" shape=preparation style=filled]
+		nest1_2 [label="Recruitment Marketing" color="#E57373" fillcolor="#FFEBEE" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#D2D2D2" penwidth=1.5 style=solid label="assesses" dir=forward]
+	N3 -> N4 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N7 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest1_0 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N2 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#000000" penwidth=1.5 style=solid label="personalizes" dir=forward]
+	S1 -> N6 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N3 -> S2 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N7 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	M2 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_101.txt b/test/diagrams/graph_hard/diagrams_101.txt
new file mode 100644
index 0000000000000000000000000000000000000000..201565ff6dcc93fb90d03abdee1082a241c59678
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_101.txt
@@ -0,0 +1,25 @@
+<Candidate Assessment Design, connectedTo, Campus Recruitment>
+<Candidate Assessment Design, connectedTo, Psychometric Testing>
+<Candidate Assessment Design, connectedTo, Recruitment Analytics>
+<Competency_Based Interviewing, connectedTo, Campus Recruitment>
+<Competency_Based Interviewing, connectedTo, Candidate Assessment Design>
+<Competency_Based Interviewing, connectedTo, Psychometric Testing>
+<Competency_Based Interviewing, connectedTo, Recruitment Analytics>
+<Competency_Based Interviewing, connectedTo, Recruitment Metrics Reporting>
+<Executive Search, connectedTo, Temporary Staffing>
+<Interview Conducting, connectedTo, Job Description Creation>
+<Job Description Creation, connectedTo, Executive Search>
+<Job Fair Organization, assesses, Competency_Based Interviewing>
+<Job Fair Organization, connectedTo, Psychometric Testing>
+<Passive Candidate Engagement, connectedTo, Recruitment Marketing>
+<Psychometric Testing, connectedTo, Interview Conducting>
+<Psychometric Testing, connectedTo, Recruitment Analytics>
+<Recruiter Training, connectedTo, Social Recruiting>
+<Recruitment Analytics, connectedTo, Campus Recruitment>
+<Recruitment Marketing, connectedTo, Job Fair Organization>
+<Recruitment Metrics Reporting, connectedTo, Passive Candidate Engagement>
+<Social Recruiting, connectedTo, Candidate Assessment Design>
+<Social Recruiting, connectedTo, Job Fair Organization>
+<Social Recruiting, connectedTo, Recruitment Analytics>
+<Social Recruiting, personalizes, Psychometric Testing>
+<Temporary Staffing, connectedTo, Campus Recruitment>
diff --git a/test/diagrams/graph_hard/diagrams_102.dot b/test/diagrams/graph_hard/diagrams_102.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a33d8c75d2a6565a7361dbe5fa450fb3cac4e095
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_102.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=BT
+	N0 [label="Candidate Feedback Collection" color="#4CAF50" fillcolor="#C8E6C9" shape=rectangle style=filled]
+	N1 [label="Candidate Relationship Management" color="#EAEFA5" fillcolor="#FDFCEB" shape=multipledocuments style=filled]
+	N2 [label="Campus Recruitment" color="#388E3C" fillcolor="#C8E6C9" shape=predefinedprocess style=filled]
+	N3 [label="Employee Referral Program" color="#EAEFA5" fillcolor="#FDFCEB" shape=document style=filled]
+	N4 [label="Negotiation" color="#388E3C" fillcolor="#C8E6C9" shape=predefinedprocess style=filled]
+	N5 [label="Contingent Workforce Management" color="#4CAF50" fillcolor="#C8E6C9" shape=rectangle style=filled]
+	N6 [label="Internal Mobility" color="#EAEFA5" fillcolor="#FDFCEB" shape=action style=filled]
+	N7 [label="Background Check" color="#4CAF50" fillcolor="#C8E6C9" shape=multipledocuments style=filled]
+	N8 [label="Talent Pipeline Building" color="#388E3C" fillcolor="#C8E6C9" shape=action style=filled]
+	N9 [label="Reference Checking" color="#EAEFA5" fillcolor="#FDFCEB" shape=rectangle style=filled]
+	N10 [label="Candidate Experience Management" color="#EAEFA5" fillcolor="#FDFCEB" shape=predefinedprocess style=filled]
+	N11 [label="Compliance in Hiring" color="#4CAF50" fillcolor="#C8E6C9" shape=rectangle style=filled]
+	N12 [label="Candidate Assessment Design" color="#388E3C" fillcolor="#C8E6C9" shape=predefinedprocess style=filled]
+	N13 [label="Recruitment Analytics" color="#EAEFA5" fillcolor="#FDFCEB" shape=action style=filled]
+	S0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Video Interviewing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Video Interviewing"
+		nest0_0 [label="Temporary Staffing" color="#EAEFA5" fillcolor="#FDFCEB" shape=action style=filled]
+		nest0_1 [label="Candidate Screening" color="#388E3C" fillcolor="#C8E6C9" shape=database style=filled]
+		nest0_2 [label="Social Recruiting" color="#EAEFA5" fillcolor="#FDFCEB" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Employer Branding {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Employer Branding"
+		nest1_0 [label="Psychometric Testing" color="#4CAF50" fillcolor="#C8E6C9" shape=action style=filled]
+		nest1_1 [label="Competency_Based Interviewing" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+		nest1_2 [label="AI in Recruitment" color="#4CAF50" fillcolor="#C8E6C9" shape=diamond style=filled]
+		nest1_3 [label="Diversity Sourcing" color="#388E3C" fillcolor="#C8E6C9" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N9 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#4CAF50" penwidth=1.5 style=dashed label="sources" dir=forward]
+	N5 -> nest1_0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N2 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N0 -> S0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N2 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N4 -> S1 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N10 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	M0 -> N13 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_102.txt b/test/diagrams/graph_hard/diagrams_102.txt
new file mode 100644
index 0000000000000000000000000000000000000000..28f5f8669e9e43ef4f0c8d045817468d79d9c93d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_102.txt
@@ -0,0 +1,30 @@
+<AI in Recruitment, sources, Diversity Sourcing>
+<Background Check, connectedTo, Talent Pipeline Building>
+<Background Check, connectedTo, Temporary Staffing>
+<Campus Recruitment, connectedTo, Employee Referral Program>
+<Candidate Assessment Design, connectedTo, Recruitment Analytics>
+<Candidate Experience Management, connectedTo, Compliance in Hiring>
+<Candidate Experience Management, connectedTo, Recruitment Analytics>
+<Candidate Feedback Collection, connectedTo, Background Check>
+<Candidate Feedback Collection, connectedTo, Campus Recruitment>
+<Candidate Feedback Collection, connectedTo, Candidate Relationship Management>
+<Candidate Feedback Collection, connectedTo, Recruitment Analytics>
+<Candidate Relationship Management, connectedTo, Campus Recruitment>
+<Candidate Screening, connectedTo, Social Recruiting>
+<Competency_Based Interviewing, connectedTo, AI in Recruitment>
+<Compliance in Hiring, connectedTo, Candidate Assessment Design>
+<Contingent Workforce Management, connectedTo, Internal Mobility>
+<Contingent Workforce Management, connectedTo, Psychometric Testing>
+<Diversity Sourcing, connectedTo, Campus Recruitment>
+<Employee Referral Program, connectedTo, Negotiation>
+<Employee Referral Program, connectedTo, Recruitment Analytics>
+<Internal Mobility, connectedTo, Background Check>
+<Negotiation, connectedTo, Candidate Assessment Design>
+<Negotiation, connectedTo, Contingent Workforce Management>
+<Negotiation, connectedTo, Internal Mobility>
+<Negotiation, connectedTo, Recruitment Analytics>
+<Psychometric Testing, connectedTo, Competency_Based Interviewing>
+<Reference Checking, connectedTo, Candidate Experience Management>
+<Social Recruiting, connectedTo, Reference Checking>
+<Talent Pipeline Building, connectedTo, Reference Checking>
+<Temporary Staffing, connectedTo, Candidate Screening>
diff --git a/test/diagrams/graph_hard/diagrams_103.txt b/test/diagrams/graph_hard/diagrams_103.txt
new file mode 100644
index 0000000000000000000000000000000000000000..36ec2293e8afe8bfdbd2f26379525d75fc84f668
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_103.txt
@@ -0,0 +1,26 @@
+<Account Management, connectedTo, Customer Journey Mapping>
+<Account Management, connectedTo, Customer Onboarding Support>
+<Account Management, connectedTo, FAQ Management>
+<Account Management, records, Service Blueprinting>
+<Customer Journey Mapping, connectedTo, Email Support>
+<Customer Journey Mapping, connectedTo, Service Blueprinting>
+<Customer Satisfaction Survey, connectedTo, Customer Onboarding Support>
+<Customer Satisfaction Survey, connectedTo, First Contact Resolution Optimization>
+<Customer Success Management, connectedTo, Product Information Provision>
+<Email Support, connectedTo, Up_selling Opportunities>
+<FAQ Management, connectedTo, Customer Satisfaction Survey>
+<FAQ Management, connectedTo, Service Blueprinting>
+<First Contact Resolution Optimization, connectedTo, Customer Success Management>
+<Inquiry Handling, connectedTo, Customer Journey Mapping>
+<Inquiry Handling, connectedTo, Knowledge Base Creation>
+<Issue Escalation, connectedTo, Customer Journey Mapping>
+<Issue Escalation, connectedTo, Inquiry Handling>
+<Knowledge Base Creation, connectedTo, Account Management>
+<Knowledge Base Creation, connectedTo, Customer Journey Mapping>
+<Order Status Check, connectedTo, Customer Journey Mapping>
+<Order Status Check, connectedTo, Issue Escalation>
+<Product Information Provision, connectedTo, Knowledge Base Creation>
+<Self_Service Portal Management, connectedTo, FAQ Management>
+<Sentiment Analysis, connectedTo, Self_Service Portal Management>
+<Service Blueprinting, connectedTo, FAQ Management>
+<Up_selling Opportunities, connectedTo, Sentiment Analysis>
diff --git a/test/diagrams/graph_hard/diagrams_104.dot b/test/diagrams/graph_hard/diagrams_104.dot
new file mode 100644
index 0000000000000000000000000000000000000000..30d602f84e084908e81e5e17f9764f32fdae5dcc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_104.dot
@@ -0,0 +1,86 @@
+digraph {
+	rankdir=TB
+	N0 [label="Accessibility Support" color="#CD8FF2" fillcolor="#ECCFF5" shape=inputoutput style=filled]
+	N1 [label="Customer Journey Mapping" color="#FFC085" fillcolor="#FFDAB9" shape=document style=filled]
+	N2 [label="Sentiment Analysis" color="#FFC085" fillcolor="#FFDAB9" shape=parallelogram style=filled]
+	N3 [label="Self_Service Portal Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=multipledocuments style=filled]
+	N4 [label="Issue Escalation" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N5 [label="Email Support" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N6 [label="Order Status Check" color="#FFC085" fillcolor="#FFDAB9" shape=vnode_shape style=filled]
+	N7 [label="First Contact Resolution Optimization" color="#BDAFA8" fillcolor="#E4E0DF" shape=rect style=filled]
+	N8 [label="Social Media Response" color="#BDAFA8" fillcolor="#E4E0DF" shape=preparation style=filled]
+	N9 [label="Post_Service Follow_up" color="#FFC085" fillcolor="#FFDAB9" shape=hexagon style=filled]
+	N10 [label="Service Level Agreement Monitoring" color="#FFC085" fillcolor="#FFDAB9" shape=preparation style=filled]
+	N11 [label="Personalized Assistance" color="#FFC085" fillcolor="#FFDAB9" shape=parallelogram style=filled]
+	N12 [label="Virtual Assistant Interaction" color="#CD8FF2" fillcolor="#ECCFF5" shape=multipledocuments style=filled]
+	S0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Refund Processing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Refund Processing"
+		nest0_0 [label="Customer Loyalty Program Support" color="#BDAFA8" fillcolor="#E4E0DF" shape=rectangle style=filled]
+		nest0_1 [label="Complaint Resolution" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+		nest0_2 [label="Cross_selling Opportunities" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+	}
+	subgraph cluster_Account Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Account Management"
+		nest1_0 [label="Service Recovery" color="#BDAFA8" fillcolor="#E4E0DF" shape=multipledocuments style=filled]
+		nest1_1 [label="Live Chat Support" color="#BDAFA8" fillcolor="#E4E0DF" shape=multipledocuments style=filled]
+		nest1_2 [label="FAQ Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed label="automates" dir=forward]
+	N2 -> N3 [color="#CD8FF2" penwidth=1.5 style=solid label="complies" dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFC085" penwidth=1.5 style=solid label="empathizes" dir=forward]
+	N5 -> N6 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#CD8FF2" penwidth=1.5 style=dashed label="optimizes" dir=forward]
+	nest0_0 -> nest0_1 [color="#FFC085" penwidth=1.5 style=dashed label="consults" dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest0_0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N10 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N11 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N7 -> S0 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+	N6 -> S2 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N10 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid label="personals" dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	M1 -> N9 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N6 -> M2 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N12 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_104.txt b/test/diagrams/graph_hard/diagrams_104.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2b5ae4253175907e95dbc52a8d006a6cb98770bc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_104.txt
@@ -0,0 +1,40 @@
+<Accessibility Support, connectedTo, Customer Journey Mapping>
+<Accessibility Support, connectedTo, Service Level Agreement Monitoring>
+<Accessibility Support, personals, Post_Service Follow_up>
+<Complaint Resolution, connectedTo, Cross_selling Opportunities>
+<Cross_selling Opportunities, connectedTo, Service Level Agreement Monitoring>
+<Customer Journey Mapping, automates, Sentiment Analysis>
+<Customer Loyalty Program Support, consults, Complaint Resolution>
+<Email Support, connectedTo, Order Status Check>
+<Email Support, connectedTo, Post_Service Follow_up>
+<Email Support, connectedTo, Service Level Agreement Monitoring>
+<FAQ Management, connectedTo, Personalized Assistance>
+<First Contact Resolution Optimization, connectedTo, Service Level Agreement Monitoring>
+<First Contact Resolution Optimization, connectedTo, Social Media Response>
+<First Contact Resolution Optimization, connectedTo, Virtual Assistant Interaction>
+<Issue Escalation, connectedTo, Post_Service Follow_up>
+<Issue Escalation, connectedTo, Service Level Agreement Monitoring>
+<Issue Escalation, connectedTo, Virtual Assistant Interaction>
+<Issue Escalation, empathizes, Email Support>
+<Live Chat Support, connectedTo, FAQ Management>
+<Order Status Check, connectedTo, First Contact Resolution Optimization>
+<Order Status Check, connectedTo, Personalized Assistance>
+<Order Status Check, connectedTo, Post_Service Follow_up>
+<Order Status Check, connectedTo, Service Level Agreement Monitoring>
+<Order Status Check, connectedTo, Social Media Response>
+<Order Status Check, connectedTo, Virtual Assistant Interaction>
+<Personalized Assistance, optimizes, Virtual Assistant Interaction>
+<Post_Service Follow_up, connectedTo, Service Level Agreement Monitoring>
+<Post_Service Follow_up, connectedTo, Service Recovery>
+<Self_Service Portal Management, connectedTo, Issue Escalation>
+<Self_Service Portal Management, connectedTo, Virtual Assistant Interaction>
+<Sentiment Analysis, complies, Self_Service Portal Management>
+<Sentiment Analysis, connectedTo, First Contact Resolution Optimization>
+<Sentiment Analysis, connectedTo, Issue Escalation>
+<Sentiment Analysis, connectedTo, Personalized Assistance>
+<Sentiment Analysis, connectedTo, Social Media Response>
+<Sentiment Analysis, connectedTo, Virtual Assistant Interaction>
+<Service Level Agreement Monitoring, connectedTo, Personalized Assistance>
+<Service Recovery, connectedTo, Live Chat Support>
+<Social Media Response, connectedTo, Customer Loyalty Program Support>
+<Social Media Response, connectedTo, Post_Service Follow_up>
diff --git a/test/diagrams/graph_hard/diagrams_105.dot b/test/diagrams/graph_hard/diagrams_105.dot
new file mode 100644
index 0000000000000000000000000000000000000000..17ec18bead7f764b711c9ec9df69d6d3cc612f04
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_105.dot
@@ -0,0 +1,89 @@
+digraph {
+	rankdir=RL
+	N0 [label="Email Support" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N1 [label="Knowledge Base Creation" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+	N2 [label="Order Status Check" color="#CB9BE1" fillcolor="#F2E6F5" shape=rectangle style=filled]
+	N3 [label="Service Blueprinting" color="#CB9BE1" fillcolor="#F2E6F5" shape=database style=filled]
+	N4 [label="Complaint Trend Analysis" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+	N5 [label="Refund Processing" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+	N6 [label="Inquiry Handling" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N7 [label="Product Information Provision" color="#CB9BE1" fillcolor="#F2E6F5" shape=inputoutput style=filled]
+	N8 [label="Customer Loyalty Program Support" color="#CB9BE1" fillcolor="#F2E6F5" shape=multipledocuments style=filled]
+	N9 [label="Feedback Loop to Product Development" color="#388E3C" fillcolor="#F1F8E9" shape=database style=filled]
+	N10 [label="Feedback Collection" color="#CB9BE1" fillcolor="#F2E6F5" shape=database style=filled]
+	N11 [label="Issue Escalation" color="#7E57C2" fillcolor="#D1C4E9" shape=rect style=filled]
+	N12 [label="FAQ Management" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N13 [label="Complaint Resolution" color="#CB9BE1" fillcolor="#F2E6F5" shape=rectangle style=filled]
+	N14 [label="Service Level Agreement Monitoring" color="#7E57C2" fillcolor="#D1C4E9" shape=vnode_shape style=filled]
+	N15 [label="Social Media Response" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N16 [label="Call Center Management" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+	N17 [label="Technical Support" color="#7E57C2" fillcolor="#D1C4E9" shape=inputoutput style=filled]
+	N18 [label="First Contact Resolution Optimization" color="#7E57C2" fillcolor="#D1C4E9" shape=vnode_shape style=filled]
+	N19 [label="Customer Journey Mapping" color="#388E3C" fillcolor="#F1F8E9" shape=database style=filled]
+	N20 [label="Proactive Communication" color="#7E57C2" fillcolor="#D1C4E9" shape=database style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Customer Retention Strategies {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Customer Retention Strategies"
+		nest0_0 [label="Up_selling Opportunities" color="#CB9BE1" fillcolor="#F2E6F5" shape=vnode_shape style=filled]
+		nest0_1 [label="Multilingual Support" color="#7E57C2" fillcolor="#D1C4E9" shape=preparation style=filled]
+	}
+	subgraph cluster_Self_Service Portal Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Self_Service Portal Management"
+		nest1_0 [label="Live Chat Support" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+		nest1_1 [label="Customer Satisfaction Survey" color="#7E57C2" fillcolor="#D1C4E9" shape=action style=filled]
+		nest1_2 [label="Customer Relationship Management System Use" color="#388E3C" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N17 -> N18 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N18 -> N19 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N19 -> N20 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N17 [color="#000000" penwidth=1.5 style=dashed label="analyzes" dir=forward]
+	nest1_0 -> nest1_1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N15 -> nest1_0 [color="#388E3C" penwidth=1.5 style=solid label="resolves" dir=forward]
+	nest1_2 -> N20 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N15 -> S0 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N19 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N17 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N20 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S0 -> N18 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N15 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N20 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N18 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N19 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M0 [color="#CB9BE1" penwidth=1.5 style=solid label="consults" dir=forward]
+	N5 -> M0 [color="#CB9BE1" penwidth=1.5 style=solid label="monitors" dir=forward]
+	M0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_105.txt b/test/diagrams/graph_hard/diagrams_105.txt
new file mode 100644
index 0000000000000000000000000000000000000000..72306477f3188695bc37c5a59379901c12ba255c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_105.txt
@@ -0,0 +1,42 @@
+<Call Center Management, connectedTo, Technical Support>
+<Complaint Resolution, connectedTo, Customer Journey Mapping>
+<Complaint Resolution, connectedTo, First Contact Resolution Optimization>
+<Complaint Resolution, connectedTo, Proactive Communication>
+<Complaint Resolution, connectedTo, Service Level Agreement Monitoring>
+<Complaint Resolution, connectedTo, Social Media Response>
+<Complaint Trend Analysis, connectedTo, Product Information Provision>
+<Complaint Trend Analysis, connectedTo, Refund Processing>
+<Customer Journey Mapping, connectedTo, Proactive Communication>
+<Customer Loyalty Program Support, connectedTo, Feedback Loop to Product Development>
+<Customer Loyalty Program Support, consults, Feedback Collection>
+<Customer Relationship Management System Use, connectedTo, Proactive Communication>
+<Customer Satisfaction Survey, connectedTo, Customer Relationship Management System Use>
+<Email Support, connectedTo, Knowledge Base Creation>
+<FAQ Management, connectedTo, Complaint Resolution>
+<Feedback Collection, connectedTo, Issue Escalation>
+<Feedback Loop to Product Development, connectedTo, Feedback Collection>
+<First Contact Resolution Optimization, connectedTo, Customer Journey Mapping>
+<Inquiry Handling, connectedTo, Product Information Provision>
+<Issue Escalation, connectedTo, FAQ Management>
+<Issue Escalation, connectedTo, Up_selling Opportunities>
+<Knowledge Base Creation, connectedTo, Feedback Collection>
+<Knowledge Base Creation, connectedTo, Order Status Check>
+<Knowledge Base Creation, connectedTo, Product Information Provision>
+<Live Chat Support, connectedTo, Customer Satisfaction Survey>
+<Multilingual Support, analyzes, Technical Support>
+<Order Status Check, connectedTo, Product Information Provision>
+<Order Status Check, connectedTo, Service Blueprinting>
+<Product Information Provision, connectedTo, Customer Loyalty Program Support>
+<Refund Processing, connectedTo, Inquiry Handling>
+<Refund Processing, monitors, Feedback Collection>
+<Service Blueprinting, connectedTo, Complaint Trend Analysis>
+<Service Blueprinting, connectedTo, Product Information Provision>
+<Service Level Agreement Monitoring, connectedTo, Social Media Response>
+<Social Media Response, connectedTo, Call Center Management>
+<Social Media Response, connectedTo, Customer Journey Mapping>
+<Social Media Response, connectedTo, First Contact Resolution Optimization>
+<Social Media Response, connectedTo, Proactive Communication>
+<Social Media Response, connectedTo, Technical Support>
+<Social Media Response, resolves, Live Chat Support>
+<Technical Support, connectedTo, First Contact Resolution Optimization>
+<Up_selling Opportunities, connectedTo, Multilingual Support>
diff --git a/test/diagrams/graph_hard/diagrams_106.dot b/test/diagrams/graph_hard/diagrams_106.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9234ccb1c332590b2583f811e302d1cc31d1405f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_106.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=LR
+	N0 [label="Sustainability Initiatives" color="#795548" fillcolor="#D7CCC8" shape=predefinedprocess style=filled]
+	N1 [label="Production Scheduling Integration" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+	N2 [label="Warehousing" color="#795548" fillcolor="#D7CCC8" shape=action style=filled]
+	N3 [label="Supplier Selection" color="#795548" fillcolor="#D7CCC8" shape=predefinedprocess style=filled]
+	N4 [label="Last_Mile Delivery Optimization" color="#00BCD4" fillcolor="#B2EBF2" shape=inputoutput style=filled]
+	N5 [label="Material Flow Management" color="#E91E63" fillcolor="#F8BBD0" shape=preparation style=filled]
+	N6 [label="Predictive Analytics" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N7 [label="Contract Manufacturing Oversight" color="#795548" fillcolor="#D7CCC8" shape=action style=filled]
+	N8 [label="Intermodal Transportation" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N9 [label="Reverse Logistics" color="#00BCD4" fillcolor="#B2EBF2" shape=predefinedprocess style=filled]
+	N10 [label="Data Analytics for Supply Chain" color="#00BCD4" fillcolor="#B2EBF2" shape=multipledocuments style=filled]
+	N11 [label="Digital Twin of Supply Chain" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N12 [label="Risk Management" color="#795548" fillcolor="#D7CCC8" shape=vnode_shape style=filled]
+	N13 [label="Resilience Planning" color="#E91E63" fillcolor="#F8BBD0" shape=document style=filled]
+	N14 [label="Production Planning" color="#795548" fillcolor="#D7CCC8" shape=rectangle style=filled]
+	N15 [label="Warehouse Automation" color="#795548" fillcolor="#D7CCC8" shape=database style=filled]
+	S0 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Order Fulfillment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Order Fulfillment"
+		nest0_0 [label="Demand Planning" color="#795548" fillcolor="#D7CCC8" shape=inputoutput style=filled]
+		nest0_1 [label="Supplier Relationship Management" color="#00BCD4" fillcolor="#B2EBF2" shape=diamond style=filled]
+		nest0_2 [label="Risk Mitigation Strategies" color="#00BCD4" fillcolor="#B2EBF2" shape=multipledocuments style=filled]
+		nest0_3 [label="Supply Chain Finance" color="#795548" fillcolor="#D7CCC8" shape=document style=filled]
+	}
+	subgraph cluster_Transportation Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Transportation Management"
+		nest1_0 [label="Supply Chain Visibility" color="#795548" fillcolor="#D7CCC8" shape=rectangle style=filled]
+		nest1_1 [label="Circular Economy Practices" color="#E91E63" fillcolor="#F8BBD0" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#795548" penwidth=1.5 style=dashed label="transparency" dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#795548" penwidth=1.5 style=dashed label="complies" dir=forward]
+	N10 -> N11 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#795548" penwidth=1.5 style=solid label="communicates" dir=forward]
+	nest0_1 -> nest0_2 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest0_0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N8 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N13 -> nest1_0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N11 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N12 -> S0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N0 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N11 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N11 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_106.txt b/test/diagrams/graph_hard/diagrams_106.txt
new file mode 100644
index 0000000000000000000000000000000000000000..caa5f75b382374c5e144090887c73783204204e7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_106.txt
@@ -0,0 +1,33 @@
+<Circular Economy Practices, connectedTo, Digital Twin of Supply Chain>
+<Contract Manufacturing Oversight, connectedTo, Digital Twin of Supply Chain>
+<Contract Manufacturing Oversight, connectedTo, Intermodal Transportation>
+<Data Analytics for Supply Chain, connectedTo, Digital Twin of Supply Chain>
+<Demand Planning, communicates, Supplier Relationship Management>
+<Digital Twin of Supply Chain, connectedTo, Risk Management>
+<Intermodal Transportation, connectedTo, Digital Twin of Supply Chain>
+<Intermodal Transportation, connectedTo, Reverse Logistics>
+<Last_Mile Delivery Optimization, transparency, Material Flow Management>
+<Material Flow Management, connectedTo, Predictive Analytics>
+<Predictive Analytics, connectedTo, Contract Manufacturing Oversight>
+<Predictive Analytics, connectedTo, Digital Twin of Supply Chain>
+<Production Planning, connectedTo, Warehouse Automation>
+<Production Scheduling Integration, connectedTo, Digital Twin of Supply Chain>
+<Production Scheduling Integration, connectedTo, Warehousing>
+<Resilience Planning, connectedTo, Demand Planning>
+<Resilience Planning, connectedTo, Production Planning>
+<Resilience Planning, connectedTo, Supply Chain Visibility>
+<Reverse Logistics, complies, Data Analytics for Supply Chain>
+<Risk Management, connectedTo, Production Planning>
+<Risk Management, connectedTo, Resilience Planning>
+<Risk Management, connectedTo, Warehouse Automation>
+<Risk Mitigation Strategies, connectedTo, Supply Chain Finance>
+<Supplier Relationship Management, connectedTo, Risk Mitigation Strategies>
+<Supplier Selection, connectedTo, Digital Twin of Supply Chain>
+<Supplier Selection, connectedTo, Last_Mile Delivery Optimization>
+<Supply Chain Finance, connectedTo, Intermodal Transportation>
+<Supply Chain Visibility, connectedTo, Circular Economy Practices>
+<Sustainability Initiatives, connectedTo, Contract Manufacturing Oversight>
+<Sustainability Initiatives, connectedTo, Digital Twin of Supply Chain>
+<Sustainability Initiatives, connectedTo, Production Scheduling Integration>
+<Sustainability Initiatives, connectedTo, Reverse Logistics>
+<Warehousing, connectedTo, Supplier Selection>
diff --git a/test/diagrams/graph_hard/diagrams_107.dot b/test/diagrams/graph_hard/diagrams_107.dot
new file mode 100644
index 0000000000000000000000000000000000000000..52837deb17e97dde5804dedb674d902d235a55e7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_107.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=RL
+	N0 [label="Last_Mile Delivery Optimization" color="#FFE470" fillcolor="#FFFAE0" shape=preparation style=filled]
+	N1 [label="Supply Chain Visibility" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N2 [label="Intermodal Transportation" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N3 [label="Resilience Planning" color="#388E3C" fillcolor="#C8E6C9" shape=diamond style=filled]
+	N4 [label="Supply Chain Finance" color="#673AB7" fillcolor="#D1C4E9" shape=rectangle style=filled]
+	N5 [label="Customs Compliance" color="#673AB7" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N6 [label="Distribution Network Design" color="#673AB7" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N7 [label="Production Planning" color="#388E3C" fillcolor="#C8E6C9" shape=preparation style=filled]
+	N8 [label="Procurement" color="#FFE470" fillcolor="#FFFAE0" shape=action style=filled]
+	N9 [label="Risk Mitigation Strategies" color="#FFE470" fillcolor="#FFFAE0" shape=inputoutput style=filled]
+	N10 [label="Third_Party Logistics Management" color="#388E3C" fillcolor="#C8E6C9" shape=inputoutput style=filled]
+	N11 [label="Reverse Logistics" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N12 [label="Order Fulfillment" color="#388E3C" fillcolor="#C8E6C9" shape=inputoutput style=filled]
+	N13 [label="Vendor Managed Inventory" color="#673AB7" fillcolor="#D1C4E9" shape=action style=filled]
+	N14 [label="Risk Management" color="#673AB7" fillcolor="#D1C4E9" shape=action style=filled]
+	N15 [label="Digital Twin of Supply Chain" color="#FFE470" fillcolor="#FFFAE0" shape=rect style=filled]
+	N16 [label="Quality Control in Supply Chain" color="#673AB7" fillcolor="#D1C4E9" shape=predefinedprocess style=filled]
+	N17 [label="Circular Economy Practices" color="#FFE470" fillcolor="#FFFAE0" shape=inputoutput style=filled]
+	N18 [label="Global Sourcing Strategy" color="#388E3C" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	S0 [label="" color="#673AB7" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFE470" fillcolor="#FFFAE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFE470" fillcolor="#FFFAE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Production Scheduling Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Production Scheduling Integration"
+		nest0_0 [label="Hazardous Materials Handling" color="#388E3C" fillcolor="#C8E6C9" shape=database style=filled]
+		nest0_1 [label="Performance Monitoring" color="#673AB7" fillcolor="#D1C4E9" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Sustainability Initiatives {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Sustainability Initiatives"
+		nest1_0 [label="Warehousing" color="#388E3C" fillcolor="#C8E6C9" shape=database style=filled]
+		nest1_1 [label="Inventory Management" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid label="analyzes" dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#388E3C" penwidth=1.5 style=solid label="integrates" dir=forward]
+	N14 -> N15 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N17 -> N18 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N2 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed label="mitigates" dir=forward]
+	N6 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N5 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N2 -> S0 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#FFE470" penwidth=1.5 style=dashed label="tracks" dir=forward]
+	S0 -> N17 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N18 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#FFE470" penwidth=1.5 style=dashed label="returns" dir=forward]
+	M1 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> N2 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_107.txt b/test/diagrams/graph_hard/diagrams_107.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8c3e288ca073b2187897fdb2febed22f9065196c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_107.txt
@@ -0,0 +1,32 @@
+<Circular Economy Practices, connectedTo, Global Sourcing Strategy>
+<Customs Compliance, connectedTo, Distribution Network Design>
+<Digital Twin of Supply Chain, connectedTo, Quality Control in Supply Chain>
+<Distribution Network Design, analyzes, Production Planning>
+<Distribution Network Design, connectedTo, Hazardous Materials Handling>
+<Distribution Network Design, connectedTo, Warehousing>
+<Hazardous Materials Handling, connectedTo, Performance Monitoring>
+<Intermodal Transportation, connectedTo, Circular Economy Practices>
+<Intermodal Transportation, connectedTo, Global Sourcing Strategy>
+<Intermodal Transportation, connectedTo, Resilience Planning>
+<Intermodal Transportation, connectedTo, Supply Chain Finance>
+<Intermodal Transportation, returns, Distribution Network Design>
+<Intermodal Transportation, tracks, Distribution Network Design>
+<Inventory Management, connectedTo, Customs Compliance>
+<Last_Mile Delivery Optimization, connectedTo, Supply Chain Finance>
+<Last_Mile Delivery Optimization, connectedTo, Supply Chain Visibility>
+<Order Fulfillment, connectedTo, Vendor Managed Inventory>
+<Performance Monitoring, connectedTo, Intermodal Transportation>
+<Procurement, connectedTo, Risk Mitigation Strategies>
+<Production Planning, connectedTo, Procurement>
+<Quality Control in Supply Chain, connectedTo, Circular Economy Practices>
+<Resilience Planning, connectedTo, Distribution Network Design>
+<Resilience Planning, connectedTo, Supply Chain Finance>
+<Reverse Logistics, connectedTo, Order Fulfillment>
+<Risk Management, connectedTo, Digital Twin of Supply Chain>
+<Risk Mitigation Strategies, connectedTo, Third_Party Logistics Management>
+<Supply Chain Finance, connectedTo, Customs Compliance>
+<Supply Chain Visibility, connectedTo, Intermodal Transportation>
+<Third_Party Logistics Management, connectedTo, Reverse Logistics>
+<Vendor Managed Inventory, integrates, Risk Management>
+<Warehousing, connectedTo, Intermodal Transportation>
+<Warehousing, mitigates, Inventory Management>
diff --git a/test/diagrams/graph_hard/diagrams_108.dot b/test/diagrams/graph_hard/diagrams_108.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6e1d99309269bace9cac0ffa09f073d68b3ceb63
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_108.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=TB
+	N0 [label="Resilience Planning" color="#607D8B" fillcolor="#CFD8DC" shape=database style=filled]
+	N1 [label="Transportation Management" color="#607D8B" fillcolor="#CFD8DC" shape=predefinedprocess style=filled]
+	N2 [label="Data Analytics for Supply Chain" color="#CFCFCF" fillcolor="#F6F6F6" shape=multipledocuments style=filled]
+	N3 [label="Collaborative Planning" color="#607D8B" fillcolor="#CFD8DC" shape=rect style=filled]
+	N4 [label="Circular Economy Practices" color="#A2D0FF" fillcolor="#E8F0FF" shape=multipledocuments style=filled]
+	N5 [label="Distribution Network Design" color="#607D8B" fillcolor="#CFD8DC" shape=diamond style=filled]
+	N6 [label="Contract Manufacturing Oversight" color="#CFCFCF" fillcolor="#F6F6F6" shape=rectangle style=filled]
+	N7 [label="Warehouse Automation" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	S0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#607D8B" fillcolor="#CFD8DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#A2D0FF" fillcolor="#E8F0FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Last_Mile Delivery Optimization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Last_Mile Delivery Optimization"
+		nest0_0 [label="Risk Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=inputoutput style=filled]
+		nest0_1 [label="Digital Twin of Supply Chain" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+		nest0_2 [label="Blockchain for Traceability" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+		nest0_3 [label="Third_Party Logistics Management" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	}
+	subgraph cluster_Risk Mitigation Strategies {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Risk Mitigation Strategies"
+		nest1_0 [label="Sustainability Initiatives" color="#A2D0FF" fillcolor="#E8F0FF" shape=multipledocuments style=filled]
+		nest1_1 [label="Supply Chain Finance" color="#607D8B" fillcolor="#CFD8DC" shape=multipledocuments style=filled]
+		nest1_2 [label="Order Fulfillment" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+		nest1_3 [label="Production Planning" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest0_0 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N4 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest1_0 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N7 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#A2D0FF" penwidth=1.5 style=solid label="develops" dir=forward]
+	S0 -> N6 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N3 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S2 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#CFCFCF" penwidth=1.5 style=dashed label="implements" dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N6 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_108.txt b/test/diagrams/graph_hard/diagrams_108.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7acedb1268cc12b69037093d37bf68ce47d692d5
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_108.txt
@@ -0,0 +1,30 @@
+<Blockchain for Traceability, connectedTo, Third_Party Logistics Management>
+<Circular Economy Practices, connectedTo, Distribution Network Design>
+<Circular Economy Practices, connectedTo, Risk Management>
+<Circular Economy Practices, implements, Contract Manufacturing Oversight>
+<Collaborative Planning, connectedTo, Circular Economy Practices>
+<Collaborative Planning, connectedTo, Contract Manufacturing Oversight>
+<Collaborative Planning, connectedTo, Distribution Network Design>
+<Collaborative Planning, connectedTo, Sustainability Initiatives>
+<Collaborative Planning, connectedTo, Warehouse Automation>
+<Contract Manufacturing Oversight, connectedTo, Warehouse Automation>
+<Data Analytics for Supply Chain, connectedTo, Circular Economy Practices>
+<Data Analytics for Supply Chain, connectedTo, Collaborative Planning>
+<Data Analytics for Supply Chain, connectedTo, Contract Manufacturing Oversight>
+<Data Analytics for Supply Chain, connectedTo, Warehouse Automation>
+<Digital Twin of Supply Chain, connectedTo, Blockchain for Traceability>
+<Distribution Network Design, connectedTo, Contract Manufacturing Oversight>
+<Order Fulfillment, connectedTo, Production Planning>
+<Production Planning, connectedTo, Warehouse Automation>
+<Resilience Planning, connectedTo, Circular Economy Practices>
+<Resilience Planning, connectedTo, Contract Manufacturing Oversight>
+<Resilience Planning, connectedTo, Transportation Management>
+<Risk Management, connectedTo, Digital Twin of Supply Chain>
+<Supply Chain Finance, connectedTo, Order Fulfillment>
+<Sustainability Initiatives, connectedTo, Supply Chain Finance>
+<Third_Party Logistics Management, connectedTo, Circular Economy Practices>
+<Transportation Management, connectedTo, Circular Economy Practices>
+<Transportation Management, connectedTo, Collaborative Planning>
+<Transportation Management, connectedTo, Contract Manufacturing Oversight>
+<Transportation Management, connectedTo, Data Analytics for Supply Chain>
+<Transportation Management, develops, Warehouse Automation>
diff --git a/test/diagrams/graph_hard/diagrams_109.txt b/test/diagrams/graph_hard/diagrams_109.txt
new file mode 100644
index 0000000000000000000000000000000000000000..09dd7794bd48299a1ac3949bd54e44d72c8a18bb
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_109.txt
@@ -0,0 +1,35 @@
+<Community Relations, connectedTo, Exploration Drilling>
+<Community Relations, connectedTo, Noise Management>
+<Community Relations, connectedTo, Ventilation System>
+<Environmental Impact Assessment, connectedTo, Community Relations>
+<Environmental Impact Assessment, connectedTo, Exploration>
+<Environmental Impact Assessment, connectedTo, Mine Closure Planning>
+<Environmental Impact Assessment, develops, Resource Estimation>
+<Environmental Impact Assessment, drills, Ore Extraction>
+<Exploration, complies, Open Pit Mining Operations>
+<Exploration, connectedTo, Mine Closure Planning>
+<Exploration, connectedTo, Ventilation System>
+<Exploration, maintains, Geotechnical Stability Analysis>
+<Exploration Drilling, connectedTo, Permit Acquisition>
+<Feasibility Study, connectedTo, Geotechnical Stability Analysis>
+<Feasibility Study, connectedTo, Resource Estimation>
+<Geotechnical Stability Analysis, connectedTo, Open Pit Mining Operations>
+<Mine Closure Planning, connectedTo, Feasibility Study>
+<Mine Planning, connectedTo, Environmental Impact Assessment>
+<Mine Planning, connectedTo, Open Pit Mining Operations>
+<Mineral Processing, connectedTo, Ore Extraction>
+<Mineral Processing, extracts, Geotechnical Stability Analysis>
+<Mineral Processing, plans, Open Pit Mining Operations>
+<Noise Management, separates, Ore Sorting>
+<Ore Extraction, connectedTo, Geotechnical Stability Analysis>
+<Ore Extraction, connectedTo, Open Pit Mining Operations>
+<Ore Sorting, connectedTo, Geotechnical Stability Analysis>
+<Permit Acquisition, connectedTo, Resource Estimation>
+<Reclamation, connectedTo, Geotechnical Stability Analysis>
+<Reclamation, connectedTo, Mine Planning>
+<Regulatory Compliance Reporting, connectedTo, Mineral Processing>
+<Regulatory Compliance Reporting, connectedTo, Open Pit Mining Operations>
+<Resource Estimation, connectedTo, Community Relations>
+<Safety Management, connectedTo, Regulatory Compliance Reporting>
+<Tailings Management, connectedTo, Safety Management>
+<Ventilation System, connectedTo, Tailings Management>
diff --git a/test/diagrams/graph_hard/diagrams_11.txt b/test/diagrams/graph_hard/diagrams_11.txt
new file mode 100644
index 0000000000000000000000000000000000000000..40baebc94126603aef20de7c0b8546b7ddcd767a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_11.txt
@@ -0,0 +1,28 @@
+<Advisory Committee Meeting, connectedTo, School Accreditation>
+<Advisory Committee Meeting, reports, Library Registration>
+<Alumni Network Management, connectedTo, Digital Resource Management>
+<Attendance Tracking, connectedTo, Career Services>
+<Attendance Tracking, connectedTo, Digital Resource Management>
+<Attendance Tracking, connectedTo, Internship Coordination>
+<Career Services, connectedTo, Certificate Issuance>
+<Certificate Issuance, schedules, Advisory Committee Meeting>
+<Course Selection, connectedTo, Internship Coordination>
+<Curriculum Development, connectedTo, Thesis Submission>
+<Digital Resource Management, connectedTo, Parent_Teacher Conference>
+<Extracurricular Activity, connectedTo, Alumni Network Management>
+<Internship Coordination, connectedTo, Scholarship Evaluation>
+<Internship Coordination, connectedTo, Study Abroad Program>
+<Library Registration, connectedTo, Course Selection>
+<Orientation, connectedTo, Timetable Scheduling>
+<Parent_Teacher Conference, connectedTo, Career Services>
+<Parent_Teacher Conference, connectedTo, School Accreditation>
+<Scholarship Evaluation, connectedTo, Orientation>
+<School Accreditation, connectedTo, Curriculum Development>
+<Study Abroad Program, conducts, Extracurricular Activity>
+<Thesis Submission, connectedTo, Internship Coordination>
+<Thesis Submission, connectedTo, Orientation>
+<Thesis Submission, connectedTo, Scholarship Evaluation>
+<Thesis Submission, connectedTo, Special Education Support>
+<Thesis Submission, connectedTo, Timetable Scheduling>
+<Thesis Submission, enrolls, Special Education Support>
+<Timetable Scheduling, connectedTo, Special Education Support>
diff --git a/test/diagrams/graph_hard/diagrams_110.dot b/test/diagrams/graph_hard/diagrams_110.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4295be73e60cb2244f3cea5e17d9cd24900553ad
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_110.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=BT
+	N0 [label="Exploration Drilling" color="#6EB76D" fillcolor="#E9F7E8" shape=inputoutput style=filled]
+	N1 [label="Ventilation System" color="#90A4AE" fillcolor="#ECEFF1" shape=document style=filled]
+	N2 [label="Ore Extraction" color="#6EB76D" fillcolor="#E9F7E8" shape=document style=filled]
+	N3 [label="Geological Survey" color="#6EB76D" fillcolor="#E9F7E8" shape=multipledocuments style=filled]
+	N4 [label="Asset Management" color="#6EB76D" fillcolor="#E9F7E8" shape=rect style=filled]
+	N5 [label="Noise Management" color="#90A4AE" fillcolor="#ECEFF1" shape=document style=filled]
+	N6 [label="Crushing and Grinding" color="#D3EB9F" fillcolor="#F8FDD3" shape=diamond style=filled]
+	N7 [label="Feasibility Study" color="#D3EB9F" fillcolor="#F8FDD3" shape=action style=filled]
+	N8 [label="Waste Rock Management" color="#6EB76D" fillcolor="#E9F7E8" shape=database style=filled]
+	N9 [label="Reclamation" color="#90A4AE" fillcolor="#ECEFF1" shape=preparation style=filled]
+	N10 [label="Equipment Maintenance" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N11 [label="Resource Estimation" color="#D3EB9F" fillcolor="#F8FDD3" shape=rectangle style=filled]
+	N12 [label="Open Pit Mining Operations" color="#6EB76D" fillcolor="#E9F7E8" shape=diamond style=filled]
+	N13 [label="Underground Mining Operations" color="#90A4AE" fillcolor="#ECEFF1" shape=database style=filled]
+	N14 [label="Refining" color="#90A4AE" fillcolor="#ECEFF1" shape=vnode_shape style=filled]
+	N15 [label="Remote Operations Center" color="#90A4AE" fillcolor="#ECEFF1" shape=action style=filled]
+	S0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Regulatory Compliance Reporting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Regulatory Compliance Reporting"
+		nest0_0 [label="Exploration" color="#6EB76D" fillcolor="#E9F7E8" shape=preparation style=filled]
+		nest0_1 [label="Environmental Impact Assessment" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+		nest0_2 [label="Drilling and Blasting" color="#90A4AE" fillcolor="#ECEFF1" shape=predefinedprocess style=filled]
+		nest0_3 [label="Mine Closure Planning" color="#6EB76D" fillcolor="#E9F7E8" shape=document style=filled]
+	}
+	subgraph cluster_Water Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Water Management"
+		nest1_0 [label="Haulage" color="#D3EB9F" fillcolor="#F8FDD3" shape=vnode_shape style=filled]
+		nest1_1 [label="Robotics in Mining" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed label="safety" dir=forward]
+	N1 -> N2 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#D3EB9F" penwidth=1.5 style=solid label="separates" dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest0_0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N8 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest1_0 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	S1 -> N15 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N3 -> S2 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M1 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N7 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N14 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	M2 -> N6 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_112.dot b/test/diagrams/graph_hard/diagrams_112.dot
new file mode 100644
index 0000000000000000000000000000000000000000..da20ad6d97559e07cbf444a35c62bf4efaae2c56
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_112.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=TB
+	N0 [label="Ballast Water Management" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N1 [label="Search and Rescue Coordination" color="#90A4AE" fillcolor="#ECEFF1" shape=predefinedprocess style=filled]
+	N2 [label="Fisheries Management" color="#6EB76D" fillcolor="#E9F7E8" shape=vnode_shape style=filled]
+	N3 [label="Autonomous Vessels" color="#90A4AE" fillcolor="#ECEFF1" shape=vnode_shape style=filled]
+	N4 [label="Pilotage" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N5 [label="Maritime Security" color="#AABEC6" fillcolor="#E0E6E9" shape=inputoutput style=filled]
+	N6 [label="Subsea Cable Laying" color="#AABEC6" fillcolor="#E0E6E9" shape=diamond style=filled]
+	N7 [label="Maritime Law Compliance" color="#AABEC6" fillcolor="#E0E6E9" shape=rect style=filled]
+	N8 [label="Route Planning" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N9 [label="Marine Insurance" color="#6EB76D" fillcolor="#E9F7E8" shape=hexagon style=filled]
+	S0 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Ship Registry {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Ship Registry"
+		nest0_0 [label="Dry Docking" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+		nest0_1 [label="Port Congestion Management" color="#6EB76D" fillcolor="#E9F7E8" shape=inputoutput style=filled]
+		nest0_2 [label="Digitalization of Shipping" color="#AABEC6" fillcolor="#E0E6E9" shape=diamond style=filled]
+		nest0_3 [label="Bunkering" color="#6EB76D" fillcolor="#E9F7E8" shape=action style=filled]
+	}
+	subgraph cluster_Vessel Maintenance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Vessel Maintenance"
+		nest1_0 [label="Salvage Operations" color="#AABEC6" fillcolor="#E0E6E9" shape=hexagon style=filled]
+		nest1_1 [label="Ship_to_Shore Communication" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+		nest1_2 [label="Marine Safety Inspection" color="#AABEC6" fillcolor="#E0E6E9" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#AABEC6" penwidth=1.5 style=dashed label="systems" dir=forward]
+	N1 -> N2 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#90A4AE" penwidth=1.5 style=solid label="operates" dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N7 [color="#000000" penwidth=1.5 style=solid label="transports" dir=forward]
+	nest1_0 -> nest1_1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N2 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	S1 -> N3 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N2 -> S2 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	M0 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N9 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_112.txt b/test/diagrams/graph_hard/diagrams_112.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cbf061469609d909b320ceb0695a5c30e1cefc8a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_112.txt
@@ -0,0 +1,28 @@
+<Autonomous Vessels, connectedTo, Maritime Security>
+<Autonomous Vessels, connectedTo, Subsea Cable Laying>
+<Autonomous Vessels, operates, Pilotage>
+<Ballast Water Management, connectedTo, Autonomous Vessels>
+<Ballast Water Management, systems, Search and Rescue Coordination>
+<Bunkering, transports, Maritime Law Compliance>
+<Digitalization of Shipping, connectedTo, Bunkering>
+<Dry Docking, connectedTo, Port Congestion Management>
+<Fisheries Management, connectedTo, Autonomous Vessels>
+<Fisheries Management, connectedTo, Dry Docking>
+<Fisheries Management, connectedTo, Marine Insurance>
+<Fisheries Management, connectedTo, Route Planning>
+<Marine Safety Inspection, connectedTo, Fisheries Management>
+<Maritime Law Compliance, connectedTo, Marine Insurance>
+<Maritime Law Compliance, connectedTo, Route Planning>
+<Maritime Security, connectedTo, Subsea Cable Laying>
+<Pilotage, connectedTo, Marine Insurance>
+<Pilotage, connectedTo, Maritime Security>
+<Port Congestion Management, connectedTo, Digitalization of Shipping>
+<Route Planning, connectedTo, Marine Insurance>
+<Salvage Operations, connectedTo, Ship_to_Shore Communication>
+<Search and Rescue Coordination, connectedTo, Autonomous Vessels>
+<Search and Rescue Coordination, connectedTo, Fisheries Management>
+<Search and Rescue Coordination, connectedTo, Marine Insurance>
+<Search and Rescue Coordination, connectedTo, Pilotage>
+<Search and Rescue Coordination, connectedTo, Salvage Operations>
+<Ship_to_Shore Communication, connectedTo, Marine Safety Inspection>
+<Subsea Cable Laying, connectedTo, Maritime Law Compliance>
diff --git a/test/diagrams/graph_hard/diagrams_113.dot b/test/diagrams/graph_hard/diagrams_113.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2760ebda98955bffe9f6d839ea94b05e6a43818c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_113.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=TB
+	N0 [label="Cargo Loading" color="#FFF9AE" fillcolor="#FFFCE6" shape=document style=filled]
+	N1 [label="Ship Registry" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N2 [label="Inland Waterway Transport" color="#FFF176" fillcolor="#FFFDE7" shape=database style=filled]
+	N3 [label="Bunkering" color="#FFF9AE" fillcolor="#FFFCE6" shape=action style=filled]
+	N4 [label="Freight Forwarding" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N5 [label="Customs Clearance" color="#7E57C2" fillcolor="#D1C4E9" shape=action style=filled]
+	N6 [label="Subsea Cable Laying" color="#FFF176" fillcolor="#FFFDE7" shape=preparation style=filled]
+	N7 [label="Search and Rescue Coordination" color="#7E57C2" fillcolor="#D1C4E9" shape=vnode_shape style=filled]
+	N8 [label="Fuel Consumption Optimization" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N9 [label="Pollution Control" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N10 [label="Port Operations" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N11 [label="Hydrographic Surveying" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N12 [label="Dry Docking" color="#7E57C2" fillcolor="#D1C4E9" shape=document style=filled]
+	N13 [label="Crew Management" color="#FFF176" fillcolor="#FFFDE7" shape=database style=filled]
+	M0 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFF176" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Marine Research {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Marine Research"
+		nest0_0 [label="Green Shipping Initiatives" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+		nest0_1 [label="Marine Data Analytics" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest0_2 [label="Route Planning" color="#FFF9AE" fillcolor="#FFFCE6" shape=inputoutput style=filled]
+		nest0_3 [label="Navigation" color="#FFF176" fillcolor="#FFFDE7" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Maritime Law Compliance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Maritime Law Compliance"
+		nest1_0 [label="Salvage Operations" color="#FFF176" fillcolor="#FFFDE7" shape=database style=filled]
+		nest1_1 [label="Vessel Maintenance" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	}
+	N0 -> N1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#FFF176" penwidth=1.5 style=solid label="responds" dir=forward]
+	N11 -> nest0_0 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N1 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N8 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N7 -> M0 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N11 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_113.txt b/test/diagrams/graph_hard/diagrams_113.txt
new file mode 100644
index 0000000000000000000000000000000000000000..eced2ea949410063a8e8a7596dc5e3f0260e00ac
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_113.txt
@@ -0,0 +1,27 @@
+<Bunkering, connectedTo, Freight Forwarding>
+<Bunkering, connectedTo, Pollution Control>
+<Cargo Loading, connectedTo, Ship Registry>
+<Customs Clearance, connectedTo, Subsea Cable Laying>
+<Dry Docking, connectedTo, Crew Management>
+<Freight Forwarding, connectedTo, Customs Clearance>
+<Freight Forwarding, connectedTo, Hydrographic Surveying>
+<Freight Forwarding, connectedTo, Pollution Control>
+<Fuel Consumption Optimization, connectedTo, Pollution Control>
+<Green Shipping Initiatives, connectedTo, Marine Data Analytics>
+<Hydrographic Surveying, connectedTo, Dry Docking>
+<Hydrographic Surveying, connectedTo, Green Shipping Initiatives>
+<Inland Waterway Transport, connectedTo, Bunkering>
+<Inland Waterway Transport, connectedTo, Hydrographic Surveying>
+<Marine Data Analytics, connectedTo, Route Planning>
+<Navigation, connectedTo, Ship Registry>
+<Pollution Control, connectedTo, Port Operations>
+<Port Operations, connectedTo, Hydrographic Surveying>
+<Route Planning, responds, Navigation>
+<Salvage Operations, connectedTo, Vessel Maintenance>
+<Search and Rescue Coordination, connectedTo, Fuel Consumption Optimization>
+<Search and Rescue Coordination, connectedTo, Hydrographic Surveying>
+<Ship Registry, connectedTo, Inland Waterway Transport>
+<Subsea Cable Laying, connectedTo, Pollution Control>
+<Subsea Cable Laying, connectedTo, Salvage Operations>
+<Subsea Cable Laying, connectedTo, Search and Rescue Coordination>
+<Vessel Maintenance, connectedTo, Fuel Consumption Optimization>
diff --git a/test/diagrams/graph_hard/diagrams_114.txt b/test/diagrams/graph_hard/diagrams_114.txt
new file mode 100644
index 0000000000000000000000000000000000000000..05a41ead528d5890075ccaa008e007d62cc22238
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_114.txt
@@ -0,0 +1,31 @@
+<Bunkering, connectedTo, Ship_to_Shore Communication>
+<Cargo Loading, connectedTo, Fuel Consumption Optimization>
+<Cargo Loading, connectedTo, Inland Waterway Transport>
+<Container Tracking, connectedTo, Fleet Management>
+<Crew Management, connectedTo, Marine Safety Inspection>
+<Fisheries Management, connectedTo, Fuel Consumption Optimization>
+<Fisheries Management, connectedTo, Marine Safety Inspection>
+<Fisheries Management, connectedTo, Voyage Optimization>
+<Fisheries Management, secures, Inland Waterway Transport>
+<Fleet Management, connectedTo, Crew Management>
+<Fuel Consumption Optimization, connectedTo, Terminal Management>
+<Hydrographic Surveying, connectedTo, Container Tracking>
+<Inland Waterway Transport, connectedTo, Terminal Management>
+<Inland Waterway Transport, connectedTo, Voyage Optimization>
+<Marine Safety Inspection, connectedTo, Cargo Loading>
+<Marine Safety Inspection, connectedTo, Fuel Consumption Optimization>
+<Marine Safety Inspection, connectedTo, Terminal Management>
+<Maritime Law Compliance, connectedTo, Hydrographic Surveying>
+<Maritime Law Compliance, connectedTo, Subsea Cable Laying>
+<Maritime Security, connectedTo, Bunkering>
+<Maritime Security, connectedTo, Fisheries Management>
+<Maritime Security, connectedTo, Fuel Consumption Optimization>
+<Maritime Security, connectedTo, Marine Safety Inspection>
+<Ship Design, connectedTo, Cargo Loading>
+<Ship_to_Shore Communication, salvages, Ship Design>
+<Subsea Cable Laying, connectedTo, Search and Rescue Coordination>
+<Terminal Management, connectedTo, Maritime Law Compliance>
+<Vessel Maintenance, connectedTo, Marine Safety Inspection>
+<Vessel Maintenance, connectedTo, Maritime Security>
+<Voyage Optimization, connectedTo, Fuel Consumption Optimization>
+<Voyage Optimization, connectedTo, Terminal Management>
diff --git a/test/diagrams/graph_hard/diagrams_115.txt b/test/diagrams/graph_hard/diagrams_115.txt
new file mode 100644
index 0000000000000000000000000000000000000000..202ad585c4e694f10bd5c28a5e1c091e94da62f0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_115.txt
@@ -0,0 +1,24 @@
+<Data Acquisition, calibrates, Extravehicular Activity Planning>
+<Data Acquisition, connectedTo, In_Situ Resource Utilization>
+<Data Acquisition, connectedTo, Mission Design>
+<Exoplanet Discovery, connectedTo, Propellant Management>
+<Exoplanet Discovery, connectedTo, Space Weather Forecasting>
+<Exoplanet Discovery, connectedTo, Spacecraft Control>
+<Extravehicular Activity Planning, connectedTo, In_Situ Resource Utilization>
+<International Collaboration, connectedTo, Radiation Shielding Design>
+<Interplanetary Trajectory Calculation, connectedTo, Exoplanet Discovery>
+<Life Support Systems, connectedTo, Satellite Deployment>
+<Lunar Exploration, connectedTo, Spacecraft Control>
+<Mission Design, connectedTo, Interplanetary Trajectory Calculation>
+<Mission Design, protects, Extravehicular Activity Planning>
+<Propellant Management, connectedTo, International Collaboration>
+<Propellant Management, connectedTo, Space Weather Forecasting>
+<Radiation Shielding Design, connectedTo, Mission Design>
+<Radiation Shielding Design, inspires, Interplanetary Trajectory Calculation>
+<Sample Return Missions, connectedTo, Propellant Management>
+<Satellite Deployment, connectedTo, Data Acquisition>
+<Space Weather Forecasting, connectedTo, Extravehicular Activity Planning>
+<Space Weather Forecasting, connectedTo, Lunar Exploration>
+<Space Weather Forecasting, connectedTo, Satellite Deployment>
+<Space Weather Forecasting, navigates, Mission Design>
+<Spacecraft Control, connectedTo, Life Support Systems>
diff --git a/test/diagrams/graph_hard/diagrams_116.dot b/test/diagrams/graph_hard/diagrams_116.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a0498e809ebc309997cbcb58084ba3b477e025d4
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_116.dot
@@ -0,0 +1,85 @@
+digraph {
+	rankdir=BT
+	N0 [label="Ground Station Operations" color="#66BB6A" fillcolor="#E8F5E9" shape=preparation style=filled]
+	N1 [label="Data Acquisition" color="#66BB6A" fillcolor="#E8F5E9" shape=action style=filled]
+	N2 [label="Mission Control Center Management" color="#AF56A6" fillcolor="#DDCEDD" shape=document style=filled]
+	N3 [label="Microgravity Experiments" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N4 [label="Scientific Data Analysis" color="#66BB6A" fillcolor="#E8F5E9" shape=vnode_shape style=filled]
+	N5 [label="Sample Return Missions" color="#66BB6A" fillcolor="#E8F5E9" shape=diamond style=filled]
+	N6 [label="Space Station Operations" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+	N7 [label="Launch Operations" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N8 [label="Astrophysics Research" color="#AF56A6" fillcolor="#DDCEDD" shape=inputoutput style=filled]
+	N9 [label="Autonomous Rendezvous and Docking" color="#AF56A6" fillcolor="#DDCEDD" shape=predefinedprocess style=filled]
+	N10 [label="Rocket Propulsion Development" color="#66BB6A" fillcolor="#E8F5E9" shape=inputoutput style=filled]
+	N11 [label="Space Habitat Development" color="#66BB6A" fillcolor="#E8F5E9" shape=document style=filled]
+	N12 [label="Mars Mission Planning" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N13 [label="Payload Development" color="#66BB6A" fillcolor="#E8F5E9" shape=document style=filled]
+	N14 [label="International Collaboration" color="#FFB2A5" fillcolor="#FFDCD6" shape=document style=filled]
+	N15 [label="In_Situ Resource Utilization" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N16 [label="Mission Design" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N17 [label="Planetary Science Research" color="#AF56A6" fillcolor="#DDCEDD" shape=diamond style=filled]
+	S0 [label="" color="#FFB2A5" fillcolor="#FFDCD6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFB2A5" fillcolor="#FFDCD6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Satellite Deployment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Satellite Deployment"
+		nest0_0 [label="Deep Space Communications" color="#FFB2A5" fillcolor="#FFDCD6" shape=rectangle style=filled]
+		nest0_1 [label="Radiation Shielding Design" color="#FFB2A5" fillcolor="#FFDCD6" shape=action style=filled]
+	}
+	subgraph cluster_New Space Technology Development {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="New Space Technology Development"
+		nest1_0 [label="Exoplanet Discovery" color="#FFB2A5" fillcolor="#FFDCD6" shape=database style=filled]
+		nest1_1 [label="Lunar Exploration" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest1_2 [label="Interplanetary Trajectory Calculation" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+		nest1_3 [label="Launch Vehicle Integration" color="#FFB2A5" fillcolor="#FFDCD6" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#66BB6A" penwidth=1.5 style=dashed label="warns" dir=forward]
+	N9 -> N10 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#FFB2A5" penwidth=1.5 style=solid label="calibrates" dir=forward]
+	N13 -> N14 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N11 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N9 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#AF56A6" penwidth=1.5 style=dashed label="protects" dir=forward]
+	N13 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N14 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N13 -> S0 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	S0 -> N16 [color="#AF56A6" penwidth=1.5 style=dashed label="simulates" dir=forward]
+	S0 -> N15 [color="#66BB6A" penwidth=1.5 style=solid label="analyzes" dir=forward]
+	N14 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N17 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S2 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	S2 -> N13 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	S2 -> N17 [color="#000000" penwidth=1.5 style=solid label="collects" dir=forward]
+	S2 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> M0 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N15 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N17 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N14 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	M1 -> N17 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_116.txt b/test/diagrams/graph_hard/diagrams_116.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9dc0e97d347dc99ab318c483ef9ca8de1e0f258f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_116.txt
@@ -0,0 +1,37 @@
+<Astrophysics Research, warns, Autonomous Rendezvous and Docking>
+<Autonomous Rendezvous and Docking, connectedTo, Rocket Propulsion Development>
+<Data Acquisition, connectedTo, Mission Control Center Management>
+<Deep Space Communications, connectedTo, Radiation Shielding Design>
+<Exoplanet Discovery, connectedTo, Lunar Exploration>
+<Ground Station Operations, connectedTo, Data Acquisition>
+<In_Situ Resource Utilization, connectedTo, Mission Design>
+<In_Situ Resource Utilization, connectedTo, Planetary Science Research>
+<International Collaboration, connectedTo, In_Situ Resource Utilization>
+<International Collaboration, connectedTo, Mission Design>
+<International Collaboration, connectedTo, Planetary Science Research>
+<Interplanetary Trajectory Calculation, protects, Launch Vehicle Integration>
+<Launch Operations, connectedTo, Astrophysics Research>
+<Launch Vehicle Integration, connectedTo, International Collaboration>
+<Lunar Exploration, connectedTo, Interplanetary Trajectory Calculation>
+<Mars Mission Planning, calibrates, Payload Development>
+<Microgravity Experiments, connectedTo, Scientific Data Analysis>
+<Mission Control Center Management, connectedTo, Microgravity Experiments>
+<Mission Control Center Management, connectedTo, Planetary Science Research>
+<Mission Design, connectedTo, Planetary Science Research>
+<Payload Development, analyzes, In_Situ Resource Utilization>
+<Payload Development, connectedTo, Exoplanet Discovery>
+<Payload Development, connectedTo, International Collaboration>
+<Payload Development, simulates, Mission Design>
+<Radiation Shielding Design, connectedTo, Autonomous Rendezvous and Docking>
+<Rocket Propulsion Development, connectedTo, Space Habitat Development>
+<Sample Return Missions, collects, Planetary Science Research>
+<Sample Return Missions, connectedTo, Payload Development>
+<Sample Return Missions, connectedTo, Rocket Propulsion Development>
+<Sample Return Missions, connectedTo, Space Station Operations>
+<Scientific Data Analysis, connectedTo, Planetary Science Research>
+<Scientific Data Analysis, connectedTo, Sample Return Missions>
+<Space Habitat Development, connectedTo, Deep Space Communications>
+<Space Habitat Development, connectedTo, Mars Mission Planning>
+<Space Habitat Development, connectedTo, Planetary Science Research>
+<Space Station Operations, connectedTo, Launch Operations>
+<Space Station Operations, connectedTo, Planetary Science Research>
diff --git a/test/diagrams/graph_hard/diagrams_117.dot b/test/diagrams/graph_hard/diagrams_117.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ffc8ca9460f4b991bc5c70e7b092760562a46981
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_117.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=BT
+	N0 [label="Astrophysics Research" color="#FF8A65" fillcolor="#FBE9E7" shape=preparation style=filled]
+	N1 [label="Extravehicular Activity Planning" color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+	N2 [label="Scientific Data Analysis" color="#FF8A65" fillcolor="#FBE9E7" shape=action style=filled]
+	N3 [label="Space Station Operations" color="#92C79A" fillcolor="#E8F0EA" shape=multipledocuments style=filled]
+	N4 [label="Data Acquisition" color="#E91E63" fillcolor="#F8BBD0" shape=rectangle style=filled]
+	N5 [label="Rocket Propulsion Development" color="#FF8A65" fillcolor="#FBE9E7" shape=preparation style=filled]
+	N6 [label="Exoplanet Discovery" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N7 [label="Deep Space Communications" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N8 [label="Space Habitat Development" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N9 [label="International Collaboration" color="#E91E63" fillcolor="#F8BBD0" shape=rectangle style=filled]
+	N10 [label="Telemetry Monitoring" color="#92C79A" fillcolor="#E8F0EA" shape=predefinedprocess style=filled]
+	S0 [label="" color="#92C79A" fillcolor="#E8F0EA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#F8BBD0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FF8A65" fillcolor="#FBE9E7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FF8A65" fillcolor="#FBE9E7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Ground Station Operations {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Ground Station Operations"
+		nest0_0 [label="Astronaut Training" color="#FF8A65" fillcolor="#FBE9E7" shape=rectangle style=filled]
+		nest0_1 [label="Re_entry Vehicle Design" color="#92C79A" fillcolor="#E8F0EA" shape=parallelogram style=filled]
+		nest0_2 [label="Autonomous Rendezvous and Docking" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	}
+	subgraph cluster_Commercial Space Flight Regulation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Commercial Space Flight Regulation"
+		nest1_0 [label="New Space Technology Development" color="#E91E63" fillcolor="#F8BBD0" shape=diamond style=filled]
+		nest1_1 [label="Launch Vehicle Integration" color="#92C79A" fillcolor="#E8F0EA" shape=rectangle style=filled]
+		nest1_2 [label="Sample Return Missions" color="#92C79A" fillcolor="#E8F0EA" shape=document style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed label="licenses" dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N4 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N7 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S2 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	S2 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_118.dot b/test/diagrams/graph_hard/diagrams_118.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b2a3ed4cbb73a4ea59628b0a8ed3007e732193d9
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_118.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=RL
+	N0 [label="Indigenous Knowledge Integration" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N1 [label="Water Resource Management under Climate Change" color="#4FC3F7" fillcolor="#E1F5FE" shape=rectangle style=filled]
+	N2 [label="Solar Radiation Management Research" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N3 [label="Public Engagement on Climate" color="#4FC3F7" fillcolor="#E1F5FE" shape=diamond style=filled]
+	N4 [label="Ocean Acidification Studies" color="#CB9BE1" fillcolor="#F2E6F5" shape=diamond style=filled]
+	N5 [label="Greenhouse Gas Measurement" color="#CB9BE1" fillcolor="#F2E6F5" shape=multipledocuments style=filled]
+	N6 [label="Climate Modeling" color="#7E57C2" fillcolor="#D1C4E9" shape=rect style=filled]
+	N7 [label="Carbon Cycle Research" color="#4FC3F7" fillcolor="#E1F5FE" shape=rectangle style=filled]
+	N8 [label="Drought Monitoring and Forecasting" color="#4FC3F7" fillcolor="#E1F5FE" shape=database style=filled]
+	N9 [label="Data Collection" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N10 [label="Green Technology Incubation" color="#CB9BE1" fillcolor="#F2E6F5" shape=inputoutput style=filled]
+	N11 [label="Adaptation Strategy Development" color="#7E57C2" fillcolor="#D1C4E9" shape=rectangle style=filled]
+	S0 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Renewable Energy Potential Assessment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Renewable Energy Potential Assessment"
+		nest0_0 [label="Atmospheric Monitoring" color="#7E57C2" fillcolor="#D1C4E9" shape=preparation style=filled]
+		nest0_1 [label="Sea Level Rise Projection" color="#7E57C2" fillcolor="#D1C4E9" shape=inputoutput style=filled]
+		nest0_2 [label="Permafrost Thaw Assessment" color="#4FC3F7" fillcolor="#E1F5FE" shape=rect style=filled]
+		nest0_3 [label="Flood Risk Assessment" color="#7E57C2" fillcolor="#D1C4E9" shape=action style=filled]
+	}
+	subgraph cluster_Ice Sheet Dynamics {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Ice Sheet Dynamics"
+		nest1_0 [label="Climate Change Vulnerability Assessment" color="#7E57C2" fillcolor="#D1C4E9" shape=rectangle style=filled]
+		nest1_1 [label="Mitigation Technology Evaluation" color="#CB9BE1" fillcolor="#F2E6F5" shape=document style=filled]
+		nest1_2 [label="Ecological Footprint Calculation" color="#CB9BE1" fillcolor="#F2E6F5" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest0_0 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N10 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N7 -> S0 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N4 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_118.txt b/test/diagrams/graph_hard/diagrams_118.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3695b7cbf078a4f421fdde60bdcffff92f047174
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_118.txt
@@ -0,0 +1,26 @@
+<Atmospheric Monitoring, connectedTo, Sea Level Rise Projection>
+<Carbon Cycle Research, connectedTo, Adaptation Strategy Development>
+<Carbon Cycle Research, connectedTo, Drought Monitoring and Forecasting>
+<Carbon Cycle Research, connectedTo, Green Technology Incubation>
+<Climate Change Vulnerability Assessment, connectedTo, Mitigation Technology Evaluation>
+<Climate Modeling, connectedTo, Carbon Cycle Research>
+<Data Collection, connectedTo, Green Technology Incubation>
+<Drought Monitoring and Forecasting, connectedTo, Data Collection>
+<Ecological Footprint Calculation, connectedTo, Green Technology Incubation>
+<Flood Risk Assessment, connectedTo, Solar Radiation Management Research>
+<Green Technology Incubation, connectedTo, Adaptation Strategy Development>
+<Greenhouse Gas Measurement, connectedTo, Atmospheric Monitoring>
+<Greenhouse Gas Measurement, connectedTo, Climate Modeling>
+<Indigenous Knowledge Integration, connectedTo, Ocean Acidification Studies>
+<Indigenous Knowledge Integration, connectedTo, Water Resource Management under Climate Change>
+<Mitigation Technology Evaluation, connectedTo, Ecological Footprint Calculation>
+<Ocean Acidification Studies, connectedTo, Greenhouse Gas Measurement>
+<Permafrost Thaw Assessment, connectedTo, Flood Risk Assessment>
+<Public Engagement on Climate, connectedTo, Climate Change Vulnerability Assessment>
+<Public Engagement on Climate, connectedTo, Ocean Acidification Studies>
+<Sea Level Rise Projection, connectedTo, Permafrost Thaw Assessment>
+<Solar Radiation Management Research, connectedTo, Public Engagement on Climate>
+<Water Resource Management under Climate Change, connectedTo, Adaptation Strategy Development>
+<Water Resource Management under Climate Change, connectedTo, Data Collection>
+<Water Resource Management under Climate Change, connectedTo, Ocean Acidification Studies>
+<Water Resource Management under Climate Change, connectedTo, Solar Radiation Management Research>
diff --git a/test/diagrams/graph_hard/diagrams_119.dot b/test/diagrams/graph_hard/diagrams_119.dot
new file mode 100644
index 0000000000000000000000000000000000000000..929f4ff272539361144aecdea673db76fcc25c5f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_119.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=RL
+	N0 [label="Ocean Current Analysis" color="#FF5722" fillcolor="#FFCCBC" shape=predefinedprocess style=filled]
+	N1 [label="Ecosystem Response Modeling" color="#4285F4" fillcolor="#D0E0F8" shape=rectangle style=filled]
+	N2 [label="Climate Modeling" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N3 [label="Ocean Acidification Studies" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N4 [label="Greenhouse Gas Measurement" color="#4285F4" fillcolor="#D0E0F8" shape=database style=filled]
+	N5 [label="Climate Finance Tracking" color="#FFEB3B" fillcolor="#FFF9C4" shape=multipledocuments style=filled]
+	N6 [label="Aerosol Impact Assessment" color="#4285F4" fillcolor="#D0E0F8" shape=database style=filled]
+	N7 [label="Water Resource Management under Climate Change" color="#4285F4" fillcolor="#D0E0F8" shape=parallelogram style=filled]
+	N8 [label="Adaptation Strategy Development" color="#4285F4" fillcolor="#D0E0F8" shape=rectangle style=filled]
+	N9 [label="Environmental Justice Study" color="#FF5722" fillcolor="#FFCCBC" shape=preparation style=filled]
+	S1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FF5722" fillcolor="#FFCCBC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#4285F4" fillcolor="#D0E0F8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Glacier Mass Balance Monitoring {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Glacier Mass Balance Monitoring"
+		nest0_0 [label="Biodiversity Impact Assessment" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+		nest0_1 [label="Flood Risk Assessment" color="#FFEB3B" fillcolor="#FFF9C4" shape=parallelogram style=filled]
+		nest0_2 [label="Renewable Energy Potential Assessment" color="#FFEB3B" fillcolor="#FFF9C4" shape=inputoutput style=filled]
+		nest0_3 [label="Climate Resilient Agriculture" color="#FFEB3B" fillcolor="#FFF9C4" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Remote Sensing for Climate {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Remote Sensing for Climate"
+		nest1_0 [label="Drought Monitoring and Forecasting" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+		nest1_1 [label="Climate Impact Assessment" color="#FFEB3B" fillcolor="#FFF9C4" shape=rect style=filled]
+		nest1_2 [label="Carbon Sequestration Technologies" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+		nest1_3 [label="Permafrost Thaw Assessment" color="#FF5722" fillcolor="#FFCCBC" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#4285F4" penwidth=1.5 style=dashed label="observes" dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFEB3B" penwidth=1.5 style=solid label="measures" dir=forward]
+	N5 -> N6 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N9 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N3 -> S1 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	M1 -> N6 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#000000" penwidth=1.5 style=solid label="validates" dir=forward]
+	N5 -> M2 [color="#000000" penwidth=1.5 style=solid label="attributes" dir=forward]
+	M2 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_12.dot b/test/diagrams/graph_hard/diagrams_12.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f0a335c7f3ebff54769b9ec95c265a93c9a1403a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_12.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=BT
+	N0 [label="Student Enrollment" color="#DCE775" fillcolor="#FCFCE7" shape=rectangle style=filled]
+	N1 [label="Course Selection" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+	N2 [label="Assignment Submission" color="#E57373" fillcolor="#FFEBEE" shape=database style=filled]
+	N3 [label="Graduation Approval" color="#E57373" fillcolor="#FFEBEE" shape=action style=filled]
+	N4 [label="Peer Tutoring" color="#CB9BE1" fillcolor="#F2E6F5" shape=diamond style=filled]
+	N5 [label="Academic Review" color="#CB9BE1" fillcolor="#F2E6F5" shape=document style=filled]
+	N6 [label="Internship Coordination" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N7 [label="Grade Entry" color="#CB9BE1" fillcolor="#F2E6F5" shape=inputoutput style=filled]
+	N8 [label="Thesis Submission" color="#CB9BE1" fillcolor="#F2E6F5" shape=preparation style=filled]
+	N9 [label="Timetable Scheduling" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+	N10 [label="Field Trip Coordination" color="#DCE775" fillcolor="#FCFCE7" shape=action style=filled]
+	N11 [label="Result Declaration" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N12 [label="Research Grant Application" color="#E57373" fillcolor="#FFEBEE" shape=vnode_shape style=filled]
+	S0 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#FCFCE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Career Services {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Career Services"
+		nest0_0 [label="Student Feedback Collection" color="#E57373" fillcolor="#FFEBEE" shape=vnode_shape style=filled]
+		nest0_1 [label="Extracurricular Activity" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Disciplinary Action {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Disciplinary Action"
+		nest1_0 [label="Curriculum Development" color="#DCE775" fillcolor="#FCFCE7" shape=preparation style=filled]
+		nest1_1 [label="Transcript Issuance" color="#CB9BE1" fillcolor="#F2E6F5" shape=document style=filled]
+		nest1_2 [label="Document Verification" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+		nest1_3 [label="Club Registration" color="#DCE775" fillcolor="#FCFCE7" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest0_0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N6 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> nest1_0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N2 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#DCE775" penwidth=1.5 style=solid label="submits" dir=forward]
+	N0 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#CB9BE1" penwidth=1.5 style=dashed label="grants" dir=forward]
+	S1 -> N11 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M2 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	M2 -> N11 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_12.txt b/test/diagrams/graph_hard/diagrams_12.txt
new file mode 100644
index 0000000000000000000000000000000000000000..998e50469f44c046e47dfc572d656a4d4e05ae31
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_12.txt
@@ -0,0 +1,28 @@
+<Academic Review, connectedTo, Internship Coordination>
+<Academic Review, connectedTo, Result Declaration>
+<Assignment Submission, connectedTo, Graduation Approval>
+<Assignment Submission, connectedTo, Result Declaration>
+<Assignment Submission, connectedTo, Timetable Scheduling>
+<Assignment Submission, submits, Peer Tutoring>
+<Club Registration, connectedTo, Assignment Submission>
+<Course Selection, connectedTo, Assignment Submission>
+<Curriculum Development, connectedTo, Transcript Issuance>
+<Document Verification, connectedTo, Club Registration>
+<Extracurricular Activity, connectedTo, Internship Coordination>
+<Field Trip Coordination, connectedTo, Result Declaration>
+<Grade Entry, connectedTo, Thesis Submission>
+<Graduation Approval, connectedTo, Peer Tutoring>
+<Internship Coordination, connectedTo, Grade Entry>
+<Peer Tutoring, connectedTo, Academic Review>
+<Peer Tutoring, connectedTo, Student Feedback Collection>
+<Result Declaration, connectedTo, Curriculum Development>
+<Result Declaration, connectedTo, Research Grant Application>
+<Student Enrollment, connectedTo, Course Selection>
+<Student Enrollment, connectedTo, Research Grant Application>
+<Student Enrollment, connectedTo, Result Declaration>
+<Student Enrollment, grants, Timetable Scheduling>
+<Student Feedback Collection, connectedTo, Extracurricular Activity>
+<Thesis Submission, connectedTo, Timetable Scheduling>
+<Timetable Scheduling, connectedTo, Field Trip Coordination>
+<Timetable Scheduling, connectedTo, Result Declaration>
+<Transcript Issuance, connectedTo, Document Verification>
diff --git a/test/diagrams/graph_hard/diagrams_120.dot b/test/diagrams/graph_hard/diagrams_120.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8c9f8906584587e9657f6bb2dfe111b2b9870e99
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_120.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=RL
+	N0 [label="Data Collection" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+	N1 [label="Public Engagement on Climate" color="#B0C5CD" fillcolor="#DFE7EB" shape=database style=filled]
+	N2 [label="Ecosystem Response Modeling" color="#6FE1D5" fillcolor="#C9EFEC" shape=rect style=filled]
+	N3 [label="Climate Education Programs" color="#6FE1D5" fillcolor="#C9EFEC" shape=predefinedprocess style=filled]
+	N4 [label="Ocean Acidification Studies" color="#6FE1D5" fillcolor="#C9EFEC" shape=parallelogram style=filled]
+	N5 [label="Water Resource Management under Climate Change" color="#6FE1D5" fillcolor="#C9EFEC" shape=rectangle style=filled]
+	N6 [label="Greenhouse Gas Measurement" color="#FFF8A6" fillcolor="#FFFDE0" shape=rect style=filled]
+	N7 [label="Ice Sheet Dynamics" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N8 [label="Extreme Weather Event Analysis" color="#FFF8A6" fillcolor="#FFFDE0" shape=database style=filled]
+	N9 [label="Climate Finance Tracking" color="#6FE1D5" fillcolor="#C9EFEC" shape=multipledocuments style=filled]
+	N10 [label="Paleoclimate Reconstruction" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N11 [label="Ecological Footprint Calculation" color="#B0C5CD" fillcolor="#DFE7EB" shape=predefinedprocess style=filled]
+	S0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Arctic and Antarctic Research {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Arctic and Antarctic Research"
+		nest0_0 [label="Green Technology Incubation" color="#6FE1D5" fillcolor="#C9EFEC" shape=parallelogram style=filled]
+		nest0_1 [label="Drought Monitoring and Forecasting" color="#FFF8A6" fillcolor="#FFFDE0" shape=preparation style=filled]
+	}
+	subgraph cluster_Permafrost Thaw Assessment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Permafrost Thaw Assessment"
+		nest1_0 [label="Ocean Current Analysis" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+		nest1_1 [label="Satellite Data Interpretation" color="#B0C5CD" fillcolor="#DFE7EB" shape=action style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed label="strategies" dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#B0C5CD" penwidth=1.5 style=dashed label="educates" dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid label="simulates" dir=forward]
+	nest0_0 -> nest0_1 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N10 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N11 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S0 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S2 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#B0C5CD" penwidth=1.5 style=dashed label="analyzes" dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_120.txt b/test/diagrams/graph_hard/diagrams_120.txt
new file mode 100644
index 0000000000000000000000000000000000000000..03c4da56cf46fe21e67457a098d858a239f97e8b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_120.txt
@@ -0,0 +1,27 @@
+<Climate Education Programs, connectedTo, Ecological Footprint Calculation>
+<Climate Education Programs, connectedTo, Ocean Acidification Studies>
+<Climate Education Programs, connectedTo, Water Resource Management under Climate Change>
+<Climate Finance Tracking, connectedTo, Paleoclimate Reconstruction>
+<Data Collection, connectedTo, Public Engagement on Climate>
+<Drought Monitoring and Forecasting, connectedTo, Paleoclimate Reconstruction>
+<Ecosystem Response Modeling, connectedTo, Climate Education Programs>
+<Ecosystem Response Modeling, connectedTo, Green Technology Incubation>
+<Extreme Weather Event Analysis, connectedTo, Climate Finance Tracking>
+<Extreme Weather Event Analysis, connectedTo, Ecological Footprint Calculation>
+<Extreme Weather Event Analysis, connectedTo, Paleoclimate Reconstruction>
+<Green Technology Incubation, connectedTo, Drought Monitoring and Forecasting>
+<Greenhouse Gas Measurement, educates, Ice Sheet Dynamics>
+<Ice Sheet Dynamics, connectedTo, Extreme Weather Event Analysis>
+<Ocean Acidification Studies, connectedTo, Ecological Footprint Calculation>
+<Ocean Acidification Studies, connectedTo, Water Resource Management under Climate Change>
+<Ocean Current Analysis, connectedTo, Satellite Data Interpretation>
+<Paleoclimate Reconstruction, simulates, Ecological Footprint Calculation>
+<Public Engagement on Climate, analyzes, Water Resource Management under Climate Change>
+<Public Engagement on Climate, connectedTo, Ocean Current Analysis>
+<Public Engagement on Climate, strategies, Ecosystem Response Modeling>
+<Satellite Data Interpretation, connectedTo, Ecological Footprint Calculation>
+<Water Resource Management under Climate Change, connectedTo, Climate Finance Tracking>
+<Water Resource Management under Climate Change, connectedTo, Ecological Footprint Calculation>
+<Water Resource Management under Climate Change, connectedTo, Extreme Weather Event Analysis>
+<Water Resource Management under Climate Change, connectedTo, Greenhouse Gas Measurement>
+<Water Resource Management under Climate Change, connectedTo, Paleoclimate Reconstruction>
diff --git a/test/diagrams/graph_hard/diagrams_121.dot b/test/diagrams/graph_hard/diagrams_121.dot
new file mode 100644
index 0000000000000000000000000000000000000000..277e9e461ea5d36bd30071f11f846c18c2245528
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_121.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=TB
+	N0 [label="Temperature Monitoring" color="#00BCD4" fillcolor="#B2EBF2" shape=predefinedprocess style=filled]
+	N1 [label="Storm Tracking" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N2 [label="Air Quality Forecasting" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+	N3 [label="Hurricane Trajectory Modeling" color="#FFCC80" fillcolor="#FFF0CC" shape=diamond style=filled]
+	N4 [label="Snowfall Measurement" color="#00BCD4" fillcolor="#B2EBF2" shape=rectangle style=filled]
+	N5 [label="Fire Weather Forecasting" color="#00BCD4" fillcolor="#B2EBF2" shape=vnode_shape style=filled]
+	N6 [label="Boundary Layer Study" color="#F44336" fillcolor="#FFCDD2" shape=action style=filled]
+	N7 [label="Humidity Sensing" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N8 [label="Precipitation Measurement" color="#00BCD4" fillcolor="#B2EBF2" shape=action style=filled]
+	N9 [label="Marine Weather Forecast" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+	N10 [label="Tornado Watch or Warning" color="#00BCD4" fillcolor="#B2EBF2" shape=parallelogram style=filled]
+	N11 [label="Upper Air Chart Analysis" color="#F44336" fillcolor="#FFCDD2" shape=document style=filled]
+	N12 [label="Radar Imaging" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+	N13 [label="Weather Forecasting" color="#F44336" fillcolor="#FFCDD2" shape=preparation style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#F44336" fillcolor="#FFCDD2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Meteorological Station Maintenance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Meteorological Station Maintenance"
+		nest0_0 [label="Agricultural Weather Advisory" color="#00BCD4" fillcolor="#B2EBF2" shape=preparation style=filled]
+		nest0_1 [label="Climate Modeling" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+		nest0_2 [label="Pollution Dispersion Modeling" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+		nest0_3 [label="Flood Prediction" color="#FFCC80" fillcolor="#FFF0CC" shape=action style=filled]
+	}
+	subgraph cluster_Severe Weather Warning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Severe Weather Warning"
+		nest1_0 [label="Atmospheric Data Collection" color="#FFCC80" fillcolor="#FFF0CC" shape=action style=filled]
+		nest1_1 [label="Meteorological Instrument Calibration" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest1_2 [label="Ocean_Atmosphere Interaction Study" color="#FFCC80" fillcolor="#FFF0CC" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N10 -> nest0_0 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N6 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#FFCC80" penwidth=1.5 style=solid label="generates" dir=forward]
+	S0 -> N13 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N8 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#F44336" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#F44336" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_121.txt b/test/diagrams/graph_hard/diagrams_121.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4054807c44f5175217d0c81760652f6cd421315d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_121.txt
@@ -0,0 +1,29 @@
+<Agricultural Weather Advisory, connectedTo, Climate Modeling>
+<Air Quality Forecasting, connectedTo, Atmospheric Data Collection>
+<Air Quality Forecasting, connectedTo, Hurricane Trajectory Modeling>
+<Atmospheric Data Collection, connectedTo, Meteorological Instrument Calibration>
+<Boundary Layer Study, connectedTo, Humidity Sensing>
+<Climate Modeling, connectedTo, Pollution Dispersion Modeling>
+<Fire Weather Forecasting, connectedTo, Boundary Layer Study>
+<Fire Weather Forecasting, connectedTo, Humidity Sensing>
+<Flood Prediction, connectedTo, Boundary Layer Study>
+<Humidity Sensing, connectedTo, Precipitation Measurement>
+<Hurricane Trajectory Modeling, connectedTo, Snowfall Measurement>
+<Marine Weather Forecast, connectedTo, Tornado Watch or Warning>
+<Meteorological Instrument Calibration, connectedTo, Ocean_Atmosphere Interaction Study>
+<Ocean_Atmosphere Interaction Study, connectedTo, Storm Tracking>
+<Pollution Dispersion Modeling, connectedTo, Flood Prediction>
+<Precipitation Measurement, connectedTo, Marine Weather Forecast>
+<Precipitation Measurement, connectedTo, Tornado Watch or Warning>
+<Precipitation Measurement, connectedTo, Upper Air Chart Analysis>
+<Radar Imaging, connectedTo, Weather Forecasting>
+<Snowfall Measurement, connectedTo, Fire Weather Forecasting>
+<Snowfall Measurement, connectedTo, Humidity Sensing>
+<Storm Tracking, connectedTo, Air Quality Forecasting>
+<Storm Tracking, connectedTo, Boundary Layer Study>
+<Storm Tracking, connectedTo, Weather Forecasting>
+<Storm Tracking, generates, Radar Imaging>
+<Temperature Monitoring, connectedTo, Storm Tracking>
+<Tornado Watch or Warning, connectedTo, Agricultural Weather Advisory>
+<Tornado Watch or Warning, connectedTo, Upper Air Chart Analysis>
+<Upper Air Chart Analysis, connectedTo, Radar Imaging>
diff --git a/test/diagrams/graph_hard/diagrams_122.dot b/test/diagrams/graph_hard/diagrams_122.dot
new file mode 100644
index 0000000000000000000000000000000000000000..82db82ca98992dcebb01d8d3632b9b63dcb323cf
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_122.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=BT
+	N0 [label="Meteorological Instrument Calibration" color="#FF9800" fillcolor="#FFE0B2" shape=rectangle style=filled]
+	N1 [label="Aviation Weather Briefing" color="#FF9800" fillcolor="#FFE0B2" shape=rectangle style=filled]
+	N2 [label="Humidity Sensing" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N3 [label="Severe Weather Warning" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+	N4 [label="Climate Data Archiving" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N5 [label="Temperature Monitoring" color="#DCE775" fillcolor="#F9FBE7" shape=rect style=filled]
+	N6 [label="Synoptic Chart Analysis" color="#4285F4" fillcolor="#D0E0F8" shape=action style=filled]
+	N7 [label="Numerical Weather Prediction" color="#4285F4" fillcolor="#D0E0F8" shape=vnode_shape style=filled]
+	N8 [label="Climate Change Impact Study" color="#DCE775" fillcolor="#F9FBE7" shape=predefinedprocess style=filled]
+	N9 [label="Fire Weather Forecasting" color="#DCE775" fillcolor="#F9FBE7" shape=rectangle style=filled]
+	N10 [label="Seasonal Outlook Preparation" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	N11 [label="Upper Air Chart Analysis" color="#FF9800" fillcolor="#FFE0B2" shape=diamond style=filled]
+	N12 [label="Tropical Cyclone Analysis" color="#DCE775" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	N13 [label="Nowcasting" color="#DCE775" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N14 [label="Precipitation Measurement" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	N15 [label="Drought Monitoring" color="#FF9800" fillcolor="#FFE0B2" shape=action style=filled]
+	N16 [label="Pollution Dispersion Modeling" color="#4285F4" fillcolor="#D0E0F8" shape=action style=filled]
+	N17 [label="Satellite Meteorology" color="#4285F4" fillcolor="#D0E0F8" shape=database style=filled]
+	S0 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FF9800" fillcolor="#FFE0B2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#4285F4" fillcolor="#D0E0F8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Air Quality Forecasting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Air Quality Forecasting"
+		nest0_0 [label="Radar Imaging" color="#DCE775" fillcolor="#F9FBE7" shape=predefinedprocess style=filled]
+		nest0_1 [label="Atmospheric Data Collection" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+		nest0_2 [label="Public Weather Briefing" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+	}
+	subgraph cluster_Snowfall Measurement {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Snowfall Measurement"
+		nest1_0 [label="Mesoscale Meteorology" color="#DCE775" fillcolor="#F9FBE7" shape=database style=filled]
+		nest1_1 [label="Meteorological Station Maintenance" color="#4285F4" fillcolor="#D0E0F8" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#DCE775" penwidth=1.5 style=dashed label="studies" dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#DCE775" penwidth=1.5 style=dashed label="maintains" dir=forward]
+	N7 -> N8 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=dashed label="maps" dir=forward]
+	N16 -> N17 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#4285F4" penwidth=1.5 style=solid label="monitors" dir=forward]
+	N2 -> nest0_0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N14 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> nest1_0 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N6 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S0 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	S0 -> N16 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N12 -> S1 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N17 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#FF9800" penwidth=1.5 style=dashed label="validates" dir=forward]
+	N3 -> M0 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N5 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M1 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	M1 -> N10 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_122.txt b/test/diagrams/graph_hard/diagrams_122.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f50054ac2a5d28d828429870ff00bbbc957a6c6c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_122.txt
@@ -0,0 +1,35 @@
+<Atmospheric Data Collection, monitors, Public Weather Briefing>
+<Aviation Weather Briefing, connectedTo, Humidity Sensing>
+<Aviation Weather Briefing, connectedTo, Seasonal Outlook Preparation>
+<Aviation Weather Briefing, connectedTo, Temperature Monitoring>
+<Climate Change Impact Study, connectedTo, Fire Weather Forecasting>
+<Climate Change Impact Study, connectedTo, Seasonal Outlook Preparation>
+<Climate Data Archiving, studies, Temperature Monitoring>
+<Drought Monitoring, maps, Pollution Dispersion Modeling>
+<Fire Weather Forecasting, connectedTo, Seasonal Outlook Preparation>
+<Humidity Sensing, connectedTo, Radar Imaging>
+<Humidity Sensing, connectedTo, Severe Weather Warning>
+<Humidity Sensing, connectedTo, Temperature Monitoring>
+<Mesoscale Meteorology, connectedTo, Meteorological Station Maintenance>
+<Meteorological Instrument Calibration, connectedTo, Aviation Weather Briefing>
+<Meteorological Instrument Calibration, validates, Temperature Monitoring>
+<Meteorological Station Maintenance, connectedTo, Synoptic Chart Analysis>
+<Nowcasting, connectedTo, Mesoscale Meteorology>
+<Nowcasting, connectedTo, Precipitation Measurement>
+<Numerical Weather Prediction, connectedTo, Climate Change Impact Study>
+<Numerical Weather Prediction, connectedTo, Pollution Dispersion Modeling>
+<Numerical Weather Prediction, connectedTo, Seasonal Outlook Preparation>
+<Numerical Weather Prediction, connectedTo, Tropical Cyclone Analysis>
+<Pollution Dispersion Modeling, connectedTo, Satellite Meteorology>
+<Precipitation Measurement, connectedTo, Drought Monitoring>
+<Public Weather Briefing, connectedTo, Precipitation Measurement>
+<Radar Imaging, connectedTo, Atmospheric Data Collection>
+<Seasonal Outlook Preparation, connectedTo, Upper Air Chart Analysis>
+<Severe Weather Warning, connectedTo, Climate Data Archiving>
+<Severe Weather Warning, connectedTo, Temperature Monitoring>
+<Synoptic Chart Analysis, maintains, Numerical Weather Prediction>
+<Temperature Monitoring, connectedTo, Synoptic Chart Analysis>
+<Tropical Cyclone Analysis, connectedTo, Nowcasting>
+<Tropical Cyclone Analysis, connectedTo, Precipitation Measurement>
+<Tropical Cyclone Analysis, connectedTo, Satellite Meteorology>
+<Upper Air Chart Analysis, connectedTo, Tropical Cyclone Analysis>
diff --git a/test/diagrams/graph_hard/diagrams_123.txt b/test/diagrams/graph_hard/diagrams_123.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1170e099fd8fa087c3398dcd79445e938bc7f445
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_123.txt
@@ -0,0 +1,29 @@
+<Air Quality Forecasting, connectedTo, Upper Air Chart Analysis>
+<Air Quality Forecasting, connectedTo, Weather Forecasting>
+<Aviation Weather Briefing, connectedTo, Wind Speed and Direction>
+<Climate Data Archiving, connectedTo, Precipitation Measurement>
+<Climate Data Archiving, connectedTo, Public Weather Briefing>
+<Cloud Observation, connectedTo, Severe Weather Warning>
+<Cloud Observation, warns, Aviation Weather Briefing>
+<Drought Monitoring, connectedTo, Cloud Observation>
+<Flood Prediction, connectedTo, Pollution Dispersion Modeling>
+<Humidity Sensing, connectedTo, Flood Prediction>
+<Humidity Sensing, connectedTo, Nowcasting>
+<Humidity Sensing, connectedTo, Precipitation Measurement>
+<Marine Weather Forecast, connectedTo, Air Quality Forecasting>
+<Marine Weather Forecast, connectedTo, Weather Forecasting>
+<Meteorological Instrument Calibration, connectedTo, Snowfall Measurement>
+<Nowcasting, connectedTo, Meteorological Instrument Calibration>
+<Pollution Dispersion Modeling, interprets, Storm Tracking>
+<Precipitation Measurement, connectedTo, Drought Monitoring>
+<Public Weather Briefing, connectedTo, Humidity Sensing>
+<Public Weather Briefing, connectedTo, Weather Forecasting>
+<Radar Imaging, connectedTo, Marine Weather Forecast>
+<Severe Weather Warning, connectedTo, Drought Monitoring>
+<Snowfall Measurement, connectedTo, Marine Weather Forecast>
+<Storm Tracking, connectedTo, Marine Weather Forecast>
+<Storm Tracking, connectedTo, Weather Forecasting>
+<Upper Air Chart Analysis, connectedTo, Weather Forecasting>
+<Weather Forecasting, connectedTo, Precipitation Measurement>
+<Wind Speed and Direction, calculates, Radar Imaging>
+<Wind Speed and Direction, connectedTo, Humidity Sensing>
diff --git a/test/diagrams/graph_hard/diagrams_124.dot b/test/diagrams/graph_hard/diagrams_124.dot
new file mode 100644
index 0000000000000000000000000000000000000000..78b40378216ef5384522ffdc56a853724edf4c17
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_124.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=RL
+	N0 [label="Recycling Processing" color="#B0C5CD" fillcolor="#DFE7EB" shape=rectangle style=filled]
+	N1 [label="Landfill Operation" color="#F06292" fillcolor="#FCE4EC" shape=document style=filled]
+	N2 [label="Waste Logistics Optimization" color="#B0C5CD" fillcolor="#DFE7EB" shape=rect style=filled]
+	N3 [label="Electronic Waste Recycling" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N4 [label="Biomedical Waste Handling" color="#B0C5CD" fillcolor="#DFE7EB" shape=vnode_shape style=filled]
+	N5 [label="Waste Audit" color="#B0C5CD" fillcolor="#DFE7EB" shape=rectangle style=filled]
+	N6 [label="Waste Incineration" color="#FBC02D" fillcolor="#FFFDE7" shape=vnode_shape style=filled]
+	N7 [label="Smart Waste Bins" color="#F06292" fillcolor="#FCE4EC" shape=inputoutput style=filled]
+	N8 [label="Hazardous Waste Disposal" color="#FBC02D" fillcolor="#FFFDE7" shape=action style=filled]
+	N9 [label="Waste Collection" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+	N10 [label="Transfer Station Management" color="#B0C5CD" fillcolor="#DFE7EB" shape=vnode_shape style=filled]
+	N11 [label="Resource Recovery" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N12 [label="Waste Compaction" color="#FBC02D" fillcolor="#FFFDE7" shape=preparation style=filled]
+	N13 [label="Waste Management Policy Development" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+	N14 [label="Glass Recycling" color="#F06292" fillcolor="#FCE4EC" shape=rectangle style=filled]
+	N15 [label="Public Education on Waste" color="#FBC02D" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+	S0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FBC02D" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FBC02D" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Community Recycling Programs {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Community Recycling Programs"
+		nest0_0 [label="Composting" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+		nest0_1 [label="Metal Recycling" color="#F06292" fillcolor="#FCE4EC" shape=preparation style=filled]
+		nest0_2 [label="Waste_to_Energy Conversion" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+		nest0_3 [label="Waste Management Data Analytics" color="#B0C5CD" fillcolor="#DFE7EB" shape=database style=filled]
+	}
+	subgraph cluster_Waste Reduction Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Waste Reduction Planning"
+		nest1_0 [label="Organics Collection" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+		nest1_1 [label="Plastic Recycling Technologies" color="#FBC02D" fillcolor="#FFFDE7" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#B0C5CD" penwidth=1.5 style=solid label="treats" dir=forward]
+	N12 -> N13 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid label="maintains" dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest0_0 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N8 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N5 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N11 -> S0 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S2 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	S2 -> N4 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#B0C5CD" penwidth=1.5 style=dashed label="plans" dir=forward]
+	M1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	M2 -> N4 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_124.txt b/test/diagrams/graph_hard/diagrams_124.txt
new file mode 100644
index 0000000000000000000000000000000000000000..46def077ba36e0b206ddf6a1de8d9b58c9019c06
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_124.txt
@@ -0,0 +1,34 @@
+<Biomedical Waste Handling, connectedTo, Waste Audit>
+<Composting, connectedTo, Metal Recycling>
+<Electronic Waste Recycling, connectedTo, Biomedical Waste Handling>
+<Glass Recycling, connectedTo, Public Education on Waste>
+<Hazardous Waste Disposal, connectedTo, Organics Collection>
+<Hazardous Waste Disposal, connectedTo, Waste Collection>
+<Landfill Operation, connectedTo, Biomedical Waste Handling>
+<Landfill Operation, connectedTo, Smart Waste Bins>
+<Landfill Operation, connectedTo, Transfer Station Management>
+<Landfill Operation, connectedTo, Waste Audit>
+<Landfill Operation, connectedTo, Waste Logistics Optimization>
+<Metal Recycling, maintains, Waste_to_Energy Conversion>
+<Organics Collection, connectedTo, Plastic Recycling Technologies>
+<Plastic Recycling Technologies, connectedTo, Waste Audit>
+<Recycling Processing, connectedTo, Biomedical Waste Handling>
+<Recycling Processing, connectedTo, Landfill Operation>
+<Recycling Processing, plans, Biomedical Waste Handling>
+<Resource Recovery, connectedTo, Public Education on Waste>
+<Resource Recovery, connectedTo, Waste Management Policy Development>
+<Resource Recovery, treats, Waste Compaction>
+<Smart Waste Bins, connectedTo, Hazardous Waste Disposal>
+<Transfer Station Management, connectedTo, Composting>
+<Transfer Station Management, connectedTo, Resource Recovery>
+<Waste Audit, connectedTo, Waste Incineration>
+<Waste Collection, connectedTo, Transfer Station Management>
+<Waste Compaction, connectedTo, Waste Management Policy Development>
+<Waste Incineration, connectedTo, Glass Recycling>
+<Waste Incineration, connectedTo, Resource Recovery>
+<Waste Incineration, connectedTo, Smart Waste Bins>
+<Waste Logistics Optimization, connectedTo, Biomedical Waste Handling>
+<Waste Logistics Optimization, connectedTo, Electronic Waste Recycling>
+<Waste Management Data Analytics, connectedTo, Hazardous Waste Disposal>
+<Waste Management Policy Development, connectedTo, Glass Recycling>
+<Waste_to_Energy Conversion, connectedTo, Waste Management Data Analytics>
diff --git a/test/diagrams/graph_hard/diagrams_125.dot b/test/diagrams/graph_hard/diagrams_125.dot
new file mode 100644
index 0000000000000000000000000000000000000000..74a2267bec09d175a084e217614973af96a923a8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_125.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=RL
+	N0 [label="Waste Incineration" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N1 [label="Illegal Dumping Monitoring" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N2 [label="Recycling Processing" color="#BA68C8" fillcolor="#F3E5F5" shape=database style=filled]
+	N3 [label="Anaerobic Digestion" color="#5C6BC0" fillcolor="#E8EAF6" shape=document style=filled]
+	N4 [label="Waste Characterization Study" color="#5C6BC0" fillcolor="#E8EAF6" shape=rectangle style=filled]
+	N5 [label="Waste Management Data Analytics" color="#5C6BC0" fillcolor="#E8EAF6" shape=document style=filled]
+	N6 [label="Waste Reduction Planning" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N7 [label="Circular Economy Initiatives" color="#6EB76D" fillcolor="#E9F7E8" shape=vnode_shape style=filled]
+	N8 [label="Composting" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N9 [label="Closed_Loop Systems" color="#BA68C8" fillcolor="#F3E5F5" shape=preparation style=filled]
+	N10 [label="Resource Recovery" color="#6EB76D" fillcolor="#E9F7E8" shape=multipledocuments style=filled]
+	N11 [label="Extended Producer Responsibility" color="#5C6BC0" fillcolor="#E8EAF6" shape=vnode_shape style=filled]
+	N12 [label="Waste Logistics Optimization" color="#5C6BC0" fillcolor="#E8EAF6" shape=database style=filled]
+	N13 [label="Waste Collection" color="#6EB76D" fillcolor="#E9F7E8" shape=predefinedprocess style=filled]
+	N14 [label="Biomedical Waste Handling" color="#BA68C8" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N15 [label="Zero Waste Initiatives" color="#6EB76D" fillcolor="#E9F7E8" shape=hexagon style=filled]
+	S0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Textile Recycling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Textile Recycling"
+		nest0_0 [label="Metal Recycling" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+		nest0_1 [label="Landfill Gas Collection" color="#BA68C8" fillcolor="#F3E5F5" shape=rect style=filled]
+		nest0_2 [label="Glass Recycling" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+		nest0_3 [label="Electronic Waste Recycling" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	}
+	subgraph cluster_Container Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Container Management"
+		nest1_0 [label="Leachate Treatment" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+		nest1_1 [label="Hazardous Waste Disposal" color="#5C6BC0" fillcolor="#E8EAF6" shape=action style=filled]
+		nest1_2 [label="Waste_to_Energy Conversion" color="#6EB76D" fillcolor="#E9F7E8" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#BA68C8" penwidth=1.5 style=solid label="reduces" dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#5C6BC0" penwidth=1.5 style=solid label="controls" dir=forward]
+	N11 -> N12 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest0_0 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N12 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid label="enforces" dir=forward]
+	N13 -> nest1_0 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> S0 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N10 -> S1 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#5C6BC0" penwidth=1.5 style=dashed label="incinerates" dir=forward]
+	N9 -> M0 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N12 -> M0 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	M0 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	M1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_125.txt b/test/diagrams/graph_hard/diagrams_125.txt
new file mode 100644
index 0000000000000000000000000000000000000000..246dddf9f7ac1164bee6c774f5592f01c3e3ea2b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_125.txt
@@ -0,0 +1,35 @@
+<Anaerobic Digestion, connectedTo, Waste Characterization Study>
+<Biomedical Waste Handling, connectedTo, Zero Waste Initiatives>
+<Circular Economy Initiatives, reduces, Composting>
+<Closed_Loop Systems, connectedTo, Biomedical Waste Handling>
+<Closed_Loop Systems, connectedTo, Resource Recovery>
+<Composting, connectedTo, Closed_Loop Systems>
+<Composting, connectedTo, Metal Recycling>
+<Electronic Waste Recycling, connectedTo, Waste Logistics Optimization>
+<Extended Producer Responsibility, connectedTo, Waste Collection>
+<Extended Producer Responsibility, connectedTo, Waste Logistics Optimization>
+<Extended Producer Responsibility, connectedTo, Zero Waste Initiatives>
+<Glass Recycling, connectedTo, Electronic Waste Recycling>
+<Hazardous Waste Disposal, enforces, Waste_to_Energy Conversion>
+<Illegal Dumping Monitoring, connectedTo, Recycling Processing>
+<Illegal Dumping Monitoring, connectedTo, Waste Characterization Study>
+<Landfill Gas Collection, connectedTo, Glass Recycling>
+<Leachate Treatment, connectedTo, Hazardous Waste Disposal>
+<Metal Recycling, connectedTo, Landfill Gas Collection>
+<Recycling Processing, connectedTo, Anaerobic Digestion>
+<Recycling Processing, connectedTo, Waste Characterization Study>
+<Resource Recovery, connectedTo, Waste Collection>
+<Resource Recovery, connectedTo, Waste Logistics Optimization>
+<Resource Recovery, connectedTo, Zero Waste Initiatives>
+<Resource Recovery, controls, Extended Producer Responsibility>
+<Waste Characterization Study, connectedTo, Waste Management Data Analytics>
+<Waste Collection, connectedTo, Biomedical Waste Handling>
+<Waste Collection, connectedTo, Leachate Treatment>
+<Waste Incineration, connectedTo, Illegal Dumping Monitoring>
+<Waste Incineration, incinerates, Biomedical Waste Handling>
+<Waste Logistics Optimization, connectedTo, Biomedical Waste Handling>
+<Waste Logistics Optimization, connectedTo, Waste Collection>
+<Waste Management Data Analytics, connectedTo, Waste Reduction Planning>
+<Waste Reduction Planning, connectedTo, Biomedical Waste Handling>
+<Waste Reduction Planning, connectedTo, Circular Economy Initiatives>
+<Waste_to_Energy Conversion, connectedTo, Illegal Dumping Monitoring>
diff --git a/test/diagrams/graph_hard/diagrams_126.dot b/test/diagrams/graph_hard/diagrams_126.dot
new file mode 100644
index 0000000000000000000000000000000000000000..35659ea46775fd8a412fa83621acfdd1ce34cb9f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_126.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=RL
+	N0 [label="Smart Waste Bins" color="#D2D2D2" fillcolor="#F0F0F0" shape=inputoutput style=filled]
+	N1 [label="Paper Recycling" color="#D2D2D2" fillcolor="#F0F0F0" shape=rect style=filled]
+	N2 [label="Circular Economy Initiatives" color="#FFEB3B" fillcolor="#FFF9C4" shape=preparation style=filled]
+	N3 [label="Waste Compaction" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N4 [label="Waste Management Data Analytics" color="#FFE69C" fillcolor="#FFF9D4" shape=inputoutput style=filled]
+	N5 [label="Resource Recovery" color="#FFEB3B" fillcolor="#FFF9C4" shape=parallelogram style=filled]
+	N6 [label="Biomedical Waste Handling" color="#FFE69C" fillcolor="#FFF9D4" shape=vnode_shape style=filled]
+	N7 [label="Community Recycling Programs" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N8 [label="Composting" color="#D2D2D2" fillcolor="#F0F0F0" shape=diamond style=filled]
+	N9 [label="Closed_Loop Systems" color="#FFE69C" fillcolor="#FFF9D4" shape=diamond style=filled]
+	N10 [label="Illegal Dumping Monitoring" color="#D2D2D2" fillcolor="#F0F0F0" shape=database style=filled]
+	N11 [label="Glass Recycling" color="#FFE69C" fillcolor="#FFF9D4" shape=inputoutput style=filled]
+	N12 [label="Container Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=preparation style=filled]
+	N13 [label="Organics Collection" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N14 [label="Public Education on Waste" color="#FFE69C" fillcolor="#FFF9D4" shape=preparation style=filled]
+	S0 [label="" color="#FFE69C" fillcolor="#FFF9D4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFE69C" fillcolor="#FFF9D4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFE69C" fillcolor="#FFF9D4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFE69C" fillcolor="#FFF9D4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Leachate Treatment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Leachate Treatment"
+		nest0_0 [label="Waste Collection" color="#D2D2D2" fillcolor="#F0F0F0" shape=rect style=filled]
+		nest0_1 [label="Recycling Processing" color="#FFE69C" fillcolor="#FFF9D4" shape=action style=filled]
+		nest0_2 [label="Electronic Waste Recycling" color="#FFE69C" fillcolor="#FFF9D4" shape=rect style=filled]
+		nest0_3 [label="Anaerobic Digestion" color="#D2D2D2" fillcolor="#F0F0F0" shape=hexagon style=filled]
+	}
+	subgraph cluster_Landfill Gas Collection {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Landfill Gas Collection"
+		nest1_0 [label="Extended Producer Responsibility" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+		nest1_1 [label="Textile Recycling" color="#D2D2D2" fillcolor="#F0F0F0" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFE69C" penwidth=1.5 style=dashed label="recycles" dir=forward]
+	N4 -> N5 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid label="licenses" dir=forward]
+	N7 -> N8 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#000000" penwidth=1.5 style=solid label="educates" dir=forward]
+	nest0_3 -> N5 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> nest1_0 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N7 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#FFE69C" penwidth=1.5 style=solid label="controls" dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> S1 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#D2D2D2" penwidth=1.5 style=dashed label="develops" dir=forward]
+	N8 -> S2 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N14 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	S2 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#FFEB3B" penwidth=1.5 style=dashed label="processes" dir=forward]
+	N4 -> M0 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N7 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_126.txt b/test/diagrams/graph_hard/diagrams_126.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9e96784772f412d44d322d180e4e16f3fa36e2f7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_126.txt
@@ -0,0 +1,31 @@
+<Anaerobic Digestion, connectedTo, Resource Recovery>
+<Biomedical Waste Handling, educates, Waste Collection>
+<Biomedical Waste Handling, licenses, Community Recycling Programs>
+<Circular Economy Initiatives, connectedTo, Waste Compaction>
+<Closed_Loop Systems, connectedTo, Illegal Dumping Monitoring>
+<Community Recycling Programs, connectedTo, Composting>
+<Community Recycling Programs, connectedTo, Organics Collection>
+<Community Recycling Programs, controls, Closed_Loop Systems>
+<Composting, connectedTo, Closed_Loop Systems>
+<Composting, connectedTo, Container Management>
+<Composting, connectedTo, Organics Collection>
+<Composting, connectedTo, Public Education on Waste>
+<Container Management, connectedTo, Organics Collection>
+<Electronic Waste Recycling, connectedTo, Anaerobic Digestion>
+<Extended Producer Responsibility, connectedTo, Textile Recycling>
+<Glass Recycling, connectedTo, Container Management>
+<Glass Recycling, connectedTo, Extended Producer Responsibility>
+<Illegal Dumping Monitoring, connectedTo, Glass Recycling>
+<Illegal Dumping Monitoring, connectedTo, Public Education on Waste>
+<Illegal Dumping Monitoring, develops, Container Management>
+<Organics Collection, connectedTo, Public Education on Waste>
+<Paper Recycling, connectedTo, Circular Economy Initiatives>
+<Recycling Processing, connectedTo, Electronic Waste Recycling>
+<Resource Recovery, connectedTo, Biomedical Waste Handling>
+<Smart Waste Bins, connectedTo, Paper Recycling>
+<Smart Waste Bins, processes, Community Recycling Programs>
+<Textile Recycling, connectedTo, Community Recycling Programs>
+<Waste Collection, connectedTo, Recycling Processing>
+<Waste Compaction, recycles, Waste Management Data Analytics>
+<Waste Management Data Analytics, connectedTo, Community Recycling Programs>
+<Waste Management Data Analytics, connectedTo, Resource Recovery>
diff --git a/test/diagrams/graph_hard/diagrams_127.dot b/test/diagrams/graph_hard/diagrams_127.dot
new file mode 100644
index 0000000000000000000000000000000000000000..19f498dc4dff8dbf428788604269ae1924adbf23
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_127.dot
@@ -0,0 +1,83 @@
+digraph {
+	rankdir=RL
+	N0 [label="Pollution Source Identification" color="#9C27B0" fillcolor="#E1BEE7" shape=rect style=filled]
+	N1 [label="Water Scarcity Mitigation" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+	N2 [label="Stormwater Management" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+	N3 [label="Desalination" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N4 [label="Greywater Recycling" color="#FFC107" fillcolor="#FFECB3" shape=multipledocuments style=filled]
+	N5 [label="Sewer System Inspection" color="#FFC107" fillcolor="#FFECB3" shape=predefinedprocess style=filled]
+	N6 [label="Climate Change Adaptation for Water" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N7 [label="Water Infrastructure Maintenance" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	N8 [label="Public Awareness Campaigns" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+	N9 [label="Reservoir Operation" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N10 [label="Water Source Identification" color="#90A4AE" fillcolor="#ECEFF1" shape=preparation style=filled]
+	N11 [label="Water Meter Reading" color="#9C27B0" fillcolor="#E1BEE7" shape=document style=filled]
+	N12 [label="Hydroelectric Power Generation" color="#FFC107" fillcolor="#FFECB3" shape=predefinedprocess style=filled]
+	N13 [label="Watershed Management" color="#FFC107" fillcolor="#FFECB3" shape=database style=filled]
+	N14 [label="Drought Management" color="#90A4AE" fillcolor="#ECEFF1" shape=vnode_shape style=filled]
+	N15 [label="Hydrological Modeling" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N16 [label="Rainwater Harvesting" color="#FFC107" fillcolor="#FFECB3" shape=diamond style=filled]
+	N17 [label="Irrigation Management" color="#9C27B0" fillcolor="#E1BEE7" shape=multipledocuments style=filled]
+	N18 [label="Transboundary Water Management" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+	S0 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFC107" fillcolor="#FFECB3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Water Treatment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Water Treatment"
+		nest0_0 [label="Ecosystem Protection" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+		nest0_1 [label="Water Resource Planning" color="#9C27B0" fillcolor="#E1BEE7" shape=document style=filled]
+	}
+	subgraph cluster_Piping Network Repair {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Piping Network Repair"
+		nest1_0 [label="Water Rights Management" color="#90A4AE" fillcolor="#ECEFF1" shape=rect style=filled]
+		nest1_1 [label="Water Distribution" color="#9C27B0" fillcolor="#E1BEE7" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#90A4AE" penwidth=1.5 style=solid label="permits" dir=forward]
+	N1 -> N2 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#90A4AE" penwidth=1.5 style=solid label="licenses" dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N17 -> N18 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N17 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N17 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N9 -> S0 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#FFC107" penwidth=1.5 style=dashed label="audits" dir=forward]
+	N12 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N18 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	S1 -> N17 [color="#000000" penwidth=1.5 style=solid label="recycles" dir=forward]
+	S1 -> N14 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N12 -> M0 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N14 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	M1 -> N6 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_127.txt b/test/diagrams/graph_hard/diagrams_127.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b9bab6adb3cb0e1a8a2565a615e0fb9cf28f7d2f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_127.txt
@@ -0,0 +1,36 @@
+<Climate Change Adaptation for Water, connectedTo, Water Infrastructure Maintenance>
+<Desalination, connectedTo, Climate Change Adaptation for Water>
+<Desalination, connectedTo, Greywater Recycling>
+<Desalination, connectedTo, Water Infrastructure Maintenance>
+<Drought Management, licenses, Hydrological Modeling>
+<Ecosystem Protection, connectedTo, Water Resource Planning>
+<Greywater Recycling, connectedTo, Climate Change Adaptation for Water>
+<Greywater Recycling, connectedTo, Sewer System Inspection>
+<Greywater Recycling, connectedTo, Water Infrastructure Maintenance>
+<Hydroelectric Power Generation, connectedTo, Drought Management>
+<Hydroelectric Power Generation, connectedTo, Transboundary Water Management>
+<Hydroelectric Power Generation, connectedTo, Watershed Management>
+<Hydroelectric Power Generation, recycles, Irrigation Management>
+<Hydrological Modeling, connectedTo, Rainwater Harvesting>
+<Irrigation Management, connectedTo, Transboundary Water Management>
+<Pollution Source Identification, permits, Water Scarcity Mitigation>
+<Public Awareness Campaigns, connectedTo, Reservoir Operation>
+<Rainwater Harvesting, connectedTo, Irrigation Management>
+<Reservoir Operation, audits, Hydrological Modeling>
+<Reservoir Operation, connectedTo, Water Meter Reading>
+<Reservoir Operation, connectedTo, Water Rights Management>
+<Reservoir Operation, connectedTo, Water Source Identification>
+<Sewer System Inspection, connectedTo, Climate Change Adaptation for Water>
+<Sewer System Inspection, connectedTo, Drought Management>
+<Stormwater Management, connectedTo, Desalination>
+<Water Distribution, connectedTo, Irrigation Management>
+<Water Infrastructure Maintenance, connectedTo, Public Awareness Campaigns>
+<Water Meter Reading, connectedTo, Hydroelectric Power Generation>
+<Water Resource Planning, connectedTo, Irrigation Management>
+<Water Rights Management, connectedTo, Water Distribution>
+<Water Scarcity Mitigation, connectedTo, Climate Change Adaptation for Water>
+<Water Scarcity Mitigation, connectedTo, Ecosystem Protection>
+<Water Scarcity Mitigation, connectedTo, Stormwater Management>
+<Water Scarcity Mitigation, connectedTo, Water Infrastructure Maintenance>
+<Water Source Identification, connectedTo, Water Meter Reading>
+<Watershed Management, connectedTo, Drought Management>
diff --git a/test/diagrams/graph_hard/diagrams_128.dot b/test/diagrams/graph_hard/diagrams_128.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e7126a43b821bff57e0990a9a9dce475861ba35b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_128.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=LR
+	N0 [label="Transboundary Water Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=predefinedprocess style=filled]
+	N1 [label="Groundwater Management" color="#C0CA33" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	N2 [label="Water Conservation Planning" color="#C0CA33" fillcolor="#F9FBE7" shape=predefinedprocess style=filled]
+	N3 [label="Public Awareness Campaigns" color="#C2B2F0" fillcolor="#EFE6FF" shape=predefinedprocess style=filled]
+	N4 [label="Smart Water Networks" color="#C0CA33" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	N5 [label="Stormwater Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=vnode_shape style=filled]
+	N6 [label="Aquifer Recharge" color="#C2B2F0" fillcolor="#EFE6FF" shape=rectangle style=filled]
+	N7 [label="Hydroelectric Power Generation" color="#A2D0FF" fillcolor="#E8F0FF" shape=multipledocuments style=filled]
+	N8 [label="Ecosystem Protection" color="#A2D0FF" fillcolor="#E8F0FF" shape=preparation style=filled]
+	N9 [label="Irrigation Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=vnode_shape style=filled]
+	N10 [label="Drinking Water Standards Compliance" color="#C2B2F0" fillcolor="#EFE6FF" shape=rectangle style=filled]
+	N11 [label="Desalination" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+	N12 [label="Hydrological Modeling" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N13 [label="Water Distribution" color="#C2B2F0" fillcolor="#EFE6FF" shape=inputoutput style=filled]
+	N14 [label="Water Rights Management" color="#C0CA33" fillcolor="#F9FBE7" shape=action style=filled]
+	N15 [label="Flood Control" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+	N16 [label="Water Treatment" color="#A2D0FF" fillcolor="#E8F0FF" shape=preparation style=filled]
+	N17 [label="Water Resource Planning" color="#A2D0FF" fillcolor="#E8F0FF" shape=action style=filled]
+	S0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#A2D0FF" fillcolor="#E8F0FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A2D0FF" fillcolor="#E8F0FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Reservoir Operation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Reservoir Operation"
+		nest0_0 [label="Sewer System Inspection" color="#C2B2F0" fillcolor="#EFE6FF" shape=rect style=filled]
+		nest0_1 [label="Piping Network Repair" color="#C2B2F0" fillcolor="#EFE6FF" shape=document style=filled]
+	}
+	subgraph cluster_Water Meter Reading {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Water Meter Reading"
+		nest1_0 [label="Water Scarcity Mitigation" color="#C2B2F0" fillcolor="#EFE6FF" shape=predefinedprocess style=filled]
+		nest1_1 [label="Greywater Recycling" color="#C0CA33" fillcolor="#F9FBE7" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#C0CA33" penwidth=1.5 style=dashed label="reports" dir=forward]
+	N8 -> N9 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#A2D0FF" penwidth=1.5 style=dashed label="filters" dir=forward]
+	N12 -> N13 [color="#C0CA33" penwidth=1.5 style=solid label="drains" dir=forward]
+	N13 -> N14 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest0_0 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N15 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N14 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N11 -> S0 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N17 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N7 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_128.txt b/test/diagrams/graph_hard/diagrams_128.txt
new file mode 100644
index 0000000000000000000000000000000000000000..babe2b06241f2cb9b535e5db234ee60ce3b81ba3
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_128.txt
@@ -0,0 +1,33 @@
+<Aquifer Recharge, connectedTo, Hydroelectric Power Generation>
+<Desalination, connectedTo, Water Distribution>
+<Desalination, connectedTo, Water Resource Planning>
+<Desalination, connectedTo, Water Rights Management>
+<Desalination, filters, Hydrological Modeling>
+<Drinking Water Standards Compliance, connectedTo, Desalination>
+<Ecosystem Protection, connectedTo, Irrigation Management>
+<Ecosystem Protection, connectedTo, Water Scarcity Mitigation>
+<Flood Control, connectedTo, Water Treatment>
+<Greywater Recycling, connectedTo, Water Rights Management>
+<Groundwater Management, connectedTo, Hydroelectric Power Generation>
+<Groundwater Management, connectedTo, Sewer System Inspection>
+<Groundwater Management, connectedTo, Water Conservation Planning>
+<Hydroelectric Power Generation, reports, Ecosystem Protection>
+<Hydrological Modeling, drains, Water Distribution>
+<Irrigation Management, connectedTo, Drinking Water Standards Compliance>
+<Piping Network Repair, connectedTo, Flood Control>
+<Public Awareness Campaigns, connectedTo, Hydroelectric Power Generation>
+<Public Awareness Campaigns, connectedTo, Smart Water Networks>
+<Sewer System Inspection, connectedTo, Piping Network Repair>
+<Smart Water Networks, connectedTo, Hydroelectric Power Generation>
+<Smart Water Networks, connectedTo, Stormwater Management>
+<Stormwater Management, connectedTo, Aquifer Recharge>
+<Stormwater Management, connectedTo, Water Distribution>
+<Stormwater Management, connectedTo, Water Rights Management>
+<Transboundary Water Management, connectedTo, Groundwater Management>
+<Transboundary Water Management, connectedTo, Hydroelectric Power Generation>
+<Water Conservation Planning, connectedTo, Hydroelectric Power Generation>
+<Water Conservation Planning, connectedTo, Public Awareness Campaigns>
+<Water Distribution, connectedTo, Water Rights Management>
+<Water Rights Management, connectedTo, Flood Control>
+<Water Scarcity Mitigation, connectedTo, Greywater Recycling>
+<Water Treatment, connectedTo, Water Resource Planning>
diff --git a/test/diagrams/graph_hard/diagrams_129.txt b/test/diagrams/graph_hard/diagrams_129.txt
new file mode 100644
index 0000000000000000000000000000000000000000..89976db26179d2d2b4cef4b78d5ed83350c9f5a1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_129.txt
@@ -0,0 +1,33 @@
+<Billing and Revenue Management, connectedTo, Industrial Water Use Optimization>
+<Dam Management, connectedTo, Desalination>
+<Dam Management, connectedTo, Hydroelectric Power Generation>
+<Dam Management, connectedTo, Sewer System Inspection>
+<Dam Management, connectedTo, Water Scarcity Mitigation>
+<Desalination, connectedTo, Water Scarcity Mitigation>
+<Desalination, filters, Hydroelectric Power Generation>
+<Drinking Water Standards Compliance, connectedTo, Transboundary Water Management>
+<Environmental Flow Assessment, connectedTo, Water Meter Reading>
+<Greywater Recycling, connectedTo, Drinking Water Standards Compliance>
+<Greywater Recycling, connectedTo, Transboundary Water Management>
+<Greywater Recycling, connectedTo, Water Rights Management>
+<Hydroelectric Power Generation, connectedTo, Water Scarcity Mitigation>
+<Hydrological Modeling, connectedTo, Drinking Water Standards Compliance>
+<Hydrological Modeling, connectedTo, Greywater Recycling>
+<Hydrological Modeling, connectedTo, Public Awareness Campaigns>
+<Hydrological Modeling, connectedTo, Reservoir Operation>
+<Hydrological Modeling, connectedTo, Transboundary Water Management>
+<Hydrological Modeling, connectedTo, Water Rights Management>
+<Industrial Water Use Optimization, connectedTo, Greywater Recycling>
+<Pollution Source Identification, connectedTo, Environmental Flow Assessment>
+<Public Awareness Campaigns, connectedTo, Billing and Revenue Management>
+<Reservoir Operation, connectedTo, Pollution Source Identification>
+<Sewer System Inspection, assesses, Wastewater Treatment>
+<Wastewater Treatment, connectedTo, Water Resource Planning>
+<Water Conservation Planning, connectedTo, Dam Management>
+<Water Meter Reading, connectedTo, Wastewater Treatment>
+<Water Quality Monitoring, connectedTo, Drinking Water Standards Compliance>
+<Water Quality Monitoring, reports, Hydrological Modeling>
+<Water Resource Planning, connectedTo, Drinking Water Standards Compliance>
+<Water Resource Planning, connectedTo, Water Quality Monitoring>
+<Water Rights Management, audits, Drinking Water Standards Compliance>
+<Water Scarcity Mitigation, connectedTo, Sewer System Inspection>
diff --git a/test/diagrams/graph_hard/diagrams_13.dot b/test/diagrams/graph_hard/diagrams_13.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d085ee0c43b705b87db938d700a7715f4b458aaf
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_13.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=TB
+	N0 [label="Subscription Service" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N1 [label="Refund Process" color="#94C0C0" fillcolor="#CADEDE" shape=action style=filled]
+	N2 [label="Shipment" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N3 [label="Customer Segmentation" color="#00BCD4" fillcolor="#B2EBF2" shape=rect style=filled]
+	N4 [label="Data Analytics Reporting" color="#94C0C0" fillcolor="#CADEDE" shape=vnode_shape style=filled]
+	N5 [label="Cross_selling Recommendation" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	N6 [label="Customer Review" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N7 [label="Delivery Rescheduling" color="#94C0C0" fillcolor="#CADEDE" shape=action style=filled]
+	N8 [label="Gift Card Purchase" color="#94C0C0" fillcolor="#CADEDE" shape=document style=filled]
+	N9 [label="Return Merchandise Authorization" color="#00BCD4" fillcolor="#B2EBF2" shape=predefinedprocess style=filled]
+	N10 [label="Price Adjustment" color="#94C0C0" fillcolor="#CADEDE" shape=preparation style=filled]
+	N11 [label="Order Confirmation" color="#94C0C0" fillcolor="#CADEDE" shape=rect style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#94C0C0" fillcolor="#CADEDE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#94C0C0" fillcolor="#CADEDE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Package Return {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Package Return"
+		nest0_0 [label="User Account Management" color="#00BCD4" fillcolor="#B2EBF2" shape=rect style=filled]
+		nest0_1 [label="Payment" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+		nest0_2 [label="Up_selling Offer" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest0_3 [label="Promotion Application" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	}
+	subgraph cluster_Add to Cart {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Add to Cart"
+		nest1_0 [label="Affiliate Marketing" color="#94C0C0" fillcolor="#CADEDE" shape=predefinedprocess style=filled]
+		nest1_1 [label="Supplier Onboarding" color="#94C0C0" fillcolor="#CADEDE" shape=predefinedprocess style=filled]
+		nest1_2 [label="Invoice Generation" color="#9FA9E1" fillcolor="#D6D9F0" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#00BCD4" penwidth=1.5 style=dashed label="returns" dir=forward]
+	N1 -> N2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid label="lists" dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest0_0 [color="#00BCD4" penwidth=1.5 style=solid label="manages" dir=forward]
+	nest0_3 -> N1 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#94C0C0" penwidth=1.5 style=dashed label="confirms" dir=forward]
+	nest1_2 -> N11 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#9FA9E1" penwidth=1.5 style=solid label="inquires" dir=forward]
+	N6 -> S2 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#9FA9E1" penwidth=1.5 style=dashed label="notifies" dir=forward]
+	S2 -> N10 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	M0 -> N9 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	M1 -> N3 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N8 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N11 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_130.txt b/test/diagrams/graph_hard/diagrams_130.txt
new file mode 100644
index 0000000000000000000000000000000000000000..05fb7b52c722b970f9cf29588f90de4b1c0d1a0b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_130.txt
@@ -0,0 +1,35 @@
+<Chemical Recycling, connectedTo, Sorting and Segregation>
+<Collection Point Management, connectedTo, Recycling Policy Advocacy>
+<Commercial Recycling Solutions, connectedTo, Construction Waste Recycling>
+<Composting Organic Waste, connectedTo, Collection Point Management>
+<Construction Waste Recycling, connectedTo, Mechanical Recycling>
+<Contamination Reduction, connectedTo, Recycling Market Development>
+<Contamination Reduction, enforces, Collection Point Management>
+<Deposit_Return Schemes, connectedTo, Material Purity Testing>
+<Electronic Waste Recycling, assesses, Public Recycling Programs>
+<Energy Recovery from Non_Recyclables, connectedTo, Electronic Waste Recycling>
+<Glass Recycling, connectedTo, Textile Recycling>
+<Life Cycle Assessment, connectedTo, Chemical Recycling>
+<Life Cycle Assessment, connectedTo, Glass Recycling>
+<Mechanical Recycling, connectedTo, Deposit_Return Schemes>
+<New Product Manufacturing, connectedTo, Collection Point Management>
+<New Product Manufacturing, connectedTo, Contamination Reduction>
+<New Product Manufacturing, connectedTo, Plastic Recycling>
+<Plastic Recycling, connectedTo, Waste Audit for Recycling>
+<Product Design for Recyclability, tracks, Energy Recovery from Non_Recyclables>
+<Public Recycling Programs, connectedTo, Material Purity Testing>
+<Recycling Facility Optimization, cleans, Commercial Recycling Solutions>
+<Recycling Infrastructure Development, connectedTo, Recycling Market Development>
+<Recycling Market Development, connectedTo, Collection Point Management>
+<Recycling Market Development, connectedTo, Tyre Recycling>
+<Recycling Policy Advocacy, connectedTo, Plastic Recycling>
+<Sorting and Segregation, connectedTo, Commercial Recycling Solutions>
+<Sorting and Segregation, connectedTo, Mechanical Recycling>
+<Sorting and Segregation, connectedTo, Recycling Facility Optimization>
+<Textile Recycling, connectedTo, Recycling Infrastructure Development>
+<Tyre Recycling, connectedTo, Composting Organic Waste>
+<Tyre Recycling, connectedTo, Construction Waste Recycling>
+<Tyre Recycling, connectedTo, Mechanical Recycling>
+<Tyre Recycling, connectedTo, Plastic Recycling>
+<Waste Audit for Recycling, connectedTo, Life Cycle Assessment>
+<Waste Audit for Recycling, connectedTo, Product Design for Recyclability>
diff --git a/test/diagrams/graph_hard/diagrams_131.dot b/test/diagrams/graph_hard/diagrams_131.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0a86a568630ab6771f8e7476c8b72d2e43e550a5
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_131.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=RL
+	N0 [label="Circular Economy Implementation" color="#C0CA33" fillcolor="#F9FBE7" shape=rectangle style=filled]
+	N1 [label="Material Purity Testing" color="#C0CA33" fillcolor="#F9FBE7" shape=diamond style=filled]
+	N2 [label="Industrial Recycling Programs" color="#82DAFF" fillcolor="#C8EDFF" shape=diamond style=filled]
+	N3 [label="Electronic Waste Recycling" color="#9C27B0" fillcolor="#E1BEE7" shape=inputoutput style=filled]
+	N4 [label="Waste Audit for Recycling" color="#9C27B0" fillcolor="#E1BEE7" shape=hexagon style=filled]
+	N5 [label="Glass Recycling" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N6 [label="Metal Recycling" color="#C0CA33" fillcolor="#F9FBE7" shape=diamond style=filled]
+	N7 [label="Hazardous Material Recovery" color="#82DAFF" fillcolor="#C8EDFF" shape=action style=filled]
+	N8 [label="Collection Point Management" color="#C0CA33" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	N9 [label="Recycling Facility Optimization" color="#9C27B0" fillcolor="#E1BEE7" shape=database style=filled]
+	N10 [label="Chemical Recycling" color="#C0CA33" fillcolor="#F9FBE7" shape=vnode_shape style=filled]
+	S0 [label="" color="#C0CA33" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#C0CA33" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_End_of_Life Product Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="End_of_Life Product Management"
+		nest0_0 [label="Advanced Sorting Technologies" color="#9C27B0" fillcolor="#E1BEE7" shape=diamond style=filled]
+		nest0_1 [label="Recycling Policy Advocacy" color="#C0CA33" fillcolor="#F9FBE7" shape=action style=filled]
+		nest0_2 [label="Composting Organic Waste" color="#9C27B0" fillcolor="#E1BEE7" shape=rectangle style=filled]
+	}
+	subgraph cluster_Sorting and Segregation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Sorting and Segregation"
+		nest1_0 [label="Waste Stream Analysis" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+		nest1_1 [label="Closed_Loop Material Flow" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+		nest1_2 [label="Construction Waste Recycling" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid label="sorts" dir=forward]
+	N2 -> N3 [color="#9C27B0" penwidth=1.5 style=dashed label="tests" dir=forward]
+	N3 -> N4 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N7 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N2 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	M2 -> N5 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N4 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_132.dot b/test/diagrams/graph_hard/diagrams_132.dot
new file mode 100644
index 0000000000000000000000000000000000000000..207481859d3f7b9e607b4c7ecba7c2671342d01a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_132.dot
@@ -0,0 +1,90 @@
+digraph {
+	rankdir=BT
+	N0 [label="Recycling Policy Advocacy" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N1 [label="Waste Stream Analysis" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N2 [label="Paper Recycling" color="#00BCD4" fillcolor="#E0F7FA" shape=rect style=filled]
+	N3 [label="Textile Recycling" color="#FFC107" fillcolor="#FFECB3" shape=rect style=filled]
+	N4 [label="Contamination Reduction" color="#FFC107" fillcolor="#FFECB3" shape=rectangle style=filled]
+	N5 [label="Recycling Infrastructure Development" color="#FFC107" fillcolor="#FFECB3" shape=preparation style=filled]
+	N6 [label="Collection Point Management" color="#FFC107" fillcolor="#FFECB3" shape=inputoutput style=filled]
+	N7 [label="Recycling Data Tracking" color="#FFC107" fillcolor="#FFECB3" shape=action style=filled]
+	N8 [label="Composting Organic Waste" color="#FFC107" fillcolor="#FFECB3" shape=rectangle style=filled]
+	N9 [label="Cleaning and Processing" color="#FFC107" fillcolor="#FFECB3" shape=rectangle style=filled]
+	N10 [label="Public Recycling Programs" color="#FFC107" fillcolor="#FFECB3" shape=preparation style=filled]
+	N11 [label="New Product Manufacturing" color="#FFC107" fillcolor="#FFECB3" shape=diamond style=filled]
+	N12 [label="Recycling Market Development" color="#FFC107" fillcolor="#FFECB3" shape=vnode_shape style=filled]
+	N13 [label="Closed_Loop Material Flow" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+	N14 [label="Waste Audit for Recycling" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N15 [label="Hazardous Material Recovery" color="#DCE775" fillcolor="#FCFCE7" shape=action style=filled]
+	N16 [label="Commercial Recycling Solutions" color="#00BCD4" fillcolor="#E0F7FA" shape=preparation style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFC107" fillcolor="#FFECB3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFC107" fillcolor="#FFECB3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Circular Economy Implementation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Circular Economy Implementation"
+		nest0_0 [label="Chemical Recycling" color="#00BCD4" fillcolor="#E0F7FA" shape=document style=filled]
+		nest0_1 [label="Tyre Recycling" color="#DCE775" fillcolor="#FCFCE7" shape=inputoutput style=filled]
+		nest0_2 [label="Battery Recycling" color="#DCE775" fillcolor="#FCFCE7" shape=database style=filled]
+	}
+	subgraph cluster_Industrial Recycling Programs {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Industrial Recycling Programs"
+		nest1_0 [label="Product Design for Recyclability" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+		nest1_1 [label="Recycling Facility Optimization" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+		nest1_2 [label="Advanced Sorting Technologies" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest1_3 [label="Metal Recycling" color="#DCE775" fillcolor="#FCFCE7" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N5 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S0 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N5 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#FFC107" penwidth=1.5 style=dashed label="melts" dir=forward]
+	S2 -> N7 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N16 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N7 -> M0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N9 -> M0 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N12 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#FFC107" penwidth=1.5 style=solid label="partners" dir=forward]
+	M0 -> N14 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_132.txt b/test/diagrams/graph_hard/diagrams_132.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bb8e5d6eca0f85da8623a301c90e6bfb02d4fd4f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_132.txt
@@ -0,0 +1,43 @@
+<Advanced Sorting Technologies, connectedTo, Metal Recycling>
+<Battery Recycling, connectedTo, Recycling Infrastructure Development>
+<Chemical Recycling, connectedTo, Tyre Recycling>
+<Cleaning and Processing, connectedTo, Public Recycling Programs>
+<Cleaning and Processing, connectedTo, Waste Audit for Recycling>
+<Closed_Loop Material Flow, connectedTo, Waste Audit for Recycling>
+<Collection Point Management, connectedTo, Recycling Data Tracking>
+<Composting Organic Waste, connectedTo, Cleaning and Processing>
+<Contamination Reduction, connectedTo, Collection Point Management>
+<Contamination Reduction, connectedTo, Hazardous Material Recovery>
+<Contamination Reduction, connectedTo, Recycling Data Tracking>
+<Contamination Reduction, connectedTo, Recycling Infrastructure Development>
+<Hazardous Material Recovery, connectedTo, Commercial Recycling Solutions>
+<Metal Recycling, connectedTo, Recycling Data Tracking>
+<New Product Manufacturing, connectedTo, Recycling Market Development>
+<Paper Recycling, connectedTo, Collection Point Management>
+<Paper Recycling, connectedTo, Textile Recycling>
+<Product Design for Recyclability, connectedTo, Recycling Facility Optimization>
+<Public Recycling Programs, connectedTo, New Product Manufacturing>
+<Recycling Data Tracking, connectedTo, Composting Organic Waste>
+<Recycling Data Tracking, connectedTo, Waste Audit for Recycling>
+<Recycling Facility Optimization, connectedTo, Advanced Sorting Technologies>
+<Recycling Infrastructure Development, connectedTo, Closed_Loop Material Flow>
+<Recycling Infrastructure Development, connectedTo, Collection Point Management>
+<Recycling Infrastructure Development, connectedTo, Commercial Recycling Solutions>
+<Recycling Infrastructure Development, connectedTo, Recycling Data Tracking>
+<Recycling Infrastructure Development, melts, Cleaning and Processing>
+<Recycling Infrastructure Development, partners, Waste Audit for Recycling>
+<Recycling Market Development, connectedTo, Closed_Loop Material Flow>
+<Recycling Market Development, connectedTo, Waste Audit for Recycling>
+<Recycling Policy Advocacy, connectedTo, Collection Point Management>
+<Recycling Policy Advocacy, connectedTo, Waste Stream Analysis>
+<Textile Recycling, connectedTo, Chemical Recycling>
+<Textile Recycling, connectedTo, Collection Point Management>
+<Textile Recycling, connectedTo, Contamination Reduction>
+<Textile Recycling, connectedTo, Product Design for Recyclability>
+<Tyre Recycling, connectedTo, Battery Recycling>
+<Waste Audit for Recycling, connectedTo, Hazardous Material Recovery>
+<Waste Stream Analysis, connectedTo, Closed_Loop Material Flow>
+<Waste Stream Analysis, connectedTo, Composting Organic Waste>
+<Waste Stream Analysis, connectedTo, Hazardous Material Recovery>
+<Waste Stream Analysis, connectedTo, Paper Recycling>
+<Waste Stream Analysis, connectedTo, Waste Audit for Recycling>
diff --git a/test/diagrams/graph_hard/diagrams_133.txt b/test/diagrams/graph_hard/diagrams_133.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5d5915b749da50a09d41bf8b4ea578741c8fa8dd
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_133.txt
@@ -0,0 +1,37 @@
+<Afforestation, connectedTo, Watershed Protection>
+<Agroforestry Systems, researches, Tree Nursery Management>
+<Biodiversity Conservation in Forests, cultivates, Agroforestry Systems>
+<Biodiversity Conservation in Forests, partOf, Biodiversity Conservation in Forests>
+<Biomass Production from Forests, connectedTo, Soil Conservation>
+<Climate Change Adaptation in Forests, connectedTo, Sawmill Processing>
+<Climate Change Adaptation in Forests, partOf, Climate Change Adaptation in Forests>
+<Drone Surveying for Forests, connectedTo, Biodiversity Conservation in Forests>
+<Drone Surveying for Forests, partOf, Drone Surveying for Forests>
+<Forest Certification, connectedTo, Urban Forestry Management>
+<Forest Health Monitoring, connectedTo, Afforestation>
+<Forest Health Monitoring, conserves, Forest Certification>
+<Forest Inventory, connectedTo, Forest Health Monitoring>
+<Forest Inventory, connectedTo, Forestry Education>
+<Forest Inventory, connectedTo, Tree Planting>
+<Forestry Education, connectedTo, Forest Health Monitoring>
+<Forestry Policy Development, connectedTo, Agroforestry Systems>
+<Logging Operations, connectedTo, Climate Change Adaptation in Forests>
+<Logging Operations, connectedTo, GIS Mapping for Forestry>
+<Public Access Management, connectedTo, Tree Nursery Management>
+<Sawmill Processing, connectedTo, Drone Surveying for Forests>
+<Sawmill Processing, partOf, Sawmill Processing>
+<Soil Conservation, transports, Forest Certification>
+<Sustainable Forest Management, connectedTo, Forest Certification>
+<Sustainable Forest Management, connectedTo, Forest Health Monitoring>
+<Sustainable Forest Management, connectedTo, Forest Inventory>
+<Tree Nursery Management, sells, Logging Operations>
+<Tree Planting, connectedTo, Public Access Management>
+<Urban Forestry Management, connectedTo, Wildlife Habitat Management>
+<Watershed Protection, connectedTo, Biomass Production from Forests>
+<Watershed Protection, connectedTo, Forest Certification>
+<Wildlife Habitat Management, connectedTo, Agroforestry Systems>
+<Wildlife Habitat Management, connectedTo, Forestry Policy Development>
+<Wildlife Habitat Management, connectedTo, GIS Mapping for Forestry>
+<Wildlife Habitat Management, connectedTo, Logging Operations>
+<Wildlife Habitat Management, connectedTo, Tree Nursery Management>
+<Wildlife Habitat Management, regulates, GIS Mapping for Forestry>
diff --git a/test/diagrams/graph_hard/diagrams_134.dot b/test/diagrams/graph_hard/diagrams_134.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e50ca3b2ccbf064b285324e34f9b22c2054bfb91
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_134.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=RL
+	N0 [label="Pest and Disease Control" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+	N1 [label="Agroforestry Systems" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+	N2 [label="Forest Certification" color="#92C79A" fillcolor="#E8F0EA" shape=predefinedprocess style=filled]
+	N3 [label="Reforestation" color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+	N4 [label="Forest Carbon Accounting" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N5 [label="Wildlife Habitat Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=preparation style=filled]
+	N6 [label="Silviculture" color="#92C79A" fillcolor="#E8F0EA" shape=multipledocuments style=filled]
+	N7 [label="Ecological Restoration" color="#388E3C" fillcolor="#F1F8E9" shape=rect style=filled]
+	N8 [label="Timber Harvesting" color="#F7BEE0" fillcolor="#FAEBF3" shape=parallelogram style=filled]
+	N9 [label="Forestry Equipment Maintenance" color="#F7BEE0" fillcolor="#FAEBF3" shape=preparation style=filled]
+	N10 [label="Forestry Education" color="#92C79A" fillcolor="#E8F0EA" shape=multipledocuments style=filled]
+	S0 [label="" color="#92C79A" fillcolor="#E8F0EA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#92C79A" fillcolor="#E8F0EA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Climate Change Adaptation in Forests {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Climate Change Adaptation in Forests"
+		nest0_0 [label="Indigenous Forestry Practices" color="#388E3C" fillcolor="#F1F8E9" shape=document style=filled]
+		nest0_1 [label="Biodiversity Conservation in Forests" color="#388E3C" fillcolor="#F1F8E9" shape=preparation style=filled]
+		nest0_2 [label="Recreation Management" color="#92C79A" fillcolor="#E8F0EA" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Non_Timber Forest Product Collection {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Non_Timber Forest Product Collection"
+		nest1_0 [label="Afforestation" color="#92C79A" fillcolor="#E8F0EA" shape=rect style=filled]
+		nest1_1 [label="Forest Fire Management" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+		nest1_2 [label="Forest Research" color="#92C79A" fillcolor="#E8F0EA" shape=action style=filled]
+		nest1_3 [label="Forest Inventory" color="#92C79A" fillcolor="#E8F0EA" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#388E3C" penwidth=1.5 style=solid label="certifies" dir=forward]
+	N5 -> N6 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#388E3C" penwidth=1.5 style=solid label="assesses" dir=forward]
+	N7 -> N8 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#92C79A" penwidth=1.5 style=dashed label="thins" dir=forward]
+	nest0_0 -> nest0_1 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest0_0 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N7 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#000000" penwidth=1.5 style=dashed label="surveys" dir=forward]
+	N2 -> S1 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N4 -> S2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N8 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_134.txt b/test/diagrams/graph_hard/diagrams_134.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1aeeae093425a647b7e0a30815850431f57844a0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_134.txt
@@ -0,0 +1,27 @@
+<Afforestation, connectedTo, Forest Fire Management>
+<Agroforestry Systems, connectedTo, Forest Carbon Accounting>
+<Agroforestry Systems, connectedTo, Forest Certification>
+<Agroforestry Systems, connectedTo, Timber Harvesting>
+<Agroforestry Systems, surveys, Forestry Equipment Maintenance>
+<Biodiversity Conservation in Forests, connectedTo, Recreation Management>
+<Ecological Restoration, connectedTo, Timber Harvesting>
+<Forest Carbon Accounting, certifies, Wildlife Habitat Management>
+<Forest Carbon Accounting, connectedTo, Forestry Education>
+<Forest Carbon Accounting, connectedTo, Silviculture>
+<Forest Carbon Accounting, connectedTo, Timber Harvesting>
+<Forest Certification, connectedTo, Forest Carbon Accounting>
+<Forest Certification, connectedTo, Forestry Equipment Maintenance>
+<Forest Certification, connectedTo, Reforestation>
+<Forest Fire Management, connectedTo, Forest Research>
+<Forest Inventory, connectedTo, Ecological Restoration>
+<Forest Research, connectedTo, Forest Inventory>
+<Forestry Equipment Maintenance, thins, Forestry Education>
+<Indigenous Forestry Practices, connectedTo, Biodiversity Conservation in Forests>
+<Pest and Disease Control, connectedTo, Agroforestry Systems>
+<Recreation Management, connectedTo, Reforestation>
+<Reforestation, connectedTo, Forest Carbon Accounting>
+<Reforestation, connectedTo, Indigenous Forestry Practices>
+<Silviculture, assesses, Ecological Restoration>
+<Timber Harvesting, connectedTo, Afforestation>
+<Timber Harvesting, connectedTo, Forestry Equipment Maintenance>
+<Wildlife Habitat Management, connectedTo, Silviculture>
diff --git a/test/diagrams/graph_hard/diagrams_135.dot b/test/diagrams/graph_hard/diagrams_135.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1a57396a5a171dcfd642a77a4395f48542c72c51
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_135.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=LR
+	N0 [label="Erosion Control" color="#FFE69C" fillcolor="#FFF9D4" shape=action style=filled]
+	N1 [label="Watershed Protection" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N2 [label="Logging Operations" color="#FFE69C" fillcolor="#FFF9D4" shape=preparation style=filled]
+	N3 [label="Drone Surveying for Forests" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N4 [label="Forest Fire Management" color="#FFF9AE" fillcolor="#FFFCE6" shape=preparation style=filled]
+	N5 [label="Reforestation" color="#C2B2F0" fillcolor="#EFE6FF" shape=inputoutput style=filled]
+	N6 [label="Ecological Restoration" color="#FFF9AE" fillcolor="#FFFCE6" shape=rect style=filled]
+	N7 [label="Climate Change Adaptation in Forests" color="#C2B2F0" fillcolor="#EFE6FF" shape=hexagon style=filled]
+	N8 [label="Forestry Equipment Maintenance" color="#FFE69C" fillcolor="#FFF9D4" shape=inputoutput style=filled]
+	N9 [label="Forest Inventory" color="#FFE69C" fillcolor="#FFF9D4" shape=rect style=filled]
+	S0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFE69C" fillcolor="#FFF9D4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Soil Conservation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Soil Conservation"
+		nest0_0 [label="Forest Research" color="#FFF9AE" fillcolor="#FFFCE6" shape=diamond style=filled]
+		nest0_1 [label="Biomass Production from Forests" color="#C2B2F0" fillcolor="#EFE6FF" shape=document style=filled]
+		nest0_2 [label="Indigenous Forestry Practices" color="#FFF9AE" fillcolor="#FFFCE6" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Wood Product Manufacturing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Wood Product Manufacturing"
+		nest1_0 [label="Afforestation" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+		nest1_1 [label="Recreation Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#C2B2F0" penwidth=1.5 style=solid label="reports" dir=forward]
+	N8 -> N9 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N9 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest1_0 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N9 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N0 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#FFE69C" penwidth=1.5 style=solid label="conserves" dir=forward]
+	S0 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N4 -> S2 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#FFF9AE" penwidth=1.5 style=solid label="manages" dir=forward]
+	S2 -> N6 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	M0 -> N7 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_135.txt b/test/diagrams/graph_hard/diagrams_135.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6fd4bee871e0e82619b62028c9d1666125c29099
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_135.txt
@@ -0,0 +1,27 @@
+<Afforestation, connectedTo, Recreation Management>
+<Biomass Production from Forests, connectedTo, Indigenous Forestry Practices>
+<Climate Change Adaptation in Forests, reports, Forestry Equipment Maintenance>
+<Drone Surveying for Forests, connectedTo, Afforestation>
+<Drone Surveying for Forests, connectedTo, Climate Change Adaptation in Forests>
+<Drone Surveying for Forests, connectedTo, Forest Fire Management>
+<Ecological Restoration, connectedTo, Climate Change Adaptation in Forests>
+<Erosion Control, connectedTo, Climate Change Adaptation in Forests>
+<Erosion Control, connectedTo, Drone Surveying for Forests>
+<Erosion Control, connectedTo, Forestry Equipment Maintenance>
+<Erosion Control, connectedTo, Watershed Protection>
+<Erosion Control, conserves, Forest Inventory>
+<Forest Fire Management, connectedTo, Climate Change Adaptation in Forests>
+<Forest Fire Management, connectedTo, Ecological Restoration>
+<Forest Fire Management, connectedTo, Forestry Equipment Maintenance>
+<Forest Fire Management, connectedTo, Reforestation>
+<Forest Fire Management, manages, Climate Change Adaptation in Forests>
+<Forest Research, connectedTo, Biomass Production from Forests>
+<Forestry Equipment Maintenance, connectedTo, Forest Inventory>
+<Indigenous Forestry Practices, connectedTo, Forest Inventory>
+<Logging Operations, connectedTo, Drone Surveying for Forests>
+<Logging Operations, connectedTo, Forest Inventory>
+<Logging Operations, connectedTo, Forestry Equipment Maintenance>
+<Recreation Management, connectedTo, Forest Inventory>
+<Reforestation, connectedTo, Ecological Restoration>
+<Reforestation, connectedTo, Forest Research>
+<Watershed Protection, connectedTo, Logging Operations>
diff --git a/test/diagrams/graph_hard/diagrams_136.dot b/test/diagrams/graph_hard/diagrams_136.dot
new file mode 100644
index 0000000000000000000000000000000000000000..55852af3421c148ec66180e0e859280ae188ece0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_136.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=BT
+	N0 [label="Parasite Control" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N1 [label="Euthanasia Services" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N2 [label="Diagnosis" color="#E91E63" fillcolor="#FCE4EC" shape=document style=filled]
+	N3 [label="Animal Sheltering Consultation" color="#795548" fillcolor="#D7CCC8" shape=multipledocuments style=filled]
+	N4 [label="Surgery" color="#795548" fillcolor="#D7CCC8" shape=vnode_shape style=filled]
+	N5 [label="Laboratory Testing" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N6 [label="Veterinary Pathology" color="#FF8A65" fillcolor="#FBE9E7" shape=rect style=filled]
+	N7 [label="Biosecurity Measures" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N8 [label="Herd Health Programs" color="#E91E63" fillcolor="#FCE4EC" shape=rect style=filled]
+	N9 [label="Medical Treatment" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N10 [label="Anesthesia Administration" color="#E91E63" fillcolor="#FCE4EC" shape=inputoutput style=filled]
+	N11 [label="Emergency Vet Services" color="#FF8A65" fillcolor="#FBE9E7" shape=database style=filled]
+	N12 [label="Client Communication" color="#E91E63" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+	N13 [label="Equine Care" color="#795548" fillcolor="#D7CCC8" shape=vnode_shape style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Allergy Testing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Allergy Testing"
+		nest0_0 [label="Behavioral Counseling" color="#795548" fillcolor="#D7CCC8" shape=inputoutput style=filled]
+		nest0_1 [label="Prescription" color="#E91E63" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+		nest0_2 [label="Nutritional Counseling" color="#795548" fillcolor="#D7CCC8" shape=database style=filled]
+	}
+	subgraph cluster_Hospice Care for Animals {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Hospice Care for Animals"
+		nest1_0 [label="Livestock Disease Prevention" color="#FF8A65" fillcolor="#FBE9E7" shape=document style=filled]
+		nest1_1 [label="Pharmacy Management" color="#E91E63" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#FF8A65" penwidth=1.5 style=dashed label="discharges" dir=forward]
+	N1 -> N2 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#795548" penwidth=1.5 style=dashed label="performs" dir=forward]
+	N7 -> N8 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest0_0 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N3 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N9 -> S0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N12 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_136.txt b/test/diagrams/graph_hard/diagrams_136.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ea880df62caf325a91da57a7f50a32b042c4aeaa
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_136.txt
@@ -0,0 +1,29 @@
+<Anesthesia Administration, connectedTo, Client Communication>
+<Anesthesia Administration, connectedTo, Emergency Vet Services>
+<Anesthesia Administration, connectedTo, Equine Care>
+<Animal Sheltering Consultation, connectedTo, Client Communication>
+<Animal Sheltering Consultation, connectedTo, Surgery>
+<Behavioral Counseling, connectedTo, Prescription>
+<Biosecurity Measures, connectedTo, Herd Health Programs>
+<Client Communication, connectedTo, Equine Care>
+<Diagnosis, connectedTo, Animal Sheltering Consultation>
+<Diagnosis, connectedTo, Client Communication>
+<Emergency Vet Services, connectedTo, Client Communication>
+<Euthanasia Services, connectedTo, Behavioral Counseling>
+<Euthanasia Services, connectedTo, Client Communication>
+<Euthanasia Services, connectedTo, Diagnosis>
+<Euthanasia Services, connectedTo, Livestock Disease Prevention>
+<Herd Health Programs, connectedTo, Medical Treatment>
+<Laboratory Testing, connectedTo, Veterinary Pathology>
+<Livestock Disease Prevention, connectedTo, Pharmacy Management>
+<Medical Treatment, connectedTo, Anesthesia Administration>
+<Medical Treatment, connectedTo, Client Communication>
+<Medical Treatment, connectedTo, Emergency Vet Services>
+<Medical Treatment, connectedTo, Equine Care>
+<Nutritional Counseling, connectedTo, Euthanasia Services>
+<Parasite Control, discharges, Euthanasia Services>
+<Pharmacy Management, connectedTo, Animal Sheltering Consultation>
+<Prescription, connectedTo, Nutritional Counseling>
+<Surgery, connectedTo, Client Communication>
+<Surgery, connectedTo, Laboratory Testing>
+<Veterinary Pathology, performs, Biosecurity Measures>
diff --git a/test/diagrams/graph_hard/diagrams_137.dot b/test/diagrams/graph_hard/diagrams_137.dot
new file mode 100644
index 0000000000000000000000000000000000000000..09c57c8e5a81b9a2875b9606f147aafe250e04ee
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_137.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=BT
+	N0 [label="Animal Sheltering Consultation" color="#607D8B" fillcolor="#CFD8DC" shape=rectangle style=filled]
+	N1 [label="Behavioral Counseling" color="#5C6BC0" fillcolor="#E8EAF6" shape=diamond style=filled]
+	N2 [label="Genetic Counseling for Animals" color="#5C6BC0" fillcolor="#E8EAF6" shape=inputoutput style=filled]
+	N3 [label="Biosecurity Measures" color="#607D8B" fillcolor="#CFD8DC" shape=diamond style=filled]
+	N4 [label="Medical Treatment" color="#5C6BC0" fillcolor="#E8EAF6" shape=rectangle style=filled]
+	N5 [label="Imaging Services" color="#5C6BC0" fillcolor="#E8EAF6" shape=predefinedprocess style=filled]
+	N6 [label="Livestock Disease Prevention" color="#5C6BC0" fillcolor="#E8EAF6" shape=action style=filled]
+	N7 [label="Vaccination" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N8 [label="Pre_surgical Assessment" color="#FFDA4E" fillcolor="#FFE88D" shape=diamond style=filled]
+	N9 [label="Veterinary Technology Training" color="#607D8B" fillcolor="#CFD8DC" shape=inputoutput style=filled]
+	N10 [label="Diagnosis" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N11 [label="Nutritional Counseling" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	S0 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Farm Animal Health Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Farm Animal Health Management"
+		nest0_0 [label="Client Communication" color="#FFDA4E" fillcolor="#FFE88D" shape=rectangle style=filled]
+		nest0_1 [label="Spay or Neuter Procedure" color="#607D8B" fillcolor="#CFD8DC" shape=inputoutput style=filled]
+		nest0_2 [label="Public Health Vet Services" color="#607D8B" fillcolor="#CFD8DC" shape=rectangle style=filled]
+	}
+	subgraph cluster_Post_operative Care {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Post_operative Care"
+		nest1_0 [label="Parasite Control" color="#607D8B" fillcolor="#CFD8DC" shape=diamond style=filled]
+		nest1_1 [label="Emergency Vet Services" color="#607D8B" fillcolor="#CFD8DC" shape=document style=filled]
+		nest1_2 [label="Allergy Testing" color="#FFDA4E" fillcolor="#FFE88D" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#5C6BC0" penwidth=1.5 style=dashed label="vaccinates" dir=forward]
+	N7 -> N8 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest0_0 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N9 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N1 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S0 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N2 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N4 -> S1 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N11 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N1 -> N5 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_137.txt b/test/diagrams/graph_hard/diagrams_137.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4112c23186e92920b5519e3c51b7006d52c8e19e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_137.txt
@@ -0,0 +1,26 @@
+<Allergy Testing, connectedTo, Behavioral Counseling>
+<Animal Sheltering Consultation, connectedTo, Behavioral Counseling>
+<Animal Sheltering Consultation, connectedTo, Diagnosis>
+<Animal Sheltering Consultation, connectedTo, Genetic Counseling for Animals>
+<Animal Sheltering Consultation, connectedTo, Livestock Disease Prevention>
+<Behavioral Counseling, connectedTo, Genetic Counseling for Animals>
+<Behavioral Counseling, connectedTo, Imaging Services>
+<Behavioral Counseling, connectedTo, Parasite Control>
+<Biosecurity Measures, connectedTo, Medical Treatment>
+<Client Communication, connectedTo, Spay or Neuter Procedure>
+<Diagnosis, connectedTo, Nutritional Counseling>
+<Emergency Vet Services, connectedTo, Allergy Testing>
+<Genetic Counseling for Animals, connectedTo, Biosecurity Measures>
+<Imaging Services, connectedTo, Livestock Disease Prevention>
+<Livestock Disease Prevention, connectedTo, Client Communication>
+<Livestock Disease Prevention, connectedTo, Nutritional Counseling>
+<Livestock Disease Prevention, vaccinates, Vaccination>
+<Medical Treatment, connectedTo, Imaging Services>
+<Medical Treatment, connectedTo, Nutritional Counseling>
+<Medical Treatment, connectedTo, Pre_surgical Assessment>
+<Parasite Control, connectedTo, Emergency Vet Services>
+<Pre_surgical Assessment, connectedTo, Veterinary Technology Training>
+<Public Health Vet Services, connectedTo, Veterinary Technology Training>
+<Spay or Neuter Procedure, connectedTo, Public Health Vet Services>
+<Vaccination, connectedTo, Pre_surgical Assessment>
+<Veterinary Technology Training, connectedTo, Diagnosis>
diff --git a/test/diagrams/graph_hard/diagrams_138.dot b/test/diagrams/graph_hard/diagrams_138.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e26827011ad194e702fdf1889e7c76511b26a9ff
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_138.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=TB
+	N0 [label="Post_operative Care" color="#DCE775" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	N1 [label="Emergency Vet Services" color="#E91E63" fillcolor="#FCE4EC" shape=preparation style=filled]
+	N2 [label="Laboratory Testing" color="#DCE775" fillcolor="#F9FBE7" shape=rectangle style=filled]
+	N3 [label="Microchipping" color="#FFB2A5" fillcolor="#FFDCD6" shape=action style=filled]
+	N4 [label="Toxicology Testing" color="#DCE775" fillcolor="#F9FBE7" shape=action style=filled]
+	N5 [label="Wildlife Rehabilitation" color="#E91E63" fillcolor="#FCE4EC" shape=action style=filled]
+	N6 [label="Anesthesia Administration" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N7 [label="Medical Record Keeping" color="#DCE775" fillcolor="#F9FBE7" shape=database style=filled]
+	N8 [label="Diagnosis" color="#FFB2A5" fillcolor="#FFDCD6" shape=vnode_shape style=filled]
+	N9 [label="Genetic Counseling for Animals" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N10 [label="Farm Animal Health Management" color="#DCE775" fillcolor="#F9FBE7" shape=predefinedprocess style=filled]
+	N11 [label="Parasite Control" color="#E91E63" fillcolor="#FCE4EC" shape=action style=filled]
+	N12 [label="Pharmacy Management" color="#DCE775" fillcolor="#F9FBE7" shape=inputoutput style=filled]
+	N13 [label="Herd Health Programs" color="#FFB2A5" fillcolor="#FFDCD6" shape=preparation style=filled]
+	N14 [label="Equine Care" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N15 [label="Pet Check_up" color="#DCE775" fillcolor="#F9FBE7" shape=preparation style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFB2A5" fillcolor="#FFDCD6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Behavioral Counseling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Behavioral Counseling"
+		nest0_0 [label="Vaccination" color="#FFB2A5" fillcolor="#FFDCD6" shape=parallelogram style=filled]
+		nest0_1 [label="Veterinary Technology Training" color="#FFB2A5" fillcolor="#FFDCD6" shape=preparation style=filled]
+		nest0_2 [label="Animal Sheltering Consultation" color="#DCE775" fillcolor="#F9FBE7" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Reproductive Services {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Reproductive Services"
+		nest1_0 [label="Dental Care" color="#E91E63" fillcolor="#FCE4EC" shape=document style=filled]
+		nest1_1 [label="Medical Treatment" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N13 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N7 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N12 -> S0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#E91E63" penwidth=1.5 style=solid label="documents" dir=forward]
+	S0 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> S1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N7 -> S2 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S2 -> N15 [color="#000000" penwidth=1.5 style=solid label="reproduces" dir=forward]
+	N6 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> M0 [color="#FFB2A5" penwidth=1.5 style=dashed label="bills" dir=forward]
+	M0 -> N15 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_138.txt b/test/diagrams/graph_hard/diagrams_138.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d876fa497e7ef11f800734a6aa9fd26e8a488c36
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_138.txt
@@ -0,0 +1,31 @@
+<Anesthesia Administration, connectedTo, Medical Record Keeping>
+<Anesthesia Administration, connectedTo, Pet Check_up>
+<Anesthesia Administration, connectedTo, Vaccination>
+<Animal Sheltering Consultation, connectedTo, Herd Health Programs>
+<Dental Care, connectedTo, Medical Treatment>
+<Diagnosis, connectedTo, Equine Care>
+<Diagnosis, connectedTo, Genetic Counseling for Animals>
+<Diagnosis, connectedTo, Parasite Control>
+<Emergency Vet Services, connectedTo, Laboratory Testing>
+<Equine Care, connectedTo, Pet Check_up>
+<Farm Animal Health Management, connectedTo, Parasite Control>
+<Genetic Counseling for Animals, connectedTo, Farm Animal Health Management>
+<Herd Health Programs, connectedTo, Equine Care>
+<Laboratory Testing, connectedTo, Microchipping>
+<Medical Record Keeping, connectedTo, Diagnosis>
+<Medical Record Keeping, connectedTo, Farm Animal Health Management>
+<Medical Record Keeping, connectedTo, Genetic Counseling for Animals>
+<Medical Record Keeping, reproduces, Pet Check_up>
+<Medical Treatment, connectedTo, Medical Record Keeping>
+<Microchipping, connectedTo, Toxicology Testing>
+<Parasite Control, bills, Pet Check_up>
+<Parasite Control, connectedTo, Pharmacy Management>
+<Pharmacy Management, connectedTo, Equine Care>
+<Pharmacy Management, connectedTo, Herd Health Programs>
+<Pharmacy Management, documents, Pet Check_up>
+<Post_operative Care, connectedTo, Emergency Vet Services>
+<Toxicology Testing, connectedTo, Dental Care>
+<Toxicology Testing, connectedTo, Wildlife Rehabilitation>
+<Vaccination, connectedTo, Veterinary Technology Training>
+<Veterinary Technology Training, connectedTo, Animal Sheltering Consultation>
+<Wildlife Rehabilitation, connectedTo, Anesthesia Administration>
diff --git a/test/diagrams/graph_hard/diagrams_139.dot b/test/diagrams/graph_hard/diagrams_139.dot
new file mode 100644
index 0000000000000000000000000000000000000000..647525847511e8d81d38eb35854ec4d56889be4b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_139.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=TB
+	N0 [label="Safety Supervision" color="#FFE470" fillcolor="#FFFAE0" shape=vnode_shape style=filled]
+	N1 [label="Learning Material Selection" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N2 [label="Emergency Evacuation Drills" color="#FFE470" fillcolor="#FFFAE0" shape=rect style=filled]
+	N3 [label="Curriculum Planning" color="#FFC2C2" fillcolor="#FFEBEB" shape=rect style=filled]
+	N4 [label="Sensory Play" color="#FFC2C2" fillcolor="#FFEBEB" shape=parallelogram style=filled]
+	N5 [label="Child Protection Policies" color="#FFE470" fillcolor="#FFFAE0" shape=document style=filled]
+	N6 [label="Nutritional Meal Preparation" color="#FFE470" fillcolor="#FFFAE0" shape=document style=filled]
+	N7 [label="Childcare Facility Licensing" color="#FFE470" fillcolor="#FFFAE0" shape=inputoutput style=filled]
+	N8 [label="Emotional Support" color="#FFC2C2" fillcolor="#FFEBEB" shape=inputoutput style=filled]
+	N9 [label="Daily Activity Reporting" color="#FFC2C2" fillcolor="#FFEBEB" shape=document style=filled]
+	N10 [label="Field Trip Organization" color="#FFE470" fillcolor="#FFFAE0" shape=preparation style=filled]
+	N11 [label="Diaper Changing" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N12 [label="Outdoor Exploration" color="#81C784" fillcolor="#F1F8E9" shape=preparation style=filled]
+	N13 [label="Outdoor Play Supervision" color="#81C784" fillcolor="#F1F8E9" shape=vnode_shape style=filled]
+	N14 [label="Hygiene Practices" color="#81C784" fillcolor="#F1F8E9" shape=document style=filled]
+	N15 [label="Individualized Attention" color="#FFE470" fillcolor="#FFFAE0" shape=action style=filled]
+	S0 [label="" color="#FFC2C2" fillcolor="#FFEBEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#81C784" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#81C784" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#81C784" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Infant Care {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Infant Care"
+		nest0_0 [label="Early Literacy Programs" color="#81C784" fillcolor="#F1F8E9" shape=rectangle style=filled]
+		nest0_1 [label="Story Time Reading" color="#FFC2C2" fillcolor="#FFEBEB" shape=vnode_shape style=filled]
+		nest0_2 [label="Child Psychology Application" color="#FFC2C2" fillcolor="#FFEBEB" shape=rect style=filled]
+		nest0_3 [label="Enrollment and Admissions" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	}
+	subgraph cluster_Behavior Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Behavior Management"
+		nest1_0 [label="Playground Safety Inspection" color="#FFE470" fillcolor="#FFFAE0" shape=predefinedprocess style=filled]
+		nest1_1 [label="Music and Movement Activities" color="#81C784" fillcolor="#F1F8E9" shape=action style=filled]
+		nest1_2 [label="Parent Communication" color="#FFC2C2" fillcolor="#FFEBEB" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#FFE470" penwidth=1.5 style=solid label="advises" dir=forward]
+	nest0_0 -> nest0_1 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest0_0 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> nest1_0 [color="#FFC2C2" penwidth=1.5 style=solid label="supervises" dir=forward]
+	nest1_2 -> N5 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N6 -> S1 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=dashed label="reports" dir=forward]
+	N0 -> M0 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N3 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_139.txt b/test/diagrams/graph_hard/diagrams_139.txt
new file mode 100644
index 0000000000000000000000000000000000000000..474cae370fdf70afe739955248c0b8945ce6ee48
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_139.txt
@@ -0,0 +1,34 @@
+<Child Protection Policies, connectedTo, Nutritional Meal Preparation>
+<Child Psychology Application, connectedTo, Enrollment and Admissions>
+<Childcare Facility Licensing, connectedTo, Emotional Support>
+<Curriculum Planning, connectedTo, Emotional Support>
+<Curriculum Planning, connectedTo, Field Trip Organization>
+<Curriculum Planning, connectedTo, Nutritional Meal Preparation>
+<Curriculum Planning, connectedTo, Sensory Play>
+<Daily Activity Reporting, connectedTo, Field Trip Organization>
+<Diaper Changing, connectedTo, Outdoor Exploration>
+<Diaper Changing, supervises, Playground Safety Inspection>
+<Early Literacy Programs, connectedTo, Story Time Reading>
+<Emergency Evacuation Drills, connectedTo, Curriculum Planning>
+<Emergency Evacuation Drills, connectedTo, Nutritional Meal Preparation>
+<Emotional Support, connectedTo, Daily Activity Reporting>
+<Enrollment and Admissions, connectedTo, Learning Material Selection>
+<Field Trip Organization, connectedTo, Diaper Changing>
+<Hygiene Practices, advises, Individualized Attention>
+<Learning Material Selection, connectedTo, Curriculum Planning>
+<Learning Material Selection, connectedTo, Emergency Evacuation Drills>
+<Music and Movement Activities, connectedTo, Parent Communication>
+<Nutritional Meal Preparation, connectedTo, Childcare Facility Licensing>
+<Nutritional Meal Preparation, connectedTo, Early Literacy Programs>
+<Nutritional Meal Preparation, connectedTo, Outdoor Exploration>
+<Nutritional Meal Preparation, connectedTo, Outdoor Play Supervision>
+<Nutritional Meal Preparation, reports, Diaper Changing>
+<Outdoor Exploration, connectedTo, Outdoor Play Supervision>
+<Outdoor Play Supervision, connectedTo, Hygiene Practices>
+<Parent Communication, connectedTo, Child Protection Policies>
+<Playground Safety Inspection, connectedTo, Music and Movement Activities>
+<Safety Supervision, connectedTo, Curriculum Planning>
+<Safety Supervision, connectedTo, Learning Material Selection>
+<Safety Supervision, connectedTo, Nutritional Meal Preparation>
+<Sensory Play, connectedTo, Child Protection Policies>
+<Story Time Reading, connectedTo, Child Psychology Application>
diff --git a/test/diagrams/graph_hard/diagrams_14.dot b/test/diagrams/graph_hard/diagrams_14.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a0fdb51e279b1c431d2d78077b834e89ebf6e753
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_14.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=LR
+	N0 [label="Cross_selling Recommendation" color="#42A5F5" fillcolor="#F1F8FF" shape=inputoutput style=filled]
+	N1 [label="Promotion Application" color="#42A5F5" fillcolor="#F1F8FF" shape=database style=filled]
+	N2 [label="Customer Segmentation" color="#42A5F5" fillcolor="#F1F8FF" shape=multipledocuments style=filled]
+	N3 [label="Delivery Tracking" color="#AF56A6" fillcolor="#DDCEDD" shape=inputoutput style=filled]
+	N4 [label="Cart Abandonment" color="#80DDEA" fillcolor="#D3F7F9" shape=database style=filled]
+	N5 [label="Marketing Campaign Launch" color="#42A5F5" fillcolor="#F1F8FF" shape=inputoutput style=filled]
+	N6 [label="Subscription Service" color="#AF56A6" fillcolor="#DDCEDD" shape=database style=filled]
+	N7 [label="User Account Management" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N8 [label="Stock Replenishment" color="#AF56A6" fillcolor="#DDCEDD" shape=rectangle style=filled]
+	N9 [label="Inventory Update" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N10 [label="Loyalty Points" color="#80DDEA" fillcolor="#D3F7F9" shape=multipledocuments style=filled]
+	N11 [label="Up_selling Offer" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+	N12 [label="Data Analytics Reporting" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N13 [label="Product Listing" color="#AF56A6" fillcolor="#DDCEDD" shape=multipledocuments style=filled]
+	N14 [label="Customer Inquiry" color="#80DDEA" fillcolor="#D3F7F9" shape=inputoutput style=filled]
+	S0 [label="" color="#42A5F5" fillcolor="#F1F8FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#42A5F5" fillcolor="#F1F8FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Delivery Rescheduling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Delivery Rescheduling"
+		nest0_0 [label="Wishlist Management" color="#80DDEA" fillcolor="#D3F7F9" shape=action style=filled]
+		nest0_1 [label="Affiliate Marketing" color="#42A5F5" fillcolor="#F1F8FF" shape=predefinedprocess style=filled]
+		nest0_2 [label="A or B Testing" color="#AF56A6" fillcolor="#DDCEDD" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Social Media Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Social Media Integration"
+		nest1_0 [label="Return Merchandise Authorization" color="#42A5F5" fillcolor="#F1F8FF" shape=rect style=filled]
+		nest1_1 [label="Refund Process" color="#42A5F5" fillcolor="#F1F8FF" shape=rectangle style=filled]
+		nest1_2 [label="Fraud Detection" color="#80DDEA" fillcolor="#D3F7F9" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#AF56A6" penwidth=1.5 style=solid label="delivers" dir=forward]
+	N7 -> N8 [color="#42A5F5" penwidth=1.5 style=solid label="personalizes" dir=forward]
+	N8 -> N9 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N10 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N1 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N9 -> S0 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#42A5F5" penwidth=1.5 style=solid label="searches" dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S1 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#80DDEA" penwidth=1.5 style=solid label="updates" dir=forward]
+	N11 -> S2 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	S2 -> N13 [color="#42A5F5" penwidth=1.5 style=solid label="applies" dir=forward]
+	S2 -> N14 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M1 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N8 -> M1 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	M1 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_14.txt b/test/diagrams/graph_hard/diagrams_14.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a6188360015a5b33188b8310254e01d261d6cc5f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_14.txt
@@ -0,0 +1,32 @@
+<A or B Testing, connectedTo, Loyalty Points>
+<Affiliate Marketing, connectedTo, A or B Testing>
+<Cart Abandonment, connectedTo, Marketing Campaign Launch>
+<Cross_selling Recommendation, connectedTo, Data Analytics Reporting>
+<Cross_selling Recommendation, connectedTo, Promotion Application>
+<Cross_selling Recommendation, connectedTo, Up_selling Offer>
+<Cross_selling Recommendation, updates, Loyalty Points>
+<Customer Segmentation, connectedTo, Delivery Tracking>
+<Customer Segmentation, connectedTo, Product Listing>
+<Customer Segmentation, connectedTo, Return Merchandise Authorization>
+<Data Analytics Reporting, connectedTo, Product Listing>
+<Delivery Tracking, connectedTo, Cart Abandonment>
+<Fraud Detection, connectedTo, Promotion Application>
+<Inventory Update, connectedTo, Data Analytics Reporting>
+<Inventory Update, connectedTo, Loyalty Points>
+<Inventory Update, connectedTo, Product Listing>
+<Inventory Update, searches, Up_selling Offer>
+<Loyalty Points, connectedTo, Up_selling Offer>
+<Marketing Campaign Launch, connectedTo, Subscription Service>
+<Product Listing, connectedTo, Customer Inquiry>
+<Promotion Application, connectedTo, Customer Segmentation>
+<Refund Process, connectedTo, Fraud Detection>
+<Return Merchandise Authorization, connectedTo, Refund Process>
+<Stock Replenishment, connectedTo, Inventory Update>
+<Stock Replenishment, connectedTo, Product Listing>
+<Subscription Service, delivers, User Account Management>
+<Up_selling Offer, applies, Product Listing>
+<Up_selling Offer, connectedTo, Customer Inquiry>
+<Up_selling Offer, connectedTo, Data Analytics Reporting>
+<User Account Management, connectedTo, Wishlist Management>
+<User Account Management, personalizes, Stock Replenishment>
+<Wishlist Management, connectedTo, Affiliate Marketing>
diff --git a/test/diagrams/graph_hard/diagrams_140.dot b/test/diagrams/graph_hard/diagrams_140.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4a1b62aab4d173f6ea9e775bec53dceb8fc8001e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_140.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=BT
+	N0 [label="Diaper Changing" color="#82DAFF" fillcolor="#C8EDFF" shape=rectangle style=filled]
+	N1 [label="Parent_Teacher Conferences" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N2 [label="Childcare Facility Licensing" color="#AED581" fillcolor="#F0F4C3" shape=action style=filled]
+	N3 [label="Individualized Attention" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N4 [label="Curriculum Planning" color="#E57373" fillcolor="#FFEBEE" shape=document style=filled]
+	N5 [label="Group Activities Coordination" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N6 [label="Nap Time Supervision" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N7 [label="Creative Arts Activities" color="#82DAFF" fillcolor="#C8EDFF" shape=vnode_shape style=filled]
+	N8 [label="Special Needs Accommodation" color="#82DAFF" fillcolor="#C8EDFF" shape=database style=filled]
+	N9 [label="Social Skill Development" color="#82DAFF" fillcolor="#C8EDFF" shape=database style=filled]
+	N10 [label="Enrollment and Admissions" color="#AED581" fillcolor="#F0F4C3" shape=document style=filled]
+	N11 [label="Emergency Evacuation Drills" color="#82DAFF" fillcolor="#C8EDFF" shape=rect style=filled]
+	N12 [label="Field Trip Organization" color="#AED581" fillcolor="#F0F4C3" shape=document style=filled]
+	S0 [label="" color="#82DAFF" fillcolor="#C8EDFF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Teacher_Child Ratio Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Teacher_Child Ratio Management"
+		nest0_0 [label="Toddler Activities" color="#AED581" fillcolor="#F0F4C3" shape=multipledocuments style=filled]
+		nest0_1 [label="Playground Safety Inspection" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+		nest0_2 [label="Hygiene Practices" color="#AED581" fillcolor="#F0F4C3" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Emotional Support {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Emotional Support"
+		nest1_0 [label="Potty Training Assistance" color="#E57373" fillcolor="#FFEBEE" shape=parallelogram style=filled]
+		nest1_1 [label="Outdoor Play Supervision" color="#E57373" fillcolor="#FFEBEE" shape=predefinedprocess style=filled]
+		nest1_2 [label="Parent Communication" color="#82DAFF" fillcolor="#C8EDFF" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest0_0 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N3 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N11 -> nest1_0 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N12 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N6 -> S0 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N4 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_140.txt b/test/diagrams/graph_hard/diagrams_140.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b57f50ac33e299dd8fe60f58446193fb59088870
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_140.txt
@@ -0,0 +1,29 @@
+<Childcare Facility Licensing, connectedTo, Curriculum Planning>
+<Childcare Facility Licensing, connectedTo, Individualized Attention>
+<Creative Arts Activities, connectedTo, Special Needs Accommodation>
+<Curriculum Planning, connectedTo, Group Activities Coordination>
+<Diaper Changing, connectedTo, Curriculum Planning>
+<Diaper Changing, connectedTo, Parent_Teacher Conferences>
+<Emergency Evacuation Drills, connectedTo, Field Trip Organization>
+<Emergency Evacuation Drills, connectedTo, Potty Training Assistance>
+<Enrollment and Admissions, connectedTo, Emergency Evacuation Drills>
+<Group Activities Coordination, connectedTo, Nap Time Supervision>
+<Hygiene Practices, connectedTo, Individualized Attention>
+<Individualized Attention, connectedTo, Curriculum Planning>
+<Individualized Attention, connectedTo, Toddler Activities>
+<Nap Time Supervision, connectedTo, Creative Arts Activities>
+<Nap Time Supervision, connectedTo, Emergency Evacuation Drills>
+<Nap Time Supervision, connectedTo, Enrollment and Admissions>
+<Nap Time Supervision, connectedTo, Field Trip Organization>
+<Nap Time Supervision, connectedTo, Special Needs Accommodation>
+<Outdoor Play Supervision, connectedTo, Parent Communication>
+<Parent Communication, connectedTo, Field Trip Organization>
+<Parent_Teacher Conferences, connectedTo, Childcare Facility Licensing>
+<Parent_Teacher Conferences, connectedTo, Curriculum Planning>
+<Playground Safety Inspection, connectedTo, Hygiene Practices>
+<Potty Training Assistance, connectedTo, Outdoor Play Supervision>
+<Social Skill Development, connectedTo, Enrollment and Admissions>
+<Special Needs Accommodation, connectedTo, Emergency Evacuation Drills>
+<Special Needs Accommodation, connectedTo, Enrollment and Admissions>
+<Special Needs Accommodation, connectedTo, Social Skill Development>
+<Toddler Activities, connectedTo, Playground Safety Inspection>
diff --git a/test/diagrams/graph_hard/diagrams_141.dot b/test/diagrams/graph_hard/diagrams_141.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ce213fd8ad3096511c654c64ec4b8492dbb6540f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_141.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=TB
+	N0 [label="Music and Movement Activities" color="#BDBDBD" fillcolor="#F5F5F5" shape=diamond style=filled]
+	N1 [label="Parent Communication" color="#BDBDBD" fillcolor="#F5F5F5" shape=diamond style=filled]
+	N2 [label="Staff Training and Certification" color="#AABEC6" fillcolor="#E0E6E9" shape=multipledocuments style=filled]
+	N3 [label="Daily Activity Reporting" color="#E91E63" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+	N4 [label="Toddler Activities" color="#AABEC6" fillcolor="#E0E6E9" shape=parallelogram style=filled]
+	N5 [label="Nutritional Meal Preparation" color="#E91E63" fillcolor="#FCE4EC" shape=vnode_shape style=filled]
+	N6 [label="Outdoor Play Supervision" color="#E91E63" fillcolor="#FCE4EC" shape=inputoutput style=filled]
+	N7 [label="Motor Skill Development" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N8 [label="Diaper Changing" color="#BDBDBD" fillcolor="#F5F5F5" shape=action style=filled]
+	N9 [label="Emergency Evacuation Drills" color="#BDBDBD" fillcolor="#F5F5F5" shape=rect style=filled]
+	N10 [label="Enrollment and Admissions" color="#BDBDBD" fillcolor="#F5F5F5" shape=multipledocuments style=filled]
+	N11 [label="Safety Supervision" color="#E91E63" fillcolor="#FCE4EC" shape=document style=filled]
+	N12 [label="Child Protection Policies" color="#AABEC6" fillcolor="#E0E6E9" shape=inputoutput style=filled]
+	N13 [label="Individualized Attention" color="#AABEC6" fillcolor="#E0E6E9" shape=preparation style=filled]
+	N14 [label="Learning Material Selection" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N15 [label="Teacher_Child Ratio Management" color="#AABEC6" fillcolor="#E0E6E9" shape=rectangle style=filled]
+	N16 [label="Preschool Education" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	S1 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#BDBDBD" fillcolor="#F5F5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Childcare Facility Licensing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Childcare Facility Licensing"
+		nest0_0 [label="Potty Training Assistance" color="#E91E63" fillcolor="#FCE4EC" shape=rectangle style=filled]
+		nest0_1 [label="Creative Arts Activities" color="#AABEC6" fillcolor="#E0E6E9" shape=rect style=filled]
+		nest0_2 [label="Story Time Reading" color="#AABEC6" fillcolor="#E0E6E9" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Sensory Play {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Sensory Play"
+		nest1_0 [label="Child Psychology Application" color="#E91E63" fillcolor="#FCE4EC" shape=rectangle style=filled]
+		nest1_1 [label="Curriculum Planning" color="#E91E63" fillcolor="#FCE4EC" shape=action style=filled]
+		nest1_2 [label="Playground Safety Inspection" color="#AABEC6" fillcolor="#E0E6E9" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#E91E63" penwidth=1.5 style=solid label="observes" dir=forward]
+	N10 -> nest0_0 [color="#BDBDBD" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N11 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#E91E63" penwidth=1.5 style=solid label="reports" dir=forward]
+	S1 -> N11 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N16 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> M0 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N13 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#BDBDBD" penwidth=1.5 style=solid dir=forward]
+	M1 -> N12 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_141.txt b/test/diagrams/graph_hard/diagrams_141.txt
new file mode 100644
index 0000000000000000000000000000000000000000..67bc3d3f646dc5c37f95e715691e1d81c7d345ac
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_141.txt
@@ -0,0 +1,34 @@
+<Child Protection Policies, connectedTo, Individualized Attention>
+<Child Psychology Application, connectedTo, Curriculum Planning>
+<Creative Arts Activities, observes, Story Time Reading>
+<Curriculum Planning, connectedTo, Playground Safety Inspection>
+<Daily Activity Reporting, connectedTo, Child Protection Policies>
+<Daily Activity Reporting, connectedTo, Individualized Attention>
+<Daily Activity Reporting, connectedTo, Toddler Activities>
+<Diaper Changing, connectedTo, Emergency Evacuation Drills>
+<Emergency Evacuation Drills, connectedTo, Enrollment and Admissions>
+<Enrollment and Admissions, connectedTo, Potty Training Assistance>
+<Enrollment and Admissions, connectedTo, Safety Supervision>
+<Individualized Attention, connectedTo, Learning Material Selection>
+<Learning Material Selection, connectedTo, Teacher_Child Ratio Management>
+<Motor Skill Development, connectedTo, Diaper Changing>
+<Music and Movement Activities, connectedTo, Individualized Attention>
+<Music and Movement Activities, connectedTo, Parent Communication>
+<Nutritional Meal Preparation, connectedTo, Child Protection Policies>
+<Nutritional Meal Preparation, connectedTo, Outdoor Play Supervision>
+<Outdoor Play Supervision, connectedTo, Motor Skill Development>
+<Outdoor Play Supervision, connectedTo, Preschool Education>
+<Outdoor Play Supervision, connectedTo, Safety Supervision>
+<Outdoor Play Supervision, connectedTo, Teacher_Child Ratio Management>
+<Outdoor Play Supervision, reports, Emergency Evacuation Drills>
+<Parent Communication, connectedTo, Staff Training and Certification>
+<Playground Safety Inspection, connectedTo, Learning Material Selection>
+<Potty Training Assistance, connectedTo, Creative Arts Activities>
+<Safety Supervision, connectedTo, Child Protection Policies>
+<Safety Supervision, connectedTo, Child Psychology Application>
+<Safety Supervision, connectedTo, Individualized Attention>
+<Staff Training and Certification, connectedTo, Child Protection Policies>
+<Staff Training and Certification, connectedTo, Daily Activity Reporting>
+<Story Time Reading, connectedTo, Diaper Changing>
+<Teacher_Child Ratio Management, connectedTo, Preschool Education>
+<Toddler Activities, connectedTo, Nutritional Meal Preparation>
diff --git a/test/diagrams/graph_hard/diagrams_142.dot b/test/diagrams/graph_hard/diagrams_142.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3b0adb9327d9712b5b4d040bf3cec643362e5fbc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_142.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=LR
+	N0 [label="Emotional Support and Counseling" color="#A2D0FF" fillcolor="#E8F0FF" shape=rect style=filled]
+	N1 [label="Caregiver Training" color="#FFB74D" fillcolor="#FFF3E0" shape=rectangle style=filled]
+	N2 [label="Palliative Care" color="#A2D0FF" fillcolor="#E8F0FF" shape=vnode_shape style=filled]
+	N3 [label="Long_Term Care Planning" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N4 [label="Financial Management Assistance" color="#FFB74D" fillcolor="#FFF3E0" shape=inputoutput style=filled]
+	N5 [label="Daily Living Assistance" color="#FFB74D" fillcolor="#FFF3E0" shape=vnode_shape style=filled]
+	N6 [label="Family Communication" color="#FFB74D" fillcolor="#FFF3E0" shape=inputoutput style=filled]
+	N7 [label="Telehealth for Seniors" color="#A2D0FF" fillcolor="#E8F0FF" shape=predefinedprocess style=filled]
+	N8 [label="Cognitive Stimulation Activities" color="#A2D0FF" fillcolor="#E8F0FF" shape=document style=filled]
+	N9 [label="Companionship" color="#7E57C2" fillcolor="#D1C4E9" shape=rect style=filled]
+	N10 [label="Smart Home Integration for Seniors" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N11 [label="Pain Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=action style=filled]
+	S0 [label="" color="#A2D0FF" fillcolor="#E8F0FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFB74D" fillcolor="#FFF3E0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Meal Preparation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Meal Preparation"
+		nest0_0 [label="Elder Abuse Prevention" color="#FFB74D" fillcolor="#FFF3E0" shape=inputoutput style=filled]
+		nest0_1 [label="Recreational Activities Planning" color="#A2D0FF" fillcolor="#E8F0FF" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Memory Care {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Memory Care"
+		nest1_0 [label="Respite Care" color="#7E57C2" fillcolor="#D1C4E9" shape=vnode_shape style=filled]
+		nest1_1 [label="Community Resource Connection" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#7E57C2" penwidth=1.5 style=dashed label="responds" dir=forward]
+	N3 -> N4 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFB74D" penwidth=1.5 style=dashed label="communicates" dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFB74D" penwidth=1.5 style=dashed label="assists" dir=forward]
+	N7 -> N8 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#FFB74D" penwidth=1.5 style=dashed label="educates" dir=forward]
+	nest0_1 -> N11 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest1_0 [color="#7E57C2" penwidth=1.5 style=solid label="feeds" dir=forward]
+	nest1_1 -> N7 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S0 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S1 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N8 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_142.txt b/test/diagrams/graph_hard/diagrams_142.txt
new file mode 100644
index 0000000000000000000000000000000000000000..af79042db0bf63a21acad88dd9d3bd508909b0da
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_142.txt
@@ -0,0 +1,24 @@
+<Caregiver Training, connectedTo, Palliative Care>
+<Cognitive Stimulation Activities, connectedTo, Companionship>
+<Community Resource Connection, connectedTo, Telehealth for Seniors>
+<Companionship, connectedTo, Smart Home Integration for Seniors>
+<Daily Living Assistance, connectedTo, Family Communication>
+<Daily Living Assistance, educates, Elder Abuse Prevention>
+<Daily Living Assistance, feeds, Respite Care>
+<Elder Abuse Prevention, connectedTo, Recreational Activities Planning>
+<Emotional Support and Counseling, connectedTo, Caregiver Training>
+<Emotional Support and Counseling, connectedTo, Cognitive Stimulation Activities>
+<Emotional Support and Counseling, connectedTo, Companionship>
+<Emotional Support and Counseling, connectedTo, Family Communication>
+<Emotional Support and Counseling, connectedTo, Pain Management>
+<Family Communication, assists, Telehealth for Seniors>
+<Family Communication, connectedTo, Cognitive Stimulation Activities>
+<Financial Management Assistance, communicates, Daily Living Assistance>
+<Financial Management Assistance, connectedTo, Cognitive Stimulation Activities>
+<Long_Term Care Planning, connectedTo, Cognitive Stimulation Activities>
+<Long_Term Care Planning, connectedTo, Financial Management Assistance>
+<Palliative Care, responds, Long_Term Care Planning>
+<Recreational Activities Planning, connectedTo, Pain Management>
+<Respite Care, connectedTo, Community Resource Connection>
+<Smart Home Integration for Seniors, connectedTo, Pain Management>
+<Telehealth for Seniors, connectedTo, Cognitive Stimulation Activities>
diff --git a/test/diagrams/graph_hard/diagrams_143.dot b/test/diagrams/graph_hard/diagrams_143.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1758c6a3ed622504baacdc2398a017f2b0c4e678
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_143.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=RL
+	N0 [label="Safety Assessments" color="#FFA726" fillcolor="#FFF3E0" shape=rect style=filled]
+	N1 [label="Palliative Care" color="#4CAF50" fillcolor="#C8E6C9" shape=multipledocuments style=filled]
+	N2 [label="Occupational Therapy" color="#FFA726" fillcolor="#FFF3E0" shape=rectangle style=filled]
+	N3 [label="Physical Therapy" color="#F06292" fillcolor="#FCE4EC" shape=action style=filled]
+	N4 [label="Cognitive Stimulation Activities" color="#FFA726" fillcolor="#FFF3E0" shape=action style=filled]
+	N5 [label="Meal Preparation" color="#FFA726" fillcolor="#FFF3E0" shape=document style=filled]
+	N6 [label="Hospice Care Coordination" color="#F06292" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+	S0 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Recreational Activities Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Recreational Activities Planning"
+		nest0_0 [label="Social Engagement Activities" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_1 [label="Medication Management" color="#FFA726" fillcolor="#FFF3E0" shape=multipledocuments style=filled]
+		nest0_2 [label="Emotional Support and Counseling" color="#FFA726" fillcolor="#FFF3E0" shape=multipledocuments style=filled]
+		nest0_3 [label="Rehabilitation Support" color="#4CAF50" fillcolor="#C8E6C9" shape=diamond style=filled]
+	}
+	subgraph cluster_Memory Care {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Memory Care"
+		nest1_0 [label="Dementia Care" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+		nest1_1 [label="Nursing Care" color="#4CAF50" fillcolor="#C8E6C9" shape=parallelogram style=filled]
+		nest1_2 [label="Mobility Support" color="#F06292" fillcolor="#FCE4EC" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed label="evaluates" dir=forward]
+	nest0_2 -> nest0_3 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest0_0 [color="#000000" penwidth=1.5 style=solid label="cares for" dir=forward]
+	nest0_3 -> N6 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#F06292" penwidth=1.5 style=solid label="escorts" dir=forward]
+	N1 -> nest1_0 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N1 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	S1 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N3 -> S2 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N5 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_143.txt b/test/diagrams/graph_hard/diagrams_143.txt
new file mode 100644
index 0000000000000000000000000000000000000000..72f30a9ee41c5a6913fc40648e0aa5dd03a3edc5
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_143.txt
@@ -0,0 +1,24 @@
+<Cognitive Stimulation Activities, cares for, Social Engagement Activities>
+<Cognitive Stimulation Activities, connectedTo, Meal Preparation>
+<Dementia Care, connectedTo, Nursing Care>
+<Emotional Support and Counseling, connectedTo, Rehabilitation Support>
+<Meal Preparation, connectedTo, Hospice Care Coordination>
+<Medication Management, evaluates, Emotional Support and Counseling>
+<Mobility Support, connectedTo, Palliative Care>
+<Nursing Care, escorts, Mobility Support>
+<Occupational Therapy, connectedTo, Meal Preparation>
+<Occupational Therapy, connectedTo, Physical Therapy>
+<Palliative Care, connectedTo, Cognitive Stimulation Activities>
+<Palliative Care, connectedTo, Dementia Care>
+<Palliative Care, connectedTo, Hospice Care Coordination>
+<Palliative Care, connectedTo, Meal Preparation>
+<Palliative Care, connectedTo, Occupational Therapy>
+<Palliative Care, connectedTo, Physical Therapy>
+<Physical Therapy, connectedTo, Cognitive Stimulation Activities>
+<Physical Therapy, connectedTo, Hospice Care Coordination>
+<Physical Therapy, connectedTo, Meal Preparation>
+<Rehabilitation Support, connectedTo, Hospice Care Coordination>
+<Safety Assessments, connectedTo, Hospice Care Coordination>
+<Safety Assessments, connectedTo, Meal Preparation>
+<Safety Assessments, connectedTo, Palliative Care>
+<Social Engagement Activities, connectedTo, Medication Management>
diff --git a/test/diagrams/graph_hard/diagrams_144.dot b/test/diagrams/graph_hard/diagrams_144.dot
new file mode 100644
index 0000000000000000000000000000000000000000..709498e3f0c165c9ee9b94d6485da606c8ddd6ef
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_144.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=BT
+	N0 [label="Legal Aid Referrals" color="#A1D7CD" fillcolor="#EDF5F3" shape=vnode_shape style=filled]
+	N1 [label="Rehabilitation Support" color="#FF9800" fillcolor="#FFE0B2" shape=action style=filled]
+	N2 [label="Transportation Assistance" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N3 [label="Mobility Support" color="#A1D7CD" fillcolor="#EDF5F3" shape=preparation style=filled]
+	N4 [label="Meal Preparation" color="#A1D7CD" fillcolor="#EDF5F3" shape=vnode_shape style=filled]
+	N5 [label="Nursing Care" color="#FF9800" fillcolor="#FFE0B2" shape=inputoutput style=filled]
+	N6 [label="Social Engagement Activities" color="#A1D7CD" fillcolor="#EDF5F3" shape=rect style=filled]
+	N7 [label="Cognitive Stimulation Activities" color="#A1D7CD" fillcolor="#EDF5F3" shape=rectangle style=filled]
+	N8 [label="Telehealth for Seniors" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N9 [label="Speech Therapy" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N10 [label="Care Plan Development" color="#F44336" fillcolor="#FFCDD2" shape=multipledocuments style=filled]
+	N11 [label="Incontinence Care" color="#F44336" fillcolor="#FFCDD2" shape=parallelogram style=filled]
+	N12 [label="Community Resource Connection" color="#A1D7CD" fillcolor="#EDF5F3" shape=diamond style=filled]
+	S0 [label="" color="#F44336" fillcolor="#FFCDD2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FF9800" fillcolor="#FFE0B2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Safety Assessments {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Safety Assessments"
+		nest0_0 [label="Nutritional Assessment" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest0_1 [label="Financial Management Assistance" color="#FF9800" fillcolor="#FFE0B2" shape=predefinedprocess style=filled]
+		nest0_2 [label="Emotional Support and Counseling" color="#F44336" fillcolor="#FFCDD2" shape=parallelogram style=filled]
+		nest0_3 [label="Memory Care" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	}
+	subgraph cluster_Chronic Disease Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Chronic Disease Management"
+		nest1_0 [label="Companionship" color="#A1D7CD" fillcolor="#EDF5F3" shape=preparation style=filled]
+		nest1_1 [label="Hospice Care Coordination" color="#A1D7CD" fillcolor="#EDF5F3" shape=action style=filled]
+		nest1_2 [label="Health Monitoring" color="#F44336" fillcolor="#FFCDD2" shape=inputoutput style=filled]
+		nest1_3 [label="Personal Care Assistance" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#F44336" penwidth=1.5 style=dashed label="advises" dir=forward]
+	N4 -> N5 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed label="bathes" dir=forward]
+	N6 -> N7 [color="#A1D7CD" penwidth=1.5 style=dashed label="prevents" dir=forward]
+	N7 -> N8 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#F44336" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#F44336" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest0_0 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N4 [color="#F44336" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	N11 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N5 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S0 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#000000" penwidth=1.5 style=dashed label="recommends" dir=forward]
+	S0 -> N10 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	M0 -> N7 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N12 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_144.txt b/test/diagrams/graph_hard/diagrams_144.txt
new file mode 100644
index 0000000000000000000000000000000000000000..55afe32e904584bcc3b0269cfa6f392b45e007cc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_144.txt
@@ -0,0 +1,30 @@
+<Care Plan Development, connectedTo, Incontinence Care>
+<Cognitive Stimulation Activities, connectedTo, Telehealth for Seniors>
+<Companionship, connectedTo, Hospice Care Coordination>
+<Emotional Support and Counseling, connectedTo, Memory Care>
+<Financial Management Assistance, connectedTo, Emotional Support and Counseling>
+<Health Monitoring, connectedTo, Personal Care Assistance>
+<Hospice Care Coordination, connectedTo, Health Monitoring>
+<Incontinence Care, connectedTo, Community Resource Connection>
+<Incontinence Care, connectedTo, Companionship>
+<Legal Aid Referrals, connectedTo, Cognitive Stimulation Activities>
+<Legal Aid Referrals, connectedTo, Rehabilitation Support>
+<Meal Preparation, connectedTo, Nursing Care>
+<Meal Preparation, connectedTo, Nutritional Assessment>
+<Memory Care, connectedTo, Meal Preparation>
+<Mobility Support, advises, Meal Preparation>
+<Nursing Care, bathes, Social Engagement Activities>
+<Nursing Care, connectedTo, Care Plan Development>
+<Nursing Care, connectedTo, Cognitive Stimulation Activities>
+<Nursing Care, connectedTo, Incontinence Care>
+<Nursing Care, connectedTo, Speech Therapy>
+<Nursing Care, recommends, Community Resource Connection>
+<Nutritional Assessment, connectedTo, Financial Management Assistance>
+<Personal Care Assistance, connectedTo, Community Resource Connection>
+<Personal Care Assistance, connectedTo, Financial Management Assistance>
+<Personal Care Assistance, connectedTo, Nursing Care>
+<Rehabilitation Support, connectedTo, Transportation Assistance>
+<Social Engagement Activities, prevents, Cognitive Stimulation Activities>
+<Speech Therapy, connectedTo, Care Plan Development>
+<Telehealth for Seniors, connectedTo, Speech Therapy>
+<Transportation Assistance, connectedTo, Mobility Support>
diff --git a/test/diagrams/graph_hard/diagrams_145.dot b/test/diagrams/graph_hard/diagrams_145.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8c10d91faca82d97eae703b97c385764343af5fe
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_145.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=BT
+	N0 [label="Logistics and Supply Chain" color="#4DD0E1" fillcolor="#C9F0F0" shape=database style=filled]
+	N1 [label="Hazard Identification" color="#BA68C8" fillcolor="#F3E5F5" shape=action style=filled]
+	N2 [label="Hazard Mapping" color="#4DD0E1" fillcolor="#C9F0F0" shape=diamond style=filled]
+	N3 [label="Capacity Building for Local Communities" color="#BA68C8" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N4 [label="Reconstruction" color="#795548" fillcolor="#D7CCC8" shape=multipledocuments style=filled]
+	N5 [label="Incident Command System" color="#BA68C8" fillcolor="#F3E5F5" shape=inputoutput style=filled]
+	N6 [label="Debris Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=inputoutput style=filled]
+	N7 [label="Communication Protocols" color="#4DD0E1" fillcolor="#C9F0F0" shape=rect style=filled]
+	N8 [label="Resilience Building" color="#795548" fillcolor="#D7CCC8" shape=rect style=filled]
+	N9 [label="International Aid Coordination" color="#BA68C8" fillcolor="#F3E5F5" shape=document style=filled]
+	N10 [label="Resource Mobilization" color="#795548" fillcolor="#D7CCC8" shape=database style=filled]
+	N11 [label="Risk Assessment" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N12 [label="Recovery Planning" color="#BA68C8" fillcolor="#F3E5F5" shape=rect style=filled]
+	S0 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4DD0E1" fillcolor="#C9F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Search and Rescue Operations {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Search and Rescue Operations"
+		nest0_0 [label="Cash Transfer Programs" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest0_1 [label="Infrastructure Repair" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+		nest0_2 [label="Volunteer Coordination" color="#BA68C8" fillcolor="#F3E5F5" shape=inputoutput style=filled]
+		nest0_3 [label="Early Recovery Actions" color="#BA68C8" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Psychosocial Support {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Psychosocial Support"
+		nest1_0 [label="Policy and Legislation Review" color="#4DD0E1" fillcolor="#C9F0F0" shape=vnode_shape style=filled]
+		nest1_1 [label="Mitigation Strategies" color="#BA68C8" fillcolor="#F3E5F5" shape=inputoutput style=filled]
+		nest1_2 [label="Economic Recovery Initiatives" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest1_3 [label="Evacuation Procedures" color="#4DD0E1" fillcolor="#C9F0F0" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#BA68C8" penwidth=1.5 style=solid label="restores" dir=forward]
+	N6 -> N7 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#795548" penwidth=1.5 style=dashed label="enforces" dir=forward]
+	N9 -> N10 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N9 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> M2 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N8 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_146.txt b/test/diagrams/graph_hard/diagrams_146.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9fc22f7a3d25946627597b0bd83703b919a7a613
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_146.txt
@@ -0,0 +1,36 @@
+<Cash Transfer Programs, connectedTo, Environmental Remediation>
+<Communication Protocols, connectedTo, Economic Recovery Initiatives>
+<Community Preparedness, connectedTo, Psychosocial Support>
+<Community Preparedness, connectedTo, Shelter Management>
+<Debris Management, connectedTo, Satellite Imagery Analysis>
+<Early Recovery Actions, connectedTo, Debris Management>
+<Early Warning Systems, connectedTo, Cash Transfer Programs>
+<Economic Recovery Initiatives, connectedTo, Vulnerability Analysis>
+<Emergency Planning, connectedTo, Resilience Building>
+<Emergency Response, connectedTo, Policy and Legislation Review>
+<Environmental Remediation, connectedTo, Evacuation Procedures>
+<Geographic Information Systems for Disasters, connectedTo, Cash Transfer Programs>
+<Geographic Information Systems for Disasters, connectedTo, Early Warning Systems>
+<Geographic Information Systems for Disasters, connectedTo, Environmental Remediation>
+<Geographic Information Systems for Disasters, connectedTo, Evacuation Procedures>
+<Incident Command System, connectedTo, Shelter Management>
+<Information Dissemination, connectedTo, Communication Protocols>
+<Information Dissemination, connectedTo, Emergency Planning>
+<Information Dissemination, connectedTo, Search and Rescue Operations>
+<Information Dissemination, connectedTo, Shelter Management>
+<Logistics and Supply Chain, connectedTo, Resilience Building>
+<Logistics and Supply Chain, connectedTo, Volunteer Coordination>
+<Medical Aid Deployment, connectedTo, Information Dissemination>
+<Medical Aid Deployment, connectedTo, Resilience Building>
+<Policy and Legislation Review, connectedTo, Community Preparedness>
+<Post_Disaster Evaluation, connectedTo, Early Recovery Actions>
+<Psychosocial Support, connectedTo, Incident Command System>
+<Resilience Building, connectedTo, Emergency Response>
+<Satellite Imagery Analysis, connectedTo, Environmental Remediation>
+<Search and Rescue Operations, connectedTo, Logistics and Supply Chain>
+<Search and Rescue Operations, connectedTo, Resilience Building>
+<Shelter Management, connectedTo, Geographic Information Systems for Disasters>
+<Volunteer Coordination, connectedTo, Emergency Planning>
+<Volunteer Coordination, connectedTo, Post_Disaster Evaluation>
+<Volunteer Coordination, connectedTo, Shelter Management>
+<Vulnerability Analysis, connectedTo, Evacuation Procedures>
diff --git a/test/diagrams/graph_hard/diagrams_147.dot b/test/diagrams/graph_hard/diagrams_147.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a83f2f70d4188473895f112b8990bf400d3a3c21
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_147.dot
@@ -0,0 +1,88 @@
+digraph {
+	rankdir=LR
+	N0 [label="Satellite Imagery Analysis" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+	N1 [label="Infrastructure Repair" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N2 [label="Communication Protocols" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N3 [label="Medical Aid Deployment" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N4 [label="Risk Assessment" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N5 [label="Evacuation Procedures" color="#80DDEA" fillcolor="#D3F7F9" shape=document style=filled]
+	N6 [label="Geographic Information Systems for Disasters" color="#80DDEA" fillcolor="#D3F7F9" shape=parallelogram style=filled]
+	N7 [label="Early Warning Systems" color="#FFF9AE" fillcolor="#FFFCE6" shape=action style=filled]
+	N8 [label="Logistics and Supply Chain" color="#80DDEA" fillcolor="#D3F7F9" shape=vnode_shape style=filled]
+	N9 [label="International Aid Coordination" color="#FFF9AE" fillcolor="#FFFCE6" shape=action style=filled]
+	N10 [label="Resilience Building" color="#A188D0" fillcolor="#DACBE3" shape=database style=filled]
+	N11 [label="Cash Transfer Programs" color="#80DDEA" fillcolor="#D3F7F9" shape=inputoutput style=filled]
+	N12 [label="Emergency Response" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N13 [label="Resource Mobilization" color="#80DDEA" fillcolor="#D3F7F9" shape=diamond style=filled]
+	N14 [label="Climate Change Adaptation for Disasters" color="#80DDEA" fillcolor="#D3F7F9" shape=database style=filled]
+	N15 [label="Reconstruction" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N16 [label="Vulnerability Analysis" color="#A188D0" fillcolor="#DACBE3" shape=parallelogram style=filled]
+	N17 [label="Debris Management" color="#80DDEA" fillcolor="#D3F7F9" shape=preparation style=filled]
+	N18 [label="Post_Disaster Evaluation" color="#A188D0" fillcolor="#DACBE3" shape=database style=filled]
+	N19 [label="Community Preparedness" color="#80DDEA" fillcolor="#D3F7F9" shape=rectangle style=filled]
+	S0 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Hazard Mapping {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Hazard Mapping"
+		nest0_0 [label="Shelter Management" color="#80DDEA" fillcolor="#D3F7F9" shape=parallelogram style=filled]
+		nest0_1 [label="Information Dissemination" color="#80DDEA" fillcolor="#D3F7F9" shape=action style=filled]
+	}
+	subgraph cluster_Emergency Drills and Exercises {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Emergency Drills and Exercises"
+		nest1_0 [label="Incident Command System" color="#80DDEA" fillcolor="#D3F7F9" shape=rectangle style=filled]
+		nest1_1 [label="Drone Deployment for Assessment" color="#FFF9AE" fillcolor="#FFFCE6" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed label="plans" dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid label="treats" dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N17 -> N18 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N18 -> N19 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N10 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S0 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S1 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=dashed label="analyzes" dir=forward]
+	S1 -> N10 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N14 -> S2 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N17 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	S2 -> N18 [color="#000000" penwidth=1.5 style=dashed label="provides" dir=forward]
+	S2 -> N19 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M0 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#A188D0" penwidth=1.5 style=dashed label="simulates" dir=forward]
+	M0 -> N13 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#A188D0" penwidth=1.5 style=dashed label="audits" dir=forward]
+	N7 -> M1 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M1 [color="#A188D0" penwidth=1.5 style=dashed label="mobilizes" dir=forward]
+	M1 -> N13 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_147.txt b/test/diagrams/graph_hard/diagrams_147.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9b294fed21ca711c2a5961c6adcc4f9530747721
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_147.txt
@@ -0,0 +1,41 @@
+<Cash Transfer Programs, connectedTo, Emergency Response>
+<Climate Change Adaptation for Disasters, connectedTo, Community Preparedness>
+<Climate Change Adaptation for Disasters, connectedTo, Debris Management>
+<Climate Change Adaptation for Disasters, connectedTo, Reconstruction>
+<Climate Change Adaptation for Disasters, provides, Post_Disaster Evaluation>
+<Communication Protocols, connectedTo, Medical Aid Deployment>
+<Communication Protocols, connectedTo, Shelter Management>
+<Communication Protocols, simulates, Resource Mobilization>
+<Debris Management, connectedTo, Post_Disaster Evaluation>
+<Drone Deployment for Assessment, connectedTo, Resilience Building>
+<Early Warning Systems, analyzes, Cash Transfer Programs>
+<Early Warning Systems, connectedTo, Climate Change Adaptation for Disasters>
+<Early Warning Systems, connectedTo, Logistics and Supply Chain>
+<Early Warning Systems, connectedTo, Resilience Building>
+<Early Warning Systems, connectedTo, Resource Mobilization>
+<Emergency Response, connectedTo, Resource Mobilization>
+<Evacuation Procedures, connectedTo, Cash Transfer Programs>
+<Evacuation Procedures, connectedTo, Geographic Information Systems for Disasters>
+<Evacuation Procedures, connectedTo, International Aid Coordination>
+<Evacuation Procedures, connectedTo, Reconstruction>
+<Evacuation Procedures, connectedTo, Resource Mobilization>
+<Geographic Information Systems for Disasters, connectedTo, Early Warning Systems>
+<Geographic Information Systems for Disasters, connectedTo, Resource Mobilization>
+<Incident Command System, connectedTo, Drone Deployment for Assessment>
+<Information Dissemination, connectedTo, Risk Assessment>
+<Infrastructure Repair, connectedTo, Communication Protocols>
+<International Aid Coordination, connectedTo, Incident Command System>
+<International Aid Coordination, connectedTo, Resource Mobilization>
+<International Aid Coordination, treats, Resilience Building>
+<Logistics and Supply Chain, connectedTo, International Aid Coordination>
+<Logistics and Supply Chain, mobilizes, Resource Mobilization>
+<Medical Aid Deployment, audits, Resource Mobilization>
+<Medical Aid Deployment, connectedTo, Risk Assessment>
+<Post_Disaster Evaluation, connectedTo, Community Preparedness>
+<Reconstruction, connectedTo, Vulnerability Analysis>
+<Resilience Building, connectedTo, Cash Transfer Programs>
+<Resource Mobilization, connectedTo, Climate Change Adaptation for Disasters>
+<Risk Assessment, plans, Evacuation Procedures>
+<Satellite Imagery Analysis, connectedTo, Infrastructure Repair>
+<Shelter Management, connectedTo, Information Dissemination>
+<Vulnerability Analysis, connectedTo, Debris Management>
diff --git a/test/diagrams/graph_hard/diagrams_148.txt b/test/diagrams/graph_hard/diagrams_148.txt
new file mode 100644
index 0000000000000000000000000000000000000000..243cf907bf91bf6a47e7b8b9b1a8cb78c9387c72
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_148.txt
@@ -0,0 +1,38 @@
+<Air Operations, connectedTo, Intelligence Gathering>
+<Chaplain Services, connectedTo, Air Operations>
+<Chaplain Services, trains, Intelligence Gathering>
+<Civil_Military Cooperation, connectedTo, Peacekeeping Missions>
+<Counter_Terrorism Operations, commands, Ground Operations>
+<Counter_Terrorism Operations, connectedTo, Air Operations>
+<Counter_Terrorism Operations, researches, Intelligence Gathering>
+<Defense Procurement, connectedTo, Air Operations>
+<Defense Procurement, connectedTo, Counter_Terrorism Operations>
+<Defense Procurement, connectedTo, Intelligence Gathering>
+<Demobilization, connectedTo, Air Operations>
+<Demobilization, connectedTo, Chaplain Services>
+<Family Support Programs, protects, Military Law>
+<Force Projection, connectedTo, Military Law>
+<Ground Operations, connectedTo, Air Operations>
+<Ground Operations, connectedTo, Demobilization>
+<Ground Operations, connectedTo, Intelligence Gathering>
+<Ground Operations, connectedTo, Personnel Management>
+<Intelligence Gathering, connectedTo, Civil_Military Cooperation>
+<Intelligence Gathering, connectedTo, Force Projection>
+<Intelligence Gathering, connectedTo, Peacekeeping Missions>
+<Intelligence Gathering, connectedTo, Recruitment>
+<Intelligence Gathering, connectedTo, Space Operations>
+<Intelligence Gathering, connectedTo, Specialized Training>
+<Intelligence Gathering, recruits, Disaster Relief Deployment>
+<Medical Support, connectedTo, Family Support Programs>
+<Military Law, connectedTo, Disaster Relief Deployment>
+<Military Strategy Development, connectedTo, Naval Operations>
+<Naval Operations, connectedTo, Rules of Engagement>
+<Peacekeeping Missions, attacks, Unmanned Systems Operation>
+<Peacekeeping Missions, surveys, Recruitment>
+<Personnel Management, connectedTo, Medical Support>
+<Recruitment, connectedTo, Weapon Systems Development>
+<Rules of Engagement, connectedTo, Air Operations>
+<Space Operations, connectedTo, Specialized Training>
+<Specialized Training, connectedTo, Civil_Military Cooperation>
+<Unmanned Systems Operation, connectedTo, Military Strategy Development>
+<Weapon Systems Development, connectedTo, Force Projection>
diff --git a/test/diagrams/graph_hard/diagrams_149.dot b/test/diagrams/graph_hard/diagrams_149.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e84915e5eeade8c22730db815270b57578cd0488
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_149.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=RL
+	N0 [label="Intelligence Gathering" color="#80DDEA" fillcolor="#D3F7F9" shape=preparation style=filled]
+	N1 [label="Operations Planning" color="#FFCC7A" fillcolor="#FFF6D9" shape=rect style=filled]
+	N2 [label="Family Support Programs" color="#80DDEA" fillcolor="#D3F7F9" shape=document style=filled]
+	N3 [label="Counter_Insurgency Operations" color="#80DDEA" fillcolor="#D3F7F9" shape=predefinedprocess style=filled]
+	N4 [label="Military Strategy Development" color="#CD8FF2" fillcolor="#ECCFF5" shape=hexagon style=filled]
+	N5 [label="Specialized Training" color="#FFCC7A" fillcolor="#FFF6D9" shape=database style=filled]
+	N6 [label="Rules of Engagement" color="#80DDEA" fillcolor="#D3F7F9" shape=vnode_shape style=filled]
+	N7 [label="Targeting" color="#CD8FF2" fillcolor="#ECCFF5" shape=vnode_shape style=filled]
+	N8 [label="Defense Procurement" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N9 [label="Weapon Systems Development" color="#FFCC7A" fillcolor="#FFF6D9" shape=preparation style=filled]
+	N10 [label="Electronic Warfare" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+	N11 [label="Equipment Maintenance" color="#FFCC7A" fillcolor="#FFF6D9" shape=preparation style=filled]
+	S0 [label="" color="#FFCC7A" fillcolor="#FFF6D9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFCC7A" fillcolor="#FFF6D9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Ground Operations {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Ground Operations"
+		nest0_0 [label="Veteran Support" color="#80DDEA" fillcolor="#D3F7F9" shape=rectangle style=filled]
+		nest0_1 [label="Readiness Assessment" color="#FFCC7A" fillcolor="#FFF6D9" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Disaster Relief Deployment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Disaster Relief Deployment"
+		nest1_0 [label="Recruitment" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+		nest1_1 [label="Force Projection" color="#80DDEA" fillcolor="#D3F7F9" shape=predefinedprocess style=filled]
+		nest1_2 [label="Military Law" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+		nest1_3 [label="Combat Operations" color="#80DDEA" fillcolor="#D3F7F9" shape=database style=filled]
+	}
+	N0 -> N1 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest0_0 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N9 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FFCC7A" penwidth=1.5 style=solid label="researches" dir=forward]
+	nest1_1 -> nest1_2 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N1 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N8 -> S0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S1 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N1 -> S2 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N5 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	S2 -> N4 [color="#CD8FF2" penwidth=1.5 style=solid label="commands" dir=forward]
+	N2 -> M0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N6 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_149.txt b/test/diagrams/graph_hard/diagrams_149.txt
new file mode 100644
index 0000000000000000000000000000000000000000..dce7e55a401ea8ea8d7ef4113b1d4d53d47fdd85
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_149.txt
@@ -0,0 +1,30 @@
+<Combat Operations, connectedTo, Operations Planning>
+<Counter_Insurgency Operations, connectedTo, Military Strategy Development>
+<Defense Procurement, connectedTo, Electronic Warfare>
+<Defense Procurement, connectedTo, Equipment Maintenance>
+<Defense Procurement, connectedTo, Weapon Systems Development>
+<Electronic Warfare, connectedTo, Equipment Maintenance>
+<Electronic Warfare, connectedTo, Veteran Support>
+<Family Support Programs, connectedTo, Counter_Insurgency Operations>
+<Family Support Programs, connectedTo, Defense Procurement>
+<Family Support Programs, connectedTo, Electronic Warfare>
+<Family Support Programs, connectedTo, Specialized Training>
+<Family Support Programs, connectedTo, Targeting>
+<Force Projection, connectedTo, Military Law>
+<Intelligence Gathering, connectedTo, Operations Planning>
+<Intelligence Gathering, connectedTo, Rules of Engagement>
+<Military Law, connectedTo, Combat Operations>
+<Military Strategy Development, connectedTo, Specialized Training>
+<Operations Planning, commands, Military Strategy Development>
+<Operations Planning, connectedTo, Defense Procurement>
+<Operations Planning, connectedTo, Family Support Programs>
+<Operations Planning, connectedTo, Rules of Engagement>
+<Operations Planning, connectedTo, Specialized Training>
+<Readiness Assessment, connectedTo, Weapon Systems Development>
+<Recruitment, researches, Force Projection>
+<Rules of Engagement, connectedTo, Targeting>
+<Specialized Training, connectedTo, Rules of Engagement>
+<Targeting, connectedTo, Defense Procurement>
+<Veteran Support, connectedTo, Readiness Assessment>
+<Weapon Systems Development, connectedTo, Electronic Warfare>
+<Weapon Systems Development, connectedTo, Recruitment>
diff --git a/test/diagrams/graph_hard/diagrams_15.dot b/test/diagrams/graph_hard/diagrams_15.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1dcec217c27b953b6a9936ea06caaf76f6ef3ee5
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_15.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=TB
+	N0 [label="User Account Management" color="#4DB6AC" fillcolor="#E0F2F1" shape=vnode_shape style=filled]
+	N1 [label="Promotion Application" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N2 [label="Price Adjustment" color="#4DB6AC" fillcolor="#E0F2F1" shape=diamond style=filled]
+	N3 [label="Product Listing" color="#4DB6AC" fillcolor="#E0F2F1" shape=database style=filled]
+	N4 [label="Up_selling Offer" color="#E57373" fillcolor="#FFEBEE" shape=action style=filled]
+	N5 [label="Stock Replenishment" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N6 [label="Product Recommendation" color="#4DB6AC" fillcolor="#E0F2F1" shape=predefinedprocess style=filled]
+	N7 [label="Add to Cart" color="#E57373" fillcolor="#FFEBEE" shape=database style=filled]
+	N8 [label="Return Merchandise Authorization" color="#4DB6AC" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N9 [label="Delivery Rescheduling" color="#E57373" fillcolor="#FFEBEE" shape=diamond style=filled]
+	N10 [label="Customer Inquiry" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N11 [label="Cross_selling Recommendation" color="#E57373" fillcolor="#FFEBEE" shape=vnode_shape style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4DB6AC" fillcolor="#E0F2F1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Social Media Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Social Media Integration"
+		nest0_0 [label="Customer Review" color="#E57373" fillcolor="#FFEBEE" shape=rectangle style=filled]
+		nest0_1 [label="Marketing Campaign Launch" color="#FFA726" fillcolor="#FFF3E0" shape=rectangle style=filled]
+		nest0_2 [label="Checkout" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+		nest0_3 [label="Gift Card Purchase" color="#4DB6AC" fillcolor="#E0F2F1" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Affiliate Marketing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Affiliate Marketing"
+		nest1_0 [label="Warehouse Management" color="#E57373" fillcolor="#FFEBEE" shape=parallelogram style=filled]
+		nest1_1 [label="Live Chat Support" color="#E57373" fillcolor="#FFEBEE" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N10 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest1_0 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N6 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S0 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest0_1 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_15.txt b/test/diagrams/graph_hard/diagrams_15.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4186d4668162a22e03dc2eb514344ca1dcf1d467
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_15.txt
@@ -0,0 +1,26 @@
+<Add to Cart, connectedTo, Return Merchandise Authorization>
+<Add to Cart, connectedTo, Warehouse Management>
+<Checkout, connectedTo, Gift Card Purchase>
+<Customer Inquiry, connectedTo, Cross_selling Recommendation>
+<Customer Review, connectedTo, Marketing Campaign Launch>
+<Delivery Rescheduling, connectedTo, Customer Inquiry>
+<Gift Card Purchase, connectedTo, Customer Inquiry>
+<Live Chat Support, connectedTo, Product Recommendation>
+<Marketing Campaign Launch, connectedTo, Checkout>
+<Price Adjustment, connectedTo, Product Listing>
+<Product Listing, connectedTo, Customer Review>
+<Product Listing, connectedTo, Up_selling Offer>
+<Product Recommendation, connectedTo, Add to Cart>
+<Promotion Application, connectedTo, Delivery Rescheduling>
+<Promotion Application, connectedTo, Price Adjustment>
+<Promotion Application, connectedTo, Product Recommendation>
+<Promotion Application, connectedTo, Stock Replenishment>
+<Return Merchandise Authorization, connectedTo, Delivery Rescheduling>
+<Return Merchandise Authorization, connectedTo, Marketing Campaign Launch>
+<Stock Replenishment, connectedTo, Product Recommendation>
+<Up_selling Offer, connectedTo, Add to Cart>
+<Up_selling Offer, connectedTo, Customer Inquiry>
+<Up_selling Offer, connectedTo, Delivery Rescheduling>
+<Up_selling Offer, connectedTo, Stock Replenishment>
+<User Account Management, connectedTo, Promotion Application>
+<Warehouse Management, connectedTo, Live Chat Support>
diff --git a/test/diagrams/graph_hard/diagrams_150.dot b/test/diagrams/graph_hard/diagrams_150.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6ddcb89e8f77e284d66342ee45e4b4c9bd925cd6
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_150.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=RL
+	N0 [label="Unmanned Systems Operation" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N1 [label="Surveillance" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N2 [label="Reconnaissance" color="#2196F3" fillcolor="#BBDEFB" shape=document style=filled]
+	N3 [label="Operations Planning" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N4 [label="Naval Operations" color="#2196F3" fillcolor="#BBDEFB" shape=parallelogram style=filled]
+	N5 [label="Recruitment" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N6 [label="Demobilization" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N7 [label="Troop Deployment" color="#2196F3" fillcolor="#BBDEFB" shape=multipledocuments style=filled]
+	N8 [label="Weapon Systems Development" color="#E91E63" fillcolor="#FCE4EC" shape=database style=filled]
+	N9 [label="Personnel Management" color="#2196F3" fillcolor="#BBDEFB" shape=preparation style=filled]
+	N10 [label="Specialized Training" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N11 [label="Counter_Terrorism Operations" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+	N12 [label="Family Support Programs" color="#E91E63" fillcolor="#FCE4EC" shape=action style=filled]
+	N13 [label="Electronic Warfare" color="#9C27B0" fillcolor="#E1BEE7" shape=rect style=filled]
+	N14 [label="Counter_Insurgency Operations" color="#2196F3" fillcolor="#BBDEFB" shape=action style=filled]
+	N15 [label="Civil_Military Cooperation" color="#2196F3" fillcolor="#BBDEFB" shape=multipledocuments style=filled]
+	N16 [label="Ground Operations" color="#E91E63" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+	S0 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#2196F3" fillcolor="#BBDEFB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#2196F3" fillcolor="#BBDEFB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Air Operations {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Air Operations"
+		nest0_0 [label="Supply Chain Management" color="#2196F3" fillcolor="#BBDEFB" shape=action style=filled]
+		nest0_1 [label="Intelligence Gathering" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	}
+	subgraph cluster_Veteran Support {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Veteran Support"
+		nest1_0 [label="Medical Support" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+		nest1_1 [label="Space Operations" color="#2196F3" fillcolor="#BBDEFB" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N14 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N16 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#2196F3" penwidth=1.5 style=dashed label="innovates" dir=forward]
+	N9 -> nest1_0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N3 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#E91E63" penwidth=1.5 style=solid label="deploys" dir=forward]
+	S0 -> N8 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N7 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N13 -> M1 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	M1 -> N15 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_150.txt b/test/diagrams/graph_hard/diagrams_150.txt
new file mode 100644
index 0000000000000000000000000000000000000000..926b9fd10a7c63a649037cb9fba25d5a66198c23
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_150.txt
@@ -0,0 +1,33 @@
+<Civil_Military Cooperation, connectedTo, Ground Operations>
+<Counter_Insurgency Operations, connectedTo, Civil_Military Cooperation>
+<Counter_Insurgency Operations, connectedTo, Supply Chain Management>
+<Counter_Terrorism Operations, connectedTo, Family Support Programs>
+<Demobilization, connectedTo, Troop Deployment>
+<Electronic Warfare, connectedTo, Civil_Military Cooperation>
+<Electronic Warfare, connectedTo, Counter_Insurgency Operations>
+<Family Support Programs, connectedTo, Electronic Warfare>
+<Intelligence Gathering, connectedTo, Ground Operations>
+<Medical Support, innovates, Space Operations>
+<Naval Operations, connectedTo, Counter_Insurgency Operations>
+<Naval Operations, connectedTo, Family Support Programs>
+<Naval Operations, connectedTo, Personnel Management>
+<Naval Operations, connectedTo, Recruitment>
+<Naval Operations, connectedTo, Troop Deployment>
+<Operations Planning, connectedTo, Naval Operations>
+<Personnel Management, connectedTo, Medical Support>
+<Personnel Management, connectedTo, Specialized Training>
+<Reconnaissance, connectedTo, Operations Planning>
+<Recruitment, connectedTo, Civil_Military Cooperation>
+<Recruitment, connectedTo, Demobilization>
+<Recruitment, connectedTo, Troop Deployment>
+<Space Operations, connectedTo, Operations Planning>
+<Specialized Training, connectedTo, Counter_Terrorism Operations>
+<Supply Chain Management, connectedTo, Intelligence Gathering>
+<Surveillance, connectedTo, Naval Operations>
+<Surveillance, connectedTo, Reconnaissance>
+<Surveillance, connectedTo, Weapon Systems Development>
+<Surveillance, deploys, Civil_Military Cooperation>
+<Troop Deployment, connectedTo, Weapon Systems Development>
+<Unmanned Systems Operation, connectedTo, Civil_Military Cooperation>
+<Unmanned Systems Operation, connectedTo, Surveillance>
+<Weapon Systems Development, connectedTo, Personnel Management>
diff --git a/test/diagrams/graph_hard/diagrams_151.dot b/test/diagrams/graph_hard/diagrams_151.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4b2e58b6fea185a90c5dd172f82faa43fa2517e9
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_151.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=LR
+	N0 [label="Air Cargo Logistics" color="#E0E0E0" fillcolor="#EBEBEB" shape=multipledocuments style=filled]
+	N1 [label="Fleet Management" color="#E0E0E0" fillcolor="#EBEBEB" shape=rectangle style=filled]
+	N2 [label="Passenger Check_in" color="#E0E0E0" fillcolor="#EBEBEB" shape=predefinedprocess style=filled]
+	N3 [label="Weather Briefing" color="#FF8A65" fillcolor="#FBE9E7" shape=rectangle style=filled]
+	N4 [label="Airport Operations" color="#4CAF50" fillcolor="#C8E6C9" shape=database style=filled]
+	N5 [label="Security Screening" color="#FF8A65" fillcolor="#FBE9E7" shape=database style=filled]
+	N6 [label="Passenger Boarding" color="#E0E0E0" fillcolor="#EBEBEB" shape=multipledocuments style=filled]
+	N7 [label="Aircraft Manufacturing" color="#4CAF50" fillcolor="#C8E6C9" shape=inputoutput style=filled]
+	N8 [label="Baggage Handling" color="#FF8A65" fillcolor="#FBE9E7" shape=rect style=filled]
+	N9 [label="Ground Support" color="#FF8A65" fillcolor="#FBE9E7" shape=diamond style=filled]
+	N10 [label="Crew Resource Management" color="#4CAF50" fillcolor="#C8E6C9" shape=document style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FF8A65" fillcolor="#FBE9E7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#E0E0E0" fillcolor="#EBEBEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#E0E0E0" fillcolor="#EBEBEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Noise Abatement Procedures {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Noise Abatement Procedures"
+		nest0_0 [label="Unmanned Aerial Vehicle Integration" color="#FF8A65" fillcolor="#FBE9E7" shape=document style=filled]
+		nest0_1 [label="Aviation Safety Investigation" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+		nest0_2 [label="Aerospace Engineering" color="#4CAF50" fillcolor="#C8E6C9" shape=predefinedprocess style=filled]
+		nest0_3 [label="Airport Security Management" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	}
+	subgraph cluster_Air Traffic Control {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Air Traffic Control"
+		nest1_0 [label="Sustainable Aviation Fuel Development" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+		nest1_1 [label="Avionics Repair" color="#E0E0E0" fillcolor="#EBEBEB" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest0_0 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N6 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N1 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S0 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N3 [color="#FF8A65" penwidth=1.5 style=dashed label="documents" dir=forward]
+	S0 -> N7 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	S0 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S1 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N0 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	S2 -> N2 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N10 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_152.dot b/test/diagrams/graph_hard/diagrams_152.dot
new file mode 100644
index 0000000000000000000000000000000000000000..706f4ae19843bbc2fb11de8f7daa97244941f82a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_152.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=LR
+	N0 [label="Regulatory Compliance" color="#90A4AE" fillcolor="#ECEFF1" shape=action style=filled]
+	N1 [label="Passenger Check_in" color="#FFE470" fillcolor="#FFFAE0" shape=diamond style=filled]
+	N2 [label="Aerospace Engineering" color="#FFE470" fillcolor="#FFFAE0" shape=diamond style=filled]
+	N3 [label="Air Cargo Logistics" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	N4 [label="Airworthiness Certification" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+	N5 [label="Airport Operations" color="#FFE470" fillcolor="#FFFAE0" shape=action style=filled]
+	N6 [label="Gate Assignment" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	N7 [label="Aircraft Maintenance" color="#90A4AE" fillcolor="#ECEFF1" shape=rect style=filled]
+	N8 [label="Emergency Procedures Training" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	S0 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFE470" fillcolor="#FFFAE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Aviation Safety Investigation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Aviation Safety Investigation"
+		nest0_0 [label="Engine Overhaul" color="#FFE470" fillcolor="#FFFAE0" shape=parallelogram style=filled]
+		nest0_1 [label="Fleet Management" color="#90A4AE" fillcolor="#ECEFF1" shape=action style=filled]
+	}
+	subgraph cluster_Flight Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Flight Planning"
+		nest1_0 [label="Flight Simulation" color="#AED581" fillcolor="#F0F4C3" shape=rect style=filled]
+		nest1_1 [label="Crew Scheduling" color="#AED581" fillcolor="#F0F4C3" shape=document style=filled]
+		nest1_2 [label="In_flight Service" color="#90A4AE" fillcolor="#ECEFF1" shape=parallelogram style=filled]
+		nest1_3 [label="Ground Support" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFE470" penwidth=1.5 style=dashed label="alerts" dir=forward]
+	N2 -> N3 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N3 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest1_0 [color="#AED581" penwidth=1.5 style=dashed label="assembles" dir=forward]
+	nest1_3 -> N5 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N2 -> S0 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N5 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#FFE470" penwidth=1.5 style=solid label="monitors" dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	M1 -> N4 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_152.txt b/test/diagrams/graph_hard/diagrams_152.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7907178768d8e0f698d64c3c31d800ddac0222fe
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_152.txt
@@ -0,0 +1,25 @@
+<Aerospace Engineering, connectedTo, Air Cargo Logistics>
+<Aerospace Engineering, connectedTo, Aircraft Maintenance>
+<Aerospace Engineering, connectedTo, Airworthiness Certification>
+<Air Cargo Logistics, connectedTo, Airworthiness Certification>
+<Aircraft Maintenance, connectedTo, Emergency Procedures Training>
+<Airport Operations, assembles, Flight Simulation>
+<Airport Operations, connectedTo, Gate Assignment>
+<Airworthiness Certification, connectedTo, Aircraft Maintenance>
+<Airworthiness Certification, connectedTo, Airport Operations>
+<Airworthiness Certification, connectedTo, Emergency Procedures Training>
+<Airworthiness Certification, connectedTo, Engine Overhaul>
+<Crew Scheduling, connectedTo, In_flight Service>
+<Engine Overhaul, connectedTo, Fleet Management>
+<Fleet Management, connectedTo, Air Cargo Logistics>
+<Flight Simulation, connectedTo, Crew Scheduling>
+<Gate Assignment, connectedTo, Aircraft Maintenance>
+<Ground Support, connectedTo, Airport Operations>
+<In_flight Service, connectedTo, Ground Support>
+<Passenger Check_in, alerts, Aerospace Engineering>
+<Passenger Check_in, connectedTo, Airport Operations>
+<Passenger Check_in, connectedTo, Airworthiness Certification>
+<Passenger Check_in, connectedTo, Gate Assignment>
+<Passenger Check_in, monitors, Gate Assignment>
+<Regulatory Compliance, connectedTo, Gate Assignment>
+<Regulatory Compliance, connectedTo, Passenger Check_in>
diff --git a/test/diagrams/graph_hard/diagrams_153.txt b/test/diagrams/graph_hard/diagrams_153.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e0d86e1cad641edd9fd52847c41bebe7a04301f5
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_153.txt
@@ -0,0 +1,31 @@
+<Air Cargo Logistics, connectedTo, Weather Briefing>
+<Air Traffic Control, connectedTo, Airport Operations>
+<Air Traffic Control, connectedTo, Engine Overhaul>
+<Aircraft Maintenance, connectedTo, Emergency Procedures Training>
+<Aircraft Manufacturing, connectedTo, Air Cargo Logistics>
+<Aircraft Manufacturing, connectedTo, Engine Overhaul>
+<Airport Operations, connectedTo, Airspace Management>
+<Airspace Management, connectedTo, Fueling Operations>
+<Airworthiness Certification, connectedTo, Avionics Repair>
+<Avionics Repair, connectedTo, Engine Overhaul>
+<Avionics Repair, connectedTo, Navigation System Check>
+<Emergency Procedures Training, connectedTo, Avionics Repair>
+<Fueling Operations, connectedTo, Aircraft Maintenance>
+<Gate Assignment, investigates, Passenger Boarding>
+<In_flight Service, connectedTo, Security Screening>
+<Navigation System Check, connectedTo, Aircraft Manufacturing>
+<Navigation System Check, connectedTo, Engine Overhaul>
+<Navigation System Check, connectedTo, Weather Briefing>
+<Navigation System Check, tests, Weather Briefing>
+<Navigation System Check, trains, Air Cargo Logistics>
+<Passenger Boarding, navigates, Air Traffic Control>
+<Regulatory Compliance, boards, Airworthiness Certification>
+<Route Optimization, connectedTo, Sustainable Aviation Fuel Development>
+<Route Optimization, connectedTo, Weather Briefing>
+<Runway Management, connectedTo, Regulatory Compliance>
+<Security Screening, connectedTo, Aircraft Maintenance>
+<Security Screening, connectedTo, Runway Management>
+<Sustainable Aviation Fuel Development, connectedTo, In_flight Service>
+<Weather Briefing, connectedTo, Engine Overhaul>
+<Weather Briefing, connectedTo, Gate Assignment>
+<Weather Briefing, connectedTo, Passenger Boarding>
diff --git a/test/diagrams/graph_hard/diagrams_155.dot b/test/diagrams/graph_hard/diagrams_155.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e8a07b012953ce6e9e96ea7cfa3c5996e415d08e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_155.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=BT
+	N0 [label="Geofencing" color="#BCB88A" fillcolor="#F5F5DC" shape=rectangle style=filled]
+	N1 [label="Wearable Device Navigation" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N2 [label="Points of Interest Search" color="#BA68C8" fillcolor="#F3E5F5" shape=document style=filled]
+	N3 [label="Turn_by_Turn Directions" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N4 [label="GPS Positioning" color="#BA68C8" fillcolor="#F3E5F5" shape=inputoutput style=filled]
+	N5 [label="Navigation Data Update" color="#D2D2D2" fillcolor="#F0F0F0" shape=predefinedprocess style=filled]
+	N6 [label="Location_Based Services" color="#BA68C8" fillcolor="#F3E5F5" shape=inputoutput style=filled]
+	N7 [label="Celestial Navigation" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N8 [label="Autonomous Vehicle Navigation" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N9 [label="Personalized Route Preferences" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N10 [label="Real_Time Re_routing" color="#D2D2D2" fillcolor="#F0F0F0" shape=predefinedprocess style=filled]
+	N11 [label="Indoor Navigation" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#D2D2D2" fillcolor="#F0F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#D2D2D2" fillcolor="#F0F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Satellite Navigation Systems {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Satellite Navigation Systems"
+		nest0_0 [label="Map Display" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+		nest0_1 [label="Pedestrian Navigation" color="#BCB88A" fillcolor="#F5F5DC" shape=rectangle style=filled]
+	}
+	subgraph cluster_Geocoding {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Geocoding"
+		nest1_0 [label="Speed Calculation" color="#BCB88A" fillcolor="#F5F5DC" shape=rectangle style=filled]
+		nest1_1 [label="Offline Map Support" color="#BA68C8" fillcolor="#F3E5F5" shape=document style=filled]
+		nest1_2 [label="Voice Guidance Customization" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest0_0 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N5 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N5 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S1 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> S2 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	S2 -> N11 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N7 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M0 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_156.txt b/test/diagrams/graph_hard/diagrams_156.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4f634c90b9607559bcd1359a57e359fb3971640f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_156.txt
@@ -0,0 +1,28 @@
+<Augmented Reality Navigation, connectedTo, ETA Estimation>
+<Autonomous Vehicle Navigation, connectedTo, Real_Time Re_routing>
+<Bearing and Distance Calculation, connectedTo, Location_Based Services>
+<Dead Reckoning, connectedTo, Augmented Reality Navigation>
+<Dead Reckoning, connectedTo, Topographic Mapping>
+<Dead Reckoning, plans, Inertial Navigation System>
+<ETA Estimation, connectedTo, GPS Positioning>
+<ETA Estimation, connectedTo, Hazard Alerts>
+<ETA Estimation, connectedTo, Navigation Data Update>
+<ETA Estimation, connectedTo, Offline Map Support>
+<ETA Estimation, connectedTo, Waypoint Setting>
+<GPS Positioning, connectedTo, Navigation Data Update>
+<Geocoding, connectedTo, Public Transit Navigation>
+<Hazard Alerts, connectedTo, Navigation Data Update>
+<Hazard Alerts, connectedTo, Waypoint Setting>
+<Hazard Alerts, directs, GPS Positioning>
+<Inertial Navigation System, connectedTo, Speed Calculation>
+<Inertial Navigation System, connectedTo, Topographic Mapping>
+<Location_Based Services, connectedTo, Augmented Reality Navigation>
+<Location_Based Services, connectedTo, Autonomous Vehicle Navigation>
+<Navigation Data Update, connectedTo, Offline Map Support>
+<Public Transit Navigation, connectedTo, Bearing and Distance Calculation>
+<Real_Time Re_routing, connectedTo, ETA Estimation>
+<Speed Calculation, connectedTo, Augmented Reality Navigation>
+<Speed Calculation, connectedTo, Topographic Mapping>
+<Speed Calculation, maps, Geocoding>
+<Topographic Mapping, connectedTo, Location_Based Services>
+<Waypoint Setting, connectedTo, GPS Positioning>
diff --git a/test/diagrams/graph_hard/diagrams_157.dot b/test/diagrams/graph_hard/diagrams_157.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b2f83efc5f5b77a0c202b7ec66238bbaf68c130c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_157.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=RL
+	N0 [label="On_Demand Production" color="#AABEC6" fillcolor="#E0E6E9" shape=preparation style=filled]
+	N1 [label="Aerospace Part Production" color="#AABEC6" fillcolor="#E0E6E9" shape=vnode_shape style=filled]
+	N2 [label="Digital Twin for 3D Prints" color="#FFC085" fillcolor="#FFDAB9" shape=hexagon style=filled]
+	N3 [label="Support Structure Design" color="#AABEC6" fillcolor="#E0E6E9" shape=database style=filled]
+	N4 [label="Fused Deposition Modeling" color="#FFC085" fillcolor="#FFDAB9" shape=rect style=filled]
+	N5 [label="Rapid Manufacturing" color="#E91E63" fillcolor="#F8BBD0" shape=multipledocuments style=filled]
+	N6 [label="Sustainable 3D Printing Materials" color="#AABEC6" fillcolor="#E0E6E9" shape=predefinedprocess style=filled]
+	N7 [label="Printing Parameter Optimization" color="#FFC085" fillcolor="#FFDAB9" shape=parallelogram style=filled]
+	N8 [label="Additive Manufacturing" color="#FFC085" fillcolor="#FFDAB9" shape=preparation style=filled]
+	N9 [label="Food Printing" color="#AABEC6" fillcolor="#E0E6E9" shape=vnode_shape style=filled]
+	N10 [label="File Format Conversion" color="#FFC085" fillcolor="#FFDAB9" shape=hexagon style=filled]
+	N11 [label="Material Research and Development" color="#AABEC6" fillcolor="#E0E6E9" shape=rectangle style=filled]
+	S0 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#F8BBD0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Selective Laser Sintering {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Selective Laser Sintering"
+		nest0_0 [label="Intellectual Property Protection for Designs" color="#E91E63" fillcolor="#F8BBD0" shape=rectangle style=filled]
+		nest0_1 [label="Distributed Manufacturing" color="#FFC085" fillcolor="#FFDAB9" shape=predefinedprocess style=filled]
+		nest0_2 [label="3D Model Design" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	}
+	subgraph cluster_Direct Metal Laser Sintering {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Direct Metal Laser Sintering"
+		nest1_0 [label="Mass Customization" color="#AABEC6" fillcolor="#E0E6E9" shape=rect style=filled]
+		nest1_1 [label="Stereolithography" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+		nest1_2 [label="Reverse Engineering with 3D Printing" color="#AABEC6" fillcolor="#E0E6E9" shape=preparation style=filled]
+		nest1_3 [label="Scaffolding for Tissue Engineering" color="#FFC085" fillcolor="#FFDAB9" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed label="repairs" dir=forward]
+	N6 -> N7 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#AABEC6" penwidth=1.5 style=solid label="validates" dir=forward]
+	N10 -> N11 [color="#AABEC6" penwidth=1.5 style=dashed label="shares" dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#E91E63" penwidth=1.5 style=solid label="tests" dir=forward]
+	nest0_2 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#E91E63" penwidth=1.5 style=dashed label="materials" dir=forward]
+	nest1_1 -> nest1_2 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest1_0 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N6 [color="#FFC085" penwidth=1.5 style=dashed label="monitors" dir=forward]
+	N5 -> S0 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S2 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S2 -> N4 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	M0 -> N10 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	M1 -> N11 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_157.txt b/test/diagrams/graph_hard/diagrams_157.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0f974b65037d8e78f4ca0c8e40e6fb7af7522ca6
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_157.txt
@@ -0,0 +1,33 @@
+<3D Model Design, connectedTo, Rapid Manufacturing>
+<Additive Manufacturing, connectedTo, Food Printing>
+<Aerospace Part Production, connectedTo, Digital Twin for 3D Prints>
+<Aerospace Part Production, connectedTo, File Format Conversion>
+<Aerospace Part Production, connectedTo, Fused Deposition Modeling>
+<Aerospace Part Production, connectedTo, Sustainable 3D Printing Materials>
+<Digital Twin for 3D Prints, connectedTo, Material Research and Development>
+<Digital Twin for 3D Prints, connectedTo, Support Structure Design>
+<Distributed Manufacturing, connectedTo, 3D Model Design>
+<File Format Conversion, shares, Material Research and Development>
+<Food Printing, validates, File Format Conversion>
+<Fused Deposition Modeling, connectedTo, File Format Conversion>
+<Fused Deposition Modeling, connectedTo, Material Research and Development>
+<Fused Deposition Modeling, connectedTo, Rapid Manufacturing>
+<Intellectual Property Protection for Designs, connectedTo, Distributed Manufacturing>
+<Mass Customization, materials, Stereolithography>
+<On_Demand Production, connectedTo, Aerospace Part Production>
+<On_Demand Production, connectedTo, File Format Conversion>
+<On_Demand Production, connectedTo, Printing Parameter Optimization>
+<Printing Parameter Optimization, connectedTo, Additive Manufacturing>
+<Rapid Manufacturing, connectedTo, Additive Manufacturing>
+<Rapid Manufacturing, connectedTo, File Format Conversion>
+<Rapid Manufacturing, connectedTo, Printing Parameter Optimization>
+<Rapid Manufacturing, repairs, Sustainable 3D Printing Materials>
+<Reverse Engineering with 3D Printing, connectedTo, Scaffolding for Tissue Engineering>
+<Scaffolding for Tissue Engineering, monitors, Sustainable 3D Printing Materials>
+<Stereolithography, connectedTo, Reverse Engineering with 3D Printing>
+<Support Structure Design, connectedTo, Fused Deposition Modeling>
+<Support Structure Design, connectedTo, Mass Customization>
+<Support Structure Design, connectedTo, Material Research and Development>
+<Sustainable 3D Printing Materials, connectedTo, File Format Conversion>
+<Sustainable 3D Printing Materials, connectedTo, Printing Parameter Optimization>
+<Sustainable 3D Printing Materials, tests, Intellectual Property Protection for Designs>
diff --git a/test/diagrams/graph_hard/diagrams_158.dot b/test/diagrams/graph_hard/diagrams_158.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2e96b34d18c07b935b905fe119309f4e41c1a799
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_158.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=BT
+	N0 [label="Custom Part Production" color="#AED581" fillcolor="#F0F4C3" shape=preparation style=filled]
+	N1 [label="Maintenance and Repair of Printers" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+	N2 [label="Scaffolding for Tissue Engineering" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N3 [label="Sustainable 3D Printing Materials" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N4 [label="Additive Manufacturing" color="#AED581" fillcolor="#F0F4C3" shape=rectangle style=filled]
+	N5 [label="Selective Laser Sintering" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N6 [label="Printer Setup" color="#E91E63" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N7 [label="Prototyping" color="#F7BEE0" fillcolor="#FAEBF3" shape=inputoutput style=filled]
+	N8 [label="Slicing Software Operation" color="#E91E63" fillcolor="#FCE4EC" shape=rectangle style=filled]
+	N9 [label="Reverse Engineering with 3D Printing" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N10 [label="Educational Applications" color="#F7BEE0" fillcolor="#FAEBF3" shape=rectangle style=filled]
+	N11 [label="Material Research and Development" color="#F7BEE0" fillcolor="#FAEBF3" shape=vnode_shape style=filled]
+	N12 [label="Post_Processing" color="#F7BEE0" fillcolor="#FAEBF3" shape=multipledocuments style=filled]
+	N13 [label="Printing Process" color="#AED581" fillcolor="#F0F4C3" shape=rectangle style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#F7BEE0" fillcolor="#FAEBF3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Multi_Material Printing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Multi_Material Printing"
+		nest0_0 [label="Aerospace Part Production" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+		nest0_1 [label="Direct Metal Laser Sintering" color="#F7BEE0" fillcolor="#FAEBF3" shape=preparation style=filled]
+		nest0_2 [label="Consumer Product Creation" color="#AED581" fillcolor="#F0F4C3" shape=inputoutput style=filled]
+	}
+	subgraph cluster_3D Printed Tooling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="3D Printed Tooling"
+		nest1_0 [label="Printing Parameter Optimization" color="#AED581" fillcolor="#F0F4C3" shape=parallelogram style=filled]
+		nest1_1 [label="Troubleshooting Print Errors" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+		nest1_2 [label="Medical Device Prototyping" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#E91E63" penwidth=1.5 style=solid label="monitors" dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#AED581" penwidth=1.5 style=dashed label="processes" dir=forward]
+	N9 -> N10 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#F7BEE0" penwidth=1.5 style=solid label="develops" dir=forward]
+	N12 -> N13 [color="#AED581" penwidth=1.5 style=solid label="slices" dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> nest0_0 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N8 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> nest1_0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N10 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#AED581" penwidth=1.5 style=solid label="prototypes" dir=forward]
+	S0 -> N5 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S1 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N2 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M0 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	M0 -> N11 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#E91E63" penwidth=1.5 style=dashed label="integrates" dir=forward]
+	M1 -> N9 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_158.txt b/test/diagrams/graph_hard/diagrams_158.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ee74506f9cb4629f867f93d2735177ac9b083cf0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_158.txt
@@ -0,0 +1,34 @@
+<Additive Manufacturing, connectedTo, Selective Laser Sintering>
+<Aerospace Part Production, connectedTo, Direct Metal Laser Sintering>
+<Consumer Product Creation, connectedTo, Slicing Software Operation>
+<Custom Part Production, integrates, Reverse Engineering with 3D Printing>
+<Custom Part Production, monitors, Maintenance and Repair of Printers>
+<Direct Metal Laser Sintering, connectedTo, Consumer Product Creation>
+<Educational Applications, connectedTo, Material Research and Development>
+<Maintenance and Repair of Printers, connectedTo, Scaffolding for Tissue Engineering>
+<Material Research and Development, connectedTo, Printing Parameter Optimization>
+<Material Research and Development, develops, Post_Processing>
+<Medical Device Prototyping, connectedTo, Educational Applications>
+<Post_Processing, connectedTo, Aerospace Part Production>
+<Post_Processing, slices, Printing Process>
+<Printer Setup, connectedTo, Prototyping>
+<Printing Parameter Optimization, connectedTo, Troubleshooting Print Errors>
+<Prototyping, connectedTo, Material Research and Development>
+<Prototyping, connectedTo, Slicing Software Operation>
+<Reverse Engineering with 3D Printing, connectedTo, Educational Applications>
+<Scaffolding for Tissue Engineering, connectedTo, Additive Manufacturing>
+<Scaffolding for Tissue Engineering, connectedTo, Post_Processing>
+<Scaffolding for Tissue Engineering, connectedTo, Printer Setup>
+<Scaffolding for Tissue Engineering, connectedTo, Prototyping>
+<Scaffolding for Tissue Engineering, connectedTo, Slicing Software Operation>
+<Scaffolding for Tissue Engineering, connectedTo, Sustainable 3D Printing Materials>
+<Selective Laser Sintering, connectedTo, Material Research and Development>
+<Selective Laser Sintering, connectedTo, Printer Setup>
+<Selective Laser Sintering, connectedTo, Reverse Engineering with 3D Printing>
+<Slicing Software Operation, processes, Reverse Engineering with 3D Printing>
+<Sustainable 3D Printing Materials, connectedTo, Additive Manufacturing>
+<Sustainable 3D Printing Materials, connectedTo, Educational Applications>
+<Sustainable 3D Printing Materials, connectedTo, Selective Laser Sintering>
+<Sustainable 3D Printing Materials, connectedTo, Slicing Software Operation>
+<Sustainable 3D Printing Materials, prototypes, Post_Processing>
+<Troubleshooting Print Errors, connectedTo, Medical Device Prototyping>
diff --git a/test/diagrams/graph_hard/diagrams_159.dot b/test/diagrams/graph_hard/diagrams_159.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3c26aa53bdff1bb7e402d123f4896ff692048852
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_159.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=LR
+	N0 [label="Medical Device Prototyping" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N1 [label="Material Research and Development" color="#D2D2D2" fillcolor="#F0F0F0" shape=inputoutput style=filled]
+	N2 [label="3D Printed Tooling" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N3 [label="Digital Twin for 3D Prints" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+	N4 [label="Intellectual Property Protection for Designs" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N5 [label="4D Printing" color="#FFF8A6" fillcolor="#FFFDE0" shape=preparation style=filled]
+	N6 [label="Troubleshooting Print Errors" color="#FFF8A6" fillcolor="#FFFDE0" shape=action style=filled]
+	N7 [label="Fused Deposition Modeling" color="#FFDA4E" fillcolor="#FFE88D" shape=vnode_shape style=filled]
+	S0 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#D2D2D2" fillcolor="#F0F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Print Farm Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Print Farm Management"
+		nest0_0 [label="Slicing Software Operation" color="#FFF8A6" fillcolor="#FFFDE0" shape=vnode_shape style=filled]
+		nest0_1 [label="Bioprinting" color="#FFF8A6" fillcolor="#FFFDE0" shape=multipledocuments style=filled]
+		nest0_2 [label="File Format Conversion" color="#FFDA4E" fillcolor="#FFE88D" shape=inputoutput style=filled]
+		nest0_3 [label="Distributed Manufacturing" color="#FFDA4E" fillcolor="#FFE88D" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Support Structure Design {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Support Structure Design"
+		nest1_0 [label="Prototyping" color="#FFDA4E" fillcolor="#FFE88D" shape=diamond style=filled]
+		nest1_1 [label="Aerospace Part Production" color="#FFDA4E" fillcolor="#FFE88D" shape=rectangle style=filled]
+		nest1_2 [label="Maintenance and Repair of Printers" color="#FFDA4E" fillcolor="#FFE88D" shape=predefinedprocess style=filled]
+		nest1_3 [label="On_Demand Production" color="#FFF8A6" fillcolor="#FFFDE0" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest0_0 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S1 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#000000" penwidth=1.5 style=solid label="shares" dir=forward]
+	S1 -> N6 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N1 -> S2 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	S2 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N3 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	M0 -> N3 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	M2 -> N3 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_16.dot b/test/diagrams/graph_hard/diagrams_16.dot
new file mode 100644
index 0000000000000000000000000000000000000000..bf2d4186a437c009dfc1828215ccd0454eb6cd89
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_16.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=RL
+	N0 [label="Fare Calculation" color="#A1D7CD" fillcolor="#EDF5F3" shape=vnode_shape style=filled]
+	N1 [label="Schedule Generation" color="#A1D7CD" fillcolor="#EDF5F3" shape=vnode_shape style=filled]
+	N2 [label="Delay Alert" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+	N3 [label="Weather Impact Assessment" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N4 [label="Security Check" color="#A1D7CD" fillcolor="#EDF5F3" shape=rect style=filled]
+	N5 [label="Electric Vehicle Charging" color="#AED581" fillcolor="#F0F4C3" shape=predefinedprocess style=filled]
+	N6 [label="Route Optimization" color="#A188D0" fillcolor="#DACBE3" shape=database style=filled]
+	N7 [label="Maintenance Check" color="#AED581" fillcolor="#F0F4C3" shape=preparation style=filled]
+	N8 [label="Arrival" color="#A188D0" fillcolor="#DACBE3" shape=document style=filled]
+	N9 [label="Bridge Inspection" color="#A1D7CD" fillcolor="#EDF5F3" shape=rect style=filled]
+	N10 [label="Platform Assignment" color="#AED581" fillcolor="#F0F4C3" shape=database style=filled]
+	N11 [label="Road Network Management" color="#AED581" fillcolor="#F0F4C3" shape=multipledocuments style=filled]
+	N12 [label="Fueling" color="#AED581" fillcolor="#F0F4C3" shape=inputoutput style=filled]
+	N13 [label="Route Diversion" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N14 [label="Load Balancing" color="#A188D0" fillcolor="#DACBE3" shape=database style=filled]
+	N15 [label="Navigation Update" color="#A188D0" fillcolor="#DACBE3" shape=rect style=filled]
+	N16 [label="Tunnel Monitoring" color="#A188D0" fillcolor="#DACBE3" shape=vnode_shape style=filled]
+	S0 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Boarding {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Boarding"
+		nest0_0 [label="Emergency Landing" color="#A188D0" fillcolor="#DACBE3" shape=predefinedprocess style=filled]
+		nest0_1 [label="Train Dispatch" color="#AED581" fillcolor="#F0F4C3" shape=rectangle style=filled]
+	}
+	subgraph cluster_Ride_sharing Request {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Ride_sharing Request"
+		nest1_0 [label="Parking Management" color="#A1D7CD" fillcolor="#EDF5F3" shape=document style=filled]
+		nest1_1 [label="Bus Stop Management" color="#A188D0" fillcolor="#DACBE3" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed label="plans" dir=forward]
+	N7 -> N8 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#AED581" penwidth=1.5 style=solid label="surveys" dir=forward]
+	N3 -> nest0_0 [color="#AED581" penwidth=1.5 style=dashed label="manages" dir=forward]
+	nest0_1 -> N8 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N5 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N7 -> S0 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N12 -> S1 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N4 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=solid label="logs" dir=forward]
+	M1 -> N8 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_16.txt b/test/diagrams/graph_hard/diagrams_16.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f168c9fb706717c654770c1829bc624e7a3d913c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_16.txt
@@ -0,0 +1,33 @@
+<Arrival, connectedTo, Bridge Inspection>
+<Bridge Inspection, connectedTo, Platform Assignment>
+<Bus Stop Management, connectedTo, Electric Vehicle Charging>
+<Delay Alert, connectedTo, Arrival>
+<Delay Alert, connectedTo, Security Check>
+<Delay Alert, connectedTo, Weather Impact Assessment>
+<Electric Vehicle Charging, connectedTo, Route Optimization>
+<Emergency Landing, partOf, Emergency Landing>
+<Emergency Landing, surveys, Train Dispatch>
+<Fare Calculation, connectedTo, Schedule Generation>
+<Fare Calculation, connectedTo, Security Check>
+<Fueling, connectedTo, Navigation Update>
+<Fueling, connectedTo, Route Diversion>
+<Fueling, connectedTo, Tunnel Monitoring>
+<Load Balancing, connectedTo, Navigation Update>
+<Maintenance Check, connectedTo, Arrival>
+<Maintenance Check, connectedTo, Platform Assignment>
+<Maintenance Check, connectedTo, Route Diversion>
+<Navigation Update, connectedTo, Tunnel Monitoring>
+<Parking Management, connectedTo, Bus Stop Management>
+<Platform Assignment, connectedTo, Road Network Management>
+<Road Network Management, connectedTo, Fueling>
+<Route Diversion, connectedTo, Load Balancing>
+<Route Diversion, connectedTo, Parking Management>
+<Route Optimization, plans, Maintenance Check>
+<Schedule Generation, connectedTo, Delay Alert>
+<Schedule Generation, connectedTo, Security Check>
+<Security Check, connectedTo, Electric Vehicle Charging>
+<Train Dispatch, connectedTo, Arrival>
+<Train Dispatch, partOf, Train Dispatch>
+<Weather Impact Assessment, connectedTo, Security Check>
+<Weather Impact Assessment, logs, Arrival>
+<Weather Impact Assessment, manages, Emergency Landing>
diff --git a/test/diagrams/graph_hard/diagrams_160.txt b/test/diagrams/graph_hard/diagrams_160.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bbd63c6ef0135d1306020c9b3c2ef74a51020d0d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_160.txt
@@ -0,0 +1,36 @@
+<Atomic Force Microscopy, connectedTo, Energy Storage Applications>
+<Atomic Force Microscopy, converts, Public Perception of Nanotechnology>
+<Bio_Nanotechnology Interface, connectedTo, Atomic Force Microscopy>
+<Bio_Nanotechnology Interface, connectedTo, Energy Storage Applications>
+<Bio_Nanotechnology Interface, connectedTo, Nanosensors>
+<Bio_Nanotechnology Interface, detects, Public Perception of Nanotechnology>
+<Drug Delivery Systems, connectedTo, Nanoparticle Characterization>
+<Energy Storage Applications, connectedTo, Environmental Remediation with Nanomaterials>
+<Energy Storage Applications, connectedTo, Nanoscale Imaging>
+<Environmental Remediation with Nanomaterials, connectedTo, Nanosensors>
+<Ethical Implications of Nanotech, connectedTo, Environmental Remediation with Nanomaterials>
+<Ethical Implications of Nanotech, connectedTo, Water Purification using Nanomaterials>
+<Graphene Production, controls, Transmission Electron Microscopy>
+<Graphene Production, partOf, Graphene Production>
+<Lab_on_a_Chip Devices, commercializes, Energy Storage Applications>
+<Nanodevice Fabrication, connectedTo, Scanning Electron Microscopy>
+<Nanomaterial Synthesis, connectedTo, Environmental Remediation with Nanomaterials>
+<Nanomaterial Synthesis, connectedTo, Lab_on_a_Chip Devices>
+<Nanomaterial Synthesis, connectedTo, Nanosensors>
+<Nanomaterial Synthesis, connectedTo, Transmission Electron Microscopy>
+<Nanomaterial Synthesis, designs, Energy Storage Applications>
+<Nanoparticle Characterization, connectedTo, Nanodevice Fabrication>
+<Nanoscale Imaging, connectedTo, Drug Delivery Systems>
+<Nanoscale Imaging, connectedTo, Environmental Remediation with Nanomaterials>
+<Nanoscale Imaging, connectedTo, Photovoltaics>
+<Nanosensors, connectedTo, Spectroscopy>
+<Nanosensors, connectedTo, Transmission Electron Microscopy>
+<Photovoltaics, connectedTo, Environmental Remediation with Nanomaterials>
+<Public Perception of Nanotechnology, connectedTo, Environmental Remediation with Nanomaterials>
+<Public Perception of Nanotechnology, connectedTo, Nanomaterial Synthesis>
+<Public Perception of Nanotechnology, enhances, Energy Storage Applications>
+<Scanning Electron Microscopy, connectedTo, Photovoltaics>
+<Spectroscopy, connectedTo, Graphene Production>
+<Spectroscopy, partOf, Spectroscopy>
+<Water Purification using Nanomaterials, connectedTo, Bio_Nanotechnology Interface>
+<Water Purification using Nanomaterials, connectedTo, Energy Storage Applications>
diff --git a/test/diagrams/graph_hard/diagrams_161.dot b/test/diagrams/graph_hard/diagrams_161.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c1f59f99a2d1839c6343078add30aa2e03eb5c10
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_161.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=TB
+	N0 [label="Nanomaterial Synthesis" color="#6FE1D5" fillcolor="#C9EFEC" shape=parallelogram style=filled]
+	N1 [label="Nanocomposites" color="#FF5722" fillcolor="#FFCCBC" shape=inputoutput style=filled]
+	N2 [label="Bio_Nanotechnology Interface" color="#6FE1D5" fillcolor="#C9EFEC" shape=action style=filled]
+	N3 [label="Nanomedicine Development" color="#A2D0FF" fillcolor="#E8F0FF" shape=action style=filled]
+	N4 [label="Nanotoxicology" color="#FF5722" fillcolor="#FFCCBC" shape=document style=filled]
+	N5 [label="Nanodevice Fabrication" color="#6FE1D5" fillcolor="#C9EFEC" shape=rectangle style=filled]
+	N6 [label="Graphene Production" color="#FF5722" fillcolor="#FFCCBC" shape=inputoutput style=filled]
+	N7 [label="Risk Assessment of Nanomaterials" color="#6FE1D5" fillcolor="#C9EFEC" shape=rect style=filled]
+	N8 [label="Atomic Force Microscopy" color="#A2D0FF" fillcolor="#E8F0FF" shape=rectangle style=filled]
+	N9 [label="Water Purification using Nanomaterials" color="#6FE1D5" fillcolor="#C9EFEC" shape=action style=filled]
+	N10 [label="Public Perception of Nanotechnology" color="#FF5722" fillcolor="#FFCCBC" shape=document style=filled]
+	N11 [label="Regulatory Framework for Nanotech" color="#6FE1D5" fillcolor="#C9EFEC" shape=multipledocuments style=filled]
+	N12 [label="Surface Functionalization" color="#6FE1D5" fillcolor="#C9EFEC" shape=vnode_shape style=filled]
+	N13 [label="Nanocoatings" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+	N14 [label="Nanosensors" color="#FF5722" fillcolor="#FFCCBC" shape=preparation style=filled]
+	N15 [label="Spectroscopy" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N16 [label="Energy Storage Applications" color="#A2D0FF" fillcolor="#E8F0FF" shape=action style=filled]
+	S0 [label="" color="#FF5722" fillcolor="#FFCCBC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#A2D0FF" fillcolor="#E8F0FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FF5722" fillcolor="#FFCCBC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Nanoscale Imaging {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Nanoscale Imaging"
+		nest0_0 [label="Quantum Computing Integration" color="#FF5722" fillcolor="#FFCCBC" shape=inputoutput style=filled]
+		nest0_1 [label="Nanoelectronics" color="#6FE1D5" fillcolor="#C9EFEC" shape=rect style=filled]
+		nest0_2 [label="Catalysis at Nanoscale" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+	}
+	subgraph cluster_Molecular Self_Assembly {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Molecular Self_Assembly"
+		nest1_0 [label="Quantum Dots" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+		nest1_1 [label="Nanoparticle Characterization" color="#6FE1D5" fillcolor="#C9EFEC" shape=diamond style=filled]
+		nest1_2 [label="X_ray Diffraction" color="#A2D0FF" fillcolor="#E8F0FF" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed label="delivers" dir=forward]
+	N8 -> N9 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest0_0 [color="#A2D0FF" penwidth=1.5 style=dashed label="detects" dir=forward]
+	nest0_2 -> N7 [color="#6FE1D5" penwidth=1.5 style=dashed label="assembles" dir=forward]
+	nest1_0 -> nest1_1 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N9 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N13 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N16 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N7 -> S1 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#FF5722" penwidth=1.5 style=dashed label="functionalizes" dir=forward]
+	N0 -> M0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> M2 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N9 -> M2 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_161.txt b/test/diagrams/graph_hard/diagrams_161.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5a415c35b0eee4223754b23cadf66fcb05e2f99f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_161.txt
@@ -0,0 +1,32 @@
+<Atomic Force Microscopy, connectedTo, Water Purification using Nanomaterials>
+<Bio_Nanotechnology Interface, connectedTo, Nanomedicine Development>
+<Catalysis at Nanoscale, assembles, Risk Assessment of Nanomaterials>
+<Graphene Production, connectedTo, Risk Assessment of Nanomaterials>
+<Nanocoatings, connectedTo, Energy Storage Applications>
+<Nanocoatings, connectedTo, Nanosensors>
+<Nanocoatings, connectedTo, Spectroscopy>
+<Nanocoatings, detects, Quantum Computing Integration>
+<Nanocomposites, connectedTo, Bio_Nanotechnology Interface>
+<Nanocomposites, connectedTo, Quantum Dots>
+<Nanocomposites, functionalizes, Nanomedicine Development>
+<Nanodevice Fabrication, connectedTo, Graphene Production>
+<Nanoelectronics, connectedTo, Catalysis at Nanoscale>
+<Nanomaterial Synthesis, connectedTo, Nanocomposites>
+<Nanomaterial Synthesis, connectedTo, Nanomedicine Development>
+<Nanomedicine Development, connectedTo, Nanotoxicology>
+<Nanoparticle Characterization, connectedTo, X_ray Diffraction>
+<Nanosensors, connectedTo, Spectroscopy>
+<Nanotoxicology, connectedTo, Nanodevice Fabrication>
+<Public Perception of Nanotechnology, connectedTo, Regulatory Framework for Nanotech>
+<Quantum Computing Integration, connectedTo, Nanoelectronics>
+<Quantum Dots, connectedTo, Nanoparticle Characterization>
+<Regulatory Framework for Nanotech, connectedTo, Surface Functionalization>
+<Risk Assessment of Nanomaterials, connectedTo, Regulatory Framework for Nanotech>
+<Risk Assessment of Nanomaterials, connectedTo, Spectroscopy>
+<Risk Assessment of Nanomaterials, connectedTo, Water Purification using Nanomaterials>
+<Risk Assessment of Nanomaterials, delivers, Atomic Force Microscopy>
+<Spectroscopy, connectedTo, Energy Storage Applications>
+<Surface Functionalization, connectedTo, Nanocoatings>
+<Water Purification using Nanomaterials, connectedTo, Public Perception of Nanotechnology>
+<Water Purification using Nanomaterials, connectedTo, Spectroscopy>
+<X_ray Diffraction, connectedTo, Water Purification using Nanomaterials>
diff --git a/test/diagrams/graph_hard/diagrams_162.dot b/test/diagrams/graph_hard/diagrams_162.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ade018048320fdd77751a5bc621bf2448493f69a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_162.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=LR
+	N0 [label="Computational Nanotechnology" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N1 [label="Food Packaging Improvement" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N2 [label="Solar Cell Efficiency Enhancement" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N3 [label="Spintronics" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N4 [label="Water Purification using Nanomaterials" color="#8C9EFF" fillcolor="#D3D7EB" shape=vnode_shape style=filled]
+	N5 [label="Bio_Nanotechnology Interface" color="#E91E63" fillcolor="#F8BBD0" shape=preparation style=filled]
+	N6 [label="Graphene Production" color="#7E57C2" fillcolor="#EDE7F6" shape=predefinedprocess style=filled]
+	N7 [label="Ethical Implications of Nanotech" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N8 [label="Photovoltaics" color="#E91E63" fillcolor="#F8BBD0" shape=vnode_shape style=filled]
+	N9 [label="Nanosensors" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N10 [label="Lab_on_a_Chip Devices" color="#7E57C2" fillcolor="#EDE7F6" shape=database style=filled]
+	N11 [label="Risk Assessment of Nanomaterials" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N12 [label="X_ray Diffraction" color="#7E57C2" fillcolor="#EDE7F6" shape=rect style=filled]
+	N13 [label="Catalysis at Nanoscale" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N14 [label="Quantum Dots" color="#7E57C2" fillcolor="#EDE7F6" shape=document style=filled]
+	N15 [label="Surface Functionalization" color="#E91E63" fillcolor="#F8BBD0" shape=document style=filled]
+	N16 [label="Nanofabrication Techniques" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#F8BBD0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#7E57C2" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Nanomaterial Synthesis {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Nanomaterial Synthesis"
+		nest0_0 [label="Quantum Computing Integration" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest0_1 [label="Spectroscopy" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	}
+	subgraph cluster_Nanoscale Imaging {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Nanoscale Imaging"
+		nest1_0 [label="Nanodevice Fabrication" color="#8C9EFF" fillcolor="#D3D7EB" shape=preparation style=filled]
+		nest1_1 [label="Nanomedicine Development" color="#E91E63" fillcolor="#F8BBD0" shape=parallelogram style=filled]
+		nest1_2 [label="Nanocomposites" color="#7E57C2" fillcolor="#EDE7F6" shape=diamond style=filled]
+		nest1_3 [label="Atomic Force Microscopy" color="#E91E63" fillcolor="#F8BBD0" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#7E57C2" penwidth=1.5 style=solid label="analyzes" dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#E91E63" penwidth=1.5 style=solid label="visualizes" dir=forward]
+	N8 -> N9 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#E91E63" penwidth=1.5 style=dashed label="integrates" dir=forward]
+	N11 -> N12 [color="#8C9EFF" penwidth=1.5 style=dashed label="modifies" dir=forward]
+	N12 -> N13 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#8C9EFF" penwidth=1.5 style=dashed label="commercializes" dir=forward]
+	N14 -> nest0_0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> S0 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N16 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=solid label="designs" dir=forward]
+	S1 -> N9 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N12 -> S2 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N16 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N14 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N4 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N11 -> M1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N16 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_162.txt b/test/diagrams/graph_hard/diagrams_162.txt
new file mode 100644
index 0000000000000000000000000000000000000000..81dd39bdb2cfb4bdd597ca59a24ce4ddc0e146df
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_162.txt
@@ -0,0 +1,35 @@
+<Atomic Force Microscopy, connectedTo, Spintronics>
+<Bio_Nanotechnology Interface, analyzes, Graphene Production>
+<Bio_Nanotechnology Interface, connectedTo, Nanosensors>
+<Bio_Nanotechnology Interface, designs, Risk Assessment of Nanomaterials>
+<Catalysis at Nanoscale, connectedTo, Quantum Dots>
+<Computational Nanotechnology, connectedTo, Food Packaging Improvement>
+<Computational Nanotechnology, connectedTo, Nanofabrication Techniques>
+<Ethical Implications of Nanotech, visualizes, Photovoltaics>
+<Food Packaging Improvement, connectedTo, Solar Cell Efficiency Enhancement>
+<Food Packaging Improvement, connectedTo, Water Purification using Nanomaterials>
+<Graphene Production, connectedTo, Ethical Implications of Nanotech>
+<Lab_on_a_Chip Devices, connectedTo, Catalysis at Nanoscale>
+<Lab_on_a_Chip Devices, connectedTo, Nanofabrication Techniques>
+<Lab_on_a_Chip Devices, integrates, Risk Assessment of Nanomaterials>
+<Nanocomposites, connectedTo, Atomic Force Microscopy>
+<Nanodevice Fabrication, connectedTo, Nanomedicine Development>
+<Nanomedicine Development, connectedTo, Nanocomposites>
+<Nanosensors, connectedTo, Lab_on_a_Chip Devices>
+<Photovoltaics, connectedTo, Nanosensors>
+<Quantum Computing Integration, commercializes, Spectroscopy>
+<Quantum Dots, connectedTo, Quantum Computing Integration>
+<Quantum Dots, connectedTo, Surface Functionalization>
+<Risk Assessment of Nanomaterials, connectedTo, Nanofabrication Techniques>
+<Risk Assessment of Nanomaterials, modifies, X_ray Diffraction>
+<Solar Cell Efficiency Enhancement, connectedTo, Spintronics>
+<Solar Cell Efficiency Enhancement, connectedTo, Water Purification using Nanomaterials>
+<Spectroscopy, connectedTo, Food Packaging Improvement>
+<Spintronics, connectedTo, Nanodevice Fabrication>
+<Spintronics, connectedTo, Water Purification using Nanomaterials>
+<Surface Functionalization, connectedTo, Nanofabrication Techniques>
+<Water Purification using Nanomaterials, connectedTo, Bio_Nanotechnology Interface>
+<X_ray Diffraction, connectedTo, Catalysis at Nanoscale>
+<X_ray Diffraction, connectedTo, Nanofabrication Techniques>
+<X_ray Diffraction, connectedTo, Quantum Dots>
+<X_ray Diffraction, connectedTo, Surface Functionalization>
diff --git a/test/diagrams/graph_hard/diagrams_163.dot b/test/diagrams/graph_hard/diagrams_163.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5b965b7a39644d08753bbf5ef607489e2471bd37
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_163.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=TB
+	N0 [label="Quantum Software Development Kit" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Quantum Machine Learning" color="#00BCD4" fillcolor="#B2EBF2" shape=predefinedprocess style=filled]
+	N2 [label="Quantum Cloud Computing Services" color="#00BCD4" fillcolor="#B2EBF2" shape=inputoutput style=filled]
+	N3 [label="Material Science Simulations" color="#7E57C2" fillcolor="#D1C4E9" shape=rect style=filled]
+	N4 [label="Microwave Control for Qubits" color="#00BCD4" fillcolor="#B2EBF2" shape=action style=filled]
+	N5 [label="Quantum Simulation" color="#FF5722" fillcolor="#FFCCBC" shape=predefinedprocess style=filled]
+	N6 [label="Quantum Sensing" color="#7E57C2" fillcolor="#D1C4E9" shape=vnode_shape style=filled]
+	N7 [label="Post_Quantum Cryptography" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	S0 [label="" color="#FF5722" fillcolor="#FFCCBC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FF5722" fillcolor="#FFCCBC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Cryogenic Systems for Qubits {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Cryogenic Systems for Qubits"
+		nest0_0 [label="Financial Modeling with Quantum Computing" color="#00BCD4" fillcolor="#B2EBF2" shape=database style=filled]
+		nest0_1 [label="Superconducting Qubits" color="#FF5722" fillcolor="#FFCCBC" shape=inputoutput style=filled]
+		nest0_2 [label="Quantum Supremacy Claims" color="#7E57C2" fillcolor="#D1C4E9" shape=document style=filled]
+		nest0_3 [label="Quantum Error Correction" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	}
+	subgraph cluster_Decoherence Mitigation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Decoherence Mitigation"
+		nest1_0 [label="Quantum Computing in Drug Discovery" color="#7E57C2" fillcolor="#D1C4E9" shape=predefinedprocess style=filled]
+		nest1_1 [label="Quantum Hardware Control" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+		nest1_2 [label="Quantum Programming Languages" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N3 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N5 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S0 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N4 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	M2 -> N3 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_164.dot b/test/diagrams/graph_hard/diagrams_164.dot
new file mode 100644
index 0000000000000000000000000000000000000000..969066df18065389e421439f34aef630bc6edf77
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_164.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=TB
+	N0 [label="Quantum Supremacy Claims" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+	N1 [label="Quantum Network Development" color="#E91E63" fillcolor="#F8BBD0" shape=parallelogram style=filled]
+	N2 [label="Decoherence Mitigation" color="#D3EB9F" fillcolor="#F8FDD3" shape=multipledocuments style=filled]
+	N3 [label="Quantum Entanglement Generation" color="#CB9BE1" fillcolor="#F2E6F5" shape=database style=filled]
+	N4 [label="Quantum Advantage Demonstration" color="#E91E63" fillcolor="#F8BBD0" shape=rect style=filled]
+	N5 [label="Quantum Key Distribution" color="#E91E63" fillcolor="#F8BBD0" shape=document style=filled]
+	N6 [label="Financial Modeling with Quantum Computing" color="#E91E63" fillcolor="#F8BBD0" shape=rectangle style=filled]
+	N7 [label="Quantum Computing Education" color="#E91E63" fillcolor="#F8BBD0" shape=vnode_shape style=filled]
+	N8 [label="Quantum Bit Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=inputoutput style=filled]
+	N9 [label="Quantum Programming Languages" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N10 [label="Quantum Circuit Design" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N11 [label="Trapped Ion Qubits" color="#D3EB9F" fillcolor="#F8FDD3" shape=action style=filled]
+	N12 [label="Quantum Hardware Control" color="#CB9BE1" fillcolor="#F2E6F5" shape=rectangle style=filled]
+	N13 [label="Quantum Teleportation Research" color="#CB9BE1" fillcolor="#F2E6F5" shape=database style=filled]
+	N14 [label="Quantum Annealing" color="#E91E63" fillcolor="#F8BBD0" shape=parallelogram style=filled]
+	N15 [label="Quantum Cloud Computing Services" color="#CB9BE1" fillcolor="#F2E6F5" shape=document style=filled]
+	N16 [label="Superconducting Qubits" color="#D3EB9F" fillcolor="#F8FDD3" shape=predefinedprocess style=filled]
+	S0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Quantum Software Development Kit {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Quantum Software Development Kit"
+		nest0_0 [label="Quantum Simulation" color="#CB9BE1" fillcolor="#F2E6F5" shape=predefinedprocess style=filled]
+		nest0_1 [label="Material Science Simulations" color="#CB9BE1" fillcolor="#F2E6F5" shape=diamond style=filled]
+	}
+	subgraph cluster_Quantum Algorithm Development {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Quantum Algorithm Development"
+		nest1_0 [label="Quantum Machine Learning" color="#E91E63" fillcolor="#F8BBD0" shape=predefinedprocess style=filled]
+		nest1_1 [label="Post_Quantum Cryptography" color="#E91E63" fillcolor="#F8BBD0" shape=multipledocuments style=filled]
+		nest1_2 [label="Microwave Control for Qubits" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+		nest1_3 [label="Topological Qubits" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	}
+	N0 -> N1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#D3EB9F" penwidth=1.5 style=dashed label="downloads" dir=forward]
+	N4 -> N5 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#E91E63" penwidth=1.5 style=dashed label="debugs" dir=forward]
+	N11 -> N12 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#D3EB9F" penwidth=1.5 style=solid label="factors" dir=forward]
+	N15 -> N16 [color="#E91E63" penwidth=1.5 style=solid label="validates" dir=forward]
+	nest0_0 -> nest0_1 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N15 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N4 [color="#E91E63" penwidth=1.5 style=solid label="solves" dir=forward]
+	nest1_0 -> nest1_1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N3 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N16 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#E91E63" penwidth=1.5 style=dashed label="processes" dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> M2 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N11 -> M2 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N16 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_164.txt b/test/diagrams/graph_hard/diagrams_164.txt
new file mode 100644
index 0000000000000000000000000000000000000000..094696f2fd9da2a7661d29983f84a3bd05f4030a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_164.txt
@@ -0,0 +1,36 @@
+<Decoherence Mitigation, connectedTo, Financial Modeling with Quantum Computing>
+<Decoherence Mitigation, connectedTo, Quantum Cloud Computing Services>
+<Decoherence Mitigation, connectedTo, Quantum Entanglement Generation>
+<Decoherence Mitigation, connectedTo, Quantum Hardware Control>
+<Decoherence Mitigation, connectedTo, Quantum Teleportation Research>
+<Financial Modeling with Quantum Computing, connectedTo, Quantum Computing Education>
+<Material Science Simulations, solves, Quantum Advantage Demonstration>
+<Microwave Control for Qubits, connectedTo, Topological Qubits>
+<Post_Quantum Cryptography, connectedTo, Microwave Control for Qubits>
+<Quantum Advantage Demonstration, connectedTo, Quantum Key Distribution>
+<Quantum Annealing, factors, Quantum Cloud Computing Services>
+<Quantum Bit Design, connectedTo, Quantum Programming Languages>
+<Quantum Bit Design, connectedTo, Superconducting Qubits>
+<Quantum Circuit Design, debugs, Trapped Ion Qubits>
+<Quantum Cloud Computing Services, connectedTo, Quantum Simulation>
+<Quantum Cloud Computing Services, validates, Superconducting Qubits>
+<Quantum Computing Education, connectedTo, Quantum Bit Design>
+<Quantum Entanglement Generation, connectedTo, Financial Modeling with Quantum Computing>
+<Quantum Entanglement Generation, downloads, Quantum Advantage Demonstration>
+<Quantum Hardware Control, connectedTo, Quantum Teleportation Research>
+<Quantum Key Distribution, connectedTo, Financial Modeling with Quantum Computing>
+<Quantum Key Distribution, connectedTo, Quantum Cloud Computing Services>
+<Quantum Key Distribution, connectedTo, Quantum Machine Learning>
+<Quantum Key Distribution, connectedTo, Superconducting Qubits>
+<Quantum Machine Learning, connectedTo, Post_Quantum Cryptography>
+<Quantum Network Development, connectedTo, Decoherence Mitigation>
+<Quantum Network Development, connectedTo, Financial Modeling with Quantum Computing>
+<Quantum Programming Languages, connectedTo, Quantum Circuit Design>
+<Quantum Simulation, connectedTo, Material Science Simulations>
+<Quantum Supremacy Claims, connectedTo, Financial Modeling with Quantum Computing>
+<Quantum Supremacy Claims, connectedTo, Quantum Network Development>
+<Quantum Supremacy Claims, processes, Financial Modeling with Quantum Computing>
+<Quantum Teleportation Research, connectedTo, Quantum Annealing>
+<Topological Qubits, connectedTo, Quantum Entanglement Generation>
+<Trapped Ion Qubits, connectedTo, Quantum Hardware Control>
+<Trapped Ion Qubits, connectedTo, Superconducting Qubits>
diff --git a/test/diagrams/graph_hard/diagrams_165.dot b/test/diagrams/graph_hard/diagrams_165.dot
new file mode 100644
index 0000000000000000000000000000000000000000..23aa96eb07b020c637759f3ac8fa6ad2baeee08a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_165.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=LR
+	N0 [label="Quantum Teleportation Research" color="#FFF9AE" fillcolor="#FFFCE6" shape=inputoutput style=filled]
+	N1 [label="Quantum Key Distribution" color="#FBC02D" fillcolor="#FFFDE7" shape=preparation style=filled]
+	N2 [label="Quantum Error Correction" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N3 [label="Quantum Computing in Drug Discovery" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N4 [label="Quantum Network Development" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+	N5 [label="Trapped Ion Qubits" color="#CB9BE1" fillcolor="#F2E6F5" shape=document style=filled]
+	N6 [label="Quantum Computing for AI" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N7 [label="Quantum Circuit Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=rectangle style=filled]
+	N8 [label="Quantum Coherence Management" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N9 [label="Quantum Supremacy Claims" color="#FBC02D" fillcolor="#FFFDE7" shape=multipledocuments style=filled]
+	N10 [label="Quantum Advantage Demonstration" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	S0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FBC02D" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Quantum Computing Benchmarking {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Quantum Computing Benchmarking"
+		nest0_0 [label="Financial Modeling with Quantum Computing" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+		nest0_1 [label="Quantum Computing Education" color="#CB9BE1" fillcolor="#F2E6F5" shape=preparation style=filled]
+		nest0_2 [label="Quantum Annealing" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_3 [label="Quantum Cryptography" color="#FFF9AE" fillcolor="#FFFCE6" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Decoherence Mitigation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Decoherence Mitigation"
+		nest1_0 [label="Quantum Entanglement Generation" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest1_1 [label="Quantum Hardware Control" color="#CB9BE1" fillcolor="#F2E6F5" shape=document style=filled]
+		nest1_2 [label="Post_Quantum Cryptography" color="#CB9BE1" fillcolor="#F2E6F5" shape=database style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest0_0 [color="#CB9BE1" penwidth=1.5 style=dashed label="secures" dir=forward]
+	nest0_3 -> N3 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest1_0 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N2 [color="#000000" penwidth=1.5 style=dashed label="models" dir=forward]
+	N1 -> S0 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#FFF9AE" penwidth=1.5 style=solid label="tests" dir=forward]
+	S0 -> N7 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N0 -> S1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#FFF9AE" penwidth=1.5 style=solid label="measures" dir=forward]
+	N6 -> M0 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	M0 -> N10 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#FBC02D" penwidth=1.5 style=dashed label="verifies" dir=forward]
+	N0 -> M1 [color="#FBC02D" penwidth=1.5 style=dashed label="educates" dir=forward]
+	M1 -> N3 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#FFF9AE" penwidth=1.5 style=solid label="decrypts" dir=forward]
+	N1 -> M2 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N4 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_165.txt b/test/diagrams/graph_hard/diagrams_165.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ae8c4e411ffea3e79de0a361fe929c7a684f6e72
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_165.txt
@@ -0,0 +1,30 @@
+<Financial Modeling with Quantum Computing, connectedTo, Quantum Computing Education>
+<Post_Quantum Cryptography, models, Quantum Error Correction>
+<Quantum Annealing, connectedTo, Quantum Cryptography>
+<Quantum Circuit Design, connectedTo, Quantum Coherence Management>
+<Quantum Circuit Design, secures, Financial Modeling with Quantum Computing>
+<Quantum Coherence Management, connectedTo, Quantum Supremacy Claims>
+<Quantum Computing Education, connectedTo, Quantum Annealing>
+<Quantum Computing for AI, connectedTo, Quantum Advantage Demonstration>
+<Quantum Computing for AI, connectedTo, Quantum Circuit Design>
+<Quantum Computing in Drug Discovery, connectedTo, Quantum Network Development>
+<Quantum Cryptography, connectedTo, Quantum Computing in Drug Discovery>
+<Quantum Entanglement Generation, connectedTo, Quantum Hardware Control>
+<Quantum Error Correction, connectedTo, Quantum Computing in Drug Discovery>
+<Quantum Hardware Control, connectedTo, Post_Quantum Cryptography>
+<Quantum Key Distribution, connectedTo, Quantum Circuit Design>
+<Quantum Key Distribution, connectedTo, Quantum Error Correction>
+<Quantum Key Distribution, connectedTo, Quantum Network Development>
+<Quantum Key Distribution, tests, Quantum Advantage Demonstration>
+<Quantum Key Distribution, verifies, Quantum Computing in Drug Discovery>
+<Quantum Network Development, connectedTo, Trapped Ion Qubits>
+<Quantum Network Development, measures, Quantum Advantage Demonstration>
+<Quantum Supremacy Claims, connectedTo, Quantum Advantage Demonstration>
+<Quantum Teleportation Research, connectedTo, Quantum Advantage Demonstration>
+<Quantum Teleportation Research, connectedTo, Quantum Key Distribution>
+<Quantum Teleportation Research, connectedTo, Quantum Network Development>
+<Quantum Teleportation Research, connectedTo, Trapped Ion Qubits>
+<Quantum Teleportation Research, decrypts, Quantum Network Development>
+<Quantum Teleportation Research, educates, Quantum Computing in Drug Discovery>
+<Trapped Ion Qubits, connectedTo, Quantum Computing for AI>
+<Trapped Ion Qubits, connectedTo, Quantum Entanglement Generation>
diff --git a/test/diagrams/graph_hard/diagrams_166.dot b/test/diagrams/graph_hard/diagrams_166.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5ccb0b45e8f1c91b0252335e3c056e8830aa4bc0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_166.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=LR
+	N0 [label="Live Event Streaming in VR" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N1 [label="Virtual Showrooms" color="#9575CD" fillcolor="#EDE7F6" shape=vnode_shape style=filled]
+	N2 [label="Cloud_based AR or VR Rendering" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N3 [label="Performance Optimization" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+	N4 [label="AR for Navigation" color="#AED581" fillcolor="#F0F4C3" shape=rectangle style=filled]
+	N5 [label="Data Visualization in AR or VR" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+	N6 [label="Immersive Storytelling" color="#9575CD" fillcolor="#EDE7F6" shape=preparation style=filled]
+	N7 [label="Medical Applications" color="#9575CD" fillcolor="#EDE7F6" shape=multipledocuments style=filled]
+	N8 [label="Eye Tracking" color="#AED581" fillcolor="#F0F4C3" shape=rect style=filled]
+	N9 [label="Hand Tracking and Interaction" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N10 [label="Comfort and Ergonomics Design" color="#9575CD" fillcolor="#EDE7F6" shape=action style=filled]
+	N11 [label="Virtual Tourism Experiences" color="#607D8B" fillcolor="#CFD8DC" shape=rectangle style=filled]
+	N12 [label="Training Simulations" color="#AED581" fillcolor="#F0F4C3" shape=database style=filled]
+	N13 [label="Neuro_VR Interfaces" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	S0 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#607D8B" fillcolor="#CFD8DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#607D8B" fillcolor="#CFD8DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#607D8B" fillcolor="#CFD8DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Virtual Reality Game Development {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Virtual Reality Game Development"
+		nest0_0 [label="Spatial Audio Implementation" color="#AED581" fillcolor="#F0F4C3" shape=multipledocuments style=filled]
+		nest0_1 [label="Wearable AR Devices" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+		nest0_2 [label="Latency Reduction" color="#AED581" fillcolor="#F0F4C3" shape=vnode_shape style=filled]
+		nest0_3 [label="Educational Content Development" color="#AED581" fillcolor="#F0F4C3" shape=preparation style=filled]
+	}
+	subgraph cluster_Multiplayer Experience Design {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Multiplayer Experience Design"
+		nest1_0 [label="Gesture Recognition" color="#607D8B" fillcolor="#CFD8DC" shape=document style=filled]
+		nest1_1 [label="Mixed Reality Solutions" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+		nest1_2 [label="Retail Experience Enhancement" color="#AED581" fillcolor="#F0F4C3" shape=inputoutput style=filled]
+		nest1_3 [label="Software Development Kit Integration" color="#9575CD" fillcolor="#EDE7F6" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#AED581" penwidth=1.5 style=solid label="processes" dir=forward]
+	N1 -> N2 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#AED581" penwidth=1.5 style=dashed label="personalizes" dir=forward]
+	N3 -> N4 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N13 [color="#000000" penwidth=1.5 style=dashed label="collaborates" dir=forward]
+	N8 -> S0 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_166.txt b/test/diagrams/graph_hard/diagrams_166.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9b8d9fc8d997bc60087380196a0991609ac3a658
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_166.txt
@@ -0,0 +1,32 @@
+<AR for Navigation, connectedTo, Data Visualization in AR or VR>
+<AR for Navigation, connectedTo, Gesture Recognition>
+<Cloud_based AR or VR Rendering, connectedTo, Eye Tracking>
+<Cloud_based AR or VR Rendering, personalizes, Performance Optimization>
+<Comfort and Ergonomics Design, connectedTo, Virtual Tourism Experiences>
+<Data Visualization in AR or VR, connectedTo, Immersive Storytelling>
+<Educational Content Development, connectedTo, Virtual Tourism Experiences>
+<Eye Tracking, connectedTo, Hand Tracking and Interaction>
+<Eye Tracking, connectedTo, Training Simulations>
+<Eye Tracking, connectedTo, Virtual Tourism Experiences>
+<Gesture Recognition, connectedTo, Mixed Reality Solutions>
+<Hand Tracking and Interaction, connectedTo, Comfort and Ergonomics Design>
+<Immersive Storytelling, connectedTo, Medical Applications>
+<Latency Reduction, connectedTo, Educational Content Development>
+<Live Event Streaming in VR, connectedTo, Eye Tracking>
+<Live Event Streaming in VR, processes, Virtual Showrooms>
+<Medical Applications, connectedTo, Eye Tracking>
+<Medical Applications, connectedTo, Hand Tracking and Interaction>
+<Mixed Reality Solutions, connectedTo, Retail Experience Enhancement>
+<Performance Optimization, connectedTo, AR for Navigation>
+<Performance Optimization, connectedTo, Hand Tracking and Interaction>
+<Performance Optimization, connectedTo, Spatial Audio Implementation>
+<Retail Experience Enhancement, connectedTo, Software Development Kit Integration>
+<Software Development Kit Integration, collaborates, Neuro_VR Interfaces>
+<Spatial Audio Implementation, connectedTo, Wearable AR Devices>
+<Training Simulations, connectedTo, Neuro_VR Interfaces>
+<Virtual Showrooms, connectedTo, AR for Navigation>
+<Virtual Showrooms, connectedTo, Cloud_based AR or VR Rendering>
+<Virtual Showrooms, connectedTo, Eye Tracking>
+<Virtual Showrooms, connectedTo, Medical Applications>
+<Virtual Tourism Experiences, connectedTo, Training Simulations>
+<Wearable AR Devices, connectedTo, Latency Reduction>
diff --git a/test/diagrams/graph_hard/diagrams_167.dot b/test/diagrams/graph_hard/diagrams_167.dot
new file mode 100644
index 0000000000000000000000000000000000000000..25f236a36743adce79ec8693f2ff4d6e3258be5d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_167.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=RL
+	N0 [label="Latency Reduction" color="#FFA726" fillcolor="#FFF3E0" shape=database style=filled]
+	N1 [label="User Interface Design" color="#DCE775" fillcolor="#F9FBE7" shape=diamond style=filled]
+	N2 [label="Remote Collaboration Tools" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N3 [label="AR for Navigation" color="#DCE775" fillcolor="#F9FBE7" shape=rectangle style=filled]
+	N4 [label="Spatial Audio Implementation" color="#FFA726" fillcolor="#FFF3E0" shape=multipledocuments style=filled]
+	N5 [label="Headset Development" color="#DCE775" fillcolor="#F9FBE7" shape=vnode_shape style=filled]
+	N6 [label="Haptic Feedback Integration" color="#DCE775" fillcolor="#F9FBE7" shape=action style=filled]
+	N7 [label="Tracking System Calibration" color="#DCE775" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	N8 [label="Live Event Streaming in VR" color="#DCE775" fillcolor="#F9FBE7" shape=preparation style=filled]
+	N9 [label="Hardware Prototyping" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N10 [label="Eye Tracking" color="#FFA726" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N11 [label="Ethical Considerations in AR or VR" color="#DCE775" fillcolor="#F9FBE7" shape=action style=filled]
+	N12 [label="Performance Optimization" color="#4FC3F7" fillcolor="#E1F5FE" shape=vnode_shape style=filled]
+	N13 [label="Content Creation for AR or VR" color="#FFA726" fillcolor="#FFF3E0" shape=inputoutput style=filled]
+	N14 [label="Neuro_VR Interfaces" color="#DCE775" fillcolor="#F9FBE7" shape=preparation style=filled]
+	S0 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4FC3F7" fillcolor="#E1F5FE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#4FC3F7" fillcolor="#E1F5FE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#4FC3F7" fillcolor="#E1F5FE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#4FC3F7" fillcolor="#E1F5FE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Immersive Storytelling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Immersive Storytelling"
+		nest0_0 [label="Environment Mapping" color="#4FC3F7" fillcolor="#E1F5FE" shape=document style=filled]
+		nest0_1 [label="Comfort and Ergonomics Design" color="#DCE775" fillcolor="#F9FBE7" shape=database style=filled]
+		nest0_2 [label="Training Simulations" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+		nest0_3 [label="Medical Applications" color="#FFA726" fillcolor="#FFF3E0" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Virtual Tourism Experiences {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Virtual Tourism Experiences"
+		nest1_0 [label="Multiplayer Experience Design" color="#FFA726" fillcolor="#FFF3E0" shape=preparation style=filled]
+		nest1_1 [label="Virtual Reality Game Development" color="#DCE775" fillcolor="#F9FBE7" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed label="builds" dir=forward]
+	N1 -> N2 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#4FC3F7" penwidth=1.5 style=dashed label="generates" dir=forward]
+	N3 -> N4 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#4FC3F7" penwidth=1.5 style=solid label="integrates" dir=forward]
+	N8 -> N9 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#4FC3F7" penwidth=1.5 style=solid label="educates" dir=forward]
+	N12 -> N13 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N13 -> nest0_0 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N7 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	N5 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N7 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N8 -> M0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N11 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#FFA726" penwidth=1.5 style=dashed label="interacts" dir=forward]
+	M1 -> N6 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_167.txt b/test/diagrams/graph_hard/diagrams_167.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ae01c52e05f440b641bd18c874e0171d9d61ea7f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_167.txt
@@ -0,0 +1,37 @@
+<AR for Navigation, connectedTo, Spatial Audio Implementation>
+<AR for Navigation, interacts, Haptic Feedback Integration>
+<Comfort and Ergonomics Design, connectedTo, Training Simulations>
+<Content Creation for AR or VR, connectedTo, Environment Mapping>
+<Content Creation for AR or VR, connectedTo, Neuro_VR Interfaces>
+<Environment Mapping, connectedTo, Comfort and Ergonomics Design>
+<Ethical Considerations in AR or VR, educates, Performance Optimization>
+<Eye Tracking, connectedTo, Ethical Considerations in AR or VR>
+<Haptic Feedback Integration, connectedTo, Tracking System Calibration>
+<Hardware Prototyping, connectedTo, Eye Tracking>
+<Headset Development, connectedTo, Ethical Considerations in AR or VR>
+<Headset Development, connectedTo, Haptic Feedback Integration>
+<Headset Development, connectedTo, Multiplayer Experience Design>
+<Headset Development, connectedTo, Tracking System Calibration>
+<Latency Reduction, builds, User Interface Design>
+<Latency Reduction, connectedTo, Ethical Considerations in AR or VR>
+<Live Event Streaming in VR, connectedTo, Ethical Considerations in AR or VR>
+<Live Event Streaming in VR, connectedTo, Hardware Prototyping>
+<Medical Applications, connectedTo, Remote Collaboration Tools>
+<Multiplayer Experience Design, connectedTo, Virtual Reality Game Development>
+<Performance Optimization, connectedTo, Content Creation for AR or VR>
+<Remote Collaboration Tools, connectedTo, Ethical Considerations in AR or VR>
+<Remote Collaboration Tools, connectedTo, Eye Tracking>
+<Remote Collaboration Tools, connectedTo, Haptic Feedback Integration>
+<Remote Collaboration Tools, connectedTo, Hardware Prototyping>
+<Remote Collaboration Tools, connectedTo, Headset Development>
+<Remote Collaboration Tools, connectedTo, Performance Optimization>
+<Remote Collaboration Tools, generates, AR for Navigation>
+<Spatial Audio Implementation, connectedTo, Headset Development>
+<Tracking System Calibration, connectedTo, Eye Tracking>
+<Tracking System Calibration, connectedTo, Neuro_VR Interfaces>
+<Tracking System Calibration, integrates, Live Event Streaming in VR>
+<Training Simulations, connectedTo, Medical Applications>
+<User Interface Design, connectedTo, Ethical Considerations in AR or VR>
+<User Interface Design, connectedTo, Haptic Feedback Integration>
+<User Interface Design, connectedTo, Remote Collaboration Tools>
+<Virtual Reality Game Development, connectedTo, Headset Development>
diff --git a/test/diagrams/graph_hard/diagrams_168.txt b/test/diagrams/graph_hard/diagrams_168.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c7d5ba5d2372a23bd5aa66995e12c124684ba2a3
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_168.txt
@@ -0,0 +1,35 @@
+<3D Model Creation, creates, Immersive Storytelling>
+<AR for Navigation, connectedTo, Tracking System Calibration>
+<Architectural Visualization, connectedTo, Field of View Optimization>
+<Educational Content Development, connectedTo, Eye Tracking>
+<Educational Content Development, connectedTo, Hand Tracking and Interaction>
+<Environment Mapping, connectedTo, Field of View Optimization>
+<Environment Mapping, connectedTo, Live Event Streaming in VR>
+<Environment Mapping, connectedTo, User Experience Testing>
+<Environment Mapping, guides, Tracking System Calibration>
+<Ethical Considerations in AR or VR, captures, Virtual Showrooms>
+<Eye Tracking, optimizes, Live Event Streaming in VR>
+<Facial Recognition in AR or VR, connectedTo, Eye Tracking>
+<Field of View Optimization, connectedTo, AR for Navigation>
+<Hand Tracking and Interaction, connectedTo, AR for Navigation>
+<Hand Tracking and Interaction, connectedTo, Eye Tracking>
+<Hand Tracking and Interaction, connectedTo, Facial Recognition in AR or VR>
+<Haptic Feedback Integration, connectedTo, Educational Content Development>
+<Haptic Feedback Integration, connectedTo, Industrial Maintenance Support>
+<Hardware Prototyping, connectedTo, Retail Experience Enhancement>
+<Immersive Storytelling, connectedTo, Hardware Prototyping>
+<Industrial Maintenance Support, connectedTo, Educational Content Development>
+<Latency Reduction, connectedTo, Educational Content Development>
+<Latency Reduction, connectedTo, Eye Tracking>
+<Latency Reduction, connectedTo, Haptic Feedback Integration>
+<Live Event Streaming in VR, connectedTo, 3D Model Creation>
+<Live Event Streaming in VR, connectedTo, AR for Navigation>
+<Live Event Streaming in VR, connectedTo, Architectural Visualization>
+<Retail Experience Enhancement, connectedTo, Haptic Feedback Integration>
+<Tracking System Calibration, connectedTo, Virtual Reality Game Development>
+<User Experience Testing, connectedTo, Educational Content Development>
+<User Experience Testing, connectedTo, Ethical Considerations in AR or VR>
+<User Experience Testing, connectedTo, Haptic Feedback Integration>
+<User Experience Testing, connectedTo, Latency Reduction>
+<User Experience Testing, connectedTo, Virtual Reality Game Development>
+<Virtual Showrooms, analyzes, Hand Tracking and Interaction>
diff --git a/test/diagrams/graph_hard/diagrams_169.dot b/test/diagrams/graph_hard/diagrams_169.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a3b169f2db5e75c7e6f8655806c4a14d18c15237
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_169.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=TB
+	N0 [label="User Experience Design" color="#4DD0E1" fillcolor="#C9F0F0" shape=preparation style=filled]
+	N1 [label="Programming" color="#F06292" fillcolor="#FCE4EC" shape=document style=filled]
+	N2 [label="AI Behavior Programming" color="#F06292" fillcolor="#FCE4EC" shape=document style=filled]
+	N3 [label="Art Direction" color="#F06292" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N4 [label="Game Publishing" color="#A188DB" fillcolor="#DED7F0" shape=inputoutput style=filled]
+	N5 [label="Game Design" color="#F06292" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+	N6 [label="Mobile Game Development" color="#4DD0E1" fillcolor="#C9F0F0" shape=preparation style=filled]
+	N7 [label="Narrative Design" color="#A188DB" fillcolor="#DED7F0" shape=vnode_shape style=filled]
+	N8 [label="Motion Capture" color="#4DD0E1" fillcolor="#C9F0F0" shape=parallelogram style=filled]
+	N9 [label="Quality Assurance Testing" color="#F06292" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N10 [label="Physics Simulation" color="#A188DB" fillcolor="#DED7F0" shape=rectangle style=filled]
+	N11 [label="Sound Design" color="#4DD0E1" fillcolor="#C9F0F0" shape=database style=filled]
+	N12 [label="Game Performance Optimization" color="#F06292" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N13 [label="Voice Acting" color="#A188DB" fillcolor="#DED7F0" shape=multipledocuments style=filled]
+	N14 [label="Game Engine Customization" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N15 [label="Character Design" color="#F06292" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+	N16 [label="PC Game Development" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N17 [label="Community Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=rect style=filled]
+	N18 [label="Network Code Optimization" color="#F06292" fillcolor="#FCE4EC" shape=inputoutput style=filled]
+	S0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_In_Game Economy Design {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="In_Game Economy Design"
+		nest0_0 [label="Player Feedback Integration" color="#F06292" fillcolor="#FCE4EC" shape=preparation style=filled]
+		nest0_1 [label="Bug Fixing" color="#F06292" fillcolor="#FCE4EC" shape=rect style=filled]
+		nest0_2 [label="Monetization Strategy" color="#F06292" fillcolor="#FCE4EC" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Augmented Reality Gaming {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Augmented Reality Gaming"
+		nest1_0 [label="Game Balancing" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+		nest1_1 [label="Console Game Development" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+		nest1_2 [label="Level Design" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#F06292" penwidth=1.5 style=dashed label="advertises" dir=forward]
+	N13 -> N14 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N17 -> N18 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#F06292" penwidth=1.5 style=dashed label="innovates" dir=forward]
+	N15 -> nest0_0 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N16 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N3 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> S2 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N16 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	M0 -> N7 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N12 -> M1 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N14 -> M1 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N17 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_169.txt b/test/diagrams/graph_hard/diagrams_169.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5524985fabf2c6b413ab3d6086ac8ce81569361f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_169.txt
@@ -0,0 +1,36 @@
+<AI Behavior Programming, connectedTo, Art Direction>
+<AI Behavior Programming, connectedTo, Community Management>
+<AI Behavior Programming, connectedTo, Narrative Design>
+<Art Direction, connectedTo, Game Publishing>
+<Bug Fixing, innovates, Monetization Strategy>
+<Character Design, connectedTo, PC Game Development>
+<Character Design, connectedTo, Player Feedback Integration>
+<Community Management, connectedTo, Network Code Optimization>
+<Console Game Development, connectedTo, Level Design>
+<Game Balancing, connectedTo, Console Game Development>
+<Game Design, connectedTo, Mobile Game Development>
+<Game Engine Customization, connectedTo, Character Design>
+<Game Engine Customization, connectedTo, Community Management>
+<Game Performance Optimization, advertises, Voice Acting>
+<Game Performance Optimization, connectedTo, Community Management>
+<Game Publishing, connectedTo, Game Design>
+<Level Design, connectedTo, Programming>
+<Mobile Game Development, connectedTo, Narrative Design>
+<Monetization Strategy, connectedTo, PC Game Development>
+<Motion Capture, connectedTo, Quality Assurance Testing>
+<Narrative Design, connectedTo, Motion Capture>
+<PC Game Development, connectedTo, Community Management>
+<Physics Simulation, connectedTo, Sound Design>
+<Player Feedback Integration, connectedTo, Bug Fixing>
+<Programming, connectedTo, AI Behavior Programming>
+<Programming, connectedTo, Art Direction>
+<Programming, connectedTo, Game Balancing>
+<Programming, connectedTo, Motion Capture>
+<Programming, connectedTo, Narrative Design>
+<Quality Assurance Testing, connectedTo, Physics Simulation>
+<Sound Design, connectedTo, Game Performance Optimization>
+<User Experience Design, connectedTo, Narrative Design>
+<User Experience Design, connectedTo, PC Game Development>
+<User Experience Design, connectedTo, Physics Simulation>
+<User Experience Design, connectedTo, Programming>
+<Voice Acting, connectedTo, Game Engine Customization>
diff --git a/test/diagrams/graph_hard/diagrams_17.dot b/test/diagrams/graph_hard/diagrams_17.dot
new file mode 100644
index 0000000000000000000000000000000000000000..991312e9593f0fc623678e71c9b831556bdc11fd
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_17.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=RL
+	N0 [label="Bus Stop Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=rect style=filled]
+	N1 [label="Emergency Landing" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N2 [label="Road Network Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+	N3 [label="Platform Assignment" color="#CFCFCF" fillcolor="#F6F6F6" shape=diamond style=filled]
+	N4 [label="Route Diversion" color="#CB9BE1" fillcolor="#F2E6F5" shape=preparation style=filled]
+	N5 [label="Accident Reconstruction" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N6 [label="Route Optimization" color="#CB9BE1" fillcolor="#F2E6F5" shape=inputoutput style=filled]
+	N7 [label="Fleet Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=inputoutput style=filled]
+	N8 [label="Bridge Inspection" color="#CFCFCF" fillcolor="#F6F6F6" shape=rect style=filled]
+	N9 [label="Public Transport Ticketing" color="#CFCFCF" fillcolor="#F6F6F6" shape=document style=filled]
+	N10 [label="Vehicle Assignment" color="#CB9BE1" fillcolor="#F2E6F5" shape=diamond style=filled]
+	N11 [label="Ticket Purchase" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	S0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Boarding {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Boarding"
+		nest0_0 [label="Intermodal Transfer" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_1 [label="Location Input" color="#CFCFCF" fillcolor="#F6F6F6" shape=rectangle style=filled]
+		nest0_2 [label="Delay Alert" color="#C2B2F0" fillcolor="#EFE6FF" shape=database style=filled]
+		nest0_3 [label="Security Check" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	}
+	subgraph cluster_Parking Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Parking Management"
+		nest1_0 [label="Air Traffic Control" color="#C2B2F0" fillcolor="#EFE6FF" shape=action style=filled]
+		nest1_1 [label="Passenger Feedback" color="#CFCFCF" fillcolor="#F6F6F6" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N10 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N7 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#CB9BE1" penwidth=1.5 style=dashed label="boards" dir=forward]
+	N5 -> M1 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N7 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_17.txt b/test/diagrams/graph_hard/diagrams_17.txt
new file mode 100644
index 0000000000000000000000000000000000000000..012290829338630d606690c4f0b8aa9ed2f63883
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_17.txt
@@ -0,0 +1,28 @@
+<Accident Reconstruction, connectedTo, Fleet Management>
+<Accident Reconstruction, connectedTo, Route Optimization>
+<Air Traffic Control, connectedTo, Passenger Feedback>
+<Bridge Inspection, connectedTo, Public Transport Ticketing>
+<Bus Stop Management, connectedTo, Emergency Landing>
+<Delay Alert, connectedTo, Security Check>
+<Delay Alert, partOf, Delay Alert>
+<Emergency Landing, connectedTo, Road Network Management>
+<Fleet Management, connectedTo, Air Traffic Control>
+<Fleet Management, connectedTo, Bridge Inspection>
+<Fleet Management, connectedTo, Public Transport Ticketing>
+<Fleet Management, connectedTo, Ticket Purchase>
+<Fleet Management, connectedTo, Vehicle Assignment>
+<Intermodal Transfer, connectedTo, Location Input>
+<Intermodal Transfer, partOf, Intermodal Transfer>
+<Location Input, connectedTo, Delay Alert>
+<Location Input, partOf, Location Input>
+<Passenger Feedback, connectedTo, Vehicle Assignment>
+<Platform Assignment, boards, Fleet Management>
+<Platform Assignment, connectedTo, Intermodal Transfer>
+<Platform Assignment, connectedTo, Route Diversion>
+<Public Transport Ticketing, connectedTo, Vehicle Assignment>
+<Road Network Management, connectedTo, Platform Assignment>
+<Route Diversion, connectedTo, Accident Reconstruction>
+<Route Optimization, connectedTo, Fleet Management>
+<Security Check, connectedTo, Route Diversion>
+<Security Check, partOf, Security Check>
+<Vehicle Assignment, connectedTo, Ticket Purchase>
diff --git a/test/diagrams/graph_hard/diagrams_170.dot b/test/diagrams/graph_hard/diagrams_170.dot
new file mode 100644
index 0000000000000000000000000000000000000000..261765a208913bac49221e5312ef41a3f8762f5f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_170.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=RL
+	N0 [label="Game Performance Optimization" color="#C0CA33" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N1 [label="Mobile Game Development" color="#C0CA33" fillcolor="#F9FBE7" shape=preparation style=filled]
+	N2 [label="Art Direction" color="#66BB6A" fillcolor="#E8F5E9" shape=parallelogram style=filled]
+	N3 [label="Asset Creation" color="#66BB6A" fillcolor="#E8F5E9" shape=document style=filled]
+	N4 [label="Bug Fixing" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N5 [label="Live Operations" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N6 [label="Physics Simulation" color="#4DD0E1" fillcolor="#C9F0F0" shape=vnode_shape style=filled]
+	N7 [label="Console Game Development" color="#4DD0E1" fillcolor="#C9F0F0" shape=multipledocuments style=filled]
+	N8 [label="Multiplayer Game Development" color="#4DD0E1" fillcolor="#C9F0F0" shape=diamond style=filled]
+	N9 [label="Monetization Strategy" color="#4DD0E1" fillcolor="#C9F0F0" shape=document style=filled]
+	N10 [label="Character Design" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+	N11 [label="Game Publishing" color="#66BB6A" fillcolor="#E8F5E9" shape=action style=filled]
+	N12 [label="Augmented Reality Gaming" color="#66BB6A" fillcolor="#E8F5E9" shape=preparation style=filled]
+	N13 [label="Sound Design" color="#4DD0E1" fillcolor="#C9F0F0" shape=action style=filled]
+	N14 [label="Narrative Design" color="#66BB6A" fillcolor="#E8F5E9" shape=inputoutput style=filled]
+	N15 [label="Marketing and Promotion" color="#C0CA33" fillcolor="#F9FBE7" shape=inputoutput style=filled]
+	N16 [label="Player Feedback Integration" color="#4DD0E1" fillcolor="#C9F0F0" shape=vnode_shape style=filled]
+	N17 [label="Localization" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N18 [label="User Experience Design" color="#66BB6A" fillcolor="#E8F5E9" shape=vnode_shape style=filled]
+	N19 [label="Anti_Cheat Development" color="#C0CA33" fillcolor="#F9FBE7" shape=inputoutput style=filled]
+	S0 [label="" color="#C0CA33" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4DD0E1" fillcolor="#C9F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#66BB6A" fillcolor="#E8F5E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_PC Game Development {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="PC Game Development"
+		nest0_0 [label="Engine Development" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+		nest0_1 [label="Level Design" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	}
+	subgraph cluster_Storytelling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Storytelling"
+		nest1_0 [label="User Interface Design" color="#C0CA33" fillcolor="#F9FBE7" shape=diamond style=filled]
+		nest1_1 [label="Quality Assurance Testing" color="#4DD0E1" fillcolor="#C9F0F0" shape=multipledocuments style=filled]
+		nest1_2 [label="Motion Capture" color="#C0CA33" fillcolor="#F9FBE7" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#C0CA33" penwidth=1.5 style=dashed label="renders" dir=forward]
+	N11 -> N12 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#4DD0E1" penwidth=1.5 style=solid label="communicates" dir=forward]
+	N15 -> N16 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N17 -> N18 [color="#000000" penwidth=1.5 style=solid label="organizes" dir=forward]
+	N18 -> N19 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N13 -> nest0_0 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N11 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> nest1_0 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N4 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	S0 -> N19 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N11 -> S1 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N16 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N10 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> M1 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N13 -> M1 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	M1 -> N16 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_170.txt b/test/diagrams/graph_hard/diagrams_170.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2121ba451a76bc2a2d9e0b37c5d6cea008f704fb
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_170.txt
@@ -0,0 +1,38 @@
+<Art Direction, connectedTo, Asset Creation>
+<Asset Creation, connectedTo, Bug Fixing>
+<Augmented Reality Gaming, connectedTo, Player Feedback Integration>
+<Augmented Reality Gaming, connectedTo, Sound Design>
+<Augmented Reality Gaming, connectedTo, User Interface Design>
+<Bug Fixing, connectedTo, Live Operations>
+<Character Design, connectedTo, Player Feedback Integration>
+<Character Design, renders, Game Publishing>
+<Console Game Development, connectedTo, Anti_Cheat Development>
+<Console Game Development, connectedTo, Monetization Strategy>
+<Console Game Development, connectedTo, Multiplayer Game Development>
+<Engine Development, connectedTo, Level Design>
+<Game Performance Optimization, connectedTo, Mobile Game Development>
+<Game Publishing, connectedTo, Augmented Reality Gaming>
+<Game Publishing, connectedTo, Marketing and Promotion>
+<Game Publishing, connectedTo, Narrative Design>
+<Game Publishing, connectedTo, Player Feedback Integration>
+<Level Design, connectedTo, Game Publishing>
+<Live Operations, connectedTo, Physics Simulation>
+<Localization, organizes, User Experience Design>
+<Marketing and Promotion, connectedTo, Player Feedback Integration>
+<Mobile Game Development, connectedTo, Art Direction>
+<Monetization Strategy, connectedTo, Character Design>
+<Monetization Strategy, connectedTo, Player Feedback Integration>
+<Motion Capture, connectedTo, Bug Fixing>
+<Motion Capture, partOf, Motion Capture>
+<Multiplayer Game Development, connectedTo, Monetization Strategy>
+<Narrative Design, communicates, Marketing and Promotion>
+<Physics Simulation, connectedTo, Console Game Development>
+<Player Feedback Integration, connectedTo, Localization>
+<Quality Assurance Testing, connectedTo, Motion Capture>
+<Quality Assurance Testing, partOf, Quality Assurance Testing>
+<Sound Design, connectedTo, Engine Development>
+<Sound Design, connectedTo, Narrative Design>
+<Sound Design, connectedTo, Player Feedback Integration>
+<User Experience Design, connectedTo, Anti_Cheat Development>
+<User Interface Design, connectedTo, Quality Assurance Testing>
+<User Interface Design, partOf, User Interface Design>
diff --git a/test/diagrams/graph_hard/diagrams_171.dot b/test/diagrams/graph_hard/diagrams_171.dot
new file mode 100644
index 0000000000000000000000000000000000000000..504c1d5e96c7e2884301126fe2a8611b5f228b55
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_171.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=LR
+	N0 [label="Art Direction" color="#CB9BE1" fillcolor="#F2E6F5" shape=multipledocuments style=filled]
+	N1 [label="Marketing and Promotion" color="#A1D7CD" fillcolor="#EDF5F3" shape=parallelogram style=filled]
+	N2 [label="Level Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N3 [label="Character Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=multipledocuments style=filled]
+	N4 [label="Game Analytics" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N5 [label="Mobile Game Development" color="#CB9BE1" fillcolor="#F2E6F5" shape=database style=filled]
+	N6 [label="Storytelling" color="#CB9BE1" fillcolor="#F2E6F5" shape=vnode_shape style=filled]
+	N7 [label="PC Game Development" color="#CDDC39" fillcolor="#E6EE9C" shape=vnode_shape style=filled]
+	N8 [label="User Interface Design" color="#CDDC39" fillcolor="#E6EE9C" shape=inputoutput style=filled]
+	N9 [label="Bug Fixing" color="#CDDC39" fillcolor="#E6EE9C" shape=predefinedprocess style=filled]
+	N10 [label="Game Engine Customization" color="#CDDC39" fillcolor="#E6EE9C" shape=action style=filled]
+	N11 [label="Sound Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=preparation style=filled]
+	S0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Quality Assurance Testing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Quality Assurance Testing"
+		nest0_0 [label="Localization" color="#A1D7CD" fillcolor="#EDF5F3" shape=multipledocuments style=filled]
+		nest0_1 [label="Asset Creation" color="#A1D7CD" fillcolor="#EDF5F3" shape=rect style=filled]
+		nest0_2 [label="Player Feedback Integration" color="#A1D7CD" fillcolor="#EDF5F3" shape=rectangle style=filled]
+	}
+	subgraph cluster_Anti_Cheat Development {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Anti_Cheat Development"
+		nest1_0 [label="In_Game Economy Design" color="#CDDC39" fillcolor="#E6EE9C" shape=inputoutput style=filled]
+		nest1_1 [label="Game Performance Optimization" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+		nest1_2 [label="Player Progression Systems" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	}
+	N0 -> N1 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N7 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N10 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N1 -> S2 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N9 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#A1D7CD" penwidth=1.5 style=dashed label="narrates" dir=forward]
+	M1 -> N10 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_172.dot b/test/diagrams/graph_hard/diagrams_172.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0ddb84582e9478b194402ca564a497f721e7e449
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_172.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=RL
+	N0 [label="Sound System Design" color="#FFC2C2" fillcolor="#FFEBEB" shape=diamond style=filled]
+	N1 [label="Merchandise Sales" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N2 [label="Music Licensing" color="#FFC2C2" fillcolor="#FFEBEB" shape=predefinedprocess style=filled]
+	N3 [label="Music Education" color="#FFC2C2" fillcolor="#FFEBEB" shape=predefinedprocess style=filled]
+	N4 [label="Recording" color="#FFC2C2" fillcolor="#FFEBEB" shape=action style=filled]
+	N5 [label="Lyric Writing" color="#FFC2C2" fillcolor="#FFEBEB" shape=preparation style=filled]
+	N6 [label="Sound Design for Media" color="#FFCC80" fillcolor="#FFF0CC" shape=action style=filled]
+	N7 [label="Arrangement" color="#FFCC80" fillcolor="#FFF0CC" shape=rect style=filled]
+	N8 [label="Sampling" color="#3F51B5" fillcolor="#C5CAE9" shape=multipledocuments style=filled]
+	N9 [label="Music for Film or TV or Games" color="#3F51B5" fillcolor="#C5CAE9" shape=parallelogram style=filled]
+	N10 [label="Tour Management" color="#FFC2C2" fillcolor="#FFEBEB" shape=database style=filled]
+	N11 [label="Fan Engagement Strategy" color="#3F51B5" fillcolor="#C5CAE9" shape=action style=filled]
+	N12 [label="Performance" color="#FFC2C2" fillcolor="#FFEBEB" shape=database style=filled]
+	S0 [label="" color="#FFC2C2" fillcolor="#FFEBEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFC2C2" fillcolor="#FFEBEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFC2C2" fillcolor="#FFEBEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Songwriting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Songwriting"
+		nest0_0 [label="Music Theory Analysis" color="#3F51B5" fillcolor="#C5CAE9" shape=vnode_shape style=filled]
+		nest0_1 [label="Concert Promotion" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+		nest0_2 [label="Streaming Platform Management" color="#FFCC80" fillcolor="#FFF0CC" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Music Distribution {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Music Distribution"
+		nest1_0 [label="Mastering" color="#FFCC80" fillcolor="#FFF0CC" shape=rect style=filled]
+		nest1_1 [label="Instrumental Performance" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+		nest1_2 [label="Music Festival Organization" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+		nest1_3 [label="Synthesizer Programming" color="#FFCC80" fillcolor="#FFF0CC" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFC2C2" penwidth=1.5 style=solid label="engineers" dir=forward]
+	N3 -> N4 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FFCC80" penwidth=1.5 style=dashed label="produces" dir=forward]
+	N8 -> N9 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid label="plays" dir=forward]
+	N11 -> N12 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest0_0 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N7 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S0 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N3 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=dashed label="mixes" dir=forward]
+	N2 -> M0 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	M0 -> N9 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#000000" penwidth=1.5 style=solid label="captures" dir=forward]
+	N9 -> M2 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M2 -> N12 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_172.txt b/test/diagrams/graph_hard/diagrams_172.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b12c86901e418d67b4cac7a718a4504be56a15ed
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_172.txt
@@ -0,0 +1,39 @@
+<Arrangement, produces, Sampling>
+<Concert Promotion, connectedTo, Streaming Platform Management>
+<Concert Promotion, partOf, Concert Promotion>
+<Fan Engagement Strategy, connectedTo, Performance>
+<Instrumental Performance, connectedTo, Music Festival Organization>
+<Lyric Writing, connectedTo, Music for Film or TV or Games>
+<Lyric Writing, connectedTo, Sound Design for Media>
+<Mastering, connectedTo, Instrumental Performance>
+<Merchandise Sales, connectedTo, Arrangement>
+<Merchandise Sales, connectedTo, Mastering>
+<Merchandise Sales, connectedTo, Music Education>
+<Merchandise Sales, connectedTo, Music Licensing>
+<Merchandise Sales, connectedTo, Performance>
+<Merchandise Sales, connectedTo, Sound Design for Media>
+<Music Education, connectedTo, Arrangement>
+<Music Education, connectedTo, Music Theory Analysis>
+<Music Education, connectedTo, Recording>
+<Music Festival Organization, connectedTo, Synthesizer Programming>
+<Music Licensing, connectedTo, Music for Film or TV or Games>
+<Music Licensing, engineers, Music Education>
+<Music Theory Analysis, connectedTo, Concert Promotion>
+<Music Theory Analysis, partOf, Music Theory Analysis>
+<Music for Film or TV or Games, connectedTo, Performance>
+<Music for Film or TV or Games, connectedTo, Tour Management>
+<Recording, captures, Performance>
+<Recording, connectedTo, Arrangement>
+<Recording, connectedTo, Lyric Writing>
+<Recording, connectedTo, Music for Film or TV or Games>
+<Recording, connectedTo, Tour Management>
+<Recording, mixes, Music for Film or TV or Games>
+<Sampling, connectedTo, Music for Film or TV or Games>
+<Sampling, connectedTo, Performance>
+<Sound Design for Media, connectedTo, Arrangement>
+<Sound System Design, connectedTo, Arrangement>
+<Sound System Design, connectedTo, Merchandise Sales>
+<Streaming Platform Management, connectedTo, Arrangement>
+<Streaming Platform Management, partOf, Streaming Platform Management>
+<Synthesizer Programming, connectedTo, Recording>
+<Tour Management, plays, Fan Engagement Strategy>
diff --git a/test/diagrams/graph_hard/diagrams_173.dot b/test/diagrams/graph_hard/diagrams_173.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f54491981f5f8471d4b92d2ef0e7dc2cfd4fb20e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_173.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=LR
+	N0 [label="Sound Design for Media" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N1 [label="Music Festival Organization" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N2 [label="Live Sound Engineering" color="#FFEB3B" fillcolor="#FFF9C4" shape=vnode_shape style=filled]
+	N3 [label="Synthesizer Programming" color="#FFEB3B" fillcolor="#FFF9C4" shape=document style=filled]
+	N4 [label="Mixing" color="#B8C0F5" fillcolor="#ECF0FD" shape=inputoutput style=filled]
+	N5 [label="Merchandise Sales" color="#64B5F6" fillcolor="#E3F2FD" shape=database style=filled]
+	N6 [label="Sampling" color="#FFEB3B" fillcolor="#FFF9C4" shape=rect style=filled]
+	N7 [label="Lyric Writing" color="#FFEB3B" fillcolor="#FFF9C4" shape=rect style=filled]
+	N8 [label="Fan Engagement Strategy" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+	N9 [label="Composition" color="#FFEB3B" fillcolor="#FFF9C4" shape=preparation style=filled]
+	N10 [label="Audio Engineering" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N11 [label="Music Theory Analysis" color="#64B5F6" fillcolor="#E3F2FD" shape=document style=filled]
+	N12 [label="Streaming Platform Management" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+	N13 [label="Mastering" color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+	S0 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Music for Film or TV or Games {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Music for Film or TV or Games"
+		nest0_0 [label="Instrumental Performance" color="#B8C0F5" fillcolor="#ECF0FD" shape=vnode_shape style=filled]
+		nest0_1 [label="Music Video Production" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+		nest0_2 [label="A&R" color="#64B5F6" fillcolor="#E3F2FD" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Crowdfunding for Music Projects {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Crowdfunding for Music Projects"
+		nest1_0 [label="Beat Making" color="#FFEB3B" fillcolor="#FFF9C4" shape=multipledocuments style=filled]
+		nest1_1 [label="Music Distribution" color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+		nest1_2 [label="Music Licensing" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+		nest1_3 [label="Tour Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFEB3B" penwidth=1.5 style=solid label="integrates" dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#64B5F6" penwidth=1.5 style=solid label="records" dir=forward]
+	N10 -> N11 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N8 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#64B5F6" penwidth=1.5 style=dashed label="critiques" dir=forward]
+	nest1_1 -> nest1_2 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N12 -> nest1_0 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N9 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N10 -> S0 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#000000" penwidth=1.5 style=dashed label="writes" dir=forward]
+	N8 -> S1 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> S2 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#B8C0F5" penwidth=1.5 style=dashed label="trains" dir=forward]
+	N3 -> M1 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	M1 -> N11 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	M2 -> N4 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_173.txt b/test/diagrams/graph_hard/diagrams_173.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8da6cd8d1f5219e97d9ab95f06c4ffeec0b20801
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_173.txt
@@ -0,0 +1,35 @@
+<A&R, connectedTo, Fan Engagement Strategy>
+<Audio Engineering, connectedTo, Mastering>
+<Audio Engineering, connectedTo, Music Theory Analysis>
+<Audio Engineering, writes, Streaming Platform Management>
+<Beat Making, critiques, Music Distribution>
+<Composition, records, Audio Engineering>
+<Fan Engagement Strategy, connectedTo, Audio Engineering>
+<Fan Engagement Strategy, connectedTo, Composition>
+<Fan Engagement Strategy, connectedTo, Music Theory Analysis>
+<Instrumental Performance, connectedTo, Music Video Production>
+<Live Sound Engineering, connectedTo, Mixing>
+<Live Sound Engineering, connectedTo, Music Theory Analysis>
+<Live Sound Engineering, connectedTo, Synthesizer Programming>
+<Lyric Writing, connectedTo, Fan Engagement Strategy>
+<Merchandise Sales, connectedTo, Sampling>
+<Mixing, connectedTo, Merchandise Sales>
+<Mixing, connectedTo, Music Theory Analysis>
+<Music Distribution, connectedTo, Music Licensing>
+<Music Festival Organization, connectedTo, Fan Engagement Strategy>
+<Music Festival Organization, connectedTo, Live Sound Engineering>
+<Music Festival Organization, connectedTo, Mixing>
+<Music Festival Organization, connectedTo, Music Theory Analysis>
+<Music Festival Organization, trains, Audio Engineering>
+<Music Licensing, connectedTo, Tour Management>
+<Music Theory Analysis, connectedTo, Streaming Platform Management>
+<Music Video Production, connectedTo, A&R>
+<Sampling, connectedTo, Lyric Writing>
+<Sound Design for Media, connectedTo, Mixing>
+<Sound Design for Media, connectedTo, Music Festival Organization>
+<Streaming Platform Management, connectedTo, Beat Making>
+<Streaming Platform Management, connectedTo, Mastering>
+<Synthesizer Programming, connectedTo, Instrumental Performance>
+<Synthesizer Programming, connectedTo, Music Theory Analysis>
+<Synthesizer Programming, integrates, Mixing>
+<Tour Management, connectedTo, Composition>
diff --git a/test/diagrams/graph_hard/diagrams_174.dot b/test/diagrams/graph_hard/diagrams_174.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e3c838d98ec26f5c24469a7b170f70f013df122d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_174.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=BT
+	N0 [label="Music Education" color="#CB9BE1" fillcolor="#F2E6F5" shape=predefinedprocess style=filled]
+	N1 [label="Sound System Design" color="#7E57C2" fillcolor="#EDE7F6" shape=action style=filled]
+	N2 [label="Vocal Performance" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N3 [label="Music Therapy" color="#7E57C2" fillcolor="#EDE7F6" shape=action style=filled]
+	N4 [label="Fan Engagement Strategy" color="#2196F3" fillcolor="#BBDEFB" shape=parallelogram style=filled]
+	N5 [label="Digital Audio Workstation Operation" color="#CB9BE1" fillcolor="#F2E6F5" shape=diamond style=filled]
+	N6 [label="Concert Promotion" color="#2196F3" fillcolor="#BBDEFB" shape=document style=filled]
+	N7 [label="Synthesizer Programming" color="#CB9BE1" fillcolor="#F2E6F5" shape=database style=filled]
+	N8 [label="Music Theory Analysis" color="#CB9BE1" fillcolor="#F2E6F5" shape=predefinedprocess style=filled]
+	N9 [label="A&R" color="#CB9BE1" fillcolor="#F2E6F5" shape=predefinedprocess style=filled]
+	N10 [label="Instrumental Performance" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N11 [label="Tour Management" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N12 [label="Music Distribution" color="#7E57C2" fillcolor="#EDE7F6" shape=document style=filled]
+	N13 [label="Sampling" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N14 [label="Beat Making" color="#CB9BE1" fillcolor="#F2E6F5" shape=predefinedprocess style=filled]
+	N15 [label="Music Production" color="#7E57C2" fillcolor="#EDE7F6" shape=diamond style=filled]
+	N16 [label="Music Video Production" color="#7E57C2" fillcolor="#EDE7F6" shape=inputoutput style=filled]
+	N17 [label="Performance" color="#2196F3" fillcolor="#BBDEFB" shape=rectangle style=filled]
+	N18 [label="Mixing" color="#CB9BE1" fillcolor="#F2E6F5" shape=diamond style=filled]
+	N19 [label="Music for Film or TV or Games" color="#2196F3" fillcolor="#BBDEFB" shape=predefinedprocess style=filled]
+	S0 [label="" color="#2196F3" fillcolor="#BBDEFB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#2196F3" fillcolor="#BBDEFB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#2196F3" fillcolor="#BBDEFB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Live Sound Engineering {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Live Sound Engineering"
+		nest0_0 [label="Merchandise Sales" color="#2196F3" fillcolor="#BBDEFB" shape=document style=filled]
+		nest0_1 [label="Record Label Operations" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+		nest0_2 [label="Royalty Collection" color="#2196F3" fillcolor="#BBDEFB" shape=parallelogram style=filled]
+		nest0_3 [label="Mastering" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Artist Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Artist Management"
+		nest1_0 [label="Music Festival Organization" color="#2196F3" fillcolor="#BBDEFB" shape=multipledocuments style=filled]
+		nest1_1 [label="Songwriting" color="#2196F3" fillcolor="#BBDEFB" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#7E57C2" penwidth=1.5 style=dashed label="transcribes" dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed label="streams" dir=forward]
+	N14 -> N15 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#CB9BE1" penwidth=1.5 style=dashed label="produces" dir=forward]
+	N16 -> N17 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N17 -> N18 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N18 -> N19 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N14 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N5 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N14 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N18 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> S1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N18 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N17 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N7 -> M0 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N12 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> M1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N9 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_175.dot b/test/diagrams/graph_hard/diagrams_175.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7b8891aa4a434e1bcf8e0173813d1c619a3b86a1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_175.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=RL
+	N0 [label="Set Construction" color="#FFB2A5" fillcolor="#FFDCD6" shape=diamond style=filled]
+	N1 [label="Storyboarding" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N2 [label="Prop Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N3 [label="Art Direction" color="#FFCC7A" fillcolor="#FFF6D9" shape=rectangle style=filled]
+	N4 [label="Archiving and Preservation" color="#FFB2A5" fillcolor="#FFDCD6" shape=parallelogram style=filled]
+	N5 [label="Green Production Practices" color="#5C6BC0" fillcolor="#E8EAF6" shape=vnode_shape style=filled]
+	N6 [label="Production Accounting" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N7 [label="Directing" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N8 [label="Lighting Design" color="#FFB2A5" fillcolor="#FFDCD6" shape=vnode_shape style=filled]
+	N9 [label="Post_production Audio" color="#FFCC7A" fillcolor="#FFF6D9" shape=preparation style=filled]
+	N10 [label="Makeup and Hair Design" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N11 [label="Film Financing" color="#FFB2A5" fillcolor="#FFDCD6" shape=document style=filled]
+	S0 [label="" color="#FFB2A5" fillcolor="#FFDCD6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFB2A5" fillcolor="#FFDCD6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Pre_production Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Pre_production Planning"
+		nest0_0 [label="Tax Incentive Management" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+		nest0_1 [label="Screenwriting Workshops" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+		nest0_2 [label="Crew Management" color="#5C6BC0" fillcolor="#E8EAF6" shape=diamond style=filled]
+		nest0_3 [label="Talent Negotiation" color="#FFCC7A" fillcolor="#FFF6D9" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Casting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Casting"
+		nest1_0 [label="Insurance Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=document style=filled]
+		nest1_1 [label="Visual Effects" color="#5C6BC0" fillcolor="#E8EAF6" shape=preparation style=filled]
+		nest1_2 [label="Script Development" color="#5C6BC0" fillcolor="#E8EAF6" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N10 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest1_0 [color="#5C6BC0" penwidth=1.5 style=solid label="publishes" dir=forward]
+	nest1_2 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	M0 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_175.txt b/test/diagrams/graph_hard/diagrams_175.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5e68b80839af17be3baf8bb4e0586470d1734e42
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_175.txt
@@ -0,0 +1,30 @@
+<Archiving and Preservation, connectedTo, Green Production Practices>
+<Art Direction, connectedTo, Archiving and Preservation>
+<Art Direction, connectedTo, Directing>
+<Art Direction, connectedTo, Makeup and Hair Design>
+<Crew Management, connectedTo, Talent Negotiation>
+<Directing, connectedTo, Lighting Design>
+<Directing, connectedTo, Tax Incentive Management>
+<Green Production Practices, connectedTo, Directing>
+<Green Production Practices, connectedTo, Film Financing>
+<Green Production Practices, connectedTo, Makeup and Hair Design>
+<Green Production Practices, connectedTo, Production Accounting>
+<Insurance Management, connectedTo, Visual Effects>
+<Insurance Management, partOf, Insurance Management>
+<Lighting Design, connectedTo, Post_production Audio>
+<Makeup and Hair Design, connectedTo, Film Financing>
+<Post_production Audio, connectedTo, Makeup and Hair Design>
+<Post_production Audio, publishes, Insurance Management>
+<Production Accounting, connectedTo, Directing>
+<Prop Management, connectedTo, Art Direction>
+<Screenwriting Workshops, connectedTo, Crew Management>
+<Script Development, connectedTo, Green Production Practices>
+<Script Development, partOf, Script Development>
+<Set Construction, connectedTo, Art Direction>
+<Set Construction, connectedTo, Storyboarding>
+<Storyboarding, connectedTo, Art Direction>
+<Storyboarding, connectedTo, Prop Management>
+<Talent Negotiation, connectedTo, Makeup and Hair Design>
+<Tax Incentive Management, connectedTo, Screenwriting Workshops>
+<Visual Effects, connectedTo, Script Development>
+<Visual Effects, partOf, Visual Effects>
diff --git a/test/diagrams/graph_hard/diagrams_176.dot b/test/diagrams/graph_hard/diagrams_176.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b75dac514c27c863ecbc5129028dc041f6859eac
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_176.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Location Scouting" color="#4285F4" fillcolor="#D0E0F8" shape=document style=filled]
+	N1 [label="Set Construction" color="#A1D7CD" fillcolor="#EDF5F3" shape=rectangle style=filled]
+	N2 [label="Screenwriting Workshops" color="#A1D7CD" fillcolor="#EDF5F3" shape=parallelogram style=filled]
+	N3 [label="Directing" color="#4285F4" fillcolor="#D0E0F8" shape=rectangle style=filled]
+	N4 [label="Art Direction" color="#A1D7CD" fillcolor="#EDF5F3" shape=vnode_shape style=filled]
+	N5 [label="Legal Compliance" color="#C2B2F0" fillcolor="#EFE6FF" shape=document style=filled]
+	N6 [label="Editing" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N7 [label="Film Financing" color="#C2B2F0" fillcolor="#EFE6FF" shape=preparation style=filled]
+	N8 [label="Pre_production Planning" color="#A1D7CD" fillcolor="#EDF5F3" shape=diamond style=filled]
+	N9 [label="Insurance Management" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N10 [label="Digital Asset Management" color="#4285F4" fillcolor="#D0E0F8" shape=multipledocuments style=filled]
+	N11 [label="Distribution Strategy" color="#A1D7CD" fillcolor="#EDF5F3" shape=predefinedprocess style=filled]
+	N12 [label="Lighting Design" color="#C2B2F0" fillcolor="#EFE6FF" shape=multipledocuments style=filled]
+	N13 [label="Archiving and Preservation" color="#C2B2F0" fillcolor="#EFE6FF" shape=action style=filled]
+	N14 [label="Sound Recording" color="#A1D7CD" fillcolor="#EDF5F3" shape=database style=filled]
+	S0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Visual Effects {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Visual Effects"
+		nest0_0 [label="Audience Research" color="#4285F4" fillcolor="#D0E0F8" shape=vnode_shape style=filled]
+		nest0_1 [label="Film Scoring" color="#4285F4" fillcolor="#D0E0F8" shape=rectangle style=filled]
+		nest0_2 [label="Film Festival Submission" color="#C2B2F0" fillcolor="#EFE6FF" shape=document style=filled]
+		nest0_3 [label="Script Development" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	}
+	subgraph cluster_Production Accounting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Production Accounting"
+		nest1_0 [label="Virtual Production Techniques" color="#4285F4" fillcolor="#D0E0F8" shape=multipledocuments style=filled]
+		nest1_1 [label="Tax Incentive Management" color="#4285F4" fillcolor="#D0E0F8" shape=multipledocuments style=filled]
+		nest1_2 [label="Cinematography" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N12 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N4 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N10 -> S0 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#C2B2F0" penwidth=1.5 style=solid label="manages" dir=forward]
+	S0 -> N12 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N12 -> M0 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N9 -> M0 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	M0 -> N14 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N6 -> M1 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N11 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_176.txt b/test/diagrams/graph_hard/diagrams_176.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9b1fb76294e69c35d8ef0b23b82746a654593c4e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_176.txt
@@ -0,0 +1,33 @@
+<Archiving and Preservation, connectedTo, Sound Recording>
+<Art Direction, connectedTo, Audience Research>
+<Art Direction, connectedTo, Legal Compliance>
+<Audience Research, connectedTo, Film Scoring>
+<Cinematography, connectedTo, Art Direction>
+<Digital Asset Management, connectedTo, Archiving and Preservation>
+<Digital Asset Management, connectedTo, Distribution Strategy>
+<Digital Asset Management, connectedTo, Lighting Design>
+<Digital Asset Management, manages, Sound Recording>
+<Directing, connectedTo, Art Direction>
+<Directing, connectedTo, Distribution Strategy>
+<Distribution Strategy, connectedTo, Lighting Design>
+<Editing, connectedTo, Distribution Strategy>
+<Editing, connectedTo, Film Financing>
+<Film Festival Submission, connectedTo, Script Development>
+<Film Financing, connectedTo, Pre_production Planning>
+<Film Scoring, connectedTo, Film Festival Submission>
+<Insurance Management, connectedTo, Digital Asset Management>
+<Insurance Management, connectedTo, Sound Recording>
+<Insurance Management, connectedTo, Virtual Production Techniques>
+<Legal Compliance, connectedTo, Editing>
+<Legal Compliance, connectedTo, Sound Recording>
+<Lighting Design, connectedTo, Archiving and Preservation>
+<Lighting Design, connectedTo, Sound Recording>
+<Location Scouting, connectedTo, Set Construction>
+<Pre_production Planning, connectedTo, Insurance Management>
+<Screenwriting Workshops, connectedTo, Directing>
+<Script Development, connectedTo, Lighting Design>
+<Set Construction, connectedTo, Digital Asset Management>
+<Set Construction, connectedTo, Film Financing>
+<Set Construction, connectedTo, Screenwriting Workshops>
+<Tax Incentive Management, connectedTo, Cinematography>
+<Virtual Production Techniques, connectedTo, Tax Incentive Management>
diff --git a/test/diagrams/graph_hard/diagrams_177.dot b/test/diagrams/graph_hard/diagrams_177.dot
new file mode 100644
index 0000000000000000000000000000000000000000..638d29d622edb3a9dc875e5fc63998c57685dc21
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_177.dot
@@ -0,0 +1,88 @@
+digraph {
+	rankdir=LR
+	N0 [label="Crew Management" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N1 [label="Makeup and Hair Design" color="#388E3C" fillcolor="#C8E6C9" shape=database style=filled]
+	N2 [label="Casting" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N3 [label="Film Scoring" color="#BCB88A" fillcolor="#F5F5DC" shape=parallelogram style=filled]
+	N4 [label="Storyboarding" color="#E91E63" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N5 [label="Special Effects" color="#E91E63" fillcolor="#FCE4EC" shape=inputoutput style=filled]
+	N6 [label="Budget Management" color="#388E3C" fillcolor="#C8E6C9" shape=preparation style=filled]
+	N7 [label="Script Development" color="#BCB88A" fillcolor="#F5F5DC" shape=rectangle style=filled]
+	N8 [label="Film Financing" color="#BCB88A" fillcolor="#F5F5DC" shape=inputoutput style=filled]
+	N9 [label="Film Festival Submission" color="#388E3C" fillcolor="#C8E6C9" shape=database style=filled]
+	N10 [label="Insurance Management" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N11 [label="Pre_production Planning" color="#BCB88A" fillcolor="#F5F5DC" shape=database style=filled]
+	N12 [label="Prop Management" color="#BCB88A" fillcolor="#F5F5DC" shape=multipledocuments style=filled]
+	N13 [label="Production Scheduling" color="#E91E63" fillcolor="#FCE4EC" shape=document style=filled]
+	N14 [label="Cinematography" color="#BCB88A" fillcolor="#F5F5DC" shape=database style=filled]
+	N15 [label="Location Scouting" color="#BCB88A" fillcolor="#F5F5DC" shape=predefinedprocess style=filled]
+	N16 [label="Set Construction" color="#E91E63" fillcolor="#FCE4EC" shape=vnode_shape style=filled]
+	N17 [label="Remote Collaboration Tools" color="#E91E63" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+	N18 [label="Talent Negotiation" color="#E91E63" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+	N19 [label="Green Production Practices" color="#388E3C" fillcolor="#C8E6C9" shape=action style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Distribution Strategy {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Distribution Strategy"
+		nest0_0 [label="Art Direction" color="#388E3C" fillcolor="#C8E6C9" shape=database style=filled]
+		nest0_1 [label="Screenwriting Workshops" color="#E91E63" fillcolor="#FCE4EC" shape=action style=filled]
+		nest0_2 [label="Archiving and Preservation" color="#E91E63" fillcolor="#FCE4EC" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Costume Design {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Costume Design"
+		nest1_0 [label="Tax Incentive Management" color="#BCB88A" fillcolor="#F5F5DC" shape=vnode_shape style=filled]
+		nest1_1 [label="Digital Asset Management" color="#E91E63" fillcolor="#FCE4EC" shape=inputoutput style=filled]
+		nest1_2 [label="Marketing and Publicity" color="#BCB88A" fillcolor="#F5F5DC" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#BCB88A" penwidth=1.5 style=dashed label="publishes" dir=forward]
+	N3 -> N4 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#388E3C" penwidth=1.5 style=dashed label="budgets" dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N17 -> N18 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N18 -> N19 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#000000" penwidth=1.5 style=solid label="captures" dir=forward]
+	nest0_2 -> N19 [color="#388E3C" penwidth=1.5 style=solid label="color grades" dir=forward]
+	nest1_0 -> nest1_1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#000000" penwidth=1.5 style=solid label="mixes" dir=forward]
+	nest1_2 -> N11 [color="#BCB88A" penwidth=1.5 style=dashed label="licenses" dir=forward]
+	N7 -> S0 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S0 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N19 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N14 -> S1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S1 -> N17 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N18 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N19 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N13 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N9 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	M1 -> N15 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_177.txt b/test/diagrams/graph_hard/diagrams_177.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5e7f8756659f06a0d4b5b5971461a57c18b56c83
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_177.txt
@@ -0,0 +1,41 @@
+<Archiving and Preservation, color grades, Green Production Practices>
+<Art Direction, connectedTo, Screenwriting Workshops>
+<Budget Management, connectedTo, Production Scheduling>
+<Budget Management, connectedTo, Script Development>
+<Casting, connectedTo, Production Scheduling>
+<Casting, publishes, Film Scoring>
+<Cinematography, budgets, Location Scouting>
+<Cinematography, connectedTo, Green Production Practices>
+<Cinematography, connectedTo, Remote Collaboration Tools>
+<Cinematography, connectedTo, Set Construction>
+<Cinematography, connectedTo, Talent Negotiation>
+<Crew Management, connectedTo, Location Scouting>
+<Crew Management, connectedTo, Makeup and Hair Design>
+<Digital Asset Management, connectedTo, Marketing and Publicity>
+<Film Festival Submission, connectedTo, Insurance Management>
+<Film Festival Submission, connectedTo, Location Scouting>
+<Film Festival Submission, mixes, Tax Incentive Management>
+<Film Financing, connectedTo, Film Festival Submission>
+<Film Financing, connectedTo, Production Scheduling>
+<Film Scoring, connectedTo, Storyboarding>
+<Insurance Management, connectedTo, Pre_production Planning>
+<Location Scouting, connectedTo, Set Construction>
+<Makeup and Hair Design, connectedTo, Casting>
+<Marketing and Publicity, licenses, Pre_production Planning>
+<Pre_production Planning, connectedTo, Prop Management>
+<Production Scheduling, connectedTo, Cinematography>
+<Prop Management, connectedTo, Location Scouting>
+<Prop Management, connectedTo, Production Scheduling>
+<Remote Collaboration Tools, connectedTo, Talent Negotiation>
+<Screenwriting Workshops, connectedTo, Archiving and Preservation>
+<Script Development, captures, Art Direction>
+<Script Development, connectedTo, Cinematography>
+<Script Development, connectedTo, Film Financing>
+<Script Development, connectedTo, Green Production Practices>
+<Script Development, connectedTo, Prop Management>
+<Script Development, connectedTo, Set Construction>
+<Set Construction, connectedTo, Remote Collaboration Tools>
+<Special Effects, connectedTo, Budget Management>
+<Storyboarding, connectedTo, Special Effects>
+<Talent Negotiation, connectedTo, Green Production Practices>
+<Tax Incentive Management, connectedTo, Digital Asset Management>
diff --git a/test/diagrams/graph_hard/diagrams_178.dot b/test/diagrams/graph_hard/diagrams_178.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6bdfe278dcaf7e54863501d89e4d8813a9845711
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_178.dot
@@ -0,0 +1,85 @@
+digraph {
+	rankdir=BT
+	N0 [label="User_Generated Content Curation" color="#94C0C0" fillcolor="#CADEDE" shape=rectangle style=filled]
+	N1 [label="Monetization Strategy" color="#B0C5CD" fillcolor="#DFE7EB" shape=vnode_shape style=filled]
+	N2 [label="Research and Outline" color="#B0C5CD" fillcolor="#DFE7EB" shape=inputoutput style=filled]
+	N3 [label="Interactive Content Development" color="#94C0C0" fillcolor="#CADEDE" shape=preparation style=filled]
+	N4 [label="Content Localization" color="#94C0C0" fillcolor="#CADEDE" shape=rect style=filled]
+	N5 [label="Newsletter Creation" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+	N6 [label="Fact_Checking" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+	N7 [label="Editing and Proofreading" color="#FFCC7A" fillcolor="#FFF6D9" shape=preparation style=filled]
+	N8 [label="Audience Engagement" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+	N9 [label="Distribution Planning" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N10 [label="Social Media Post Creation" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+	N11 [label="Podcast Production" color="#94C0C0" fillcolor="#CADEDE" shape=predefinedprocess style=filled]
+	N12 [label="Ideation and Brainstorming" color="#FFCC7A" fillcolor="#FFF6D9" shape=parallelogram style=filled]
+	N13 [label="Branding" color="#B0C5CD" fillcolor="#DFE7EB" shape=inputoutput style=filled]
+	N14 [label="Content Repurposing" color="#94C0C0" fillcolor="#CADEDE" shape=preparation style=filled]
+	N15 [label="Performance Tracking" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N16 [label="Photography" color="#94C0C0" fillcolor="#CADEDE" shape=database style=filled]
+	S0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#94C0C0" fillcolor="#CADEDE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Copywriting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Copywriting"
+		nest0_0 [label="Graphic Design" color="#B0C5CD" fillcolor="#DFE7EB" shape=action style=filled]
+		nest0_1 [label="Voice Acting or Narration" color="#94C0C0" fillcolor="#CADEDE" shape=vnode_shape style=filled]
+		nest0_2 [label="Keyword Research" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+		nest0_3 [label="Live Streaming Content" color="#FFCC7A" fillcolor="#FFF6D9" shape=preparation style=filled]
+	}
+	subgraph cluster_Publishing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Publishing"
+		nest1_0 [label="Transcribing Audio or Video" color="#B0C5CD" fillcolor="#DFE7EB" shape=rect style=filled]
+		nest1_1 [label="Call to Action Design" color="#B0C5CD" fillcolor="#DFE7EB" shape=document style=filled]
+		nest1_2 [label="Audio Recording" color="#94C0C0" fillcolor="#CADEDE" shape=document style=filled]
+	}
+	N0 -> N1 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#94C0C0" penwidth=1.5 style=solid label="drafts" dir=forward]
+	N7 -> N8 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#B0C5CD" penwidth=1.5 style=solid label="supports" dir=forward]
+	N13 -> N14 [color="#94C0C0" penwidth=1.5 style=dashed label="measures" dir=forward]
+	N14 -> N15 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest0_0 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N1 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S0 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N11 -> S1 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#000000" penwidth=1.5 style=solid label="illustrates" dir=forward]
+	S1 -> N13 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M2 -> N8 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_178.txt b/test/diagrams/graph_hard/diagrams_178.txt
new file mode 100644
index 0000000000000000000000000000000000000000..279ed3d29015df3bd78a23ca42dc84ee203d0b6f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_178.txt
@@ -0,0 +1,47 @@
+<Audience Engagement, connectedTo, Distribution Planning>
+<Audio Recording, connectedTo, Monetization Strategy>
+<Audio Recording, partOf, Audio Recording>
+<Branding, measures, Content Repurposing>
+<Call to Action Design, connectedTo, Audio Recording>
+<Call to Action Design, partOf, Call to Action Design>
+<Content Localization, connectedTo, Newsletter Creation>
+<Content Localization, connectedTo, Transcribing Audio or Video>
+<Content Repurposing, connectedTo, Performance Tracking>
+<Distribution Planning, connectedTo, Social Media Post Creation>
+<Editing and Proofreading, connectedTo, Audience Engagement>
+<Fact_Checking, drafts, Editing and Proofreading>
+<Graphic Design, connectedTo, Voice Acting or Narration>
+<Graphic Design, partOf, Graphic Design>
+<Ideation and Brainstorming, supports, Branding>
+<Interactive Content Development, connectedTo, Audience Engagement>
+<Interactive Content Development, connectedTo, Content Localization>
+<Keyword Research, connectedTo, Live Streaming Content>
+<Keyword Research, partOf, Keyword Research>
+<Live Streaming Content, connectedTo, Editing and Proofreading>
+<Live Streaming Content, partOf, Live Streaming Content>
+<Monetization Strategy, connectedTo, Audience Engagement>
+<Monetization Strategy, connectedTo, Content Localization>
+<Monetization Strategy, connectedTo, Graphic Design>
+<Monetization Strategy, connectedTo, Research and Outline>
+<Newsletter Creation, connectedTo, Audience Engagement>
+<Newsletter Creation, connectedTo, Branding>
+<Newsletter Creation, connectedTo, Content Repurposing>
+<Newsletter Creation, connectedTo, Editing and Proofreading>
+<Newsletter Creation, connectedTo, Fact_Checking>
+<Newsletter Creation, connectedTo, Performance Tracking>
+<Performance Tracking, connectedTo, Photography>
+<Podcast Production, connectedTo, Branding>
+<Podcast Production, connectedTo, Content Repurposing>
+<Podcast Production, connectedTo, Ideation and Brainstorming>
+<Podcast Production, connectedTo, Performance Tracking>
+<Podcast Production, illustrates, Photography>
+<Research and Outline, connectedTo, Audience Engagement>
+<Research and Outline, connectedTo, Content Localization>
+<Research and Outline, connectedTo, Interactive Content Development>
+<Social Media Post Creation, connectedTo, Podcast Production>
+<Transcribing Audio or Video, connectedTo, Call to Action Design>
+<Transcribing Audio or Video, partOf, Transcribing Audio or Video>
+<User_Generated Content Curation, connectedTo, Content Localization>
+<User_Generated Content Curation, connectedTo, Monetization Strategy>
+<Voice Acting or Narration, connectedTo, Keyword Research>
+<Voice Acting or Narration, partOf, Voice Acting or Narration>
diff --git a/test/diagrams/graph_hard/diagrams_179.txt b/test/diagrams/graph_hard/diagrams_179.txt
new file mode 100644
index 0000000000000000000000000000000000000000..52dd6808e65c15151b9d041a17f6b86cc0da9d47
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_179.txt
@@ -0,0 +1,27 @@
+<Audience Analysis, connectedTo, Audio Recording>
+<Audio Recording, connectedTo, User_Generated Content Curation>
+<Fact_Checking, connectedTo, Audience Analysis>
+<Ideation and Brainstorming, connectedTo, Social Media Post Creation>
+<Ideation and Brainstorming, connectedTo, Video Scripting>
+<Influencer Collaboration, connectedTo, Social Media Post Creation>
+<Influencer Collaboration, interviews, Webinar Hosting>
+<Interactive Content Development, connectedTo, Research and Outline>
+<Interview Conduct, connectedTo, Interactive Content Development>
+<Monetization Strategy, supports, Voice Acting or Narration>
+<Photography, videos, Interview Conduct>
+<Plagiarism Checking, connectedTo, Monetization Strategy>
+<Research and Outline, connectedTo, Videography>
+<Search Engine Optimization, connectedTo, Social Media Post Creation>
+<Social Media Post Creation, connectedTo, Monetization Strategy>
+<Social Media Post Creation, connectedTo, Voice Acting or Narration>
+<Social Media Post Creation, localizes, Plagiarism Checking>
+<User_Generated Content Curation, connectedTo, Social Media Post Creation>
+<Video Scripting, connectedTo, Search Engine Optimization>
+<Video Scripting, connectedTo, Social Media Post Creation>
+<Voice Acting or Narration, connectedTo, Photography>
+<Voice Acting or Narration, connectedTo, Videography>
+<Voice Acting or Narration, curates, Fact_Checking>
+<Webinar Hosting, collaborates, Search Engine Optimization>
+<Webinar Hosting, connectedTo, Ideation and Brainstorming>
+<Webinar Hosting, connectedTo, Plagiarism Checking>
+<Webinar Hosting, connectedTo, Social Media Post Creation>
diff --git a/test/diagrams/graph_hard/diagrams_18.txt b/test/diagrams/graph_hard/diagrams_18.txt
new file mode 100644
index 0000000000000000000000000000000000000000..feada8f386336fba1379d8f8c60467c59505fed1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_18.txt
@@ -0,0 +1,35 @@
+<Air Traffic Control, connectedTo, Fare Calculation>
+<Air Traffic Control, connectedTo, Passenger Boarding Pass Issuance>
+<Air Traffic Control, connectedTo, Road Network Management>
+<Air Traffic Control, connectedTo, Vehicle Tracking>
+<Boarding, connectedTo, Passenger Boarding Pass Issuance>
+<Boarding, connectedTo, Vehicle Assignment>
+<Delay Alert, connectedTo, Boarding>
+<Delay Alert, connectedTo, Passenger Boarding Pass Issuance>
+<Fare Calculation, connectedTo, Maintenance Check>
+<Fare Calculation, connectedTo, Security Check>
+<Fueling, connectedTo, Air Traffic Control>
+<Incident Report, connectedTo, Delay Alert>
+<Intermodal Transfer, connectedTo, Passenger Feedback>
+<Maintenance Check, connectedTo, Schedule Generation>
+<Passenger Boarding Pass Issuance, connectedTo, Fare Calculation>
+<Passenger Feedback, connectedTo, Ride_sharing Request>
+<Ride_sharing Request, connectedTo, Air Traffic Control>
+<Road Network Management, connectedTo, Boarding>
+<Road Network Management, connectedTo, Delay Alert>
+<Road Network Management, connectedTo, Intermodal Transfer>
+<Road Network Management, connectedTo, Passenger Boarding Pass Issuance>
+<Road Network Management, connectedTo, Weather Impact Assessment>
+<Route Optimization, connectedTo, Air Traffic Control>
+<Route Optimization, connectedTo, Fare Calculation>
+<Route Optimization, connectedTo, Road Network Management>
+<Schedule Generation, connectedTo, Fueling>
+<Train Dispatch, connectedTo, Fare Calculation>
+<Train Dispatch, connectedTo, Road Network Management>
+<Vehicle Assignment, connectedTo, Fare Calculation>
+<Vehicle Assignment, connectedTo, Passenger Boarding Pass Issuance>
+<Vehicle Assignment, tracks, Security Check>
+<Vehicle Tracking, connectedTo, Road Network Management>
+<Vehicle Tracking, connectedTo, Train Dispatch>
+<Weather Impact Assessment, connectedTo, Fare Calculation>
+<Weather Impact Assessment, connectedTo, Incident Report>
diff --git a/test/diagrams/graph_hard/diagrams_180.dot b/test/diagrams/graph_hard/diagrams_180.dot
new file mode 100644
index 0000000000000000000000000000000000000000..19064edaaea24adf0b68cbb006a71856cacad323
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_180.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=RL
+	N0 [label="Blog Post Writing" color="#3F51B5" fillcolor="#C5CAE9" shape=preparation style=filled]
+	N1 [label="Research and Outline" color="#388E3C" fillcolor="#C8E6C9" shape=diamond style=filled]
+	N2 [label="E_book Writing" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N3 [label="Fact_Checking" color="#3F51B5" fillcolor="#C5CAE9" shape=preparation style=filled]
+	N4 [label="Content Localization" color="#388E3C" fillcolor="#C8E6C9" shape=action style=filled]
+	N5 [label="Animation" color="#B8C0F5" fillcolor="#ECF0FD" shape=database style=filled]
+	N6 [label="Search Engine Optimization" color="#3F51B5" fillcolor="#C5CAE9" shape=rect style=filled]
+	N7 [label="Editing and Proofreading" color="#388E3C" fillcolor="#C8E6C9" shape=preparation style=filled]
+	N8 [label="Transcribing Audio or Video" color="#3F51B5" fillcolor="#C5CAE9" shape=predefinedprocess style=filled]
+	N9 [label="Drafting Content" color="#388E3C" fillcolor="#C8E6C9" shape=document style=filled]
+	N10 [label="Voice Acting or Narration" color="#3F51B5" fillcolor="#C5CAE9" shape=preparation style=filled]
+	N11 [label="Ideation and Brainstorming" color="#B8C0F5" fillcolor="#ECF0FD" shape=vnode_shape style=filled]
+	N12 [label="Audio Recording" color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Audience Engagement {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Audience Engagement"
+		nest0_0 [label="Publishing" color="#3F51B5" fillcolor="#C5CAE9" shape=rect style=filled]
+		nest0_1 [label="Distribution Planning" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	}
+	subgraph cluster_Keyword Research {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Keyword Research"
+		nest1_0 [label="Interactive Content Development" color="#B8C0F5" fillcolor="#ECF0FD" shape=vnode_shape style=filled]
+		nest1_1 [label="Interview Conduct" color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+		nest1_2 [label="Copywriting" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+		nest1_3 [label="User_Generated Content Curation" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#B8C0F5" penwidth=1.5 style=dashed label="streams" dir=forward]
+	N3 -> N4 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest0_0 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N5 [color="#388E3C" penwidth=1.5 style=dashed label="distributes" dir=forward]
+	nest1_0 -> nest1_1 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#3F51B5" penwidth=1.5 style=dashed label="automates" dir=forward]
+	nest1_2 -> nest1_3 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N1 [color="#3F51B5" penwidth=1.5 style=solid label="animates" dir=forward]
+	N5 -> S0 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N4 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_180.txt b/test/diagrams/graph_hard/diagrams_180.txt
new file mode 100644
index 0000000000000000000000000000000000000000..344f000d69e4259ba15913e96ee5832ba1fcf324
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_180.txt
@@ -0,0 +1,26 @@
+<Animation, connectedTo, Audio Recording>
+<Animation, connectedTo, Ideation and Brainstorming>
+<Animation, connectedTo, Search Engine Optimization>
+<Blog Post Writing, connectedTo, Content Localization>
+<Blog Post Writing, connectedTo, Research and Outline>
+<Content Localization, connectedTo, Animation>
+<Content Localization, connectedTo, Interactive Content Development>
+<Copywriting, connectedTo, User_Generated Content Curation>
+<Distribution Planning, distributes, Animation>
+<Drafting Content, connectedTo, Publishing>
+<Drafting Content, connectedTo, Voice Acting or Narration>
+<E_book Writing, connectedTo, Content Localization>
+<E_book Writing, streams, Fact_Checking>
+<Editing and Proofreading, connectedTo, Transcribing Audio or Video>
+<Fact_Checking, connectedTo, Content Localization>
+<Ideation and Brainstorming, connectedTo, Audio Recording>
+<Interactive Content Development, connectedTo, Interview Conduct>
+<Interview Conduct, automates, Copywriting>
+<Publishing, connectedTo, Distribution Planning>
+<Research and Outline, connectedTo, Content Localization>
+<Research and Outline, connectedTo, E_book Writing>
+<Search Engine Optimization, connectedTo, Drafting Content>
+<Search Engine Optimization, connectedTo, Editing and Proofreading>
+<Transcribing Audio or Video, connectedTo, Drafting Content>
+<User_Generated Content Curation, animates, Research and Outline>
+<Voice Acting or Narration, connectedTo, Ideation and Brainstorming>
diff --git a/test/diagrams/graph_hard/diagrams_181.dot b/test/diagrams/graph_hard/diagrams_181.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7a054db631ce189cb42176a2cf4ebff84dd662b5
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_181.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=BT
+	N0 [label="Marketing Campaign Analysis" color="#FFF9AE" fillcolor="#FFFCE6" shape=multipledocuments style=filled]
+	N1 [label="Natural Language Processing for Data" color="#92C79A" fillcolor="#E8F0EA" shape=database style=filled]
+	N2 [label="Text Analytics" color="#92C79A" fillcolor="#E8F0EA" shape=parallelogram style=filled]
+	N3 [label="ETL Process Management" color="#92C79A" fillcolor="#E8F0EA" shape=database style=filled]
+	N4 [label="Data Collection" color="#92C79A" fillcolor="#E8F0EA" shape=rect style=filled]
+	N5 [label="Big Data Processing" color="#E91E63" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N6 [label="Operational Efficiency Metrics" color="#92C79A" fillcolor="#E8F0EA" shape=document style=filled]
+	N7 [label="Sales Performance Analysis" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N8 [label="Prescriptive Analytics" color="#92C79A" fillcolor="#E8F0EA" shape=rectangle style=filled]
+	N9 [label="Data Quality Assurance" color="#FFF9AE" fillcolor="#FFFCE6" shape=database style=filled]
+	N10 [label="Machine Learning Integration" color="#FFF9AE" fillcolor="#FFFCE6" shape=diamond style=filled]
+	N11 [label="Data Cleaning" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N12 [label="Geospatial Analysis" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N13 [label="Data Warehouse Design" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N14 [label="Data Transformation" color="#E91E63" fillcolor="#FCE4EC" shape=preparation style=filled]
+	N15 [label="Predictive Analytics" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N16 [label="HR Data Analytics" color="#E91E63" fillcolor="#FCE4EC" shape=database style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#92C79A" fillcolor="#E8F0EA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Financial Data Analysis {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Financial Data Analysis"
+		nest0_0 [label="Business User Training on Analytics" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+		nest0_1 [label="Web Analytics" color="#E91E63" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Risk Analytics {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Risk Analytics"
+		nest1_0 [label="Supply Chain Analytics" color="#FFF9AE" fillcolor="#FFFCE6" shape=multipledocuments style=filled]
+		nest1_1 [label="Data Mining" color="#92C79A" fillcolor="#E8F0EA" shape=database style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFF9AE" penwidth=1.5 style=solid label="prepares" dir=forward]
+	N2 -> N3 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed label="validates" dir=forward]
+	N4 -> N5 [color="#FFF9AE" penwidth=1.5 style=dashed label="develops" dir=forward]
+	N5 -> N6 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#92C79A" penwidth=1.5 style=dashed label="communicates" dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> nest0_0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N9 [color="#E91E63" penwidth=1.5 style=solid label="researches" dir=forward]
+	nest1_0 -> nest1_1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N11 -> nest1_0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N8 [color="#E91E63" penwidth=1.5 style=solid label="collects" dir=forward]
+	N5 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N9 -> S2 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N15 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	S2 -> N13 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=dashed label="tracks" dir=forward]
+	M0 -> N5 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_181.txt b/test/diagrams/graph_hard/diagrams_181.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bc33243814a5d87a8a21d2596c1ab8e3b24dd752
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_181.txt
@@ -0,0 +1,33 @@
+<Big Data Processing, connectedTo, Machine Learning Integration>
+<Big Data Processing, connectedTo, Operational Efficiency Metrics>
+<Big Data Processing, connectedTo, Sales Performance Analysis>
+<Business User Training on Analytics, connectedTo, Web Analytics>
+<Data Cleaning, connectedTo, Geospatial Analysis>
+<Data Cleaning, connectedTo, Supply Chain Analytics>
+<Data Collection, develops, Big Data Processing>
+<Data Mining, collects, Prescriptive Analytics>
+<Data Quality Assurance, connectedTo, Data Warehouse Design>
+<Data Quality Assurance, connectedTo, Geospatial Analysis>
+<Data Quality Assurance, connectedTo, Machine Learning Integration>
+<Data Quality Assurance, connectedTo, Predictive Analytics>
+<Data Transformation, connectedTo, Predictive Analytics>
+<Data Warehouse Design, communicates, Data Transformation>
+<ETL Process Management, tracks, Big Data Processing>
+<ETL Process Management, validates, Data Collection>
+<Geospatial Analysis, connectedTo, Data Warehouse Design>
+<Machine Learning Integration, connectedTo, Data Cleaning>
+<Marketing Campaign Analysis, connectedTo, Big Data Processing>
+<Marketing Campaign Analysis, connectedTo, Natural Language Processing for Data>
+<Natural Language Processing for Data, connectedTo, Big Data Processing>
+<Natural Language Processing for Data, connectedTo, Sales Performance Analysis>
+<Natural Language Processing for Data, prepares, Text Analytics>
+<Operational Efficiency Metrics, connectedTo, Data Quality Assurance>
+<Operational Efficiency Metrics, connectedTo, Data Transformation>
+<Operational Efficiency Metrics, connectedTo, Sales Performance Analysis>
+<Predictive Analytics, connectedTo, Business User Training on Analytics>
+<Predictive Analytics, connectedTo, HR Data Analytics>
+<Prescriptive Analytics, connectedTo, Data Quality Assurance>
+<Sales Performance Analysis, connectedTo, Prescriptive Analytics>
+<Supply Chain Analytics, connectedTo, Data Mining>
+<Text Analytics, connectedTo, ETL Process Management>
+<Web Analytics, researches, Data Quality Assurance>
diff --git a/test/diagrams/graph_hard/diagrams_182.dot b/test/diagrams/graph_hard/diagrams_182.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d12134a394150e34a81e404d1b503d228a036de8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_182.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=BT
+	N0 [label="Data Collection" color="#4CAF50" fillcolor="#C8E6C9" shape=vnode_shape style=filled]
+	N1 [label="Operational Efficiency Metrics" color="#4CAF50" fillcolor="#C8E6C9" shape=diamond style=filled]
+	N2 [label="Customer Analytics" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N3 [label="Social Media Analytics" color="#FFC085" fillcolor="#FFDAB9" shape=preparation style=filled]
+	N4 [label="ETL Process Management" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N5 [label="Business User Training on Analytics" color="#FFC085" fillcolor="#FFDAB9" shape=database style=filled]
+	N6 [label="Data Mining" color="#795548" fillcolor="#D7CCC8" shape=document style=filled]
+	N7 [label="Dashboard Creation" color="#4CAF50" fillcolor="#C8E6C9" shape=vnode_shape style=filled]
+	N8 [label="Cloud_based Data Platforms" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N9 [label="Data Quality Assurance" color="#795548" fillcolor="#D7CCC8" shape=rect style=filled]
+	N10 [label="Financial Data Analysis" color="#795548" fillcolor="#D7CCC8" shape=preparation style=filled]
+	N11 [label="Healthcare Data Analysis" color="#795548" fillcolor="#D7CCC8" shape=inputoutput style=filled]
+	N12 [label="Data Pipeline Development" color="#FFC085" fillcolor="#FFDAB9" shape=predefinedprocess style=filled]
+	N13 [label="HR Data Analytics" color="#FFC085" fillcolor="#FFDAB9" shape=rectangle style=filled]
+	N14 [label="Report Generation" color="#FFC085" fillcolor="#FFDAB9" shape=inputoutput style=filled]
+	S0 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Data Storytelling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Data Storytelling"
+		nest0_0 [label="Real_time Analytics" color="#FFC085" fillcolor="#FFDAB9" shape=rect style=filled]
+		nest0_1 [label="Data Cleaning" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+		nest0_2 [label="A or B Testing Analysis" color="#795548" fillcolor="#D7CCC8" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Sentiment Analysis {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Sentiment Analysis"
+		nest1_0 [label="Data Security Best Practices" color="#FFC085" fillcolor="#FFDAB9" shape=preparation style=filled]
+		nest1_1 [label="Data Governance" color="#FFC085" fillcolor="#FFDAB9" shape=parallelogram style=filled]
+		nest1_2 [label="Text Analytics" color="#4CAF50" fillcolor="#C8E6C9" shape=action style=filled]
+	}
+	N0 -> N1 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#4CAF50" penwidth=1.5 style=solid label="processes" dir=forward]
+	nest0_1 -> nest0_2 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N10 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N12 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N9 -> S0 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N0 -> S1 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N6 -> S2 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	S2 -> N9 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M0 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	M0 -> N12 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N8 -> M2 [color="#FFC085" penwidth=1.5 style=solid label="correlates" dir=forward]
+	N3 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_182.txt b/test/diagrams/graph_hard/diagrams_182.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7c20d2acb8b7d90d5c7fdb06765fad84a0fb4c71
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_182.txt
@@ -0,0 +1,34 @@
+<A or B Testing Analysis, connectedTo, Financial Data Analysis>
+<Business User Training on Analytics, connectedTo, Data Mining>
+<Business User Training on Analytics, connectedTo, Financial Data Analysis>
+<Cloud_based Data Platforms, connectedTo, Data Quality Assurance>
+<Cloud_based Data Platforms, correlates, Financial Data Analysis>
+<Customer Analytics, connectedTo, Data Pipeline Development>
+<Customer Analytics, connectedTo, Social Media Analytics>
+<Dashboard Creation, connectedTo, Cloud_based Data Platforms>
+<Dashboard Creation, connectedTo, Data Security Best Practices>
+<Dashboard Creation, connectedTo, Real_time Analytics>
+<Data Cleaning, connectedTo, A or B Testing Analysis>
+<Data Collection, connectedTo, ETL Process Management>
+<Data Collection, connectedTo, HR Data Analytics>
+<Data Collection, connectedTo, Operational Efficiency Metrics>
+<Data Governance, connectedTo, Text Analytics>
+<Data Mining, connectedTo, Cloud_based Data Platforms>
+<Data Mining, connectedTo, Dashboard Creation>
+<Data Mining, connectedTo, Data Quality Assurance>
+<Data Mining, connectedTo, Healthcare Data Analysis>
+<Data Pipeline Development, connectedTo, HR Data Analytics>
+<Data Quality Assurance, connectedTo, Data Pipeline Development>
+<Data Quality Assurance, connectedTo, Financial Data Analysis>
+<Data Quality Assurance, connectedTo, HR Data Analytics>
+<Data Quality Assurance, connectedTo, Report Generation>
+<Data Security Best Practices, connectedTo, Data Governance>
+<ETL Process Management, connectedTo, Business User Training on Analytics>
+<Financial Data Analysis, connectedTo, Healthcare Data Analysis>
+<HR Data Analytics, connectedTo, Report Generation>
+<Healthcare Data Analysis, connectedTo, Data Pipeline Development>
+<Operational Efficiency Metrics, connectedTo, Customer Analytics>
+<Real_time Analytics, processes, Data Cleaning>
+<Social Media Analytics, connectedTo, ETL Process Management>
+<Social Media Analytics, connectedTo, Financial Data Analysis>
+<Text Analytics, connectedTo, Data Pipeline Development>
diff --git a/test/diagrams/graph_hard/diagrams_183.dot b/test/diagrams/graph_hard/diagrams_183.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b4465c686e307bf0f58c55464f3aca9a20b1c540
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_183.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=RL
+	N0 [label="Data Quality Assurance" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N1 [label="Data Warehouse Design" color="#9575CD" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	N2 [label="Data Cleaning" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N3 [label="Web Analytics" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+	N4 [label="Natural Language Processing for Data" color="#5C6BC0" fillcolor="#E8EAF6" shape=inputoutput style=filled]
+	N5 [label="Dashboard Creation" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N6 [label="Financial Data Analysis" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N7 [label="Social Media Analytics" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N8 [label="Data Governance" color="#5C6BC0" fillcolor="#E8EAF6" shape=rectangle style=filled]
+	N9 [label="Data Visualization" color="#9C27B0" fillcolor="#E1BEE7" shape=rectangle style=filled]
+	N10 [label="Prescriptive Analytics" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+	S0 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Real_time Analytics {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Real_time Analytics"
+		nest0_0 [label="Data Pipeline Development" color="#9575CD" fillcolor="#EDE7F6" shape=rect style=filled]
+		nest0_1 [label="Sentiment Analysis" color="#9575CD" fillcolor="#EDE7F6" shape=rect style=filled]
+		nest0_2 [label="Marketing Campaign Analysis" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+		nest0_3 [label="Exploratory Data Analysis" color="#9575CD" fillcolor="#EDE7F6" shape=action style=filled]
+	}
+	subgraph cluster_Geospatial Analysis {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Geospatial Analysis"
+		nest1_0 [label="Predictive Analytics" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+		nest1_1 [label="Report Generation" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+		nest1_2 [label="Time Series Forecasting" color="#5C6BC0" fillcolor="#E8EAF6" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed label="develops" dir=forward]
+	N4 -> nest0_0 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N9 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest1_0 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N6 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S2 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N8 -> M1 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N7 -> M1 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N7 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_184.txt b/test/diagrams/graph_hard/diagrams_184.txt
new file mode 100644
index 0000000000000000000000000000000000000000..070aaff9e339026eae2f53e266ae816b0114213c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_184.txt
@@ -0,0 +1,38 @@
+<Actionable Insights Generation, connectedTo, Data Warehousing>
+<Actionable Insights Generation, connectedTo, Operational Efficiency Measurement>
+<BI Platform Administration, connectedTo, Financial Performance Reporting>
+<Budget Performance Analysis, connectedTo, Embedded Analytics>
+<Budget Performance Analysis, connectedTo, Prescriptive Analytics Implementation>
+<Business Process Improvement, connectedTo, Competitive Analysis>
+<Business Process Improvement, connectedTo, Data Quality Management>
+<Business Process Improvement, connectedTo, Performance Monitoring>
+<Cloud BI Solutions, connectedTo, Data Source Integration>
+<Competitive Analysis, connectedTo, Data Quality Management>
+<Competitive Analysis, connectedTo, ETL Development>
+<Competitive Analysis, connectedTo, Performance Monitoring>
+<Data Mart Design, connectedTo, Real_time BI Dashboards>
+<Data Quality Management, connectedTo, Performance Monitoring>
+<Data Security in BI, connectedTo, Actionable Insights Generation>
+<Data Security in BI, connectedTo, Cloud BI Solutions>
+<Data Security in BI, connectedTo, Data Source Integration>
+<Data Security in BI, connectedTo, Operational Efficiency Measurement>
+<Data Security in BI, connectedTo, Supply Chain Optimization>
+<Data Warehousing, connectedTo, Regulatory Compliance Reporting>
+<ETL Development, connectedTo, Data Quality Management>
+<ETL Development, connectedTo, Performance Monitoring>
+<Embedded Analytics, connectedTo, OLAP Cube Creation>
+<Executive Summary Reporting, connectedTo, Budget Performance Analysis>
+<Financial Performance Reporting, connectedTo, Data Source Integration>
+<Financial Performance Reporting, connectedTo, Executive Summary Reporting>
+<Financial Performance Reporting, connectedTo, Supply Chain Optimization>
+<KPI Definition, connectedTo, Query Optimization>
+<Master Data Management, connectedTo, Data Security in BI>
+<OLAP Cube Creation, connectedTo, Master Data Management>
+<Operational Efficiency Measurement, connectedTo, Supply Chain Optimization>
+<Performance Monitoring, connectedTo, Data Mart Design>
+<Prescriptive Analytics Implementation, connectedTo, KPI Definition>
+<Query Optimization, connectedTo, BI Platform Administration>
+<Real_time BI Dashboards, connectedTo, BI Platform Administration>
+<Regulatory Compliance Reporting, connectedTo, Strategic Planning Support>
+<Strategic Planning Support, connectedTo, Data Mart Design>
+<Supply Chain Optimization, connectedTo, Cloud BI Solutions>
diff --git a/test/diagrams/graph_hard/diagrams_185.dot b/test/diagrams/graph_hard/diagrams_185.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3e4d962d2f3f9183c7165c1d2c1fc2fd98fe4c59
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_185.dot
@@ -0,0 +1,83 @@
+digraph {
+	rankdir=RL
+	N0 [label="Competitive Analysis" color="#6FE1D5" fillcolor="#C9EFEC" shape=multipledocuments style=filled]
+	N1 [label="Data Lineage Tracking" color="#6FE1D5" fillcolor="#C9EFEC" shape=predefinedprocess style=filled]
+	N2 [label="Data Source Integration" color="#6FE1D5" fillcolor="#C9EFEC" shape=rect style=filled]
+	N3 [label="Master Data Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=predefinedprocess style=filled]
+	N4 [label="Regulatory Compliance Reporting" color="#FFCC80" fillcolor="#FFF0CC" shape=preparation style=filled]
+	N5 [label="ETL Development" color="#FFCC80" fillcolor="#FFF0CC" shape=action style=filled]
+	N6 [label="HR Analytics Dashboards" color="#FFCC80" fillcolor="#FFF0CC" shape=vnode_shape style=filled]
+	N7 [label="User Training and Support" color="#FFC107" fillcolor="#FFECB3" shape=document style=filled]
+	N8 [label="Cloud BI Solutions" color="#FFCC80" fillcolor="#FFF0CC" shape=preparation style=filled]
+	N9 [label="Data Security in BI" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N10 [label="Executive Summary Reporting" color="#FFCC80" fillcolor="#FFF0CC" shape=vnode_shape style=filled]
+	N11 [label="Data Quality Management" color="#FFCC80" fillcolor="#FFF0CC" shape=rect style=filled]
+	N12 [label="BI Platform Administration" color="#FFCC80" fillcolor="#FFF0CC" shape=inputoutput style=filled]
+	N13 [label="Business Process Improvement" color="#FFC107" fillcolor="#FFECB3" shape=database style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFC107" fillcolor="#FFECB3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFCC80" fillcolor="#FFF0CC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFCC80" fillcolor="#FFF0CC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Data Mart Design {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Data Mart Design"
+		nest0_0 [label="Supply Chain Optimization" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+		nest0_1 [label="Report Automation" color="#FFC107" fillcolor="#FFECB3" shape=action style=filled]
+		nest0_2 [label="Actionable Insights Generation" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	}
+	subgraph cluster_Query Optimization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Query Optimization"
+		nest1_0 [label="Market Trend Analysis" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+		nest1_1 [label="Real_time BI Dashboards" color="#FFCC80" fillcolor="#FFF0CC" shape=predefinedprocess style=filled]
+		nest1_2 [label="KPI Definition" color="#6FE1D5" fillcolor="#C9EFEC" shape=rect style=filled]
+		nest1_3 [label="Financial Performance Reporting" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	}
+	N0 -> N1 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFC107" penwidth=1.5 style=dashed label="designs" dir=forward]
+	N4 -> N5 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#6FE1D5" penwidth=1.5 style=solid label="defines" dir=forward]
+	N11 -> N12 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N6 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N3 -> S1 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> S2 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	S2 -> N11 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	S2 -> N12 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=dashed label="forecasts" dir=forward]
+	N7 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N10 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N6 -> M1 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M2 -> N4 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_185.txt b/test/diagrams/graph_hard/diagrams_185.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8a5f9d6f890c563f2b765239328b2727c0f0777f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_185.txt
@@ -0,0 +1,36 @@
+<Actionable Insights Generation, connectedTo, Data Quality Management>
+<BI Platform Administration, connectedTo, Business Process Improvement>
+<BI Platform Administration, connectedTo, Market Trend Analysis>
+<Cloud BI Solutions, connectedTo, Data Security in BI>
+<Cloud BI Solutions, connectedTo, Executive Summary Reporting>
+<Competitive Analysis, connectedTo, Data Lineage Tracking>
+<Competitive Analysis, connectedTo, Regulatory Compliance Reporting>
+<Data Lineage Tracking, connectedTo, Data Source Integration>
+<Data Lineage Tracking, connectedTo, Regulatory Compliance Reporting>
+<Data Quality Management, connectedTo, BI Platform Administration>
+<Data Security in BI, connectedTo, BI Platform Administration>
+<Data Security in BI, connectedTo, Data Quality Management>
+<Data Security in BI, connectedTo, Executive Summary Reporting>
+<Data Source Integration, connectedTo, Executive Summary Reporting>
+<Data Source Integration, connectedTo, Master Data Management>
+<Data Source Integration, connectedTo, Regulatory Compliance Reporting>
+<ETL Development, connectedTo, HR Analytics Dashboards>
+<Executive Summary Reporting, defines, Data Quality Management>
+<Financial Performance Reporting, connectedTo, HR Analytics Dashboards>
+<HR Analytics Dashboards, connectedTo, Executive Summary Reporting>
+<HR Analytics Dashboards, connectedTo, Supply Chain Optimization>
+<HR Analytics Dashboards, connectedTo, User Training and Support>
+<KPI Definition, connectedTo, Financial Performance Reporting>
+<Market Trend Analysis, connectedTo, Real_time BI Dashboards>
+<Master Data Management, connectedTo, BI Platform Administration>
+<Master Data Management, connectedTo, Business Process Improvement>
+<Master Data Management, connectedTo, Cloud BI Solutions>
+<Master Data Management, connectedTo, User Training and Support>
+<Master Data Management, designs, Regulatory Compliance Reporting>
+<Real_time BI Dashboards, connectedTo, KPI Definition>
+<Regulatory Compliance Reporting, connectedTo, ETL Development>
+<Regulatory Compliance Reporting, forecasts, Executive Summary Reporting>
+<Report Automation, connectedTo, Actionable Insights Generation>
+<Supply Chain Optimization, connectedTo, Report Automation>
+<User Training and Support, connectedTo, Cloud BI Solutions>
+<User Training and Support, connectedTo, Executive Summary Reporting>
diff --git a/test/diagrams/graph_hard/diagrams_186.txt b/test/diagrams/graph_hard/diagrams_186.txt
new file mode 100644
index 0000000000000000000000000000000000000000..92c89a38abf95fd6141003ba0ae7ec0ed35f423c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_186.txt
@@ -0,0 +1,27 @@
+<Actionable Insights Generation, manages, Regulatory Compliance Reporting>
+<Cloud BI Solutions, connectedTo, Customer Behavior Insights>
+<Cloud BI Solutions, connectedTo, Data Mart Design>
+<Cloud BI Solutions, connectedTo, Query Optimization>
+<Cloud BI Solutions, connectedTo, Sales Forecasting>
+<Cloud BI Solutions, connectedTo, Supply Chain Optimization>
+<Cloud BI Solutions, monitors, Data Storytelling for Business>
+<Customer Behavior Insights, connectedTo, Data Lineage Tracking>
+<Customer Behavior Insights, connectedTo, Real_time BI Dashboards>
+<Data Lineage Tracking, connectedTo, Sales Forecasting>
+<Data Mart Design, connectedTo, Prescriptive Analytics Implementation>
+<Data Quality Management, connectedTo, Query Optimization>
+<Data Security in BI, connectedTo, Supply Chain Optimization>
+<Data Security in BI, optimizes, Risk Assessment Reporting>
+<Data Source Integration, connectedTo, Data Mart Design>
+<Data Storytelling for Business, connectedTo, Data Security in BI>
+<Prescriptive Analytics Implementation, connectedTo, Data Lineage Tracking>
+<Prescriptive Analytics Implementation, connectedTo, Supply Chain Optimization>
+<Prescriptive Analytics Implementation, deploys, Data Security in BI>
+<Prescriptive Analytics Implementation, supports, Data Storytelling for Business>
+<Query Optimization, connectedTo, Data Source Integration>
+<Query Optimization, self_serves, Data Mart Design>
+<Real_time BI Dashboards, connectedTo, Data Quality Management>
+<Regulatory Compliance Reporting, connectedTo, Data Mart Design>
+<Risk Assessment Reporting, connectedTo, Actionable Insights Generation>
+<Supply Chain Optimization, connectedTo, Customer Behavior Insights>
+<Supply Chain Optimization, connectedTo, Data Lineage Tracking>
diff --git a/test/diagrams/graph_hard/diagrams_187.dot b/test/diagrams/graph_hard/diagrams_187.dot
new file mode 100644
index 0000000000000000000000000000000000000000..799fb8408f1fb5559ca137ca4067af7bbefc0227
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_187.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=TB
+	N0 [label="Brand Strategy Development" color="#FFC107" fillcolor="#FFECB3" shape=rect style=filled]
+	N1 [label="Direct Mail Marketing" color="#388E3C" fillcolor="#C8E6C9" shape=action style=filled]
+	N2 [label="Public Relations" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N3 [label="Search Engine Marketing" color="#388E3C" fillcolor="#C8E6C9" shape=document style=filled]
+	N4 [label="Product Launch Strategy" color="#FFC107" fillcolor="#FFECB3" shape=inputoutput style=filled]
+	N5 [label="Marketing Budget Allocation" color="#FFC107" fillcolor="#FFECB3" shape=action style=filled]
+	N6 [label="Target Audience Identification" color="#388E3C" fillcolor="#C8E6C9" shape=inputoutput style=filled]
+	N7 [label="Podcast Marketing" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N8 [label="Affiliate Marketing" color="#795548" fillcolor="#D7CCC8" shape=rect style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Social Media Marketing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Social Media Marketing"
+		nest0_0 [label="Distribution Channel Management" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+		nest0_1 [label="Guerilla Marketing" color="#795548" fillcolor="#D7CCC8" shape=diamond style=filled]
+		nest0_2 [label="Marketing Analytics" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	}
+	subgraph cluster_Experiential Marketing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Experiential Marketing"
+		nest1_0 [label="Search Engine Optimization" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+		nest1_1 [label="Content Marketing" color="#388E3C" fillcolor="#C8E6C9" shape=multipledocuments style=filled]
+		nest1_2 [label="A or B Testing for Marketing" color="#795548" fillcolor="#D7CCC8" shape=vnode_shape style=filled]
+		nest1_3 [label="Personalization Strategies" color="#388E3C" fillcolor="#C8E6C9" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed label="manages affiliates" dir=forward]
+	nest0_1 -> nest0_2 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest1_0 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N3 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_187.txt b/test/diagrams/graph_hard/diagrams_187.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bc80ba6edd4111dc0af9119b1c71276990d824bc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_187.txt
@@ -0,0 +1,24 @@
+<A or B Testing for Marketing, connectedTo, Personalization Strategies>
+<Brand Strategy Development, connectedTo, Direct Mail Marketing>
+<Brand Strategy Development, connectedTo, Podcast Marketing>
+<Content Marketing, connectedTo, A or B Testing for Marketing>
+<Direct Mail Marketing, connectedTo, Affiliate Marketing>
+<Direct Mail Marketing, connectedTo, Marketing Budget Allocation>
+<Direct Mail Marketing, connectedTo, Podcast Marketing>
+<Direct Mail Marketing, connectedTo, Product Launch Strategy>
+<Direct Mail Marketing, connectedTo, Public Relations>
+<Direct Mail Marketing, connectedTo, Search Engine Marketing>
+<Distribution Channel Management, manages affiliates, Guerilla Marketing>
+<Guerilla Marketing, connectedTo, Marketing Analytics>
+<Marketing Analytics, connectedTo, Search Engine Marketing>
+<Marketing Budget Allocation, connectedTo, Target Audience Identification>
+<Personalization Strategies, connectedTo, Direct Mail Marketing>
+<Podcast Marketing, connectedTo, Affiliate Marketing>
+<Product Launch Strategy, connectedTo, Marketing Budget Allocation>
+<Public Relations, connectedTo, Distribution Channel Management>
+<Public Relations, connectedTo, Search Engine Marketing>
+<Search Engine Marketing, connectedTo, Podcast Marketing>
+<Search Engine Marketing, connectedTo, Product Launch Strategy>
+<Search Engine Optimization, connectedTo, Content Marketing>
+<Target Audience Identification, connectedTo, Podcast Marketing>
+<Target Audience Identification, connectedTo, Search Engine Optimization>
diff --git a/test/diagrams/graph_hard/diagrams_188.dot b/test/diagrams/graph_hard/diagrams_188.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1204d0fc50d3a7361ab52700bea738b6bfe225cc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_188.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=BT
+	N0 [label="Influencer Marketing" color="#00BCD4" fillcolor="#B2EBF2" shape=preparation style=filled]
+	N1 [label="Event Marketing" color="#DCE775" fillcolor="#FCFCE7" shape=vnode_shape style=filled]
+	N2 [label="Customer Segmentation" color="#7E57C2" fillcolor="#D1C4E9" shape=database style=filled]
+	N3 [label="Video Marketing" color="#7E57C2" fillcolor="#D1C4E9" shape=preparation style=filled]
+	N4 [label="Remarketing Campaigns" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N5 [label="Personalization Strategies" color="#7E57C2" fillcolor="#D1C4E9" shape=rectangle style=filled]
+	N6 [label="Competitive Analysis" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N7 [label="Website Design and Optimization" color="#00BCD4" fillcolor="#B2EBF2" shape=preparation style=filled]
+	N8 [label="Search Engine Optimization" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N9 [label="Promotional Campaigns" color="#DCE775" fillcolor="#FCFCE7" shape=preparation style=filled]
+	N10 [label="Partnership Marketing" color="#00BCD4" fillcolor="#B2EBF2" shape=parallelogram style=filled]
+	S0 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#DCE775" fillcolor="#FCFCE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Experiential Marketing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Experiential Marketing"
+		nest0_0 [label="Loyalty Programs" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest0_1 [label="Target Audience Identification" color="#7E57C2" fillcolor="#D1C4E9" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Podcast Marketing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Podcast Marketing"
+		nest1_0 [label="Direct Mail Marketing" color="#DCE775" fillcolor="#FCFCE7" shape=action style=filled]
+		nest1_1 [label="Market Research" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#7E57C2" penwidth=1.5 style=dashed label="generates leads" dir=forward]
+	N5 -> N6 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed label="researches" dir=forward]
+	N4 -> nest0_0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N6 [color="#00BCD4" penwidth=1.5 style=dashed label="manages affiliates" dir=forward]
+	nest1_0 -> nest1_1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N5 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N2 -> S2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#DCE775" penwidth=1.5 style=solid label="segments audiences" dir=forward]
+	S2 -> N8 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M0 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N9 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_188.txt b/test/diagrams/graph_hard/diagrams_188.txt
new file mode 100644
index 0000000000000000000000000000000000000000..479574769157d1bdda371f0881d378225e69fdcb
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_188.txt
@@ -0,0 +1,25 @@
+<Competitive Analysis, connectedTo, Website Design and Optimization>
+<Customer Segmentation, connectedTo, Partnership Marketing>
+<Customer Segmentation, connectedTo, Search Engine Optimization>
+<Customer Segmentation, connectedTo, Video Marketing>
+<Customer Segmentation, segments audiences, Website Design and Optimization>
+<Direct Mail Marketing, connectedTo, Market Research>
+<Event Marketing, connectedTo, Competitive Analysis>
+<Event Marketing, connectedTo, Customer Segmentation>
+<Event Marketing, connectedTo, Personalization Strategies>
+<Event Marketing, connectedTo, Promotional Campaigns>
+<Event Marketing, connectedTo, Search Engine Optimization>
+<Influencer Marketing, connectedTo, Event Marketing>
+<Loyalty Programs, researches, Target Audience Identification>
+<Market Research, connectedTo, Personalization Strategies>
+<Personalization Strategies, connectedTo, Competitive Analysis>
+<Personalization Strategies, connectedTo, Promotional Campaigns>
+<Promotional Campaigns, connectedTo, Direct Mail Marketing>
+<Promotional Campaigns, connectedTo, Partnership Marketing>
+<Remarketing Campaigns, connectedTo, Loyalty Programs>
+<Remarketing Campaigns, generates leads, Personalization Strategies>
+<Search Engine Optimization, connectedTo, Promotional Campaigns>
+<Target Audience Identification, manages affiliates, Competitive Analysis>
+<Video Marketing, connectedTo, Remarketing Campaigns>
+<Website Design and Optimization, connectedTo, Promotional Campaigns>
+<Website Design and Optimization, connectedTo, Search Engine Optimization>
diff --git a/test/diagrams/graph_hard/diagrams_189.dot b/test/diagrams/graph_hard/diagrams_189.dot
new file mode 100644
index 0000000000000000000000000000000000000000..66e0cfdd88cf8c1b05a2b11cf35a257649868ba9
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_189.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=BT
+	N0 [label="Promotional Campaigns" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N1 [label="Marketing Automation" color="#CD8FF2" fillcolor="#ECCFF5" shape=vnode_shape style=filled]
+	N2 [label="Distribution Channel Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=predefinedprocess style=filled]
+	N3 [label="Lead Generation" color="#CD8FF2" fillcolor="#ECCFF5" shape=rectangle style=filled]
+	N4 [label="Search Engine Optimization" color="#CDDC39" fillcolor="#E6EE9C" shape=rectangle style=filled]
+	N5 [label="Telemarketing" color="#FF9800" fillcolor="#FFE0B2" shape=database style=filled]
+	N6 [label="Direct Mail Marketing" color="#CD8FF2" fillcolor="#ECCFF5" shape=rectangle style=filled]
+	N7 [label="Public Relations" color="#CDDC39" fillcolor="#E6EE9C" shape=document style=filled]
+	N8 [label="Brand Strategy Development" color="#CDDC39" fillcolor="#E6EE9C" shape=parallelogram style=filled]
+	N9 [label="Competitive Analysis" color="#CD8FF2" fillcolor="#ECCFF5" shape=vnode_shape style=filled]
+	N10 [label="Customer Journey Mapping" color="#CDDC39" fillcolor="#E6EE9C" shape=predefinedprocess style=filled]
+	N11 [label="Marketing Budget Allocation" color="#CD8FF2" fillcolor="#ECCFF5" shape=rectangle style=filled]
+	N12 [label="Loyalty Programs" color="#CDDC39" fillcolor="#E6EE9C" shape=parallelogram style=filled]
+	S0 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Website Design and Optimization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Website Design and Optimization"
+		nest0_0 [label="Influencer Marketing" color="#CDDC39" fillcolor="#E6EE9C" shape=vnode_shape style=filled]
+		nest0_1 [label="Video Marketing" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	}
+	subgraph cluster_Campaign Performance Tracking {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Campaign Performance Tracking"
+		nest1_0 [label="Product Launch Strategy" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+		nest1_1 [label="Marketing Analytics" color="#CDDC39" fillcolor="#E6EE9C" shape=document style=filled]
+		nest1_2 [label="Brand Reputation Management" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+		nest1_3 [label="Social Media Marketing" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#CDDC39" penwidth=1.5 style=dashed label="sends emails" dir=forward]
+	N11 -> N12 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N10 -> nest0_0 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N12 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N2 -> S0 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N4 [color="#FF9800" penwidth=1.5 style=dashed label="direct mail" dir=forward]
+	S0 -> N8 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S1 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=dashed label="maps customer journeys" dir=forward]
+	S1 -> N10 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#CDDC39" penwidth=1.5 style=dashed label="forms partnerships" dir=forward]
+	N1 -> M0 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#CD8FF2" penwidth=1.5 style=dashed label="builds loyalty" dir=forward]
+	M0 -> N5 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N6 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	M1 -> N12 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_189.txt b/test/diagrams/graph_hard/diagrams_189.txt
new file mode 100644
index 0000000000000000000000000000000000000000..81a59804a5d2f8bbac8a57c36dcbd95b32ad7397
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_189.txt
@@ -0,0 +1,31 @@
+<Brand Reputation Management, connectedTo, Social Media Marketing>
+<Brand Strategy Development, connectedTo, Competitive Analysis>
+<Brand Strategy Development, connectedTo, Product Launch Strategy>
+<Competitive Analysis, connectedTo, Customer Journey Mapping>
+<Customer Journey Mapping, connectedTo, Influencer Marketing>
+<Customer Journey Mapping, sends emails, Marketing Budget Allocation>
+<Direct Mail Marketing, connectedTo, Loyalty Programs>
+<Direct Mail Marketing, connectedTo, Public Relations>
+<Distribution Channel Management, connectedTo, Brand Strategy Development>
+<Distribution Channel Management, connectedTo, Lead Generation>
+<Distribution Channel Management, direct mail, Search Engine Optimization>
+<Influencer Marketing, connectedTo, Video Marketing>
+<Lead Generation, connectedTo, Search Engine Optimization>
+<Lead Generation, connectedTo, Telemarketing>
+<Marketing Analytics, connectedTo, Brand Reputation Management>
+<Marketing Automation, connectedTo, Distribution Channel Management>
+<Marketing Automation, connectedTo, Telemarketing>
+<Marketing Budget Allocation, connectedTo, Loyalty Programs>
+<Product Launch Strategy, connectedTo, Marketing Analytics>
+<Promotional Campaigns, builds loyalty, Telemarketing>
+<Promotional Campaigns, connectedTo, Loyalty Programs>
+<Promotional Campaigns, connectedTo, Marketing Automation>
+<Public Relations, connectedTo, Brand Strategy Development>
+<Public Relations, connectedTo, Customer Journey Mapping>
+<Public Relations, forms partnerships, Competitive Analysis>
+<Public Relations, maps customer journeys, Loyalty Programs>
+<Search Engine Optimization, connectedTo, Loyalty Programs>
+<Search Engine Optimization, connectedTo, Telemarketing>
+<Social Media Marketing, connectedTo, Loyalty Programs>
+<Telemarketing, connectedTo, Direct Mail Marketing>
+<Video Marketing, connectedTo, Marketing Automation>
diff --git a/test/diagrams/graph_hard/diagrams_19.dot b/test/diagrams/graph_hard/diagrams_19.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cc2b4965c9e3bc69103a419dd4b3084d6a6a168f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_19.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=BT
+	N0 [label="Sensor Reading" color="#DCE775" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	N1 [label="Substation Automation" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N2 [label="Outage Detection" color="#9C27B0" fillcolor="#E1BEE7" shape=diamond style=filled]
+	N3 [label="Energy Trading" color="#DCE775" fillcolor="#F9FBE7" shape=database style=filled]
+	N4 [label="Regulatory Compliance" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+	N5 [label="Power Plant" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N6 [label="Circuit Breaker Operation" color="#9C27B0" fillcolor="#E1BEE7" shape=inputoutput style=filled]
+	N7 [label="Grid Modernization" color="#6EB76D" fillcolor="#E9F7E8" shape=hexagon style=filled]
+	N8 [label="Solar Panel Installation" color="#DCE775" fillcolor="#F9FBE7" shape=document style=filled]
+	N9 [label="Energy Efficiency Audit" color="#DCE775" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	N10 [label="Hydropower Generation" color="#DCE775" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N11 [label="Oil and Gas Exploration" color="#6EB76D" fillcolor="#E9F7E8" shape=multipledocuments style=filled]
+	N12 [label="Carbon Capture" color="#6EB76D" fillcolor="#E9F7E8" shape=rectangle style=filled]
+	N13 [label="Generator Check" color="#DCE775" fillcolor="#F9FBE7" shape=vnode_shape style=filled]
+	N14 [label="Geothermal Power" color="#DCE775" fillcolor="#F9FBE7" shape=preparation style=filled]
+	N15 [label="Cybersecurity for Grid" color="#DCE775" fillcolor="#F9FBE7" shape=rect style=filled]
+	N16 [label="Pipeline Monitoring" color="#DCE775" fillcolor="#F9FBE7" shape=diamond style=filled]
+	S0 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Nuclear Reactor Control {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Nuclear Reactor Control"
+		nest0_0 [label="Energy Market Analysis" color="#9C27B0" fillcolor="#E1BEE7" shape=document style=filled]
+		nest0_1 [label="Consumption Logging" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+		nest0_2 [label="Smart Metering" color="#DCE775" fillcolor="#F9FBE7" shape=rectangle style=filled]
+	}
+	subgraph cluster_Alert Dispatch {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Alert Dispatch"
+		nest1_0 [label="Voltage Regulation" color="#DCE775" fillcolor="#F9FBE7" shape=rect style=filled]
+		nest1_1 [label="Wind Turbine Monitoring" color="#DCE775" fillcolor="#F9FBE7" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#DCE775" penwidth=1.5 style=dashed label="trades" dir=forward]
+	N6 -> N7 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N14 -> nest0_0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N16 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N16 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N16 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N11 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M1 [color="#000000" penwidth=1.5 style=solid label="consumes" dir=forward]
+	N8 -> M1 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	M1 -> N11 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_191.dot b/test/diagrams/graph_hard/diagrams_191.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3dac39045f0343501cb26d529243ea7447f87242
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_191.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=BT
+	N0 [label="Campaign Planning" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N1 [label="Print Advertising" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N2 [label="Visual Design for Ads" color="#6FE1D5" fillcolor="#C9EFEC" shape=preparation style=filled]
+	N3 [label="Fraud Detection in Ads" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N4 [label="Outdoor Advertising" color="#6FE1D5" fillcolor="#C9EFEC" shape=action style=filled]
+	N5 [label="Performance Tracking" color="#AB47BC" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N6 [label="Ad Analytics Reporting" color="#AB47BC" fillcolor="#F3E5F5" shape=multipledocuments style=filled]
+	N7 [label="Conversion Tracking" color="#6FE1D5" fillcolor="#C9EFEC" shape=diamond style=filled]
+	N8 [label="Customer Acquisition Cost Analysis" color="#6FE1D5" fillcolor="#C9EFEC" shape=database style=filled]
+	N9 [label="Video Advertising" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N10 [label="Radio Advertising" color="#6FE1D5" fillcolor="#C9EFEC" shape=diamond style=filled]
+	N11 [label="Audience Targeting" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N12 [label="Digital Advertising" color="#6FE1D5" fillcolor="#C9EFEC" shape=database style=filled]
+	N13 [label="Budget Management" color="#AB47BC" fillcolor="#F3E5F5" shape=rectangle style=filled]
+	N14 [label="Programmatic Advertising" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N15 [label="Privacy Concerns in Ads" color="#8C9EFF" fillcolor="#D3D7EB" shape=rectangle style=filled]
+	N16 [label="Geo_Targeting" color="#6FE1D5" fillcolor="#C9EFEC" shape=database style=filled]
+	N17 [label="Display Advertising" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	S0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AB47BC" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AB47BC" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Search Engine Ads {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Search Engine Ads"
+		nest0_0 [label="Native Advertising" color="#8C9EFF" fillcolor="#D3D7EB" shape=preparation style=filled]
+		nest0_1 [label="Television Advertising" color="#8C9EFF" fillcolor="#D3D7EB" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Media Buying {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Media Buying"
+		nest1_0 [label="Interactive Ad Formats" color="#AB47BC" fillcolor="#F3E5F5" shape=multipledocuments style=filled]
+		nest1_1 [label="Ad Creative Development" color="#6FE1D5" fillcolor="#C9EFEC" shape=database style=filled]
+	}
+	N0 -> N1 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest0_0 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N7 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N10 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S0 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> S1 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M0 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N11 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N17 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N10 -> M2 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N13 -> M2 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M2 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	M2 -> N15 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_191.txt b/test/diagrams/graph_hard/diagrams_191.txt
new file mode 100644
index 0000000000000000000000000000000000000000..077231ce5bddcc493eeb9e5a733cf9183ec5d93a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_191.txt
@@ -0,0 +1,36 @@
+<Ad Analytics Reporting, connectedTo, Budget Management>
+<Ad Analytics Reporting, connectedTo, Conversion Tracking>
+<Ad Analytics Reporting, connectedTo, Programmatic Advertising>
+<Ad Creative Development, connectedTo, Radio Advertising>
+<Audience Targeting, connectedTo, Digital Advertising>
+<Audience Targeting, connectedTo, Display Advertising>
+<Budget Management, connectedTo, Privacy Concerns in Ads>
+<Budget Management, connectedTo, Programmatic Advertising>
+<Campaign Planning, connectedTo, Print Advertising>
+<Conversion Tracking, connectedTo, Audience Targeting>
+<Conversion Tracking, connectedTo, Budget Management>
+<Conversion Tracking, connectedTo, Customer Acquisition Cost Analysis>
+<Conversion Tracking, connectedTo, Display Advertising>
+<Customer Acquisition Cost Analysis, connectedTo, Privacy Concerns in Ads>
+<Customer Acquisition Cost Analysis, connectedTo, Video Advertising>
+<Digital Advertising, connectedTo, Budget Management>
+<Fraud Detection in Ads, connectedTo, Conversion Tracking>
+<Fraud Detection in Ads, connectedTo, Display Advertising>
+<Fraud Detection in Ads, connectedTo, Outdoor Advertising>
+<Geo_Targeting, connectedTo, Display Advertising>
+<Interactive Ad Formats, connectedTo, Ad Creative Development>
+<Native Advertising, connectedTo, Television Advertising>
+<Outdoor Advertising, connectedTo, Performance Tracking>
+<Performance Tracking, connectedTo, Ad Analytics Reporting>
+<Performance Tracking, connectedTo, Conversion Tracking>
+<Print Advertising, connectedTo, Privacy Concerns in Ads>
+<Print Advertising, connectedTo, Visual Design for Ads>
+<Privacy Concerns in Ads, connectedTo, Geo_Targeting>
+<Programmatic Advertising, connectedTo, Privacy Concerns in Ads>
+<Radio Advertising, connectedTo, Audience Targeting>
+<Radio Advertising, connectedTo, Privacy Concerns in Ads>
+<Television Advertising, connectedTo, Conversion Tracking>
+<Video Advertising, connectedTo, Interactive Ad Formats>
+<Video Advertising, connectedTo, Native Advertising>
+<Video Advertising, connectedTo, Radio Advertising>
+<Visual Design for Ads, connectedTo, Fraud Detection in Ads>
diff --git a/test/diagrams/graph_hard/diagrams_192.dot b/test/diagrams/graph_hard/diagrams_192.dot
new file mode 100644
index 0000000000000000000000000000000000000000..00ccb5294c6430a146ea08c8e8c394586d2ab6b7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_192.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=BT
+	N0 [label="Display Advertising" color="#9FA9E1" fillcolor="#D6D9F0" shape=preparation style=filled]
+	N1 [label="Conversion Tracking" color="#3F51B5" fillcolor="#C5CAE9" shape=inputoutput style=filled]
+	N2 [label="Brand Awareness Campaigns" color="#2196F3" fillcolor="#BBDEFB" shape=predefinedprocess style=filled]
+	N3 [label="Retargeting Campaigns" color="#2196F3" fillcolor="#BBDEFB" shape=multipledocuments style=filled]
+	N4 [label="Audience Targeting" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+	N5 [label="Campaign Planning" color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+	N6 [label="A or B Testing for Ads" color="#2196F3" fillcolor="#BBDEFB" shape=predefinedprocess style=filled]
+	N7 [label="Radio Advertising" color="#2196F3" fillcolor="#BBDEFB" shape=rectangle style=filled]
+	N8 [label="Print Advertising" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+	N9 [label="Return on Ad Spend Calculation" color="#2196F3" fillcolor="#BBDEFB" shape=predefinedprocess style=filled]
+	N10 [label="Privacy Concerns in Ads" color="#3F51B5" fillcolor="#C5CAE9" shape=document style=filled]
+	N11 [label="Media Buying" color="#9FA9E1" fillcolor="#D6D9F0" shape=vnode_shape style=filled]
+	N12 [label="Direct Response Campaigns" color="#9FA9E1" fillcolor="#D6D9F0" shape=database style=filled]
+	S0 [label="" color="#2196F3" fillcolor="#BBDEFB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Search Engine Ads {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Search Engine Ads"
+		nest0_0 [label="Psychographic Targeting" color="#3F51B5" fillcolor="#C5CAE9" shape=database style=filled]
+		nest0_1 [label="Regulatory Compliance for Ads" color="#2196F3" fillcolor="#BBDEFB" shape=rect style=filled]
+		nest0_2 [label="Programmatic Advertising" color="#9FA9E1" fillcolor="#D6D9F0" shape=rect style=filled]
+		nest0_3 [label="Outdoor Advertising" color="#3F51B5" fillcolor="#C5CAE9" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Ad Platform Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Ad Platform Management"
+		nest1_0 [label="Native Advertising" color="#2196F3" fillcolor="#BBDEFB" shape=vnode_shape style=filled]
+		nest1_1 [label="Demographic Targeting" color="#3F51B5" fillcolor="#C5CAE9" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#3F51B5" penwidth=1.5 style=dashed label="targets audiences" dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest0_0 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N2 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest1_0 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N9 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#2196F3" penwidth=1.5 style=solid label="manages ad networks" dir=forward]
+	S0 -> N8 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S1 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S2 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N10 -> M0 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N9 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N12 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N12 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_192.txt b/test/diagrams/graph_hard/diagrams_192.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0025feef44150c58b4fa22e258bb50bf79c842c0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_192.txt
@@ -0,0 +1,34 @@
+<A or B Testing for Ads, targets audiences, Radio Advertising>
+<Audience Targeting, connectedTo, A or B Testing for Ads>
+<Audience Targeting, connectedTo, Campaign Planning>
+<Audience Targeting, connectedTo, Direct Response Campaigns>
+<Audience Targeting, connectedTo, Print Advertising>
+<Brand Awareness Campaigns, connectedTo, Radio Advertising>
+<Brand Awareness Campaigns, connectedTo, Retargeting Campaigns>
+<Campaign Planning, connectedTo, A or B Testing for Ads>
+<Campaign Planning, connectedTo, Native Advertising>
+<Campaign Planning, connectedTo, Radio Advertising>
+<Conversion Tracking, connectedTo, Brand Awareness Campaigns>
+<Conversion Tracking, connectedTo, Direct Response Campaigns>
+<Demographic Targeting, connectedTo, Return on Ad Spend Calculation>
+<Display Advertising, connectedTo, Conversion Tracking>
+<Display Advertising, connectedTo, Direct Response Campaigns>
+<Display Advertising, connectedTo, Print Advertising>
+<Display Advertising, manages ad networks, Campaign Planning>
+<Media Buying, connectedTo, Direct Response Campaigns>
+<Native Advertising, connectedTo, Demographic Targeting>
+<Outdoor Advertising, connectedTo, Brand Awareness Campaigns>
+<Print Advertising, connectedTo, Psychographic Targeting>
+<Print Advertising, connectedTo, Return on Ad Spend Calculation>
+<Privacy Concerns in Ads, connectedTo, Direct Response Campaigns>
+<Privacy Concerns in Ads, connectedTo, Media Buying>
+<Programmatic Advertising, connectedTo, Outdoor Advertising>
+<Psychographic Targeting, connectedTo, Regulatory Compliance for Ads>
+<Radio Advertising, connectedTo, Direct Response Campaigns>
+<Radio Advertising, connectedTo, Print Advertising>
+<Radio Advertising, connectedTo, Return on Ad Spend Calculation>
+<Regulatory Compliance for Ads, connectedTo, Programmatic Advertising>
+<Retargeting Campaigns, connectedTo, Audience Targeting>
+<Retargeting Campaigns, connectedTo, Direct Response Campaigns>
+<Return on Ad Spend Calculation, connectedTo, Direct Response Campaigns>
+<Return on Ad Spend Calculation, connectedTo, Privacy Concerns in Ads>
diff --git a/test/diagrams/graph_hard/diagrams_193.dot b/test/diagrams/graph_hard/diagrams_193.dot
new file mode 100644
index 0000000000000000000000000000000000000000..840dfb0fd803f507adf2d05045128a030a3d3cb8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_193.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=BT
+	N0 [label="Distributed Ledger Technology" color="#81C784" fillcolor="#F1F8E9" shape=rect style=filled]
+	N1 [label="Security Token Offerings" color="#C0CA33" fillcolor="#F9FBE7" shape=predefinedprocess style=filled]
+	N2 [label="Mining Operations" color="#673AB7" fillcolor="#D1C4E9" shape=action style=filled]
+	N3 [label="Initial Coin Offerings" color="#673AB7" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N4 [label="Public Blockchain Deployment" color="#C0CA33" fillcolor="#F9FBE7" shape=vnode_shape style=filled]
+	N5 [label="Sidechains and Layer 2 Solutions" color="#81C784" fillcolor="#F1F8E9" shape=preparation style=filled]
+	N6 [label="Voting Systems on Blockchain" color="#C0CA33" fillcolor="#F9FBE7" shape=document style=filled]
+	N7 [label="Interoperability Solutions" color="#673AB7" fillcolor="#D1C4E9" shape=document style=filled]
+	N8 [label="Digital Identity Management" color="#81C784" fillcolor="#F1F8E9" shape=vnode_shape style=filled]
+	S0 [label="" color="#81C784" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#673AB7" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#673AB7" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#C0CA33" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#673AB7" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Energy Trading on Blockchain {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Energy Trading on Blockchain"
+		nest0_0 [label="Governance Models for Blockchains" color="#673AB7" fillcolor="#D1C4E9" shape=action style=filled]
+		nest0_1 [label="Decentralized Network Design" color="#C0CA33" fillcolor="#F9FBE7" shape=rectangle style=filled]
+		nest0_2 [label="Zero_Knowledge Proofs" color="#C0CA33" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+		nest0_3 [label="Oracles Integration" color="#81C784" fillcolor="#F1F8E9" shape=rect style=filled]
+	}
+	subgraph cluster_Financial Asset Tokenization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Financial Asset Tokenization"
+		nest1_0 [label="Real Estate Tokenization" color="#673AB7" fillcolor="#D1C4E9" shape=action style=filled]
+		nest1_1 [label="Consensus Mechanism Development" color="#C0CA33" fillcolor="#F9FBE7" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#81C784" penwidth=1.5 style=solid label="implements sharding" dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest0_0 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N2 [color="#C0CA33" penwidth=1.5 style=dashed label="codes smart contracts" dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid label="operates nodes" dir=forward]
+	N6 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N3 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S0 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#C0CA33" penwidth=1.5 style=dashed label="secures health data" dir=forward]
+	S0 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> S1 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#673AB7" penwidth=1.5 style=dashed label="ensures compliance" dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N4 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N7 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_193.txt b/test/diagrams/graph_hard/diagrams_193.txt
new file mode 100644
index 0000000000000000000000000000000000000000..28c57146b6769a5afec257b57d4752fe0826cf36
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_193.txt
@@ -0,0 +1,29 @@
+<Consensus Mechanism Development, connectedTo, Initial Coin Offerings>
+<Decentralized Network Design, connectedTo, Zero_Knowledge Proofs>
+<Distributed Ledger Technology, connectedTo, Interoperability Solutions>
+<Distributed Ledger Technology, connectedTo, Public Blockchain Deployment>
+<Distributed Ledger Technology, connectedTo, Security Token Offerings>
+<Distributed Ledger Technology, connectedTo, Sidechains and Layer 2 Solutions>
+<Governance Models for Blockchains, connectedTo, Decentralized Network Design>
+<Initial Coin Offerings, connectedTo, Public Blockchain Deployment>
+<Interoperability Solutions, connectedTo, Digital Identity Management>
+<Interoperability Solutions, connectedTo, Governance Models for Blockchains>
+<Mining Operations, connectedTo, Sidechains and Layer 2 Solutions>
+<Mining Operations, ensures compliance, Public Blockchain Deployment>
+<Mining Operations, implements sharding, Initial Coin Offerings>
+<Oracles Integration, codes smart contracts, Mining Operations>
+<Public Blockchain Deployment, connectedTo, Digital Identity Management>
+<Public Blockchain Deployment, connectedTo, Interoperability Solutions>
+<Public Blockchain Deployment, connectedTo, Sidechains and Layer 2 Solutions>
+<Public Blockchain Deployment, connectedTo, Voting Systems on Blockchain>
+<Real Estate Tokenization, operates nodes, Consensus Mechanism Development>
+<Security Token Offerings, connectedTo, Initial Coin Offerings>
+<Security Token Offerings, connectedTo, Mining Operations>
+<Security Token Offerings, connectedTo, Public Blockchain Deployment>
+<Security Token Offerings, connectedTo, Sidechains and Layer 2 Solutions>
+<Security Token Offerings, secures health data, Voting Systems on Blockchain>
+<Sidechains and Layer 2 Solutions, connectedTo, Interoperability Solutions>
+<Sidechains and Layer 2 Solutions, connectedTo, Voting Systems on Blockchain>
+<Voting Systems on Blockchain, connectedTo, Interoperability Solutions>
+<Voting Systems on Blockchain, connectedTo, Real Estate Tokenization>
+<Zero_Knowledge Proofs, connectedTo, Oracles Integration>
diff --git a/test/diagrams/graph_hard/diagrams_194.dot b/test/diagrams/graph_hard/diagrams_194.dot
new file mode 100644
index 0000000000000000000000000000000000000000..24222c71b372eaeb032c1b644800a3163121a0a1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_194.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=RL
+	N0 [label="Tokenomics Design" color="#C2B2F0" fillcolor="#EFE6FF" shape=database style=filled]
+	N1 [label="Transaction Verification" color="#FF5722" fillcolor="#FFCCBC" shape=predefinedprocess style=filled]
+	N2 [label="Identity Verification on Blockchain" color="#C2B2F0" fillcolor="#EFE6FF" shape=hexagon style=filled]
+	N3 [label="Consortium Blockchain Setup" color="#92C79A" fillcolor="#E8F0EA" shape=rect style=filled]
+	N4 [label="Voting Systems on Blockchain" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+	N5 [label="Mining Operations" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N6 [label="Public Blockchain Deployment" color="#92C79A" fillcolor="#E8F0EA" shape=predefinedprocess style=filled]
+	N7 [label="Security Auditing for Blockchains" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N8 [label="Oracles Integration" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N9 [label="Governance Models for Blockchains" color="#C2B2F0" fillcolor="#EFE6FF" shape=predefinedprocess style=filled]
+	N10 [label="Sharding Implementation" color="#92C79A" fillcolor="#E8F0EA" shape=database style=filled]
+	N11 [label="Real Estate Tokenization" color="#C2B2F0" fillcolor="#EFE6FF" shape=multipledocuments style=filled]
+	N12 [label="Scalability Solutions" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+	N13 [label="Smart Contract Development" color="#FF5722" fillcolor="#FFCCBC" shape=inputoutput style=filled]
+	N14 [label="Enterprise Blockchain Solutions" color="#FF5722" fillcolor="#FFCCBC" shape=inputoutput style=filled]
+	S0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#92C79A" fillcolor="#E8F0EA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#92C79A" fillcolor="#E8F0EA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Wallet Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Wallet Management"
+		nest0_0 [label="Digital Identity Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+		nest0_1 [label="Financial Asset Tokenization" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+		nest0_2 [label="Cross_Chain Bridges" color="#92C79A" fillcolor="#E8F0EA" shape=database style=filled]
+	}
+	subgraph cluster_Decentralized Finance Protocols {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Decentralized Finance Protocols"
+		nest1_0 [label="Gaming on Blockchain" color="#92C79A" fillcolor="#E8F0EA" shape=parallelogram style=filled]
+		nest1_1 [label="Sidechains and Layer 2 Solutions" color="#C2B2F0" fillcolor="#EFE6FF" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#92C79A" penwidth=1.5 style=dashed label="facilitates finance" dir=forward]
+	N5 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N12 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S0 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N3 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N2 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S1 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S2 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#000000" penwidth=1.5 style=solid label="generates hashes" dir=forward]
+	S2 -> N9 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N8 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M1 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N12 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_194.txt b/test/diagrams/graph_hard/diagrams_194.txt
new file mode 100644
index 0000000000000000000000000000000000000000..799bebe752746216a6df50c144f83b93beeece6a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_194.txt
@@ -0,0 +1,33 @@
+<Consortium Blockchain Setup, connectedTo, Voting Systems on Blockchain>
+<Cross_Chain Bridges, connectedTo, Transaction Verification>
+<Digital Identity Management, connectedTo, Financial Asset Tokenization>
+<Financial Asset Tokenization, connectedTo, Cross_Chain Bridges>
+<Gaming on Blockchain, facilitates finance, Sidechains and Layer 2 Solutions>
+<Governance Models for Blockchains, connectedTo, Scalability Solutions>
+<Governance Models for Blockchains, connectedTo, Sharding Implementation>
+<Identity Verification on Blockchain, connectedTo, Consortium Blockchain Setup>
+<Identity Verification on Blockchain, connectedTo, Oracles Integration>
+<Mining Operations, connectedTo, Gaming on Blockchain>
+<Mining Operations, connectedTo, Oracles Integration>
+<Mining Operations, connectedTo, Public Blockchain Deployment>
+<Mining Operations, connectedTo, Scalability Solutions>
+<Oracles Integration, connectedTo, Governance Models for Blockchains>
+<Public Blockchain Deployment, connectedTo, Governance Models for Blockchains>
+<Public Blockchain Deployment, connectedTo, Security Auditing for Blockchains>
+<Public Blockchain Deployment, generates hashes, Scalability Solutions>
+<Real Estate Tokenization, connectedTo, Scalability Solutions>
+<Scalability Solutions, connectedTo, Digital Identity Management>
+<Scalability Solutions, connectedTo, Smart Contract Development>
+<Security Auditing for Blockchains, connectedTo, Oracles Integration>
+<Security Auditing for Blockchains, connectedTo, Sharding Implementation>
+<Security Auditing for Blockchains, connectedTo, Smart Contract Development>
+<Sharding Implementation, connectedTo, Real Estate Tokenization>
+<Sidechains and Layer 2 Solutions, connectedTo, Scalability Solutions>
+<Smart Contract Development, connectedTo, Enterprise Blockchain Solutions>
+<Tokenomics Design, connectedTo, Consortium Blockchain Setup>
+<Tokenomics Design, connectedTo, Identity Verification on Blockchain>
+<Tokenomics Design, connectedTo, Security Auditing for Blockchains>
+<Tokenomics Design, connectedTo, Transaction Verification>
+<Transaction Verification, connectedTo, Identity Verification on Blockchain>
+<Transaction Verification, connectedTo, Oracles Integration>
+<Voting Systems on Blockchain, connectedTo, Mining Operations>
diff --git a/test/diagrams/graph_hard/diagrams_195.dot b/test/diagrams/graph_hard/diagrams_195.dot
new file mode 100644
index 0000000000000000000000000000000000000000..45599736a67c8c976500eb743d98ed5e067a54e2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_195.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=RL
+	N0 [label="Distributed Ledger Technology" color="#92C79A" fillcolor="#E8F0EA" shape=inputoutput style=filled]
+	N1 [label="Oracles Integration" color="#FFF8A6" fillcolor="#FFFDE0" shape=predefinedprocess style=filled]
+	N2 [label="Identity Verification on Blockchain" color="#FFF8A6" fillcolor="#FFFDE0" shape=diamond style=filled]
+	N3 [label="Governance Models for Blockchains" color="#BDBDBD" fillcolor="#F5F5F5" shape=rect style=filled]
+	N4 [label="Supply Chain Traceability" color="#FFF8A6" fillcolor="#FFFDE0" shape=diamond style=filled]
+	N5 [label="Tokenomics Design" color="#BDBDBD" fillcolor="#F5F5F5" shape=multipledocuments style=filled]
+	N6 [label="Energy Trading on Blockchain" color="#FFF8A6" fillcolor="#FFFDE0" shape=database style=filled]
+	N7 [label="Zero_Knowledge Proofs" color="#92C79A" fillcolor="#E8F0EA" shape=inputoutput style=filled]
+	N8 [label="Mining Operations" color="#BDBDBD" fillcolor="#F5F5F5" shape=rect style=filled]
+	N9 [label="Cross_Chain Bridges" color="#BDBDBD" fillcolor="#F5F5F5" shape=document style=filled]
+	N10 [label="Gaming on Blockchain" color="#BDBDBD" fillcolor="#F5F5F5" shape=rectangle style=filled]
+	N11 [label="Consortium Blockchain Setup" color="#92C79A" fillcolor="#E8F0EA" shape=vnode_shape style=filled]
+	N12 [label="Financial Asset Tokenization" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N13 [label="Wallet Management" color="#92C79A" fillcolor="#E8F0EA" shape=vnode_shape style=filled]
+	S1 [label="" color="#92C79A" fillcolor="#E8F0EA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#BDBDBD" fillcolor="#F5F5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Real Estate Tokenization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Real Estate Tokenization"
+		nest0_0 [label="Healthcare Data Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=document style=filled]
+		nest0_1 [label="Sidechains and Layer 2 Solutions" color="#BDBDBD" fillcolor="#F5F5F5" shape=rectangle style=filled]
+	}
+	subgraph cluster_Private Blockchain Implementation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Private Blockchain Implementation"
+		nest1_0 [label="Digital Identity Management" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest1_1 [label="Decentralized Network Design" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+		nest1_2 [label="Voting Systems on Blockchain" color="#92C79A" fillcolor="#E8F0EA" shape=multipledocuments style=filled]
+		nest1_3 [label="Regulatory Compliance for Blockchain" color="#FFF8A6" fillcolor="#FFFDE0" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#FFF8A6" penwidth=1.5 style=dashed label="powers games" dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFF8A6" penwidth=1.5 style=dashed label="codes smart contracts" dir=forward]
+	N3 -> N4 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N11 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N13 [color="#BDBDBD" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#92C79A" penwidth=1.5 style=dashed label="facilitates finance" dir=forward]
+	nest1_3 -> N7 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N8 -> S1 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#BDBDBD" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	N0 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N6 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_195.txt b/test/diagrams/graph_hard/diagrams_195.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5adcdaf2f80e40a52fd99883ff0ac181305a0441
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_195.txt
@@ -0,0 +1,28 @@
+<Consortium Blockchain Setup, connectedTo, Financial Asset Tokenization>
+<Consortium Blockchain Setup, connectedTo, Healthcare Data Management>
+<Cross_Chain Bridges, connectedTo, Gaming on Blockchain>
+<Decentralized Network Design, connectedTo, Voting Systems on Blockchain>
+<Digital Identity Management, connectedTo, Decentralized Network Design>
+<Distributed Ledger Technology, connectedTo, Consortium Blockchain Setup>
+<Distributed Ledger Technology, powers games, Oracles Integration>
+<Energy Trading on Blockchain, connectedTo, Zero_Knowledge Proofs>
+<Financial Asset Tokenization, connectedTo, Wallet Management>
+<Gaming on Blockchain, connectedTo, Consortium Blockchain Setup>
+<Gaming on Blockchain, connectedTo, Energy Trading on Blockchain>
+<Governance Models for Blockchains, connectedTo, Supply Chain Traceability>
+<Healthcare Data Management, connectedTo, Sidechains and Layer 2 Solutions>
+<Identity Verification on Blockchain, codes smart contracts, Governance Models for Blockchains>
+<Mining Operations, connectedTo, Cross_Chain Bridges>
+<Mining Operations, connectedTo, Financial Asset Tokenization>
+<Mining Operations, connectedTo, Gaming on Blockchain>
+<Mining Operations, connectedTo, Wallet Management>
+<Oracles Integration, connectedTo, Identity Verification on Blockchain>
+<Oracles Integration, connectedTo, Zero_Knowledge Proofs>
+<Oracles Integration, facilitates finance, Digital Identity Management>
+<Regulatory Compliance for Blockchain, connectedTo, Zero_Knowledge Proofs>
+<Sidechains and Layer 2 Solutions, connectedTo, Wallet Management>
+<Supply Chain Traceability, connectedTo, Tokenomics Design>
+<Tokenomics Design, connectedTo, Energy Trading on Blockchain>
+<Tokenomics Design, connectedTo, Zero_Knowledge Proofs>
+<Voting Systems on Blockchain, connectedTo, Regulatory Compliance for Blockchain>
+<Zero_Knowledge Proofs, connectedTo, Mining Operations>
diff --git a/test/diagrams/graph_hard/diagrams_196.txt b/test/diagrams/graph_hard/diagrams_196.txt
new file mode 100644
index 0000000000000000000000000000000000000000..04d17a7b8a4fe8b4ff9aedc4e4a51aad1b456d70
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_196.txt
@@ -0,0 +1,31 @@
+<Airdrop Campaigns, connectedTo, Initial Exchange Offering>
+<Blockchain Explorers, connectedTo, Airdrop Campaigns>
+<Coin Creation, connectedTo, Legal Advisory for Crypto>
+<Community Building, connectedTo, Venture Capital Funding>
+<Cross_chain Swaps, connectedTo, Fraud Prevention>
+<Cryptocurrency Education, connectedTo, NFT Marketplace Development>
+<Decentralized Autonomous Organizations, connectedTo, Community Building>
+<Fraud Prevention, connectedTo, Community Building>
+<Fraud Prevention, connectedTo, Regulatory Compliance>
+<Hot Wallet Security, connectedTo, Airdrop Campaigns>
+<Initial Exchange Offering, connectedTo, Key Management>
+<KYC or AML Procedures, connectedTo, Liquidity Provision>
+<Key Management, connectedTo, Web3 Integration>
+<Legal Advisory for Crypto, connectedTo, Blockchain Explorers>
+<Liquidity Provision, connectedTo, Security Audits>
+<Mining Algorithm Design, connectedTo, Coin Creation>
+<Mining Algorithm Design, connectedTo, Cryptocurrency Education>
+<Mining Algorithm Design, connectedTo, KYC or AML Procedures>
+<NFT Marketplace Development, connectedTo, Airdrop Campaigns>
+<NFT Marketplace Development, connectedTo, Tax Reporting for Crypto>
+<Regulatory Compliance, connectedTo, Airdrop Campaigns>
+<Regulatory Compliance, connectedTo, Community Building>
+<Regulatory Compliance, connectedTo, Mining Algorithm Design>
+<Security Audits, connectedTo, Tax Reporting for Crypto>
+<Smart Contract Auditing, connectedTo, Community Building>
+<Smart Contract Auditing, connectedTo, Cross_chain Swaps>
+<Smart Contract Auditing, connectedTo, Hot Wallet Security>
+<Smart Contract Auditing, connectedTo, Key Management>
+<Tax Reporting for Crypto, connectedTo, Decentralized Autonomous Organizations>
+<Token Generation Event, borrows capital, Smart Contract Auditing>
+<Venture Capital Funding, connectedTo, Hot Wallet Security>
diff --git a/test/diagrams/graph_hard/diagrams_197.dot b/test/diagrams/graph_hard/diagrams_197.dot
new file mode 100644
index 0000000000000000000000000000000000000000..aace47115d5fd3c651f8c965ed1713ccbd0cdc72
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_197.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=TB
+	N0 [label="Staking" color="#AED581" fillcolor="#F0F4C3" shape=multipledocuments style=filled]
+	N1 [label="Fiat On or Off Ramps" color="#CFCFCF" fillcolor="#F6F6F6" shape=diamond style=filled]
+	N2 [label="Cryptocurrency Education" color="#CFCFCF" fillcolor="#F6F6F6" shape=action style=filled]
+	N3 [label="Liquidity Provision" color="#FFC085" fillcolor="#FFDAB9" shape=predefinedprocess style=filled]
+	N4 [label="Interoperability Solutions" color="#AED581" fillcolor="#F0F4C3" shape=rect style=filled]
+	N5 [label="GameFi Development" color="#AED581" fillcolor="#F0F4C3" shape=action style=filled]
+	N6 [label="Key Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=inputoutput style=filled]
+	N7 [label="Portfolio Management" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N8 [label="Cryptocurrency Trading Bots" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N9 [label="Airdrop Campaigns" color="#AED581" fillcolor="#F0F4C3" shape=inputoutput style=filled]
+	N10 [label="Hot Wallet Security" color="#FFC085" fillcolor="#FFDAB9" shape=vnode_shape style=filled]
+	N11 [label="Exchange Listing" color="#CFCFCF" fillcolor="#F6F6F6" shape=vnode_shape style=filled]
+	N12 [label="Blockchain Integration" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+	N13 [label="Wallet Development" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	S0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Lending and Borrowing Protocols {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Lending and Borrowing Protocols"
+		nest0_0 [label="NFT Marketplace Development" color="#FFC085" fillcolor="#FFDAB9" shape=parallelogram style=filled]
+		nest0_1 [label="Initial Exchange Offering" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+		nest0_2 [label="Decentralized Autonomous Organizations" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	}
+	subgraph cluster_KYC or AML Procedures {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="KYC or AML Procedures"
+		nest1_0 [label="Venture Capital Funding" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+		nest1_1 [label="Regulatory Compliance" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+		nest1_2 [label="Transaction Processing" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+		nest1_3 [label="Cross_chain Swaps" color="#FFC085" fillcolor="#FFDAB9" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed label="generates yield" dir=forward]
+	N6 -> N7 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#CFCFCF" penwidth=1.5 style=dashed label="lends funds" dir=forward]
+	N12 -> nest0_0 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N10 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest1_0 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N4 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N10 -> S0 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S1 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	M0 -> N13 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N7 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N4 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_197.txt b/test/diagrams/graph_hard/diagrams_197.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a1dff2c28c4954ccbdf4c63d565a43aedb5c786e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_197.txt
@@ -0,0 +1,35 @@
+<Airdrop Campaigns, connectedTo, Hot Wallet Security>
+<Blockchain Integration, connectedTo, NFT Marketplace Development>
+<Blockchain Integration, connectedTo, Wallet Development>
+<Cross_chain Swaps, connectedTo, Interoperability Solutions>
+<Cryptocurrency Education, connectedTo, Interoperability Solutions>
+<Cryptocurrency Education, connectedTo, Liquidity Provision>
+<Cryptocurrency Education, connectedTo, Portfolio Management>
+<Cryptocurrency Trading Bots, connectedTo, Airdrop Campaigns>
+<Decentralized Autonomous Organizations, connectedTo, Hot Wallet Security>
+<Exchange Listing, connectedTo, Blockchain Integration>
+<Fiat On or Off Ramps, connectedTo, Cryptocurrency Education>
+<Fiat On or Off Ramps, connectedTo, Interoperability Solutions>
+<GameFi Development, generates yield, Key Management>
+<Hot Wallet Security, connectedTo, Blockchain Integration>
+<Hot Wallet Security, connectedTo, Exchange Listing>
+<Hot Wallet Security, connectedTo, Wallet Development>
+<Initial Exchange Offering, lends funds, Decentralized Autonomous Organizations>
+<Interoperability Solutions, connectedTo, GameFi Development>
+<Key Management, connectedTo, Portfolio Management>
+<Key Management, connectedTo, Wallet Development>
+<Liquidity Provision, connectedTo, Interoperability Solutions>
+<Liquidity Provision, connectedTo, Portfolio Management>
+<Liquidity Provision, connectedTo, Venture Capital Funding>
+<NFT Marketplace Development, connectedTo, Initial Exchange Offering>
+<Portfolio Management, connectedTo, Airdrop Campaigns>
+<Portfolio Management, connectedTo, Cryptocurrency Trading Bots>
+<Portfolio Management, connectedTo, Exchange Listing>
+<Portfolio Management, connectedTo, Wallet Development>
+<Regulatory Compliance, connectedTo, Transaction Processing>
+<Staking, connectedTo, Fiat On or Off Ramps>
+<Staking, connectedTo, Interoperability Solutions>
+<Staking, connectedTo, Portfolio Management>
+<Staking, connectedTo, Wallet Development>
+<Transaction Processing, connectedTo, Cross_chain Swaps>
+<Venture Capital Funding, connectedTo, Regulatory Compliance>
diff --git a/test/diagrams/graph_hard/diagrams_198.dot b/test/diagrams/graph_hard/diagrams_198.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c27401a3749b3256becf3123c9f44fafb4494647
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_198.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=BT
+	N0 [label="Security Audits" color="#FFCC7A" fillcolor="#FFF6D9" shape=rect style=filled]
+	N1 [label="Exchange Listing" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N2 [label="NFT Marketplace Development" color="#6EB76D" fillcolor="#E9F7E8" shape=diamond style=filled]
+	N3 [label="Coin Creation" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N4 [label="Blockchain Explorers" color="#FFCC7A" fillcolor="#FFF6D9" shape=preparation style=filled]
+	N5 [label="Regulatory Compliance" color="#FFCC7A" fillcolor="#FFF6D9" shape=action style=filled]
+	N6 [label="Decentralized Autonomous Organizations" color="#6EB76D" fillcolor="#E9F7E8" shape=diamond style=filled]
+	N7 [label="Fraud Prevention" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+	N8 [label="Wallet Development" color="#BDAFA8" fillcolor="#E4E0DF" shape=diamond style=filled]
+	N9 [label="Custodial Services" color="#FFCC7A" fillcolor="#FFF6D9" shape=action style=filled]
+	N10 [label="Token Generation Event" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+	N11 [label="Hot Wallet Security" color="#6EB76D" fillcolor="#E9F7E8" shape=preparation style=filled]
+	N12 [label="GameFi Development" color="#BDAFA8" fillcolor="#E4E0DF" shape=document style=filled]
+	S0 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFCC7A" fillcolor="#FFF6D9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Staking {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Staking"
+		nest0_0 [label="Yield Farming" color="#FFCC7A" fillcolor="#FFF6D9" shape=preparation style=filled]
+		nest0_1 [label="Initial Exchange Offering" color="#FFCC7A" fillcolor="#FFF6D9" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Legal Advisory for Crypto {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Legal Advisory for Crypto"
+		nest1_0 [label="Web3 Integration" color="#FFCC7A" fillcolor="#FFF6D9" shape=document style=filled]
+		nest1_1 [label="KYC or AML Procedures" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+		nest1_2 [label="Decentralized Exchange Operation" color="#BDAFA8" fillcolor="#E4E0DF" shape=rectangle style=filled]
+		nest1_3 [label="Blockchain Integration" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#6EB76D" penwidth=1.5 style=dashed label="secures funds" dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest0_0 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N11 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N1 [color="#BDAFA8" penwidth=1.5 style=dashed label="enables swaps" dir=forward]
+	N9 -> S0 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S2 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N9 -> M1 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N12 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_198.txt b/test/diagrams/graph_hard/diagrams_198.txt
new file mode 100644
index 0000000000000000000000000000000000000000..662282f28d64834fce780acda1528d284afd9a67
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_198.txt
@@ -0,0 +1,32 @@
+<Blockchain Explorers, secures funds, Regulatory Compliance>
+<Blockchain Integration, enables swaps, Exchange Listing>
+<Coin Creation, connectedTo, Blockchain Explorers>
+<Custodial Services, connectedTo, GameFi Development>
+<Custodial Services, connectedTo, Hot Wallet Security>
+<Custodial Services, connectedTo, Token Generation Event>
+<Decentralized Autonomous Organizations, connectedTo, Fraud Prevention>
+<Decentralized Exchange Operation, connectedTo, Blockchain Integration>
+<Exchange Listing, connectedTo, NFT Marketplace Development>
+<Fraud Prevention, connectedTo, Wallet Development>
+<Hot Wallet Security, connectedTo, GameFi Development>
+<Initial Exchange Offering, connectedTo, Hot Wallet Security>
+<Initial Exchange Offering, partOf, Initial Exchange Offering>
+<KYC or AML Procedures, connectedTo, Decentralized Exchange Operation>
+<NFT Marketplace Development, connectedTo, Blockchain Explorers>
+<NFT Marketplace Development, connectedTo, Coin Creation>
+<NFT Marketplace Development, connectedTo, Custodial Services>
+<NFT Marketplace Development, connectedTo, Decentralized Autonomous Organizations>
+<NFT Marketplace Development, connectedTo, Fraud Prevention>
+<NFT Marketplace Development, connectedTo, GameFi Development>
+<NFT Marketplace Development, connectedTo, Wallet Development>
+<NFT Marketplace Development, connectedTo, Web3 Integration>
+<Regulatory Compliance, connectedTo, Decentralized Autonomous Organizations>
+<Regulatory Compliance, connectedTo, GameFi Development>
+<Security Audits, connectedTo, Exchange Listing>
+<Security Audits, connectedTo, GameFi Development>
+<Token Generation Event, connectedTo, Hot Wallet Security>
+<Token Generation Event, connectedTo, Yield Farming>
+<Wallet Development, connectedTo, Custodial Services>
+<Web3 Integration, connectedTo, KYC or AML Procedures>
+<Yield Farming, connectedTo, Initial Exchange Offering>
+<Yield Farming, partOf, Yield Farming>
diff --git a/test/diagrams/graph_hard/diagrams_199.dot b/test/diagrams/graph_hard/diagrams_199.dot
new file mode 100644
index 0000000000000000000000000000000000000000..63f678bfd0976d082159352d5fb9ba05b29f044a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_199.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=RL
+	N0 [label="Investor Verification" color="#E57373" fillcolor="#FFEBEE" shape=rect style=filled]
+	N1 [label="Intellectual Property Protection" color="#E57373" fillcolor="#FFEBEE" shape=inputoutput style=filled]
+	N2 [label="Manufacturing Planning" color="#E57373" fillcolor="#FFEBEE" shape=parallelogram style=filled]
+	N3 [label="Social Media Promotion" color="#8C9EFF" fillcolor="#D3D7EB" shape=rect style=filled]
+	N4 [label="Marketing Strategy" color="#3F51B5" fillcolor="#C5CAE9" shape=rect style=filled]
+	N5 [label="Legal Compliance" color="#E57373" fillcolor="#FFEBEE" shape=preparation style=filled]
+	N6 [label="Investor Relations" color="#E57373" fillcolor="#FFEBEE" shape=rect style=filled]
+	N7 [label="Reward_Based Crowdfunding" color="#E57373" fillcolor="#FFEBEE" shape=database style=filled]
+	N8 [label="Product Development Lifecycle" color="#3F51B5" fillcolor="#C5CAE9" shape=inputoutput style=filled]
+	N9 [label="Backer Communication" color="#E57373" fillcolor="#FFEBEE" shape=predefinedprocess style=filled]
+	N10 [label="Shareholder Management" color="#E57373" fillcolor="#FFEBEE" shape=vnode_shape style=filled]
+	N11 [label="Platform Selection" color="#E57373" fillcolor="#FFEBEE" shape=parallelogram style=filled]
+	N12 [label="Community Building" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+	N13 [label="Post_Campaign Updates" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	S0 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Tax Implications of Crowdfunding {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Tax Implications of Crowdfunding"
+		nest0_0 [label="Fulfillment Planning" color="#8C9EFF" fillcolor="#D3D7EB" shape=diamond style=filled]
+		nest0_1 [label="Press Outreach" color="#3F51B5" fillcolor="#C5CAE9" shape=action style=filled]
+		nest0_2 [label="Success Fee Structures" color="#E57373" fillcolor="#FFEBEE" shape=rectangle style=filled]
+		nest0_3 [label="Debt Crowdfunding" color="#8C9EFF" fillcolor="#D3D7EB" shape=document style=filled]
+	}
+	subgraph cluster_International Crowdfunding {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="International Crowdfunding"
+		nest1_0 [label="Logistics for Rewards" color="#3F51B5" fillcolor="#C5CAE9" shape=multipledocuments style=filled]
+		nest1_1 [label="Escrow Management" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest1_2 [label="Donation_Based Crowdfunding" color="#E57373" fillcolor="#FFEBEE" shape=predefinedprocess style=filled]
+		nest1_3 [label="Campaign Creation" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	}
+	N0 -> N1 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N4 [color="#E57373" penwidth=1.5 style=dashed label="creates campaigns" dir=forward]
+	nest1_0 -> nest1_1 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N8 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N13 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N11 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_199.txt b/test/diagrams/graph_hard/diagrams_199.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b3f692487e05b3225ed65b5b27b9688c6ce4cda1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_199.txt
@@ -0,0 +1,34 @@
+<Backer Communication, connectedTo, Shareholder Management>
+<Campaign Creation, connectedTo, Product Development Lifecycle>
+<Community Building, connectedTo, Post_Campaign Updates>
+<Debt Crowdfunding, creates campaigns, Marketing Strategy>
+<Donation_Based Crowdfunding, connectedTo, Campaign Creation>
+<Escrow Management, connectedTo, Donation_Based Crowdfunding>
+<Fulfillment Planning, connectedTo, Press Outreach>
+<Intellectual Property Protection, connectedTo, Manufacturing Planning>
+<Intellectual Property Protection, connectedTo, Platform Selection>
+<Investor Relations, connectedTo, Reward_Based Crowdfunding>
+<Investor Verification, connectedTo, Intellectual Property Protection>
+<Investor Verification, connectedTo, Platform Selection>
+<Investor Verification, connectedTo, Post_Campaign Updates>
+<Legal Compliance, connectedTo, Backer Communication>
+<Legal Compliance, connectedTo, Investor Relations>
+<Legal Compliance, connectedTo, Post_Campaign Updates>
+<Legal Compliance, connectedTo, Reward_Based Crowdfunding>
+<Logistics for Rewards, connectedTo, Escrow Management>
+<Manufacturing Planning, connectedTo, Backer Communication>
+<Manufacturing Planning, connectedTo, Marketing Strategy>
+<Manufacturing Planning, connectedTo, Product Development Lifecycle>
+<Manufacturing Planning, connectedTo, Social Media Promotion>
+<Marketing Strategy, connectedTo, Legal Compliance>
+<Marketing Strategy, connectedTo, Platform Selection>
+<Marketing Strategy, connectedTo, Post_Campaign Updates>
+<Platform Selection, connectedTo, Community Building>
+<Press Outreach, connectedTo, Success Fee Structures>
+<Product Development Lifecycle, connectedTo, Backer Communication>
+<Product Development Lifecycle, connectedTo, Logistics for Rewards>
+<Reward_Based Crowdfunding, connectedTo, Fulfillment Planning>
+<Reward_Based Crowdfunding, connectedTo, Product Development Lifecycle>
+<Shareholder Management, connectedTo, Platform Selection>
+<Social Media Promotion, connectedTo, Marketing Strategy>
+<Success Fee Structures, connectedTo, Debt Crowdfunding>
diff --git a/test/diagrams/graph_hard/diagrams_2.dot b/test/diagrams/graph_hard/diagrams_2.dot
new file mode 100644
index 0000000000000000000000000000000000000000..411b611c68a8a7a6dc57925364e06b4db54c37db
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_2.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=TB
+	N0 [label="Underwriting" color="#FFB74D" fillcolor="#FFF3E0" shape=action style=filled]
+	N1 [label="Market Analysis" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+	N2 [label="IPO Launch" color="#FFE470" fillcolor="#FFFAE0" shape=action style=filled]
+	N3 [label="Debt Collection" color="#64B5F6" fillcolor="#E3F2FD" shape=action style=filled]
+	N4 [label="Compliance Review" color="#FFE470" fillcolor="#FFFAE0" shape=vnode_shape style=filled]
+	N5 [label="Asset Management" color="#FFB74D" fillcolor="#FFF3E0" shape=parallelogram style=filled]
+	N6 [label="Portfolio Management" color="#FFB74D" fillcolor="#FFF3E0" shape=multipledocuments style=filled]
+	N7 [label="Mortgage Application" color="#FFE470" fillcolor="#FFFAE0" shape=action style=filled]
+	N8 [label="Financial Reporting" color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N9 [label="Fund Disbursement" color="#FFB74D" fillcolor="#FFF3E0" shape=preparation style=filled]
+	N10 [label="AML Screening" color="#FFB74D" fillcolor="#FFF3E0" shape=preparation style=filled]
+	N11 [label="Venture Capital Funding" color="#64B5F6" fillcolor="#E3F2FD" shape=predefinedprocess style=filled]
+	S0 [label="" color="#FFE470" fillcolor="#FFFAE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFE470" fillcolor="#FFFAE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFB74D" fillcolor="#FFF3E0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Credit Scoring {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Credit Scoring"
+		nest0_0 [label="Collateral Evaluation" color="#FFE470" fillcolor="#FFFAE0" shape=predefinedprocess style=filled]
+		nest0_1 [label="Treasury Management" color="#64B5F6" fillcolor="#E3F2FD" shape=action style=filled]
+		nest0_2 [label="Budgeting Analysis" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	}
+	subgraph cluster_Account Verification {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Account Verification"
+		nest1_0 [label="Interest Calculation" color="#FFE470" fillcolor="#FFFAE0" shape=action style=filled]
+		nest1_1 [label="Blockchain Verification" color="#FFE470" fillcolor="#FFFAE0" shape=multipledocuments style=filled]
+		nest1_2 [label="Financial Advisory" color="#64B5F6" fillcolor="#E3F2FD" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed label="loans" dir=forward]
+	N1 -> N2 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFE470" penwidth=1.5 style=dashed label="checks" dir=forward]
+	N6 -> N7 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFE470" penwidth=1.5 style=solid label="verifies" dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest0_0 [color="#FFE470" penwidth=1.5 style=solid label="models" dir=forward]
+	nest0_2 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#FFE470" penwidth=1.5 style=dashed label="secures" dir=forward]
+	N10 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N7 -> S1 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	M0 -> N5 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#FFE470" penwidth=1.5 style=dashed label="consults" dir=forward]
+	N0 -> M1 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N6 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#64B5F6" penwidth=1.5 style=dashed label="evaluates" dir=forward]
+	M2 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_2.txt b/test/diagrams/graph_hard/diagrams_2.txt
new file mode 100644
index 0000000000000000000000000000000000000000..425486f5910378acdf8ee73ae4103303e79b5d89
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_2.txt
@@ -0,0 +1,31 @@
+<AML Screening, connectedTo, Interest Calculation>
+<AML Screening, connectedTo, Venture Capital Funding>
+<Asset Management, checks, Portfolio Management>
+<Blockchain Verification, secures, Financial Advisory>
+<Budgeting Analysis, connectedTo, Asset Management>
+<Collateral Evaluation, connectedTo, Treasury Management>
+<Compliance Review, connectedTo, Asset Management>
+<Compliance Review, models, Collateral Evaluation>
+<Debt Collection, connectedTo, Compliance Review>
+<Debt Collection, connectedTo, Mortgage Application>
+<Debt Collection, connectedTo, Portfolio Management>
+<Financial Advisory, connectedTo, Fund Disbursement>
+<Financial Reporting, connectedTo, Fund Disbursement>
+<Fund Disbursement, verifies, AML Screening>
+<IPO Launch, connectedTo, Debt Collection>
+<IPO Launch, consults, Portfolio Management>
+<IPO Launch, evaluates, Mortgage Application>
+<Interest Calculation, connectedTo, Blockchain Verification>
+<Market Analysis, connectedTo, Asset Management>
+<Market Analysis, connectedTo, Financial Reporting>
+<Market Analysis, connectedTo, Fund Disbursement>
+<Market Analysis, connectedTo, IPO Launch>
+<Mortgage Application, connectedTo, AML Screening>
+<Mortgage Application, connectedTo, Financial Reporting>
+<Mortgage Application, connectedTo, Fund Disbursement>
+<Mortgage Application, connectedTo, Venture Capital Funding>
+<Portfolio Management, connectedTo, Mortgage Application>
+<Treasury Management, connectedTo, Budgeting Analysis>
+<Underwriting, connectedTo, Asset Management>
+<Underwriting, connectedTo, Portfolio Management>
+<Underwriting, loans, Market Analysis>
diff --git a/test/diagrams/graph_hard/diagrams_20.dot b/test/diagrams/graph_hard/diagrams_20.dot
new file mode 100644
index 0000000000000000000000000000000000000000..651bf442cc3a17d1e6f5b1e4dab513d054efe464
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_20.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=TB
+	N0 [label="Power Purchase" color="#8C9EFF" fillcolor="#D3D7EB" shape=database style=filled]
+	N1 [label="Energy Efficiency Audit" color="#4FC3F7" fillcolor="#E1F5FE" shape=document style=filled]
+	N2 [label="Power Backup" color="#8C9EFF" fillcolor="#D3D7EB" shape=parallelogram style=filled]
+	N3 [label="Grid Modernization" color="#8C9EFF" fillcolor="#D3D7EB" shape=preparation style=filled]
+	N4 [label="Generator Check" color="#FFB74D" fillcolor="#FFF3E0" shape=multipledocuments style=filled]
+	N5 [label="Nuclear Reactor Control" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N6 [label="Energy Infrastructure Planning" color="#FFB74D" fillcolor="#FFF3E0" shape=rect style=filled]
+	N7 [label="Outage Detection" color="#8C9EFF" fillcolor="#D3D7EB" shape=document style=filled]
+	N8 [label="Solar Panel Installation" color="#4FC3F7" fillcolor="#E1F5FE" shape=rectangle style=filled]
+	N9 [label="Battery Monitoring" color="#FFB74D" fillcolor="#FFF3E0" shape=predefinedprocess style=filled]
+	N10 [label="Regulatory Compliance" color="#4FC3F7" fillcolor="#E1F5FE" shape=preparation style=filled]
+	N11 [label="Carbon Capture" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N12 [label="Geothermal Power" color="#4FC3F7" fillcolor="#E1F5FE" shape=multipledocuments style=filled]
+	N13 [label="Grid Balancing" color="#4FC3F7" fillcolor="#E1F5FE" shape=action style=filled]
+	N14 [label="Alert Dispatch" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S0 [label="" color="#FFB74D" fillcolor="#FFF3E0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#4FC3F7" fillcolor="#E1F5FE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#4FC3F7" fillcolor="#E1F5FE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#4FC3F7" fillcolor="#E1F5FE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#8C9EFF" fillcolor="#D3D7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Pipeline Monitoring {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Pipeline Monitoring"
+		nest0_0 [label="Substation Automation" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+		nest0_1 [label="Consumption Logging" color="#4FC3F7" fillcolor="#E1F5FE" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Renewable Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Renewable Integration"
+		nest1_0 [label="Peak Shaving" color="#4FC3F7" fillcolor="#E1F5FE" shape=hexagon style=filled]
+		nest1_1 [label="Wind Turbine Monitoring" color="#FFB74D" fillcolor="#FFF3E0" shape=rect style=filled]
+		nest1_2 [label="Hydropower Generation" color="#8C9EFF" fillcolor="#D3D7EB" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#4FC3F7" penwidth=1.5 style=solid label="consumes" dir=forward]
+	N4 -> N5 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N11 -> nest0_0 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest1_0 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N10 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N0 -> S0 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> S1 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#FFB74D" penwidth=1.5 style=solid label="permits" dir=forward]
+	N4 -> S2 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N14 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N13 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N8 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#FFB74D" penwidth=1.5 style=solid label="trades" dir=forward]
+	N1 -> M0 [color="#4FC3F7" penwidth=1.5 style=solid label="stores" dir=forward]
+	N5 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N8 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#8C9EFF" penwidth=1.5 style=solid label="generates" dir=forward]
+	N6 -> M1 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	M1 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#FFB74D" penwidth=1.5 style=dashed label="innovates" dir=forward]
+	N2 -> M2 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	M2 -> N8 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_20.txt b/test/diagrams/graph_hard/diagrams_20.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3da99531d33a6e0113abc12ebe54a5cfce92ed4b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_20.txt
@@ -0,0 +1,37 @@
+<Battery Monitoring, connectedTo, Regulatory Compliance>
+<Carbon Capture, connectedTo, Geothermal Power>
+<Carbon Capture, connectedTo, Substation Automation>
+<Consumption Logging, connectedTo, Outage Detection>
+<Energy Efficiency Audit, connectedTo, Power Backup>
+<Energy Efficiency Audit, innovates, Solar Panel Installation>
+<Energy Efficiency Audit, stores, Solar Panel Installation>
+<Energy Infrastructure Planning, connectedTo, Outage Detection>
+<Energy Infrastructure Planning, connectedTo, Peak Shaving>
+<Energy Infrastructure Planning, connectedTo, Solar Panel Installation>
+<Generator Check, connectedTo, Alert Dispatch>
+<Generator Check, connectedTo, Grid Balancing>
+<Generator Check, connectedTo, Nuclear Reactor Control>
+<Generator Check, connectedTo, Outage Detection>
+<Generator Check, connectedTo, Solar Panel Installation>
+<Generator Check, permits, Alert Dispatch>
+<Geothermal Power, connectedTo, Grid Balancing>
+<Grid Balancing, connectedTo, Alert Dispatch>
+<Grid Modernization, connectedTo, Solar Panel Installation>
+<Grid Modernization, consumes, Generator Check>
+<Hydropower Generation, connectedTo, Regulatory Compliance>
+<Nuclear Reactor Control, connectedTo, Energy Infrastructure Planning>
+<Nuclear Reactor Control, connectedTo, Solar Panel Installation>
+<Outage Detection, connectedTo, Solar Panel Installation>
+<Peak Shaving, connectedTo, Wind Turbine Monitoring>
+<Power Backup, connectedTo, Grid Modernization>
+<Power Backup, connectedTo, Solar Panel Installation>
+<Power Backup, generates, Solar Panel Installation>
+<Power Backup, trades, Solar Panel Installation>
+<Power Purchase, connectedTo, Energy Efficiency Audit>
+<Power Purchase, connectedTo, Power Backup>
+<Power Purchase, connectedTo, Regulatory Compliance>
+<Power Purchase, connectedTo, Solar Panel Installation>
+<Regulatory Compliance, connectedTo, Carbon Capture>
+<Solar Panel Installation, connectedTo, Battery Monitoring>
+<Substation Automation, connectedTo, Consumption Logging>
+<Wind Turbine Monitoring, connectedTo, Hydropower Generation>
diff --git a/test/diagrams/graph_hard/diagrams_200.dot b/test/diagrams/graph_hard/diagrams_200.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1ffbf0933e163149d353c004d00efcb93047fbf5
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_200.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=RL
+	N0 [label="Investor Verification" color="#FFEB3B" fillcolor="#FFF9C4" shape=action style=filled]
+	N1 [label="Reward_Based Crowdfunding" color="#FBC02D" fillcolor="#FFFDE7" shape=inputoutput style=filled]
+	N2 [label="Fulfillment Planning" color="#2196F3" fillcolor="#BBDEFB" shape=rect style=filled]
+	N3 [label="Legal Compliance" color="#2196F3" fillcolor="#BBDEFB" shape=predefinedprocess style=filled]
+	N4 [label="Platform Selection" color="#FFEB3B" fillcolor="#FFF9C4" shape=rect style=filled]
+	N5 [label="Press Outreach" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N6 [label="Real Estate Crowdfunding" color="#FBC02D" fillcolor="#FFFDE7" shape=preparation style=filled]
+	N7 [label="Financial Projection Analysis" color="#2196F3" fillcolor="#BBDEFB" shape=preparation style=filled]
+	N8 [label="Securities Regulations Adherence" color="#FFEB3B" fillcolor="#FFF9C4" shape=rect style=filled]
+	N9 [label="Post_Campaign Updates" color="#FBC02D" fillcolor="#FFFDE7" shape=multipledocuments style=filled]
+	S0 [label="" color="#2196F3" fillcolor="#BBDEFB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FBC02D" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#2196F3" fillcolor="#BBDEFB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Campaign Creation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Campaign Creation"
+		nest0_0 [label="Pitch Deck Preparation" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+		nest0_1 [label="Reward Tier Design" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+		nest0_2 [label="Success Fee Structures" color="#FFEB3B" fillcolor="#FFF9C4" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Product Development Lifecycle {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Product Development Lifecycle"
+		nest1_0 [label="Project Vetting" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+		nest1_1 [label="Tax Implications of Crowdfunding" color="#2196F3" fillcolor="#BBDEFB" shape=document style=filled]
+		nest1_2 [label="Logistics for Rewards" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FFEB3B" penwidth=1.5 style=dashed label="sets goals" dir=forward]
+	N2 -> N3 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N4 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N8 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S0 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N3 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S2 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	S2 -> N9 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N8 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N4 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	M1 -> N4 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_200.txt b/test/diagrams/graph_hard/diagrams_200.txt
new file mode 100644
index 0000000000000000000000000000000000000000..328179d449dda9d319076a84178da14e2137712d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_200.txt
@@ -0,0 +1,28 @@
+<Financial Projection Analysis, connectedTo, Securities Regulations Adherence>
+<Fulfillment Planning, connectedTo, Legal Compliance>
+<Fulfillment Planning, connectedTo, Platform Selection>
+<Investor Verification, connectedTo, Platform Selection>
+<Investor Verification, connectedTo, Reward_Based Crowdfunding>
+<Legal Compliance, connectedTo, Platform Selection>
+<Logistics for Rewards, connectedTo, Securities Regulations Adherence>
+<Pitch Deck Preparation, connectedTo, Reward Tier Design>
+<Platform Selection, connectedTo, Financial Projection Analysis>
+<Platform Selection, connectedTo, Post_Campaign Updates>
+<Platform Selection, connectedTo, Press Outreach>
+<Platform Selection, connectedTo, Securities Regulations Adherence>
+<Press Outreach, connectedTo, Project Vetting>
+<Press Outreach, connectedTo, Real Estate Crowdfunding>
+<Project Vetting, connectedTo, Tax Implications of Crowdfunding>
+<Real Estate Crowdfunding, connectedTo, Financial Projection Analysis>
+<Reward Tier Design, connectedTo, Success Fee Structures>
+<Reward_Based Crowdfunding, connectedTo, Legal Compliance>
+<Reward_Based Crowdfunding, connectedTo, Platform Selection>
+<Reward_Based Crowdfunding, connectedTo, Post_Campaign Updates>
+<Reward_Based Crowdfunding, connectedTo, Press Outreach>
+<Reward_Based Crowdfunding, connectedTo, Real Estate Crowdfunding>
+<Reward_Based Crowdfunding, connectedTo, Securities Regulations Adherence>
+<Reward_Based Crowdfunding, sets goals, Fulfillment Planning>
+<Securities Regulations Adherence, connectedTo, Pitch Deck Preparation>
+<Securities Regulations Adherence, connectedTo, Post_Campaign Updates>
+<Success Fee Structures, connectedTo, Platform Selection>
+<Tax Implications of Crowdfunding, connectedTo, Logistics for Rewards>
diff --git a/test/diagrams/graph_hard/diagrams_201.dot b/test/diagrams/graph_hard/diagrams_201.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d5e09be59f44c8d305231f1db6667ce2bc20669d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_201.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Debt Crowdfunding" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N1 [label="Platform Selection" color="#90A4AE" fillcolor="#ECEFF1" shape=inputoutput style=filled]
+	N2 [label="Backer Communication" color="#90A4AE" fillcolor="#ECEFF1" shape=vnode_shape style=filled]
+	N3 [label="Email List Building" color="#7986CB" fillcolor="#E8EAF6" shape=inputoutput style=filled]
+	N4 [label="Success Fee Structures" color="#7986CB" fillcolor="#E8EAF6" shape=inputoutput style=filled]
+	N5 [label="Intellectual Property Protection" color="#7986CB" fillcolor="#E8EAF6" shape=rectangle style=filled]
+	N6 [label="Social Media Promotion" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N7 [label="Platform Fee Management" color="#90A4AE" fillcolor="#ECEFF1" shape=rect style=filled]
+	N8 [label="Donation_Based Crowdfunding" color="#7E57C2" fillcolor="#D1C4E9" shape=database style=filled]
+	N9 [label="Investor Verification" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N10 [label="Marketing Strategy" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N11 [label="Logistics for Rewards" color="#7986CB" fillcolor="#E8EAF6" shape=document style=filled]
+	N12 [label="Funding Period Management" color="#90A4AE" fillcolor="#ECEFF1" shape=rectangle style=filled]
+	N13 [label="Campaign Creation" color="#90A4AE" fillcolor="#ECEFF1" shape=predefinedprocess style=filled]
+	N14 [label="International Crowdfunding" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N15 [label="Legal Compliance" color="#7E57C2" fillcolor="#D1C4E9" shape=action style=filled]
+	N16 [label="Due Diligence for Projects" color="#7E57C2" fillcolor="#D1C4E9" shape=predefinedprocess style=filled]
+	S0 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Reward Tier Design {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Reward Tier Design"
+		nest0_0 [label="Real Estate Crowdfunding" color="#7986CB" fillcolor="#E8EAF6" shape=inputoutput style=filled]
+		nest0_1 [label="Shareholder Management" color="#7E57C2" fillcolor="#D1C4E9" shape=vnode_shape style=filled]
+		nest0_2 [label="Post_Campaign Updates" color="#7E57C2" fillcolor="#D1C4E9" shape=rectangle style=filled]
+		nest0_3 [label="Project Vetting" color="#90A4AE" fillcolor="#ECEFF1" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Manufacturing Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Manufacturing Planning"
+		nest1_0 [label="Goal Setting" color="#7986CB" fillcolor="#E8EAF6" shape=rectangle style=filled]
+		nest1_1 [label="Payment Processing" color="#90A4AE" fillcolor="#ECEFF1" shape=action style=filled]
+		nest1_2 [label="Fulfillment Planning" color="#7986CB" fillcolor="#E8EAF6" shape=inputoutput style=filled]
+		nest1_3 [label="Video Production for Campaigns" color="#7E57C2" fillcolor="#D1C4E9" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N10 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N9 -> S1 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	S1 -> N16 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	S1 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#7E57C2" penwidth=1.5 style=solid label="measures success" dir=forward]
+	N5 -> M1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N6 -> M1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N11 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_202.dot b/test/diagrams/graph_hard/diagrams_202.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dea53eb3af2e725e19fe50370f412fb8cbf3b789
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_202.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=LR
+	N0 [label="Real_time Data Streaming" color="#A1D7CD" fillcolor="#EDF5F3" shape=predefinedprocess style=filled]
+	N1 [label="Blockchain for IoT Security" color="#CDDC39" fillcolor="#E6EE9C" shape=predefinedprocess style=filled]
+	N2 [label="IoT Device Certification" color="#FBC02D" fillcolor="#FFFDE7" shape=multipledocuments style=filled]
+	N3 [label="Smart City Sensors" color="#CDDC39" fillcolor="#E6EE9C" shape=rect style=filled]
+	N4 [label="Industrial IoT" color="#CDDC39" fillcolor="#E6EE9C" shape=rectangle style=filled]
+	N5 [label="User Interface for IoT Apps" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N6 [label="Data Collection" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+	N7 [label="AI at the Edge" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N8 [label="Healthcare IoT Devices" color="#A1D7CD" fillcolor="#EDF5F3" shape=diamond style=filled]
+	N9 [label="Remote Monitoring and Control" color="#A1D7CD" fillcolor="#EDF5F3" shape=preparation style=filled]
+	N10 [label="Network Protocol Selection" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N11 [label="Smart Manufacturing" color="#A1D7CD" fillcolor="#EDF5F3" shape=diamond style=filled]
+	N12 [label="Connected Vehicles" color="#A1D7CD" fillcolor="#EDF5F3" shape=action style=filled]
+	N13 [label="Device Management" color="#CDDC39" fillcolor="#E6EE9C" shape=document style=filled]
+	S0 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Power Management for Devices {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Power Management for Devices"
+		nest0_0 [label="Data Privacy in IoT" color="#FBC02D" fillcolor="#FFFDE7" shape=rectangle style=filled]
+		nest0_1 [label="Edge Computing for IoT" color="#CDDC39" fillcolor="#E6EE9C" shape=document style=filled]
+		nest0_2 [label="Environmental Monitoring" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+		nest0_3 [label="Data Processing at Edge" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	}
+	subgraph cluster_API Development for IoT {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="API Development for IoT"
+		nest1_0 [label="Device Prototyping" color="#A1D7CD" fillcolor="#EDF5F3" shape=rectangle style=filled]
+		nest1_1 [label="Supply Chain Optimization" color="#A1D7CD" fillcolor="#EDF5F3" shape=inputoutput style=filled]
+		nest1_2 [label="Energy Management Systems" color="#A1D7CD" fillcolor="#EDF5F3" shape=database style=filled]
+	}
+	N0 -> N1 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid label="integrates sensors" dir=forward]
+	N5 -> N6 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest0_0 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest1_0 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N2 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S2 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	S2 -> N3 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> M2 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	M2 -> N8 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_202.txt b/test/diagrams/graph_hard/diagrams_202.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4cb606980b3b5f8d880cc21a39a6bf94816f2a4d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_202.txt
@@ -0,0 +1,31 @@
+<AI at the Edge, connectedTo, Device Prototyping>
+<AI at the Edge, connectedTo, Healthcare IoT Devices>
+<Blockchain for IoT Security, connectedTo, Healthcare IoT Devices>
+<Blockchain for IoT Security, connectedTo, IoT Device Certification>
+<Connected Vehicles, connectedTo, Device Management>
+<Data Collection, connectedTo, AI at the Edge>
+<Data Collection, connectedTo, Device Management>
+<Data Collection, connectedTo, Network Protocol Selection>
+<Data Collection, connectedTo, Remote Monitoring and Control>
+<Data Collection, connectedTo, Smart Manufacturing>
+<Data Privacy in IoT, connectedTo, Edge Computing for IoT>
+<Data Processing at Edge, connectedTo, Blockchain for IoT Security>
+<Device Prototyping, connectedTo, Supply Chain Optimization>
+<Edge Computing for IoT, connectedTo, Environmental Monitoring>
+<Energy Management Systems, connectedTo, IoT Device Certification>
+<Environmental Monitoring, connectedTo, Data Processing at Edge>
+<Healthcare IoT Devices, connectedTo, Remote Monitoring and Control>
+<Industrial IoT, connectedTo, Healthcare IoT Devices>
+<Industrial IoT, integrates sensors, User Interface for IoT Apps>
+<IoT Device Certification, connectedTo, Smart City Sensors>
+<Network Protocol Selection, connectedTo, Smart Manufacturing>
+<Real_time Data Streaming, connectedTo, Blockchain for IoT Security>
+<Real_time Data Streaming, connectedTo, Smart City Sensors>
+<Real_time Data Streaming, connectedTo, Smart Manufacturing>
+<Remote Monitoring and Control, connectedTo, Network Protocol Selection>
+<Smart City Sensors, connectedTo, Data Privacy in IoT>
+<Smart City Sensors, connectedTo, Industrial IoT>
+<Smart Manufacturing, connectedTo, Connected Vehicles>
+<Supply Chain Optimization, connectedTo, Energy Management Systems>
+<User Interface for IoT Apps, connectedTo, Data Collection>
+<User Interface for IoT Apps, connectedTo, Healthcare IoT Devices>
diff --git a/test/diagrams/graph_hard/diagrams_203.txt b/test/diagrams/graph_hard/diagrams_203.txt
new file mode 100644
index 0000000000000000000000000000000000000000..65ed70c2a6b1ebc917087fa9c7aff40afaff58b7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_203.txt
@@ -0,0 +1,36 @@
+<Agricultural IoT, connectedTo, Interoperability Standards>
+<Agricultural IoT, connectedTo, Sensor Integration>
+<Asset Tracking, connectedTo, Healthcare IoT Devices>
+<Blockchain for IoT Security, connectedTo, Interoperability Standards>
+<Blockchain for IoT Security, connectedTo, Power Management for Devices>
+<Blockchain for IoT Security, connectedTo, Smart Manufacturing>
+<Connected Vehicles, connectedTo, Power Management for Devices>
+<Data Analysis in Cloud, connectedTo, Device Prototyping>
+<Data Privacy in IoT, connectedTo, Connected Vehicles>
+<Data Privacy in IoT, connectedTo, Power Management for Devices>
+<Data Privacy in IoT, connectedTo, Remote Monitoring and Control>
+<Data Processing at Edge, connectedTo, Interoperability Standards>
+<Data Processing at Edge, connectedTo, Security Implementation>
+<Device Prototyping, connectedTo, Gateway Development>
+<Edge Computing for IoT, connectedTo, Remote Monitoring and Control>
+<Edge Computing for IoT, connectedTo, Retail IoT>
+<Edge Computing for IoT, connectedTo, Supply Chain Optimization>
+<Gateway Development, connectedTo, Security Implementation>
+<Healthcare IoT Devices, connectedTo, Interoperability Standards>
+<Interoperability Standards, connectedTo, Over_the_Air Updates>
+<IoT Device Certification, connectedTo, Network Protocol Selection>
+<Network Protocol Selection, connectedTo, Data Privacy in IoT>
+<Over_the_Air Updates, connectedTo, Edge Computing for IoT>
+<Over_the_Air Updates, connectedTo, Remote Monitoring and Control>
+<Remote Monitoring and Control, connectedTo, Connected Vehicles>
+<Retail IoT, connectedTo, Transportation IoT>
+<Security Implementation, connectedTo, Agricultural IoT>
+<Sensor Integration, connectedTo, Asset Tracking>
+<Sensor Integration, connectedTo, Data Analysis in Cloud>
+<Sensor Integration, connectedTo, Interoperability Standards>
+<Sensor Integration, connectedTo, Remote Monitoring and Control>
+<Smart City Sensors, connectedTo, Supply Chain Optimization>
+<Smart Manufacturing, connectedTo, Data Processing at Edge>
+<Smart Manufacturing, connectedTo, Power Management for Devices>
+<Supply Chain Optimization, builds smart cities, IoT Device Certification>
+<Transportation IoT, connectedTo, Smart City Sensors>
diff --git a/test/diagrams/graph_hard/diagrams_204.dot b/test/diagrams/graph_hard/diagrams_204.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0786f9b20d275af3698d33562f6f35da5026cc33
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_204.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=TB
+	N0 [label="Over_the_Air Updates" color="#BA68C8" fillcolor="#F3E5F5" shape=multipledocuments style=filled]
+	N1 [label="Connected Vehicles" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+	N2 [label="Edge Computing for IoT" color="#61CAC3" fillcolor="#C2E8E6" shape=document style=filled]
+	N3 [label="Connectivity Management" color="#BA68C8" fillcolor="#F3E5F5" shape=preparation style=filled]
+	N4 [label="Cloud Platform Integration" color="#AABEC6" fillcolor="#E0E6E9" shape=database style=filled]
+	N5 [label="Security Implementation" color="#61CAC3" fillcolor="#C2E8E6" shape=database style=filled]
+	N6 [label="Blockchain for IoT Security" color="#61CAC3" fillcolor="#C2E8E6" shape=diamond style=filled]
+	N7 [label="Healthcare IoT Devices" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N8 [label="Device Management" color="#AABEC6" fillcolor="#E0E6E9" shape=parallelogram style=filled]
+	N9 [label="IoT Device Certification" color="#BA68C8" fillcolor="#F3E5F5" shape=vnode_shape style=filled]
+	N10 [label="Transportation IoT" color="#AABEC6" fillcolor="#E0E6E9" shape=vnode_shape style=filled]
+	N11 [label="Environmental Monitoring" color="#BA68C8" fillcolor="#F3E5F5" shape=rect style=filled]
+	N12 [label="Sensor Integration" color="#AABEC6" fillcolor="#E0E6E9" shape=preparation style=filled]
+	N13 [label="Firmware Updates" color="#BA68C8" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N14 [label="Power Management for Devices" color="#AABEC6" fillcolor="#E0E6E9" shape=inputoutput style=filled]
+	S0 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Smart City Sensors {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Smart City Sensors"
+		nest0_0 [label="Asset Tracking" color="#61CAC3" fillcolor="#C2E8E6" shape=preparation style=filled]
+		nest0_1 [label="User Interface for IoT Apps" color="#AABEC6" fillcolor="#E0E6E9" shape=rectangle style=filled]
+		nest0_2 [label="Wearable Technology" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+		nest0_3 [label="Supply Chain Optimization" color="#BA68C8" fillcolor="#F3E5F5" shape=preparation style=filled]
+	}
+	subgraph cluster_Real_time Data Streaming {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Real_time Data Streaming"
+		nest1_0 [label="Agricultural IoT" color="#61CAC3" fillcolor="#C2E8E6" shape=rectangle style=filled]
+		nest1_1 [label="Data Privacy in IoT" color="#BA68C8" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N10 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N4 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> S1 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S2 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_205.dot b/test/diagrams/graph_hard/diagrams_205.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1cad6461cdda22a46dc44f72b2b0c8a0e66a0a46
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_205.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=RL
+	N0 [label="Offline Functionality" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N1 [label="Edge_to_Cloud Data Transfer Optimization" color="#CDDC39" fillcolor="#E6EE9C" shape=preparation style=filled]
+	N2 [label="Distributed Data Storage" color="#61CAC3" fillcolor="#C2E8E6" shape=preparation style=filled]
+	N3 [label="Edge API Management" color="#61CAC3" fillcolor="#C2E8E6" shape=diamond style=filled]
+	N4 [label="Data Synchronization between Edge and Cloud" color="#61CAC3" fillcolor="#C2E8E6" shape=multipledocuments style=filled]
+	N5 [label="Edge Computing Hardware Selection" color="#388E3C" fillcolor="#C8E6C9" shape=rect style=filled]
+	N6 [label="Local AI or ML Inference" color="#61CAC3" fillcolor="#C2E8E6" shape=diamond style=filled]
+	N7 [label="Edge Data Processing" color="#CDDC39" fillcolor="#E6EE9C" shape=rect style=filled]
+	N8 [label="Virtualization at Edge" color="#388E3C" fillcolor="#C8E6C9" shape=action style=filled]
+	N9 [label="Retail Edge Computing" color="#CDDC39" fillcolor="#E6EE9C" shape=predefinedprocess style=filled]
+	N10 [label="Remote Device Management" color="#61CAC3" fillcolor="#C2E8E6" shape=rect style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Network Optimization for Edge {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Network Optimization for Edge"
+		nest0_0 [label="Security for Edge Devices" color="#61CAC3" fillcolor="#C2E8E6" shape=multipledocuments style=filled]
+		nest0_1 [label="Edge Device Provisioning" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+		nest0_2 [label="Edge Application Development" color="#CDDC39" fillcolor="#E6EE9C" shape=preparation style=filled]
+		nest0_3 [label="Healthcare Edge Computing" color="#388E3C" fillcolor="#C8E6C9" shape=rect style=filled]
+	}
+	subgraph cluster_Industrial Edge Computing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Industrial Edge Computing"
+		nest1_0 [label="Bandwidth Optimization" color="#388E3C" fillcolor="#C8E6C9" shape=hexagon style=filled]
+		nest1_1 [label="Power Consumption Optimization" color="#388E3C" fillcolor="#C8E6C9" shape=hexagon style=filled]
+		nest1_2 [label="Edge Network Topology Design" color="#61CAC3" fillcolor="#C2E8E6" shape=database style=filled]
+		nest1_3 [label="Edge AI Model Deployment" color="#388E3C" fillcolor="#C8E6C9" shape=database style=filled]
+	}
+	N0 -> N1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#388E3C" penwidth=1.5 style=dashed label="provides fault tolerance" dir=forward]
+	N5 -> N6 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#CDDC39" penwidth=1.5 style=dashed label="synchronizes data" dir=forward]
+	N7 -> N8 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N5 [color="#CDDC39" penwidth=1.5 style=dashed label="designs architectures" dir=forward]
+	nest1_0 -> nest1_1 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N2 -> nest1_0 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S0 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S1 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N7 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N2 -> N0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_205.txt b/test/diagrams/graph_hard/diagrams_205.txt
new file mode 100644
index 0000000000000000000000000000000000000000..88aee557a011a69414a21779929eb544b89cb5b1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_205.txt
@@ -0,0 +1,27 @@
+<Bandwidth Optimization, connectedTo, Power Consumption Optimization>
+<Data Synchronization between Edge and Cloud, provides fault tolerance, Edge Computing Hardware Selection>
+<Distributed Data Storage, connectedTo, Bandwidth Optimization>
+<Distributed Data Storage, connectedTo, Edge API Management>
+<Distributed Data Storage, connectedTo, Edge Data Processing>
+<Distributed Data Storage, connectedTo, Offline Functionality>
+<Edge AI Model Deployment, connectedTo, Local AI or ML Inference>
+<Edge API Management, connectedTo, Data Synchronization between Edge and Cloud>
+<Edge API Management, connectedTo, Retail Edge Computing>
+<Edge API Management, connectedTo, Security for Edge Devices>
+<Edge API Management, connectedTo, Virtualization at Edge>
+<Edge Application Development, connectedTo, Healthcare Edge Computing>
+<Edge Computing Hardware Selection, connectedTo, Local AI or ML Inference>
+<Edge Data Processing, connectedTo, Virtualization at Edge>
+<Edge Device Provisioning, connectedTo, Edge Application Development>
+<Edge Network Topology Design, connectedTo, Edge AI Model Deployment>
+<Edge_to_Cloud Data Transfer Optimization, connectedTo, Distributed Data Storage>
+<Edge_to_Cloud Data Transfer Optimization, connectedTo, Edge Computing Hardware Selection>
+<Edge_to_Cloud Data Transfer Optimization, connectedTo, Retail Edge Computing>
+<Healthcare Edge Computing, designs architectures, Edge Computing Hardware Selection>
+<Local AI or ML Inference, synchronizes data, Edge Data Processing>
+<Offline Functionality, connectedTo, Edge Data Processing>
+<Offline Functionality, connectedTo, Edge_to_Cloud Data Transfer Optimization>
+<Power Consumption Optimization, connectedTo, Edge Network Topology Design>
+<Retail Edge Computing, connectedTo, Remote Device Management>
+<Security for Edge Devices, connectedTo, Edge Device Provisioning>
+<Virtualization at Edge, connectedTo, Retail Edge Computing>
diff --git a/test/diagrams/graph_hard/diagrams_206.dot b/test/diagrams/graph_hard/diagrams_206.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d3e1813b10cdde22f44e9ddc0319866563a33d1c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_206.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=BT
+	N0 [label="Edge Device Provisioning" color="#26A69A" fillcolor="#E0F2F1" shape=rectangle style=filled]
+	N1 [label="Edge Gateway Management" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N2 [label="Offline Functionality" color="#00BCD4" fillcolor="#E0F7FA" shape=vnode_shape style=filled]
+	N3 [label="Orchestration of Edge Workloads" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N4 [label="Local AI or ML Inference" color="#A188DB" fillcolor="#DED7F0" shape=multipledocuments style=filled]
+	N5 [label="Data Filtering at Edge" color="#00BCD4" fillcolor="#E0F7FA" shape=document style=filled]
+	N6 [label="Healthcare Edge Computing" color="#A188DB" fillcolor="#DED7F0" shape=diamond style=filled]
+	N7 [label="Industrial Edge Computing" color="#A188DB" fillcolor="#DED7F0" shape=multipledocuments style=filled]
+	N8 [label="Sensor Data Aggregation" color="#A188DB" fillcolor="#DED7F0" shape=inputoutput style=filled]
+	N9 [label="Edge Computing Hardware Selection" color="#26A69A" fillcolor="#E0F2F1" shape=document style=filled]
+	N10 [label="Edge AI Model Deployment" color="#00BCD4" fillcolor="#E0F7FA" shape=inputoutput style=filled]
+	N11 [label="Bandwidth Optimization" color="#A188DB" fillcolor="#DED7F0" shape=rect style=filled]
+	N12 [label="Edge Device Deployment" color="#26A69A" fillcolor="#E0F2F1" shape=preparation style=filled]
+	N13 [label="Telecom Edge Computing" color="#00BCD4" fillcolor="#E0F7FA" shape=preparation style=filled]
+	N14 [label="Virtualization at Edge" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N15 [label="Edge API Management" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N16 [label="Latency Reduction" color="#A188DB" fillcolor="#DED7F0" shape=action style=filled]
+	S0 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#26A69A" fillcolor="#E0F2F1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Edge Security Analytics {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Edge Security Analytics"
+		nest0_0 [label="Microservices on Edge Devices" color="#26A69A" fillcolor="#E0F2F1" shape=vnode_shape style=filled]
+		nest0_1 [label="Resource Management at Edge" color="#00BCD4" fillcolor="#E0F7FA" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Distributed Data Storage {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Distributed Data Storage"
+		nest1_0 [label="Smart City Edge Solutions" color="#26A69A" fillcolor="#E0F2F1" shape=rect style=filled]
+		nest1_1 [label="Edge Data Processing" color="#00BCD4" fillcolor="#E0F7FA" shape=vnode_shape style=filled]
+		nest1_2 [label="Compliance and Governance at Edge" color="#00BCD4" fillcolor="#E0F7FA" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#00BCD4" penwidth=1.5 style=solid label="enhances privacy" dir=forward]
+	N7 -> N8 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest0_0 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N14 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#00BCD4" penwidth=1.5 style=solid label="enables offline operations" dir=forward]
+	nest1_1 -> nest1_2 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N15 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N11 -> S0 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#00BCD4" penwidth=1.5 style=dashed label="manages distributed systems" dir=forward]
+	S0 -> N16 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> S1 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#A188DB" penwidth=1.5 style=dashed label="optimizes bandwidth" dir=forward]
+	S1 -> N16 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	M0 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N6 -> M2 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N8 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_206.txt b/test/diagrams/graph_hard/diagrams_206.txt
new file mode 100644
index 0000000000000000000000000000000000000000..731bc6768a494f1ef112461907b6e1cab979e528
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_206.txt
@@ -0,0 +1,35 @@
+<Bandwidth Optimization, connectedTo, Edge Device Deployment>
+<Bandwidth Optimization, connectedTo, Latency Reduction>
+<Bandwidth Optimization, manages distributed systems, Edge API Management>
+<Compliance and Governance at Edge, connectedTo, Edge API Management>
+<Data Filtering at Edge, connectedTo, Healthcare Edge Computing>
+<Data Filtering at Edge, connectedTo, Sensor Data Aggregation>
+<Edge AI Model Deployment, connectedTo, Bandwidth Optimization>
+<Edge API Management, connectedTo, Latency Reduction>
+<Edge Computing Hardware Selection, connectedTo, Edge AI Model Deployment>
+<Edge Data Processing, connectedTo, Compliance and Governance at Edge>
+<Edge Device Deployment, connectedTo, Edge API Management>
+<Edge Device Deployment, connectedTo, Latency Reduction>
+<Edge Device Deployment, connectedTo, Telecom Edge Computing>
+<Edge Device Deployment, optimizes bandwidth, Virtualization at Edge>
+<Edge Device Provisioning, connectedTo, Edge Computing Hardware Selection>
+<Edge Device Provisioning, connectedTo, Edge Gateway Management>
+<Edge Gateway Management, connectedTo, Edge Computing Hardware Selection>
+<Edge Gateway Management, connectedTo, Offline Functionality>
+<Healthcare Edge Computing, connectedTo, Microservices on Edge Devices>
+<Healthcare Edge Computing, connectedTo, Sensor Data Aggregation>
+<Healthcare Edge Computing, enhances privacy, Industrial Edge Computing>
+<Industrial Edge Computing, connectedTo, Edge Computing Hardware Selection>
+<Industrial Edge Computing, connectedTo, Sensor Data Aggregation>
+<Local AI or ML Inference, connectedTo, Data Filtering at Edge>
+<Microservices on Edge Devices, connectedTo, Resource Management at Edge>
+<Offline Functionality, connectedTo, Orchestration of Edge Workloads>
+<Offline Functionality, connectedTo, Sensor Data Aggregation>
+<Offline Functionality, connectedTo, Smart City Edge Solutions>
+<Orchestration of Edge Workloads, connectedTo, Local AI or ML Inference>
+<Orchestration of Edge Workloads, connectedTo, Sensor Data Aggregation>
+<Resource Management at Edge, connectedTo, Virtualization at Edge>
+<Sensor Data Aggregation, connectedTo, Edge Computing Hardware Selection>
+<Smart City Edge Solutions, enables offline operations, Edge Data Processing>
+<Telecom Edge Computing, connectedTo, Virtualization at Edge>
+<Virtualization at Edge, connectedTo, Edge API Management>
diff --git a/test/diagrams/graph_hard/diagrams_207.dot b/test/diagrams/graph_hard/diagrams_207.dot
new file mode 100644
index 0000000000000000000000000000000000000000..58829f8918bce316acd43dd90db73e7d6c679ff0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_207.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=LR
+	N0 [label="Edge_to_Cloud Data Transfer Optimization" color="#E57373" fillcolor="#FFEBEE" shape=inputoutput style=filled]
+	N1 [label="Connectivity to Cloud" color="#4DD0E1" fillcolor="#C9F0F0" shape=parallelogram style=filled]
+	N2 [label="Fault Tolerance at Edge" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N3 [label="Security for Edge Devices" color="#FFCC7A" fillcolor="#FFF6D9" shape=predefinedprocess style=filled]
+	N4 [label="Sensor Data Aggregation" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+	N5 [label="Telecom Edge Computing" color="#4DD0E1" fillcolor="#C9F0F0" shape=inputoutput style=filled]
+	N6 [label="Edge Data Processing" color="#FFCC7A" fillcolor="#FFF6D9" shape=parallelogram style=filled]
+	N7 [label="Orchestration of Edge Workloads" color="#FFCC7A" fillcolor="#FFF6D9" shape=action style=filled]
+	N8 [label="Power Consumption Optimization" color="#4DD0E1" fillcolor="#C9F0F0" shape=rectangle style=filled]
+	N9 [label="Compliance and Governance at Edge" color="#4DD0E1" fillcolor="#C9F0F0" shape=action style=filled]
+	N10 [label="Virtualization at Edge" color="#E57373" fillcolor="#FFEBEE" shape=vnode_shape style=filled]
+	N11 [label="Bandwidth Optimization" color="#FFCC7A" fillcolor="#FFF6D9" shape=rect style=filled]
+	N12 [label="Industrial Edge Computing" color="#FFCC7A" fillcolor="#FFF6D9" shape=preparation style=filled]
+	N13 [label="Local AI or ML Inference" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N14 [label="Healthcare Edge Computing" color="#E57373" fillcolor="#FFEBEE" shape=document style=filled]
+	N15 [label="Latency Reduction" color="#E57373" fillcolor="#FFEBEE" shape=diamond style=filled]
+	N16 [label="Network Optimization for Edge" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	S0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Edge Application Development {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Edge Application Development"
+		nest0_0 [label="Microservices on Edge Devices" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+		nest0_1 [label="Distributed Data Storage" color="#FFCC7A" fillcolor="#FFF6D9" shape=database style=filled]
+	}
+	subgraph cluster_Retail Edge Computing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Retail Edge Computing"
+		nest1_0 [label="Edge Device Provisioning" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+		nest1_1 [label="Edge Computing Hardware Selection" color="#FFCC7A" fillcolor="#FFF6D9" shape=parallelogram style=filled]
+		nest1_2 [label="Fleet Management for Edge Devices" color="#FFCC7A" fillcolor="#FFF6D9" shape=inputoutput style=filled]
+		nest1_3 [label="Edge Network Topology Design" color="#4DD0E1" fillcolor="#C9F0F0" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#4DD0E1" penwidth=1.5 style=solid label="optimizes resources" dir=forward]
+	N3 -> N4 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed label="selects hardware" dir=forward]
+	N2 -> nest0_0 [color="#4DD0E1" penwidth=1.5 style=solid label="powers healthcare devices" dir=forward]
+	nest0_1 -> N1 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=solid label="supports industrial IoT" dir=forward]
+	N9 -> nest1_0 [color="#FFCC7A" penwidth=1.5 style=dashed label="runs AI models" dir=forward]
+	nest1_3 -> N15 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N10 -> S0 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N4 -> S1 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#E57373" penwidth=1.5 style=dashed label="enhances privacy" dir=forward]
+	N1 -> M1 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	M1 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_207.txt b/test/diagrams/graph_hard/diagrams_207.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d391d2afe710e11cd4e960ac7a6c0502d9ef5315
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_207.txt
@@ -0,0 +1,33 @@
+<Bandwidth Optimization, connectedTo, Industrial Edge Computing>
+<Compliance and Governance at Edge, connectedTo, Virtualization at Edge>
+<Compliance and Governance at Edge, runs AI models, Edge Device Provisioning>
+<Connectivity to Cloud, connectedTo, Compliance and Governance at Edge>
+<Connectivity to Cloud, connectedTo, Fault Tolerance at Edge>
+<Distributed Data Storage, connectedTo, Connectivity to Cloud>
+<Edge Computing Hardware Selection, connectedTo, Fleet Management for Edge Devices>
+<Edge Data Processing, connectedTo, Compliance and Governance at Edge>
+<Edge Data Processing, connectedTo, Orchestration of Edge Workloads>
+<Edge Device Provisioning, connectedTo, Edge Computing Hardware Selection>
+<Edge Network Topology Design, connectedTo, Latency Reduction>
+<Edge_to_Cloud Data Transfer Optimization, connectedTo, Connectivity to Cloud>
+<Fault Tolerance at Edge, optimizes resources, Security for Edge Devices>
+<Fault Tolerance at Edge, powers healthcare devices, Microservices on Edge Devices>
+<Fleet Management for Edge Devices, supports industrial IoT, Edge Network Topology Design>
+<Healthcare Edge Computing, connectedTo, Latency Reduction>
+<Industrial Edge Computing, connectedTo, Local AI or ML Inference>
+<Latency Reduction, connectedTo, Network Optimization for Edge>
+<Local AI or ML Inference, connectedTo, Healthcare Edge Computing>
+<Microservices on Edge Devices, selects hardware, Distributed Data Storage>
+<Orchestration of Edge Workloads, connectedTo, Power Consumption Optimization>
+<Power Consumption Optimization, connectedTo, Compliance and Governance at Edge>
+<Security for Edge Devices, connectedTo, Sensor Data Aggregation>
+<Sensor Data Aggregation, connectedTo, Compliance and Governance at Edge>
+<Sensor Data Aggregation, connectedTo, Edge Data Processing>
+<Sensor Data Aggregation, connectedTo, Local AI or ML Inference>
+<Sensor Data Aggregation, connectedTo, Telecom Edge Computing>
+<Telecom Edge Computing, connectedTo, Edge Data Processing>
+<Telecom Edge Computing, enhances privacy, Compliance and Governance at Edge>
+<Virtualization at Edge, connectedTo, Bandwidth Optimization>
+<Virtualization at Edge, connectedTo, Industrial Edge Computing>
+<Virtualization at Edge, connectedTo, Latency Reduction>
+<Virtualization at Edge, connectedTo, Local AI or ML Inference>
diff --git a/test/diagrams/graph_hard/diagrams_208.dot b/test/diagrams/graph_hard/diagrams_208.dot
new file mode 100644
index 0000000000000000000000000000000000000000..79b7b5feba7903dcd04c5e069fbeff5d6304cbb7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_208.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=LR
+	N0 [label="Cloud_based VPN Setup" color="#388E3C" fillcolor="#F1F8E9" shape=inputoutput style=filled]
+	N1 [label="Cloud FinOps" color="#AED581" fillcolor="#F0F4C3" shape=preparation style=filled]
+	N2 [label="Infrastructure as a Service" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+	N3 [label="Identity and Access Management" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N4 [label="Virtual Machine Management" color="#AED581" fillcolor="#F0F4C3" shape=rectangle style=filled]
+	N5 [label="Database as a Service" color="#388E3C" fillcolor="#F1F8E9" shape=predefinedprocess style=filled]
+	N6 [label="Cloud Backup Solutions" color="#388E3C" fillcolor="#F1F8E9" shape=database style=filled]
+	N7 [label="Public Cloud Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=database style=filled]
+	N8 [label="Resource Tagging for Cost Allocation" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N9 [label="Cloud Audit Trails" color="#388E3C" fillcolor="#F1F8E9" shape=rectangle style=filled]
+	N10 [label="Cloud Native Application Development" color="#AED581" fillcolor="#F0F4C3" shape=database style=filled]
+	N11 [label="Cloud Firewall Configuration" color="#AED581" fillcolor="#F0F4C3" shape=vnode_shape style=filled]
+	N12 [label="Cloud Migration Strategy" color="#CD8FF2" fillcolor="#ECCFF5" shape=database style=filled]
+	N13 [label="Private Cloud Management" color="#AED581" fillcolor="#F0F4C3" shape=action style=filled]
+	S0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_DevOps on Cloud {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="DevOps on Cloud"
+		nest0_0 [label="Cloud Vendor Lock_in Mitigation" color="#388E3C" fillcolor="#F1F8E9" shape=inputoutput style=filled]
+		nest0_1 [label="Container Orchestration" color="#388E3C" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Cloud Automation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Cloud Automation"
+		nest1_0 [label="Serverless Computing" color="#CD8FF2" fillcolor="#ECCFF5" shape=inputoutput style=filled]
+		nest1_1 [label="Cloud Architecture Design" color="#388E3C" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid label="configures firewalls" dir=forward]
+	N9 -> N10 [color="#CD8FF2" penwidth=1.5 style=dashed label="enables autoscaling" dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N11 -> nest0_0 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N4 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N0 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=dashed label="automates tasks" dir=forward]
+	N2 -> M0 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	M0 -> N4 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	M1 -> N9 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_208.txt b/test/diagrams/graph_hard/diagrams_208.txt
new file mode 100644
index 0000000000000000000000000000000000000000..515297e35f39bc2a1caed695514fc94860305ecd
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_208.txt
@@ -0,0 +1,29 @@
+<Cloud Architecture Design, connectedTo, Cloud FinOps>
+<Cloud Audit Trails, enables autoscaling, Cloud Native Application Development>
+<Cloud Backup Solutions, connectedTo, Cloud Audit Trails>
+<Cloud Backup Solutions, connectedTo, Public Cloud Management>
+<Cloud FinOps, connectedTo, Cloud Audit Trails>
+<Cloud FinOps, connectedTo, Infrastructure as a Service>
+<Cloud FinOps, connectedTo, Virtual Machine Management>
+<Cloud Firewall Configuration, connectedTo, Cloud Migration Strategy>
+<Cloud Firewall Configuration, connectedTo, Cloud Vendor Lock_in Mitigation>
+<Cloud Migration Strategy, connectedTo, Private Cloud Management>
+<Cloud Native Application Development, connectedTo, Cloud Firewall Configuration>
+<Cloud Vendor Lock_in Mitigation, connectedTo, Container Orchestration>
+<Cloud_based VPN Setup, connectedTo, Cloud Backup Solutions>
+<Cloud_based VPN Setup, connectedTo, Cloud FinOps>
+<Cloud_based VPN Setup, connectedTo, Database as a Service>
+<Cloud_based VPN Setup, connectedTo, Virtual Machine Management>
+<Container Orchestration, connectedTo, Virtual Machine Management>
+<Database as a Service, automates tasks, Public Cloud Management>
+<Database as a Service, connectedTo, Cloud Backup Solutions>
+<Database as a Service, connectedTo, Cloud Firewall Configuration>
+<Database as a Service, connectedTo, Cloud Native Application Development>
+<Identity and Access Management, connectedTo, Virtual Machine Management>
+<Infrastructure as a Service, connectedTo, Identity and Access Management>
+<Infrastructure as a Service, connectedTo, Virtual Machine Management>
+<Public Cloud Management, connectedTo, Resource Tagging for Cost Allocation>
+<Resource Tagging for Cost Allocation, configures firewalls, Cloud Audit Trails>
+<Serverless Computing, connectedTo, Cloud Architecture Design>
+<Virtual Machine Management, connectedTo, Database as a Service>
+<Virtual Machine Management, connectedTo, Serverless Computing>
diff --git a/test/diagrams/graph_hard/diagrams_209.dot b/test/diagrams/graph_hard/diagrams_209.dot
new file mode 100644
index 0000000000000000000000000000000000000000..19cc0492b4017aaa64532cd526513bc11c7afe1e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_209.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=LR
+	N0 [label="Cloud Marketplace Integration" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N1 [label="Network Configuration in Cloud" color="#AABEC6" fillcolor="#E0E6E9" shape=rectangle style=filled]
+	N2 [label="Cost Optimization in Cloud" color="#7E57C2" fillcolor="#EDE7F6" shape=document style=filled]
+	N3 [label="CI or CD Pipelines in Cloud" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N4 [label="Software as a Service" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N5 [label="Container Orchestration" color="#AABEC6" fillcolor="#E0E6E9" shape=action style=filled]
+	N6 [label="Big Data Services in Cloud" color="#4DB6AC" fillcolor="#E0F2F1" shape=predefinedprocess style=filled]
+	N7 [label="Cloud Audit Trails" color="#4DB6AC" fillcolor="#E0F2F1" shape=multipledocuments style=filled]
+	N8 [label="Cloud_based VPN Setup" color="#7E57C2" fillcolor="#EDE7F6" shape=database style=filled]
+	N9 [label="Multi_Cloud Management" color="#7E57C2" fillcolor="#EDE7F6" shape=diamond style=filled]
+	N10 [label="Private Cloud Management" color="#4DB6AC" fillcolor="#E0F2F1" shape=preparation style=filled]
+	N11 [label="API Management in Cloud" color="#7E57C2" fillcolor="#EDE7F6" shape=diamond style=filled]
+	N12 [label="Database as a Service" color="#7E57C2" fillcolor="#EDE7F6" shape=inputoutput style=filled]
+	N13 [label="Cloud Migration Strategy" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N14 [label="Hybrid Cloud Deployment" color="#AABEC6" fillcolor="#E0E6E9" shape=multipledocuments style=filled]
+	S0 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4DB6AC" fillcolor="#E0F2F1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#4DB6AC" fillcolor="#E0F2F1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Infrastructure as a Service {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Infrastructure as a Service"
+		nest0_0 [label="DevOps on Cloud" color="#4DB6AC" fillcolor="#E0F2F1" shape=action style=filled]
+		nest0_1 [label="Cloud Native Application Development" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	}
+	subgraph cluster_Resource Tagging for Cost Allocation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Resource Tagging for Cost Allocation"
+		nest1_0 [label="Machine Learning as a Service" color="#7E57C2" fillcolor="#EDE7F6" shape=inputoutput style=filled]
+		nest1_1 [label="Identity and Access Management" color="#AABEC6" fillcolor="#E0E6E9" shape=inputoutput style=filled]
+		nest1_2 [label="Cloud Monitoring and Logging" color="#AABEC6" fillcolor="#E0E6E9" shape=action style=filled]
+		nest1_3 [label="Platform as a Service" color="#AABEC6" fillcolor="#E0E6E9" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest1_0 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N11 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#000000" penwidth=1.5 style=solid label="deploys private clouds" dir=forward]
+	S0 -> N7 [color="#7E57C2" penwidth=1.5 style=solid label="implements DevOps" dir=forward]
+	N3 -> S1 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N10 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	M0 -> N12 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	M1 -> N13 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_209.txt b/test/diagrams/graph_hard/diagrams_209.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d444baf2c3be323937068c0f2bf7e57d6d0c845d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_209.txt
@@ -0,0 +1,32 @@
+<API Management in Cloud, connectedTo, Database as a Service>
+<Big Data Services in Cloud, connectedTo, Cloud Audit Trails>
+<CI or CD Pipelines in Cloud, connectedTo, Cloud Audit Trails>
+<CI or CD Pipelines in Cloud, connectedTo, Cloud Migration Strategy>
+<CI or CD Pipelines in Cloud, connectedTo, Software as a Service>
+<CI or CD Pipelines in Cloud, deploys private clouds, Multi_Cloud Management>
+<CI or CD Pipelines in Cloud, implements DevOps, Cloud Audit Trails>
+<Cloud Audit Trails, connectedTo, Cloud_based VPN Setup>
+<Cloud Marketplace Integration, connectedTo, Network Configuration in Cloud>
+<Cloud Migration Strategy, connectedTo, Hybrid Cloud Deployment>
+<Cloud Migration Strategy, connectedTo, Machine Learning as a Service>
+<Cloud Monitoring and Logging, connectedTo, Platform as a Service>
+<Cloud Native Application Development, connectedTo, API Management in Cloud>
+<Cloud_based VPN Setup, connectedTo, Multi_Cloud Management>
+<Container Orchestration, connectedTo, Big Data Services in Cloud>
+<Container Orchestration, connectedTo, Cloud Migration Strategy>
+<Cost Optimization in Cloud, connectedTo, CI or CD Pipelines in Cloud>
+<Cost Optimization in Cloud, connectedTo, Cloud Migration Strategy>
+<Database as a Service, connectedTo, Cloud Migration Strategy>
+<Database as a Service, connectedTo, DevOps on Cloud>
+<DevOps on Cloud, connectedTo, Cloud Native Application Development>
+<Identity and Access Management, connectedTo, Cloud Monitoring and Logging>
+<Machine Learning as a Service, connectedTo, Identity and Access Management>
+<Multi_Cloud Management, connectedTo, Private Cloud Management>
+<Network Configuration in Cloud, connectedTo, Cloud Migration Strategy>
+<Network Configuration in Cloud, connectedTo, Cost Optimization in Cloud>
+<Network Configuration in Cloud, connectedTo, Database as a Service>
+<Platform as a Service, connectedTo, API Management in Cloud>
+<Private Cloud Management, connectedTo, API Management in Cloud>
+<Private Cloud Management, connectedTo, Database as a Service>
+<Software as a Service, connectedTo, Container Orchestration>
+<Software as a Service, connectedTo, Database as a Service>
diff --git a/test/diagrams/graph_hard/diagrams_21.dot b/test/diagrams/graph_hard/diagrams_21.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cf149dde7d60f8a60adf10ac429fa2079232d925
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_21.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=RL
+	N0 [label="Carbon Capture" color="#FFD54F" fillcolor="#FFF8E1" shape=parallelogram style=filled]
+	N1 [label="Hydropower Generation" color="#FF8A65" fillcolor="#FBE9E7" shape=action style=filled]
+	N2 [label="Outage Detection" color="#FFD54F" fillcolor="#FFF8E1" shape=vnode_shape style=filled]
+	N3 [label="Wind Turbine Monitoring" color="#FFD54F" fillcolor="#FFF8E1" shape=document style=filled]
+	N4 [label="Regulatory Compliance" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+	N5 [label="Grid Balancing" color="#FF8A65" fillcolor="#FBE9E7" shape=vnode_shape style=filled]
+	N6 [label="Circuit Breaker Operation" color="#6EB76D" fillcolor="#E9F7E8" shape=hexagon style=filled]
+	N7 [label="Usage Billing" color="#FFD54F" fillcolor="#FFF8E1" shape=vnode_shape style=filled]
+	N8 [label="Load Shedding" color="#6EB76D" fillcolor="#E9F7E8" shape=database style=filled]
+	N9 [label="Distributed Generation Management" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+	S0 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FF8A65" fillcolor="#FBE9E7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Energy Efficiency Audit {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Energy Efficiency Audit"
+		nest0_0 [label="Nuclear Reactor Control" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+		nest0_1 [label="Voltage Regulation" color="#FFD54F" fillcolor="#FFF8E1" shape=multipledocuments style=filled]
+		nest0_2 [label="Energy Trading" color="#6EB76D" fillcolor="#E9F7E8" shape=hexagon style=filled]
+		nest0_3 [label="Transformer Station" color="#6EB76D" fillcolor="#E9F7E8" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Consumption Logging {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Consumption Logging"
+		nest1_0 [label="Power Plant" color="#FF8A65" fillcolor="#FBE9E7" shape=diamond style=filled]
+		nest1_1 [label="Energy Storage" color="#FFD54F" fillcolor="#FFF8E1" shape=action style=filled]
+		nest1_2 [label="Battery Monitoring" color="#6EB76D" fillcolor="#E9F7E8" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#6EB76D" penwidth=1.5 style=dashed label="complies" dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest0_0 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N5 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N2 -> nest1_0 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N8 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S1 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	M0 -> N9 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	M1 -> N3 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_21.txt b/test/diagrams/graph_hard/diagrams_21.txt
new file mode 100644
index 0000000000000000000000000000000000000000..103d05d4c678f442d6bdbf8ec3d59859e19eb692
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_21.txt
@@ -0,0 +1,27 @@
+<Battery Monitoring, connectedTo, Load Shedding>
+<Carbon Capture, connectedTo, Hydropower Generation>
+<Carbon Capture, connectedTo, Wind Turbine Monitoring>
+<Circuit Breaker Operation, connectedTo, Distributed Generation Management>
+<Circuit Breaker Operation, connectedTo, Load Shedding>
+<Circuit Breaker Operation, connectedTo, Usage Billing>
+<Energy Storage, connectedTo, Battery Monitoring>
+<Energy Trading, connectedTo, Transformer Station>
+<Grid Balancing, connectedTo, Circuit Breaker Operation>
+<Grid Balancing, connectedTo, Distributed Generation Management>
+<Grid Balancing, connectedTo, Load Shedding>
+<Grid Balancing, connectedTo, Usage Billing>
+<Hydropower Generation, complies, Outage Detection>
+<Hydropower Generation, connectedTo, Wind Turbine Monitoring>
+<Load Shedding, connectedTo, Distributed Generation Management>
+<Load Shedding, connectedTo, Nuclear Reactor Control>
+<Nuclear Reactor Control, connectedTo, Voltage Regulation>
+<Outage Detection, connectedTo, Power Plant>
+<Outage Detection, connectedTo, Wind Turbine Monitoring>
+<Power Plant, connectedTo, Energy Storage>
+<Regulatory Compliance, connectedTo, Distributed Generation Management>
+<Regulatory Compliance, connectedTo, Grid Balancing>
+<Transformer Station, connectedTo, Grid Balancing>
+<Usage Billing, connectedTo, Distributed Generation Management>
+<Usage Billing, connectedTo, Load Shedding>
+<Voltage Regulation, connectedTo, Energy Trading>
+<Wind Turbine Monitoring, connectedTo, Regulatory Compliance>
diff --git a/test/diagrams/graph_hard/diagrams_210.dot b/test/diagrams/graph_hard/diagrams_210.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ca65c9a3697c4d2b428befa8404ef2fe1ce2411a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_210.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=LR
+	N0 [label="Big Data Services in Cloud" color="#E91E63" fillcolor="#FCE4EC" shape=preparation style=filled]
+	N1 [label="Software as a Service" color="#BCB88A" fillcolor="#F5F5DC" shape=action style=filled]
+	N2 [label="Network Configuration in Cloud" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N3 [label="Identity and Access Management" color="#E91E63" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N4 [label="Virtual Machine Management" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N5 [label="Cloud Architecture Design" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+	N6 [label="Cloud Marketplace Integration" color="#E91E63" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+	N7 [label="Cost Optimization in Cloud" color="#BCB88A" fillcolor="#F5F5DC" shape=document style=filled]
+	N8 [label="Auto_Scaling Configurations" color="#E91E63" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+	N9 [label="Platform as a Service" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+	N10 [label="CI or CD Pipelines in Cloud" color="#BCB88A" fillcolor="#F5F5DC" shape=preparation style=filled]
+	N11 [label="Cloud Firewall Configuration" color="#BCB88A" fillcolor="#F5F5DC" shape=rect style=filled]
+	N12 [label="Public Cloud Management" color="#E91E63" fillcolor="#FCE4EC" shape=rect style=filled]
+	N13 [label="Data Storage in Cloud" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N14 [label="Cloud Migration Strategy" color="#E91E63" fillcolor="#FCE4EC" shape=database style=filled]
+	N15 [label="API Management in Cloud" color="#BCB88A" fillcolor="#F5F5DC" shape=database style=filled]
+	N16 [label="Machine Learning as a Service" color="#FFDA4E" fillcolor="#FFE88D" shape=document style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Edge_to_Cloud Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Edge_to_Cloud Integration"
+		nest0_0 [label="Database as a Service" color="#BCB88A" fillcolor="#F5F5DC" shape=preparation style=filled]
+		nest0_1 [label="Disaster Recovery in Cloud" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+		nest0_2 [label="Infrastructure as a Service" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Cloud FinOps {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Cloud FinOps"
+		nest1_0 [label="Private Cloud Management" color="#FFDA4E" fillcolor="#FFE88D" shape=diamond style=filled]
+		nest1_1 [label="Cloud Vendor Lock_in Mitigation" color="#FFDA4E" fillcolor="#FFE88D" shape=document style=filled]
+	}
+	N0 -> N1 [color="#E91E63" penwidth=1.5 style=solid label="implements DevOps" dir=forward]
+	N1 -> N2 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#BCB88A" penwidth=1.5 style=dashed label="configures networks" dir=forward]
+	N5 -> N6 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#E91E63" penwidth=1.5 style=dashed label="uses public clouds" dir=forward]
+	N11 -> N12 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=dashed label="automates CI or CD" dir=forward]
+	N15 -> N16 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest0_0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N11 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N14 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N4 -> S1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S1 -> N16 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	M1 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N7 -> M2 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	M2 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_210.txt b/test/diagrams/graph_hard/diagrams_210.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f0e41258e145a77a720dd580a433a3c7ca431fe2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_210.txt
@@ -0,0 +1,36 @@
+<API Management in Cloud, connectedTo, Machine Learning as a Service>
+<Auto_Scaling Configurations, connectedTo, Platform as a Service>
+<Auto_Scaling Configurations, connectedTo, Private Cloud Management>
+<Big Data Services in Cloud, connectedTo, Cloud Marketplace Integration>
+<Big Data Services in Cloud, implements DevOps, Software as a Service>
+<CI or CD Pipelines in Cloud, uses public clouds, Cloud Firewall Configuration>
+<Cloud Architecture Design, connectedTo, Cloud Marketplace Integration>
+<Cloud Firewall Configuration, connectedTo, Public Cloud Management>
+<Cloud Marketplace Integration, connectedTo, Cost Optimization in Cloud>
+<Cloud Migration Strategy, automates CI or CD, API Management in Cloud>
+<Cloud Vendor Lock_in Mitigation, connectedTo, Cloud Migration Strategy>
+<Cost Optimization in Cloud, connectedTo, Auto_Scaling Configurations>
+<Cost Optimization in Cloud, connectedTo, Cloud Migration Strategy>
+<Cost Optimization in Cloud, connectedTo, Public Cloud Management>
+<Data Storage in Cloud, connectedTo, Cloud Migration Strategy>
+<Database as a Service, connectedTo, Disaster Recovery in Cloud>
+<Disaster Recovery in Cloud, connectedTo, Infrastructure as a Service>
+<Identity and Access Management, connectedTo, Cloud Marketplace Integration>
+<Identity and Access Management, connectedTo, Database as a Service>
+<Identity and Access Management, connectedTo, Virtual Machine Management>
+<Infrastructure as a Service, connectedTo, Cloud Firewall Configuration>
+<Network Configuration in Cloud, connectedTo, Identity and Access Management>
+<Platform as a Service, connectedTo, CI or CD Pipelines in Cloud>
+<Private Cloud Management, connectedTo, Cloud Vendor Lock_in Mitigation>
+<Public Cloud Management, connectedTo, Data Storage in Cloud>
+<Software as a Service, connectedTo, Cloud Marketplace Integration>
+<Software as a Service, connectedTo, Cost Optimization in Cloud>
+<Software as a Service, connectedTo, Network Configuration in Cloud>
+<Software as a Service, connectedTo, Public Cloud Management>
+<Virtual Machine Management, configures networks, Cloud Architecture Design>
+<Virtual Machine Management, connectedTo, CI or CD Pipelines in Cloud>
+<Virtual Machine Management, connectedTo, Cloud Marketplace Integration>
+<Virtual Machine Management, connectedTo, Cloud Migration Strategy>
+<Virtual Machine Management, connectedTo, Machine Learning as a Service>
+<Virtual Machine Management, connectedTo, Platform as a Service>
+<Virtual Machine Management, connectedTo, Public Cloud Management>
diff --git a/test/diagrams/graph_hard/diagrams_211.dot b/test/diagrams/graph_hard/diagrams_211.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a27273768b2afc81dd0b68c9881c9a7669148570
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_211.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=TB
+	N0 [label="Network Performance Tuning" color="#FFF9AE" fillcolor="#FFFCE6" shape=diamond style=filled]
+	N1 [label="Data Center Management" color="#FFF9AE" fillcolor="#FFFCE6" shape=multipledocuments style=filled]
+	N2 [label="Storage Solutions" color="#D2D2D2" fillcolor="#F0F0F0" shape=document style=filled]
+	N3 [label="Virtual Desktop Infrastructure" color="#D2D2D2" fillcolor="#F0F0F0" shape=action style=filled]
+	N4 [label="Cabling and Wiring" color="#D2D2D2" fillcolor="#F0F0F0" shape=predefinedprocess style=filled]
+	N5 [label="Virtualization" color="#D2D2D2" fillcolor="#F0F0F0" shape=diamond style=filled]
+	N6 [label="Load Balancer Setup" color="#D2D2D2" fillcolor="#F0F0F0" shape=hexagon style=filled]
+	N7 [label="Cloud Integration with On_premise" color="#BA68C8" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N8 [label="Software Licensing Management" color="#FFF9AE" fillcolor="#FFFCE6" shape=preparation style=filled]
+	N9 [label="Database Administration" color="#FFF9AE" fillcolor="#FFFCE6" shape=document style=filled]
+	S0 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Web Server Configuration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Web Server Configuration"
+		nest0_0 [label="System Administration" color="#FFF9AE" fillcolor="#FFFCE6" shape=diamond style=filled]
+		nest0_1 [label="Capacity Planning" color="#FFF9AE" fillcolor="#FFFCE6" shape=rectangle style=filled]
+		nest0_2 [label="Disaster Recovery Planning" color="#D2D2D2" fillcolor="#F0F0F0" shape=hexagon style=filled]
+	}
+	subgraph cluster_Environmental Monitoring {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Environmental Monitoring"
+		nest1_0 [label="IT Asset Management" color="#D2D2D2" fillcolor="#F0F0F0" shape=database style=filled]
+		nest1_1 [label="Mail Server Management" color="#BA68C8" fillcolor="#F3E5F5" shape=document style=filled]
+	}
+	N0 -> N1 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N2 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N1 [color="#000000" penwidth=1.5 style=dashed label="lays cables" dir=forward]
+	N6 -> S0 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N6 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M2 [color="#D2D2D2" penwidth=1.5 style=solid label="deploys antiviruses" dir=forward]
+	M2 -> N8 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_212.dot b/test/diagrams/graph_hard/diagrams_212.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d19ddf502e2fafc9105c33cf4032ecc84b206e8d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_212.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=BT
+	N0 [label="Antivirus and Endpoint Protection" color="#A1D7CD" fillcolor="#EDF5F3" shape=database style=filled]
+	N1 [label="Network Security" color="#9C27B0" fillcolor="#E1BEE7" shape=database style=filled]
+	N2 [label="DNS Management" color="#DCE775" fillcolor="#F9FBE7" shape=action style=filled]
+	N3 [label="Access Control Systems" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N4 [label="Patch Management" color="#A1D7CD" fillcolor="#EDF5F3" shape=document style=filled]
+	N5 [label="Backup and Recovery Systems" color="#DCE775" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	N6 [label="Cloud Integration with On_premise" color="#DCE775" fillcolor="#F9FBE7" shape=document style=filled]
+	N7 [label="Network Design" color="#9C27B0" fillcolor="#E1BEE7" shape=diamond style=filled]
+	N8 [label="Group Policy Management" color="#9C27B0" fillcolor="#E1BEE7" shape=rectangle style=filled]
+	N9 [label="Data Center Management" color="#A1D7CD" fillcolor="#EDF5F3" shape=database style=filled]
+	N10 [label="Capacity Planning" color="#9C27B0" fillcolor="#E1BEE7" shape=vnode_shape style=filled]
+	N11 [label="Storage Solutions" color="#9C27B0" fillcolor="#E1BEE7" shape=rect style=filled]
+	N12 [label="Proxy Server Configuration" color="#DCE775" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N13 [label="Automation Scripting" color="#9C27B0" fillcolor="#E1BEE7" shape=rect style=filled]
+	N14 [label="Rack and Cabinet Management" color="#9C27B0" fillcolor="#E1BEE7" shape=parallelogram style=filled]
+	N15 [label="Virtual Desktop Infrastructure" color="#9C27B0" fillcolor="#E1BEE7" shape=database style=filled]
+	S0 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Troubleshooting and Support {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Troubleshooting and Support"
+		nest0_0 [label="Server Deployment" color="#A1D7CD" fillcolor="#EDF5F3" shape=diamond style=filled]
+		nest0_1 [label="Directory Services" color="#A1D7CD" fillcolor="#EDF5F3" shape=vnode_shape style=filled]
+		nest0_2 [label="Disaster Recovery Planning" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	}
+	subgraph cluster_Web Server Configuration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Web Server Configuration"
+		nest1_0 [label="Cabling and Wiring" color="#A1D7CD" fillcolor="#EDF5F3" shape=database style=filled]
+		nest1_1 [label="Firewall Management" color="#9C27B0" fillcolor="#E1BEE7" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#9C27B0" penwidth=1.5 style=dashed label="secures systems" dir=forward]
+	N4 -> N5 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest1_0 [color="#000000" penwidth=1.5 style=solid label="deploys VDIs" dir=forward]
+	nest1_1 -> N13 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N12 -> S1 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#DCE775" penwidth=1.5 style=solid label="administers databases" dir=forward]
+	N0 -> M0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_212.txt b/test/diagrams/graph_hard/diagrams_212.txt
new file mode 100644
index 0000000000000000000000000000000000000000..966856f1ce9c3603936ed0c8fa7f55765d8f32da
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_212.txt
@@ -0,0 +1,29 @@
+<Access Control Systems, connectedTo, Proxy Server Configuration>
+<Access Control Systems, connectedTo, Server Deployment>
+<Access Control Systems, connectedTo, Storage Solutions>
+<Access Control Systems, secures systems, Patch Management>
+<Antivirus and Endpoint Protection, connectedTo, Network Security>
+<Antivirus and Endpoint Protection, connectedTo, Proxy Server Configuration>
+<Automation Scripting, connectedTo, Rack and Cabinet Management>
+<Automation Scripting, deploys VDIs, Cabling and Wiring>
+<Backup and Recovery Systems, connectedTo, Cloud Integration with On_premise>
+<Backup and Recovery Systems, connectedTo, Proxy Server Configuration>
+<Cabling and Wiring, connectedTo, Firewall Management>
+<Capacity Planning, connectedTo, Storage Solutions>
+<Cloud Integration with On_premise, connectedTo, Network Design>
+<DNS Management, connectedTo, Access Control Systems>
+<Data Center Management, connectedTo, Capacity Planning>
+<Directory Services, connectedTo, Disaster Recovery Planning>
+<Disaster Recovery Planning, connectedTo, DNS Management>
+<Firewall Management, connectedTo, Automation Scripting>
+<Group Policy Management, connectedTo, Data Center Management>
+<Network Design, connectedTo, Group Policy Management>
+<Network Security, connectedTo, DNS Management>
+<Patch Management, connectedTo, Backup and Recovery Systems>
+<Patch Management, connectedTo, Proxy Server Configuration>
+<Proxy Server Configuration, administers databases, Virtual Desktop Infrastructure>
+<Proxy Server Configuration, connectedTo, Automation Scripting>
+<Proxy Server Configuration, connectedTo, Rack and Cabinet Management>
+<Rack and Cabinet Management, connectedTo, Virtual Desktop Infrastructure>
+<Server Deployment, connectedTo, Directory Services>
+<Storage Solutions, connectedTo, Proxy Server Configuration>
diff --git a/test/diagrams/graph_hard/diagrams_213.txt b/test/diagrams/graph_hard/diagrams_213.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ccd9cfc40eb922890a376da2c93e4643f6039656
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_213.txt
@@ -0,0 +1,35 @@
+<Access Control Systems, connectedTo, Monitoring and Alerting>
+<Cabling and Wiring, connectedTo, Remote Access Solutions>
+<Capacity Planning, connectedTo, Virtualization>
+<Capacity Planning, deploys servers, Software Licensing Management>
+<DNS Management, connectedTo, Cabling and Wiring>
+<DNS Management, connectedTo, Environmental Monitoring>
+<DNS Management, connectedTo, Operating System Installation>
+<DNS Management, connectedTo, Remote Access Solutions>
+<Database Administration, connectedTo, Remote Access Solutions>
+<Directory Services, connectedTo, VPN Configuration>
+<Directory Services, optimizes environments, Hardware Procurement>
+<Environmental Monitoring, connectedTo, Operating System Installation>
+<Environmental Monitoring, connectedTo, Patch Management>
+<Group Policy Management, connectedTo, IT Asset Management>
+<Group Policy Management, connectedTo, Storage Solutions>
+<Hardware Procurement, connectedTo, Power and Cooling Management>
+<IT Asset Management, connectedTo, Cabling and Wiring>
+<IT Asset Management, connectedTo, Directory Services>
+<IT Asset Management, connectedTo, Remote Access Solutions>
+<IT Asset Management, connectedTo, VPN Configuration>
+<Mail Server Management, connectedTo, Operating System Installation>
+<Mail Server Management, connectedTo, Troubleshooting and Support>
+<Monitoring and Alerting, connectedTo, Proxy Server Configuration>
+<Monitoring and Alerting, connectedTo, VPN Configuration>
+<Network Performance Tuning, connectedTo, Capacity Planning>
+<Network Performance Tuning, connectedTo, Virtualization>
+<Operating System Installation, connectedTo, Access Control Systems>
+<Patch Management, connectedTo, Mail Server Management>
+<Power and Cooling Management, connectedTo, Directory Services>
+<Proxy Server Configuration, connectedTo, Group Policy Management>
+<Remote Access Solutions, connectedTo, Directory Services>
+<Software Licensing Management, connectedTo, Virtualization>
+<Storage Solutions, connectedTo, Database Administration>
+<Troubleshooting and Support, connectedTo, Operating System Installation>
+<Virtualization, connectedTo, DNS Management>
diff --git a/test/diagrams/graph_hard/diagrams_214.dot b/test/diagrams/graph_hard/diagrams_214.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8766a6cf72b5805e46e851234e2efd0acb1fea76
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_214.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=RL
+	N0 [label="Pipeline Automation" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N1 [label="Chaos Engineering" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N2 [label="Feature Flags" color="#66BB6A" fillcolor="#E8F5E9" shape=predefinedprocess style=filled]
+	N3 [label="Security in DevOps" color="#66BB6A" fillcolor="#E8F5E9" shape=rect style=filled]
+	N4 [label="Continuous Delivery" color="#66BB6A" fillcolor="#E8F5E9" shape=parallelogram style=filled]
+	N5 [label="Automated Testing" color="#A1D7CD" fillcolor="#EDF5F3" shape=inputoutput style=filled]
+	N6 [label="Serverless Deployment" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N7 [label="Code Quality Checks" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N8 [label="Dynamic Application Security Testing" color="#FF9800" fillcolor="#FFE0B2" shape=vnode_shape style=filled]
+	N9 [label="Collaboration Tools" color="#FF9800" fillcolor="#FFE0B2" shape=rect style=filled]
+	N10 [label="Rollback Strategies" color="#66BB6A" fillcolor="#E8F5E9" shape=diamond style=filled]
+	N11 [label="Infrastructure as Code" color="#FF9800" fillcolor="#FFE0B2" shape=action style=filled]
+	N12 [label="Immutable Infrastructure" color="#FF9800" fillcolor="#FFE0B2" shape=document style=filled]
+	N13 [label="Cloud Native Development" color="#A1D7CD" fillcolor="#EDF5F3" shape=vnode_shape style=filled]
+	S0 [label="" color="#66BB6A" fillcolor="#E8F5E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FF9800" fillcolor="#FFE0B2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#66BB6A" fillcolor="#E8F5E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#66BB6A" fillcolor="#E8F5E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Container Orchestration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Container Orchestration"
+		nest0_0 [label="ChatOps" color="#A1D7CD" fillcolor="#EDF5F3" shape=rectangle style=filled]
+		nest0_1 [label="Automated Deployment" color="#FF9800" fillcolor="#FFE0B2" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Continuous Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Continuous Integration"
+		nest1_0 [label="Observability Implementation" color="#A1D7CD" fillcolor="#EDF5F3" shape=action style=filled]
+		nest1_1 [label="Monitoring and Logging" color="#FF9800" fillcolor="#FFE0B2" shape=vnode_shape style=filled]
+		nest1_2 [label="Release Management" color="#66BB6A" fillcolor="#E8F5E9" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest0_0 [color="#66BB6A" penwidth=1.5 style=solid label="implements SRE" dir=forward]
+	nest0_1 -> N4 [color="#A1D7CD" penwidth=1.5 style=solid label="monitors applications" dir=forward]
+	nest1_0 -> nest1_1 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#66BB6A" penwidth=1.5 style=solid label="uses serverless" dir=forward]
+	N11 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> S1 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> M0 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M0 [color="#A1D7CD" penwidth=1.5 style=dashed label="automates pipelines" dir=forward]
+	N11 -> M0 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N13 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	M1 -> N9 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_214.txt b/test/diagrams/graph_hard/diagrams_214.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2658719cbd26e152498fee8776bf8d17281f9cd4
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_214.txt
@@ -0,0 +1,34 @@
+<Automated Deployment, monitors applications, Continuous Delivery>
+<Automated Testing, connectedTo, Serverless Deployment>
+<Chaos Engineering, connectedTo, Collaboration Tools>
+<Chaos Engineering, connectedTo, Feature Flags>
+<Chaos Engineering, connectedTo, Infrastructure as Code>
+<Chaos Engineering, connectedTo, Security in DevOps>
+<Chaos Engineering, connectedTo, Serverless Deployment>
+<ChatOps, connectedTo, Automated Deployment>
+<Code Quality Checks, connectedTo, Collaboration Tools>
+<Code Quality Checks, connectedTo, Dynamic Application Security Testing>
+<Collaboration Tools, connectedTo, Cloud Native Development>
+<Collaboration Tools, connectedTo, Rollback Strategies>
+<Continuous Delivery, connectedTo, Automated Testing>
+<Dynamic Application Security Testing, automates pipelines, Cloud Native Development>
+<Dynamic Application Security Testing, connectedTo, Cloud Native Development>
+<Dynamic Application Security Testing, connectedTo, Collaboration Tools>
+<Dynamic Application Security Testing, connectedTo, Immutable Infrastructure>
+<Dynamic Application Security Testing, connectedTo, Infrastructure as Code>
+<Dynamic Application Security Testing, connectedTo, Rollback Strategies>
+<Dynamic Application Security Testing, implements SRE, ChatOps>
+<Feature Flags, connectedTo, Security in DevOps>
+<Immutable Infrastructure, connectedTo, Cloud Native Development>
+<Infrastructure as Code, connectedTo, Cloud Native Development>
+<Infrastructure as Code, connectedTo, Immutable Infrastructure>
+<Infrastructure as Code, connectedTo, Observability Implementation>
+<Monitoring and Logging, uses serverless, Release Management>
+<Observability Implementation, connectedTo, Monitoring and Logging>
+<Pipeline Automation, connectedTo, Chaos Engineering>
+<Release Management, connectedTo, Immutable Infrastructure>
+<Rollback Strategies, connectedTo, Infrastructure as Code>
+<Security in DevOps, connectedTo, Collaboration Tools>
+<Security in DevOps, connectedTo, Continuous Delivery>
+<Serverless Deployment, connectedTo, Cloud Native Development>
+<Serverless Deployment, connectedTo, Code Quality Checks>
diff --git a/test/diagrams/graph_hard/diagrams_215.dot b/test/diagrams/graph_hard/diagrams_215.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7d5d22540fd2900a94da29fc1d9919d68af02b85
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_215.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=BT
+	N0 [label="GitOps" color="#DCE775" fillcolor="#FCFCE7" shape=document style=filled]
+	N1 [label="Automated Deployment" color="#DCE775" fillcolor="#FCFCE7" shape=rectangle style=filled]
+	N2 [label="Continuous Delivery" color="#DCE775" fillcolor="#FCFCE7" shape=multipledocuments style=filled]
+	N3 [label="Canary Releases" color="#FFF8A6" fillcolor="#FFFDE0" shape=rectangle style=filled]
+	N4 [label="Release Management" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+	N5 [label="Infrastructure as Code" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+	N6 [label="Code Quality Checks" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N7 [label="Rollback Strategies" color="#FFF8A6" fillcolor="#FFFDE0" shape=action style=filled]
+	N8 [label="Dynamic Application Security Testing" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+	N9 [label="Observability Implementation" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N10 [label="Immutable Infrastructure" color="#73C6BC" fillcolor="#D0EFEE" shape=vnode_shape style=filled]
+	N11 [label="Cloud Native Development" color="#73C6BC" fillcolor="#D0EFEE" shape=rectangle style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#DCE775" fillcolor="#FCFCE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Serverless Deployment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Serverless Deployment"
+		nest0_0 [label="Alerting and Incident Response" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+		nest0_1 [label="Infrastructure Provisioning" color="#73C6BC" fillcolor="#D0EFEE" shape=inputoutput style=filled]
+		nest0_2 [label="Containerization" color="#73C6BC" fillcolor="#D0EFEE" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Pipeline Automation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Pipeline Automation"
+		nest1_0 [label="Environment Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=preparation style=filled]
+		nest1_1 [label="Security in DevOps" color="#73C6BC" fillcolor="#D0EFEE" shape=rect style=filled]
+		nest1_2 [label="Site Reliability Engineering Principles" color="#FFF8A6" fillcolor="#FFFDE0" shape=action style=filled]
+	}
+	N0 -> N1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFF8A6" penwidth=1.5 style=dashed label="manages immutable infrastructure" dir=forward]
+	N5 -> N6 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#73C6BC" penwidth=1.5 style=solid label="sends alerts" dir=forward]
+	N7 -> N8 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#DCE775" penwidth=1.5 style=dashed label="secures secrets" dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed label="performs static analysis" dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N4 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N5 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N3 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S2 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N4 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N7 -> M0 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N9 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_215.txt b/test/diagrams/graph_hard/diagrams_215.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cd07f171af00c300bb4bdceda1ab1de991e7fd06
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_215.txt
@@ -0,0 +1,31 @@
+<Alerting and Incident Response, connectedTo, Infrastructure Provisioning>
+<Automated Deployment, connectedTo, Continuous Delivery>
+<Automated Deployment, connectedTo, Dynamic Application Security Testing>
+<Canary Releases, connectedTo, Dynamic Application Security Testing>
+<Canary Releases, connectedTo, Observability Implementation>
+<Canary Releases, connectedTo, Release Management>
+<Code Quality Checks, sends alerts, Rollback Strategies>
+<Containerization, connectedTo, Release Management>
+<Continuous Delivery, connectedTo, Canary Releases>
+<Continuous Delivery, connectedTo, Code Quality Checks>
+<Continuous Delivery, connectedTo, Observability Implementation>
+<Continuous Delivery, connectedTo, Release Management>
+<Dynamic Application Security Testing, connectedTo, Cloud Native Development>
+<Dynamic Application Security Testing, connectedTo, Immutable Infrastructure>
+<Dynamic Application Security Testing, connectedTo, Observability Implementation>
+<Environment Management, connectedTo, Security in DevOps>
+<GitOps, connectedTo, Automated Deployment>
+<GitOps, connectedTo, Canary Releases>
+<GitOps, connectedTo, Infrastructure as Code>
+<GitOps, connectedTo, Release Management>
+<Immutable Infrastructure, performs static analysis, Cloud Native Development>
+<Infrastructure Provisioning, connectedTo, Containerization>
+<Infrastructure as Code, connectedTo, Code Quality Checks>
+<Observability Implementation, connectedTo, Alerting and Incident Response>
+<Observability Implementation, connectedTo, Environment Management>
+<Observability Implementation, secures secrets, Immutable Infrastructure>
+<Release Management, manages immutable infrastructure, Infrastructure as Code>
+<Rollback Strategies, connectedTo, Dynamic Application Security Testing>
+<Rollback Strategies, connectedTo, Observability Implementation>
+<Security in DevOps, connectedTo, Site Reliability Engineering Principles>
+<Site Reliability Engineering Principles, connectedTo, Infrastructure as Code>
diff --git a/test/diagrams/graph_hard/diagrams_216.txt b/test/diagrams/graph_hard/diagrams_216.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9d9d2d73fee3427d9a79620cdda4c1f4e5065642
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_216.txt
@@ -0,0 +1,27 @@
+<Automated Rollbacks, connectedTo, Infrastructure Provisioning>
+<Automated Testing, connectedTo, Monitoring and Logging>
+<Chaos Engineering, connectedTo, Automated Rollbacks>
+<Chaos Engineering, connectedTo, GitOps>
+<Chaos Engineering, connectedTo, Infrastructure Provisioning>
+<Container Orchestration, connectedTo, Dynamic Application Security Testing>
+<Container Orchestration, connectedTo, Environment Management>
+<Container Orchestration, connectedTo, Rollback Strategies>
+<Continuous Delivery, connectedTo, Automated Rollbacks>
+<Continuous Delivery, connectedTo, Rollback Strategies>
+<Continuous Delivery, fosters cross_functional teams, Container Orchestration>
+<Cross_Functional Team Collaboration, connectedTo, Rollback Strategies>
+<Dynamic Application Security Testing, connectedTo, Immutable Infrastructure>
+<Environment Management, connectedTo, Feedback Loops>
+<Feedback Loops, connectedTo, Infrastructure as Code>
+<Immutable Infrastructure, connectedTo, Post_Mortem Analysis>
+<Immutable Infrastructure, connectedTo, Rollback Strategies>
+<Infrastructure Provisioning, connectedTo, GitOps>
+<Infrastructure as Code, connectedTo, Cross_Functional Team Collaboration>
+<Monitoring and Logging, connectedTo, Security in DevOps>
+<Pipeline Automation, connectedTo, Post_Mortem Analysis>
+<Post_Mortem Analysis, connectedTo, Automated Rollbacks>
+<Post_Mortem Analysis, connectedTo, Automated Testing>
+<Post_Mortem Analysis, connectedTo, Rollback Strategies>
+<Rollback Strategies, connectedTo, Automated Rollbacks>
+<Rollback Strategies, connectedTo, Chaos Engineering>
+<Security in DevOps, connectedTo, Pipeline Automation>
diff --git a/test/diagrams/graph_hard/diagrams_217.dot b/test/diagrams/graph_hard/diagrams_217.dot
new file mode 100644
index 0000000000000000000000000000000000000000..27b52dbe79205dd8382cc08569d4ade681ff04ce
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_217.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=LR
+	N0 [label="Unit Testing" color="#FF8A65" fillcolor="#FBE9E7" shape=rectangle style=filled]
+	N1 [label="Database Design" color="#4CAF50" fillcolor="#C8E6C9" shape=vnode_shape style=filled]
+	N2 [label="Scalability Design" color="#4CAF50" fillcolor="#C8E6C9" shape=predefinedprocess style=filled]
+	N3 [label="Web Application Development" color="#4CAF50" fillcolor="#C8E6C9" shape=multipledocuments style=filled]
+	N4 [label="User Interface Design" color="#7986CB" fillcolor="#E8EAF6" shape=vnode_shape style=filled]
+	N5 [label="API Development" color="#7986CB" fillcolor="#E8EAF6" shape=document style=filled]
+	N6 [label="User Experience Design" color="#7986CB" fillcolor="#E8EAF6" shape=rectangle style=filled]
+	N7 [label="Requirements Gathering" color="#FF8A65" fillcolor="#FBE9E7" shape=diamond style=filled]
+	N8 [label="Version Control" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N9 [label="Agile Methodologies" color="#7986CB" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	N10 [label="Continuous Integration" color="#4CAF50" fillcolor="#C8E6C9" shape=multipledocuments style=filled]
+	N11 [label="Technical Debt Management" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N12 [label="Mobile Application Development" color="#FF8A65" fillcolor="#FBE9E7" shape=document style=filled]
+	N13 [label="Architecture Planning" color="#FF8A65" fillcolor="#FBE9E7" shape=vnode_shape style=filled]
+	N14 [label="Backend Development" color="#4CAF50" fillcolor="#C8E6C9" shape=multipledocuments style=filled]
+	S0 [label="" color="#FF8A65" fillcolor="#FBE9E7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FF8A65" fillcolor="#FBE9E7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Game Development {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Game Development"
+		nest0_0 [label="Testing Frameworks" color="#4CAF50" fillcolor="#C8E6C9" shape=action style=filled]
+		nest0_1 [label="Embedded Systems Development" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+		nest0_2 [label="Cloud_Native Development" color="#FF8A65" fillcolor="#FBE9E7" shape=rectangle style=filled]
+	}
+	subgraph cluster_Continuous Delivery {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Continuous Delivery"
+		nest1_0 [label="Frontend Development" color="#FF8A65" fillcolor="#FBE9E7" shape=vnode_shape style=filled]
+		nest1_1 [label="Compiler Design" color="#4CAF50" fillcolor="#C8E6C9" shape=action style=filled]
+		nest1_2 [label="Coding" color="#7986CB" fillcolor="#E8EAF6" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#4CAF50" penwidth=1.5 style=solid label="ensures scalability" dir=forward]
+	N4 -> N5 [color="#7986CB" penwidth=1.5 style=dashed label="implements CI" dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed label="manages technical debt" dir=forward]
+	N10 -> N11 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N14 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest1_0 [color="#7986CB" penwidth=1.5 style=dashed label="implements security" dir=forward]
+	nest1_2 -> N3 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N10 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N3 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_217.txt b/test/diagrams/graph_hard/diagrams_217.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1f98c915a787166b435c56fb37c6c8c06d8b53ed
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_217.txt
@@ -0,0 +1,28 @@
+<API Development, connectedTo, User Experience Design>
+<Agile Methodologies, manages technical debt, Continuous Integration>
+<Architecture Planning, connectedTo, Backend Development>
+<Cloud_Native Development, connectedTo, Backend Development>
+<Coding, connectedTo, Web Application Development>
+<Compiler Design, connectedTo, Coding>
+<Continuous Integration, connectedTo, Architecture Planning>
+<Continuous Integration, connectedTo, Backend Development>
+<Continuous Integration, connectedTo, Technical Debt Management>
+<Database Design, connectedTo, Scalability Design>
+<Database Design, connectedTo, Web Application Development>
+<Embedded Systems Development, connectedTo, Cloud_Native Development>
+<Frontend Development, connectedTo, Compiler Design>
+<Mobile Application Development, connectedTo, Architecture Planning>
+<Requirements Gathering, connectedTo, Version Control>
+<Scalability Design, connectedTo, Architecture Planning>
+<Scalability Design, connectedTo, Version Control>
+<Scalability Design, connectedTo, Web Application Development>
+<Technical Debt Management, connectedTo, Mobile Application Development>
+<Testing Frameworks, connectedTo, Embedded Systems Development>
+<Unit Testing, connectedTo, Database Design>
+<Unit Testing, connectedTo, Web Application Development>
+<User Experience Design, connectedTo, Requirements Gathering>
+<User Experience Design, implements security, Frontend Development>
+<User Interface Design, implements CI, API Development>
+<Version Control, connectedTo, Agile Methodologies>
+<Web Application Development, connectedTo, Testing Frameworks>
+<Web Application Development, ensures scalability, User Interface Design>
diff --git a/test/diagrams/graph_hard/diagrams_218.dot b/test/diagrams/graph_hard/diagrams_218.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1fbf2c9c8c30517414989287901856fab378e577
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_218.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=LR
+	N0 [label="Agile Methodologies" color="#61CAC3" fillcolor="#C2E8E6" shape=preparation style=filled]
+	N1 [label="Frontend Development" color="#4DB6AC" fillcolor="#E0F2F1" shape=vnode_shape style=filled]
+	N2 [label="Coding" color="#80DDEA" fillcolor="#D3F7F9" shape=diamond style=filled]
+	N3 [label="Security Hardening" color="#80DDEA" fillcolor="#D3F7F9" shape=action style=filled]
+	N4 [label="Integration Testing" color="#80DDEA" fillcolor="#D3F7F9" shape=predefinedprocess style=filled]
+	N5 [label="Microservices Architecture" color="#61CAC3" fillcolor="#C2E8E6" shape=rect style=filled]
+	N6 [label="Code Review" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N7 [label="Game Development" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N8 [label="Version Control" color="#61CAC3" fillcolor="#C2E8E6" shape=parallelogram style=filled]
+	N9 [label="Maintenance" color="#80DDEA" fillcolor="#D3F7F9" shape=parallelogram style=filled]
+	N10 [label="Bug Fixing" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N11 [label="Data Structures Implementation" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N12 [label="Deployment" color="#80DDEA" fillcolor="#D3F7F9" shape=multipledocuments style=filled]
+	N13 [label="Scalability Design" color="#80DDEA" fillcolor="#D3F7F9" shape=document style=filled]
+	N14 [label="Operating System Development" color="#80DDEA" fillcolor="#D3F7F9" shape=rectangle style=filled]
+	N15 [label="Database Design" color="#80DDEA" fillcolor="#D3F7F9" shape=rectangle style=filled]
+	N16 [label="Containerization" color="#80DDEA" fillcolor="#D3F7F9" shape=vnode_shape style=filled]
+	S0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4DB6AC" fillcolor="#E0F2F1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#61CAC3" fillcolor="#C2E8E6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#61CAC3" fillcolor="#C2E8E6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_User Experience Design {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="User Experience Design"
+		nest0_0 [label="Algorithm Design" color="#4DB6AC" fillcolor="#E0F2F1" shape=rect style=filled]
+		nest0_1 [label="Technical Debt Management" color="#61CAC3" fillcolor="#C2E8E6" shape=database style=filled]
+	}
+	subgraph cluster_Continuous Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Continuous Integration"
+		nest1_0 [label="Web Application Development" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+		nest1_1 [label="Cloud_Native Development" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+		nest1_2 [label="System Design" color="#80DDEA" fillcolor="#D3F7F9" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#4DB6AC" penwidth=1.5 style=dashed label="optimizes performance" dir=forward]
+	N2 -> N3 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid label="designs APIs" dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#80DDEA" penwidth=1.5 style=solid label="builds backends" dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N12 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> nest1_0 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N7 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N10 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N16 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#4DB6AC" penwidth=1.5 style=dashed label="fixes bugs" dir=forward]
+	S1 -> N8 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=dashed label="integrates modules" dir=forward]
+	N3 -> M0 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#4DB6AC" penwidth=1.5 style=dashed label="ensures scalability" dir=forward]
+	M0 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#61CAC3" penwidth=1.5 style=dashed label="builds desktop apps" dir=forward]
+	M1 -> N8 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_218.txt b/test/diagrams/graph_hard/diagrams_218.txt
new file mode 100644
index 0000000000000000000000000000000000000000..781b0fdea2269890c3d64dcaadbddfaa93593c8a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_218.txt
@@ -0,0 +1,37 @@
+<Agile Methodologies, builds desktop apps, Version Control>
+<Agile Methodologies, connectedTo, Code Review>
+<Agile Methodologies, connectedTo, Frontend Development>
+<Algorithm Design, connectedTo, Technical Debt Management>
+<Bug Fixing, connectedTo, Containerization>
+<Bug Fixing, connectedTo, Data Structures Implementation>
+<Bug Fixing, connectedTo, Database Design>
+<Bug Fixing, connectedTo, Deployment>
+<Bug Fixing, connectedTo, Operating System Development>
+<Cloud_Native Development, connectedTo, System Design>
+<Code Review, connectedTo, Game Development>
+<Coding, connectedTo, Security Hardening>
+<Coding, integrates modules, Code Review>
+<Data Structures Implementation, connectedTo, Deployment>
+<Data Structures Implementation, connectedTo, Web Application Development>
+<Database Design, connectedTo, Containerization>
+<Deployment, builds backends, Scalability Design>
+<Frontend Development, ensures scalability, Code Review>
+<Frontend Development, optimizes performance, Coding>
+<Game Development, connectedTo, Version Control>
+<Integration Testing, connectedTo, Version Control>
+<Integration Testing, designs APIs, Microservices Architecture>
+<Maintenance, connectedTo, Bug Fixing>
+<Microservices Architecture, connectedTo, Algorithm Design>
+<Microservices Architecture, connectedTo, Code Review>
+<Microservices Architecture, connectedTo, Database Design>
+<Microservices Architecture, connectedTo, Scalability Design>
+<Microservices Architecture, connectedTo, Version Control>
+<Microservices Architecture, fixes bugs, Maintenance>
+<Operating System Development, connectedTo, Database Design>
+<Scalability Design, connectedTo, Operating System Development>
+<Security Hardening, connectedTo, Code Review>
+<Security Hardening, connectedTo, Integration Testing>
+<System Design, connectedTo, Game Development>
+<Technical Debt Management, connectedTo, Deployment>
+<Version Control, connectedTo, Maintenance>
+<Web Application Development, connectedTo, Cloud_Native Development>
diff --git a/test/diagrams/graph_hard/diagrams_219.dot b/test/diagrams/graph_hard/diagrams_219.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c890b18ebe3910aba877056c5157a4a3bbd02002
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_219.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=BT
+	N0 [label="Compiler Design" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N1 [label="Bug Fixing" color="#FFC085" fillcolor="#FFDAB9" shape=hexagon style=filled]
+	N2 [label="Backend Development" color="#64B5F6" fillcolor="#E3F2FD" shape=preparation style=filled]
+	N3 [label="Security Hardening" color="#64B5F6" fillcolor="#E3F2FD" shape=preparation style=filled]
+	N4 [label="Testing Frameworks" color="#FFC085" fillcolor="#FFDAB9" shape=action style=filled]
+	N5 [label="Performance Optimization" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N6 [label="API Development" color="#64B5F6" fillcolor="#E3F2FD" shape=multipledocuments style=filled]
+	N7 [label="Integration Testing" color="#64B5F6" fillcolor="#E3F2FD" shape=rectangle style=filled]
+	N8 [label="Version Control" color="#42A5F5" fillcolor="#F1F8FF" shape=preparation style=filled]
+	N9 [label="Data Structures Implementation" color="#42A5F5" fillcolor="#F1F8FF" shape=rectangle style=filled]
+	N10 [label="Technical Debt Management" color="#42A5F5" fillcolor="#F1F8FF" shape=multipledocuments style=filled]
+	N11 [label="Containerization" color="#FFC085" fillcolor="#FFDAB9" shape=predefinedprocess style=filled]
+	N12 [label="Maintenance" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+	N13 [label="Algorithm Design" color="#42A5F5" fillcolor="#F1F8FF" shape=preparation style=filled]
+	N14 [label="Scalability Design" color="#42A5F5" fillcolor="#F1F8FF" shape=multipledocuments style=filled]
+	N15 [label="Operating System Development" color="#FFC085" fillcolor="#FFDAB9" shape=rectangle style=filled]
+	N16 [label="Coding" color="#64B5F6" fillcolor="#E3F2FD" shape=preparation style=filled]
+	S0 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#42A5F5" fillcolor="#F1F8FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Frontend Development {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Frontend Development"
+		nest0_0 [label="Desktop Application Development" color="#42A5F5" fillcolor="#F1F8FF" shape=preparation style=filled]
+		nest0_1 [label="Cloud_Native Development" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+		nest0_2 [label="Game Development" color="#64B5F6" fillcolor="#E3F2FD" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Microservices Architecture {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Microservices Architecture"
+		nest1_0 [label="Continuous Integration" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+		nest1_1 [label="Deployment" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest1_2 [label="Refactoring" color="#FFC085" fillcolor="#FFDAB9" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#42A5F5" penwidth=1.5 style=dashed label="optimizes performance" dir=forward]
+	N7 -> N8 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#42A5F5" penwidth=1.5 style=solid label="conducts code reviews" dir=forward]
+	N14 -> N15 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N14 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#42A5F5" penwidth=1.5 style=solid label="implements security" dir=forward]
+	nest1_1 -> nest1_2 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed label="builds microservices" dir=forward]
+	nest1_2 -> N5 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=solid label="performs refactoring" dir=forward]
+	N4 -> S1 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#64B5F6" penwidth=1.5 style=solid label="uses frameworks" dir=forward]
+	S1 -> N8 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=solid label="integrates modules" dir=forward]
+	M0 -> N8 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	M1 -> N5 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_219.txt b/test/diagrams/graph_hard/diagrams_219.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bef9f98b47f5ba1d872a7c079a9ac1f0f961fab0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_219.txt
@@ -0,0 +1,35 @@
+<API Development, optimizes performance, Integration Testing>
+<Algorithm Design, conducts code reviews, Scalability Design>
+<Algorithm Design, connectedTo, Desktop Application Development>
+<Backend Development, connectedTo, Security Hardening>
+<Backend Development, connectedTo, Version Control>
+<Bug Fixing, connectedTo, Backend Development>
+<Bug Fixing, connectedTo, Performance Optimization>
+<Bug Fixing, connectedTo, Version Control>
+<Cloud_Native Development, connectedTo, Game Development>
+<Compiler Design, connectedTo, Bug Fixing>
+<Compiler Design, connectedTo, Performance Optimization>
+<Containerization, connectedTo, Maintenance>
+<Continuous Integration, implements security, Deployment>
+<Data Structures Implementation, connectedTo, Technical Debt Management>
+<Deployment, connectedTo, Refactoring>
+<Desktop Application Development, connectedTo, Cloud_Native Development>
+<Game Development, connectedTo, Scalability Design>
+<Integration Testing, builds microservices, Continuous Integration>
+<Integration Testing, connectedTo, Version Control>
+<Maintenance, connectedTo, Algorithm Design>
+<Operating System Development, connectedTo, Coding>
+<Performance Optimization, connectedTo, API Development>
+<Refactoring, connectedTo, Performance Optimization>
+<Scalability Design, connectedTo, Operating System Development>
+<Security Hardening, connectedTo, Algorithm Design>
+<Security Hardening, connectedTo, Technical Debt Management>
+<Security Hardening, connectedTo, Testing Frameworks>
+<Security Hardening, integrates modules, Version Control>
+<Security Hardening, performs refactoring, Version Control>
+<Technical Debt Management, connectedTo, Containerization>
+<Testing Frameworks, connectedTo, Containerization>
+<Testing Frameworks, connectedTo, Performance Optimization>
+<Testing Frameworks, connectedTo, Version Control>
+<Testing Frameworks, uses frameworks, Data Structures Implementation>
+<Version Control, connectedTo, Data Structures Implementation>
diff --git a/test/diagrams/graph_hard/diagrams_22.dot b/test/diagrams/graph_hard/diagrams_22.dot
new file mode 100644
index 0000000000000000000000000000000000000000..88fb8adc14f46b218896d5152d28ea6eb99f6554
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_22.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=RL
+	N0 [label="Pro Bono Work" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N1 [label="Legal Consultation" color="#90A4AE" fillcolor="#ECEFF1" shape=document style=filled]
+	N2 [label="Bankruptcy Filing" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N3 [label="Sentencing" color="#81C784" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+	N4 [label="Divorce Proceedings" color="#90A4AE" fillcolor="#ECEFF1" shape=vnode_shape style=filled]
+	N5 [label="Legal Research" color="#81C784" fillcolor="#F1F8E9" shape=preparation style=filled]
+	N6 [label="Pre_Trial Hearing" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N7 [label="Bail Hearing" color="#A188D0" fillcolor="#DACBE3" shape=action style=filled]
+	N8 [label="Judgment Writing" color="#81C784" fillcolor="#F1F8E9" shape=rect style=filled]
+	N9 [label="Enforcement" color="#90A4AE" fillcolor="#ECEFF1" shape=action style=filled]
+	N10 [label="Cross_Examination" color="#81C784" fillcolor="#F1F8E9" shape=action style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#81C784" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Case Filing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Case Filing"
+		nest0_0 [label="Court Order Execution" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+		nest0_1 [label="Estate Planning" color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+		nest0_2 [label="Patent Application" color="#A188D0" fillcolor="#DACBE3" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Amicus Brief Submission {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Amicus Brief Submission"
+		nest1_0 [label="Copyright Infringement" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+		nest1_1 [label="Plea Bargain" color="#A188D0" fillcolor="#DACBE3" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed label="litigates" dir=forward]
+	nest0_1 -> nest0_2 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest0_0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N10 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	M0 -> N8 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N8 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	M2 -> N10 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_220.dot b/test/diagrams/graph_hard/diagrams_220.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fe14dcc660b453407e2c0fa23284f2839f287e3c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_220.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=RL
+	N0 [label="Troubleshooting and Debugging" color="#BCB88A" fillcolor="#F5F5DC" shape=document style=filled]
+	N1 [label="Power Integrity Analysis" color="#BCB88A" fillcolor="#F5F5DC" shape=rect style=filled]
+	N2 [label="Intellectual Property Protection" color="#F06292" fillcolor="#FCE4EC" shape=preparation style=filled]
+	N3 [label="FPGA Design" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N4 [label="Electromagnetic Compatibility Testing" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N5 [label="Component Selection" color="#F06292" fillcolor="#FCE4EC" shape=rectangle style=filled]
+	N6 [label="Prototyping" color="#F06292" fillcolor="#FCE4EC" shape=rect style=filled]
+	N7 [label="RF Circuit Design" color="#FFB2A5" fillcolor="#FFDCD6" shape=document style=filled]
+	N8 [label="Microcontroller Programming" color="#BCB88A" fillcolor="#F5F5DC" shape=inputoutput style=filled]
+	N9 [label="Mixed_Signal Design" color="#BCB88A" fillcolor="#F5F5DC" shape=inputoutput style=filled]
+	N10 [label="Failure Analysis" color="#BCB88A" fillcolor="#F5F5DC" shape=vnode_shape style=filled]
+	N11 [label="Supply Chain Management for Components" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N12 [label="Actuator Control" color="#FFB2A5" fillcolor="#FFDCD6" shape=action style=filled]
+	N13 [label="Assembly Line Optimization" color="#FFB2A5" fillcolor="#FFDCD6" shape=database style=filled]
+	N14 [label="Regulatory Compliance" color="#F06292" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	S2 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Low_Power Design {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Low_Power Design"
+		nest0_0 [label="Reverse Engineering" color="#FFB2A5" fillcolor="#FFDCD6" shape=rect style=filled]
+		nest0_1 [label="Material Selection" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	}
+	subgraph cluster_Manufacturing Process Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Manufacturing Process Planning"
+		nest1_0 [label="Power Management Design" color="#FFB2A5" fillcolor="#FFDCD6" shape=predefinedprocess style=filled]
+		nest1_1 [label="Testing and Validation" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+		nest1_2 [label="ASIC Design" color="#FFB2A5" fillcolor="#FFDCD6" shape=multipledocuments style=filled]
+		nest1_3 [label="Cost Optimization" color="#FFB2A5" fillcolor="#FFDCD6" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> nest0_0 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N10 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S2 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N7 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S2 -> N14 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	M0 -> N3 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N5 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_220.txt b/test/diagrams/graph_hard/diagrams_220.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cf93045fc5e61aa44c93d4d5e3f03b43784c9c10
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_220.txt
@@ -0,0 +1,32 @@
+<ASIC Design, connectedTo, Cost Optimization>
+<Actuator Control, connectedTo, Assembly Line Optimization>
+<Assembly Line Optimization, connectedTo, Regulatory Compliance>
+<Component Selection, connectedTo, Prototyping>
+<Cost Optimization, connectedTo, Mixed_Signal Design>
+<Electromagnetic Compatibility Testing, connectedTo, Component Selection>
+<Electromagnetic Compatibility Testing, connectedTo, Power Management Design>
+<FPGA Design, connectedTo, Actuator Control>
+<FPGA Design, connectedTo, Component Selection>
+<FPGA Design, connectedTo, Electromagnetic Compatibility Testing>
+<FPGA Design, connectedTo, Mixed_Signal Design>
+<FPGA Design, connectedTo, RF Circuit Design>
+<FPGA Design, connectedTo, Regulatory Compliance>
+<Failure Analysis, connectedTo, Supply Chain Management for Components>
+<Intellectual Property Protection, connectedTo, Component Selection>
+<Intellectual Property Protection, connectedTo, FPGA Design>
+<Material Selection, connectedTo, Failure Analysis>
+<Microcontroller Programming, connectedTo, Mixed_Signal Design>
+<Mixed_Signal Design, connectedTo, Failure Analysis>
+<Power Integrity Analysis, connectedTo, Component Selection>
+<Power Integrity Analysis, connectedTo, FPGA Design>
+<Power Integrity Analysis, connectedTo, Intellectual Property Protection>
+<Power Management Design, connectedTo, Testing and Validation>
+<Prototyping, connectedTo, RF Circuit Design>
+<RF Circuit Design, connectedTo, Microcontroller Programming>
+<Reverse Engineering, connectedTo, Material Selection>
+<Supply Chain Management for Components, connectedTo, Actuator Control>
+<Supply Chain Management for Components, connectedTo, Reverse Engineering>
+<Testing and Validation, connectedTo, ASIC Design>
+<Troubleshooting and Debugging, connectedTo, Component Selection>
+<Troubleshooting and Debugging, connectedTo, FPGA Design>
+<Troubleshooting and Debugging, connectedTo, Power Integrity Analysis>
diff --git a/test/diagrams/graph_hard/diagrams_221.dot b/test/diagrams/graph_hard/diagrams_221.dot
new file mode 100644
index 0000000000000000000000000000000000000000..793c21dcaae46461a654fe0066046c89fdbef891
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_221.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=BT
+	N0 [label="ASIC Design" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+	N1 [label="Intellectual Property Protection" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+	N2 [label="Optical Module Design" color="#9575CD" fillcolor="#EDE7F6" shape=vnode_shape style=filled]
+	N3 [label="Failure Analysis" color="#9575CD" fillcolor="#EDE7F6" shape=rectangle style=filled]
+	N4 [label="Enclosure Design" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N5 [label="Mixed_Signal Design" color="#9575CD" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	N6 [label="Reliability Testing" color="#92C79A" fillcolor="#E8F0EA" shape=parallelogram style=filled]
+	N7 [label="Actuator Control" color="#9575CD" fillcolor="#EDE7F6" shape=diamond style=filled]
+	N8 [label="Material Selection" color="#9575CD" fillcolor="#EDE7F6" shape=action style=filled]
+	N9 [label="Testing and Validation" color="#6FE1D5" fillcolor="#C9EFEC" shape=parallelogram style=filled]
+	N10 [label="Firmware Development" color="#6FE1D5" fillcolor="#C9EFEC" shape=vnode_shape style=filled]
+	N11 [label="Schematic Capture" color="#92C79A" fillcolor="#E8F0EA" shape=hexagon style=filled]
+	N12 [label="RF Circuit Design" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N13 [label="FPGA Design" color="#9575CD" fillcolor="#EDE7F6" shape=inputoutput style=filled]
+	S0 [label="" color="#92C79A" fillcolor="#E8F0EA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#92C79A" fillcolor="#E8F0EA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Cost Optimization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Cost Optimization"
+		nest0_0 [label="Mechanical Design Integration" color="#9575CD" fillcolor="#EDE7F6" shape=diamond style=filled]
+		nest0_1 [label="Component Selection" color="#92C79A" fillcolor="#E8F0EA" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Electromagnetic Compatibility Testing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Electromagnetic Compatibility Testing"
+		nest1_0 [label="Cable Management" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+		nest1_1 [label="Microcontroller Programming" color="#9575CD" fillcolor="#EDE7F6" shape=document style=filled]
+		nest1_2 [label="Low_Power Design" color="#9575CD" fillcolor="#EDE7F6" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#9575CD" penwidth=1.5 style=dashed label="develops ASICs" dir=forward]
+	N3 -> N4 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#9575CD" penwidth=1.5 style=dashed label="supervises assembly" dir=forward]
+	N5 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N8 [color="#6FE1D5" penwidth=1.5 style=solid label="designs mixed_signal" dir=forward]
+	nest1_0 -> nest1_1 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N11 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#6FE1D5" penwidth=1.5 style=solid label="designs optical systems" dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=solid label="manages power" dir=forward]
+	N8 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N11 -> M0 [color="#92C79A" penwidth=1.5 style=solid label="manages EMC" dir=forward]
+	N0 -> M0 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	M0 -> N13 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N5 -> M2 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N7 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N10 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_221.txt b/test/diagrams/graph_hard/diagrams_221.txt
new file mode 100644
index 0000000000000000000000000000000000000000..90e30f108430e5e8c0be6cede063af41df8e7a30
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_221.txt
@@ -0,0 +1,30 @@
+<ASIC Design, connectedTo, FPGA Design>
+<ASIC Design, connectedTo, Intellectual Property Protection>
+<Actuator Control, connectedTo, Firmware Development>
+<Actuator Control, connectedTo, Material Selection>
+<Cable Management, connectedTo, Microcontroller Programming>
+<Component Selection, designs mixed_signal, Material Selection>
+<Enclosure Design, connectedTo, Mixed_Signal Design>
+<Enclosure Design, designs optical systems, Schematic Capture>
+<Enclosure Design, manages power, Material Selection>
+<Failure Analysis, connectedTo, Enclosure Design>
+<Failure Analysis, connectedTo, Firmware Development>
+<Firmware Development, connectedTo, Schematic Capture>
+<Intellectual Property Protection, connectedTo, Cable Management>
+<Intellectual Property Protection, connectedTo, Optical Module Design>
+<Low_Power Design, connectedTo, Schematic Capture>
+<Material Selection, connectedTo, Firmware Development>
+<Material Selection, connectedTo, Schematic Capture>
+<Material Selection, connectedTo, Testing and Validation>
+<Mechanical Design Integration, supervises assembly, Component Selection>
+<Microcontroller Programming, connectedTo, Low_Power Design>
+<Mixed_Signal Design, connectedTo, FPGA Design>
+<Mixed_Signal Design, connectedTo, Firmware Development>
+<Mixed_Signal Design, connectedTo, Mechanical Design Integration>
+<Mixed_Signal Design, connectedTo, Reliability Testing>
+<Optical Module Design, develops ASICs, Failure Analysis>
+<RF Circuit Design, connectedTo, FPGA Design>
+<Reliability Testing, connectedTo, Actuator Control>
+<Schematic Capture, connectedTo, RF Circuit Design>
+<Schematic Capture, manages EMC, FPGA Design>
+<Testing and Validation, connectedTo, Firmware Development>
diff --git a/test/diagrams/graph_hard/diagrams_222.txt b/test/diagrams/graph_hard/diagrams_222.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fcd9cf0e909a856147517cdd579a82749ac2550f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_222.txt
@@ -0,0 +1,32 @@
+<Assembly Line Optimization, connectedTo, Documentation>
+<Cable Management, connectedTo, Intellectual Property Protection>
+<Circuit Design, connectedTo, Power Integrity Analysis>
+<Circuit Design, develops RF systems, Documentation>
+<Documentation, connectedTo, Reverse Engineering>
+<FPGA Design, connectedTo, Intellectual Property Protection>
+<FPGA Design, connectedTo, Prototyping>
+<FPGA Design, connectedTo, Testing and Validation>
+<FPGA Design, designs optical systems, Mechanical Design Integration>
+<Failure Analysis, connectedTo, Thermal Management>
+<Intellectual Property Protection, connectedTo, Mechanical Design Integration>
+<Intellectual Property Protection, connectedTo, Reliability Testing>
+<Intellectual Property Protection, connectedTo, Reverse Engineering>
+<Intellectual Property Protection, connectedTo, Testing and Validation>
+<Low_Power Design, connectedTo, Cable Management>
+<Manufacturing Process Planning, connectedTo, Material Selection>
+<Mechanical Design Integration, connectedTo, Prototyping>
+<Mixed_Signal Design, connectedTo, PCB Layout>
+<Mixed_Signal Design, connectedTo, Power Integrity Analysis>
+<Mixed_Signal Design, connectedTo, Testing and Validation>
+<Optical Module Design, connectedTo, Low_Power Design>
+<PCB Layout, connectedTo, Failure Analysis>
+<PCB Layout, connectedTo, Test Fixture Design>
+<Power Integrity Analysis, creates documentation, Documentation>
+<Prototyping, connectedTo, Mixed_Signal Design>
+<Prototyping, connectedTo, Optical Module Design>
+<Reliability Testing, connectedTo, Documentation>
+<Reliability Testing, connectedTo, Mechanical Design Integration>
+<Reverse Engineering, connectedTo, Manufacturing Process Planning>
+<Test Fixture Design, connectedTo, Testing and Validation>
+<Testing and Validation, connectedTo, Circuit Design>
+<Thermal Management, connectedTo, Assembly Line Optimization>
diff --git a/test/diagrams/graph_hard/diagrams_223.txt b/test/diagrams/graph_hard/diagrams_223.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0345272e0041e564a4c12a452ccd73e1a9b172a9
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_223.txt
@@ -0,0 +1,31 @@
+<API Development, connectedTo, Widget Development>
+<Accessibility Features, enables offline access, Analytics Tracking>
+<Ad Monetization, implements biometrics, Offline Mode Development>
+<Analytics Tracking, connectedTo, Payment Gateway Integration>
+<Biometric Authentication, connectedTo, Ad Monetization>
+<Chat Functionality, implements notifications, Accessibility Features>
+<Cloud Backend for Mobile, connectedTo, Testing and Debugging>
+<Concept Development, connectedTo, Accessibility Features>
+<Concept Development, connectedTo, Deployment to App Stores>
+<Concept Development, connectedTo, IoT Device Control via App>
+<Concept Development, connectedTo, Offline Mode Development>
+<Deployment to App Stores, connectedTo, API Development>
+<Deployment to App Stores, connectedTo, IoT Device Control via App>
+<IoT Device Control via App, connectedTo, Accessibility Features>
+<IoT Device Control via App, connectedTo, Chat Functionality>
+<IoT Device Control via App, connectedTo, Cloud Backend for Mobile>
+<IoT Device Control via App, connectedTo, Payment Gateway Integration>
+<Native App Development, connectedTo, Chat Functionality>
+<Offline Mode Development, connectedTo, Cloud Backend for Mobile>
+<Offline Mode Development, connectedTo, User Experience Design>
+<Offline Mode Development, connectedTo, User Interface Design>
+<Security Implementation, connectedTo, Accessibility Features>
+<Security Implementation, connectedTo, Cloud Backend for Mobile>
+<Security Implementation, connectedTo, Concept Development>
+<Subscription Management, connectedTo, Biometric Authentication>
+<Testing and Debugging, connectedTo, Accessibility Features>
+<Testing and Debugging, connectedTo, Native App Development>
+<User Experience Design, connectedTo, Deployment to App Stores>
+<User Interface Design, connectedTo, Subscription Management>
+<Widget Development, connectedTo, Testing and Debugging>
+<Wireframing, connectedTo, Security Implementation>
diff --git a/test/diagrams/graph_hard/diagrams_224.dot b/test/diagrams/graph_hard/diagrams_224.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e949700f957772437999023e2622141a49d914e6
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_224.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=BT
+	N0 [label="AR or VR Features in Mobile" color="#DCE775" fillcolor="#F9FBE7" shape=action style=filled]
+	N1 [label="Gamification Elements" color="#DCE775" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	N2 [label="Offline Mode Development" color="#CB9BE1" fillcolor="#F2E6F5" shape=predefinedprocess style=filled]
+	N3 [label="Crash Reporting" color="#CB9BE1" fillcolor="#F2E6F5" shape=diamond style=filled]
+	N4 [label="In_App Purchase Integration" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N5 [label="Cloud Backend for Mobile" color="#DCE775" fillcolor="#F9FBE7" shape=predefinedprocess style=filled]
+	N6 [label="Backend Integration" color="#DCE775" fillcolor="#F9FBE7" shape=predefinedprocess style=filled]
+	N7 [label="Concept Development" color="#CB9BE1" fillcolor="#F2E6F5" shape=database style=filled]
+	N8 [label="User Interface Design" color="#8C9EFF" fillcolor="#D3D7EB" shape=predefinedprocess style=filled]
+	N9 [label="Database Design for Mobile" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N10 [label="Microphone Integration" color="#DCE775" fillcolor="#F9FBE7" shape=action style=filled]
+	N11 [label="Widget Development" color="#8C9EFF" fillcolor="#D3D7EB" shape=predefinedprocess style=filled]
+	S1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Updates and Maintenance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Updates and Maintenance"
+		nest0_0 [label="User Feedback Collection" color="#CB9BE1" fillcolor="#F2E6F5" shape=multipledocuments style=filled]
+		nest0_1 [label="Performance Optimization" color="#DCE775" fillcolor="#F9FBE7" shape=rectangle style=filled]
+	}
+	subgraph cluster_Deep Linking {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Deep Linking"
+		nest1_0 [label="Subscription Management" color="#8C9EFF" fillcolor="#D3D7EB" shape=predefinedprocess style=filled]
+		nest1_1 [label="Cross_Platform Development" color="#CB9BE1" fillcolor="#F2E6F5" shape=action style=filled]
+		nest1_2 [label="Prototyping" color="#8C9EFF" fillcolor="#D3D7EB" shape=action style=filled]
+		nest1_3 [label="Real_time Communication Features" color="#8C9EFF" fillcolor="#D3D7EB" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid label="enables real_time features" dir=forward]
+	N10 -> N11 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest0_0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N10 [color="#DCE775" penwidth=1.5 style=solid label="implements security" dir=forward]
+	nest1_0 -> nest1_1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#DCE775" penwidth=1.5 style=solid label="enables offline access" dir=forward]
+	N4 -> nest1_0 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N4 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#DCE775" penwidth=1.5 style=solid label="designs widgets" dir=forward]
+	N2 -> M0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N7 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	M1 -> N11 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_224.txt b/test/diagrams/graph_hard/diagrams_224.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cde3b5f58572f13c4c4d3ea0dbdfcb0cb73c6dbe
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_224.txt
@@ -0,0 +1,29 @@
+<AR or VR Features in Mobile, connectedTo, Cloud Backend for Mobile>
+<AR or VR Features in Mobile, connectedTo, Gamification Elements>
+<AR or VR Features in Mobile, connectedTo, Widget Development>
+<Backend Integration, connectedTo, Concept Development>
+<Backend Integration, connectedTo, User Feedback Collection>
+<Cloud Backend for Mobile, connectedTo, Backend Integration>
+<Concept Development, connectedTo, User Interface Design>
+<Crash Reporting, connectedTo, Cloud Backend for Mobile>
+<Crash Reporting, connectedTo, In_App Purchase Integration>
+<Crash Reporting, connectedTo, Widget Development>
+<Cross_Platform Development, connectedTo, Prototyping>
+<Database Design for Mobile, enables real_time features, Microphone Integration>
+<Gamification Elements, connectedTo, Concept Development>
+<Gamification Elements, connectedTo, Offline Mode Development>
+<In_App Purchase Integration, connectedTo, Cloud Backend for Mobile>
+<In_App Purchase Integration, connectedTo, Subscription Management>
+<In_App Purchase Integration, connectedTo, Widget Development>
+<Microphone Integration, connectedTo, Widget Development>
+<Offline Mode Development, connectedTo, Cloud Backend for Mobile>
+<Offline Mode Development, connectedTo, Concept Development>
+<Offline Mode Development, connectedTo, Crash Reporting>
+<Offline Mode Development, designs widgets, User Interface Design>
+<Performance Optimization, implements security, Microphone Integration>
+<Prototyping, enables offline access, Real_time Communication Features>
+<Real_time Communication Features, connectedTo, In_App Purchase Integration>
+<Subscription Management, connectedTo, Cross_Platform Development>
+<User Feedback Collection, connectedTo, Performance Optimization>
+<User Interface Design, connectedTo, Database Design for Mobile>
+<User Interface Design, connectedTo, Widget Development>
diff --git a/test/diagrams/graph_hard/diagrams_225.dot b/test/diagrams/graph_hard/diagrams_225.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fc41cc18efcfcabd2966ad84a31a742ec91da30c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_225.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=RL
+	N0 [label="API Development" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N1 [label="AR or VR Features in Mobile" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N2 [label="Security Implementation" color="#C0CA33" fillcolor="#F9FBE7" shape=rect style=filled]
+	N3 [label="Deep Linking" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N4 [label="Prototyping" color="#A188DB" fillcolor="#DED7F0" shape=multipledocuments style=filled]
+	N5 [label="App Store Optimization" color="#A188DB" fillcolor="#DED7F0" shape=multipledocuments style=filled]
+	N6 [label="Native App Development" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N7 [label="Gamification Elements" color="#C0CA33" fillcolor="#F9FBE7" shape=database style=filled]
+	N8 [label="User Feedback Collection" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+	N9 [label="Widget Development" color="#A188DB" fillcolor="#DED7F0" shape=database style=filled]
+	S0 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Microphone Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Microphone Integration"
+		nest0_0 [label="Chat Functionality" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+		nest0_1 [label="Database Design for Mobile" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+		nest0_2 [label="Geolocation Services" color="#DCE775" fillcolor="#FCFCE7" shape=database style=filled]
+		nest0_3 [label="User Onboarding Flows" color="#C0CA33" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Testing and Debugging {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Testing and Debugging"
+		nest1_0 [label="Backend Integration" color="#C0CA33" fillcolor="#F9FBE7" shape=preparation style=filled]
+		nest1_1 [label="In_App Purchase Integration" color="#A188DB" fillcolor="#DED7F0" shape=rect style=filled]
+		nest1_2 [label="User Experience Design" color="#DCE775" fillcolor="#FCFCE7" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest0_0 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N2 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#C0CA33" penwidth=1.5 style=dashed label="designs UIs" dir=forward]
+	N3 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N6 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N4 -> S1 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N0 -> N3 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N3 -> N7 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N6 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> N9 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_225.txt b/test/diagrams/graph_hard/diagrams_225.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a90398f0a325b69ef246df84eb66eef7bbdc894e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_225.txt
@@ -0,0 +1,26 @@
+<API Development, connectedTo, AR or VR Features in Mobile>
+<API Development, connectedTo, Deep Linking>
+<AR or VR Features in Mobile, connectedTo, Native App Development>
+<AR or VR Features in Mobile, connectedTo, Security Implementation>
+<App Store Optimization, connectedTo, Native App Development>
+<App Store Optimization, connectedTo, User Feedback Collection>
+<App Store Optimization, connectedTo, Widget Development>
+<Backend Integration, connectedTo, In_App Purchase Integration>
+<Backend Integration, connectedTo, Widget Development>
+<Chat Functionality, connectedTo, Database Design for Mobile>
+<Database Design for Mobile, connectedTo, Geolocation Services>
+<Deep Linking, connectedTo, Backend Integration>
+<Deep Linking, connectedTo, Gamification Elements>
+<Deep Linking, connectedTo, Prototyping>
+<Gamification Elements, connectedTo, User Feedback Collection>
+<Geolocation Services, connectedTo, User Onboarding Flows>
+<In_App Purchase Integration, designs UIs, User Experience Design>
+<Native App Development, connectedTo, Gamification Elements>
+<Prototyping, connectedTo, App Store Optimization>
+<Prototyping, connectedTo, Gamification Elements>
+<Prototyping, connectedTo, Native App Development>
+<Security Implementation, connectedTo, Deep Linking>
+<User Experience Design, connectedTo, Native App Development>
+<User Feedback Collection, connectedTo, Chat Functionality>
+<User Feedback Collection, connectedTo, Widget Development>
+<User Onboarding Flows, connectedTo, Security Implementation>
diff --git a/test/diagrams/graph_hard/diagrams_226.dot b/test/diagrams/graph_hard/diagrams_226.dot
new file mode 100644
index 0000000000000000000000000000000000000000..54c010c82d333e6f87f97cb228d953f63dba617b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_226.dot
@@ -0,0 +1,91 @@
+digraph {
+	rankdir=RL
+	N0 [label="Partnership Management on Social" color="#607D8B" fillcolor="#CFD8DC" shape=diamond style=filled]
+	N1 [label="Crisis Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=rectangle style=filled]
+	N2 [label="Direct Messaging Strategy" color="#6FE1D5" fillcolor="#C9EFEC" shape=predefinedprocess style=filled]
+	N3 [label="Link_in_Bio Optimization" color="#607D8B" fillcolor="#CFD8DC" shape=inputoutput style=filled]
+	N4 [label="Platform Algorithm Understanding" color="#607D8B" fillcolor="#CFD8DC" shape=vnode_shape style=filled]
+	N5 [label="Community Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=multipledocuments style=filled]
+	N6 [label="Ethical Use of Social Media" color="#6FE1D5" fillcolor="#C9EFEC" shape=predefinedprocess style=filled]
+	N7 [label="Campaign Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=parallelogram style=filled]
+	N8 [label="Content Strategy" color="#607D8B" fillcolor="#CFD8DC" shape=inputoutput style=filled]
+	N9 [label="User_Generated Content Curation" color="#F7BEE0" fillcolor="#FAEBF3" shape=action style=filled]
+	N10 [label="Platform Selection" color="#6FE1D5" fillcolor="#C9EFEC" shape=action style=filled]
+	N11 [label="Social Listening" color="#6FE1D5" fillcolor="#C9EFEC" shape=predefinedprocess style=filled]
+	N12 [label="Story Format Content Creation" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N13 [label="Reputation Management" color="#607D8B" fillcolor="#CFD8DC" shape=document style=filled]
+	N14 [label="Influencer Collaboration" color="#607D8B" fillcolor="#CFD8DC" shape=diamond style=filled]
+	N15 [label="Scheduling Posts" color="#607D8B" fillcolor="#CFD8DC" shape=database style=filled]
+	S0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#607D8B" fillcolor="#CFD8DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#F7BEE0" fillcolor="#FAEBF3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#607D8B" fillcolor="#CFD8DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#607D8B" fillcolor="#CFD8DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Social Media Audits {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Social Media Audits"
+		nest0_0 [label="Engagement Rate Calculation" color="#607D8B" fillcolor="#CFD8DC" shape=vnode_shape style=filled]
+		nest0_1 [label="Social Selling" color="#F7BEE0" fillcolor="#FAEBF3" shape=inputoutput style=filled]
+		nest0_2 [label="Live Streaming on Social Media" color="#607D8B" fillcolor="#CFD8DC" shape=rect style=filled]
+		nest0_3 [label="Group Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Polls and Quizzes Creation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Polls and Quizzes Creation"
+		nest1_0 [label="Performance Analytics" color="#607D8B" fillcolor="#CFD8DC" shape=preparation style=filled]
+		nest1_1 [label="Cross_Promotion" color="#6FE1D5" fillcolor="#C9EFEC" shape=document style=filled]
+		nest1_2 [label="Audience Engagement" color="#6FE1D5" fillcolor="#C9EFEC" shape=predefinedprocess style=filled]
+		nest1_3 [label="Competitor Analysis" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#6FE1D5" penwidth=1.5 style=solid label="tracks performance" dir=forward]
+	N2 -> N3 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> nest0_0 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N3 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N2 -> nest1_0 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N6 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#607D8B" penwidth=1.5 style=dashed label="collaborates with influencers" dir=forward]
+	S0 -> N6 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#F7BEE0" penwidth=1.5 style=dashed label="explores new features" dir=forward]
+	N10 -> S2 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	S2 -> N12 [color="#607D8B" penwidth=1.5 style=dashed label="develops brand voice" dir=forward]
+	S2 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N15 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M0 [color="#000000" penwidth=1.5 style=dashed label="manages profiles" dir=forward]
+	N3 -> M0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	M0 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N5 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_226.txt b/test/diagrams/graph_hard/diagrams_226.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8d62cf4de9e23e4a624c2a802ce165f74609a137
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_226.txt
@@ -0,0 +1,42 @@
+<Audience Engagement, connectedTo, Competitor Analysis>
+<Campaign Management, connectedTo, Content Strategy>
+<Campaign Management, manages profiles, Reputation Management>
+<Community Management, connectedTo, Ethical Use of Social Media>
+<Community Management, connectedTo, Influencer Collaboration>
+<Community Management, connectedTo, Scheduling Posts>
+<Community Management, connectedTo, Story Format Content Creation>
+<Community Management, explores new features, Content Strategy>
+<Competitor Analysis, connectedTo, Ethical Use of Social Media>
+<Content Strategy, connectedTo, User_Generated Content Curation>
+<Crisis Management, collaborates with influencers, Scheduling Posts>
+<Crisis Management, connectedTo, Ethical Use of Social Media>
+<Crisis Management, connectedTo, Influencer Collaboration>
+<Crisis Management, tracks performance, Direct Messaging Strategy>
+<Cross_Promotion, connectedTo, Audience Engagement>
+<Direct Messaging Strategy, connectedTo, Community Management>
+<Direct Messaging Strategy, connectedTo, Link_in_Bio Optimization>
+<Direct Messaging Strategy, connectedTo, Performance Analytics>
+<Engagement Rate Calculation, connectedTo, Social Selling>
+<Ethical Use of Social Media, connectedTo, Campaign Management>
+<Ethical Use of Social Media, connectedTo, Influencer Collaboration>
+<Group Management, connectedTo, Link_in_Bio Optimization>
+<Influencer Collaboration, connectedTo, Scheduling Posts>
+<Link_in_Bio Optimization, connectedTo, Community Management>
+<Link_in_Bio Optimization, connectedTo, Platform Algorithm Understanding>
+<Link_in_Bio Optimization, connectedTo, Reputation Management>
+<Live Streaming on Social Media, connectedTo, Group Management>
+<Partnership Management on Social, connectedTo, Community Management>
+<Partnership Management on Social, connectedTo, Crisis Management>
+<Partnership Management on Social, connectedTo, Reputation Management>
+<Performance Analytics, connectedTo, Cross_Promotion>
+<Platform Algorithm Understanding, connectedTo, Community Management>
+<Platform Selection, connectedTo, Reputation Management>
+<Platform Selection, connectedTo, Scheduling Posts>
+<Platform Selection, connectedTo, Social Listening>
+<Platform Selection, develops brand voice, Story Format Content Creation>
+<Reputation Management, connectedTo, Influencer Collaboration>
+<Social Listening, connectedTo, Story Format Content Creation>
+<Social Selling, connectedTo, Live Streaming on Social Media>
+<Story Format Content Creation, connectedTo, Engagement Rate Calculation>
+<Story Format Content Creation, connectedTo, Reputation Management>
+<User_Generated Content Curation, connectedTo, Platform Selection>
diff --git a/test/diagrams/graph_hard/diagrams_227.dot b/test/diagrams/graph_hard/diagrams_227.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5a2f4f73b33024c93669307dae304138e7d0235d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_227.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=BT
+	N0 [label="Follower Growth Monitoring" color="#A2D0FF" fillcolor="#E8F0FF" shape=preparation style=filled]
+	N1 [label="Influencer Collaboration" color="#A2D0FF" fillcolor="#E8F0FF" shape=diamond style=filled]
+	N2 [label="Engagement Rate Calculation" color="#FFF9AE" fillcolor="#FFFCE6" shape=inputoutput style=filled]
+	N3 [label="Competitor Analysis" color="#D3EB9F" fillcolor="#F8FDD3" shape=predefinedprocess style=filled]
+	N4 [label="Scheduling Posts" color="#A2D0FF" fillcolor="#E8F0FF" shape=action style=filled]
+	N5 [label="Reach and Impressions Tracking" color="#A2D0FF" fillcolor="#E8F0FF" shape=parallelogram style=filled]
+	N6 [label="Community Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=vnode_shape style=filled]
+	N7 [label="Hashtag Research" color="#D3EB9F" fillcolor="#F8FDD3" shape=preparation style=filled]
+	N8 [label="Social Selling" color="#D3EB9F" fillcolor="#F8FDD3" shape=predefinedprocess style=filled]
+	N9 [label="User_Generated Content Curation" color="#A2D0FF" fillcolor="#E8F0FF" shape=action style=filled]
+	S0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Story Format Content Creation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Story Format Content Creation"
+		nest0_0 [label="Crisis Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+		nest0_1 [label="Customer Service on Social Media" color="#D3EB9F" fillcolor="#F8FDD3" shape=action style=filled]
+		nest0_2 [label="Content Strategy" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	}
+	subgraph cluster_Content Moderation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Content Moderation"
+		nest1_0 [label="Platform Algorithm Understanding" color="#A2D0FF" fillcolor="#E8F0FF" shape=document style=filled]
+		nest1_1 [label="Link_in_Bio Optimization" color="#D3EB9F" fillcolor="#F8FDD3" shape=parallelogram style=filled]
+		nest1_2 [label="Reporting and Optimization" color="#D3EB9F" fillcolor="#F8FDD3" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed label="monitors trends" dir=forward]
+	N2 -> N3 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest0_0 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N6 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N6 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N6 -> S1 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N9 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_1 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_228.dot b/test/diagrams/graph_hard/diagrams_228.dot
new file mode 100644
index 0000000000000000000000000000000000000000..76cdac05372441310812f99a31d38a7cc19a99dd
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_228.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=RL
+	N0 [label="Reels or Short Video Production" color="#B0C5CD" fillcolor="#DFE7EB" shape=inputoutput style=filled]
+	N1 [label="Reporting and Optimization" color="#B0C5CD" fillcolor="#DFE7EB" shape=database style=filled]
+	N2 [label="Content Moderation" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N3 [label="Trend Monitoring" color="#F7BEE0" fillcolor="#FAEBF3" shape=multipledocuments style=filled]
+	N4 [label="Community Management" color="#B0C5CD" fillcolor="#DFE7EB" shape=action style=filled]
+	N5 [label="Platform Algorithm Understanding" color="#B0C5CD" fillcolor="#DFE7EB" shape=diamond style=filled]
+	N6 [label="Reach and Impressions Tracking" color="#F7BEE0" fillcolor="#FAEBF3" shape=rectangle style=filled]
+	N7 [label="Content Strategy" color="#90A4AE" fillcolor="#ECEFF1" shape=rect style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Social Selling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Social Selling"
+		nest0_0 [label="Platform Selection" color="#B0C5CD" fillcolor="#DFE7EB" shape=document style=filled]
+		nest0_1 [label="Link_in_Bio Optimization" color="#F7BEE0" fillcolor="#FAEBF3" shape=multipledocuments style=filled]
+		nest0_2 [label="Scheduling Posts" color="#F7BEE0" fillcolor="#FAEBF3" shape=rectangle style=filled]
+		nest0_3 [label="Performance Analytics" color="#90A4AE" fillcolor="#ECEFF1" shape=action style=filled]
+	}
+	subgraph cluster_Reputation Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Reputation Management"
+		nest1_0 [label="Story Format Content Creation" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+		nest1_1 [label="Brand Voice Development" color="#B0C5CD" fillcolor="#DFE7EB" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#90A4AE" penwidth=1.5 style=dashed label="generates reports" dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed label="supports customers" dir=forward]
+	N6 -> N7 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid label="manages profiles" dir=forward]
+	nest0_1 -> nest0_2 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N4 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest1_0 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N0 -> S1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N2 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N0 -> S2 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N2 [color="#F7BEE0" penwidth=1.5 style=solid label="creates content" dir=forward]
+	S2 -> N5 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N5 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_228.txt b/test/diagrams/graph_hard/diagrams_228.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f85d4559f048c41208561107cd6c28ac9917b503
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_228.txt
@@ -0,0 +1,27 @@
+<Brand Voice Development, connectedTo, Content Moderation>
+<Community Management, connectedTo, Content Strategy>
+<Community Management, connectedTo, Platform Algorithm Understanding>
+<Community Management, connectedTo, Reach and Impressions Tracking>
+<Content Moderation, connectedTo, Platform Algorithm Understanding>
+<Content Moderation, generates reports, Trend Monitoring>
+<Link_in_Bio Optimization, connectedTo, Scheduling Posts>
+<Performance Analytics, connectedTo, Community Management>
+<Platform Algorithm Understanding, connectedTo, Platform Selection>
+<Platform Algorithm Understanding, supports customers, Reach and Impressions Tracking>
+<Platform Selection, manages profiles, Link_in_Bio Optimization>
+<Reach and Impressions Tracking, connectedTo, Content Strategy>
+<Reach and Impressions Tracking, connectedTo, Story Format Content Creation>
+<Reels or Short Video Production, connectedTo, Content Moderation>
+<Reels or Short Video Production, connectedTo, Platform Algorithm Understanding>
+<Reels or Short Video Production, connectedTo, Reach and Impressions Tracking>
+<Reels or Short Video Production, connectedTo, Reporting and Optimization>
+<Reels or Short Video Production, connectedTo, Trend Monitoring>
+<Reels or Short Video Production, creates content, Content Moderation>
+<Reporting and Optimization, connectedTo, Content Moderation>
+<Reporting and Optimization, connectedTo, Platform Algorithm Understanding>
+<Reporting and Optimization, connectedTo, Reach and Impressions Tracking>
+<Scheduling Posts, connectedTo, Performance Analytics>
+<Story Format Content Creation, connectedTo, Brand Voice Development>
+<Trend Monitoring, connectedTo, Community Management>
+<Trend Monitoring, connectedTo, Platform Algorithm Understanding>
+<Trend Monitoring, connectedTo, Reach and Impressions Tracking>
diff --git a/test/diagrams/graph_hard/diagrams_229.dot b/test/diagrams/graph_hard/diagrams_229.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ce3ffc5258ccaca9c5af7ede64745a7f8778bb39
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_229.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=BT
+	N0 [label="Competitor Keyword Analysis" color="#61CAC3" fillcolor="#C2E8E6" shape=rect style=filled]
+	N1 [label="Query Processing" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N2 [label="Site Architecture Optimization" color="#61CAC3" fillcolor="#C2E8E6" shape=rectangle style=filled]
+	N3 [label="Voice Search Optimization" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N4 [label="Rank Tracking" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N5 [label="Algorithm Updates Monitoring" color="#4DD0E1" fillcolor="#C9F0F0" shape=multipledocuments style=filled]
+	N6 [label="Off_Page SEO" color="#3F51B5" fillcolor="#C5CAE9" shape=document style=filled]
+	N7 [label="User Intent Understanding" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N8 [label="Local SEO" color="#3F51B5" fillcolor="#C5CAE9" shape=parallelogram style=filled]
+	N9 [label="Ranking Algorithms" color="#61CAC3" fillcolor="#C2E8E6" shape=vnode_shape style=filled]
+	N10 [label="Click_Through Rate Optimization" color="#61CAC3" fillcolor="#C2E8E6" shape=rect style=filled]
+	N11 [label="Video Search" color="#61CAC3" fillcolor="#C2E8E6" shape=multipledocuments style=filled]
+	N12 [label="Search Console Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N13 [label="Google My Business Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=rectangle style=filled]
+	N14 [label="Featured Snippets Optimization" color="#3F51B5" fillcolor="#C5CAE9" shape=inputoutput style=filled]
+	N15 [label="Keyword Research" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	S0 [label="" color="#61CAC3" fillcolor="#C2E8E6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4DD0E1" fillcolor="#C9F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Search Result Display {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Search Result Display"
+		nest0_0 [label="Mobile_First Indexing" color="#3F51B5" fillcolor="#C5CAE9" shape=vnode_shape style=filled]
+		nest0_1 [label="Core Web Vitals Optimization" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+	}
+	subgraph cluster_Search Engine Optimization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Search Engine Optimization"
+		nest1_0 [label="Penalties Recovery" color="#4DD0E1" fillcolor="#C9F0F0" shape=rect style=filled]
+		nest1_1 [label="Indexing Content" color="#3F51B5" fillcolor="#C5CAE9" shape=predefinedprocess style=filled]
+		nest1_2 [label="Semantic Search" color="#3F51B5" fillcolor="#C5CAE9" shape=preparation style=filled]
+		nest1_3 [label="On_Page SEO" color="#3F51B5" fillcolor="#C5CAE9" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#3F51B5" penwidth=1.5 style=dashed label="creates content" dir=forward]
+	N3 -> N4 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#3F51B5" penwidth=1.5 style=solid label="handles shopping queries" dir=forward]
+	N8 -> N9 [color="#4DD0E1" penwidth=1.5 style=solid label="uses semantics" dir=forward]
+	N9 -> N10 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest0_0 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N10 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest1_0 [color="#4DD0E1" penwidth=1.5 style=solid label="indexes news" dir=forward]
+	nest1_3 -> N7 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S1 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M2 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M2 -> N10 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_229.txt b/test/diagrams/graph_hard/diagrams_229.txt
new file mode 100644
index 0000000000000000000000000000000000000000..25ad05b25088c0acda8e308b4cf919c34f6a5c62
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_229.txt
@@ -0,0 +1,32 @@
+<Algorithm Updates Monitoring, connectedTo, Click_Through Rate Optimization>
+<Algorithm Updates Monitoring, connectedTo, Off_Page SEO>
+<Click_Through Rate Optimization, connectedTo, Mobile_First Indexing>
+<Click_Through Rate Optimization, connectedTo, Video Search>
+<Competitor Keyword Analysis, connectedTo, Query Processing>
+<Core Web Vitals Optimization, connectedTo, Click_Through Rate Optimization>
+<Featured Snippets Optimization, connectedTo, Keyword Research>
+<Google My Business Management, connectedTo, Featured Snippets Optimization>
+<Google My Business Management, indexes news, Penalties Recovery>
+<Indexing Content, connectedTo, Semantic Search>
+<Local SEO, uses semantics, Ranking Algorithms>
+<Mobile_First Indexing, connectedTo, Core Web Vitals Optimization>
+<Off_Page SEO, connectedTo, Ranking Algorithms>
+<Off_Page SEO, connectedTo, Search Console Management>
+<Off_Page SEO, connectedTo, User Intent Understanding>
+<Off_Page SEO, connectedTo, Video Search>
+<On_Page SEO, connectedTo, User Intent Understanding>
+<Penalties Recovery, connectedTo, Indexing Content>
+<Query Processing, connectedTo, Search Console Management>
+<Query Processing, connectedTo, Site Architecture Optimization>
+<Rank Tracking, connectedTo, Algorithm Updates Monitoring>
+<Ranking Algorithms, connectedTo, Click_Through Rate Optimization>
+<Search Console Management, connectedTo, Google My Business Management>
+<Semantic Search, connectedTo, On_Page SEO>
+<Site Architecture Optimization, creates content, Voice Search Optimization>
+<User Intent Understanding, connectedTo, Click_Through Rate Optimization>
+<User Intent Understanding, handles shopping queries, Local SEO>
+<Video Search, connectedTo, Search Console Management>
+<Voice Search Optimization, connectedTo, Click_Through Rate Optimization>
+<Voice Search Optimization, connectedTo, Rank Tracking>
+<Voice Search Optimization, connectedTo, Search Console Management>
+<Voice Search Optimization, connectedTo, User Intent Understanding>
diff --git a/test/diagrams/graph_hard/diagrams_23.dot b/test/diagrams/graph_hard/diagrams_23.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3af21b00531ff187866d5acddf5937a01adbc421
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_23.dot
@@ -0,0 +1,86 @@
+digraph {
+	rankdir=BT
+	N0 [label="Pro Bono Work" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N1 [label="Due Diligence" color="#61CAC3" fillcolor="#C2E8E6" shape=predefinedprocess style=filled]
+	N2 [label="Client Interview" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N3 [label="Evidence Collection" color="#61CAC3" fillcolor="#C2E8E6" shape=vnode_shape style=filled]
+	N4 [label="Trial Session" color="#7986CB" fillcolor="#E8EAF6" shape=diamond style=filled]
+	N5 [label="Enforcement" color="#7986CB" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	N6 [label="Amicus Brief Submission" color="#7986CB" fillcolor="#E8EAF6" shape=rectangle style=filled]
+	N7 [label="Jury Selection" color="#EAEFA5" fillcolor="#FDFCEB" shape=inputoutput style=filled]
+	N8 [label="Discovery Process" color="#7986CB" fillcolor="#E8EAF6" shape=preparation style=filled]
+	N9 [label="Divorce Proceedings" color="#7986CB" fillcolor="#E8EAF6" shape=action style=filled]
+	N10 [label="Cross_Examination" color="#61CAC3" fillcolor="#C2E8E6" shape=database style=filled]
+	N11 [label="Intel Property Licensing" color="#61CAC3" fillcolor="#C2E8E6" shape=parallelogram style=filled]
+	N12 [label="Sentencing" color="#7986CB" fillcolor="#E8EAF6" shape=multipledocuments style=filled]
+	N13 [label="Bankruptcy Filing" color="#61CAC3" fillcolor="#C2E8E6" shape=preparation style=filled]
+	N14 [label="Copyright Infringement" color="#61CAC3" fillcolor="#C2E8E6" shape=inputoutput style=filled]
+	S0 [label="" color="#7986CB" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#61CAC3" fillcolor="#C2E8E6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#61CAC3" fillcolor="#C2E8E6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Bail Hearing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Bail Hearing"
+		nest0_0 [label="Settlement Negotiation" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+		nest0_1 [label="Witness Testimony" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+		nest0_2 [label="Trademark Registration" color="#61CAC3" fillcolor="#C2E8E6" shape=diamond style=filled]
+		nest0_3 [label="Pre_Trial Hearing" color="#7986CB" fillcolor="#E8EAF6" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Case Filing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Case Filing"
+		nest1_0 [label="Notarization" color="#EAEFA5" fillcolor="#FDFCEB" shape=hexagon style=filled]
+		nest1_1 [label="Verdict Announcement" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+		nest1_2 [label="Court Order Execution" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+		nest1_3 [label="Contract Review" color="#EAEFA5" fillcolor="#FDFCEB" shape=database style=filled]
+	}
+	N0 -> N1 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#EAEFA5" penwidth=1.5 style=solid label="defends" dir=forward]
+	N10 -> N11 [color="#EAEFA5" penwidth=1.5 style=dashed label="hears" dir=forward]
+	N11 -> N12 [color="#7986CB" penwidth=1.5 style=dashed label="executes" dir=forward]
+	N12 -> N13 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest0_0 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N1 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#61CAC3" penwidth=1.5 style=solid label="counsels" dir=forward]
+	nest1_3 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> S0 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S1 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#61CAC3" penwidth=1.5 style=solid label="litigates" dir=forward]
+	S1 -> N9 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N8 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	S2 -> N14 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	S2 -> N13 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N11 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	M1 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=dashed label="challenges" dir=forward]
+	M2 -> N3 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_23.txt b/test/diagrams/graph_hard/diagrams_23.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7f2b8b31932b693008a2d7121ae3783ac5795956
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_23.txt
@@ -0,0 +1,37 @@
+<Amicus Brief Submission, connectedTo, Jury Selection>
+<Bankruptcy Filing, connectedTo, Copyright Infringement>
+<Client Interview, connectedTo, Evidence Collection>
+<Contract Review, connectedTo, Discovery Process>
+<Court Order Execution, connectedTo, Contract Review>
+<Cross_Examination, hears, Intel Property Licensing>
+<Discovery Process, connectedTo, Divorce Proceedings>
+<Divorce Proceedings, defends, Cross_Examination>
+<Due Diligence, challenges, Evidence Collection>
+<Due Diligence, connectedTo, Client Interview>
+<Enforcement, connectedTo, Amicus Brief Submission>
+<Enforcement, connectedTo, Intel Property Licensing>
+<Evidence Collection, connectedTo, Bankruptcy Filing>
+<Evidence Collection, connectedTo, Copyright Infringement>
+<Evidence Collection, connectedTo, Discovery Process>
+<Evidence Collection, connectedTo, Trial Session>
+<Intel Property Licensing, connectedTo, Bankruptcy Filing>
+<Intel Property Licensing, connectedTo, Copyright Infringement>
+<Intel Property Licensing, executes, Sentencing>
+<Jury Selection, connectedTo, Discovery Process>
+<Notarization, connectedTo, Verdict Announcement>
+<Pre_Trial Hearing, connectedTo, Due Diligence>
+<Pro Bono Work, connectedTo, Divorce Proceedings>
+<Pro Bono Work, connectedTo, Due Diligence>
+<Pro Bono Work, connectedTo, Evidence Collection>
+<Pro Bono Work, connectedTo, Intel Property Licensing>
+<Pro Bono Work, connectedTo, Sentencing>
+<Pro Bono Work, litigates, Cross_Examination>
+<Sentencing, connectedTo, Bankruptcy Filing>
+<Sentencing, connectedTo, Settlement Negotiation>
+<Settlement Negotiation, connectedTo, Witness Testimony>
+<Trademark Registration, connectedTo, Pre_Trial Hearing>
+<Trial Session, connectedTo, Discovery Process>
+<Trial Session, connectedTo, Enforcement>
+<Trial Session, counsels, Notarization>
+<Verdict Announcement, connectedTo, Court Order Execution>
+<Witness Testimony, connectedTo, Trademark Registration>
diff --git a/test/diagrams/graph_hard/diagrams_230.dot b/test/diagrams/graph_hard/diagrams_230.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e8573eaa8f786d220d34bb7b440fb16d97a8acee
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_230.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=TB
+	N0 [label="Content Quality Assessment" color="#BDAFA8" fillcolor="#E4E0DF" shape=database style=filled]
+	N1 [label="International SEO" color="#BDAFA8" fillcolor="#E4E0DF" shape=diamond style=filled]
+	N2 [label="Google My Business Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=database style=filled]
+	N3 [label="Local SEO" color="#BDAFA8" fillcolor="#E4E0DF" shape=database style=filled]
+	N4 [label="Negative SEO Prevention" color="#FFB2A5" fillcolor="#FFDCD6" shape=rect style=filled]
+	N5 [label="Off_Page SEO" color="#FFB2A5" fillcolor="#FFDCD6" shape=document style=filled]
+	N6 [label="Paid Search Advertising" color="#BDAFA8" fillcolor="#E4E0DF" shape=parallelogram style=filled]
+	N7 [label="Featured Snippets Optimization" color="#FFB2A5" fillcolor="#FFDCD6" shape=diamond style=filled]
+	N8 [label="Competitor Keyword Analysis" color="#FFB2A5" fillcolor="#FFDCD6" shape=vnode_shape style=filled]
+	N9 [label="Schema Markup Implementation" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N10 [label="Knowledge Graph Integration" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N11 [label="Ranking Algorithms" color="#CD8FF2" fillcolor="#ECCFF5" shape=document style=filled]
+	N12 [label="Video Search" color="#CD8FF2" fillcolor="#ECCFF5" shape=database style=filled]
+	N13 [label="Search Engine Marketing Strategy" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+	N14 [label="Mobile_First Indexing" color="#CD8FF2" fillcolor="#ECCFF5" shape=vnode_shape style=filled]
+	N15 [label="Semantic Search" color="#BDAFA8" fillcolor="#E4E0DF" shape=document style=filled]
+	N16 [label="Rank Tracking" color="#CD8FF2" fillcolor="#ECCFF5" shape=predefinedprocess style=filled]
+	N17 [label="Shopping Search" color="#BDAFA8" fillcolor="#E4E0DF" shape=multipledocuments style=filled]
+	N18 [label="Search Result Display" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	S0 [label="" color="#BDAFA8" fillcolor="#E4E0DF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFB2A5" fillcolor="#FFDCD6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFB2A5" fillcolor="#FFDCD6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFB2A5" fillcolor="#FFDCD6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Search Engine Optimization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Search Engine Optimization"
+		nest0_0 [label="Indexing Content" color="#CD8FF2" fillcolor="#ECCFF5" shape=hexagon style=filled]
+		nest0_1 [label="Voice Search Optimization" color="#BDAFA8" fillcolor="#E4E0DF" shape=database style=filled]
+		nest0_2 [label="Query Processing" color="#FFB2A5" fillcolor="#FFDCD6" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Technical SEO {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Technical SEO"
+		nest1_0 [label="User Intent Understanding" color="#BDAFA8" fillcolor="#E4E0DF" shape=vnode_shape style=filled]
+		nest1_1 [label="Image Search" color="#CD8FF2" fillcolor="#ECCFF5" shape=preparation style=filled]
+		nest1_2 [label="Site Architecture Optimization" color="#BDAFA8" fillcolor="#E4E0DF" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#BDAFA8" penwidth=1.5 style=dashed label="handles negative SEO" dir=forward]
+	N1 -> N2 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#FFB2A5" penwidth=1.5 style=dashed label="designs site architecture" dir=forward]
+	N11 -> N12 [color="#BDAFA8" penwidth=1.5 style=dashed label="optimizes for mobile" dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N17 -> N18 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> nest0_0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N9 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N10 -> nest1_0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N13 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N9 -> S0 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N18 [color="#BDAFA8" penwidth=1.5 style=dashed label="indexes academic papers" dir=forward]
+	S0 -> N12 [color="#CD8FF2" penwidth=1.5 style=dashed label="handles voice search" dir=forward]
+	N5 -> S1 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+	N13 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N17 [color="#CD8FF2" penwidth=1.5 style=dashed label="optimizes local search" dir=forward]
+	S2 -> N18 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M0 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+	N11 -> M0 [color="#BDAFA8" penwidth=1.5 style=solid dir=forward]
+	M0 -> N18 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N10 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	M1 -> N16 [color="#BDAFA8" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_230.txt b/test/diagrams/graph_hard/diagrams_230.txt
new file mode 100644
index 0000000000000000000000000000000000000000..32b8c9a1a992776c056e99aa2fb04f8d3310d8a4
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_230.txt
@@ -0,0 +1,39 @@
+<Competitor Keyword Analysis, connectedTo, Schema Markup Implementation>
+<Content Quality Assessment, handles negative SEO, International SEO>
+<Featured Snippets Optimization, connectedTo, Competitor Keyword Analysis>
+<Featured Snippets Optimization, connectedTo, Search Result Display>
+<Google My Business Management, connectedTo, Local SEO>
+<Google My Business Management, connectedTo, Rank Tracking>
+<Image Search, connectedTo, Site Architecture Optimization>
+<Indexing Content, connectedTo, Voice Search Optimization>
+<International SEO, connectedTo, Google My Business Management>
+<Knowledge Graph Integration, connectedTo, Rank Tracking>
+<Knowledge Graph Integration, connectedTo, User Intent Understanding>
+<Knowledge Graph Integration, designs site architecture, Ranking Algorithms>
+<Local SEO, connectedTo, Negative SEO Prevention>
+<Mobile_First Indexing, connectedTo, Semantic Search>
+<Negative SEO Prevention, connectedTo, Off_Page SEO>
+<Off_Page SEO, connectedTo, Featured Snippets Optimization>
+<Off_Page SEO, connectedTo, Paid Search Advertising>
+<Off_Page SEO, connectedTo, Rank Tracking>
+<Off_Page SEO, connectedTo, Ranking Algorithms>
+<Off_Page SEO, connectedTo, Semantic Search>
+<Paid Search Advertising, connectedTo, Featured Snippets Optimization>
+<Paid Search Advertising, connectedTo, Search Result Display>
+<Query Processing, connectedTo, Schema Markup Implementation>
+<Rank Tracking, connectedTo, Shopping Search>
+<Ranking Algorithms, connectedTo, Indexing Content>
+<Ranking Algorithms, connectedTo, Search Result Display>
+<Ranking Algorithms, optimizes for mobile, Video Search>
+<Schema Markup Implementation, connectedTo, Knowledge Graph Integration>
+<Schema Markup Implementation, handles voice search, Video Search>
+<Schema Markup Implementation, indexes academic papers, Search Result Display>
+<Search Engine Marketing Strategy, connectedTo, Mobile_First Indexing>
+<Search Engine Marketing Strategy, connectedTo, Search Result Display>
+<Search Engine Marketing Strategy, optimizes local search, Shopping Search>
+<Semantic Search, connectedTo, Rank Tracking>
+<Shopping Search, connectedTo, Search Result Display>
+<Site Architecture Optimization, connectedTo, Search Engine Marketing Strategy>
+<User Intent Understanding, connectedTo, Image Search>
+<Video Search, connectedTo, Search Engine Marketing Strategy>
+<Voice Search Optimization, connectedTo, Query Processing>
diff --git a/test/diagrams/graph_hard/diagrams_231.txt b/test/diagrams/graph_hard/diagrams_231.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d4d21503020795591e0af76cf47f6982f736d461
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_231.txt
@@ -0,0 +1,35 @@
+<Click_Through Rate Optimization, connectedTo, Paid Search Advertising>
+<Click_Through Rate Optimization, connectedTo, Personalized Search Results>
+<Click_Through Rate Optimization, connectedTo, Query Processing>
+<Click_Through Rate Optimization, connectedTo, Search Console Management>
+<Click_Through Rate Optimization, connectedTo, Shopping Search>
+<Click_Through Rate Optimization, designs site architecture, Rank Tracking>
+<Competitor Keyword Analysis, connectedTo, Technical SEO>
+<Content Quality Assessment, connectedTo, Query Processing>
+<Core Web Vitals Optimization, connectedTo, Keyword Research>
+<Crawling Websites, connectedTo, Local SEO>
+<Keyword Research, connectedTo, Mobile_First Indexing>
+<Local SEO, connectedTo, Click_Through Rate Optimization>
+<Local SEO, connectedTo, Competitor Keyword Analysis>
+<Local SEO, connectedTo, Ranking Algorithms>
+<Local SEO, processes queries, Search Console Management>
+<Mobile_First Indexing, connectedTo, Content Quality Assessment>
+<Negative SEO Prevention, connectedTo, Crawling Websites>
+<Off_Page SEO, connectedTo, Local SEO>
+<Off_Page SEO, connectedTo, Search Console Management>
+<Paid Search Advertising, manages international SEO, Search Result Display>
+<Paid Search Advertising, uses semantics, Competitor Keyword Analysis>
+<Penalties Recovery, detects spam, Ranking Algorithms>
+<Personalized Search Results, connectedTo, Penalties Recovery>
+<Query Processing, connectedTo, Competitor Keyword Analysis>
+<Query Processing, manages GMB, Semantic Search>
+<Ranking Algorithms, connectedTo, Rank Tracking>
+<Search Console Management, connectedTo, Competitor Keyword Analysis>
+<Search Console Management, connectedTo, Content Quality Assessment>
+<Search Console Management, connectedTo, Negative SEO Prevention>
+<Search Console Management, connectedTo, Paid Search Advertising>
+<Search Result Display, connectedTo, Core Web Vitals Optimization>
+<Semantic Search, connectedTo, Paid Search Advertising>
+<Shopping Search, connectedTo, Search Console Management>
+<Technical SEO, connectedTo, Ranking Algorithms>
+<Technical SEO, uses search console, Personalized Search Results>
diff --git a/test/diagrams/graph_hard/diagrams_232.txt b/test/diagrams/graph_hard/diagrams_232.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9c46dafbcf744df6ded934c45fc1ba8eb963c71d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_232.txt
@@ -0,0 +1,27 @@
+<API Security for Identity, connectedTo, Blockchain_based Identity>
+<API Security for Identity, connectedTo, De_provisioning>
+<API Security for Identity, connectedTo, Fraud Detection in Identity>
+<API Security for Identity, connectedTo, Identity as a Service>
+<API Security for Identity, connectedTo, Workforce Identity Management>
+<Adaptive Authentication, connectedTo, Identity Threat Detection and Response>
+<Attribute Management, connectedTo, Consent Management>
+<Attribute Management, connectedTo, Identity as a Service>
+<Attribute Management, connectedTo, Social Login Integration>
+<Authorization, connectedTo, Adaptive Authentication>
+<Blockchain_based Identity, connectedTo, De_provisioning>
+<Blockchain_based Identity, provisions users, Workforce Identity Management>
+<Credential Management, minimizes data, User Provisioning>
+<Data Minimization Principles, connectedTo, Consent Management>
+<De_provisioning, connectedTo, Verifiable Credentials>
+<De_provisioning, connectedTo, Workforce Identity Management>
+<Federated Identity Management, connectedTo, Identity Proofing>
+<Fraud Detection in Identity, connectedTo, KYC Integration>
+<Identity Proofing, connectedTo, Attribute Management>
+<Identity Proofing, connectedTo, Authorization>
+<Identity Threat Detection and Response, connectedTo, Data Minimization Principles>
+<Identity as a Service, ensures privacy, Consent Management>
+<KYC Integration, connectedTo, Federated Identity Management>
+<Social Login Integration, connectedTo, Identity as a Service>
+<User Provisioning, detects fraud, Consent Management>
+<Verifiable Credentials, connectedTo, Credential Management>
+<Workforce Identity Management, connectedTo, Fraud Detection in Identity>
diff --git a/test/diagrams/graph_hard/diagrams_233.txt b/test/diagrams/graph_hard/diagrams_233.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8ea02ce9404fd2b83887514e529025f6192089ab
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_233.txt
@@ -0,0 +1,33 @@
+<Access Governance, connectedTo, Password Management>
+<Access Governance, connectedTo, Privileged Access Management>
+<Access Governance, connectedTo, Social Login Integration>
+<Access Governance, connectedTo, User Registration>
+<Adaptive Authentication, connectedTo, Single Sign_On>
+<Attribute Management, provisions users, Access Governance>
+<Compliance with Data Protection Regulations, connectedTo, Access Governance>
+<Compliance with Data Protection Regulations, connectedTo, User Registration>
+<Credential Management, connectedTo, Identity as a Service>
+<Digital Wallets for Identity, connectedTo, Single Sign_On>
+<Federated Identity Management, connectedTo, Digital Wallets for Identity>
+<Identity as a Service, connectedTo, Non_Repudiation>
+<Identity as a Service, connectedTo, Password Management>
+<Identity as a Service, connectedTo, Risk_Based Authentication>
+<KYC Integration, connectedTo, User Provisioning>
+<KYC Integration, connectedTo, User Registration>
+<Non_Repudiation, connectedTo, Verifiable Credentials>
+<Password Management, connectedTo, API Security for Identity>
+<Password Management, connectedTo, Adaptive Authentication>
+<Password Management, connectedTo, Privacy Management>
+<Password Management, connectedTo, Single Sign_On>
+<Privacy Management, connectedTo, Adaptive Authentication>
+<Privacy Management, connectedTo, Federated Identity Management>
+<Privileged Access Management, connectedTo, KYC Integration>
+<Privileged Access Management, connectedTo, User Registration>
+<Risk_Based Authentication, manages passwords, Attribute Management>
+<Single Sign_On, connectedTo, API Security for Identity>
+<Social Login Integration, connectedTo, Password Management>
+<User Provisioning, connectedTo, Password Management>
+<User Provisioning, connectedTo, User Registration>
+<User Registration, implements PAM, Credential Management>
+<Verifiable Credentials, connectedTo, Social Login Integration>
+<Verifiable Credentials, detects fraud, Password Management>
diff --git a/test/diagrams/graph_hard/diagrams_234.dot b/test/diagrams/graph_hard/diagrams_234.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a8fae3026837527c2fc8f8d33e2d032d8b0b5385
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_234.dot
@@ -0,0 +1,85 @@
+digraph {
+	rankdir=LR
+	N0 [label="KYC Integration" color="#C2B2F0" fillcolor="#EFE6FF" shape=predefinedprocess style=filled]
+	N1 [label="User Provisioning" color="#C2B2F0" fillcolor="#EFE6FF" shape=hexagon style=filled]
+	N2 [label="Non_Repudiation" color="#C2B2F0" fillcolor="#EFE6FF" shape=inputoutput style=filled]
+	N3 [label="Verifiable Credentials" color="#C2B2F0" fillcolor="#EFE6FF" shape=multipledocuments style=filled]
+	N4 [label="Social Login Integration" color="#00BCD4" fillcolor="#B2EBF2" shape=vnode_shape style=filled]
+	N5 [label="Privacy Management" color="#66BB6A" fillcolor="#E8F5E9" shape=database style=filled]
+	N6 [label="Biometric Authentication" color="#66BB6A" fillcolor="#E8F5E9" shape=diamond style=filled]
+	N7 [label="Digital Certificates" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N8 [label="Blockchain_based Identity" color="#C2B2F0" fillcolor="#EFE6FF" shape=rect style=filled]
+	N9 [label="Privileged Access Management" color="#66BB6A" fillcolor="#E8F5E9" shape=database style=filled]
+	N10 [label="Decentralized Identifiers" color="#C2B2F0" fillcolor="#EFE6FF" shape=rectangle style=filled]
+	N11 [label="Identity Lifecycle Management" color="#00BCD4" fillcolor="#B2EBF2" shape=inputoutput style=filled]
+	N12 [label="Identity as a Service" color="#00BCD4" fillcolor="#B2EBF2" shape=rectangle style=filled]
+	N13 [label="Access Governance" color="#66BB6A" fillcolor="#E8F5E9" shape=vnode_shape style=filled]
+	N14 [label="Digital Wallets for Identity" color="#C2B2F0" fillcolor="#EFE6FF" shape=rectangle style=filled]
+	N15 [label="Adaptive Authentication" color="#00BCD4" fillcolor="#B2EBF2" shape=diamond style=filled]
+	N16 [label="Compliance with Data Protection Regulations" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N17 [label="User Registration" color="#00BCD4" fillcolor="#B2EBF2" shape=database style=filled]
+	N18 [label="Password Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=database style=filled]
+	S0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_De_provisioning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="De_provisioning"
+		nest0_0 [label="Consent Management" color="#00BCD4" fillcolor="#B2EBF2" shape=predefinedprocess style=filled]
+		nest0_1 [label="Credential Management" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest0_2 [label="Authentication" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+		nest0_3 [label="Multi_Factor Authentication" color="#C2B2F0" fillcolor="#EFE6FF" shape=preparation style=filled]
+	}
+	subgraph cluster_Data Minimization Principles {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Data Minimization Principles"
+		nest1_0 [label="API Security for Identity" color="#00BCD4" fillcolor="#B2EBF2" shape=rect style=filled]
+		nest1_1 [label="Digital Signatures" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+		nest1_2 [label="Identity Proofing" color="#C2B2F0" fillcolor="#EFE6FF" shape=database style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N17 -> N18 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#C2B2F0" penwidth=1.5 style=solid label="issues certificates" dir=forward]
+	nest0_1 -> nest0_2 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N9 [color="#66BB6A" penwidth=1.5 style=dashed label="registers identities" dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N15 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed label="manages passwords" dir=forward]
+	nest1_2 -> N6 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S0 -> N18 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#66BB6A" penwidth=1.5 style=solid label="creates portable identities" dir=forward]
+	S1 -> N15 [color="#C2B2F0" penwidth=1.5 style=dashed label="provides IDaaS" dir=forward]
+	N9 -> M0 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N12 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#C2B2F0" penwidth=1.5 style=solid label="performs KYCs" dir=forward]
+	N6 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N15 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_234.txt b/test/diagrams/graph_hard/diagrams_234.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4de10b842cfc10da462ebaeedf9fff61b4f8f34b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_234.txt
@@ -0,0 +1,42 @@
+<API Security for Identity, connectedTo, Digital Signatures>
+<Access Governance, connectedTo, Digital Wallets for Identity>
+<Adaptive Authentication, connectedTo, Compliance with Data Protection Regulations>
+<Adaptive Authentication, manages passwords, API Security for Identity>
+<Authentication, connectedTo, Multi_Factor Authentication>
+<Authentication, partOf, Authentication>
+<Biometric Authentication, connectedTo, Adaptive Authentication>
+<Biometric Authentication, connectedTo, Digital Certificates>
+<Blockchain_based Identity, connectedTo, Privileged Access Management>
+<Blockchain_based Identity, creates portable identities, Identity Lifecycle Management>
+<Blockchain_based Identity, provides IDaaS, Adaptive Authentication>
+<Compliance with Data Protection Regulations, connectedTo, User Registration>
+<Consent Management, issues certificates, Credential Management>
+<Consent Management, partOf, Consent Management>
+<Credential Management, connectedTo, Authentication>
+<Credential Management, partOf, Credential Management>
+<Decentralized Identifiers, connectedTo, Identity Lifecycle Management>
+<Digital Certificates, connectedTo, Blockchain_based Identity>
+<Digital Signatures, connectedTo, Identity Proofing>
+<Digital Wallets for Identity, connectedTo, Adaptive Authentication>
+<Identity Lifecycle Management, connectedTo, Identity as a Service>
+<Identity Proofing, connectedTo, Biometric Authentication>
+<Identity as a Service, connectedTo, Access Governance>
+<Identity as a Service, connectedTo, Consent Management>
+<KYC Integration, connectedTo, Identity as a Service>
+<KYC Integration, connectedTo, User Provisioning>
+<Multi_Factor Authentication, partOf, Multi_Factor Authentication>
+<Multi_Factor Authentication, registers identities, Privileged Access Management>
+<Non_Repudiation, connectedTo, Identity as a Service>
+<Non_Repudiation, connectedTo, Verifiable Credentials>
+<Privacy Management, connectedTo, Biometric Authentication>
+<Privacy Management, connectedTo, Identity as a Service>
+<Privileged Access Management, connectedTo, Decentralized Identifiers>
+<Privileged Access Management, connectedTo, Identity as a Service>
+<Social Login Integration, connectedTo, Biometric Authentication>
+<Social Login Integration, connectedTo, Identity Lifecycle Management>
+<Social Login Integration, connectedTo, Password Management>
+<Social Login Integration, connectedTo, Privacy Management>
+<User Provisioning, connectedTo, Non_Repudiation>
+<User Provisioning, performs KYCs, Adaptive Authentication>
+<User Registration, connectedTo, Password Management>
+<Verifiable Credentials, connectedTo, Social Login Integration>
diff --git a/test/diagrams/graph_hard/diagrams_235.dot b/test/diagrams/graph_hard/diagrams_235.dot
new file mode 100644
index 0000000000000000000000000000000000000000..623ffec9852864a12bbfef11dc604db6d072dc5d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_235.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=BT
+	N0 [label="Learning Management System Administration" color="#FFC085" fillcolor="#FFDAB9" shape=predefinedprocess style=filled]
+	N1 [label="Learning Analytics" color="#FFC085" fillcolor="#FFDAB9" shape=action style=filled]
+	N2 [label="Open Educational Resources Integration" color="#F44336" fillcolor="#FFCDD2" shape=multipledocuments style=filled]
+	N3 [label="Certification Issuance" color="#9FA9E1" fillcolor="#D6D9F0" shape=inputoutput style=filled]
+	N4 [label="Personalized Learning Paths" color="#9FA9E1" fillcolor="#D6D9F0" shape=document style=filled]
+	N5 [label="AI in Online Education" color="#FFC085" fillcolor="#FFDAB9" shape=rectangle style=filled]
+	N6 [label="Blended Learning Models" color="#FFC085" fillcolor="#FFDAB9" shape=rectangle style=filled]
+	N7 [label="Bootcamp Development" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N8 [label="Digital Badges" color="#9FA9E1" fillcolor="#D6D9F0" shape=action style=filled]
+	N9 [label="Virtual Field Trips" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N10 [label="Course Design" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N11 [label="Accreditation Management" color="#FFC085" fillcolor="#FFDAB9" shape=hexagon style=filled]
+	N12 [label="Online Tutoring" color="#F44336" fillcolor="#FFCDD2" shape=rectangle style=filled]
+	N13 [label="Gamification in Education" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N14 [label="Asynchronous Learning" color="#9FA9E1" fillcolor="#D6D9F0" shape=document style=filled]
+	S0 [label="" color="#F44336" fillcolor="#FFCDD2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#F44336" fillcolor="#FFCDD2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Student Engagement Strategies {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Student Engagement Strategies"
+		nest0_0 [label="Peer_to_Peer Learning" color="#F44336" fillcolor="#FFCDD2" shape=action style=filled]
+		nest0_1 [label="Synchronous Learning" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	}
+	subgraph cluster_Course Evaluation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Course Evaluation"
+		nest1_0 [label="Micro_credential Programs" color="#F44336" fillcolor="#FFCDD2" shape=predefinedprocess style=filled]
+		nest1_1 [label="Curriculum Development" color="#FFC085" fillcolor="#FFDAB9" shape=rect style=filled]
+		nest1_2 [label="Test Preparation Courses" color="#F44336" fillcolor="#FFCDD2" shape=document style=filled]
+		nest1_3 [label="Technical Support for Students" color="#FFC085" fillcolor="#FFDAB9" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N10 -> nest0_0 [color="#F44336" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N1 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FFC085" penwidth=1.5 style=solid label="manages enrollments" dir=forward]
+	nest1_2 -> nest1_3 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N7 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S0 [color="#F44336" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N10 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#F44336" penwidth=1.5 style=solid dir=forward]
+	M1 -> N4 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_235.txt b/test/diagrams/graph_hard/diagrams_235.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e3cce9bb314b93b2f4591c85b90f50a6f9371769
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_235.txt
@@ -0,0 +1,29 @@
+<AI in Online Education, connectedTo, Blended Learning Models>
+<Accreditation Management, connectedTo, Online Tutoring>
+<Blended Learning Models, connectedTo, Bootcamp Development>
+<Bootcamp Development, connectedTo, Digital Badges>
+<Certification Issuance, connectedTo, Personalized Learning Paths>
+<Course Design, connectedTo, Accreditation Management>
+<Course Design, connectedTo, Gamification in Education>
+<Course Design, connectedTo, Micro_credential Programs>
+<Course Design, connectedTo, Online Tutoring>
+<Course Design, connectedTo, Peer_to_Peer Learning>
+<Curriculum Development, manages enrollments, Test Preparation Courses>
+<Digital Badges, connectedTo, Accreditation Management>
+<Digital Badges, connectedTo, Asynchronous Learning>
+<Digital Badges, connectedTo, Course Design>
+<Digital Badges, connectedTo, Virtual Field Trips>
+<Gamification in Education, connectedTo, Asynchronous Learning>
+<Learning Analytics, connectedTo, Open Educational Resources Integration>
+<Learning Analytics, connectedTo, Personalized Learning Paths>
+<Learning Management System Administration, connectedTo, Learning Analytics>
+<Learning Management System Administration, connectedTo, Personalized Learning Paths>
+<Micro_credential Programs, connectedTo, Curriculum Development>
+<Online Tutoring, connectedTo, Gamification in Education>
+<Open Educational Resources Integration, connectedTo, Certification Issuance>
+<Peer_to_Peer Learning, connectedTo, Synchronous Learning>
+<Personalized Learning Paths, connectedTo, AI in Online Education>
+<Synchronous Learning, connectedTo, Learning Analytics>
+<Technical Support for Students, connectedTo, Bootcamp Development>
+<Test Preparation Courses, connectedTo, Technical Support for Students>
+<Virtual Field Trips, connectedTo, Course Design>
diff --git a/test/diagrams/graph_hard/diagrams_236.dot b/test/diagrams/graph_hard/diagrams_236.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e505901a673616a5cf62759b73afdd9bafa190c2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_236.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=BT
+	N0 [label="Asynchronous Learning" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N1 [label="Parent or Guardian Communication" color="#388E3C" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N2 [label="Student Progress Tracking" color="#FF5722" fillcolor="#FFCCBC" shape=inputoutput style=filled]
+	N3 [label="AI in Online Education" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N4 [label="Open Educational Resources Integration" color="#388E3C" fillcolor="#F1F8E9" shape=rect style=filled]
+	N5 [label="Discussion Forum Moderation" color="#FF5722" fillcolor="#FFCCBC" shape=preparation style=filled]
+	N6 [label="Digital Badges" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+	N7 [label="Enrollment and Retention Strategies" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N8 [label="Student Engagement Strategies" color="#80DDEA" fillcolor="#D3F7F9" shape=multipledocuments style=filled]
+	N9 [label="Interactive Learning Activities" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N10 [label="Learning Management System Administration" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	S0 [label="" color="#FF5722" fillcolor="#FFCCBC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FF5722" fillcolor="#FFCCBC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Language Learning Platforms {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Language Learning Platforms"
+		nest0_0 [label="Accreditation Management" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+		nest0_1 [label="Course Evaluation" color="#80DDEA" fillcolor="#D3F7F9" shape=rect style=filled]
+	}
+	subgraph cluster_Competency_Based Education {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Competency_Based Education"
+		nest1_0 [label="Course Design" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+		nest1_1 [label="Virtual Field Trips" color="#80DDEA" fillcolor="#D3F7F9" shape=preparation style=filled]
+		nest1_2 [label="Synchronous Learning" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+	}
+	N0 -> N1 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed label="uses machine learning" dir=forward]
+	nest0_1 -> N9 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest1_0 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N7 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N2 -> S0 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N4 [color="#388E3C" penwidth=1.5 style=solid label="supports competency_based" dir=forward]
+	S0 -> N5 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N6 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> M1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N10 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=solid label="develops platforms" dir=forward]
+	N6 -> M2 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N8 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_237.txt b/test/diagrams/graph_hard/diagrams_237.txt
new file mode 100644
index 0000000000000000000000000000000000000000..81422b2751d7a21a46afb2133116a9e6e1c21456
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_237.txt
@@ -0,0 +1,23 @@
+<Accessibility Features, uses adaptive systems, Discussion Forum Moderation>
+<Bootcamp Development, secures platforms, Digital Badges>
+<Certification Issuance, administers assessments, Curriculum Development>
+<Course Design, connectedTo, Language Learning Platforms>
+<Curriculum Development, connectedTo, Blended Learning Models>
+<Digital Badges, connectedTo, Open Educational Resources Integration>
+<Digital Badges, connectedTo, Peer_to_Peer Learning>
+<Discussion Forum Moderation, connectedTo, Instructor Training>
+<Instructor Training, provides feedback, Virtual Classroom Facilitation>
+<Language Learning Platforms, connectedTo, Blended Learning Models>
+<Open Educational Resources Integration, connectedTo, Accessibility Features>
+<Peer_to_Peer Learning, connectedTo, Blended Learning Models>
+<Peer_to_Peer Learning, connectedTo, Curriculum Development>
+<Peer_to_Peer Learning, facilitates discussions, Certification Issuance>
+<Student Progress Tracking, connectedTo, Certification Issuance>
+<Student Progress Tracking, connectedTo, Curriculum Development>
+<Student Progress Tracking, connectedTo, Discussion Forum Moderation>
+<Student Progress Tracking, connectedTo, Peer_to_Peer Learning>
+<Virtual Classroom Facilitation, connectedTo, Blended Learning Models>
+<Virtual Classroom Facilitation, connectedTo, Bootcamp Development>
+<Virtual Classroom Facilitation, connectedTo, Certification Issuance>
+<Virtual Classroom Facilitation, connectedTo, Course Design>
+<Virtual Classroom Facilitation, connectedTo, Digital Badges>
diff --git a/test/diagrams/graph_hard/diagrams_238.dot b/test/diagrams/graph_hard/diagrams_238.dot
new file mode 100644
index 0000000000000000000000000000000000000000..91f559400359ff2a987d7ba36874db98016be2b1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_238.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=BT
+	N0 [label="Research on MOOC Effectiveness" color="#EAEFA5" fillcolor="#FDFCEB" shape=document style=filled]
+	N1 [label="Global Accessibility Features" color="#82DAFF" fillcolor="#C8EDFF" shape=multipledocuments style=filled]
+	N2 [label="Certificate of Completion Issuance" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N3 [label="Subscription Models" color="#82DAFF" fillcolor="#C8EDFF" shape=inputoutput style=filled]
+	N4 [label="Industry Collaboration for Content" color="#EAEFA5" fillcolor="#FDFCEB" shape=vnode_shape style=filled]
+	N5 [label="Continuous Course Improvement" color="#82DAFF" fillcolor="#C8EDFF" shape=preparation style=filled]
+	N6 [label="Engagement Metrics Tracking" color="#CD8FF2" fillcolor="#ECCFF5" shape=vnode_shape style=filled]
+	N7 [label="Financial Aid for Learners" color="#EAEFA5" fillcolor="#FDFCEB" shape=rectangle style=filled]
+	N8 [label="Discussion Forum Management" color="#EAEFA5" fillcolor="#FDFCEB" shape=multipledocuments style=filled]
+	N9 [label="Course Audit Options" color="#82DAFF" fillcolor="#C8EDFF" shape=parallelogram style=filled]
+	N10 [label="Self_Paced Learning Tracks" color="#82DAFF" fillcolor="#C8EDFF" shape=rect style=filled]
+	N11 [label="Learner Support" color="#82DAFF" fillcolor="#C8EDFF" shape=rect style=filled]
+	S0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Completion Rate Optimization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Completion Rate Optimization"
+		nest0_0 [label="Specialization or Professional Certificate Programs" color="#EAEFA5" fillcolor="#FDFCEB" shape=diamond style=filled]
+		nest0_1 [label="Marketing to Global Audience" color="#EAEFA5" fillcolor="#FDFCEB" shape=rectangle style=filled]
+		nest0_2 [label="Content Licensing" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Instructor Recruitment for MOOCs {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Instructor Recruitment for MOOCs"
+		nest1_0 [label="Course Retirement Planning" color="#EAEFA5" fillcolor="#FDFCEB" shape=preparation style=filled]
+		nest1_1 [label="Platform Selection" color="#EAEFA5" fillcolor="#FDFCEB" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed label="provides readings" dir=forward]
+	N10 -> N11 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#82DAFF" penwidth=1.5 style=solid label="manages instructors" dir=forward]
+	nest0_1 -> nest0_2 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N9 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid label="tracks completion" dir=forward]
+	N9 -> nest1_0 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S0 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S2 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N5 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> M2 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N9 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_238.txt b/test/diagrams/graph_hard/diagrams_238.txt
new file mode 100644
index 0000000000000000000000000000000000000000..62487b92d5d22937ded1800cdf3063ce8c7102ea
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_238.txt
@@ -0,0 +1,27 @@
+<Certificate of Completion Issuance, connectedTo, Subscription Models>
+<Content Licensing, connectedTo, Course Audit Options>
+<Continuous Course Improvement, connectedTo, Discussion Forum Management>
+<Continuous Course Improvement, connectedTo, Engagement Metrics Tracking>
+<Course Audit Options, connectedTo, Course Retirement Planning>
+<Course Audit Options, provides readings, Self_Paced Learning Tracks>
+<Course Retirement Planning, tracks completion, Platform Selection>
+<Discussion Forum Management, connectedTo, Course Audit Options>
+<Discussion Forum Management, connectedTo, Learner Support>
+<Discussion Forum Management, connectedTo, Self_Paced Learning Tracks>
+<Engagement Metrics Tracking, connectedTo, Discussion Forum Management>
+<Engagement Metrics Tracking, connectedTo, Financial Aid for Learners>
+<Engagement Metrics Tracking, connectedTo, Specialization or Professional Certificate Programs>
+<Financial Aid for Learners, connectedTo, Course Audit Options>
+<Financial Aid for Learners, connectedTo, Discussion Forum Management>
+<Global Accessibility Features, connectedTo, Certificate of Completion Issuance>
+<Global Accessibility Features, connectedTo, Course Audit Options>
+<Industry Collaboration for Content, connectedTo, Continuous Course Improvement>
+<Industry Collaboration for Content, connectedTo, Discussion Forum Management>
+<Marketing to Global Audience, connectedTo, Content Licensing>
+<Platform Selection, connectedTo, Certificate of Completion Issuance>
+<Research on MOOC Effectiveness, connectedTo, Continuous Course Improvement>
+<Research on MOOC Effectiveness, connectedTo, Financial Aid for Learners>
+<Research on MOOC Effectiveness, connectedTo, Global Accessibility Features>
+<Self_Paced Learning Tracks, connectedTo, Learner Support>
+<Specialization or Professional Certificate Programs, manages instructors, Marketing to Global Audience>
+<Subscription Models, connectedTo, Industry Collaboration for Content>
diff --git a/test/diagrams/graph_hard/diagrams_239.dot b/test/diagrams/graph_hard/diagrams_239.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e40b07aacbc5bef1fd7d6206fcab2f17bc0fd619
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_239.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=LR
+	N0 [label="Assessment Creation" color="#00BCD4" fillcolor="#E0F7FA" shape=database style=filled]
+	N1 [label="Completion Rate Optimization" color="#FFF9AE" fillcolor="#FFFCE6" shape=preparation style=filled]
+	N2 [label="Global Accessibility Features" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N3 [label="Skill_Based Learning Outcomes" color="#00BCD4" fillcolor="#E0F7FA" shape=inputoutput style=filled]
+	N4 [label="Learner Feedback Analysis" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N5 [label="Micro_credential Stacking" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N6 [label="Specialization or Professional Certificate Programs" color="#00BCD4" fillcolor="#E0F7FA" shape=action style=filled]
+	N7 [label="Technical Infrastructure for Scale" color="#8C9EFF" fillcolor="#D3D7EB" shape=preparation style=filled]
+	N8 [label="Content Licensing" color="#00BCD4" fillcolor="#E0F7FA" shape=multipledocuments style=filled]
+	N9 [label="Engagement Metrics Tracking" color="#FFF9AE" fillcolor="#FFFCE6" shape=action style=filled]
+	N10 [label="Verified Track Management" color="#8C9EFF" fillcolor="#D3D7EB" shape=document style=filled]
+	N11 [label="Career Pathway Mapping" color="#FFF9AE" fillcolor="#FFFCE6" shape=rect style=filled]
+	S0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Forum Moderation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Forum Moderation"
+		nest0_0 [label="Industry Collaboration for Content" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+		nest0_1 [label="University Partnerships" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	}
+	subgraph cluster_Financial Aid for Learners {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Financial Aid for Learners"
+		nest1_0 [label="Continuous Course Improvement" color="#FFF9AE" fillcolor="#FFFCE6" shape=preparation style=filled]
+		nest1_1 [label="Course Promotion" color="#00BCD4" fillcolor="#E0F7FA" shape=action style=filled]
+		nest1_2 [label="Corporate Training Solutions" color="#8C9EFF" fillcolor="#D3D7EB" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest0_0 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest1_0 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> S1 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N1 -> S2 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N5 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	S2 -> N3 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S2 -> N4 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	M1 -> N4 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_24.dot b/test/diagrams/graph_hard/diagrams_24.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a42cd5bfc01afe520704ca29048233ce54f5b7ad
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_24.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=RL
+	N0 [label="Discovery Process" color="#CFCFCF" fillcolor="#F6F6F6" shape=multipledocuments style=filled]
+	N1 [label="Cross_Examination" color="#73C6BC" fillcolor="#D0EFEE" shape=preparation style=filled]
+	N2 [label="Bankruptcy Filing" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N3 [label="Verdict Announcement" color="#CFCFCF" fillcolor="#F6F6F6" shape=multipledocuments style=filled]
+	N4 [label="Legal Research" color="#CFCFCF" fillcolor="#F6F6F6" shape=predefinedprocess style=filled]
+	N5 [label="Pro Bono Work" color="#CFCFCF" fillcolor="#F6F6F6" shape=database style=filled]
+	N6 [label="Notarization" color="#A1887F" fillcolor="#EFEBE9" shape=diamond style=filled]
+	N7 [label="Case Filing" color="#A1887F" fillcolor="#EFEBE9" shape=preparation style=filled]
+	N8 [label="Due Diligence" color="#CFCFCF" fillcolor="#F6F6F6" shape=multipledocuments style=filled]
+	N9 [label="Divorce Proceedings" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N10 [label="Closing Argument" color="#73C6BC" fillcolor="#D0EFEE" shape=preparation style=filled]
+	N11 [label="Sentencing" color="#CFCFCF" fillcolor="#F6F6F6" shape=multipledocuments style=filled]
+	N12 [label="Trial Session" color="#A1887F" fillcolor="#EFEBE9" shape=diamond style=filled]
+	N13 [label="Plea Bargain" color="#CFCFCF" fillcolor="#F6F6F6" shape=multipledocuments style=filled]
+	N14 [label="Arbitration Session" color="#A1887F" fillcolor="#EFEBE9" shape=predefinedprocess style=filled]
+	N15 [label="Judgment Writing" color="#CFCFCF" fillcolor="#F6F6F6" shape=inputoutput style=filled]
+	N16 [label="Estate Planning" color="#CFCFCF" fillcolor="#F6F6F6" shape=multipledocuments style=filled]
+	N17 [label="Copyright Infringement" color="#CFCFCF" fillcolor="#F6F6F6" shape=action style=filled]
+	S0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A1887F" fillcolor="#EFEBE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Bail Hearing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Bail Hearing"
+		nest0_0 [label="Legal Consultation" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+		nest0_1 [label="Evidence Collection" color="#73C6BC" fillcolor="#D0EFEE" shape=preparation style=filled]
+	}
+	subgraph cluster_Legal Aid Assistance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Legal Aid Assistance"
+		nest1_0 [label="Settlement Negotiation" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+		nest1_1 [label="Trademark Registration" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N15 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest1_0 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N5 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N7 -> M0 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N8 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_24.txt b/test/diagrams/graph_hard/diagrams_24.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e709e36da2a7f5a5ed4ba24afeed56b1ff887d1e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_24.txt
@@ -0,0 +1,36 @@
+<Arbitration Session, connectedTo, Judgment Writing>
+<Bankruptcy Filing, connectedTo, Arbitration Session>
+<Bankruptcy Filing, connectedTo, Case Filing>
+<Bankruptcy Filing, connectedTo, Divorce Proceedings>
+<Bankruptcy Filing, connectedTo, Legal Research>
+<Bankruptcy Filing, connectedTo, Verdict Announcement>
+<Case Filing, connectedTo, Divorce Proceedings>
+<Case Filing, connectedTo, Due Diligence>
+<Case Filing, connectedTo, Settlement Negotiation>
+<Closing Argument, connectedTo, Sentencing>
+<Cross_Examination, connectedTo, Bankruptcy Filing>
+<Cross_Examination, connectedTo, Due Diligence>
+<Cross_Examination, connectedTo, Pro Bono Work>
+<Cross_Examination, connectedTo, Sentencing>
+<Discovery Process, connectedTo, Cross_Examination>
+<Discovery Process, connectedTo, Due Diligence>
+<Divorce Proceedings, connectedTo, Closing Argument>
+<Due Diligence, connectedTo, Divorce Proceedings>
+<Estate Planning, connectedTo, Copyright Infringement>
+<Evidence Collection, connectedTo, Cross_Examination>
+<Judgment Writing, connectedTo, Estate Planning>
+<Judgment Writing, connectedTo, Legal Consultation>
+<Legal Consultation, connectedTo, Evidence Collection>
+<Legal Research, connectedTo, Due Diligence>
+<Legal Research, connectedTo, Pro Bono Work>
+<Notarization, connectedTo, Case Filing>
+<Notarization, connectedTo, Divorce Proceedings>
+<Notarization, connectedTo, Due Diligence>
+<Plea Bargain, connectedTo, Arbitration Session>
+<Pro Bono Work, connectedTo, Notarization>
+<Sentencing, connectedTo, Trial Session>
+<Settlement Negotiation, connectedTo, Trademark Registration>
+<Trademark Registration, connectedTo, Pro Bono Work>
+<Trial Session, connectedTo, Plea Bargain>
+<Verdict Announcement, connectedTo, Divorce Proceedings>
+<Verdict Announcement, connectedTo, Legal Research>
diff --git a/test/diagrams/graph_hard/diagrams_240.dot b/test/diagrams/graph_hard/diagrams_240.dot
new file mode 100644
index 0000000000000000000000000000000000000000..241b9f250a10e7f0d9cf3135dc883be8f79e6b63
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_240.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=LR
+	N0 [label="Assessment Creation" color="#DCE775" fillcolor="#F9FBE7" shape=diamond style=filled]
+	N1 [label="Certificate of Completion Issuance" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N2 [label="Specialization or Professional Certificate Programs" color="#4FC3F7" fillcolor="#E1F5FE" shape=hexagon style=filled]
+	N3 [label="Video Lecture Production" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N4 [label="Technical Infrastructure for Scale" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N5 [label="Industry Collaboration for Content" color="#4FC3F7" fillcolor="#E1F5FE" shape=multipledocuments style=filled]
+	N6 [label="Learner Feedback Analysis" color="#4FC3F7" fillcolor="#E1F5FE" shape=document style=filled]
+	N7 [label="Peer Grading Implementation" color="#795548" fillcolor="#D7CCC8" shape=database style=filled]
+	N8 [label="Course Promotion" color="#795548" fillcolor="#D7CCC8" shape=inputoutput style=filled]
+	N9 [label="Mobile Learning Experience" color="#795548" fillcolor="#D7CCC8" shape=action style=filled]
+	N10 [label="Learner Analytics" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N11 [label="Course Audit Options" color="#4FC3F7" fillcolor="#E1F5FE" shape=database style=filled]
+	S1 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Micro_credential Stacking {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Micro_credential Stacking"
+		nest0_0 [label="Learner Support" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+		nest0_1 [label="Corporate Training Solutions" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+		nest0_2 [label="Marketing to Global Audience" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+		nest0_3 [label="Continuous Course Improvement" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	}
+	subgraph cluster_University Partnerships {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="University Partnerships"
+		nest1_0 [label="Instructor_Led Sessions" color="#795548" fillcolor="#D7CCC8" shape=vnode_shape style=filled]
+		nest1_1 [label="Verified Track Management" color="#4FC3F7" fillcolor="#E1F5FE" shape=inputoutput style=filled]
+		nest1_2 [label="Engagement Metrics Tracking" color="#DCE775" fillcolor="#F9FBE7" shape=database style=filled]
+		nest1_3 [label="Discussion Forum Management" color="#795548" fillcolor="#D7CCC8" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest0_0 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N10 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N7 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N10 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N5 -> M2 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M2 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_240.txt b/test/diagrams/graph_hard/diagrams_240.txt
new file mode 100644
index 0000000000000000000000000000000000000000..97c36dd785d73d60076008b5a2a2c9e40ebc3267
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_240.txt
@@ -0,0 +1,31 @@
+<Assessment Creation, connectedTo, Certificate of Completion Issuance>
+<Assessment Creation, connectedTo, Course Promotion>
+<Assessment Creation, connectedTo, Industry Collaboration for Content>
+<Assessment Creation, connectedTo, Mobile Learning Experience>
+<Certificate of Completion Issuance, connectedTo, Mobile Learning Experience>
+<Certificate of Completion Issuance, connectedTo, Specialization or Professional Certificate Programs>
+<Continuous Course Improvement, connectedTo, Learner Analytics>
+<Corporate Training Solutions, connectedTo, Marketing to Global Audience>
+<Course Promotion, connectedTo, Mobile Learning Experience>
+<Discussion Forum Management, connectedTo, Peer Grading Implementation>
+<Engagement Metrics Tracking, connectedTo, Discussion Forum Management>
+<Industry Collaboration for Content, connectedTo, Learner Feedback Analysis>
+<Industry Collaboration for Content, connectedTo, Mobile Learning Experience>
+<Instructor_Led Sessions, connectedTo, Verified Track Management>
+<Learner Analytics, connectedTo, Course Audit Options>
+<Learner Analytics, connectedTo, Learner Support>
+<Learner Feedback Analysis, connectedTo, Learner Analytics>
+<Learner Feedback Analysis, connectedTo, Peer Grading Implementation>
+<Learner Support, connectedTo, Corporate Training Solutions>
+<Marketing to Global Audience, connectedTo, Continuous Course Improvement>
+<Mobile Learning Experience, connectedTo, Instructor_Led Sessions>
+<Mobile Learning Experience, connectedTo, Learner Analytics>
+<Peer Grading Implementation, connectedTo, Course Promotion>
+<Peer Grading Implementation, connectedTo, Mobile Learning Experience>
+<Specialization or Professional Certificate Programs, connectedTo, Learner Analytics>
+<Specialization or Professional Certificate Programs, connectedTo, Mobile Learning Experience>
+<Specialization or Professional Certificate Programs, connectedTo, Video Lecture Production>
+<Technical Infrastructure for Scale, connectedTo, Industry Collaboration for Content>
+<Verified Track Management, connectedTo, Engagement Metrics Tracking>
+<Video Lecture Production, connectedTo, Learner Analytics>
+<Video Lecture Production, connectedTo, Technical Infrastructure for Scale>
diff --git a/test/diagrams/graph_hard/diagrams_241.dot b/test/diagrams/graph_hard/diagrams_241.dot
new file mode 100644
index 0000000000000000000000000000000000000000..191144053caa0a7d458a324bd335a14fdb040a53
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_241.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=RL
+	N0 [label="Graduate School Exam Prep" color="#C2B2F0" fillcolor="#EFE6FF" shape=predefinedprocess style=filled]
+	N1 [label="Curriculum Development" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N2 [label="Parent or Guardian Updates" color="#C2B2F0" fillcolor="#EFE6FF" shape=rect style=filled]
+	N3 [label="Reading Comprehension Drills" color="#CB9BE1" fillcolor="#F2E6F5" shape=predefinedprocess style=filled]
+	N4 [label="Diagnostic Assessment" color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+	N5 [label="Memory Techniques Training" color="#C2B2F0" fillcolor="#EFE6FF" shape=preparation style=filled]
+	N6 [label="Study Environment Optimization" color="#CB9BE1" fillcolor="#F2E6F5" shape=database style=filled]
+	N7 [label="Subject Matter Review" color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+	N8 [label="Practice Test Creation" color="#C2B2F0" fillcolor="#EFE6FF" shape=diamond style=filled]
+	N9 [label="Personalized Study Plans" color="#CB9BE1" fillcolor="#F2E6F5" shape=action style=filled]
+	N10 [label="Score Analysis" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N11 [label="Interactive Exercises" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	S0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Math Skills Refresher {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Math Skills Refresher"
+		nest0_0 [label="Flashcard Creation" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+		nest0_1 [label="AI_Powered Tutoring" color="#A188D0" fillcolor="#DACBE3" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Virtual Proctoring {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Virtual Proctoring"
+		nest1_0 [label="Stress Management for Exams" color="#A188D0" fillcolor="#DACBE3" shape=action style=filled]
+		nest1_1 [label="College Entrance Exam Prep" color="#C2B2F0" fillcolor="#EFE6FF" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest0_0 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest1_0 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N3 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S0 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#CB9BE1" penwidth=1.5 style=solid label="practices" dir=forward]
+	S0 -> N11 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=solid label="provides" dir=forward]
+	M0 -> N3 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> M1 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N10 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> M2 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	M2 -> N11 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_241.txt b/test/diagrams/graph_hard/diagrams_241.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fc0d7de1429755d33bef67c6f711784895782819
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_241.txt
@@ -0,0 +1,28 @@
+<AI_Powered Tutoring, connectedTo, Reading Comprehension Drills>
+<College Entrance Exam Prep, connectedTo, Reading Comprehension Drills>
+<Curriculum Development, connectedTo, Parent or Guardian Updates>
+<Curriculum Development, connectedTo, Reading Comprehension Drills>
+<Diagnostic Assessment, connectedTo, Memory Techniques Training>
+<Diagnostic Assessment, connectedTo, Score Analysis>
+<Flashcard Creation, connectedTo, AI_Powered Tutoring>
+<Graduate School Exam Prep, connectedTo, Curriculum Development>
+<Graduate School Exam Prep, provides, Reading Comprehension Drills>
+<Memory Techniques Training, connectedTo, Interactive Exercises>
+<Memory Techniques Training, connectedTo, Score Analysis>
+<Memory Techniques Training, connectedTo, Study Environment Optimization>
+<Memory Techniques Training, practices, Subject Matter Review>
+<Parent or Guardian Updates, connectedTo, Practice Test Creation>
+<Parent or Guardian Updates, connectedTo, Reading Comprehension Drills>
+<Parent or Guardian Updates, connectedTo, Score Analysis>
+<Personalized Study Plans, connectedTo, Flashcard Creation>
+<Personalized Study Plans, connectedTo, Score Analysis>
+<Practice Test Creation, connectedTo, Interactive Exercises>
+<Practice Test Creation, connectedTo, Personalized Study Plans>
+<Practice Test Creation, connectedTo, Score Analysis>
+<Reading Comprehension Drills, connectedTo, Diagnostic Assessment>
+<Reading Comprehension Drills, connectedTo, Interactive Exercises>
+<Score Analysis, connectedTo, Interactive Exercises>
+<Stress Management for Exams, connectedTo, College Entrance Exam Prep>
+<Study Environment Optimization, connectedTo, Subject Matter Review>
+<Subject Matter Review, connectedTo, Practice Test Creation>
+<Subject Matter Review, connectedTo, Stress Management for Exams>
diff --git a/test/diagrams/graph_hard/diagrams_242.dot b/test/diagrams/graph_hard/diagrams_242.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1fa914a6105d959a3ff1a0072f0403b13afc199a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_242.dot
@@ -0,0 +1,83 @@
+digraph {
+	rankdir=BT
+	N0 [label="Subject Matter Review" color="#73C6BC" fillcolor="#D0EFEE" shape=inputoutput style=filled]
+	N1 [label="Student Progress Tracking" color="#73C6BC" fillcolor="#D0EFEE" shape=diamond style=filled]
+	N2 [label="Parent or Guardian Updates" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N3 [label="Study Material Design" color="#AED581" fillcolor="#F0F4C3" shape=rectangle style=filled]
+	N4 [label="AI_Powered Tutoring" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N5 [label="Study Group Facilitation" color="#7E57C2" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N6 [label="Online Course Delivery" color="#7E57C2" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N7 [label="Exam Day Tips" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+	N8 [label="Professional Licensure Exam Prep" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+	N9 [label="Adaptive Learning Algorithms" color="#73C6BC" fillcolor="#D0EFEE" shape=parallelogram style=filled]
+	N10 [label="Memory Techniques Training" color="#73C6BC" fillcolor="#D0EFEE" shape=rectangle style=filled]
+	N11 [label="Performance Feedback" color="#AED581" fillcolor="#F0F4C3" shape=action style=filled]
+	N12 [label="Motivation Coaching" color="#7E57C2" fillcolor="#EDE7F6" shape=diamond style=filled]
+	N13 [label="Performance Prediction Models" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+	N14 [label="Certification Exam Prep" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N15 [label="Diagnostic Assessment" color="#73C6BC" fillcolor="#D0EFEE" shape=multipledocuments style=filled]
+	S0 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Test_Taking Strategies {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Test_Taking Strategies"
+		nest0_0 [label="Personalized Study Plans" color="#73C6BC" fillcolor="#D0EFEE" shape=multipledocuments style=filled]
+		nest0_1 [label="Stress Management for Exams" color="#73C6BC" fillcolor="#D0EFEE" shape=vnode_shape style=filled]
+		nest0_2 [label="Score Analysis" color="#73C6BC" fillcolor="#D0EFEE" shape=preparation style=filled]
+		nest0_3 [label="Writing Skills Improvement" color="#AED581" fillcolor="#F0F4C3" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Virtual Proctoring {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Virtual Proctoring"
+		nest1_0 [label="Reading Comprehension Drills" color="#AED581" fillcolor="#F0F4C3" shape=document style=filled]
+		nest1_1 [label="Question Bank Management" color="#73C6BC" fillcolor="#D0EFEE" shape=predefinedprocess style=filled]
+		nest1_2 [label="Time Management Coaching" color="#7E57C2" fillcolor="#EDE7F6" shape=rectangle style=filled]
+		nest1_3 [label="Curriculum Development" color="#73C6BC" fillcolor="#D0EFEE" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid label="diagnoses" dir=forward]
+	N8 -> N9 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N13 -> nest0_0 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N2 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N12 -> S0 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S1 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#7E57C2" penwidth=1.5 style=dashed label="revises" dir=forward]
+	S1 -> N11 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N4 -> S2 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N8 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_242.txt b/test/diagrams/graph_hard/diagrams_242.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0b59f7c4c6904d2b75385e4143396f5cf27e3061
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_242.txt
@@ -0,0 +1,35 @@
+<AI_Powered Tutoring, connectedTo, Exam Day Tips>
+<AI_Powered Tutoring, connectedTo, Online Course Delivery>
+<AI_Powered Tutoring, connectedTo, Performance Feedback>
+<AI_Powered Tutoring, connectedTo, Professional Licensure Exam Prep>
+<AI_Powered Tutoring, connectedTo, Study Group Facilitation>
+<AI_Powered Tutoring, revises, Memory Techniques Training>
+<Adaptive Learning Algorithms, connectedTo, Memory Techniques Training>
+<Certification Exam Prep, connectedTo, Diagnostic Assessment>
+<Curriculum Development, connectedTo, Parent or Guardian Updates>
+<Exam Day Tips, diagnoses, Professional Licensure Exam Prep>
+<Memory Techniques Training, connectedTo, Performance Feedback>
+<Motivation Coaching, connectedTo, Certification Exam Prep>
+<Motivation Coaching, connectedTo, Diagnostic Assessment>
+<Motivation Coaching, connectedTo, Performance Prediction Models>
+<Online Course Delivery, connectedTo, Exam Day Tips>
+<Parent or Guardian Updates, connectedTo, Reading Comprehension Drills>
+<Parent or Guardian Updates, connectedTo, Study Material Design>
+<Performance Feedback, connectedTo, Motivation Coaching>
+<Performance Prediction Models, connectedTo, Certification Exam Prep>
+<Performance Prediction Models, connectedTo, Personalized Study Plans>
+<Personalized Study Plans, connectedTo, Stress Management for Exams>
+<Professional Licensure Exam Prep, connectedTo, Adaptive Learning Algorithms>
+<Question Bank Management, connectedTo, Time Management Coaching>
+<Reading Comprehension Drills, connectedTo, Question Bank Management>
+<Score Analysis, connectedTo, Writing Skills Improvement>
+<Stress Management for Exams, connectedTo, Score Analysis>
+<Student Progress Tracking, connectedTo, Exam Day Tips>
+<Student Progress Tracking, connectedTo, Parent or Guardian Updates>
+<Study Group Facilitation, connectedTo, Online Course Delivery>
+<Study Group Facilitation, connectedTo, Professional Licensure Exam Prep>
+<Study Material Design, connectedTo, AI_Powered Tutoring>
+<Subject Matter Review, connectedTo, Professional Licensure Exam Prep>
+<Subject Matter Review, connectedTo, Student Progress Tracking>
+<Time Management Coaching, connectedTo, Curriculum Development>
+<Writing Skills Improvement, connectedTo, Performance Feedback>
diff --git a/test/diagrams/graph_hard/diagrams_243.dot b/test/diagrams/graph_hard/diagrams_243.dot
new file mode 100644
index 0000000000000000000000000000000000000000..063edafccb4f000f398aef37c8c3c5a803c91b63
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_243.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=RL
+	N0 [label="Time Management Coaching" color="#4285F4" fillcolor="#D0E0F8" shape=rectangle style=filled]
+	N1 [label="History Topic Mastery" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+	N2 [label="Performance Prediction Models" color="#4DD0E1" fillcolor="#C9F0F0" shape=action style=filled]
+	N3 [label="Personalized Study Plans" color="#4DD0E1" fillcolor="#C9F0F0" shape=rect style=filled]
+	N4 [label="Flashcard Creation" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+	N5 [label="Test_Taking Strategies" color="#4285F4" fillcolor="#D0E0F8" shape=multipledocuments style=filled]
+	N6 [label="Math Skills Refresher" color="#4285F4" fillcolor="#D0E0F8" shape=rectangle style=filled]
+	N7 [label="Mock Exam Administration" color="#4285F4" fillcolor="#D0E0F8" shape=rectangle style=filled]
+	N8 [label="Interactive Exercises" color="#4DD0E1" fillcolor="#C9F0F0" shape=rectangle style=filled]
+	N9 [label="Question Bank Management" color="#4285F4" fillcolor="#D0E0F8" shape=action style=filled]
+	N10 [label="Student Progress Tracking" color="#388E3C" fillcolor="#F1F8E9" shape=rect style=filled]
+	N11 [label="Reading Comprehension Drills" color="#4285F4" fillcolor="#D0E0F8" shape=inputoutput style=filled]
+	N12 [label="Critical Thinking Development" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+	S0 [label="" color="#4285F4" fillcolor="#D0E0F8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4285F4" fillcolor="#D0E0F8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#4DD0E1" fillcolor="#C9F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#4285F4" fillcolor="#D0E0F8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#4DD0E1" fillcolor="#C9F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Subject Matter Review {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Subject Matter Review"
+		nest0_0 [label="Virtual Proctoring" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+		nest0_1 [label="AI_Powered Tutoring" color="#388E3C" fillcolor="#F1F8E9" shape=document style=filled]
+		nest0_2 [label="Diagnostic Assessment" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	}
+	subgraph cluster_Motivation Coaching {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Motivation Coaching"
+		nest1_0 [label="Writing Skills Improvement" color="#4DD0E1" fillcolor="#C9F0F0" shape=inputoutput style=filled]
+		nest1_1 [label="Professional Licensure Exam Prep" color="#4DD0E1" fillcolor="#C9F0F0" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#4DD0E1" penwidth=1.5 style=dashed label="personalizes" dir=forward]
+	N3 -> N4 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#4DD0E1" penwidth=1.5 style=solid label="supports" dir=forward]
+	N10 -> N11 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> S0 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	S0 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N7 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	M0 -> N3 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#4285F4" penwidth=1.5 style=solid label="tracks" dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_243.txt b/test/diagrams/graph_hard/diagrams_243.txt
new file mode 100644
index 0000000000000000000000000000000000000000..14d64481ccd8a4e9ad4fe2b85172c2e766bc1a25
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_243.txt
@@ -0,0 +1,31 @@
+<AI_Powered Tutoring, connectedTo, Diagnostic Assessment>
+<Diagnostic Assessment, connectedTo, Math Skills Refresher>
+<Flashcard Creation, connectedTo, Test_Taking Strategies>
+<History Topic Mastery, connectedTo, Performance Prediction Models>
+<History Topic Mastery, connectedTo, Personalized Study Plans>
+<History Topic Mastery, connectedTo, Writing Skills Improvement>
+<History Topic Mastery, tracks, Flashcard Creation>
+<Interactive Exercises, connectedTo, Question Bank Management>
+<Math Skills Refresher, connectedTo, Mock Exam Administration>
+<Mock Exam Administration, connectedTo, Interactive Exercises>
+<Mock Exam Administration, connectedTo, Question Bank Management>
+<Mock Exam Administration, connectedTo, Reading Comprehension Drills>
+<Mock Exam Administration, connectedTo, Student Progress Tracking>
+<Performance Prediction Models, connectedTo, Mock Exam Administration>
+<Performance Prediction Models, connectedTo, Student Progress Tracking>
+<Performance Prediction Models, connectedTo, Test_Taking Strategies>
+<Performance Prediction Models, connectedTo, Virtual Proctoring>
+<Performance Prediction Models, personalizes, Personalized Study Plans>
+<Personalized Study Plans, connectedTo, Flashcard Creation>
+<Professional Licensure Exam Prep, connectedTo, Performance Prediction Models>
+<Question Bank Management, supports, Student Progress Tracking>
+<Reading Comprehension Drills, connectedTo, Critical Thinking Development>
+<Student Progress Tracking, connectedTo, Reading Comprehension Drills>
+<Test_Taking Strategies, connectedTo, Math Skills Refresher>
+<Time Management Coaching, connectedTo, Critical Thinking Development>
+<Time Management Coaching, connectedTo, Flashcard Creation>
+<Time Management Coaching, connectedTo, History Topic Mastery>
+<Time Management Coaching, connectedTo, Performance Prediction Models>
+<Time Management Coaching, connectedTo, Personalized Study Plans>
+<Virtual Proctoring, connectedTo, AI_Powered Tutoring>
+<Writing Skills Improvement, connectedTo, Professional Licensure Exam Prep>
diff --git a/test/diagrams/graph_hard/diagrams_244.dot b/test/diagrams/graph_hard/diagrams_244.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ada3254b6f3ca6eacf645fea1b4f4a0e059d06f6
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_244.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=BT
+	N0 [label="Grammar Practice" color="#E91E63" fillcolor="#F8BBD0" shape=document style=filled]
+	N1 [label="Memory Retention Techniques" color="#00BCD4" fillcolor="#E0F7FA" shape=action style=filled]
+	N2 [label="Personalized Learning Paths" color="#E91E63" fillcolor="#F8BBD0" shape=rect style=filled]
+	N3 [label="Business Language Training" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N4 [label="Children's Language Learning" color="#FFC085" fillcolor="#FFDAB9" shape=predefinedprocess style=filled]
+	N5 [label="Native Speaker Interaction" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N6 [label="Pronunciation Drills" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+	N7 [label="Vocabulary Acquisition" color="#00BCD4" fillcolor="#E0F7FA" shape=action style=filled]
+	N8 [label="Error Correction Feedback" color="#00BCD4" fillcolor="#E0F7FA" shape=document style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Virtual Reality Language Environments {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Virtual Reality Language Environments"
+		nest0_0 [label="Instructor_Led Classes" color="#FFC085" fillcolor="#FFDAB9" shape=vnode_shape style=filled]
+		nest0_1 [label="Video Lessons" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+		nest0_2 [label="Language Assessment Tests" color="#FFC085" fillcolor="#FFDAB9" shape=rectangle style=filled]
+		nest0_3 [label="Accent Reduction Coaching" color="#E91E63" fillcolor="#F8BBD0" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Speech Recognition Technology {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Speech Recognition Technology"
+		nest1_0 [label="Contextual Learning" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+		nest1_1 [label="Language for Specific Purposes" color="#FFC085" fillcolor="#FFDAB9" shape=rect style=filled]
+		nest1_2 [label="Role_Playing Scenarios" color="#00BCD4" fillcolor="#E0F7FA" shape=vnode_shape style=filled]
+		nest1_3 [label="Writing Exercises" color="#E91E63" fillcolor="#F8BBD0" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N6 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#FFC085" penwidth=1.5 style=dashed label="improves" dir=forward]
+	N2 -> nest1_0 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N8 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S0 -> N3 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
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+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_244.txt b/test/diagrams/graph_hard/diagrams_244.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9eaf444afa9ce2da26aed0ebb67221da92f84b60
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_244.txt
@@ -0,0 +1,25 @@
+<Accent Reduction Coaching, connectedTo, Pronunciation Drills>
+<Business Language Training, connectedTo, Children's Language Learning>
+<Children's Language Learning, connectedTo, Native Speaker Interaction>
+<Contextual Learning, connectedTo, Language for Specific Purposes>
+<Error Correction Feedback, connectedTo, Grammar Practice>
+<Grammar Practice, connectedTo, Business Language Training>
+<Grammar Practice, connectedTo, Error Correction Feedback>
+<Grammar Practice, connectedTo, Memory Retention Techniques>
+<Grammar Practice, connectedTo, Native Speaker Interaction>
+<Instructor_Led Classes, connectedTo, Video Lessons>
+<Language Assessment Tests, connectedTo, Accent Reduction Coaching>
+<Language for Specific Purposes, connectedTo, Role_Playing Scenarios>
+<Memory Retention Techniques, connectedTo, Business Language Training>
+<Memory Retention Techniques, connectedTo, Children's Language Learning>
+<Memory Retention Techniques, connectedTo, Error Correction Feedback>
+<Memory Retention Techniques, connectedTo, Personalized Learning Paths>
+<Native Speaker Interaction, connectedTo, Pronunciation Drills>
+<Personalized Learning Paths, connectedTo, Business Language Training>
+<Personalized Learning Paths, connectedTo, Contextual Learning>
+<Personalized Learning Paths, connectedTo, Instructor_Led Classes>
+<Pronunciation Drills, connectedTo, Vocabulary Acquisition>
+<Role_Playing Scenarios, improves, Writing Exercises>
+<Video Lessons, connectedTo, Language Assessment Tests>
+<Vocabulary Acquisition, connectedTo, Error Correction Feedback>
+<Writing Exercises, connectedTo, Error Correction Feedback>
diff --git a/test/diagrams/graph_hard/diagrams_245.dot b/test/diagrams/graph_hard/diagrams_245.dot
new file mode 100644
index 0000000000000000000000000000000000000000..965cabf33d3f3d0a5d4963ba89f82eda1a990f55
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_245.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=BT
+	N0 [label="Vocabulary Acquisition" color="#AF56A6" fillcolor="#DDCEDD" shape=preparation style=filled]
+	N1 [label="Gamified Learning Activities" color="#FFF176" fillcolor="#FFFDE7" shape=database style=filled]
+	N2 [label="Speaking Practice" color="#FFF176" fillcolor="#FFFDE7" shape=database style=filled]
+	N3 [label="Audio Lessons" color="#FFF176" fillcolor="#FFFDE7" shape=rect style=filled]
+	N4 [label="Accent Reduction Coaching" color="#FFF176" fillcolor="#FFFDE7" shape=multipledocuments style=filled]
+	N5 [label="Speech Recognition Technology" color="#AF56A6" fillcolor="#DDCEDD" shape=rect style=filled]
+	N6 [label="Self_Study Modules" color="#FFF176" fillcolor="#FFFDE7" shape=preparation style=filled]
+	N7 [label="Grammar Practice" color="#4DD0E1" fillcolor="#C9F0F0" shape=document style=filled]
+	N8 [label="Translation Exercises" color="#AF56A6" fillcolor="#DDCEDD" shape=rectangle style=filled]
+	N9 [label="Listening Comprehension" color="#FFF176" fillcolor="#FFFDE7" shape=rectangle style=filled]
+	N10 [label="Role_Playing Scenarios" color="#FFF176" fillcolor="#FFFDE7" shape=action style=filled]
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+	S2 [label="" color="#4DD0E1" fillcolor="#C9F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFF176" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFF176" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Cultural Immersion {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Cultural Immersion"
+		nest0_0 [label="Adult Language Learning" color="#4DD0E1" fillcolor="#C9F0F0" shape=parallelogram style=filled]
+		nest0_1 [label="Travel Language Essentials" color="#4DD0E1" fillcolor="#C9F0F0" shape=multipledocuments style=filled]
+		nest0_2 [label="Personalized Learning Paths" color="#FFF176" fillcolor="#FFFDE7" shape=diamond style=filled]
+	}
+	subgraph cluster_Language for Specific Purposes {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Language for Specific Purposes"
+		nest1_0 [label="Instructor_Led Classes" color="#4DD0E1" fillcolor="#C9F0F0" shape=parallelogram style=filled]
+		nest1_1 [label="Pronunciation Drills" color="#AF56A6" fillcolor="#DDCEDD" shape=document style=filled]
+		nest1_2 [label="Reading Comprehension" color="#4DD0E1" fillcolor="#C9F0F0" shape=multipledocuments style=filled]
+		nest1_3 [label="Business Language Training" color="#4DD0E1" fillcolor="#C9F0F0" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FFF176" penwidth=1.5 style=dashed label="translates" dir=forward]
+	N2 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N3 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid label="writes" dir=forward]
+	nest1_2 -> nest1_3 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N3 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#4DD0E1" penwidth=1.5 style=dashed label="distributes" dir=forward]
+	S0 -> N5 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N3 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N6 -> S2 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=solid label="practices" dir=forward]
+	N2 -> M0 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N10 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M2 [color="#4DD0E1" penwidth=1.5 style=solid label="analyzes" dir=forward]
+	N8 -> M2 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=dashed label="publishes" dir=forward]
+	M2 -> N10 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_246.dot b/test/diagrams/graph_hard/diagrams_246.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cb3352e21afb2fb55b73ea658254bef463bfe547
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_246.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=RL
+	N0 [label="Children's Language Learning" color="#00BCD4" fillcolor="#E0F7FA" shape=multipledocuments style=filled]
+	N1 [label="Error Correction Feedback" color="#AF56A6" fillcolor="#DDCEDD" shape=preparation style=filled]
+	N2 [label="Audio Lessons" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N3 [label="Online Tutoring Sessions" color="#00BCD4" fillcolor="#E0F7FA" shape=action style=filled]
+	N4 [label="Language Exchange Programs" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N5 [label="Personalized Learning Paths" color="#00BCD4" fillcolor="#E0F7FA" shape=diamond style=filled]
+	N6 [label="Video Lessons" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N7 [label="Curriculum Customization" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N8 [label="Travel Language Essentials" color="#AF56A6" fillcolor="#DDCEDD" shape=multipledocuments style=filled]
+	N9 [label="Translation Exercises" color="#AF56A6" fillcolor="#DDCEDD" shape=vnode_shape style=filled]
+	N10 [label="Gamified Learning Activities" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N11 [label="Flashcard Systems" color="#AB47BC" fillcolor="#F3E5F5" shape=multipledocuments style=filled]
+	N12 [label="AI_Powered Language Tutors" color="#00BCD4" fillcolor="#E0F7FA" shape=vnode_shape style=filled]
+	S0 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AB47BC" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AB47BC" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Contextual Learning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Contextual Learning"
+		nest0_0 [label="Writing Exercises" color="#00BCD4" fillcolor="#E0F7FA" shape=action style=filled]
+		nest0_1 [label="Listening Comprehension" color="#AF56A6" fillcolor="#DDCEDD" shape=preparation style=filled]
+	}
+	subgraph cluster_Speaking Practice {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Speaking Practice"
+		nest1_0 [label="Virtual Reality Language Environments" color="#AB47BC" fillcolor="#F3E5F5" shape=rect style=filled]
+		nest1_1 [label="Native Speaker Interaction" color="#00BCD4" fillcolor="#E0F7FA" shape=preparation style=filled]
+		nest1_2 [label="Cultural Immersion" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed label="markets" dir=forward]
+	N4 -> N5 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#AF56A6" penwidth=1.5 style=solid label="distributes" dir=forward]
+	N9 -> nest0_0 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N5 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest1_0 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S0 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N9 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	M0 -> N12 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	M1 -> N12 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N5 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_246.txt b/test/diagrams/graph_hard/diagrams_246.txt
new file mode 100644
index 0000000000000000000000000000000000000000..977bda735d9e34d668ab700bffde5e33160ea8e2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_246.txt
@@ -0,0 +1,32 @@
+<Audio Lessons, connectedTo, AI_Powered Language Tutors>
+<Audio Lessons, connectedTo, Online Tutoring Sessions>
+<Audio Lessons, connectedTo, Personalized Learning Paths>
+<Children's Language Learning, connectedTo, Error Correction Feedback>
+<Cultural Immersion, connectedTo, Translation Exercises>
+<Curriculum Customization, connectedTo, AI_Powered Language Tutors>
+<Curriculum Customization, connectedTo, Flashcard Systems>
+<Curriculum Customization, connectedTo, Translation Exercises>
+<Curriculum Customization, connectedTo, Travel Language Essentials>
+<Error Correction Feedback, connectedTo, AI_Powered Language Tutors>
+<Error Correction Feedback, connectedTo, Audio Lessons>
+<Error Correction Feedback, connectedTo, Personalized Learning Paths>
+<Flashcard Systems, connectedTo, AI_Powered Language Tutors>
+<Gamified Learning Activities, connectedTo, Flashcard Systems>
+<Language Exchange Programs, connectedTo, AI_Powered Language Tutors>
+<Language Exchange Programs, connectedTo, Personalized Learning Paths>
+<Listening Comprehension, connectedTo, Personalized Learning Paths>
+<Native Speaker Interaction, connectedTo, Cultural Immersion>
+<Online Tutoring Sessions, connectedTo, AI_Powered Language Tutors>
+<Online Tutoring Sessions, connectedTo, Personalized Learning Paths>
+<Online Tutoring Sessions, markets, Language Exchange Programs>
+<Personalized Learning Paths, connectedTo, AI_Powered Language Tutors>
+<Personalized Learning Paths, connectedTo, Video Lessons>
+<Personalized Learning Paths, connectedTo, Virtual Reality Language Environments>
+<Translation Exercises, connectedTo, AI_Powered Language Tutors>
+<Translation Exercises, connectedTo, Flashcard Systems>
+<Translation Exercises, connectedTo, Gamified Learning Activities>
+<Translation Exercises, connectedTo, Writing Exercises>
+<Travel Language Essentials, connectedTo, Translation Exercises>
+<Video Lessons, connectedTo, Curriculum Customization>
+<Virtual Reality Language Environments, connectedTo, Native Speaker Interaction>
+<Writing Exercises, distributes, Listening Comprehension>
diff --git a/test/diagrams/graph_hard/diagrams_247.dot b/test/diagrams/graph_hard/diagrams_247.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7fca733004645759a726bbb5145006c81df49bf8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_247.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=RL
+	N0 [label="Dialectical Behavior Therapy" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N1 [label="Diagnosis and Assessment" color="#A188DB" fillcolor="#DED7F0" shape=document style=filled]
+	N2 [label="Schizophrenia Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=preparation style=filled]
+	N3 [label="Telehealth Counseling" color="#CD8FF2" fillcolor="#ECCFF5" shape=multipledocuments style=filled]
+	N4 [label="Outpatient Program Management" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N5 [label="Stress Reduction Techniques" color="#CD8FF2" fillcolor="#ECCFF5" shape=rect style=filled]
+	N6 [label="Mindfulness Practice" color="#D3EB9F" fillcolor="#F8FDD3" shape=action style=filled]
+	N7 [label="Grief Counseling" color="#A188DB" fillcolor="#DED7F0" shape=predefinedprocess style=filled]
+	N8 [label="Suicide Prevention" color="#D3EB9F" fillcolor="#F8FDD3" shape=predefinedprocess style=filled]
+	N9 [label="Bipolar Disorder Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=document style=filled]
+	N10 [label="Depression Treatment" color="#A188DB" fillcolor="#DED7F0" shape=parallelogram style=filled]
+	N11 [label="Post_Traumatic Stress Disorder Support" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+	N12 [label="Advocacy for Mental Health" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N13 [label="Digital Mental Health Tools" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N14 [label="Coping Skill Development" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	S0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Therapy Session {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Therapy Session"
+		nest0_0 [label="Cognitive Behavioral Therapy" color="#CD8FF2" fillcolor="#ECCFF5" shape=multipledocuments style=filled]
+		nest0_1 [label="Peer Support Programs" color="#D3EB9F" fillcolor="#F8FDD3" shape=action style=filled]
+		nest0_2 [label="Workplace Mental Health Programs" color="#A188DB" fillcolor="#DED7F0" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Trauma Therapy {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Trauma Therapy"
+		nest1_0 [label="Mental Health Screening" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+		nest1_1 [label="Mental Health Education" color="#A188DB" fillcolor="#DED7F0" shape=diamond style=filled]
+		nest1_2 [label="Psychiatric Evaluation" color="#D3EB9F" fillcolor="#F8FDD3" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed label="provides" dir=forward]
+	N3 -> N4 [color="#CD8FF2" penwidth=1.5 style=dashed label="therapies" dir=forward]
+	N4 -> N5 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N2 -> nest0_0 [color="#A188DB" penwidth=1.5 style=solid label="monitors" dir=forward]
+	nest0_2 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N11 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N3 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N10 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N13 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N14 [color="#A188DB" penwidth=1.5 style=solid label="medicates" dir=forward]
+	N2 -> M1 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M1 [color="#D3EB9F" penwidth=1.5 style=dashed label="communicates" dir=forward]
+	M1 -> N13 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	M2 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_247.txt b/test/diagrams/graph_hard/diagrams_247.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4a8df170567501546b3926ec220568ef4a672fd4
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_247.txt
@@ -0,0 +1,35 @@
+<Advocacy for Mental Health, connectedTo, Digital Mental Health Tools>
+<Advocacy for Mental Health, connectedTo, Mental Health Screening>
+<Bipolar Disorder Management, communicates, Digital Mental Health Tools>
+<Bipolar Disorder Management, connectedTo, Depression Treatment>
+<Cognitive Behavioral Therapy, connectedTo, Peer Support Programs>
+<Depression Treatment, connectedTo, Digital Mental Health Tools>
+<Depression Treatment, connectedTo, Post_Traumatic Stress Disorder Support>
+<Depression Treatment, medicates, Coping Skill Development>
+<Diagnosis and Assessment, connectedTo, Advocacy for Mental Health>
+<Diagnosis and Assessment, connectedTo, Digital Mental Health Tools>
+<Diagnosis and Assessment, connectedTo, Schizophrenia Management>
+<Diagnosis and Assessment, connectedTo, Stress Reduction Techniques>
+<Dialectical Behavior Therapy, connectedTo, Diagnosis and Assessment>
+<Digital Mental Health Tools, connectedTo, Coping Skill Development>
+<Grief Counseling, connectedTo, Suicide Prevention>
+<Mental Health Education, connectedTo, Psychiatric Evaluation>
+<Mental Health Screening, connectedTo, Mental Health Education>
+<Mindfulness Practice, connectedTo, Grief Counseling>
+<Outpatient Program Management, connectedTo, Depression Treatment>
+<Outpatient Program Management, connectedTo, Stress Reduction Techniques>
+<Peer Support Programs, connectedTo, Workplace Mental Health Programs>
+<Post_Traumatic Stress Disorder Support, connectedTo, Advocacy for Mental Health>
+<Psychiatric Evaluation, connectedTo, Post_Traumatic Stress Disorder Support>
+<Schizophrenia Management, connectedTo, Depression Treatment>
+<Schizophrenia Management, connectedTo, Digital Mental Health Tools>
+<Schizophrenia Management, monitors, Cognitive Behavioral Therapy>
+<Schizophrenia Management, provides, Telehealth Counseling>
+<Stress Reduction Techniques, connectedTo, Mindfulness Practice>
+<Suicide Prevention, connectedTo, Bipolar Disorder Management>
+<Telehealth Counseling, connectedTo, Bipolar Disorder Management>
+<Telehealth Counseling, connectedTo, Digital Mental Health Tools>
+<Telehealth Counseling, connectedTo, Stress Reduction Techniques>
+<Telehealth Counseling, connectedTo, Suicide Prevention>
+<Telehealth Counseling, therapies, Outpatient Program Management>
+<Workplace Mental Health Programs, connectedTo, Coping Skill Development>
diff --git a/test/diagrams/graph_hard/diagrams_248.dot b/test/diagrams/graph_hard/diagrams_248.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7fae6cd177d3a71a95823a33e1aedd4aa38181e2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_248.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=LR
+	N0 [label="Group Therapy" color="#2196F3" fillcolor="#BBDEFB" shape=database style=filled]
+	N1 [label="Mental Health Screening" color="#D3EB9F" fillcolor="#F8FDD3" shape=rect style=filled]
+	N2 [label="Outpatient Program Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=action style=filled]
+	N3 [label="Eating Disorder Treatment" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N4 [label="Music Therapy" color="#2196F3" fillcolor="#BBDEFB" shape=diamond style=filled]
+	N5 [label="Digital Mental Health Tools" color="#6FE1D5" fillcolor="#C9EFEC" shape=multipledocuments style=filled]
+	N6 [label="Art Therapy" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N7 [label="Anxiety Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=vnode_shape style=filled]
+	N8 [label="Telehealth Counseling" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N9 [label="Family Therapy" color="#D3EB9F" fillcolor="#F8FDD3" shape=preparation style=filled]
+	N10 [label="Crisis Intervention" color="#2196F3" fillcolor="#BBDEFB" shape=vnode_shape style=filled]
+	N11 [label="Trauma Therapy" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N12 [label="Relapse Prevention" color="#2196F3" fillcolor="#BBDEFB" shape=diamond style=filled]
+	N13 [label="Inpatient Treatment Coordination" color="#D3EB9F" fillcolor="#F8FDD3" shape=rect style=filled]
+	N14 [label="Stress Reduction Techniques" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N15 [label="Cognitive Behavioral Therapy" color="#D3EB9F" fillcolor="#F8FDD3" shape=action style=filled]
+	S0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Diagnosis and Assessment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Diagnosis and Assessment"
+		nest0_0 [label="Treatment Plan Development" color="#D3EB9F" fillcolor="#F8FDD3" shape=document style=filled]
+		nest0_1 [label="Psychiatric Evaluation" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+		nest0_2 [label="Medication Management" color="#2196F3" fillcolor="#BBDEFB" shape=predefinedprocess style=filled]
+		nest0_3 [label="Post_Traumatic Stress Disorder Support" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	}
+	subgraph cluster_Mental Health Education {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Mental Health Education"
+		nest1_0 [label="Mindfulness Practice" color="#2196F3" fillcolor="#BBDEFB" shape=predefinedprocess style=filled]
+		nest1_1 [label="Suicide Prevention" color="#6FE1D5" fillcolor="#C9EFEC" shape=document style=filled]
+		nest1_2 [label="Coping Skill Development" color="#6FE1D5" fillcolor="#C9EFEC" shape=predefinedprocess style=filled]
+		nest1_3 [label="Bipolar Disorder Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	}
+	N0 -> N1 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N5 [color="#6FE1D5" penwidth=1.5 style=dashed label="supports" dir=forward]
+	nest1_0 -> nest1_1 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest1_0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N4 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_248.txt b/test/diagrams/graph_hard/diagrams_248.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4274ab0b85f4044fed46dd41fe5479b5982d32ca
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_248.txt
@@ -0,0 +1,34 @@
+<Anxiety Management, connectedTo, Telehealth Counseling>
+<Art Therapy, connectedTo, Anxiety Management>
+<Art Therapy, connectedTo, Crisis Intervention>
+<Art Therapy, connectedTo, Inpatient Treatment Coordination>
+<Art Therapy, connectedTo, Relapse Prevention>
+<Art Therapy, connectedTo, Trauma Therapy>
+<Bipolar Disorder Management, connectedTo, Music Therapy>
+<Coping Skill Development, connectedTo, Bipolar Disorder Management>
+<Crisis Intervention, connectedTo, Trauma Therapy>
+<Digital Mental Health Tools, connectedTo, Art Therapy>
+<Eating Disorder Treatment, connectedTo, Music Therapy>
+<Family Therapy, connectedTo, Crisis Intervention>
+<Group Therapy, connectedTo, Mental Health Screening>
+<Inpatient Treatment Coordination, connectedTo, Mindfulness Practice>
+<Inpatient Treatment Coordination, connectedTo, Stress Reduction Techniques>
+<Medication Management, connectedTo, Post_Traumatic Stress Disorder Support>
+<Mental Health Screening, connectedTo, Crisis Intervention>
+<Mental Health Screening, connectedTo, Music Therapy>
+<Mental Health Screening, connectedTo, Outpatient Program Management>
+<Mental Health Screening, connectedTo, Stress Reduction Techniques>
+<Mental Health Screening, connectedTo, Trauma Therapy>
+<Mindfulness Practice, connectedTo, Suicide Prevention>
+<Music Therapy, connectedTo, Digital Mental Health Tools>
+<Outpatient Program Management, connectedTo, Eating Disorder Treatment>
+<Outpatient Program Management, connectedTo, Treatment Plan Development>
+<Post_Traumatic Stress Disorder Support, connectedTo, Music Therapy>
+<Post_Traumatic Stress Disorder Support, supports, Digital Mental Health Tools>
+<Psychiatric Evaluation, connectedTo, Medication Management>
+<Relapse Prevention, connectedTo, Inpatient Treatment Coordination>
+<Stress Reduction Techniques, connectedTo, Cognitive Behavioral Therapy>
+<Suicide Prevention, connectedTo, Coping Skill Development>
+<Telehealth Counseling, connectedTo, Family Therapy>
+<Trauma Therapy, connectedTo, Relapse Prevention>
+<Treatment Plan Development, connectedTo, Psychiatric Evaluation>
diff --git a/test/diagrams/graph_hard/diagrams_249.txt b/test/diagrams/graph_hard/diagrams_249.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3f7ff515f4273e92a01eb05500ed3c4476f69897
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_249.txt
@@ -0,0 +1,21 @@
+<Cognitive Behavioral Therapy, connectedTo, Stress Reduction Techniques>
+<Dialectical Behavior Therapy, connectedTo, Grief Counseling>
+<Dialectical Behavior Therapy, connectedTo, Medication Management>
+<Dialectical Behavior Therapy, connectedTo, Post_Traumatic Stress Disorder Support>
+<Dialectical Behavior Therapy, connectedTo, Suicide Prevention>
+<Medication Management, connectedTo, Grief Counseling>
+<Music Therapy, audits, Trauma Therapy>
+<Post_Traumatic Stress Disorder Support, connectedTo, Medication Management>
+<Post_Traumatic Stress Disorder Support, connectedTo, Suicide Prevention>
+<Psychiatric Evaluation, connectedTo, Music Therapy>
+<Recreational Therapy, connectedTo, Cognitive Behavioral Therapy>
+<Stress Reduction Techniques, connectedTo, Treatment Plan Development>
+<Suicide Prevention, connectedTo, Grief Counseling>
+<Suicide Prevention, connectedTo, Medication Management>
+<Suicide Prevention, connectedTo, Support Group Facilitation>
+<Suicide Prevention, connectedTo, Telehealth Counseling>
+<Support Group Facilitation, connectedTo, Psychiatric Evaluation>
+<Telehealth Counseling, connectedTo, Medication Management>
+<Telehealth Counseling, connectedTo, Recreational Therapy>
+<Trauma Therapy, connectedTo, Grief Counseling>
+<Treatment Plan Development, connectedTo, Suicide Prevention>
diff --git a/test/diagrams/graph_hard/diagrams_25.dot b/test/diagrams/graph_hard/diagrams_25.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f48ffe28f64bb4597514a936394c74173258fe69
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_25.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=RL
+	N0 [label="Air Cargo Handling" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N1 [label="Pickup Request" color="#00BCD4" fillcolor="#E0F7FA" shape=rectangle style=filled]
+	N2 [label="Customs Declaration" color="#00BCD4" fillcolor="#E0F7FA" shape=vnode_shape style=filled]
+	N3 [label="Vehicle Loading" color="#00BCD4" fillcolor="#E0F7FA" shape=database style=filled]
+	N4 [label="Cold Chain Management" color="#FFC085" fillcolor="#FFDAB9" shape=database style=filled]
+	N5 [label="Package Labeling" color="#FFF9AE" fillcolor="#FFFCE6" shape=rectangle style=filled]
+	N6 [label="Route Assignment" color="#FFC085" fillcolor="#FFDAB9" shape=inputoutput style=filled]
+	N7 [label="Pallet Stacking" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N8 [label="Customs Clearance" color="#00BCD4" fillcolor="#E0F7FA" shape=diamond style=filled]
+	N9 [label="Supply Chain Visibility" color="#00BCD4" fillcolor="#E0F7FA" shape=inputoutput style=filled]
+	N10 [label="Consolidation" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+	S0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Demand Forecasting Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Demand Forecasting Integration"
+		nest0_0 [label="Carrier Selection" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest0_1 [label="Order Picking" color="#00BCD4" fillcolor="#E0F7FA" shape=predefinedprocess style=filled]
+		nest0_2 [label="Ocean Freight Management" color="#00BCD4" fillcolor="#E0F7FA" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Deconsolidation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Deconsolidation"
+		nest1_0 [label="Delay Notification" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+		nest1_1 [label="Last_mile Dispatch" color="#00BCD4" fillcolor="#E0F7FA" shape=database style=filled]
+		nest1_2 [label="Rail Transport Coordination" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+		nest1_3 [label="Sorting Center" color="#FFC085" fillcolor="#FFDAB9" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#FFF9AE" penwidth=1.5 style=dashed label="books" dir=forward]
+	N1 -> N2 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest0_0 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N2 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N8 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N5 -> S2 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N7 [color="#FFF9AE" penwidth=1.5 style=dashed label="syncs" dir=forward]
+	S2 -> N10 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#00BCD4" penwidth=1.5 style=dashed label="automates" dir=forward]
+	M1 -> N7 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_25.txt b/test/diagrams/graph_hard/diagrams_25.txt
new file mode 100644
index 0000000000000000000000000000000000000000..504b3635ffa1c29c6e5ac40e5eb4c3a16cb28bdc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_25.txt
@@ -0,0 +1,35 @@
+<Air Cargo Handling, books, Pickup Request>
+<Air Cargo Handling, connectedTo, Vehicle Loading>
+<Carrier Selection, connectedTo, Order Picking>
+<Cold Chain Management, connectedTo, Package Labeling>
+<Customs Clearance, connectedTo, Supply Chain Visibility>
+<Customs Declaration, connectedTo, Cold Chain Management>
+<Customs Declaration, connectedTo, Delay Notification>
+<Customs Declaration, connectedTo, Package Labeling>
+<Customs Declaration, connectedTo, Pallet Stacking>
+<Customs Declaration, connectedTo, Vehicle Loading>
+<Delay Notification, connectedTo, Last_mile Dispatch>
+<Delay Notification, partOf, Delay Notification>
+<Last_mile Dispatch, connectedTo, Rail Transport Coordination>
+<Last_mile Dispatch, partOf, Last_mile Dispatch>
+<Ocean Freight Management, connectedTo, Pallet Stacking>
+<Order Picking, connectedTo, Ocean Freight Management>
+<Package Labeling, automates, Pallet Stacking>
+<Package Labeling, connectedTo, Consolidation>
+<Package Labeling, connectedTo, Route Assignment>
+<Package Labeling, syncs, Pallet Stacking>
+<Pallet Stacking, connectedTo, Customs Clearance>
+<Pickup Request, connectedTo, Consolidation>
+<Pickup Request, connectedTo, Customs Declaration>
+<Pickup Request, connectedTo, Package Labeling>
+<Pickup Request, connectedTo, Pallet Stacking>
+<Pickup Request, connectedTo, Vehicle Loading>
+<Rail Transport Coordination, connectedTo, Sorting Center>
+<Rail Transport Coordination, partOf, Rail Transport Coordination>
+<Route Assignment, connectedTo, Pallet Stacking>
+<Sorting Center, connectedTo, Customs Clearance>
+<Sorting Center, partOf, Sorting Center>
+<Supply Chain Visibility, connectedTo, Carrier Selection>
+<Supply Chain Visibility, connectedTo, Consolidation>
+<Vehicle Loading, connectedTo, Cold Chain Management>
+<Vehicle Loading, connectedTo, Pallet Stacking>
diff --git a/test/diagrams/graph_hard/diagrams_250.dot b/test/diagrams/graph_hard/diagrams_250.dot
new file mode 100644
index 0000000000000000000000000000000000000000..28016fa15bf0577cc316663551d518d6209c39b6
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_250.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=LR
+	N0 [label="Nutrigenomics Research" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N1 [label="Maternal Nutrition" color="#CFCFCF" fillcolor="#F6F6F6" shape=multipledocuments style=filled]
+	N2 [label="Child Nutrition" color="#CFCFCF" fillcolor="#F6F6F6" shape=rectangle style=filled]
+	N3 [label="Disease_Specific Nutrition" color="#80DDEA" fillcolor="#D3F7F9" shape=inputoutput style=filled]
+	N4 [label="Macronutrient Tracking" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N5 [label="Meal Planning" color="#FFC2C2" fillcolor="#FFEBEB" shape=parallelogram style=filled]
+	N6 [label="Food Safety Education" color="#CFCFCF" fillcolor="#F6F6F6" shape=rect style=filled]
+	N7 [label="Grocery Shopping Guidance" color="#80DDEA" fillcolor="#D3F7F9" shape=parallelogram style=filled]
+	N8 [label="Food Fortification Strategies" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N9 [label="Dietary Supplement Review" color="#FFC2C2" fillcolor="#FFEBEB" shape=rectangle style=filled]
+	N10 [label="Genetic Nutrition Counseling" color="#CFCFCF" fillcolor="#F6F6F6" shape=multipledocuments style=filled]
+	S0 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFC2C2" fillcolor="#FFEBEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Micronutrient Analysis {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Micronutrient Analysis"
+		nest0_0 [label="Inflammation and Diet" color="#FFC2C2" fillcolor="#FFEBEB" shape=preparation style=filled]
+		nest0_1 [label="Supplement Recommendation" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+		nest0_2 [label="Community Nutrition Workshops" color="#80DDEA" fillcolor="#D3F7F9" shape=document style=filled]
+	}
+	subgraph cluster_Agricultural Nutrition Impact {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Agricultural Nutrition Impact"
+		nest1_0 [label="Weight Management" color="#FFC2C2" fillcolor="#FFEBEB" shape=database style=filled]
+		nest1_1 [label="Recipe Adaptation" color="#FFC2C2" fillcolor="#FFEBEB" shape=database style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest0_0 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N6 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#80DDEA" penwidth=1.5 style=solid label="complies" dir=forward]
+	N3 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N4 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N2 -> S0 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S1 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S2 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	S2 -> N9 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N9 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N3 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_250.txt b/test/diagrams/graph_hard/diagrams_250.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3080ecc2f498231e67f5f03fdd0266d41ce81833
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_250.txt
@@ -0,0 +1,27 @@
+<Child Nutrition, connectedTo, Dietary Supplement Review>
+<Child Nutrition, connectedTo, Disease_Specific Nutrition>
+<Child Nutrition, connectedTo, Food Safety Education>
+<Child Nutrition, connectedTo, Grocery Shopping Guidance>
+<Community Nutrition Workshops, connectedTo, Food Safety Education>
+<Dietary Supplement Review, connectedTo, Genetic Nutrition Counseling>
+<Disease_Specific Nutrition, connectedTo, Dietary Supplement Review>
+<Disease_Specific Nutrition, connectedTo, Macronutrient Tracking>
+<Disease_Specific Nutrition, connectedTo, Weight Management>
+<Food Fortification Strategies, connectedTo, Dietary Supplement Review>
+<Food Safety Education, connectedTo, Dietary Supplement Review>
+<Food Safety Education, connectedTo, Food Fortification Strategies>
+<Food Safety Education, connectedTo, Genetic Nutrition Counseling>
+<Food Safety Education, connectedTo, Grocery Shopping Guidance>
+<Food Safety Education, connectedTo, Inflammation and Diet>
+<Grocery Shopping Guidance, connectedTo, Food Fortification Strategies>
+<Inflammation and Diet, connectedTo, Supplement Recommendation>
+<Macronutrient Tracking, connectedTo, Meal Planning>
+<Maternal Nutrition, connectedTo, Child Nutrition>
+<Maternal Nutrition, connectedTo, Disease_Specific Nutrition>
+<Meal Planning, connectedTo, Dietary Supplement Review>
+<Meal Planning, connectedTo, Food Safety Education>
+<Nutrigenomics Research, connectedTo, Disease_Specific Nutrition>
+<Nutrigenomics Research, connectedTo, Maternal Nutrition>
+<Recipe Adaptation, connectedTo, Macronutrient Tracking>
+<Supplement Recommendation, connectedTo, Community Nutrition Workshops>
+<Weight Management, complies, Recipe Adaptation>
diff --git a/test/diagrams/graph_hard/diagrams_251.dot b/test/diagrams/graph_hard/diagrams_251.dot
new file mode 100644
index 0000000000000000000000000000000000000000..bfcee5afbba6d1abab4e49ce042a65f1fcb4a827
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_251.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=BT
+	N0 [label="Food Fortification Strategies" color="#DCE775" fillcolor="#F9FBE7" shape=document style=filled]
+	N1 [label="Macronutrient Tracking" color="#DCE775" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N2 [label="Body Composition Analysis" color="#D2D2D2" fillcolor="#F0F0F0" shape=parallelogram style=filled]
+	N3 [label="Agricultural Nutrition Impact" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N4 [label="Recipe Adaptation" color="#CDDC39" fillcolor="#E6EE9C" shape=preparation style=filled]
+	N5 [label="Food Allergy Management" color="#CDDC39" fillcolor="#E6EE9C" shape=rectangle style=filled]
+	N6 [label="Supplement Recommendation" color="#CDDC39" fillcolor="#E6EE9C" shape=multipledocuments style=filled]
+	N7 [label="Nutritional Biomarker Analysis" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N8 [label="Hydration Planning" color="#D2D2D2" fillcolor="#F0F0F0" shape=database style=filled]
+	N9 [label="Community Nutrition Workshops" color="#D2D2D2" fillcolor="#F0F0F0" shape=rectangle style=filled]
+	N10 [label="Eating Habit Modification" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N11 [label="Nutritional Counseling" color="#DCE775" fillcolor="#F9FBE7" shape=preparation style=filled]
+	N12 [label="Maternal Nutrition" color="#DCE775" fillcolor="#F9FBE7" shape=inputoutput style=filled]
+	N13 [label="Food Waste Reduction" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	S0 [label="" color="#D2D2D2" fillcolor="#F0F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#D2D2D2" fillcolor="#F0F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Dietary Software Usage {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Dietary Software Usage"
+		nest0_0 [label="Disease_Specific Nutrition" color="#DCE775" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+		nest0_1 [label="Weight Management" color="#DCE775" fillcolor="#F9FBE7" shape=action style=filled]
+		nest0_2 [label="Sports Nutrition" color="#DCE775" fillcolor="#F9FBE7" shape=vnode_shape style=filled]
+		nest0_3 [label="Dietary Assessment" color="#CDDC39" fillcolor="#E6EE9C" shape=rect style=filled]
+	}
+	subgraph cluster_Food Preparation Guidance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Food Preparation Guidance"
+		nest1_0 [label="Detoxification Programs" color="#D2D2D2" fillcolor="#F0F0F0" shape=database style=filled]
+		nest1_1 [label="Gut Microbiome Health" color="#D2D2D2" fillcolor="#F0F0F0" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#CDDC39" penwidth=1.5 style=dashed label="measures" dir=forward]
+	N1 -> N2 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed label="tracks" dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed label="researches" dir=forward]
+	N6 -> N7 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest0_0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N10 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N12 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N7 -> S2 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N13 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N8 -> M0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	M1 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_251.txt b/test/diagrams/graph_hard/diagrams_251.txt
new file mode 100644
index 0000000000000000000000000000000000000000..16f7e837776bb4323772f62c0ac18356dfcdfde4
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_251.txt
@@ -0,0 +1,34 @@
+<Agricultural Nutrition Impact, connectedTo, Community Nutrition Workshops>
+<Agricultural Nutrition Impact, connectedTo, Eating Habit Modification>
+<Agricultural Nutrition Impact, connectedTo, Recipe Adaptation>
+<Body Composition Analysis, connectedTo, Agricultural Nutrition Impact>
+<Community Nutrition Workshops, connectedTo, Eating Habit Modification>
+<Detoxification Programs, connectedTo, Gut Microbiome Health>
+<Dietary Assessment, connectedTo, Food Waste Reduction>
+<Disease_Specific Nutrition, connectedTo, Weight Management>
+<Eating Habit Modification, connectedTo, Detoxification Programs>
+<Eating Habit Modification, connectedTo, Nutritional Counseling>
+<Food Allergy Management, connectedTo, Community Nutrition Workshops>
+<Food Allergy Management, researches, Supplement Recommendation>
+<Food Fortification Strategies, connectedTo, Community Nutrition Workshops>
+<Food Fortification Strategies, measures, Macronutrient Tracking>
+<Gut Microbiome Health, connectedTo, Maternal Nutrition>
+<Hydration Planning, connectedTo, Community Nutrition Workshops>
+<Hydration Planning, connectedTo, Eating Habit Modification>
+<Macronutrient Tracking, connectedTo, Body Composition Analysis>
+<Macronutrient Tracking, connectedTo, Disease_Specific Nutrition>
+<Macronutrient Tracking, connectedTo, Food Waste Reduction>
+<Macronutrient Tracking, connectedTo, Hydration Planning>
+<Macronutrient Tracking, connectedTo, Nutritional Counseling>
+<Maternal Nutrition, connectedTo, Food Waste Reduction>
+<Nutritional Biomarker Analysis, connectedTo, Food Waste Reduction>
+<Nutritional Biomarker Analysis, connectedTo, Hydration Planning>
+<Nutritional Biomarker Analysis, connectedTo, Maternal Nutrition>
+<Nutritional Biomarker Analysis, connectedTo, Nutritional Counseling>
+<Nutritional Counseling, connectedTo, Maternal Nutrition>
+<Recipe Adaptation, connectedTo, Community Nutrition Workshops>
+<Recipe Adaptation, connectedTo, Hydration Planning>
+<Recipe Adaptation, tracks, Food Allergy Management>
+<Sports Nutrition, connectedTo, Dietary Assessment>
+<Supplement Recommendation, connectedTo, Nutritional Biomarker Analysis>
+<Weight Management, connectedTo, Sports Nutrition>
diff --git a/test/diagrams/graph_hard/diagrams_252.dot b/test/diagrams/graph_hard/diagrams_252.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6ffc8b112fe461f75f2bd98b96fb98d5a6d8ad5e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_252.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=TB
+	N0 [label="Genetic Nutrition Counseling" color="#64B5F6" fillcolor="#E3F2FD" shape=parallelogram style=filled]
+	N1 [label="Dietary Software Usage" color="#F06292" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N2 [label="Nutritional Biomarker Analysis" color="#F06292" fillcolor="#FCE4EC" shape=preparation style=filled]
+	N3 [label="Child Nutrition" color="#F06292" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N4 [label="Food Label Interpretation" color="#F06292" fillcolor="#FCE4EC" shape=preparation style=filled]
+	N5 [label="Food Safety Education" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N6 [label="Agricultural Nutrition Impact" color="#F06292" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N7 [label="Detoxification Programs" color="#F06292" fillcolor="#FCE4EC" shape=inputoutput style=filled]
+	N8 [label="Recipe Adaptation" color="#64B5F6" fillcolor="#E3F2FD" shape=parallelogram style=filled]
+	N9 [label="Disease_Specific Nutrition" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N10 [label="Macronutrient Tracking" color="#F06292" fillcolor="#FCE4EC" shape=vnode_shape style=filled]
+	N11 [label="Metabolism Rate Assessment" color="#64B5F6" fillcolor="#E3F2FD" shape=multipledocuments style=filled]
+	N12 [label="Food Allergy Management" color="#F06292" fillcolor="#FCE4EC" shape=action style=filled]
+	N13 [label="Food Waste Reduction" color="#64B5F6" fillcolor="#E3F2FD" shape=database style=filled]
+	N14 [label="Weight Management" color="#F06292" fillcolor="#FCE4EC" shape=preparation style=filled]
+	N15 [label="Clinical Nutrition Support" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N16 [label="Food Fortification Strategies" color="#64B5F6" fillcolor="#E3F2FD" shape=database style=filled]
+	N17 [label="Sports Nutrition" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	S0 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Restaurant Menu Analysis {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Restaurant Menu Analysis"
+		nest0_0 [label="Food Preparation Guidance" color="#7E57C2" fillcolor="#D1C4E9" shape=database style=filled]
+		nest0_1 [label="Dietary Assessment" color="#7E57C2" fillcolor="#D1C4E9" shape=action style=filled]
+	}
+	subgraph cluster_Public Health Nutrition Programs {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Public Health Nutrition Programs"
+		nest1_0 [label="Eating Habit Modification" color="#F06292" fillcolor="#FCE4EC" shape=inputoutput style=filled]
+		nest1_1 [label="Maternal Nutrition" color="#64B5F6" fillcolor="#E3F2FD" shape=vnode_shape style=filled]
+		nest1_2 [label="Nutritional Counseling" color="#64B5F6" fillcolor="#E3F2FD" shape=rectangle style=filled]
+		nest1_3 [label="Community Nutrition Workshops" color="#64B5F6" fillcolor="#E3F2FD" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N13 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N16 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S0 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#7E57C2" penwidth=1.5 style=dashed label="prevents" dir=forward]
+	N3 -> M0 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N5 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N13 -> M1 [color="#64B5F6" penwidth=1.5 style=dashed label="processes" dir=forward]
+	M1 -> N16 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_252.txt b/test/diagrams/graph_hard/diagrams_252.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8a8189fa38a93825dd6529c91d4f9f95832d2794
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_252.txt
@@ -0,0 +1,34 @@
+<Agricultural Nutrition Impact, connectedTo, Detoxification Programs>
+<Child Nutrition, connectedTo, Food Label Interpretation>
+<Child Nutrition, connectedTo, Food Safety Education>
+<Clinical Nutrition Support, connectedTo, Food Fortification Strategies>
+<Community Nutrition Workshops, connectedTo, Metabolism Rate Assessment>
+<Detoxification Programs, connectedTo, Recipe Adaptation>
+<Dietary Assessment, connectedTo, Food Waste Reduction>
+<Dietary Software Usage, connectedTo, Disease_Specific Nutrition>
+<Dietary Software Usage, connectedTo, Food Safety Education>
+<Dietary Software Usage, connectedTo, Nutritional Biomarker Analysis>
+<Dietary Software Usage, connectedTo, Recipe Adaptation>
+<Dietary Software Usage, prevents, Metabolism Rate Assessment>
+<Disease_Specific Nutrition, connectedTo, Macronutrient Tracking>
+<Eating Habit Modification, connectedTo, Maternal Nutrition>
+<Food Allergy Management, connectedTo, Food Waste Reduction>
+<Food Fortification Strategies, connectedTo, Eating Habit Modification>
+<Food Fortification Strategies, connectedTo, Sports Nutrition>
+<Food Label Interpretation, connectedTo, Food Safety Education>
+<Food Preparation Guidance, connectedTo, Dietary Assessment>
+<Food Safety Education, connectedTo, Agricultural Nutrition Impact>
+<Food Safety Education, connectedTo, Food Preparation Guidance>
+<Food Safety Education, connectedTo, Metabolism Rate Assessment>
+<Food Safety Education, connectedTo, Weight Management>
+<Food Waste Reduction, connectedTo, Weight Management>
+<Food Waste Reduction, processes, Food Fortification Strategies>
+<Genetic Nutrition Counseling, connectedTo, Dietary Software Usage>
+<Macronutrient Tracking, connectedTo, Metabolism Rate Assessment>
+<Maternal Nutrition, connectedTo, Nutritional Counseling>
+<Metabolism Rate Assessment, connectedTo, Food Allergy Management>
+<Nutritional Biomarker Analysis, connectedTo, Child Nutrition>
+<Nutritional Counseling, connectedTo, Community Nutrition Workshops>
+<Recipe Adaptation, connectedTo, Disease_Specific Nutrition>
+<Recipe Adaptation, connectedTo, Food Fortification Strategies>
+<Weight Management, connectedTo, Clinical Nutrition Support>
diff --git a/test/diagrams/graph_hard/diagrams_253.dot b/test/diagrams/graph_hard/diagrams_253.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6da2303d9a5f23db83b10cd1a7b9b1fa4b0b6c24
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_253.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=TB
+	N0 [label="Cross_Training" color="#CD8FF2" fillcolor="#ECCFF5" shape=database style=filled]
+	N1 [label="Wearable Fitness Devices" color="#9FA9E1" fillcolor="#D6D9F0" shape=rectangle style=filled]
+	N2 [label="Virtual Fitness Classes" color="#CD8FF2" fillcolor="#ECCFF5" shape=predefinedprocess style=filled]
+	N3 [label="Cardiovascular Training" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N4 [label="Fitness Assessment" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N5 [label="Yoga Instruction" color="#CD8FF2" fillcolor="#ECCFF5" shape=rect style=filled]
+	N6 [label="Posture Correction" color="#9FA9E1" fillcolor="#D6D9F0" shape=inputoutput style=filled]
+	N7 [label="Personal Training" color="#9575CD" fillcolor="#EDE7F6" shape=multipledocuments style=filled]
+	N8 [label="Mind_Body Connection" color="#9FA9E1" fillcolor="#D6D9F0" shape=preparation style=filled]
+	N9 [label="Biometric Feedback Integration" color="#9575CD" fillcolor="#EDE7F6" shape=inputoutput style=filled]
+	N10 [label="Recovery Strategies" color="#9575CD" fillcolor="#EDE7F6" shape=preparation style=filled]
+	N11 [label="HIIT Workouts" color="#9575CD" fillcolor="#EDE7F6" shape=vnode_shape style=filled]
+	N12 [label="Fitness Equipment Maintenance" color="#9FA9E1" fillcolor="#D6D9F0" shape=database style=filled]
+	N13 [label="Youth Fitness Programs" color="#9575CD" fillcolor="#EDE7F6" shape=multipledocuments style=filled]
+	N14 [label="Sports_Specific Training" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+	N15 [label="Home Workout Programs" color="#9575CD" fillcolor="#EDE7F6" shape=multipledocuments style=filled]
+	N16 [label="Endurance Training" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+	N17 [label="Rehabilitation Exercises" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	S0 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Workout Tracking Apps {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Workout Tracking Apps"
+		nest0_0 [label="Flexibility Training" color="#9575CD" fillcolor="#EDE7F6" shape=action style=filled]
+		nest0_1 [label="Functional Fitness Training" color="#9575CD" fillcolor="#EDE7F6" shape=action style=filled]
+	}
+	subgraph cluster_Running Coaching {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Running Coaching"
+		nest1_0 [label="Body Composition Analysis" color="#9575CD" fillcolor="#EDE7F6" shape=hexagon style=filled]
+		nest1_1 [label="Weightlifting Techniques" color="#9FA9E1" fillcolor="#D6D9F0" shape=inputoutput style=filled]
+		nest1_2 [label="Hydration for Exercise" color="#9575CD" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed label="sells" dir=forward]
+	N7 -> N8 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N14 -> nest0_0 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N8 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N15 -> nest1_0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N10 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N2 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N14 -> S1 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N17 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S2 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N13 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N16 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M0 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N13 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#9FA9E1" penwidth=1.5 style=solid label="consults" dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_253.txt b/test/diagrams/graph_hard/diagrams_253.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f54acf9dcdd4bc2ea05583120623bb7ea69805c7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_253.txt
@@ -0,0 +1,38 @@
+<Biometric Feedback Integration, connectedTo, Recovery Strategies>
+<Body Composition Analysis, connectedTo, Weightlifting Techniques>
+<Cardiovascular Training, connectedTo, Fitness Assessment>
+<Cross_Training, connectedTo, Endurance Training>
+<Cross_Training, connectedTo, Fitness Assessment>
+<Cross_Training, connectedTo, Home Workout Programs>
+<Cross_Training, connectedTo, Wearable Fitness Devices>
+<Cross_Training, connectedTo, Youth Fitness Programs>
+<Endurance Training, connectedTo, Rehabilitation Exercises>
+<Fitness Assessment, connectedTo, Yoga Instruction>
+<Fitness Equipment Maintenance, connectedTo, Youth Fitness Programs>
+<Flexibility Training, connectedTo, Functional Fitness Training>
+<Functional Fitness Training, connectedTo, Mind_Body Connection>
+<HIIT Workouts, connectedTo, Fitness Equipment Maintenance>
+<Home Workout Programs, connectedTo, Body Composition Analysis>
+<Home Workout Programs, connectedTo, Endurance Training>
+<Hydration for Exercise, connectedTo, Recovery Strategies>
+<Mind_Body Connection, connectedTo, Biometric Feedback Integration>
+<Personal Training, connectedTo, Mind_Body Connection>
+<Personal Training, connectedTo, Youth Fitness Programs>
+<Posture Correction, sells, Personal Training>
+<Recovery Strategies, connectedTo, HIIT Workouts>
+<Sports_Specific Training, connectedTo, Endurance Training>
+<Sports_Specific Training, connectedTo, Flexibility Training>
+<Sports_Specific Training, connectedTo, Home Workout Programs>
+<Sports_Specific Training, connectedTo, Rehabilitation Exercises>
+<Virtual Fitness Classes, connectedTo, Biometric Feedback Integration>
+<Virtual Fitness Classes, connectedTo, Cardiovascular Training>
+<Virtual Fitness Classes, connectedTo, Fitness Assessment>
+<Virtual Fitness Classes, connectedTo, Fitness Equipment Maintenance>
+<Virtual Fitness Classes, connectedTo, Mind_Body Connection>
+<Virtual Fitness Classes, connectedTo, Sports_Specific Training>
+<Virtual Fitness Classes, connectedTo, Youth Fitness Programs>
+<Wearable Fitness Devices, connectedTo, Virtual Fitness Classes>
+<Wearable Fitness Devices, consults, Fitness Assessment>
+<Weightlifting Techniques, connectedTo, Hydration for Exercise>
+<Yoga Instruction, connectedTo, Posture Correction>
+<Youth Fitness Programs, connectedTo, Sports_Specific Training>
diff --git a/test/diagrams/graph_hard/diagrams_254.dot b/test/diagrams/graph_hard/diagrams_254.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9e9ff584c0967d86139810958245cdbd5fa2bf84
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_254.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=BT
+	N0 [label="Group Fitness Classes" color="#80DDEA" fillcolor="#D3F7F9" shape=multipledocuments style=filled]
+	N1 [label="Body Composition Analysis" color="#80DDEA" fillcolor="#D3F7F9" shape=rectangle style=filled]
+	N2 [label="Personalized Exercise Prescriptions" color="#FF8A65" fillcolor="#FBE9E7" shape=document style=filled]
+	N3 [label="Pilates Instruction" color="#FF8A65" fillcolor="#FBE9E7" shape=predefinedprocess style=filled]
+	N4 [label="Motivation and Goal Setting" color="#A1D7CD" fillcolor="#EDF5F3" shape=predefinedprocess style=filled]
+	N5 [label="Home Workout Programs" color="#A1D7CD" fillcolor="#EDF5F3" shape=predefinedprocess style=filled]
+	N6 [label="Personal Training" color="#FF8A65" fillcolor="#FBE9E7" shape=rect style=filled]
+	N7 [label="Community Fitness Challenges" color="#A1D7CD" fillcolor="#EDF5F3" shape=action style=filled]
+	N8 [label="Biometric Feedback Integration" color="#80DDEA" fillcolor="#D3F7F9" shape=vnode_shape style=filled]
+	N9 [label="Workout Tracking Apps" color="#FF8A65" fillcolor="#FBE9E7" shape=vnode_shape style=filled]
+	N10 [label="Cardiovascular Training" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N11 [label="Rehabilitation Exercises" color="#80DDEA" fillcolor="#D3F7F9" shape=database style=filled]
+	N12 [label="Cross_Training" color="#80DDEA" fillcolor="#D3F7F9" shape=inputoutput style=filled]
+	N13 [label="Yoga Instruction" color="#FF8A65" fillcolor="#FBE9E7" shape=predefinedprocess style=filled]
+	N14 [label="Fitness Assessment" color="#A1D7CD" fillcolor="#EDF5F3" shape=inputoutput style=filled]
+	N15 [label="Functional Fitness Training" color="#FF8A65" fillcolor="#FBE9E7" shape=rect style=filled]
+	N16 [label="Nutrition for Fitness" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	N17 [label="Workout Planning" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+	N18 [label="Weightlifting Techniques" color="#A1D7CD" fillcolor="#EDF5F3" shape=rect style=filled]
+	N19 [label="Online Fitness Coaching" color="#A1D7CD" fillcolor="#EDF5F3" shape=action style=filled]
+	N20 [label="Fitness Equipment Maintenance" color="#80DDEA" fillcolor="#D3F7F9" shape=vnode_shape style=filled]
+	S0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Posture Correction {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Posture Correction"
+		nest0_0 [label="Corporate Wellness Programs" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+		nest0_1 [label="Recovery Strategies" color="#A1D7CD" fillcolor="#EDF5F3" shape=preparation style=filled]
+	}
+	subgraph cluster_Youth Fitness Programs {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Youth Fitness Programs"
+		nest1_0 [label="Flexibility Training" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+		nest1_1 [label="HIIT Workouts" color="#A1D7CD" fillcolor="#EDF5F3" shape=document style=filled]
+	}
+	N0 -> N1 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N17 -> N18 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N18 -> N19 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N19 -> N20 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#A1D7CD" penwidth=1.5 style=dashed label="rehabilitates" dir=forward]
+	N4 -> nest0_0 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N15 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N20 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S0 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	S0 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N18 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	M0 -> N5 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N10 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> M1 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	M1 -> N20 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N11 -> M2 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N12 -> M2 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N14 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_255.txt b/test/diagrams/graph_hard/diagrams_255.txt
new file mode 100644
index 0000000000000000000000000000000000000000..00db642ea4c5739df5baa8604d71d634708f06cc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_255.txt
@@ -0,0 +1,26 @@
+<Biometric Feedback Integration, connectedTo, Nutrition for Fitness>
+<Community Fitness Challenges, connectedTo, Strength Training>
+<Community Fitness Challenges, connectedTo, Wearable Fitness Devices>
+<Cross_Training, connectedTo, Fitness Assessment>
+<Cross_Training, connectedTo, Outdoor Fitness Activities>
+<Fitness Assessment, connectedTo, Online Fitness Coaching>
+<Fitness Assessment, connectedTo, Outdoor Fitness Activities>
+<Fitness Assessment, connectedTo, Weightlifting Techniques>
+<Fitness Equipment Maintenance, connectedTo, Fitness Assessment>
+<Home Workout Programs, connectedTo, Workout Tracking Apps>
+<Nutrition for Fitness, connectedTo, Fitness Equipment Maintenance>
+<Online Fitness Coaching, connectedTo, Outdoor Fitness Activities>
+<Outdoor Fitness Activities, connectedTo, Weightlifting Techniques>
+<Pilates Instruction, connectedTo, Cross_Training>
+<Senior Fitness Programs, connectedTo, Personalized Exercise Prescriptions>
+<Senior Fitness Programs, connectedTo, Strength Training>
+<Senior Fitness Programs, connectedTo, Weightlifting Techniques>
+<Senior Fitness Programs, predicts, Online Fitness Coaching>
+<Strength Training, certifies, Pilates Instruction>
+<Strength Training, connectedTo, Biometric Feedback Integration>
+<Strength Training, connectedTo, Outdoor Fitness Activities>
+<Wearable Fitness Devices, connectedTo, Senior Fitness Programs>
+<Wearable Fitness Devices, connectedTo, Strength Training>
+<Weightlifting Techniques, advises, Personalized Exercise Prescriptions>
+<Weightlifting Techniques, connectedTo, Home Workout Programs>
+<Workout Tracking Apps, connectedTo, Personalized Exercise Prescriptions>
diff --git a/test/diagrams/graph_hard/diagrams_256.dot b/test/diagrams/graph_hard/diagrams_256.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a7efc1edd101f1fdef87c3f5d1b945b4de4d8ce9
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_256.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=RL
+	N0 [label="Gut Health for Wellness" color="#CFCFCF" fillcolor="#F6F6F6" shape=parallelogram style=filled]
+	N1 [label="Journaling for Wellness" color="#B8C0F5" fillcolor="#ECF0FD" shape=vnode_shape style=filled]
+	N2 [label="Stress Management" color="#B8C0F5" fillcolor="#ECF0FD" shape=multipledocuments style=filled]
+	N3 [label="Detox Programs" color="#4FC3F7" fillcolor="#E1F5FE" shape=database style=filled]
+	N4 [label="Gratitude Practice" color="#4FC3F7" fillcolor="#E1F5FE" shape=parallelogram style=filled]
+	N5 [label="Financial Wellness Planning" color="#CFCFCF" fillcolor="#F6F6F6" shape=multipledocuments style=filled]
+	N6 [label="Nature Connection" color="#CFCFCF" fillcolor="#F6F6F6" shape=preparation style=filled]
+	N7 [label="Community Wellness Programs" color="#4FC3F7" fillcolor="#E1F5FE" shape=document style=filled]
+	N8 [label="Social Connection Enhancement" color="#B8C0F5" fillcolor="#ECF0FD" shape=multipledocuments style=filled]
+	N9 [label="Positive Psychology Application" color="#B8C0F5" fillcolor="#ECF0FD" shape=rect style=filled]
+	S0 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4FC3F7" fillcolor="#E1F5FE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#4FC3F7" fillcolor="#E1F5FE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Holistic Health Assessment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Holistic Health Assessment"
+		nest0_0 [label="Behavior Change Support" color="#B8C0F5" fillcolor="#ECF0FD" shape=rect style=filled]
+		nest0_1 [label="Meditation Coaching" color="#B8C0F5" fillcolor="#ECF0FD" shape=multipledocuments style=filled]
+		nest0_2 [label="Physical Activity Planning" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	}
+	subgraph cluster_Longevity Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Longevity Planning"
+		nest1_0 [label="Hydrotherapy" color="#CFCFCF" fillcolor="#F6F6F6" shape=action style=filled]
+		nest1_1 [label="Mindfulness Practice" color="#4FC3F7" fillcolor="#E1F5FE" shape=rect style=filled]
+		nest1_2 [label="Resilience Building" color="#B8C0F5" fillcolor="#ECF0FD" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed label="tests" dir=forward]
+	N6 -> N7 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N9 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N7 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S0 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N0 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N2 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N3 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N5 -> S2 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N7 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	S2 -> N9 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N8 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	M0 -> N8 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N7 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_257.dot b/test/diagrams/graph_hard/diagrams_257.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d2fec65397727ca05e3e99aa0b3c8bfd7ee1a6ce
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_257.dot
@@ -0,0 +1,56 @@
+digraph {
+	rankdir=TB
+	N0 [label="Biofeedback Training" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+	N1 [label="Hydrotherapy" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+	N2 [label="Gut Health for Wellness" color="#D3EB9F" fillcolor="#F8FDD3" shape=action style=filled]
+	N3 [label="Alternative Therapies" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N4 [label="Environmental Wellness" color="#7E57C2" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N5 [label="Longevity Planning" color="#7E57C2" fillcolor="#EDE7F6" shape=action style=filled]
+	N6 [label="Acupuncture Consultation" color="#7E57C2" fillcolor="#EDE7F6" shape=rectangle style=filled]
+	N7 [label="Resilience Building" color="#C2B2F0" fillcolor="#EFE6FF" shape=rect style=filled]
+	S0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Behavior Change Support {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Behavior Change Support"
+		nest0_0 [label="Holistic Health Assessment" color="#C2B2F0" fillcolor="#EFE6FF" shape=inputoutput style=filled]
+		nest0_1 [label="Self_Care Routine Development" color="#D3EB9F" fillcolor="#F8FDD3" shape=predefinedprocess style=filled]
+		nest0_2 [label="Sleep Optimization" color="#C2B2F0" fillcolor="#EFE6FF" shape=vnode_shape style=filled]
+		nest0_3 [label="Financial Wellness Planning" color="#C2B2F0" fillcolor="#EFE6FF" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Social Connection Enhancement {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Social Connection Enhancement"
+		nest1_0 [label="Detox Programs" color="#C2B2F0" fillcolor="#EFE6FF" shape=preparation style=filled]
+		nest1_1 [label="Personal Growth Planning" color="#C2B2F0" fillcolor="#EFE6FF" shape=hexagon style=filled]
+		nest1_2 [label="Wellness Retreat Planning" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	}
+	N0 -> N1 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid label="programs" dir=forward]
+	N6 -> N7 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#C2B2F0" penwidth=1.5 style=dashed label="develops" dir=forward]
+	nest0_1 -> nest0_2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N4 [color="#C2B2F0" penwidth=1.5 style=dashed label="improves" dir=forward]
+	N0 -> S0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N3 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N5 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N5 -> M2 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N7 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_257.txt b/test/diagrams/graph_hard/diagrams_257.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d871879ee3afca0509e1c030c9443990e75873e0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_257.txt
@@ -0,0 +1,21 @@
+<Acupuncture Consultation, connectedTo, Detox Programs>
+<Acupuncture Consultation, connectedTo, Resilience Building>
+<Alternative Therapies, connectedTo, Environmental Wellness>
+<Alternative Therapies, connectedTo, Longevity Planning>
+<Alternative Therapies, connectedTo, Resilience Building>
+<Biofeedback Training, connectedTo, Alternative Therapies>
+<Biofeedback Training, connectedTo, Hydrotherapy>
+<Biofeedback Training, connectedTo, Longevity Planning>
+<Detox Programs, connectedTo, Personal Growth Planning>
+<Environmental Wellness, connectedTo, Longevity Planning>
+<Financial Wellness Planning, connectedTo, Environmental Wellness>
+<Gut Health for Wellness, connectedTo, Alternative Therapies>
+<Gut Health for Wellness, connectedTo, Holistic Health Assessment>
+<Holistic Health Assessment, develops, Self_Care Routine Development>
+<Hydrotherapy, connectedTo, Gut Health for Wellness>
+<Longevity Planning, connectedTo, Resilience Building>
+<Longevity Planning, programs, Acupuncture Consultation>
+<Personal Growth Planning, connectedTo, Wellness Retreat Planning>
+<Self_Care Routine Development, connectedTo, Sleep Optimization>
+<Sleep Optimization, connectedTo, Financial Wellness Planning>
+<Wellness Retreat Planning, improves, Environmental Wellness>
diff --git a/test/diagrams/graph_hard/diagrams_258.txt b/test/diagrams/graph_hard/diagrams_258.txt
new file mode 100644
index 0000000000000000000000000000000000000000..04912d48c4f48a037cdb4303413d4710565e903e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_258.txt
@@ -0,0 +1,31 @@
+<Acupuncture Consultation, connectedTo, Spiritual Exploration>
+<Breathwork Exercises, connectedTo, Gratitude Practice>
+<Chiropractic Care, connectedTo, Biofeedback Training>
+<Chiropractic Care, connectedTo, Massage Therapy>
+<Chiropractic Care, connectedTo, Resilience Building>
+<Digital Detox, connectedTo, Gratitude Practice>
+<Digital Detox, guides, Breathwork Exercises>
+<Digital Detox, motivates, Emotional Well_being>
+<Emotional Well_being, connectedTo, Stress Management>
+<Environmental Wellness, connectedTo, Resilience Building>
+<Gratitude Practice, connectedTo, Hydrotherapy>
+<Holistic Health Assessment, connectedTo, Self_Care Routine Development>
+<Hydrotherapy, connectedTo, Immune System Support>
+<Hydrotherapy, connectedTo, Resilience Building>
+<Immune System Support, connectedTo, Holistic Health Assessment>
+<Immune System Support, connectedTo, Resilience Building>
+<Massage Therapy, connectedTo, Resilience Building>
+<Personal Growth Planning, connectedTo, Environmental Wellness>
+<Positive Psychology Application, connectedTo, Acupuncture Consultation>
+<Positive Psychology Application, connectedTo, Digital Detox>
+<Positive Psychology Application, connectedTo, Gratitude Practice>
+<Resilience Building, connectedTo, Biofeedback Training>
+<Self_Care Routine Development, connectedTo, Massage Therapy>
+<Self_Care Routine Development, connectedTo, Resilience Building>
+<Self_Care Routine Development, connectedTo, Work_Life Balance Coaching>
+<Self_Care Routine Development, licenses, Chiropractic Care>
+<Sleep Optimization, connectedTo, Gratitude Practice>
+<Sleep Optimization, connectedTo, Positive Psychology Application>
+<Spiritual Exploration, connectedTo, Positive Psychology Application>
+<Stress Management, advises, Personal Growth Planning>
+<Work_Life Balance Coaching, connectedTo, Chiropractic Care>
diff --git a/test/diagrams/graph_hard/diagrams_259.txt b/test/diagrams/graph_hard/diagrams_259.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c3af25be4621446a555b77c0c771f367f205bc19
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_259.txt
@@ -0,0 +1,30 @@
+<3D Rendering, connectedTo, Construction Documentation>
+<3D Rendering, connectedTo, Site Measurement>
+<Acoustic Treatment, connectedTo, Commercial Interior Design>
+<Acoustic Treatment, connectedTo, Sustainable Design Practices>
+<Budget Management, connectedTo, Construction Documentation>
+<Budget Management, connectedTo, Furniture Selection>
+<Building Code Compliance, connectedTo, Hospitality Interior Design>
+<CAD Drafting, connectedTo, 3D Rendering>
+<Commercial Interior Design, connectedTo, Bathroom Design>
+<Commercial Interior Design, connectedTo, Construction Documentation>
+<Commercial Interior Design, connectedTo, Wall Treatment Selection>
+<Commercial Interior Design, spaces, Hospitality Interior Design>
+<Concept Development, connectedTo, Office Space Design>
+<Construction Documentation, connectedTo, Bathroom Design>
+<Furniture Selection, connectedTo, CAD Drafting>
+<Hospitality Interior Design, connectedTo, Commercial Interior Design>
+<Living Room Design, connectedTo, Residential Interior Design>
+<Mood Board Creation, connectedTo, CAD Drafting>
+<Mood Board Creation, connectedTo, Site Measurement>
+<Mood Board Creation, styles, Living Room Design>
+<Office Space Design, connectedTo, Building Code Compliance>
+<Residential Interior Design, connectedTo, Concept Development>
+<Site Measurement, connectedTo, Living Room Design>
+<Site Measurement, lights, Office Space Design>
+<Space Planning, connectedTo, Building Code Compliance>
+<Sustainable Design Practices, connectedTo, Space Planning>
+<Textile and Fabric Selection, connectedTo, Mood Board Creation>
+<Universal Design Principles, connectedTo, Budget Management>
+<Wall Treatment Selection, connectedTo, Acoustic Treatment>
+<Wall Treatment Selection, connectedTo, Universal Design Principles>
diff --git a/test/diagrams/graph_hard/diagrams_26.dot b/test/diagrams/graph_hard/diagrams_26.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0fb15b9e995c1dfa5f2c9226df93f5714216c03d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_26.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Container Loading" color="#E91E63" fillcolor="#F8BBD0" shape=diamond style=filled]
+	N1 [label="Route Optimization Software" color="#EAEFA5" fillcolor="#FDFCEB" shape=preparation style=filled]
+	N2 [label="Route Assignment" color="#E91E63" fillcolor="#F8BBD0" shape=predefinedprocess style=filled]
+	N3 [label="Packing Process" color="#E91E63" fillcolor="#F8BBD0" shape=action style=filled]
+	N4 [label="Freight Booking" color="#42A5F5" fillcolor="#F1F8FF" shape=inputoutput style=filled]
+	N5 [label="Sorting Center" color="#E91E63" fillcolor="#F8BBD0" shape=predefinedprocess style=filled]
+	N6 [label="Deconsolidation" color="#EAEFA5" fillcolor="#FDFCEB" shape=parallelogram style=filled]
+	N7 [label="Barcode Scanning" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N8 [label="Pallet Stacking" color="#42A5F5" fillcolor="#F1F8FF" shape=document style=filled]
+	N9 [label="Consolidation" color="#EAEFA5" fillcolor="#FDFCEB" shape=action style=filled]
+	N10 [label="Delay Notification" color="#E91E63" fillcolor="#F8BBD0" shape=inputoutput style=filled]
+	S0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#42A5F5" fillcolor="#F1F8FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#E91E63" fillcolor="#F8BBD0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Carrier Selection {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Carrier Selection"
+		nest0_0 [label="Vehicle Loading" color="#E91E63" fillcolor="#F8BBD0" shape=rect style=filled]
+		nest0_1 [label="Cross_docking" color="#EAEFA5" fillcolor="#FDFCEB" shape=database style=filled]
+		nest0_2 [label="Proof of Delivery" color="#42A5F5" fillcolor="#F1F8FF" shape=multipledocuments style=filled]
+		nest0_3 [label="Hub Transfer" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	}
+	subgraph cluster_Pickup Request {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Pickup Request"
+		nest1_0 [label="Global Trade Compliance" color="#42A5F5" fillcolor="#F1F8FF" shape=predefinedprocess style=filled]
+		nest1_1 [label="Ocean Freight Management" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+		nest1_2 [label="Fleet Maintenance Scheduling" color="#42A5F5" fillcolor="#F1F8FF" shape=rectangle style=filled]
+		nest1_3 [label="Customs Clearance" color="#E91E63" fillcolor="#F8BBD0" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid label="stacks" dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#E91E63" penwidth=1.5 style=solid label="stores" dir=forward]
+	nest0_1 -> nest0_2 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest0_0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N10 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N4 [color="#000000" penwidth=1.5 style=solid label="optimizes" dir=forward]
+	S0 -> N8 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N1 -> S2 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#E91E63" penwidth=1.5 style=solid label="verifies" dir=forward]
+	S2 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=dashed label="communicates" dir=forward]
+	M0 -> N10 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N4 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_26.txt b/test/diagrams/graph_hard/diagrams_26.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1726b475e540d0b7f75929fa33b8594a829c4a6d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_26.txt
@@ -0,0 +1,33 @@
+<Barcode Scanning, stacks, Pallet Stacking>
+<Consolidation, connectedTo, Delay Notification>
+<Container Loading, connectedTo, Freight Booking>
+<Container Loading, connectedTo, Route Optimization Software>
+<Cross_docking, connectedTo, Proof of Delivery>
+<Customs Clearance, connectedTo, Sorting Center>
+<Deconsolidation, connectedTo, Barcode Scanning>
+<Deconsolidation, connectedTo, Delay Notification>
+<Fleet Maintenance Scheduling, connectedTo, Customs Clearance>
+<Freight Booking, connectedTo, Sorting Center>
+<Global Trade Compliance, connectedTo, Ocean Freight Management>
+<Hub Transfer, connectedTo, Delay Notification>
+<Ocean Freight Management, connectedTo, Fleet Maintenance Scheduling>
+<Packing Process, communicates, Delay Notification>
+<Packing Process, connectedTo, Freight Booking>
+<Pallet Stacking, connectedTo, Consolidation>
+<Pallet Stacking, connectedTo, Global Trade Compliance>
+<Proof of Delivery, connectedTo, Hub Transfer>
+<Route Assignment, connectedTo, Barcode Scanning>
+<Route Assignment, connectedTo, Deconsolidation>
+<Route Assignment, connectedTo, Delay Notification>
+<Route Assignment, connectedTo, Freight Booking>
+<Route Assignment, connectedTo, Packing Process>
+<Route Assignment, connectedTo, Pallet Stacking>
+<Route Assignment, optimizes, Freight Booking>
+<Route Optimization Software, connectedTo, Delay Notification>
+<Route Optimization Software, connectedTo, Freight Booking>
+<Route Optimization Software, connectedTo, Route Assignment>
+<Route Optimization Software, connectedTo, Vehicle Loading>
+<Route Optimization Software, verifies, Pallet Stacking>
+<Sorting Center, connectedTo, Deconsolidation>
+<Sorting Center, connectedTo, Delay Notification>
+<Vehicle Loading, stores, Cross_docking>
diff --git a/test/diagrams/graph_hard/diagrams_260.dot b/test/diagrams/graph_hard/diagrams_260.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d60e9970bb7662afdb754353f38d8c6618773b24
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_260.dot
@@ -0,0 +1,57 @@
+digraph {
+	rankdir=BT
+	N0 [label="Building Code Compliance" color="#FFD54F" fillcolor="#FFF8E1" shape=document style=filled]
+	N1 [label="Universal Design Principles" color="#A1D7CD" fillcolor="#EDF5F3" shape=inputoutput style=filled]
+	N2 [label="Material and Finish Specification" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+	N3 [label="Hospitality Interior Design" color="#FFD54F" fillcolor="#FFF8E1" shape=predefinedprocess style=filled]
+	N4 [label="CAD Drafting" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N5 [label="Textile and Fabric Selection" color="#FFD54F" fillcolor="#FFF8E1" shape=multipledocuments style=filled]
+	N6 [label="Construction Documentation" color="#FFD54F" fillcolor="#FFF8E1" shape=predefinedprocess style=filled]
+	N7 [label="Site Measurement" color="#FFC2C2" fillcolor="#FFEBEB" shape=rect style=filled]
+	S0 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Flooring Specification {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Flooring Specification"
+		nest0_0 [label="Wall Treatment Selection" color="#FFC2C2" fillcolor="#FFEBEB" shape=rect style=filled]
+		nest0_1 [label="Ergonomics Integration" color="#FFC2C2" fillcolor="#FFEBEB" shape=rectangle style=filled]
+		nest0_2 [label="Color Scheme Selection" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	}
+	subgraph cluster_Office Space Design {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Office Space Design"
+		nest1_0 [label="3D Rendering" color="#FFD54F" fillcolor="#FFF8E1" shape=rectangle style=filled]
+		nest1_1 [label="Space Planning" color="#FFC2C2" fillcolor="#FFEBEB" shape=inputoutput style=filled]
+		nest1_2 [label="Acoustic Treatment" color="#A1D7CD" fillcolor="#EDF5F3" shape=document style=filled]
+		nest1_3 [label="Client Consultation" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	}
+	N0 -> N1 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N6 [color="#A1D7CD" penwidth=1.5 style=dashed label="procures" dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N7 [color="#A1D7CD" penwidth=1.5 style=solid label="certifies" dir=forward]
+	N2 -> S0 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#FFD54F" penwidth=1.5 style=dashed label="transforms" dir=forward]
+	S0 -> N6 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=dashed label="spaces" dir=forward]
+	M1 -> N6 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_261.txt b/test/diagrams/graph_hard/diagrams_261.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1a712bb15851862c51992b6f8781ec3a1c36e9d4
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_261.txt
@@ -0,0 +1,28 @@
+<3D Rendering, connectedTo, Retail Interior Design>
+<3D Rendering, connectedTo, Space Planning>
+<Acoustic Treatment, connectedTo, Space Planning>
+<Budget Management, connectedTo, Ergonomics Integration>
+<CAD Drafting, connectedTo, Hospitality Interior Design>
+<Client Consultation, measures, 3D Rendering>
+<Commercial Interior Design, connectedTo, Budget Management>
+<Concept Development, connectedTo, Client Consultation>
+<Concept Development, connectedTo, Ventilation Planning>
+<Concept Development, surveys, Contractor Coordination>
+<Contractor Coordination, markets, Wall Treatment Selection>
+<Ergonomics Integration, connectedTo, 3D Rendering>
+<Ergonomics Integration, connectedTo, CAD Drafting>
+<Ergonomics Integration, connectedTo, Installation Supervision>
+<Feng Shui Consultation, connectedTo, Concept Development>
+<Hospitality Interior Design, connectedTo, 3D Rendering>
+<Hospitality Interior Design, connectedTo, Client Consultation>
+<Hospitality Interior Design, connectedTo, Installation Supervision>
+<Installation Supervision, connectedTo, Client Consultation>
+<Kitchen Design, connectedTo, Budget Management>
+<Office Space Design, connectedTo, Commercial Interior Design>
+<Retail Interior Design, connectedTo, Acoustic Treatment>
+<Sustainable Design Practices, connectedTo, Client Consultation>
+<Sustainable Design Practices, connectedTo, Kitchen Design>
+<Ventilation Planning, connectedTo, Office Space Design>
+<Wall Treatment Selection, certifies, Installation Supervision>
+<Wall Treatment Selection, connectedTo, Hospitality Interior Design>
+<Wall Treatment Selection, connectedTo, Sustainable Design Practices>
diff --git a/test/diagrams/graph_hard/diagrams_262.dot b/test/diagrams/graph_hard/diagrams_262.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ad1a420f7c7798e76625380f8614df92aafd6fad
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_262.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=RL
+	N0 [label="Simultaneous Interpretation" color="#673AB7" fillcolor="#D1C4E9" shape=rectangle style=filled]
+	N1 [label="Domain_Specific Translation Models" color="#673AB7" fillcolor="#D1C4E9" shape=rectangle style=filled]
+	N2 [label="Continuous Learning Models for Translation" color="#A1887F" fillcolor="#EFEBE9" shape=inputoutput style=filled]
+	N3 [label="Cross_Lingual Communication" color="#6FE1D5" fillcolor="#C9EFEC" shape=parallelogram style=filled]
+	N4 [label="Speaker Diarization" color="#A1887F" fillcolor="#EFEBE9" shape=preparation style=filled]
+	N5 [label="Speech Recognition" color="#6FE1D5" fillcolor="#C9EFEC" shape=rectangle style=filled]
+	N6 [label="Customer Support Translation" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+	N7 [label="Dialect Recognition" color="#673AB7" fillcolor="#D1C4E9" shape=rectangle style=filled]
+	S0 [label="" color="#A1887F" fillcolor="#EFEBE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#A1887F" fillcolor="#EFEBE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A1887F" fillcolor="#EFEBE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A1887F" fillcolor="#EFEBE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Consecutive Interpretation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Consecutive Interpretation"
+		nest0_0 [label="Meeting Translation Systems" color="#673AB7" fillcolor="#D1C4E9" shape=predefinedprocess style=filled]
+		nest0_1 [label="Real_Time Captioning" color="#673AB7" fillcolor="#D1C4E9" shape=inputoutput style=filled]
+		nest0_2 [label="Glossary Management" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	}
+	subgraph cluster_Tone Recognition {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Tone Recognition"
+		nest1_0 [label="Emotion Detection in Speech" color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+		nest1_1 [label="Subtitling Generation" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+		nest1_2 [label="Medical Translation" color="#673AB7" fillcolor="#D1C4E9" shape=diamond style=filled]
+		nest1_3 [label="Voice Biometrics" color="#673AB7" fillcolor="#D1C4E9" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#673AB7" penwidth=1.5 style=dashed label="synthesizes" dir=forward]
+	N6 -> N7 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest0_0 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N4 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N2 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#A1887F" penwidth=1.5 style=solid label="customizes" dir=forward]
+	S0 -> N4 [color="#6FE1D5" penwidth=1.5 style=solid label="monitors" dir=forward]
+	S0 -> N5 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N0 -> S2 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	M0 -> N5 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#A1887F" penwidth=1.5 style=dashed label="develops" dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N7 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N5 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	M2 -> N7 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_263.dot b/test/diagrams/graph_hard/diagrams_263.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d32a6f3b358cd6647caf97665ebdbb3d024a47dd
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_263.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=RL
+	N0 [label="Continuous Learning Models for Translation" color="#BCB88A" fillcolor="#F5F5DC" shape=vnode_shape style=filled]
+	N1 [label="Custom Vocabulary Integration" color="#BCB88A" fillcolor="#F5F5DC" shape=document style=filled]
+	N2 [label="Medical Translation" color="#BCB88A" fillcolor="#F5F5DC" shape=database style=filled]
+	N3 [label="Text_to_Speech Synthesis" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N4 [label="Subtitling Generation" color="#FFE470" fillcolor="#FFFAE0" shape=predefinedprocess style=filled]
+	N5 [label="Speech Recognition" color="#FFE470" fillcolor="#FFFAE0" shape=multipledocuments style=filled]
+	N6 [label="API Integration for Translation Services" color="#FFE470" fillcolor="#FFFAE0" shape=preparation style=filled]
+	N7 [label="Contextual Understanding" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N8 [label="Machine Translation Engine" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N9 [label="Meeting Translation Systems" color="#FFC107" fillcolor="#FFECB3" shape=rectangle style=filled]
+	N10 [label="Statistical Machine Translation" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N11 [label="Low_Latency Processing" color="#FFE470" fillcolor="#FFFAE0" shape=rect style=filled]
+	N12 [label="Data Security for Translated Content" color="#FFC107" fillcolor="#FFECB3" shape=rect style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFC107" fillcolor="#FFECB3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Legal Document Translation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Legal Document Translation"
+		nest0_0 [label="Wearable Translation Devices" color="#FFE470" fillcolor="#FFFAE0" shape=action style=filled]
+		nest0_1 [label="Social Media Translation" color="#FFC107" fillcolor="#FFECB3" shape=rectangle style=filled]
+		nest0_2 [label="Real_Time Document Translation" color="#FFE470" fillcolor="#FFFAE0" shape=document style=filled]
+		nest0_3 [label="Cross_Lingual Communication" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	}
+	subgraph cluster_Dialect Recognition {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Dialect Recognition"
+		nest1_0 [label="Customer Support Translation" color="#FFE470" fillcolor="#FFFAE0" shape=predefinedprocess style=filled]
+		nest1_1 [label="Voice Biometrics" color="#BCB88A" fillcolor="#F5F5DC" shape=database style=filled]
+		nest1_2 [label="Noise Reduction for Speech Input" color="#BCB88A" fillcolor="#F5F5DC" shape=preparation style=filled]
+		nest1_3 [label="Neural Machine Translation" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#FFC107" penwidth=1.5 style=dashed label="supports" dir=forward]
+	nest0_3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N3 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S0 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#FFC107" penwidth=1.5 style=solid label="connects" dir=forward]
+	N4 -> S1 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S2 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#000000" penwidth=1.5 style=solid label="tracks" dir=forward]
+	S2 -> N2 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N8 -> M0 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N10 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid label="learns" dir=forward]
+	M1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_264.dot b/test/diagrams/graph_hard/diagrams_264.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f3bb6ad80603ec85dffc9304f380759f9f70b928
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_264.dot
@@ -0,0 +1,85 @@
+digraph {
+	rankdir=BT
+	N0 [label="Multimodal Translation" color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N1 [label="Speech Recognition" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N2 [label="Rule_Based Machine Translation" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+	N3 [label="Glossary Management" color="#FFB74D" fillcolor="#FFF3E0" shape=predefinedprocess style=filled]
+	N4 [label="Cross_Lingual Communication" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N5 [label="Statistical Machine Translation" color="#CB9BE1" fillcolor="#F2E6F5" shape=preparation style=filled]
+	N6 [label="Meeting Translation Systems" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N7 [label="Neural Machine Translation" color="#42A5F5" fillcolor="#F1F8FF" shape=multipledocuments style=filled]
+	N8 [label="Subtitling Generation" color="#42A5F5" fillcolor="#F1F8FF" shape=predefinedprocess style=filled]
+	N9 [label="Pronunciation Correction" color="#42A5F5" fillcolor="#F1F8FF" shape=inputoutput style=filled]
+	N10 [label="Sentiment Analysis in Translation" color="#42A5F5" fillcolor="#F1F8FF" shape=action style=filled]
+	N11 [label="Text_to_Speech Synthesis" color="#42A5F5" fillcolor="#F1F8FF" shape=action style=filled]
+	N12 [label="Consecutive Interpretation" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N13 [label="Tone Recognition" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N14 [label="Noise Reduction for Speech Input" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N15 [label="Machine Translation Engine" color="#CB9BE1" fillcolor="#F2E6F5" shape=diamond style=filled]
+	N16 [label="Legal Document Translation" color="#FFB74D" fillcolor="#FFF3E0" shape=preparation style=filled]
+	N17 [label="Custom Vocabulary Integration" color="#FFB74D" fillcolor="#FFF3E0" shape=database style=filled]
+	N18 [label="Live Event Translation" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N19 [label="Wearable Translation Devices" color="#42A5F5" fillcolor="#F1F8FF" shape=action style=filled]
+	N20 [label="Real_Time Document Translation" color="#CB9BE1" fillcolor="#F2E6F5" shape=document style=filled]
+	S0 [label="" color="#FFB74D" fillcolor="#FFF3E0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#42A5F5" fillcolor="#F1F8FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_API Integration for Translation Services {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="API Integration for Translation Services"
+		nest0_0 [label="Dialect Recognition" color="#42A5F5" fillcolor="#F1F8FF" shape=rect style=filled]
+		nest0_1 [label="Speaker Diarization" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	}
+	subgraph cluster_Continuous Learning Models for Translation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Continuous Learning Models for Translation"
+		nest1_0 [label="Real_Time Captioning" color="#CB9BE1" fillcolor="#F2E6F5" shape=preparation style=filled]
+		nest1_1 [label="Medical Translation" color="#42A5F5" fillcolor="#F1F8FF" shape=action style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#CB9BE1" penwidth=1.5 style=solid label="streams" dir=forward]
+	N13 -> N14 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N17 -> N18 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N18 -> N19 [color="#42A5F5" penwidth=1.5 style=solid label="outputs" dir=forward]
+	N19 -> N20 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest0_0 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest1_0 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N1 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N14 -> S0 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S0 -> N16 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S0 -> N18 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N19 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N20 [color="#42A5F5" penwidth=1.5 style=solid label="synthesizes" dir=forward]
+	N5 -> S1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N18 [color="#42A5F5" penwidth=1.5 style=solid label="supports" dir=forward]
+	S1 -> N17 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N12 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N13 -> M1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N14 -> M1 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N10 -> M1 [color="#FFB74D" penwidth=1.5 style=solid label="optimizes" dir=forward]
+	M1 -> N18 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_267.dot b/test/diagrams/graph_hard/diagrams_267.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2ba0dfd99115704128419e5dc504db3e649660b5
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_267.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=LR
+	N0 [label="Data Processing from Drones" color="#AED581" fillcolor="#F0F4C3" shape=inputoutput style=filled]
+	N1 [label="Flight Planning Software" color="#9FA9E1" fillcolor="#D6D9F0" shape=vnode_shape style=filled]
+	N2 [label="3D Modeling from Drone Data" color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+	N3 [label="Precision Agriculture" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N4 [label="Propulsion System Development" color="#9FA9E1" fillcolor="#D6D9F0" shape=preparation style=filled]
+	N5 [label="Autonomous Flight" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N6 [label="Thermal Imaging with Drones" color="#AED581" fillcolor="#F0F4C3" shape=document style=filled]
+	N7 [label="Drone Maintenance" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N8 [label="Collision Avoidance Systems" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N9 [label="Sensor Integration" color="#AED581" fillcolor="#F0F4C3" shape=action style=filled]
+	N10 [label="Wildlife Tracking" color="#AED581" fillcolor="#F0F4C3" shape=inputoutput style=filled]
+	M0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Swarm Robotics for Drones {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Swarm Robotics for Drones"
+		nest0_0 [label="Payload Customization" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+		nest0_1 [label="Ethical Drone Use" color="#9FA9E1" fillcolor="#D6D9F0" shape=preparation style=filled]
+	}
+	subgraph cluster_Mapping and Surveying {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Mapping and Surveying"
+		nest1_0 [label="Drone Delivery Logistics" color="#FFF8A6" fillcolor="#FFFDE0" shape=rectangle style=filled]
+		nest1_1 [label="Environmental Monitoring" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+		nest1_2 [label="Drone Design" color="#AED581" fillcolor="#F0F4C3" shape=predefinedprocess style=filled]
+		nest1_3 [label="Battery Management System" color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest0_0 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N10 [color="#000000" penwidth=1.5 style=dashed label="permits" dir=forward]
+	nest1_0 -> nest1_1 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N5 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	M1 -> N10 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N6 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N0 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_267.txt b/test/diagrams/graph_hard/diagrams_267.txt
new file mode 100644
index 0000000000000000000000000000000000000000..18273df0e8de1336b8b4d7eed64610b6bd6efeb2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_267.txt
@@ -0,0 +1,27 @@
+<3D Modeling from Drone Data, connectedTo, Precision Agriculture>
+<Autonomous Flight, connectedTo, Drone Design>
+<Autonomous Flight, connectedTo, Sensor Integration>
+<Autonomous Flight, connectedTo, Thermal Imaging with Drones>
+<Autonomous Flight, connectedTo, Wildlife Tracking>
+<Battery Management System, connectedTo, Autonomous Flight>
+<Collision Avoidance Systems, connectedTo, Sensor Integration>
+<Data Processing from Drones, connectedTo, Flight Planning Software>
+<Data Processing from Drones, connectedTo, Wildlife Tracking>
+<Drone Delivery Logistics, connectedTo, Environmental Monitoring>
+<Drone Design, connectedTo, Battery Management System>
+<Drone Maintenance, connectedTo, Collision Avoidance Systems>
+<Drone Maintenance, connectedTo, Drone Delivery Logistics>
+<Environmental Monitoring, connectedTo, Autonomous Flight>
+<Environmental Monitoring, connectedTo, Battery Management System>
+<Environmental Monitoring, connectedTo, Drone Design>
+<Ethical Drone Use, permits, Wildlife Tracking>
+<Flight Planning Software, connectedTo, 3D Modeling from Drone Data>
+<Flight Planning Software, connectedTo, Sensor Integration>
+<Payload Customization, connectedTo, Ethical Drone Use>
+<Precision Agriculture, connectedTo, Data Processing from Drones>
+<Precision Agriculture, connectedTo, Propulsion System Development>
+<Propulsion System Development, connectedTo, Autonomous Flight>
+<Sensor Integration, connectedTo, Payload Customization>
+<Sensor Integration, connectedTo, Wildlife Tracking>
+<Thermal Imaging with Drones, connectedTo, Drone Maintenance>
+<Thermal Imaging with Drones, connectedTo, Sensor Integration>
diff --git a/test/diagrams/graph_hard/diagrams_268.dot b/test/diagrams/graph_hard/diagrams_268.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ec386d71d0aa3916fe5e4648fcd3053de89495da
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_268.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=BT
+	N0 [label="Adaptive Cruise Control" color="#CB9BE1" fillcolor="#F2E6F5" shape=document style=filled]
+	N1 [label="Hardware Design" color="#A188D0" fillcolor="#DACBE3" shape=parallelogram style=filled]
+	N2 [label="Pedestrian Detection" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N3 [label="Motion Control" color="#A188D0" fillcolor="#DACBE3" shape=multipledocuments style=filled]
+	N4 [label="Charging Infrastructure" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N5 [label="Redundancy in Sensors" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N6 [label="Remote Operation Capability" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N7 [label="Battery Management for EVs" color="#A188D0" fillcolor="#DACBE3" shape=preparation style=filled]
+	N8 [label="Cloud Connectivity for AVs" color="#CB9BE1" fillcolor="#F2E6F5" shape=predefinedprocess style=filled]
+	N9 [label="Perception System" color="#CB9BE1" fillcolor="#F2E6F5" shape=multipledocuments style=filled]
+	N10 [label="Decision_Making Algorithms" color="#388E3C" fillcolor="#F1F8E9" shape=rect style=filled]
+	N11 [label="Automatic Emergency Braking" color="#A188D0" fillcolor="#DACBE3" shape=inputoutput style=filled]
+	N12 [label="Vehicle Diagnostics" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+	N13 [label="Insurance Models for AVs" color="#388E3C" fillcolor="#F1F8E9" shape=predefinedprocess style=filled]
+	N14 [label="Over_the_Air Updates" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	S0 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Regulatory Compliance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Regulatory Compliance"
+		nest0_0 [label="Traffic Sign Recognition" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+		nest0_1 [label="Data Collection and Annotation" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+	}
+	subgraph cluster_Path Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Path Planning"
+		nest1_0 [label="Simulation and Testing" color="#CB9BE1" fillcolor="#F2E6F5" shape=predefinedprocess style=filled]
+		nest1_1 [label="Fleet Management" color="#A188D0" fillcolor="#DACBE3" shape=predefinedprocess style=filled]
+		nest1_2 [label="Driver Monitoring Systems" color="#388E3C" fillcolor="#F1F8E9" shape=vnode_shape style=filled]
+		nest1_3 [label="Predictive Maintenance" color="#CB9BE1" fillcolor="#F2E6F5" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#A188D0" penwidth=1.5 style=solid label="optimizes" dir=forward]
+	N11 -> N12 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#388E3C" penwidth=1.5 style=solid label="designs" dir=forward]
+	N13 -> N14 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N9 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N5 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N10 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N14 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S2 -> N13 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N12 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	M2 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_269.dot b/test/diagrams/graph_hard/diagrams_269.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b6ed7e36aaa5465203cf9c06ab1399f349d099cc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_269.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=BT
+	N0 [label="Predictive Maintenance" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+	N1 [label="Object Detection and Classification" color="#FFC2C2" fillcolor="#FFEBEB" shape=inputoutput style=filled]
+	N2 [label="Insurance Models for AVs" color="#DCE775" fillcolor="#FCFCE7" shape=preparation style=filled]
+	N3 [label="Fail_Safe Systems" color="#DCE775" fillcolor="#FCFCE7" shape=database style=filled]
+	N4 [label="Battery Management for EVs" color="#DCE775" fillcolor="#FCFCE7" shape=database style=filled]
+	N5 [label="Accident Reconstruction for AVs" color="#FFC2C2" fillcolor="#FFEBEB" shape=document style=filled]
+	N6 [label="Automatic Emergency Braking" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N7 [label="Ethical Decision_Making" color="#DCE775" fillcolor="#FCFCE7" shape=document style=filled]
+	N8 [label="Localization and Mapping" color="#FFC2C2" fillcolor="#FFEBEB" shape=predefinedprocess style=filled]
+	N9 [label="Parking Assistance Systems" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+	N10 [label="Sensor Integration" color="#FFC2C2" fillcolor="#FFEBEB" shape=document style=filled]
+	N11 [label="Vehicle_to_Vehicle Communication" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N12 [label="Cloud Connectivity for AVs" color="#DCE775" fillcolor="#FCFCE7" shape=database style=filled]
+	N13 [label="Edge Computing for AVs" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N14 [label="Lane Keeping Assist" color="#FFC2C2" fillcolor="#FFEBEB" shape=database style=filled]
+	S0 [label="" color="#DCE775" fillcolor="#FCFCE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Simulation Environment Development {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Simulation Environment Development"
+		nest0_0 [label="Fleet Management" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest0_1 [label="Software Development" color="#FFC2C2" fillcolor="#FFEBEB" shape=predefinedprocess style=filled]
+		nest0_2 [label="Over_the_Air Updates" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Perception System {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Perception System"
+		nest1_0 [label="Traffic Sign Recognition" color="#CB9BE1" fillcolor="#F2E6F5" shape=vnode_shape style=filled]
+		nest1_1 [label="Path Planning" color="#DCE775" fillcolor="#FCFCE7" shape=preparation style=filled]
+		nest1_2 [label="Motion Control" color="#FFC2C2" fillcolor="#FFEBEB" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#DCE775" penwidth=1.5 style=solid label="plans" dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed label="localizes" dir=forward]
+	N7 -> N8 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed label="regulates" dir=forward]
+	N10 -> N11 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest0_0 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N9 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FFC2C2" penwidth=1.5 style=dashed label="detects" dir=forward]
+	nest1_1 -> nest1_2 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N10 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N6 -> S0 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#DCE775" penwidth=1.5 style=dashed label="navigates" dir=forward]
+	S0 -> N13 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=dashed label="monitors" dir=forward]
+	N3 -> M0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#CB9BE1" penwidth=1.5 style=solid label="learns" dir=forward]
+	M0 -> N10 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N6 -> M1 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	M1 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	M2 -> N4 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_269.txt b/test/diagrams/graph_hard/diagrams_269.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cad8c65c0bdcc10dfe9df6aa75b5301f349a2dea
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_269.txt
@@ -0,0 +1,34 @@
+<Accident Reconstruction for AVs, connectedTo, Fleet Management>
+<Accident Reconstruction for AVs, plans, Automatic Emergency Braking>
+<Automatic Emergency Braking, connectedTo, Cloud Connectivity for AVs>
+<Automatic Emergency Braking, connectedTo, Edge Computing for AVs>
+<Automatic Emergency Braking, connectedTo, Vehicle_to_Vehicle Communication>
+<Automatic Emergency Braking, learns, Sensor Integration>
+<Automatic Emergency Braking, localizes, Ethical Decision_Making>
+<Automatic Emergency Braking, navigates, Lane Keeping Assist>
+<Battery Management for EVs, connectedTo, Accident Reconstruction for AVs>
+<Cloud Connectivity for AVs, connectedTo, Edge Computing for AVs>
+<Edge Computing for AVs, connectedTo, Lane Keeping Assist>
+<Ethical Decision_Making, connectedTo, Localization and Mapping>
+<Fail_Safe Systems, connectedTo, Battery Management for EVs>
+<Fail_Safe Systems, connectedTo, Cloud Connectivity for AVs>
+<Fail_Safe Systems, connectedTo, Sensor Integration>
+<Fleet Management, connectedTo, Software Development>
+<Insurance Models for AVs, connectedTo, Automatic Emergency Braking>
+<Insurance Models for AVs, connectedTo, Battery Management for EVs>
+<Insurance Models for AVs, connectedTo, Fail_Safe Systems>
+<Insurance Models for AVs, connectedTo, Vehicle_to_Vehicle Communication>
+<Insurance Models for AVs, monitors, Sensor Integration>
+<Localization and Mapping, connectedTo, Parking Assistance Systems>
+<Motion Control, connectedTo, Sensor Integration>
+<Object Detection and Classification, connectedTo, Battery Management for EVs>
+<Object Detection and Classification, connectedTo, Insurance Models for AVs>
+<Over_the_Air Updates, connectedTo, Parking Assistance Systems>
+<Parking Assistance Systems, connectedTo, Traffic Sign Recognition>
+<Parking Assistance Systems, regulates, Sensor Integration>
+<Path Planning, connectedTo, Motion Control>
+<Predictive Maintenance, connectedTo, Object Detection and Classification>
+<Sensor Integration, connectedTo, Vehicle_to_Vehicle Communication>
+<Software Development, connectedTo, Over_the_Air Updates>
+<Traffic Sign Recognition, detects, Path Planning>
+<Vehicle_to_Vehicle Communication, connectedTo, Cloud Connectivity for AVs>
diff --git a/test/diagrams/graph_hard/diagrams_27.dot b/test/diagrams/graph_hard/diagrams_27.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d11ffd46dcf83ea3ee2f05238c8775f1ac83ccec
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_27.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=BT
+	N0 [label="Fleet Maintenance Scheduling" color="#80DDEA" fillcolor="#D3F7F9" shape=action style=filled]
+	N1 [label="Sorting Center" color="#4FC3F7" fillcolor="#E1F5FE" shape=multipledocuments style=filled]
+	N2 [label="Carrier Selection" color="#4FC3F7" fillcolor="#E1F5FE" shape=database style=filled]
+	N3 [label="Invoice Matching" color="#80DDEA" fillcolor="#D3F7F9" shape=inputoutput style=filled]
+	N4 [label="Demand Forecasting Integration" color="#4FC3F7" fillcolor="#E1F5FE" shape=hexagon style=filled]
+	N5 [label="Order Picking" color="#4FC3F7" fillcolor="#E1F5FE" shape=diamond style=filled]
+	N6 [label="Consolidation" color="#03A9F4" fillcolor="#B3E5FC" shape=rect style=filled]
+	N7 [label="Air Cargo Handling" color="#80DDEA" fillcolor="#D3F7F9" shape=preparation style=filled]
+	N8 [label="Yard Management" color="#80DDEA" fillcolor="#D3F7F9" shape=rect style=filled]
+	N9 [label="Hub Transfer" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N10 [label="Route Assignment" color="#80DDEA" fillcolor="#D3F7F9" shape=multipledocuments style=filled]
+	N11 [label="Warehouse Entry" color="#4FC3F7" fillcolor="#E1F5FE" shape=action style=filled]
+	N12 [label="Packing Process" color="#80DDEA" fillcolor="#D3F7F9" shape=vnode_shape style=filled]
+	N13 [label="Return Logistics" color="#80DDEA" fillcolor="#D3F7F9" shape=multipledocuments style=filled]
+	N14 [label="Global Trade Compliance" color="#80DDEA" fillcolor="#D3F7F9" shape=rectangle style=filled]
+	S0 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#03A9F4" fillcolor="#B3E5FC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Supply Chain Visibility {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Supply Chain Visibility"
+		nest0_0 [label="Cargo Tracking" color="#03A9F4" fillcolor="#B3E5FC" shape=diamond style=filled]
+		nest0_1 [label="Proof of Delivery" color="#4FC3F7" fillcolor="#E1F5FE" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Barcode Scanning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Barcode Scanning"
+		nest1_0 [label="Customs Declaration" color="#4FC3F7" fillcolor="#E1F5FE" shape=rect style=filled]
+		nest1_1 [label="Delivery Confirmation" color="#80DDEA" fillcolor="#D3F7F9" shape=multipledocuments style=filled]
+		nest1_2 [label="Ocean Freight Management" color="#03A9F4" fillcolor="#B3E5FC" shape=vnode_shape style=filled]
+		nest1_3 [label="Container Loading" color="#80DDEA" fillcolor="#D3F7F9" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#4FC3F7" penwidth=1.5 style=dashed label="verifies" dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N4 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N7 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=solid label="measures" dir=forward]
+	S0 -> N11 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S2 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N14 [color="#4FC3F7" penwidth=1.5 style=solid label="communicates" dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_27.txt b/test/diagrams/graph_hard/diagrams_27.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4d46e883e5465286dcb6ba8a2f87c76f8e9141dd
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_27.txt
@@ -0,0 +1,29 @@
+<Air Cargo Handling, connectedTo, Yard Management>
+<Cargo Tracking, connectedTo, Proof of Delivery>
+<Carrier Selection, connectedTo, Invoice Matching>
+<Carrier Selection, connectedTo, Warehouse Entry>
+<Carrier Selection, measures, Return Logistics>
+<Consolidation, connectedTo, Air Cargo Handling>
+<Consolidation, connectedTo, Cargo Tracking>
+<Container Loading, connectedTo, Air Cargo Handling>
+<Customs Declaration, connectedTo, Delivery Confirmation>
+<Delivery Confirmation, connectedTo, Ocean Freight Management>
+<Demand Forecasting Integration, connectedTo, Air Cargo Handling>
+<Demand Forecasting Integration, connectedTo, Order Picking>
+<Fleet Maintenance Scheduling, connectedTo, Sorting Center>
+<Hub Transfer, connectedTo, Route Assignment>
+<Invoice Matching, connectedTo, Demand Forecasting Integration>
+<Ocean Freight Management, connectedTo, Container Loading>
+<Order Picking, verifies, Consolidation>
+<Packing Process, connectedTo, Return Logistics>
+<Proof of Delivery, connectedTo, Demand Forecasting Integration>
+<Return Logistics, connectedTo, Global Trade Compliance>
+<Route Assignment, connectedTo, Warehouse Entry>
+<Sorting Center, connectedTo, Air Cargo Handling>
+<Sorting Center, connectedTo, Carrier Selection>
+<Warehouse Entry, connectedTo, Packing Process>
+<Yard Management, communicates, Global Trade Compliance>
+<Yard Management, connectedTo, Customs Declaration>
+<Yard Management, connectedTo, Hub Transfer>
+<Yard Management, connectedTo, Return Logistics>
+<Yard Management, connectedTo, Warehouse Entry>
diff --git a/test/diagrams/graph_hard/diagrams_270.dot b/test/diagrams/graph_hard/diagrams_270.dot
new file mode 100644
index 0000000000000000000000000000000000000000..80edbe2b37efd5dde13c07cff1debc5f217b2131
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_270.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=LR
+	N0 [label="Pedestrian Detection" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N1 [label="Public Acceptance and Trust" color="#9C27B0" fillcolor="#E1BEE7" shape=multipledocuments style=filled]
+	N2 [label="Over_the_Air Updates" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+	N3 [label="Automatic Emergency Braking" color="#7986CB" fillcolor="#E8EAF6" shape=preparation style=filled]
+	N4 [label="Remote Operation Capability" color="#9C27B0" fillcolor="#E1BEE7" shape=rectangle style=filled]
+	N5 [label="Accident Reconstruction for AVs" color="#9C27B0" fillcolor="#E1BEE7" shape=multipledocuments style=filled]
+	N6 [label="Object Detection and Classification" color="#E0E0E0" fillcolor="#EBEBEB" shape=vnode_shape style=filled]
+	N7 [label="Adaptive Cruise Control" color="#7986CB" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	N8 [label="Cloud Connectivity for AVs" color="#7986CB" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	N9 [label="Regulatory Compliance" color="#E0E0E0" fillcolor="#EBEBEB" shape=predefinedprocess style=filled]
+	N10 [label="Human_Machine Interface" color="#E0E0E0" fillcolor="#EBEBEB" shape=diamond style=filled]
+	S0 [label="" color="#7986CB" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#7986CB" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#E0E0E0" fillcolor="#EBEBEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#E0E0E0" fillcolor="#EBEBEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Edge Computing for AVs {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Edge Computing for AVs"
+		nest0_0 [label="Decision_Making Algorithms" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+		nest0_1 [label="Driver Monitoring Systems" color="#7986CB" fillcolor="#E8EAF6" shape=multipledocuments style=filled]
+		nest0_2 [label="Traffic Sign Recognition" color="#7986CB" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+		nest0_3 [label="Vehicle Diagnostics" color="#E0E0E0" fillcolor="#EBEBEB" shape=diamond style=filled]
+	}
+	subgraph cluster_Lane Keeping Assist {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Lane Keeping Assist"
+		nest1_0 [label="Ethical Decision_Making" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+		nest1_1 [label="Data Collection and Annotation" color="#7986CB" fillcolor="#E8EAF6" shape=action style=filled]
+		nest1_2 [label="Sensor Integration" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+		nest1_3 [label="Hardware Design" color="#7986CB" fillcolor="#E8EAF6" shape=database style=filled]
+	}
+	N0 -> N1 [color="#E0E0E0" penwidth=1.5 style=solid label="plans" dir=forward]
+	N1 -> N2 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid label="diagnoses" dir=forward]
+	nest0_1 -> nest0_2 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest0_0 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N8 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest1_0 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N3 -> S1 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#E0E0E0" penwidth=1.5 style=solid label="transports" dir=forward]
+	N7 -> S2 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#E0E0E0" penwidth=1.5 style=dashed label="maps" dir=forward]
+	S2 -> N10 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_271.dot b/test/diagrams/graph_hard/diagrams_271.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6f8866c380495a7604c96412954daf9f6459a514
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_271.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=TB
+	N0 [label="Carbon Emission Tracking" color="#73C6BC" fillcolor="#D0EFEE" shape=parallelogram style=filled]
+	N1 [label="Vehicle Location Tracking" color="#F06292" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+	N2 [label="Geofencing for Operations" color="#73C6BC" fillcolor="#D0EFEE" shape=rect style=filled]
+	N3 [label="Ticketing and Fare Collection" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N4 [label="Smart City Integration" color="#F06292" fillcolor="#FCE4EC" shape=preparation style=filled]
+	N5 [label="Passenger Safety Protocols" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N6 [label="Supply_Demand Balancing" color="#73C6BC" fillcolor="#D0EFEE" shape=inputoutput style=filled]
+	N7 [label="Charging or Refueling Logistics" color="#73C6BC" fillcolor="#D0EFEE" shape=preparation style=filled]
+	N8 [label="Policy Advocacy for Shared Mobility" color="#4285F4" fillcolor="#D0E0F8" shape=preparation style=filled]
+	N9 [label="Subscription Model Management" color="#4285F4" fillcolor="#D0E0F8" shape=multipledocuments style=filled]
+	N10 [label="User Onboarding" color="#4285F4" fillcolor="#D0E0F8" shape=parallelogram style=filled]
+	N11 [label="First_Mile or Last_Mile Solutions" color="#F06292" fillcolor="#FCE4EC" shape=preparation style=filled]
+	N12 [label="Car_sharing Services" color="#73C6BC" fillcolor="#D0EFEE" shape=preparation style=filled]
+	N13 [label="Customer Support" color="#73C6BC" fillcolor="#D0EFEE" shape=multipledocuments style=filled]
+	N14 [label="Micro_mobility Management" color="#F06292" fillcolor="#FCE4EC" shape=preparation style=filled]
+	N15 [label="Maintenance Scheduling" color="#4285F4" fillcolor="#D0E0F8" shape=vnode_shape style=filled]
+	N16 [label="Payment Processing" color="#F06292" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N17 [label="User Rating and Feedback Systems" color="#F06292" fillcolor="#FCE4EC" shape=action style=filled]
+	S0 [label="" color="#4285F4" fillcolor="#D0E0F8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4285F4" fillcolor="#D0E0F8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Data Analytics for Usage Patterns {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Data Analytics for Usage Patterns"
+		nest0_0 [label="Regulatory Compliance" color="#73C6BC" fillcolor="#D0EFEE" shape=database style=filled]
+		nest0_1 [label="Platform Development" color="#F06292" fillcolor="#FCE4EC" shape=document style=filled]
+	}
+	subgraph cluster_Route Optimization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Route Optimization"
+		nest1_0 [label="Demand Prediction" color="#F06292" fillcolor="#FCE4EC" shape=vnode_shape style=filled]
+		nest1_1 [label="Scooter_sharing Services" color="#73C6BC" fillcolor="#D0EFEE" shape=predefinedprocess style=filled]
+		nest1_2 [label="Dynamic Pricing" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	}
+	N0 -> N1 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N13 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed label="analyzes" dir=forward]
+	nest0_1 -> N4 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#73C6BC" penwidth=1.5 style=dashed label="integrates" dir=forward]
+	nest1_1 -> nest1_2 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N17 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N14 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N17 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	S1 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	M0 -> N7 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N12 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M2 -> N7 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_271.txt b/test/diagrams/graph_hard/diagrams_271.txt
new file mode 100644
index 0000000000000000000000000000000000000000..92d64364c81bb8485ddad0e0d59895e0dbb96ba0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_271.txt
@@ -0,0 +1,35 @@
+<Car_sharing Services, connectedTo, Customer Support>
+<Carbon Emission Tracking, connectedTo, Car_sharing Services>
+<Carbon Emission Tracking, connectedTo, Charging or Refueling Logistics>
+<Carbon Emission Tracking, connectedTo, Vehicle Location Tracking>
+<Charging or Refueling Logistics, connectedTo, Policy Advocacy for Shared Mobility>
+<Customer Support, analyzes, Regulatory Compliance>
+<Customer Support, connectedTo, Maintenance Scheduling>
+<Customer Support, connectedTo, Micro_mobility Management>
+<Customer Support, connectedTo, User Rating and Feedback Systems>
+<Demand Prediction, integrates, Scooter_sharing Services>
+<Dynamic Pricing, connectedTo, Ticketing and Fare Collection>
+<First_Mile or Last_Mile Solutions, connectedTo, Car_sharing Services>
+<Geofencing for Operations, connectedTo, Charging or Refueling Logistics>
+<Geofencing for Operations, connectedTo, Ticketing and Fare Collection>
+<Maintenance Scheduling, connectedTo, Payment Processing>
+<Micro_mobility Management, connectedTo, Maintenance Scheduling>
+<Micro_mobility Management, connectedTo, Payment Processing>
+<Micro_mobility Management, connectedTo, User Rating and Feedback Systems>
+<Passenger Safety Protocols, connectedTo, Charging or Refueling Logistics>
+<Passenger Safety Protocols, connectedTo, Supply_Demand Balancing>
+<Payment Processing, connectedTo, User Rating and Feedback Systems>
+<Platform Development, connectedTo, Smart City Integration>
+<Policy Advocacy for Shared Mobility, connectedTo, Subscription Model Management>
+<Regulatory Compliance, connectedTo, Platform Development>
+<Scooter_sharing Services, connectedTo, Dynamic Pricing>
+<Smart City Integration, connectedTo, Passenger Safety Protocols>
+<Subscription Model Management, connectedTo, User Onboarding>
+<Supply_Demand Balancing, connectedTo, Charging or Refueling Logistics>
+<Ticketing and Fare Collection, connectedTo, Charging or Refueling Logistics>
+<Ticketing and Fare Collection, connectedTo, Demand Prediction>
+<Ticketing and Fare Collection, connectedTo, Smart City Integration>
+<User Onboarding, connectedTo, First_Mile or Last_Mile Solutions>
+<Vehicle Location Tracking, connectedTo, Car_sharing Services>
+<Vehicle Location Tracking, connectedTo, Charging or Refueling Logistics>
+<Vehicle Location Tracking, connectedTo, Geofencing for Operations>
diff --git a/test/diagrams/graph_hard/diagrams_272.dot b/test/diagrams/graph_hard/diagrams_272.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6489fdcd4bc3cf7f4819ee7f60e0d0e5bee8e52f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_272.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=RL
+	N0 [label="Payment Processing" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N1 [label="Customer Support" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N2 [label="Geofencing for Operations" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N3 [label="Smart City Integration" color="#FFB74D" fillcolor="#FFF3E0" shape=database style=filled]
+	N4 [label="Public Transit Integration" color="#FFB74D" fillcolor="#FFF3E0" shape=action style=filled]
+	N5 [label="User Onboarding" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N6 [label="Ride_sharing Services" color="#80DDEA" fillcolor="#D3F7F9" shape=inputoutput style=filled]
+	N7 [label="Accessibility for Users" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N8 [label="Autonomous Shared Vehicles" color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N9 [label="Public_Private Partnerships" color="#80DDEA" fillcolor="#D3F7F9" shape=database style=filled]
+	N10 [label="Vehicle Booking" color="#80DDEA" fillcolor="#D3F7F9" shape=rect style=filled]
+	N11 [label="Demand Prediction" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N12 [label="Supply_Demand Balancing" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N13 [label="Route Optimization" color="#FFB74D" fillcolor="#FFF3E0" shape=action style=filled]
+	S0 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Carbon Emission Tracking {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Carbon Emission Tracking"
+		nest0_0 [label="Dynamic Pricing" color="#80DDEA" fillcolor="#D3F7F9" shape=document style=filled]
+		nest0_1 [label="Policy Advocacy for Shared Mobility" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	}
+	subgraph cluster_Vehicle Rebalancing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Vehicle Rebalancing"
+		nest1_0 [label="Scooter_sharing Services" color="#795548" fillcolor="#D7CCC8" shape=diamond style=filled]
+		nest1_1 [label="Ticketing and Fare Collection" color="#795548" fillcolor="#D7CCC8" shape=document style=filled]
+	}
+	N0 -> N1 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#80DDEA" penwidth=1.5 style=dashed label="licenses" dir=forward]
+	N2 -> N3 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N12 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N9 -> S1 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	M0 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> M1 [color="#795548" penwidth=1.5 style=dashed label="rates" dir=forward]
+	N9 -> M1 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	M1 -> N13 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#80DDEA" penwidth=1.5 style=dashed label="unlocks" dir=forward]
+	M2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_272.txt b/test/diagrams/graph_hard/diagrams_272.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9b99b9757fb05fce563d8c58fa106949170b86b8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_272.txt
@@ -0,0 +1,31 @@
+<Accessibility for Users, connectedTo, Autonomous Shared Vehicles>
+<Autonomous Shared Vehicles, connectedTo, Public_Private Partnerships>
+<Autonomous Shared Vehicles, rates, Route Optimization>
+<Customer Support, connectedTo, Scooter_sharing Services>
+<Customer Support, connectedTo, Smart City Integration>
+<Customer Support, connectedTo, Supply_Demand Balancing>
+<Customer Support, licenses, Geofencing for Operations>
+<Demand Prediction, connectedTo, Supply_Demand Balancing>
+<Dynamic Pricing, connectedTo, Policy Advocacy for Shared Mobility>
+<Geofencing for Operations, connectedTo, Smart City Integration>
+<Payment Processing, connectedTo, Customer Support>
+<Payment Processing, unlocks, Smart City Integration>
+<Policy Advocacy for Shared Mobility, connectedTo, Ride_sharing Services>
+<Public Transit Integration, connectedTo, Accessibility for Users>
+<Public Transit Integration, connectedTo, Ride_sharing Services>
+<Public Transit Integration, connectedTo, Supply_Demand Balancing>
+<Public Transit Integration, connectedTo, User Onboarding>
+<Public_Private Partnerships, connectedTo, Demand Prediction>
+<Public_Private Partnerships, connectedTo, Route Optimization>
+<Public_Private Partnerships, connectedTo, Supply_Demand Balancing>
+<Public_Private Partnerships, connectedTo, Vehicle Booking>
+<Ride_sharing Services, connectedTo, Accessibility for Users>
+<Ride_sharing Services, connectedTo, Dynamic Pricing>
+<Ride_sharing Services, connectedTo, Route Optimization>
+<Ride_sharing Services, connectedTo, Supply_Demand Balancing>
+<Scooter_sharing Services, connectedTo, Ticketing and Fare Collection>
+<Smart City Integration, connectedTo, Public Transit Integration>
+<Supply_Demand Balancing, connectedTo, Route Optimization>
+<Ticketing and Fare Collection, connectedTo, Supply_Demand Balancing>
+<User Onboarding, connectedTo, Ride_sharing Services>
+<Vehicle Booking, connectedTo, Demand Prediction>
diff --git a/test/diagrams/graph_hard/diagrams_273.dot b/test/diagrams/graph_hard/diagrams_273.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ac6d3cf2ffc921d85b2c5cb933a98e09cacb7c25
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_273.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Ticketing and Fare Collection" color="#FF9800" fillcolor="#FFE0B2" shape=multipledocuments style=filled]
+	N1 [label="Parking Integration" color="#A188D0" fillcolor="#DACBE3" shape=database style=filled]
+	N2 [label="Customer Support" color="#A188D0" fillcolor="#DACBE3" shape=multipledocuments style=filled]
+	N3 [label="Geofencing for Operations" color="#FBC02D" fillcolor="#FFFDE7" shape=action style=filled]
+	N4 [label="Payment Processing" color="#FBC02D" fillcolor="#FFFDE7" shape=predefinedprocess style=filled]
+	N5 [label="Dynamic Pricing" color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+	N6 [label="Driver Management" color="#FBC02D" fillcolor="#FFFDE7" shape=database style=filled]
+	N7 [label="Charging or Refueling Logistics" color="#FBC02D" fillcolor="#FFFDE7" shape=predefinedprocess style=filled]
+	N8 [label="Micro_mobility Management" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N9 [label="Bike_sharing Services" color="#FBC02D" fillcolor="#FFFDE7" shape=inputoutput style=filled]
+	N10 [label="User Registration" color="#FF9800" fillcolor="#FFE0B2" shape=preparation style=filled]
+	N11 [label="Route Optimization" color="#FBC02D" fillcolor="#FFFDE7" shape=vnode_shape style=filled]
+	N12 [label="Car_sharing Services" color="#A188D0" fillcolor="#DACBE3" shape=parallelogram style=filled]
+	N13 [label="Passenger Safety Protocols" color="#A188D0" fillcolor="#DACBE3" shape=rectangle style=filled]
+	S0 [label="" color="#FF9800" fillcolor="#FFE0B2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FBC02D" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Public_Private Partnerships {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Public_Private Partnerships"
+		nest0_0 [label="User Onboarding" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest0_1 [label="Smart City Integration" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	}
+	subgraph cluster_Fraud Prevention {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Fraud Prevention"
+		nest1_0 [label="Sustainability Initiatives" color="#FF9800" fillcolor="#FFE0B2" shape=predefinedprocess style=filled]
+		nest1_1 [label="Vehicle Booking" color="#FF9800" fillcolor="#FFE0B2" shape=inputoutput style=filled]
+		nest1_2 [label="Regulatory Compliance" color="#FF9800" fillcolor="#FFE0B2" shape=document style=filled]
+		nest1_3 [label="Data Analytics for Usage Patterns" color="#FF9800" fillcolor="#FFE0B2" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N6 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N8 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N0 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N9 -> S1 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> S2 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N3 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N8 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N11 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N7 -> M1 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N9 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N5 -> M2 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#A188D0" penwidth=1.5 style=dashed label="verifies" dir=forward]
+	M2 -> N7 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_274.dot b/test/diagrams/graph_hard/diagrams_274.dot
new file mode 100644
index 0000000000000000000000000000000000000000..17d85b785b0443fad98630e6f02ec3a5a4bc189d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_274.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=RL
+	N0 [label="Automated Payment" color="#9575CD" fillcolor="#EDE7F6" shape=predefinedprocess style=filled]
+	N1 [label="Data Analytics for Parking Usage" color="#9575CD" fillcolor="#EDE7F6" shape=document style=filled]
+	N2 [label="Space Detection" color="#4FC3F7" fillcolor="#E1F5FE" shape=vnode_shape style=filled]
+	N3 [label="Environmental Impact Monitoring" color="#7E57C2" fillcolor="#EDE7F6" shape=inputoutput style=filled]
+	N4 [label="Mobile Parking Apps" color="#7E57C2" fillcolor="#EDE7F6" shape=action style=filled]
+	N5 [label="Fleet Parking Solutions" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N6 [label="Dynamic Pricing" color="#4FC3F7" fillcolor="#E1F5FE" shape=hexagon style=filled]
+	N7 [label="Off_Street Parking Management" color="#9575CD" fillcolor="#EDE7F6" shape=rectangle style=filled]
+	N8 [label="Customer Support" color="#7E57C2" fillcolor="#EDE7F6" shape=rect style=filled]
+	N9 [label="Reservations System" color="#9575CD" fillcolor="#EDE7F6" shape=document style=filled]
+	N10 [label="Violation Detection" color="#4FC3F7" fillcolor="#E1F5FE" shape=multipledocuments style=filled]
+	N11 [label="Emergency Vehicle Access Management" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N12 [label="Integration with Navigation Apps" color="#9575CD" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	N13 [label="Revenue Management" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	S0 [label="" color="#7E57C2" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#4FC3F7" fillcolor="#E1F5FE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_User Experience Design for Apps {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="User Experience Design for Apps"
+		nest0_0 [label="Smart Parking Meters" color="#4FC3F7" fillcolor="#E1F5FE" shape=database style=filled]
+		nest0_1 [label="Edge Computing for Parking Data" color="#9575CD" fillcolor="#EDE7F6" shape=inputoutput style=filled]
+		nest0_2 [label="Enforcement and Fines Management" color="#4FC3F7" fillcolor="#E1F5FE" shape=diamond style=filled]
+	}
+	subgraph cluster_Electric Vehicle Charging Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Electric Vehicle Charging Integration"
+		nest1_0 [label="Intelligent Traffic Management Interaction" color="#9575CD" fillcolor="#EDE7F6" shape=document style=filled]
+		nest1_1 [label="Permit Management" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#9575CD" penwidth=1.5 style=solid label="optimizes" dir=forward]
+	N6 -> N7 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N12 [color="#4FC3F7" penwidth=1.5 style=solid label="warns" dir=forward]
+	N1 -> S0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=dashed label="integrates" dir=forward]
+	S0 -> N3 [color="#7E57C2" penwidth=1.5 style=solid label="manages" dir=forward]
+	S0 -> N5 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#7E57C2" penwidth=1.5 style=dashed label="predicts" dir=forward]
+	S2 -> N11 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N0 -> N7 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N5 -> N0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_274.txt b/test/diagrams/graph_hard/diagrams_274.txt
new file mode 100644
index 0000000000000000000000000000000000000000..88841824d6e95aad8caeda5c9151412e95b2c5b4
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_274.txt
@@ -0,0 +1,28 @@
+<Automated Payment, connectedTo, Data Analytics for Parking Usage>
+<Automated Payment, connectedTo, Off_Street Parking Management>
+<Customer Support, connectedTo, Emergency Vehicle Access Management>
+<Customer Support, connectedTo, Reservations System>
+<Customer Support, predicts, Violation Detection>
+<Data Analytics for Parking Usage, connectedTo, Fleet Parking Solutions>
+<Data Analytics for Parking Usage, connectedTo, Intelligent Traffic Management Interaction>
+<Data Analytics for Parking Usage, connectedTo, Space Detection>
+<Data Analytics for Parking Usage, connectedTo, Violation Detection>
+<Data Analytics for Parking Usage, integrates, Emergency Vehicle Access Management>
+<Data Analytics for Parking Usage, manages, Environmental Impact Monitoring>
+<Dynamic Pricing, connectedTo, Off_Street Parking Management>
+<Edge Computing for Parking Data, connectedTo, Enforcement and Fines Management>
+<Emergency Vehicle Access Management, connectedTo, Integration with Navigation Apps>
+<Enforcement and Fines Management, connectedTo, Revenue Management>
+<Environmental Impact Monitoring, connectedTo, Mobile Parking Apps>
+<Fleet Parking Solutions, connectedTo, Automated Payment>
+<Fleet Parking Solutions, optimizes, Dynamic Pricing>
+<Integration with Navigation Apps, connectedTo, Revenue Management>
+<Intelligent Traffic Management Interaction, connectedTo, Permit Management>
+<Mobile Parking Apps, connectedTo, Fleet Parking Solutions>
+<Off_Street Parking Management, connectedTo, Customer Support>
+<Off_Street Parking Management, connectedTo, Smart Parking Meters>
+<Permit Management, warns, Integration with Navigation Apps>
+<Reservations System, connectedTo, Violation Detection>
+<Smart Parking Meters, connectedTo, Edge Computing for Parking Data>
+<Space Detection, connectedTo, Environmental Impact Monitoring>
+<Violation Detection, connectedTo, Emergency Vehicle Access Management>
diff --git a/test/diagrams/graph_hard/diagrams_276.dot b/test/diagrams/graph_hard/diagrams_276.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9e65013483f10e1f03100c94421c99fe8dfe7489
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_276.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=LR
+	N0 [label="User Experience Design for Apps" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N1 [label="Smart City Integration for Parking" color="#E91E63" fillcolor="#F8BBD0" shape=parallelogram style=filled]
+	N2 [label="Dynamic Pricing" color="#4285F4" fillcolor="#D0E0F8" shape=parallelogram style=filled]
+	N3 [label="Fleet Parking Solutions" color="#4285F4" fillcolor="#D0E0F8" shape=multipledocuments style=filled]
+	N4 [label="Data Analytics for Parking Usage" color="#E91E63" fillcolor="#F8BBD0" shape=diamond style=filled]
+	N5 [label="Electric Vehicle Charging Integration" color="#E91E63" fillcolor="#F8BBD0" shape=inputoutput style=filled]
+	N6 [label="Permit Management" color="#5C6BC0" fillcolor="#E8EAF6" shape=database style=filled]
+	N7 [label="Edge Computing for Parking Data" color="#5C6BC0" fillcolor="#E8EAF6" shape=action style=filled]
+	N8 [label="Vacancy Monitoring" color="#4285F4" fillcolor="#D0E0F8" shape=preparation style=filled]
+	N9 [label="Off_Street Parking Management" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+	N10 [label="Billing and Reconciliation" color="#5C6BC0" fillcolor="#E8EAF6" shape=vnode_shape style=filled]
+	N11 [label="Automated Parking Garages" color="#5C6BC0" fillcolor="#E8EAF6" shape=rect style=filled]
+	N12 [label="Revenue Management" color="#5C6BC0" fillcolor="#E8EAF6" shape=rect style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#F8BBD0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#E91E63" fillcolor="#F8BBD0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#4285F4" fillcolor="#D0E0F8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#E91E63" fillcolor="#F8BBD0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Maintenance of Systems {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Maintenance of Systems"
+		nest0_0 [label="Space Detection" color="#5C6BC0" fillcolor="#E8EAF6" shape=multipledocuments style=filled]
+		nest0_1 [label="Navigation to Open Space" color="#4285F4" fillcolor="#D0E0F8" shape=preparation style=filled]
+		nest0_2 [label="Smart Parking Meters" color="#5C6BC0" fillcolor="#E8EAF6" shape=predefinedprocess style=filled]
+		nest0_3 [label="IoT Sensors for Parking" color="#4285F4" fillcolor="#D0E0F8" shape=preparation style=filled]
+	}
+	subgraph cluster_Automated Payment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Automated Payment"
+		nest1_0 [label="Customer Support" color="#4285F4" fillcolor="#D0E0F8" shape=database style=filled]
+		nest1_1 [label="Cloud_based Parking Platforms" color="#5C6BC0" fillcolor="#E8EAF6" shape=action style=filled]
+		nest1_2 [label="Violation Detection" color="#4285F4" fillcolor="#D0E0F8" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#E91E63" penwidth=1.5 style=dashed label="communicates" dir=forward]
+	N8 -> N9 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed label="guides" dir=forward]
+	nest0_1 -> nest0_2 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest0_0 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N10 [color="#4285F4" penwidth=1.5 style=dashed label="pays" dir=forward]
+	nest1_0 -> nest1_1 [color="#E91E63" penwidth=1.5 style=solid label="forecasts" dir=forward]
+	nest1_1 -> nest1_2 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#5C6BC0" penwidth=1.5 style=solid label="integrates" dir=forward]
+	nest1_2 -> N4 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N9 -> S0 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N8 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=dashed label="directs" dir=forward]
+	N4 -> M0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N9 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N12 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M2 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_276.txt b/test/diagrams/graph_hard/diagrams_276.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a546e75a0f28bd0b3ce23c9533358d347161c07f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_276.txt
@@ -0,0 +1,33 @@
+<Automated Parking Garages, connectedTo, Revenue Management>
+<Billing and Reconciliation, connectedTo, Automated Parking Garages>
+<Cloud_based Parking Platforms, connectedTo, Violation Detection>
+<Customer Support, forecasts, Cloud_based Parking Platforms>
+<Data Analytics for Parking Usage, connectedTo, Electric Vehicle Charging Integration>
+<Data Analytics for Parking Usage, connectedTo, Off_Street Parking Management>
+<Data Analytics for Parking Usage, connectedTo, Revenue Management>
+<Data Analytics for Parking Usage, integrates, Customer Support>
+<Dynamic Pricing, connectedTo, Fleet Parking Solutions>
+<Dynamic Pricing, connectedTo, Off_Street Parking Management>
+<Edge Computing for Parking Data, communicates, Vacancy Monitoring>
+<Edge Computing for Parking Data, connectedTo, Revenue Management>
+<Electric Vehicle Charging Integration, connectedTo, Permit Management>
+<Fleet Parking Solutions, connectedTo, Data Analytics for Parking Usage>
+<IoT Sensors for Parking, pays, Billing and Reconciliation>
+<Navigation to Open Space, connectedTo, Smart Parking Meters>
+<Off_Street Parking Management, connectedTo, Automated Parking Garages>
+<Off_Street Parking Management, connectedTo, Billing and Reconciliation>
+<Off_Street Parking Management, connectedTo, Revenue Management>
+<Permit Management, connectedTo, Edge Computing for Parking Data>
+<Smart City Integration for Parking, connectedTo, Dynamic Pricing>
+<Smart City Integration for Parking, connectedTo, Off_Street Parking Management>
+<Smart City Integration for Parking, connectedTo, Revenue Management>
+<Smart Parking Meters, connectedTo, IoT Sensors for Parking>
+<Space Detection, guides, Navigation to Open Space>
+<User Experience Design for Apps, connectedTo, Revenue Management>
+<User Experience Design for Apps, connectedTo, Smart City Integration for Parking>
+<Vacancy Monitoring, connectedTo, Billing and Reconciliation>
+<Vacancy Monitoring, connectedTo, Off_Street Parking Management>
+<Vacancy Monitoring, connectedTo, Revenue Management>
+<Vacancy Monitoring, connectedTo, Space Detection>
+<Vacancy Monitoring, directs, Automated Parking Garages>
+<Violation Detection, connectedTo, Data Analytics for Parking Usage>
diff --git a/test/diagrams/graph_hard/diagrams_277.dot b/test/diagrams/graph_hard/diagrams_277.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c2a301946babcfb140d226742d69f78807b2665e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_277.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=BT
+	N0 [label="Sports Event Ticketing" color="#9C27B0" fillcolor="#E1BEE7" shape=database style=filled]
+	N1 [label="Customer Relationship Management Integration" color="#9575CD" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N2 [label="Event Creation" color="#3F51B5" fillcolor="#C5CAE9" shape=document style=filled]
+	N3 [label="Pricing Configuration" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+	N4 [label="Waiting List Management" color="#3F51B5" fillcolor="#C5CAE9" shape=parallelogram style=filled]
+	N5 [label="Access Control" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N6 [label="Ticket Sales" color="#9C27B0" fillcolor="#E1BEE7" shape=inputoutput style=filled]
+	N7 [label="Blockchain Ticketing for Authenticity" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+	N8 [label="Subscription or Season Pass Management" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N9 [label="Agent Network Management" color="#9C27B0" fillcolor="#E1BEE7" shape=vnode_shape style=filled]
+	N10 [label="Order Confirmation" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N11 [label="Ticket Delivery" color="#9C27B0" fillcolor="#E1BEE7" shape=document style=filled]
+	S0 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Fraud Prevention {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Fraud Prevention"
+		nest0_0 [label="Box Office Management" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+		nest0_1 [label="Resale Market Integration" color="#9575CD" fillcolor="#EDE7F6" shape=rect style=filled]
+		nest0_2 [label="Promotional Code Management" color="#9575CD" fillcolor="#EDE7F6" shape=preparation style=filled]
+	}
+	subgraph cluster_Audience Segmentation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Audience Segmentation"
+		nest1_0 [label="Venue Capacity Management" color="#3F51B5" fillcolor="#C5CAE9" shape=rectangle style=filled]
+		nest1_1 [label="Public Transport Ticketing" color="#9575CD" fillcolor="#EDE7F6" shape=action style=filled]
+		nest1_2 [label="Biometric Ticketing" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+		nest1_3 [label="Airline Ticketing" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	}
+	N0 -> N1 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#9C27B0" penwidth=1.5 style=solid label="validates" dir=forward]
+	N8 -> N9 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N5 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest1_0 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N2 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> S2 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M0 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	M0 -> N10 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid label="payments" dir=forward]
+	M1 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_277.txt b/test/diagrams/graph_hard/diagrams_277.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bccd6783354ab416503942f5da3ca76754550f71
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_277.txt
@@ -0,0 +1,31 @@
+<Access Control, connectedTo, Agent Network Management>
+<Access Control, connectedTo, Blockchain Ticketing for Authenticity>
+<Access Control, connectedTo, Ticket Sales>
+<Agent Network Management, connectedTo, Order Confirmation>
+<Airline Ticketing, connectedTo, Event Creation>
+<Biometric Ticketing, connectedTo, Airline Ticketing>
+<Blockchain Ticketing for Authenticity, validates, Subscription or Season Pass Management>
+<Box Office Management, connectedTo, Resale Market Integration>
+<Customer Relationship Management Integration, connectedTo, Event Creation>
+<Customer Relationship Management Integration, connectedTo, Waiting List Management>
+<Event Creation, connectedTo, Access Control>
+<Event Creation, connectedTo, Pricing Configuration>
+<Event Creation, connectedTo, Ticket Delivery>
+<Event Creation, connectedTo, Waiting List Management>
+<Order Confirmation, connectedTo, Ticket Delivery>
+<Pricing Configuration, connectedTo, Agent Network Management>
+<Pricing Configuration, connectedTo, Order Confirmation>
+<Pricing Configuration, connectedTo, Waiting List Management>
+<Promotional Code Management, connectedTo, Access Control>
+<Public Transport Ticketing, connectedTo, Biometric Ticketing>
+<Resale Market Integration, connectedTo, Promotional Code Management>
+<Sports Event Ticketing, connectedTo, Customer Relationship Management Integration>
+<Sports Event Ticketing, payments, Waiting List Management>
+<Subscription or Season Pass Management, connectedTo, Agent Network Management>
+<Subscription or Season Pass Management, connectedTo, Order Confirmation>
+<Ticket Sales, connectedTo, Blockchain Ticketing for Authenticity>
+<Ticket Sales, connectedTo, Box Office Management>
+<Ticket Sales, connectedTo, Order Confirmation>
+<Ticket Sales, connectedTo, Venue Capacity Management>
+<Venue Capacity Management, connectedTo, Public Transport Ticketing>
+<Waiting List Management, connectedTo, Access Control>
diff --git a/test/diagrams/graph_hard/diagrams_278.dot b/test/diagrams/graph_hard/diagrams_278.dot
new file mode 100644
index 0000000000000000000000000000000000000000..bb8f26f7647ab1decf806179c10d6ba32a8295dc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_278.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=TB
+	N0 [label="Event Promotion Tools" color="#61CAC3" fillcolor="#C2E8E6" shape=action style=filled]
+	N1 [label="Festival Ticketing" color="#FFF176" fillcolor="#FFFDE7" shape=rectangle style=filled]
+	N2 [label="Box Office Management" color="#42A5F5" fillcolor="#F1F8FF" shape=rect style=filled]
+	N3 [label="Theater Ticketing" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N4 [label="Mobile Ticketing" color="#42A5F5" fillcolor="#F1F8FF" shape=inputoutput style=filled]
+	N5 [label="Ticket Sales" color="#FFF176" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N6 [label="Theme Park Ticketing" color="#FFF176" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N7 [label="Order Confirmation" color="#FFF176" fillcolor="#FFFDE7" shape=rectangle style=filled]
+	N8 [label="Access Control" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N9 [label="Dynamic Pricing" color="#61CAC3" fillcolor="#C2E8E6" shape=rectangle style=filled]
+	N10 [label="Post_Event Feedback Collection" color="#61CAC3" fillcolor="#C2E8E6" shape=predefinedprocess style=filled]
+	N11 [label="Public Transport Ticketing" color="#FFF176" fillcolor="#FFFDE7" shape=rectangle style=filled]
+	N12 [label="Scalper Prevention" color="#42A5F5" fillcolor="#F1F8FF" shape=database style=filled]
+	N13 [label="Fraud Prevention" color="#42A5F5" fillcolor="#F1F8FF" shape=action style=filled]
+	N14 [label="Audience Segmentation" color="#42A5F5" fillcolor="#F1F8FF" shape=preparation style=filled]
+	N15 [label="Waiting List Management" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N16 [label="Refund Management" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	S0 [label="" color="#42A5F5" fillcolor="#F1F8FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFF176" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFF176" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#42A5F5" fillcolor="#F1F8FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Analytics on Sales Data {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Analytics on Sales Data"
+		nest0_0 [label="Concert Ticketing" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest0_1 [label="Blockchain Ticketing for Authenticity" color="#FFF176" fillcolor="#FFFDE7" shape=action style=filled]
+	}
+	subgraph cluster_Pricing Configuration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Pricing Configuration"
+		nest1_0 [label="Event Creation" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+		nest1_1 [label="Airline Ticketing" color="#42A5F5" fillcolor="#F1F8FF" shape=document style=filled]
+		nest1_2 [label="Group Booking Management" color="#61CAC3" fillcolor="#C2E8E6" shape=parallelogram style=filled]
+		nest1_3 [label="Customer Relationship Management Integration" color="#42A5F5" fillcolor="#F1F8FF" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#61CAC3" penwidth=1.5 style=solid label="reserves" dir=forward]
+	N6 -> N7 [color="#FFF176" penwidth=1.5 style=dashed label="integrates" dir=forward]
+	N7 -> N8 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#42A5F5" penwidth=1.5 style=dashed label="discounts" dir=forward]
+	N11 -> N12 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#FFF176" penwidth=1.5 style=dashed label="reports" dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N8 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed label="scans" dir=forward]
+	N4 -> nest1_0 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N10 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N11 -> S0 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S1 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N12 -> M0 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N15 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#61CAC3" penwidth=1.5 style=dashed label="sells" dir=forward]
+	M1 -> N6 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_278.txt b/test/diagrams/graph_hard/diagrams_278.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1ec10f3ae5182eb0f1b0edc8b74e006e51d2916b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_278.txt
@@ -0,0 +1,35 @@
+<Access Control, connectedTo, Dynamic Pricing>
+<Access Control, connectedTo, Public Transport Ticketing>
+<Access Control, connectedTo, Refund Management>
+<Access Control, connectedTo, Scalper Prevention>
+<Airline Ticketing, connectedTo, Group Booking Management>
+<Audience Segmentation, connectedTo, Waiting List Management>
+<Blockchain Ticketing for Authenticity, connectedTo, Access Control>
+<Box Office Management, connectedTo, Theater Ticketing>
+<Concert Ticketing, connectedTo, Blockchain Ticketing for Authenticity>
+<Customer Relationship Management Integration, connectedTo, Post_Event Feedback Collection>
+<Dynamic Pricing, connectedTo, Post_Event Feedback Collection>
+<Event Creation, connectedTo, Airline Ticketing>
+<Event Promotion Tools, connectedTo, Festival Ticketing>
+<Festival Ticketing, connectedTo, Box Office Management>
+<Festival Ticketing, connectedTo, Waiting List Management>
+<Festival Ticketing, sells, Theme Park Ticketing>
+<Fraud Prevention, connectedTo, Audience Segmentation>
+<Group Booking Management, scans, Customer Relationship Management Integration>
+<Mobile Ticketing, connectedTo, Event Creation>
+<Mobile Ticketing, connectedTo, Ticket Sales>
+<Mobile Ticketing, connectedTo, Waiting List Management>
+<Order Confirmation, connectedTo, Access Control>
+<Post_Event Feedback Collection, discounts, Public Transport Ticketing>
+<Public Transport Ticketing, connectedTo, Fraud Prevention>
+<Public Transport Ticketing, connectedTo, Scalper Prevention>
+<Public Transport Ticketing, connectedTo, Waiting List Management>
+<Scalper Prevention, connectedTo, Fraud Prevention>
+<Scalper Prevention, connectedTo, Waiting List Management>
+<Theater Ticketing, connectedTo, Concert Ticketing>
+<Theater Ticketing, connectedTo, Mobile Ticketing>
+<Theater Ticketing, connectedTo, Theme Park Ticketing>
+<Theme Park Ticketing, integrates, Order Confirmation>
+<Ticket Sales, connectedTo, Waiting List Management>
+<Ticket Sales, reserves, Theme Park Ticketing>
+<Waiting List Management, reports, Refund Management>
diff --git a/test/diagrams/graph_hard/diagrams_279.dot b/test/diagrams/graph_hard/diagrams_279.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7ae5791770711a927e8029ba74d25c75382cde88
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_279.dot
@@ -0,0 +1,88 @@
+digraph {
+	rankdir=RL
+	N0 [label="Mobile Ticketing" color="#FFD54F" fillcolor="#FFF8E1" shape=predefinedprocess style=filled]
+	N1 [label="Refund Management" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N2 [label="Biometric Ticketing" color="#FF5722" fillcolor="#FFCCBC" shape=vnode_shape style=filled]
+	N3 [label="Audience Segmentation" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+	N4 [label="Personalized Ticket Offers" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N5 [label="Access Control" color="#FFD54F" fillcolor="#FFF8E1" shape=vnode_shape style=filled]
+	N6 [label="Queue Management" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+	N7 [label="Post_Event Feedback Collection" color="#FF5722" fillcolor="#FFCCBC" shape=predefinedprocess style=filled]
+	N8 [label="Theme Park Ticketing" color="#FF5722" fillcolor="#FFCCBC" shape=multipledocuments style=filled]
+	N9 [label="Seat Mapping" color="#607D8B" fillcolor="#CFD8DC" shape=action style=filled]
+	N10 [label="Concert Ticketing" color="#607D8B" fillcolor="#CFD8DC" shape=document style=filled]
+	N11 [label="Ticket Sales" color="#FF5722" fillcolor="#FFCCBC" shape=database style=filled]
+	N12 [label="Agent Network Management" color="#FF5722" fillcolor="#FFCCBC" shape=vnode_shape style=filled]
+	N13 [label="Festival Ticketing" color="#607D8B" fillcolor="#CFD8DC" shape=preparation style=filled]
+	N14 [label="Museum Ticketing" color="#FFD54F" fillcolor="#FFF8E1" shape=diamond style=filled]
+	N15 [label="Customer Relationship Management Integration" color="#607D8B" fillcolor="#CFD8DC" shape=predefinedprocess style=filled]
+	N16 [label="Event Creation" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N17 [label="Sports Event Ticketing" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N18 [label="Box Office Management" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N19 [label="Group Booking Management" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	S0 [label="" color="#FF5722" fillcolor="#FFCCBC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FF5722" fillcolor="#FFCCBC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#607D8B" fillcolor="#CFD8DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Analytics on Sales Data {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Analytics on Sales Data"
+		nest0_0 [label="Ticket Delivery" color="#FFD54F" fillcolor="#FFF8E1" shape=predefinedprocess style=filled]
+		nest0_1 [label="Theater Ticketing" color="#607D8B" fillcolor="#CFD8DC" shape=predefinedprocess style=filled]
+		nest0_2 [label="Event Promotion Tools" color="#FFD54F" fillcolor="#FFF8E1" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Resale Market Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Resale Market Integration"
+		nest1_0 [label="Payment Processing" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+		nest1_1 [label="Fan Loyalty Programs" color="#FFD54F" fillcolor="#FFF8E1" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#FF5722" penwidth=1.5 style=solid label="connects" dir=forward]
+	N15 -> N16 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N17 -> N18 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N18 -> N19 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest0_0 [color="#FFD54F" penwidth=1.5 style=dashed label="manages" dir=forward]
+	nest0_2 -> N16 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest1_0 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N9 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N18 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N0 -> S1 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N16 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	S1 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	M0 -> N10 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N6 -> M2 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N8 -> M2 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M2 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	M2 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_279.txt b/test/diagrams/graph_hard/diagrams_279.txt
new file mode 100644
index 0000000000000000000000000000000000000000..aa2485bbd8ee3a2d335210d50f121ee48947f018
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_279.txt
@@ -0,0 +1,40 @@
+<Access Control, connectedTo, Concert Ticketing>
+<Access Control, connectedTo, Queue Management>
+<Agent Network Management, connectedTo, Festival Ticketing>
+<Audience Segmentation, connectedTo, Personalized Ticket Offers>
+<Audience Segmentation, connectedTo, Post_Event Feedback Collection>
+<Biometric Ticketing, connectedTo, Audience Segmentation>
+<Biometric Ticketing, connectedTo, Concert Ticketing>
+<Box Office Management, connectedTo, Group Booking Management>
+<Concert Ticketing, connectedTo, Ticket Sales>
+<Customer Relationship Management Integration, connectedTo, Event Creation>
+<Event Creation, connectedTo, Sports Event Ticketing>
+<Event Promotion Tools, connectedTo, Event Creation>
+<Fan Loyalty Programs, connectedTo, Seat Mapping>
+<Festival Ticketing, connectedTo, Museum Ticketing>
+<Festival Ticketing, connectedTo, Payment Processing>
+<Festival Ticketing, manages, Ticket Delivery>
+<Mobile Ticketing, connectedTo, Audience Segmentation>
+<Mobile Ticketing, connectedTo, Concert Ticketing>
+<Mobile Ticketing, connectedTo, Event Creation>
+<Mobile Ticketing, connectedTo, Refund Management>
+<Mobile Ticketing, connectedTo, Ticket Sales>
+<Museum Ticketing, connects, Customer Relationship Management Integration>
+<Payment Processing, connectedTo, Fan Loyalty Programs>
+<Personalized Ticket Offers, connectedTo, Access Control>
+<Personalized Ticket Offers, connectedTo, Post_Event Feedback Collection>
+<Post_Event Feedback Collection, connectedTo, Museum Ticketing>
+<Post_Event Feedback Collection, connectedTo, Theme Park Ticketing>
+<Queue Management, connectedTo, Museum Ticketing>
+<Queue Management, connectedTo, Post_Event Feedback Collection>
+<Refund Management, connectedTo, Agent Network Management>
+<Refund Management, connectedTo, Biometric Ticketing>
+<Refund Management, connectedTo, Box Office Management>
+<Refund Management, connectedTo, Festival Ticketing>
+<Seat Mapping, connectedTo, Concert Ticketing>
+<Sports Event Ticketing, connectedTo, Box Office Management>
+<Theater Ticketing, connectedTo, Event Promotion Tools>
+<Theme Park Ticketing, connectedTo, Museum Ticketing>
+<Theme Park Ticketing, connectedTo, Seat Mapping>
+<Ticket Delivery, connectedTo, Theater Ticketing>
+<Ticket Sales, connectedTo, Agent Network Management>
diff --git a/test/diagrams/graph_hard/diagrams_280.txt b/test/diagrams/graph_hard/diagrams_280.txt
new file mode 100644
index 0000000000000000000000000000000000000000..643f6d647049b1c75e346f4318fa1ea78c8b4183
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_280.txt
@@ -0,0 +1,32 @@
+<Accessibility Features, connectedTo, Hardware Tamper Detection>
+<Auditability, connectedTo, Hardware Tamper Detection>
+<Auditability, connectedTo, Legal Framework Compliance>
+<Auditability, connectedTo, Post_Election Audits>
+<Auditability, connectedTo, Remote Voting Solutions>
+<Blockchain for Voting, connectedTo, Threat Modeling>
+<Cryptographic Security, connectedTo, Optical Scan Systems>
+<Cybersecurity for Voting Systems, connectedTo, Election Official Training>
+<Direct Recording Electronic Systems, connectedTo, Auditability>
+<Election Official Training, connectedTo, Direct Recording Electronic Systems>
+<Election Official Training, connectedTo, Results Aggregation>
+<Election Official Training, connectedTo, Voter Authentication>
+<Hardware Tamper Detection, connectedTo, Legal Framework Compliance>
+<Hardware Tamper Detection, connectedTo, Zero_Knowledge Proofs for Privacy>
+<Legal Framework Compliance, connectedTo, System Certification>
+<Optical Scan Systems, connectedTo, Results Aggregation>
+<Optical Scan Systems, connectedTo, Transparency>
+<Post_Election Audits, connectedTo, Voting Machine Design>
+<Remote Voting Solutions, connectedTo, Accessibility Features>
+<System Certification, connectedTo, Voter Privacy Protection>
+<Threat Modeling, connectedTo, Optical Scan Systems>
+<Transparency, connectedTo, Cybersecurity for Voting Systems>
+<Undue Influence Prevention, connectedTo, Voter Registration>
+<Vote Counting, connectedTo, Voter Education Programs>
+<Voter Authentication, connectedTo, Undue Influence Prevention>
+<Voter Education Programs, connectedTo, Direct Recording Electronic Systems>
+<Voter Privacy Protection, connectedTo, Post_Election Audits>
+<Voter Privacy Protection, connectedTo, Results Aggregation>
+<Voter Privacy Protection, connectedTo, Voting Machine Design>
+<Voter Registration, connectedTo, Cryptographic Security>
+<Voting Machine Design, connectedTo, Results Aggregation>
+<Zero_Knowledge Proofs for Privacy, connectedTo, Vote Counting>
diff --git a/test/diagrams/graph_hard/diagrams_281.dot b/test/diagrams/graph_hard/diagrams_281.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b87898463fa9811b5523d48f5b4587a1eed4ad49
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_281.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=TB
+	N0 [label="Remote Voting Solutions" color="#C0CA33" fillcolor="#F9FBE7" shape=vnode_shape style=filled]
+	N1 [label="Legal Framework Compliance" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N2 [label="Security Protocols" color="#CB9BE1" fillcolor="#F2E6F5" shape=database style=filled]
+	N3 [label="Public Trust Building" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+	N4 [label="Voter Registration" color="#C0CA33" fillcolor="#F9FBE7" shape=document style=filled]
+	N5 [label="Risk Management for Elections" color="#CB9BE1" fillcolor="#F2E6F5" shape=diamond style=filled]
+	N6 [label="Cryptographic Security" color="#00BCD4" fillcolor="#E0F7FA" shape=multipledocuments style=filled]
+	N7 [label="Touchscreen Voting Machines" color="#C0CA33" fillcolor="#F9FBE7" shape=preparation style=filled]
+	N8 [label="Optical Scan Systems" color="#C0CA33" fillcolor="#F9FBE7" shape=action style=filled]
+	N9 [label="Voter Education Programs" color="#CB9BE1" fillcolor="#F2E6F5" shape=predefinedprocess style=filled]
+	N10 [label="Voter Authentication" color="#CB9BE1" fillcolor="#F2E6F5" shape=action style=filled]
+	N11 [label="Results Aggregation" color="#CB9BE1" fillcolor="#F2E6F5" shape=rect style=filled]
+	N12 [label="Biometric Voter ID" color="#C0CA33" fillcolor="#F9FBE7" shape=diamond style=filled]
+	N13 [label="Direct Recording Electronic Systems" color="#00BCD4" fillcolor="#E0F7FA" shape=diamond style=filled]
+	N14 [label="Anonymous Credential Systems" color="#CB9BE1" fillcolor="#F2E6F5" shape=inputoutput style=filled]
+	N15 [label="Secure Data Transmission" color="#00BCD4" fillcolor="#E0F7FA" shape=database style=filled]
+	N16 [label="Cybersecurity for Voting Systems" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	S0 [label="" color="#C0CA33" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#C0CA33" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Online Voting Systems {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Online Voting Systems"
+		nest0_0 [label="Hardware Tamper Detection" color="#00BCD4" fillcolor="#E0F7FA" shape=rectangle style=filled]
+		nest0_1 [label="Transparency" color="#C0CA33" fillcolor="#F9FBE7" shape=rectangle style=filled]
+		nest0_2 [label="Software Integrity Checks" color="#CB9BE1" fillcolor="#F2E6F5" shape=document style=filled]
+	}
+	subgraph cluster_Penetration Testing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Penetration Testing"
+		nest1_0 [label="Accessibility Features" color="#00BCD4" fillcolor="#E0F7FA" shape=inputoutput style=filled]
+		nest1_1 [label="Voting Machine Design" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+		nest1_2 [label="System Certification" color="#CB9BE1" fillcolor="#F2E6F5" shape=document style=filled]
+		nest1_3 [label="Threat Modeling" color="#00BCD4" fillcolor="#E0F7FA" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#CB9BE1" penwidth=1.5 style=solid label="implements" dir=forward]
+	N4 -> N5 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#CB9BE1" penwidth=1.5 style=dashed label="regulates" dir=forward]
+	N13 -> N14 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#CB9BE1" penwidth=1.5 style=dashed label="informs" dir=forward]
+	nest0_1 -> nest0_2 [color="#C0CA33" penwidth=1.5 style=dashed label="educates" dir=forward]
+	N2 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N10 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest1_0 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#C0CA33" penwidth=1.5 style=solid label="protects" dir=forward]
+	N10 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N8 -> M1 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N11 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M2 [color="#C0CA33" penwidth=1.5 style=solid label="tallies" dir=forward]
+	M2 -> N11 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_281.txt b/test/diagrams/graph_hard/diagrams_281.txt
new file mode 100644
index 0000000000000000000000000000000000000000..694d31b8f192a8ff97f04c3c734c4df761c97f57
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_281.txt
@@ -0,0 +1,35 @@
+<Accessibility Features, connectedTo, Voting Machine Design>
+<Anonymous Credential Systems, connectedTo, Secure Data Transmission>
+<Biometric Voter ID, regulates, Direct Recording Electronic Systems>
+<Cryptographic Security, connectedTo, Touchscreen Voting Machines>
+<Direct Recording Electronic Systems, connectedTo, Anonymous Credential Systems>
+<Hardware Tamper Detection, informs, Transparency>
+<Legal Framework Compliance, connectedTo, Results Aggregation>
+<Legal Framework Compliance, connectedTo, Security Protocols>
+<Optical Scan Systems, connectedTo, Results Aggregation>
+<Optical Scan Systems, connectedTo, Voter Education Programs>
+<Public Trust Building, connectedTo, Results Aggregation>
+<Public Trust Building, implements, Voter Registration>
+<Remote Voting Solutions, connectedTo, Legal Framework Compliance>
+<Remote Voting Solutions, connectedTo, Results Aggregation>
+<Results Aggregation, connectedTo, Biometric Voter ID>
+<Risk Management for Elections, connectedTo, Accessibility Features>
+<Risk Management for Elections, connectedTo, Cryptographic Security>
+<Secure Data Transmission, connectedTo, Cybersecurity for Voting Systems>
+<Security Protocols, connectedTo, Biometric Voter ID>
+<Security Protocols, connectedTo, Hardware Tamper Detection>
+<Security Protocols, connectedTo, Public Trust Building>
+<Security Protocols, connectedTo, Voter Registration>
+<Security Protocols, protects, Results Aggregation>
+<Software Integrity Checks, connectedTo, Voter Authentication>
+<System Certification, connectedTo, Threat Modeling>
+<Threat Modeling, connectedTo, Anonymous Credential Systems>
+<Touchscreen Voting Machines, connectedTo, Optical Scan Systems>
+<Transparency, educates, Software Integrity Checks>
+<Voter Authentication, connectedTo, Anonymous Credential Systems>
+<Voter Authentication, connectedTo, Biometric Voter ID>
+<Voter Authentication, connectedTo, Results Aggregation>
+<Voter Education Programs, connectedTo, Voter Authentication>
+<Voter Education Programs, tallies, Results Aggregation>
+<Voter Registration, connectedTo, Risk Management for Elections>
+<Voting Machine Design, connectedTo, System Certification>
diff --git a/test/diagrams/graph_hard/diagrams_282.dot b/test/diagrams/graph_hard/diagrams_282.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a6c5702132468af41f5ff2dd5c7a691da36f5030
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_282.dot
@@ -0,0 +1,85 @@
+digraph {
+	rankdir=LR
+	N0 [label="Biometric Voter ID" color="#AB47BC" fillcolor="#F3E5F5" shape=document style=filled]
+	N1 [label="Remote Voting Solutions" color="#AB47BC" fillcolor="#F3E5F5" shape=predefinedprocess style=filled]
+	N2 [label="Blockchain for Voting" color="#3F51B5" fillcolor="#C5CAE9" shape=action style=filled]
+	N3 [label="Election Official Training" color="#3F51B5" fillcolor="#C5CAE9" shape=rectangle style=filled]
+	N4 [label="Threat Modeling" color="#AB47BC" fillcolor="#F3E5F5" shape=action style=filled]
+	N5 [label="Secure Data Transmission" color="#A188DB" fillcolor="#DED7F0" shape=predefinedprocess style=filled]
+	N6 [label="Online Voting Systems" color="#AB47BC" fillcolor="#F3E5F5" shape=rect style=filled]
+	N7 [label="Zero_Knowledge Proofs for Privacy" color="#3F51B5" fillcolor="#C5CAE9" shape=diamond style=filled]
+	N8 [label="Voter Registration" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N9 [label="Software Integrity Checks" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N10 [label="Ballot Creation" color="#AB47BC" fillcolor="#F3E5F5" shape=document style=filled]
+	N11 [label="Cryptographic Security" color="#A188DB" fillcolor="#DED7F0" shape=rect style=filled]
+	N12 [label="Optical Scan Systems" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N13 [label="Voter Privacy Protection" color="#3F51B5" fillcolor="#C5CAE9" shape=multipledocuments style=filled]
+	N14 [label="Legal Framework Compliance" color="#3F51B5" fillcolor="#C5CAE9" shape=predefinedprocess style=filled]
+	N15 [label="Penetration Testing" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N16 [label="Accessibility Features" color="#AB47BC" fillcolor="#F3E5F5" shape=rect style=filled]
+	N17 [label="Direct Recording Electronic Systems" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N18 [label="Voter Authentication" color="#A188DB" fillcolor="#DED7F0" shape=action style=filled]
+	S0 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Vote Counting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Vote Counting"
+		nest0_0 [label="System Certification" color="#AB47BC" fillcolor="#F3E5F5" shape=preparation style=filled]
+		nest0_1 [label="Anonymous Credential Systems" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	}
+	subgraph cluster_Undue Influence Prevention {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Undue Influence Prevention"
+		nest1_0 [label="Cybersecurity for Voting Systems" color="#A188DB" fillcolor="#DED7F0" shape=rectangle style=filled]
+		nest1_1 [label="Touchscreen Voting Machines" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest1_2 [label="Results Aggregation" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+		nest1_3 [label="Post_Election Audits" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#AB47BC" penwidth=1.5 style=solid label="implements" dir=forward]
+	N10 -> N11 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#3F51B5" penwidth=1.5 style=dashed label="monitors" dir=forward]
+	N17 -> N18 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N15 -> nest1_0 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N13 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N13 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N18 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N17 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N16 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N9 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N18 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N15 -> M0 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	M0 -> N17 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#3F51B5" penwidth=1.5 style=dashed label="communicates" dir=forward]
+	M1 -> N4 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_282.txt b/test/diagrams/graph_hard/diagrams_282.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f683d817721215f740f5ecb076370f585837ed84
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_282.txt
@@ -0,0 +1,39 @@
+<Accessibility Features, monitors, Direct Recording Electronic Systems>
+<Anonymous Credential Systems, connectedTo, Online Voting Systems>
+<Ballot Creation, connectedTo, Cryptographic Security>
+<Biometric Voter ID, connectedTo, Direct Recording Electronic Systems>
+<Biometric Voter ID, connectedTo, Remote Voting Solutions>
+<Biometric Voter ID, connectedTo, Threat Modeling>
+<Blockchain for Voting, connectedTo, Election Official Training>
+<Blockchain for Voting, connectedTo, Threat Modeling>
+<Cryptographic Security, connectedTo, Optical Scan Systems>
+<Cybersecurity for Voting Systems, connectedTo, Touchscreen Voting Machines>
+<Direct Recording Electronic Systems, connectedTo, Voter Authentication>
+<Election Official Training, connectedTo, Threat Modeling>
+<Legal Framework Compliance, connectedTo, Penetration Testing>
+<Online Voting Systems, connectedTo, Direct Recording Electronic Systems>
+<Online Voting Systems, connectedTo, Zero_Knowledge Proofs for Privacy>
+<Optical Scan Systems, connectedTo, Voter Privacy Protection>
+<Penetration Testing, connectedTo, Accessibility Features>
+<Penetration Testing, connectedTo, Cybersecurity for Voting Systems>
+<Penetration Testing, connectedTo, Direct Recording Electronic Systems>
+<Post_Election Audits, connectedTo, Voter Privacy Protection>
+<Remote Voting Solutions, communicates, Threat Modeling>
+<Remote Voting Solutions, connectedTo, Blockchain for Voting>
+<Remote Voting Solutions, connectedTo, Direct Recording Electronic Systems>
+<Results Aggregation, connectedTo, Post_Election Audits>
+<Secure Data Transmission, connectedTo, Online Voting Systems>
+<Secure Data Transmission, connectedTo, System Certification>
+<Software Integrity Checks, connectedTo, Accessibility Features>
+<Software Integrity Checks, connectedTo, Voter Authentication>
+<Software Integrity Checks, implements, Ballot Creation>
+<System Certification, connectedTo, Anonymous Credential Systems>
+<Threat Modeling, connectedTo, Secure Data Transmission>
+<Touchscreen Voting Machines, connectedTo, Results Aggregation>
+<Voter Privacy Protection, connectedTo, Accessibility Features>
+<Voter Privacy Protection, connectedTo, Direct Recording Electronic Systems>
+<Voter Privacy Protection, connectedTo, Legal Framework Compliance>
+<Voter Privacy Protection, connectedTo, Penetration Testing>
+<Voter Privacy Protection, connectedTo, Voter Authentication>
+<Voter Registration, connectedTo, Software Integrity Checks>
+<Zero_Knowledge Proofs for Privacy, connectedTo, Voter Registration>
diff --git a/test/diagrams/graph_hard/diagrams_283.dot b/test/diagrams/graph_hard/diagrams_283.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b44fd60c496b524cf5eae7f4a50c9fb82cd9cae0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_283.dot
@@ -0,0 +1,58 @@
+digraph {
+	rankdir=BT
+	N0 [label="Policy Simulation Models" color="#9FA9E1" fillcolor="#D6D9F0" shape=predefinedprocess style=filled]
+	N1 [label="Behavioral Economics in Policy" color="#9FA9E1" fillcolor="#D6D9F0" shape=document style=filled]
+	N2 [label="Policy Brief Writing" color="#9FA9E1" fillcolor="#D6D9F0" shape=predefinedprocess style=filled]
+	N3 [label="Forecasting and Scenario Planning" color="#00BCD4" fillcolor="#B2EBF2" shape=inputoutput style=filled]
+	N4 [label="Interagency Coordination" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N5 [label="Local Government Policy" color="#9FA9E1" fillcolor="#D6D9F0" shape=multipledocuments style=filled]
+	N6 [label="Monitoring and Evaluation Framework" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N7 [label="Stakeholder Analysis" color="#00BCD4" fillcolor="#B2EBF2" shape=rectangle style=filled]
+	N8 [label="Public Consultation Process" color="#00BCD4" fillcolor="#B2EBF2" shape=rectangle style=filled]
+	N9 [label="Feasibility Study" color="#42A5F5" fillcolor="#F1F8FF" shape=rect style=filled]
+	S0 [label="" color="#42A5F5" fillcolor="#F1F8FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Data Visualization for Policy {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Data Visualization for Policy"
+		nest0_0 [label="Public Opinion Research" color="#00BCD4" fillcolor="#B2EBF2" shape=action style=filled]
+		nest0_1 [label="Program Design" color="#42A5F5" fillcolor="#F1F8FF" shape=rectangle style=filled]
+		nest0_2 [label="Presentation Skills" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+		nest0_3 [label="Advocacy Strategy" color="#00BCD4" fillcolor="#B2EBF2" shape=action style=filled]
+	}
+	subgraph cluster_Qualitative Analysis {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Qualitative Analysis"
+		nest1_0 [label="Non_profit Policy Influence" color="#00BCD4" fillcolor="#B2EBF2" shape=parallelogram style=filled]
+		nest1_1 [label="Recommendation Formulation" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+		nest1_2 [label="Impact Assessment" color="#42A5F5" fillcolor="#F1F8FF" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest0_0 [color="#000000" penwidth=1.5 style=solid label="solutions" dir=forward]
+	nest0_3 -> N3 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N6 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#42A5F5" penwidth=1.5 style=solid label="ethics" dir=forward]
+	S1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_283.txt b/test/diagrams/graph_hard/diagrams_283.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bebd9a5f56711d10944e06e4987e6ec8be1c57a2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_283.txt
@@ -0,0 +1,24 @@
+<Advocacy Strategy, connectedTo, Forecasting and Scenario Planning>
+<Behavioral Economics in Policy, connectedTo, Policy Brief Writing>
+<Forecasting and Scenario Planning, connectedTo, Interagency Coordination>
+<Impact Assessment, connectedTo, Monitoring and Evaluation Framework>
+<Interagency Coordination, connectedTo, Local Government Policy>
+<Interagency Coordination, connectedTo, Non_profit Policy Influence>
+<Interagency Coordination, solutions, Public Opinion Research>
+<Local Government Policy, connectedTo, Monitoring and Evaluation Framework>
+<Monitoring and Evaluation Framework, connectedTo, Stakeholder Analysis>
+<Non_profit Policy Influence, connectedTo, Recommendation Formulation>
+<Policy Brief Writing, connectedTo, Forecasting and Scenario Planning>
+<Policy Brief Writing, connectedTo, Local Government Policy>
+<Policy Brief Writing, connectedTo, Public Consultation Process>
+<Policy Brief Writing, connectedTo, Stakeholder Analysis>
+<Policy Simulation Models, connectedTo, Behavioral Economics in Policy>
+<Policy Simulation Models, connectedTo, Feasibility Study>
+<Policy Simulation Models, connectedTo, Interagency Coordination>
+<Policy Simulation Models, ethics, Public Consultation Process>
+<Presentation Skills, connectedTo, Advocacy Strategy>
+<Program Design, connectedTo, Presentation Skills>
+<Public Consultation Process, connectedTo, Feasibility Study>
+<Public Opinion Research, connectedTo, Program Design>
+<Recommendation Formulation, connectedTo, Impact Assessment>
+<Stakeholder Analysis, connectedTo, Public Consultation Process>
diff --git a/test/diagrams/graph_hard/diagrams_284.dot b/test/diagrams/graph_hard/diagrams_284.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b3866180378b4b6b02ea3e5c3839242f5a6089ce
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_284.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=TB
+	N0 [label="Data Visualization for Policy" color="#CD8FF2" fillcolor="#ECCFF5" shape=rect style=filled]
+	N1 [label="Risk Assessment" color="#CD8FF2" fillcolor="#ECCFF5" shape=database style=filled]
+	N2 [label="Program Design" color="#CD8FF2" fillcolor="#ECCFF5" shape=predefinedprocess style=filled]
+	N3 [label="Interagency Coordination" color="#CB9BE1" fillcolor="#F2E6F5" shape=rect style=filled]
+	N4 [label="Criteria Establishment" color="#CD8FF2" fillcolor="#ECCFF5" shape=action style=filled]
+	N5 [label="Problem Identification" color="#CD8FF2" fillcolor="#ECCFF5" shape=database style=filled]
+	N6 [label="Policy Advocacy and Lobbying" color="#CD8FF2" fillcolor="#ECCFF5" shape=rect style=filled]
+	N7 [label="Presentation Skills" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N8 [label="Recommendation Formulation" color="#B0C5CD" fillcolor="#DFE7EB" shape=rectangle style=filled]
+	N9 [label="Public Consultation Process" color="#CD8FF2" fillcolor="#ECCFF5" shape=rect style=filled]
+	S0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Report Drafting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Report Drafting"
+		nest0_0 [label="Stakeholder Analysis" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+		nest0_1 [label="Legal Review" color="#CB9BE1" fillcolor="#F2E6F5" shape=multipledocuments style=filled]
+		nest0_2 [label="Policy Brief Writing" color="#B0C5CD" fillcolor="#DFE7EB" shape=document style=filled]
+	}
+	subgraph cluster_Implementation Plan Development {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Implementation Plan Development"
+		nest1_0 [label="Communication Strategy" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+		nest1_1 [label="Qualitative Analysis" color="#CD8FF2" fillcolor="#ECCFF5" shape=preparation style=filled]
+		nest1_2 [label="Advocacy Strategy" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest0_0 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N6 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> S0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S0 -> N2 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S0 -> N3 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	M0 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_284.txt b/test/diagrams/graph_hard/diagrams_284.txt
new file mode 100644
index 0000000000000000000000000000000000000000..919798d57fa5affcd5eba6a11816ecde2c575344
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_284.txt
@@ -0,0 +1,24 @@
+<Advocacy Strategy, connectedTo, Policy Advocacy and Lobbying>
+<Communication Strategy, connectedTo, Qualitative Analysis>
+<Criteria Establishment, connectedTo, Presentation Skills>
+<Criteria Establishment, connectedTo, Problem Identification>
+<Data Visualization for Policy, connectedTo, Criteria Establishment>
+<Data Visualization for Policy, connectedTo, Interagency Coordination>
+<Data Visualization for Policy, connectedTo, Policy Advocacy and Lobbying>
+<Data Visualization for Policy, connectedTo, Program Design>
+<Data Visualization for Policy, connectedTo, Risk Assessment>
+<Interagency Coordination, connectedTo, Communication Strategy>
+<Interagency Coordination, connectedTo, Criteria Establishment>
+<Legal Review, connectedTo, Policy Brief Writing>
+<Policy Advocacy and Lobbying, connectedTo, Presentation Skills>
+<Policy Brief Writing, connectedTo, Policy Advocacy and Lobbying>
+<Presentation Skills, connectedTo, Recommendation Formulation>
+<Problem Identification, connectedTo, Policy Advocacy and Lobbying>
+<Program Design, connectedTo, Interagency Coordination>
+<Qualitative Analysis, connectedTo, Advocacy Strategy>
+<Recommendation Formulation, connectedTo, Public Consultation Process>
+<Recommendation Formulation, connectedTo, Stakeholder Analysis>
+<Risk Assessment, connectedTo, Interagency Coordination>
+<Risk Assessment, connectedTo, Presentation Skills>
+<Risk Assessment, connectedTo, Program Design>
+<Stakeholder Analysis, connectedTo, Legal Review>
diff --git a/test/diagrams/graph_hard/diagrams_285.dot b/test/diagrams/graph_hard/diagrams_285.dot
new file mode 100644
index 0000000000000000000000000000000000000000..beaf0a1a39d29d29b143118feddd263aa5e75e11
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_285.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=TB
+	N0 [label="International Policy Analysis" color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+	N1 [label="Monitoring and Evaluation Framework" color="#A1D7CD" fillcolor="#EDF5F3" shape=multipledocuments style=filled]
+	N2 [label="Quantitative Analysis" color="#CDDC39" fillcolor="#E6EE9C" shape=preparation style=filled]
+	N3 [label="Public Opinion Research" color="#A188D0" fillcolor="#DACBE3" shape=document style=filled]
+	N4 [label="Presentation Skills" color="#A188D0" fillcolor="#DACBE3" shape=preparation style=filled]
+	N5 [label="Program Design" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+	N6 [label="Impact Assessment" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N7 [label="Forecasting and Scenario Planning" color="#CDDC39" fillcolor="#E6EE9C" shape=vnode_shape style=filled]
+	N8 [label="Policy Advocacy and Lobbying" color="#A1D7CD" fillcolor="#EDF5F3" shape=preparation style=filled]
+	N9 [label="Budgetary Implications" color="#A188D0" fillcolor="#DACBE3" shape=preparation style=filled]
+	S0 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Communication Strategy {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Communication Strategy"
+		nest0_0 [label="Stakeholder Analysis" color="#CDDC39" fillcolor="#E6EE9C" shape=rect style=filled]
+		nest0_1 [label="Policy Simulation Models" color="#A188D0" fillcolor="#DACBE3" shape=document style=filled]
+		nest0_2 [label="Report Drafting" color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+	}
+	subgraph cluster_Recommendation Formulation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Recommendation Formulation"
+		nest1_0 [label="National Policy Development" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+		nest1_1 [label="Evidence_Based Policymaking" color="#CDDC39" fillcolor="#E6EE9C" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest0_0 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N2 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest1_0 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N2 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#A188D0" penwidth=1.5 style=solid label="develops" dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S2 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	M1 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M2 -> N6 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_285.txt b/test/diagrams/graph_hard/diagrams_285.txt
new file mode 100644
index 0000000000000000000000000000000000000000..95294158c68ead87cc9b9b6cf2203cc3970f00e3
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_285.txt
@@ -0,0 +1,26 @@
+<Evidence_Based Policymaking, connectedTo, Quantitative Analysis>
+<Forecasting and Scenario Planning, connectedTo, Policy Advocacy and Lobbying>
+<Impact Assessment, connectedTo, Forecasting and Scenario Planning>
+<International Policy Analysis, connectedTo, Monitoring and Evaluation Framework>
+<Monitoring and Evaluation Framework, connectedTo, Policy Advocacy and Lobbying>
+<Monitoring and Evaluation Framework, connectedTo, Quantitative Analysis>
+<National Policy Development, connectedTo, Evidence_Based Policymaking>
+<Policy Advocacy and Lobbying, connectedTo, Budgetary Implications>
+<Policy Simulation Models, connectedTo, Report Drafting>
+<Presentation Skills, connectedTo, Forecasting and Scenario Planning>
+<Presentation Skills, connectedTo, Impact Assessment>
+<Presentation Skills, connectedTo, Policy Advocacy and Lobbying>
+<Presentation Skills, connectedTo, Program Design>
+<Program Design, connectedTo, Forecasting and Scenario Planning>
+<Program Design, connectedTo, Impact Assessment>
+<Program Design, connectedTo, Policy Advocacy and Lobbying>
+<Program Design, connectedTo, Stakeholder Analysis>
+<Program Design, develops, Budgetary Implications>
+<Public Opinion Research, connectedTo, National Policy Development>
+<Public Opinion Research, connectedTo, Presentation Skills>
+<Quantitative Analysis, connectedTo, Impact Assessment>
+<Quantitative Analysis, connectedTo, Policy Advocacy and Lobbying>
+<Quantitative Analysis, connectedTo, Program Design>
+<Quantitative Analysis, connectedTo, Public Opinion Research>
+<Report Drafting, connectedTo, Quantitative Analysis>
+<Stakeholder Analysis, connectedTo, Policy Simulation Models>
diff --git a/test/diagrams/graph_hard/diagrams_286.dot b/test/diagrams/graph_hard/diagrams_286.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dff8760b0636d440b7f955a1f5b9990acddfe5e5
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_286.dot
@@ -0,0 +1,86 @@
+digraph {
+	rankdir=LR
+	N0 [label="Variable Identification" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N1 [label="Grant Proposal Writing" color="#CDDC39" fillcolor="#E6EE9C" shape=parallelogram style=filled]
+	N2 [label="Funding Agency Reporting" color="#CDDC39" fillcolor="#E6EE9C" shape=action style=filled]
+	N3 [label="Plagiarism Detection" color="#CDDC39" fillcolor="#E6EE9C" shape=rect style=filled]
+	N4 [label="Systematic Review" color="#61CAC3" fillcolor="#C2E8E6" shape=preparation style=filled]
+	N5 [label="Bias Mitigation" color="#795548" fillcolor="#D7CCC8" shape=database style=filled]
+	N6 [label="Thesis or Dissertation Writing" color="#CDDC39" fillcolor="#E6EE9C" shape=parallelogram style=filled]
+	N7 [label="Poster Session Preparation" color="#61CAC3" fillcolor="#C2E8E6" shape=database style=filled]
+	N8 [label="Research Question Refinement" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N9 [label="Data Analysis" color="#795548" fillcolor="#D7CCC8" shape=vnode_shape style=filled]
+	N10 [label="Research Design" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N11 [label="Meta_Analysis" color="#61CAC3" fillcolor="#C2E8E6" shape=predefinedprocess style=filled]
+	N12 [label="Research Collaboration" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N13 [label="Data Management Plan" color="#CDDC39" fillcolor="#E6EE9C" shape=vnode_shape style=filled]
+	N14 [label="Data Collection" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N15 [label="Model Building" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N16 [label="Journal Publication" color="#61CAC3" fillcolor="#C2E8E6" shape=rectangle style=filled]
+	S0 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#61CAC3" fillcolor="#C2E8E6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Citation Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Citation Management"
+		nest0_0 [label="Experiment Design" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+		nest0_1 [label="Statistical Analysis" color="#CDDC39" fillcolor="#E6EE9C" shape=preparation style=filled]
+		nest0_2 [label="Methodology Selection" color="#795548" fillcolor="#D7CCC8" shape=diamond style=filled]
+		nest0_3 [label="Sampling Techniques" color="#CDDC39" fillcolor="#E6EE9C" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Hypothesis Formulation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Hypothesis Formulation"
+		nest1_0 [label="Academic Mentorship" color="#CDDC39" fillcolor="#E6EE9C" shape=predefinedprocess style=filled]
+		nest1_1 [label="Reproducibility Studies" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+		nest1_2 [label="Intellectual Property in Research" color="#795548" fillcolor="#D7CCC8" shape=document style=filled]
+	}
+	N0 -> N1 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#795548" penwidth=1.5 style=solid label="investigates" dir=forward]
+	N6 -> N7 [color="#CDDC39" penwidth=1.5 style=solid label="researches" dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest0_0 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N3 [color="#000000" penwidth=1.5 style=solid label="presents" dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N8 [color="#CDDC39" penwidth=1.5 style=solid label="teaches" dir=forward]
+	N6 -> S0 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> S1 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S2 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	S2 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N10 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#61CAC3" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#61CAC3" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_286.txt b/test/diagrams/graph_hard/diagrams_286.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0132fd1ad7aa95a19adfd9efd19101f17fca26bc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_286.txt
@@ -0,0 +1,38 @@
+<Academic Mentorship, connectedTo, Reproducibility Studies>
+<Bias Mitigation, investigates, Thesis or Dissertation Writing>
+<Data Analysis, connectedTo, Research Design>
+<Data Collection, connectedTo, Academic Mentorship>
+<Data Collection, connectedTo, Model Building>
+<Data Management Plan, connectedTo, Data Collection>
+<Experiment Design, connectedTo, Statistical Analysis>
+<Funding Agency Reporting, connectedTo, Plagiarism Detection>
+<Funding Agency Reporting, connectedTo, Research Design>
+<Grant Proposal Writing, connectedTo, Funding Agency Reporting>
+<Grant Proposal Writing, connectedTo, Research Design>
+<Grant Proposal Writing, connectedTo, Thesis or Dissertation Writing>
+<Intellectual Property in Research, teaches, Research Question Refinement>
+<Meta_Analysis, connectedTo, Research Collaboration>
+<Methodology Selection, connectedTo, Sampling Techniques>
+<Model Building, connectedTo, Journal Publication>
+<Plagiarism Detection, connectedTo, Research Design>
+<Plagiarism Detection, connectedTo, Systematic Review>
+<Plagiarism Detection, connectedTo, Thesis or Dissertation Writing>
+<Poster Session Preparation, connectedTo, Research Question Refinement>
+<Reproducibility Studies, connectedTo, Intellectual Property in Research>
+<Research Collaboration, connectedTo, Data Management Plan>
+<Research Design, connectedTo, Meta_Analysis>
+<Research Question Refinement, connectedTo, Data Analysis>
+<Research Question Refinement, connectedTo, Experiment Design>
+<Sampling Techniques, presents, Plagiarism Detection>
+<Statistical Analysis, connectedTo, Methodology Selection>
+<Systematic Review, connectedTo, Bias Mitigation>
+<Systematic Review, connectedTo, Data Collection>
+<Systematic Review, connectedTo, Research Design>
+<Systematic Review, connectedTo, Thesis or Dissertation Writing>
+<Thesis or Dissertation Writing, connectedTo, Data Management Plan>
+<Thesis or Dissertation Writing, connectedTo, Meta_Analysis>
+<Thesis or Dissertation Writing, connectedTo, Model Building>
+<Thesis or Dissertation Writing, connectedTo, Research Collaboration>
+<Thesis or Dissertation Writing, connectedTo, Research Design>
+<Thesis or Dissertation Writing, researches, Poster Session Preparation>
+<Variable Identification, connectedTo, Grant Proposal Writing>
diff --git a/test/diagrams/graph_hard/diagrams_287.dot b/test/diagrams/graph_hard/diagrams_287.dot
new file mode 100644
index 0000000000000000000000000000000000000000..86087c27fe70fff55fed1ec0721e70ea9045eb2e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_287.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=BT
+	N0 [label="Presentation at Conferences" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N1 [label="Power Analysis" color="#795548" fillcolor="#D7CCC8" shape=predefinedprocess style=filled]
+	N2 [label="Reproducibility Studies" color="#795548" fillcolor="#D7CCC8" shape=multipledocuments style=filled]
+	N3 [label="Peer Review Process" color="#F06292" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N4 [label="Systematic Review" color="#9C27B0" fillcolor="#E1BEE7" shape=predefinedprocess style=filled]
+	N5 [label="Data Analysis" color="#795548" fillcolor="#D7CCC8" shape=predefinedprocess style=filled]
+	N6 [label="Bias Mitigation" color="#F06292" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N7 [label="Sampling Techniques" color="#795548" fillcolor="#D7CCC8" shape=preparation style=filled]
+	N8 [label="Meta_Analysis" color="#795548" fillcolor="#D7CCC8" shape=rectangle style=filled]
+	N9 [label="Theory Development" color="#9C27B0" fillcolor="#E1BEE7" shape=predefinedprocess style=filled]
+	S0 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Qualitative Analysis {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Qualitative Analysis"
+		nest0_0 [label="Data Collection" color="#F06292" fillcolor="#FCE4EC" shape=action style=filled]
+		nest0_1 [label="Public Engagement with Research" color="#795548" fillcolor="#D7CCC8" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Model Building {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Model Building"
+		nest1_0 [label="Research Ethics Application" color="#F06292" fillcolor="#FCE4EC" shape=vnode_shape style=filled]
+		nest1_1 [label="Data Visualization for Research" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+		nest1_2 [label="Plagiarism Detection" color="#795548" fillcolor="#D7CCC8" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#795548" penwidth=1.5 style=dashed label="integrity" dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#795548" penwidth=1.5 style=solid label="studies" dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N2 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N4 -> S1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N7 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	M1 -> N8 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_287.txt b/test/diagrams/graph_hard/diagrams_287.txt
new file mode 100644
index 0000000000000000000000000000000000000000..278e972b4559afee1567925cbca4cc6bf9ac5e2b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_287.txt
@@ -0,0 +1,22 @@
+<Bias Mitigation, connectedTo, Data Collection>
+<Bias Mitigation, studies, Sampling Techniques>
+<Data Analysis, connectedTo, Bias Mitigation>
+<Data Collection, connectedTo, Public Engagement with Research>
+<Data Visualization for Research, connectedTo, Plagiarism Detection>
+<Meta_Analysis, connectedTo, Theory Development>
+<Peer Review Process, connectedTo, Meta_Analysis>
+<Peer Review Process, connectedTo, Systematic Review>
+<Plagiarism Detection, connectedTo, Reproducibility Studies>
+<Power Analysis, connectedTo, Reproducibility Studies>
+<Power Analysis, connectedTo, Sampling Techniques>
+<Presentation at Conferences, connectedTo, Power Analysis>
+<Public Engagement with Research, connectedTo, Data Analysis>
+<Reproducibility Studies, connectedTo, Peer Review Process>
+<Reproducibility Studies, connectedTo, Sampling Techniques>
+<Research Ethics Application, connectedTo, Data Visualization for Research>
+<Sampling Techniques, connectedTo, Meta_Analysis>
+<Systematic Review, connectedTo, Bias Mitigation>
+<Systematic Review, connectedTo, Meta_Analysis>
+<Systematic Review, connectedTo, Research Ethics Application>
+<Systematic Review, connectedTo, Sampling Techniques>
+<Systematic Review, integrity, Data Analysis>
diff --git a/test/diagrams/graph_hard/diagrams_288.dot b/test/diagrams/graph_hard/diagrams_288.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d29141f9b548c0bf3d814c53299dc29cd953a2da
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_288.dot
@@ -0,0 +1,88 @@
+digraph {
+	rankdir=TB
+	N0 [label="Survey Design" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N1 [label="Reproducibility Studies" color="#BCB88A" fillcolor="#F5F5DC" shape=action style=filled]
+	N2 [label="Funding Agency Reporting" color="#00BCD4" fillcolor="#B2EBF2" shape=rectangle style=filled]
+	N3 [label="Research Design" color="#00BCD4" fillcolor="#B2EBF2" shape=diamond style=filled]
+	N4 [label="Research Impact Assessment" color="#00BCD4" fillcolor="#B2EBF2" shape=preparation style=filled]
+	N5 [label="Literature Review" color="#A1887F" fillcolor="#EFEBE9" shape=rect style=filled]
+	N6 [label="Manuscript Writing" color="#00BCD4" fillcolor="#B2EBF2" shape=document style=filled]
+	N7 [label="Academic Mentorship" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N8 [label="Research Collaboration" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N9 [label="Research Question Refinement" color="#00BCD4" fillcolor="#B2EBF2" shape=action style=filled]
+	N10 [label="Methodology Selection" color="#00BCD4" fillcolor="#B2EBF2" shape=action style=filled]
+	N11 [label="Plagiarism Detection" color="#00BCD4" fillcolor="#B2EBF2" shape=inputoutput style=filled]
+	N12 [label="Poster Session Preparation" color="#A1887F" fillcolor="#EFEBE9" shape=rectangle style=filled]
+	N13 [label="Data Management Plan" color="#00BCD4" fillcolor="#B2EBF2" shape=inputoutput style=filled]
+	N14 [label="Peer Review Process" color="#A1887F" fillcolor="#EFEBE9" shape=predefinedprocess style=filled]
+	N15 [label="Data Visualization for Research" color="#BCB88A" fillcolor="#F5F5DC" shape=rect style=filled]
+	N16 [label="Journal Publication" color="#00BCD4" fillcolor="#B2EBF2" shape=rectangle style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Citation Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Citation Management"
+		nest0_0 [label="Grant Proposal Writing" color="#A1887F" fillcolor="#EFEBE9" shape=preparation style=filled]
+		nest0_1 [label="Public Engagement with Research" color="#BCB88A" fillcolor="#F5F5DC" shape=vnode_shape style=filled]
+		nest0_2 [label="Variable Identification" color="#00BCD4" fillcolor="#B2EBF2" shape=inputoutput style=filled]
+		nest0_3 [label="Systematic Review" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	}
+	subgraph cluster_Meta_Analysis {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Meta_Analysis"
+		nest1_0 [label="Power Analysis" color="#A1887F" fillcolor="#EFEBE9" shape=inputoutput style=filled]
+		nest1_1 [label="Research Ethics Application" color="#00BCD4" fillcolor="#B2EBF2" shape=multipledocuments style=filled]
+		nest1_2 [label="Hypothesis Formulation" color="#A1887F" fillcolor="#EFEBE9" shape=predefinedprocess style=filled]
+		nest1_3 [label="Experiment Design" color="#00BCD4" fillcolor="#B2EBF2" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed label="innovates" dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#A1887F" penwidth=1.5 style=dashed label="educates" dir=forward]
+	N13 -> N14 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest0_0 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N13 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#A1887F" penwidth=1.5 style=dashed label="edits" dir=forward]
+	N4 -> nest1_0 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N15 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N10 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N6 -> S1 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N16 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N10 -> S2 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N16 [color="#A1887F" penwidth=1.5 style=solid label="develops" dir=forward]
+	S2 -> N13 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N11 -> M0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N10 -> M0 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M1 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N9 -> M1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N12 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_288.txt b/test/diagrams/graph_hard/diagrams_288.txt
new file mode 100644
index 0000000000000000000000000000000000000000..124b554ecc2b7f492ff07ca5874a30b9d138573f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_288.txt
@@ -0,0 +1,42 @@
+<Academic Mentorship, connectedTo, Research Collaboration>
+<Data Management Plan, connectedTo, Peer Review Process>
+<Data Visualization for Research, connectedTo, Journal Publication>
+<Experiment Design, connectedTo, Data Visualization for Research>
+<Experiment Design, partOf, Experiment Design>
+<Funding Agency Reporting, connectedTo, Data Management Plan>
+<Funding Agency Reporting, connectedTo, Research Design>
+<Grant Proposal Writing, connectedTo, Public Engagement with Research>
+<Hypothesis Formulation, edits, Experiment Design>
+<Hypothesis Formulation, partOf, Hypothesis Formulation>
+<Literature Review, connectedTo, Manuscript Writing>
+<Literature Review, connectedTo, Poster Session Preparation>
+<Manuscript Writing, connectedTo, Academic Mentorship>
+<Manuscript Writing, connectedTo, Journal Publication>
+<Manuscript Writing, connectedTo, Poster Session Preparation>
+<Methodology Selection, connectedTo, Data Management Plan>
+<Methodology Selection, connectedTo, Data Visualization for Research>
+<Methodology Selection, connectedTo, Peer Review Process>
+<Methodology Selection, connectedTo, Plagiarism Detection>
+<Methodology Selection, develops, Journal Publication>
+<Peer Review Process, connectedTo, Data Visualization for Research>
+<Plagiarism Detection, connectedTo, Data Management Plan>
+<Plagiarism Detection, connectedTo, Poster Session Preparation>
+<Poster Session Preparation, connectedTo, Grant Proposal Writing>
+<Poster Session Preparation, educates, Data Management Plan>
+<Power Analysis, connectedTo, Research Ethics Application>
+<Power Analysis, partOf, Power Analysis>
+<Public Engagement with Research, connectedTo, Variable Identification>
+<Reproducibility Studies, connectedTo, Funding Agency Reporting>
+<Research Collaboration, connectedTo, Poster Session Preparation>
+<Research Collaboration, innovates, Research Question Refinement>
+<Research Design, connectedTo, Research Impact Assessment>
+<Research Ethics Application, connectedTo, Hypothesis Formulation>
+<Research Ethics Application, partOf, Research Ethics Application>
+<Research Impact Assessment, connectedTo, Data Management Plan>
+<Research Impact Assessment, connectedTo, Literature Review>
+<Research Impact Assessment, connectedTo, Power Analysis>
+<Research Question Refinement, connectedTo, Methodology Selection>
+<Research Question Refinement, connectedTo, Poster Session Preparation>
+<Survey Design, connectedTo, Reproducibility Studies>
+<Systematic Review, connectedTo, Data Management Plan>
+<Variable Identification, connectedTo, Systematic Review>
diff --git a/test/diagrams/graph_hard/diagrams_289.dot b/test/diagrams/graph_hard/diagrams_289.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9910976481b10610f54afc57c7bb338a3eb80563
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_289.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=LR
+	N0 [label="Open Access Repository Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=rect style=filled]
+	N1 [label="Interlibrary Loan" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N2 [label="Preservation of Materials" color="#6FE1D5" fillcolor="#C9EFEC" shape=rectangle style=filled]
+	N3 [label="Mobile App for Library" color="#6EB76D" fillcolor="#E9F7E8" shape=database style=filled]
+	N4 [label="Library Management Systems" color="#9FA9E1" fillcolor="#D6D9F0" shape=action style=filled]
+	N5 [label="Metadata Creation" color="#9FA9E1" fillcolor="#D6D9F0" shape=inputoutput style=filled]
+	N6 [label="Circulation Management" color="#6EB76D" fillcolor="#E9F7E8" shape=document style=filled]
+	N7 [label="Integrated Library Systems" color="#6FE1D5" fillcolor="#C9EFEC" shape=action style=filled]
+	N8 [label="User Training on Systems" color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+	N9 [label="Data Migration" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N10 [label="RFID System Implementation" color="#9FA9E1" fillcolor="#D6D9F0" shape=rectangle style=filled]
+	N11 [label="Search Functionality" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N12 [label="Digital Resource Management" color="#6EB76D" fillcolor="#E9F7E8" shape=document style=filled]
+	N13 [label="Technical Support for Systems" color="#6FE1D5" fillcolor="#C9EFEC" shape=rectangle style=filled]
+	N14 [label="System Security" color="#9FA9E1" fillcolor="#D6D9F0" shape=rect style=filled]
+	N15 [label="Resource Sharing Networks" color="#9FA9E1" fillcolor="#D6D9F0" shape=rect style=filled]
+	N16 [label="Self_Checkout Kiosks" color="#9FA9E1" fillcolor="#D6D9F0" shape=database style=filled]
+	N17 [label="Automated Materials Handling" color="#6FE1D5" fillcolor="#C9EFEC" shape=document style=filled]
+	S0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Discovery Layers {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Discovery Layers"
+		nest0_0 [label="Reporting and Analytics" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+		nest0_1 [label="Digitization Projects" color="#9FA9E1" fillcolor="#D6D9F0" shape=rectangle style=filled]
+	}
+	subgraph cluster_Authority Control {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Authority Control"
+		nest1_0 [label="Archival Integration" color="#6FE1D5" fillcolor="#C9EFEC" shape=document style=filled]
+		nest1_1 [label="Linked Data for Libraries" color="#6EB76D" fillcolor="#E9F7E8" shape=predefinedprocess style=filled]
+		nest1_2 [label="Acquisitions" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+		nest1_3 [label="Subject Indexing" color="#6FE1D5" fillcolor="#C9EFEC" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed label="assists" dir=forward]
+	N1 -> N2 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#6FE1D5" penwidth=1.5 style=dashed label="fines" dir=forward]
+	N4 -> N5 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#6EB76D" penwidth=1.5 style=dashed label="retrieves" dir=forward]
+	N6 -> N7 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid label="trains" dir=forward]
+	N9 -> N10 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#9FA9E1" penwidth=1.5 style=dashed label="organizes" dir=forward]
+	N16 -> N17 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#6FE1D5" penwidth=1.5 style=solid label="analyzes" dir=forward]
+	N14 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N10 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest1_0 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> S0 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N16 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N8 -> S1 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N17 [color="#9FA9E1" penwidth=1.5 style=dashed label="implements" dir=forward]
+	N6 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=dashed label="lends" dir=forward]
+	M1 -> N5 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_289.txt b/test/diagrams/graph_hard/diagrams_289.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fa44fb41dbc336255ec958da57094ef60ba6c455
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_289.txt
@@ -0,0 +1,36 @@
+<Acquisitions, connectedTo, Subject Indexing>
+<Archival Integration, connectedTo, Linked Data for Libraries>
+<Circulation Management, connectedTo, Integrated Library Systems>
+<Circulation Management, connectedTo, User Training on Systems>
+<Data Migration, connectedTo, RFID System Implementation>
+<Digital Resource Management, connectedTo, Resource Sharing Networks>
+<Digital Resource Management, connectedTo, Self_Checkout Kiosks>
+<Digital Resource Management, connectedTo, System Security>
+<Digital Resource Management, connectedTo, Technical Support for Systems>
+<Digitization Projects, connectedTo, RFID System Implementation>
+<Integrated Library Systems, connectedTo, User Training on Systems>
+<Interlibrary Loan, connectedTo, Metadata Creation>
+<Interlibrary Loan, connectedTo, Preservation of Materials>
+<Library Management Systems, connectedTo, Metadata Creation>
+<Linked Data for Libraries, connectedTo, Acquisitions>
+<Metadata Creation, retrieves, Circulation Management>
+<Mobile App for Library, connectedTo, Archival Integration>
+<Mobile App for Library, connectedTo, User Training on Systems>
+<Mobile App for Library, fines, Library Management Systems>
+<Open Access Repository Management, assists, Interlibrary Loan>
+<Open Access Repository Management, connectedTo, Metadata Creation>
+<Open Access Repository Management, connectedTo, User Training on Systems>
+<Preservation of Materials, connectedTo, Mobile App for Library>
+<Preservation of Materials, lends, Metadata Creation>
+<RFID System Implementation, connectedTo, Search Functionality>
+<Reporting and Analytics, analyzes, Digitization Projects>
+<Resource Sharing Networks, organizes, Self_Checkout Kiosks>
+<Search Functionality, connectedTo, Digital Resource Management>
+<Self_Checkout Kiosks, connectedTo, Automated Materials Handling>
+<Subject Indexing, connectedTo, Data Migration>
+<System Security, connectedTo, Reporting and Analytics>
+<System Security, connectedTo, Resource Sharing Networks>
+<Technical Support for Systems, connectedTo, System Security>
+<User Training on Systems, connectedTo, Search Functionality>
+<User Training on Systems, implements, Automated Materials Handling>
+<User Training on Systems, trains, Data Migration>
diff --git a/test/diagrams/graph_hard/diagrams_29.dot b/test/diagrams/graph_hard/diagrams_29.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cb676603c329a33b9083c257e48e5380d336da93
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_29.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=LR
+	N0 [label="Bill Generation" color="#9575CD" fillcolor="#EDE7F6" shape=rect style=filled]
+	N1 [label="Fraudulent Call Blocking" color="#B0C5CD" fillcolor="#DFE7EB" shape=database style=filled]
+	N2 [label="SMS Delivery" color="#B0C5CD" fillcolor="#DFE7EB" shape=vnode_shape style=filled]
+	N3 [label="Plan Suspension" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N4 [label="Issue Resolution" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N5 [label="Payment Received" color="#F06292" fillcolor="#FCE4EC" shape=action style=filled]
+	N6 [label="SIM Registration" color="#F06292" fillcolor="#FCE4EC" shape=action style=filled]
+	S0 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Service Level Agreement {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Service Level Agreement"
+		nest0_0 [label="Spectrum Management" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+		nest0_1 [label="Service Activation Request" color="#9575CD" fillcolor="#EDE7F6" shape=multipledocuments style=filled]
+		nest0_2 [label="MMS Transmission" color="#F06292" fillcolor="#FCE4EC" shape=rectangle style=filled]
+		nest0_3 [label="Service Complaint" color="#F06292" fillcolor="#FCE4EC" shape=rectangle style=filled]
+	}
+	subgraph cluster_VoIP Service {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="VoIP Service"
+		nest1_0 [label="Antenna Maintenance" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_1 [label="Call Recording" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+		nest1_2 [label="Billing Inquiry" color="#B0C5CD" fillcolor="#DFE7EB" shape=rectangle style=filled]
+		nest1_3 [label="Customer Relationship Management" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	}
+	N0 -> N1 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid label="disconnects" dir=forward]
+	N3 -> N4 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> nest0_0 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N2 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N6 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N4 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M2 -> N3 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_29.txt b/test/diagrams/graph_hard/diagrams_29.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cb74e645e7676ce34e743ba93de2bca00072a795
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_29.txt
@@ -0,0 +1,22 @@
+<Antenna Maintenance, connectedTo, Call Recording>
+<Bill Generation, connectedTo, Fraudulent Call Blocking>
+<Bill Generation, connectedTo, Plan Suspension>
+<Billing Inquiry, connectedTo, Customer Relationship Management>
+<Call Recording, connectedTo, Billing Inquiry>
+<Customer Relationship Management, connectedTo, SIM Registration>
+<Fraudulent Call Blocking, connectedTo, Plan Suspension>
+<Fraudulent Call Blocking, connectedTo, SMS Delivery>
+<Issue Resolution, connectedTo, Antenna Maintenance>
+<Issue Resolution, connectedTo, Payment Received>
+<MMS Transmission, connectedTo, Service Complaint>
+<Payment Received, connectedTo, SIM Registration>
+<Plan Suspension, connectedTo, Issue Resolution>
+<Plan Suspension, connectedTo, Payment Received>
+<Plan Suspension, connectedTo, SIM Registration>
+<SMS Delivery, connectedTo, Issue Resolution>
+<SMS Delivery, connectedTo, SIM Registration>
+<SMS Delivery, connectedTo, Spectrum Management>
+<SMS Delivery, disconnects, Plan Suspension>
+<Service Activation Request, connectedTo, MMS Transmission>
+<Service Complaint, connectedTo, SMS Delivery>
+<Spectrum Management, connectedTo, Service Activation Request>
diff --git a/test/diagrams/graph_hard/diagrams_290.dot b/test/diagrams/graph_hard/diagrams_290.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0a2ff8c8790aab6e1e9977b4f20defa7ad902f9f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_290.dot
@@ -0,0 +1,92 @@
+digraph {
+	rankdir=RL
+	N0 [label="Preservation of Materials" color="#795548" fillcolor="#D7CCC8" shape=rect style=filled]
+	N1 [label="Digitization Projects" color="#795548" fillcolor="#D7CCC8" shape=document style=filled]
+	N2 [label="Interlibrary Loan" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N3 [label="Digital Resource Management" color="#00BCD4" fillcolor="#E0F7FA" shape=preparation style=filled]
+	N4 [label="Mobile App for Library" color="#795548" fillcolor="#D7CCC8" shape=vnode_shape style=filled]
+	N5 [label="User Account Management" color="#FFCC80" fillcolor="#FFF0CC" shape=preparation style=filled]
+	N6 [label="Reporting and Analytics" color="#FFCC80" fillcolor="#FFF0CC" shape=database style=filled]
+	N7 [label="Acquisitions" color="#00BCD4" fillcolor="#E0F7FA" shape=multipledocuments style=filled]
+	N8 [label="Metadata Creation" color="#795548" fillcolor="#D7CCC8" shape=document style=filled]
+	N9 [label="Serials Control" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N10 [label="Integrated Library Systems" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N11 [label="Cataloging and Classification" color="#FFCC80" fillcolor="#FFF0CC" shape=multipledocuments style=filled]
+	N12 [label="Open Access Repository Management" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N13 [label="Data Migration" color="#FFCC80" fillcolor="#FFF0CC" shape=database style=filled]
+	N14 [label="Library Management Systems" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N15 [label="Electronic Resource Management" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N16 [label="Personalized Recommendations" color="#FFCC80" fillcolor="#FFF0CC" shape=inputoutput style=filled]
+	N17 [label="Discovery Layers" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFCC80" fillcolor="#FFF0CC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Patron Services {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Patron Services"
+		nest0_0 [label="Online Public Access Catalog" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest0_1 [label="Library Website Management" color="#00BCD4" fillcolor="#E0F7FA" shape=multipledocuments style=filled]
+		nest0_2 [label="Linked Data for Libraries" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	}
+	subgraph cluster_System Security {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="System Security"
+		nest1_0 [label="Self_Checkout Kiosks" color="#00BCD4" fillcolor="#E0F7FA" shape=rectangle style=filled]
+		nest1_1 [label="Reference Desk Support" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+		nest1_2 [label="User Training on Systems" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#00BCD4" penwidth=1.5 style=solid label="acquires" dir=forward]
+	N6 -> N7 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N17 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N9 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N17 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S1 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> S2 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	S2 -> N13 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N15 [color="#000000" penwidth=1.5 style=dashed label="organizes" dir=forward]
+	S2 -> N8 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	M0 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#00BCD4" penwidth=1.5 style=dashed label="fines" dir=forward]
+	M1 -> N7 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M2 [color="#00BCD4" penwidth=1.5 style=solid label="processes" dir=forward]
+	M2 -> N11 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_290.txt b/test/diagrams/graph_hard/diagrams_290.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6b8564dca47f8d45b2d1e06c1fbd05454a01c062
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_290.txt
@@ -0,0 +1,43 @@
+<Acquisitions, connectedTo, Metadata Creation>
+<Cataloging and Classification, connectedTo, Open Access Repository Management>
+<Data Migration, connectedTo, Library Management Systems>
+<Digital Resource Management, connectedTo, Mobile App for Library>
+<Digitization Projects, connectedTo, Acquisitions>
+<Digitization Projects, connectedTo, Discovery Layers>
+<Digitization Projects, connectedTo, Integrated Library Systems>
+<Digitization Projects, connectedTo, Interlibrary Loan>
+<Digitization Projects, connectedTo, Mobile App for Library>
+<Digitization Projects, connectedTo, User Account Management>
+<Electronic Resource Management, connectedTo, Personalized Recommendations>
+<Integrated Library Systems, connectedTo, Cataloging and Classification>
+<Interlibrary Loan, connectedTo, Cataloging and Classification>
+<Interlibrary Loan, connectedTo, Digital Resource Management>
+<Interlibrary Loan, connectedTo, Mobile App for Library>
+<Interlibrary Loan, fines, Acquisitions>
+<Library Management Systems, connectedTo, Electronic Resource Management>
+<Library Website Management, connectedTo, Linked Data for Libraries>
+<Linked Data for Libraries, connectedTo, Discovery Layers>
+<Metadata Creation, connectedTo, Serials Control>
+<Mobile App for Library, connectedTo, Acquisitions>
+<Mobile App for Library, connectedTo, User Account Management>
+<Online Public Access Catalog, connectedTo, Library Website Management>
+<Open Access Repository Management, connectedTo, Data Migration>
+<Personalized Recommendations, connectedTo, Discovery Layers>
+<Preservation of Materials, connectedTo, Digitization Projects>
+<Preservation of Materials, connectedTo, Mobile App for Library>
+<Reference Desk Support, connectedTo, User Training on Systems>
+<Reporting and Analytics, connectedTo, Acquisitions>
+<Reporting and Analytics, connectedTo, Library Management Systems>
+<Reporting and Analytics, connectedTo, Online Public Access Catalog>
+<Reporting and Analytics, connectedTo, Open Access Repository Management>
+<Self_Checkout Kiosks, connectedTo, Reference Desk Support>
+<Serials Control, connectedTo, Integrated Library Systems>
+<Serials Control, connectedTo, Self_Checkout Kiosks>
+<Serials Control, processes, Cataloging and Classification>
+<User Account Management, acquires, Reporting and Analytics>
+<User Account Management, connectedTo, Acquisitions>
+<User Account Management, connectedTo, Data Migration>
+<User Account Management, connectedTo, Integrated Library Systems>
+<User Account Management, connectedTo, Metadata Creation>
+<User Account Management, organizes, Electronic Resource Management>
+<User Training on Systems, connectedTo, Serials Control>
diff --git a/test/diagrams/graph_hard/diagrams_291.dot b/test/diagrams/graph_hard/diagrams_291.dot
new file mode 100644
index 0000000000000000000000000000000000000000..58b53b18b4027712820093fc42d2449cd7e7b971
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_291.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=TB
+	N0 [label="Patron Services" color="#94C0C0" fillcolor="#CADEDE" shape=rectangle style=filled]
+	N1 [label="Interlibrary Loan" color="#94C0C0" fillcolor="#CADEDE" shape=database style=filled]
+	N2 [label="User Account Management" color="#A1887F" fillcolor="#EFEBE9" shape=action style=filled]
+	N3 [label="Discovery Layers" color="#A2D0FF" fillcolor="#E8F0FF" shape=database style=filled]
+	N4 [label="System Upgrades" color="#94C0C0" fillcolor="#CADEDE" shape=predefinedprocess style=filled]
+	N5 [label="User Training on Systems" color="#94C0C0" fillcolor="#CADEDE" shape=inputoutput style=filled]
+	N6 [label="RFID System Implementation" color="#A2D0FF" fillcolor="#E8F0FF" shape=multipledocuments style=filled]
+	N7 [label="Linked Data for Libraries" color="#A1887F" fillcolor="#EFEBE9" shape=rect style=filled]
+	N8 [label="Collection Development" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+	N9 [label="Federated Search" color="#A1887F" fillcolor="#EFEBE9" shape=vnode_shape style=filled]
+	N10 [label="Cataloging and Classification" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	S0 [label="" color="#94C0C0" fillcolor="#CADEDE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#A1887F" fillcolor="#EFEBE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#A2D0FF" fillcolor="#E8F0FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A1887F" fillcolor="#EFEBE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Acquisitions {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Acquisitions"
+		nest0_0 [label="Authority Control" color="#A1887F" fillcolor="#EFEBE9" shape=vnode_shape style=filled]
+		nest0_1 [label="Database Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=action style=filled]
+		nest0_2 [label="Subject Indexing" color="#94C0C0" fillcolor="#CADEDE" shape=database style=filled]
+		nest0_3 [label="Digitization Projects" color="#A1887F" fillcolor="#EFEBE9" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Search Functionality {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Search Functionality"
+		nest1_0 [label="Online Public Access Catalog" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+		nest1_1 [label="Library Website Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+		nest1_2 [label="Library Management Systems" color="#A2D0FF" fillcolor="#E8F0FF" shape=action style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#94C0C0" penwidth=1.5 style=solid label="processes" dir=forward]
+	N8 -> N9 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N10 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N4 -> S2 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N8 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_291.txt b/test/diagrams/graph_hard/diagrams_291.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b69fa4a7299b601965edae22da2174b871239b0e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_291.txt
@@ -0,0 +1,31 @@
+<Authority Control, connectedTo, Database Management>
+<Authority Control, partOf, Authority Control>
+<Collection Development, connectedTo, Federated Search>
+<Database Management, connectedTo, Subject Indexing>
+<Database Management, partOf, Database Management>
+<Digitization Projects, connectedTo, Cataloging and Classification>
+<Digitization Projects, partOf, Digitization Projects>
+<Discovery Layers, connectedTo, System Upgrades>
+<Federated Search, connectedTo, Cataloging and Classification>
+<Federated Search, connectedTo, Online Public Access Catalog>
+<Interlibrary Loan, connectedTo, Discovery Layers>
+<Interlibrary Loan, connectedTo, User Account Management>
+<Library Management Systems, connectedTo, Cataloging and Classification>
+<Library Website Management, connectedTo, Library Management Systems>
+<Linked Data for Libraries, processes, Collection Development>
+<Online Public Access Catalog, connectedTo, Library Website Management>
+<Patron Services, connectedTo, Discovery Layers>
+<Patron Services, connectedTo, Interlibrary Loan>
+<RFID System Implementation, connectedTo, Linked Data for Libraries>
+<Subject Indexing, connectedTo, Digitization Projects>
+<Subject Indexing, partOf, Subject Indexing>
+<System Upgrades, connectedTo, Collection Development>
+<System Upgrades, connectedTo, RFID System Implementation>
+<System Upgrades, connectedTo, User Training on Systems>
+<User Account Management, connectedTo, Discovery Layers>
+<User Training on Systems, connectedTo, Authority Control>
+<User Training on Systems, connectedTo, Cataloging and Classification>
+<User Training on Systems, connectedTo, Collection Development>
+<User Training on Systems, connectedTo, Federated Search>
+<User Training on Systems, connectedTo, Linked Data for Libraries>
+<User Training on Systems, connectedTo, RFID System Implementation>
diff --git a/test/diagrams/graph_hard/diagrams_292.dot b/test/diagrams/graph_hard/diagrams_292.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e1a506f1418109ffc4bc5c38cb07c0a92164852b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_292.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=TB
+	N0 [label="Oral History Collection" color="#A1D7CD" fillcolor="#EDF5F3" shape=parallelogram style=filled]
+	N1 [label="Web Archiving" color="#64B5F6" fillcolor="#E3F2FD" shape=rect style=filled]
+	N2 [label="Archival Advocacy" color="#A1D7CD" fillcolor="#EDF5F3" shape=rectangle style=filled]
+	N3 [label="Digitization of Records" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+	N4 [label="Preservation Planning" color="#64B5F6" fillcolor="#E3F2FD" shape=document style=filled]
+	N5 [label="Digital Asset Management" color="#64B5F6" fillcolor="#E3F2FD" shape=multipledocuments style=filled]
+	N6 [label="Acquisition and Accessioning" color="#A1D7CD" fillcolor="#EDF5F3" shape=multipledocuments style=filled]
+	N7 [label="Disaster Preparedness for Archives" color="#82DAFF" fillcolor="#C8EDFF" shape=database style=filled]
+	N8 [label="Emulation for Obsolete Formats" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+	N9 [label="Digital Forensics for Archives" color="#82DAFF" fillcolor="#C8EDFF" shape=parallelogram style=filled]
+	N10 [label="Long_Term Digital Preservation" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N11 [label="Community Archiving Projects" color="#82DAFF" fillcolor="#C8EDFF" shape=database style=filled]
+	N12 [label="Security of Holdings" color="#82DAFF" fillcolor="#C8EDFF" shape=multipledocuments style=filled]
+	N13 [label="Grant Writing for Archives" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	S0 [label="" color="#82DAFF" fillcolor="#C8EDFF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#82DAFF" fillcolor="#C8EDFF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Arrangement and Description {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Arrangement and Description"
+		nest0_0 [label="Environmental Control" color="#82DAFF" fillcolor="#C8EDFF" shape=preparation style=filled]
+		nest0_1 [label="Collection Management Policy" color="#A1D7CD" fillcolor="#EDF5F3" shape=vnode_shape style=filled]
+		nest0_2 [label="Public Access Systems" color="#64B5F6" fillcolor="#E3F2FD" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Subject Indexing for Archives {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Subject Indexing for Archives"
+		nest1_0 [label="Intellectual Property Rights Management" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+		nest1_1 [label="Provenance Tracking" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	}
+	N0 -> N1 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#82DAFF" penwidth=1.5 style=dashed label="retrieves" dir=forward]
+	N4 -> N5 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid label="arranges" dir=forward]
+	N6 -> N7 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N10 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest1_0 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N6 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N9 -> S0 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#A1D7CD" penwidth=1.5 style=solid label="secures" dir=forward]
+	S0 -> N12 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N6 -> S2 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	S2 -> N11 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#82DAFF" penwidth=1.5 style=dashed label="governs" dir=forward]
+	N8 -> M2 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N12 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_292.txt b/test/diagrams/graph_hard/diagrams_292.txt
new file mode 100644
index 0000000000000000000000000000000000000000..99606b7e4ac02174c6fe3a29e4f3c95b89f4bd50
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_292.txt
@@ -0,0 +1,30 @@
+<Acquisition and Accessioning, connectedTo, Community Archiving Projects>
+<Acquisition and Accessioning, connectedTo, Disaster Preparedness for Archives>
+<Acquisition and Accessioning, connectedTo, Security of Holdings>
+<Archival Advocacy, connectedTo, Acquisition and Accessioning>
+<Archival Advocacy, connectedTo, Digitization of Records>
+<Collection Management Policy, connectedTo, Public Access Systems>
+<Community Archiving Projects, connectedTo, Security of Holdings>
+<Digital Asset Management, arranges, Acquisition and Accessioning>
+<Digital Forensics for Archives, connectedTo, Community Archiving Projects>
+<Digital Forensics for Archives, connectedTo, Long_Term Digital Preservation>
+<Digital Forensics for Archives, connectedTo, Security of Holdings>
+<Digital Forensics for Archives, secures, Grant Writing for Archives>
+<Digitization of Records, governs, Security of Holdings>
+<Digitization of Records, retrieves, Preservation Planning>
+<Disaster Preparedness for Archives, connectedTo, Emulation for Obsolete Formats>
+<Disaster Preparedness for Archives, connectedTo, Environmental Control>
+<Disaster Preparedness for Archives, connectedTo, Intellectual Property Rights Management>
+<Emulation for Obsolete Formats, connectedTo, Digital Forensics for Archives>
+<Emulation for Obsolete Formats, connectedTo, Security of Holdings>
+<Environmental Control, connectedTo, Collection Management Policy>
+<Intellectual Property Rights Management, connectedTo, Provenance Tracking>
+<Long_Term Digital Preservation, connectedTo, Community Archiving Projects>
+<Oral History Collection, connectedTo, Web Archiving>
+<Preservation Planning, connectedTo, Digital Asset Management>
+<Preservation Planning, connectedTo, Security of Holdings>
+<Provenance Tracking, connectedTo, Acquisition and Accessioning>
+<Public Access Systems, connectedTo, Long_Term Digital Preservation>
+<Security of Holdings, connectedTo, Grant Writing for Archives>
+<Web Archiving, connectedTo, Acquisition and Accessioning>
+<Web Archiving, connectedTo, Archival Advocacy>
diff --git a/test/diagrams/graph_hard/diagrams_293.dot b/test/diagrams/graph_hard/diagrams_293.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2ea3e26df38abecf53f07a788f8367f0473ca922
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_293.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=LR
+	N0 [label="Digitization of Records" color="#FFCC7A" fillcolor="#FFF6D9" shape=action style=filled]
+	N1 [label="Conservation Treatment" color="#FFE470" fillcolor="#FFFAE0" shape=database style=filled]
+	N2 [label="Disaster Preparedness for Archives" color="#9FA9E1" fillcolor="#D6D9F0" shape=action style=filled]
+	N3 [label="Authority Control for Archival Names" color="#9FA9E1" fillcolor="#D6D9F0" shape=multipledocuments style=filled]
+	N4 [label="Records Transfer Processes" color="#FFCC7A" fillcolor="#FFF6D9" shape=diamond style=filled]
+	N5 [label="Public Access Systems" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N6 [label="Access and Reference Services" color="#9FA9E1" fillcolor="#D6D9F0" shape=rect style=filled]
+	N7 [label="Database Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+	S0 [label="" color="#FFCC7A" fillcolor="#FFF6D9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFE470" fillcolor="#FFFAE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFE470" fillcolor="#FFFAE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Collection Management Policy {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Collection Management Policy"
+		nest0_0 [label="Intellectual Property Rights Management" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest0_1 [label="Long_Term Digital Preservation" color="#FFE470" fillcolor="#FFFAE0" shape=multipledocuments style=filled]
+		nest0_2 [label="Preservation Planning" color="#FFCC7A" fillcolor="#FFF6D9" shape=rect style=filled]
+		nest0_3 [label="Security of Holdings" color="#9FA9E1" fillcolor="#D6D9F0" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Finding Aid Creation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Finding Aid Creation"
+		nest1_0 [label="Legal and Ethical Compliance" color="#9FA9E1" fillcolor="#D6D9F0" shape=action style=filled]
+		nest1_1 [label="Data Migration for Digital Archives" color="#FFCC7A" fillcolor="#FFF6D9" shape=diamond style=filled]
+		nest1_2 [label="Acquisition and Accessioning" color="#9FA9E1" fillcolor="#D6D9F0" shape=predefinedprocess style=filled]
+		nest1_3 [label="Digital Forensics for Archives" color="#9FA9E1" fillcolor="#D6D9F0" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest0_0 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N3 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N6 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S2 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#FFCC7A" penwidth=1.5 style=dashed label="acquires" dir=forward]
+	S2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#000000" penwidth=1.5 style=dashed label="manages" dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	M1 -> N5 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	M2 -> N4 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_293.txt b/test/diagrams/graph_hard/diagrams_293.txt
new file mode 100644
index 0000000000000000000000000000000000000000..614962e978e51b798d2c18b39994b93993a35741
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_293.txt
@@ -0,0 +1,32 @@
+<Access and Reference Services, connectedTo, Database Management>
+<Acquisition and Accessioning, connectedTo, Digital Forensics for Archives>
+<Authority Control for Archival Names, connectedTo, Access and Reference Services>
+<Authority Control for Archival Names, connectedTo, Records Transfer Processes>
+<Conservation Treatment, connectedTo, Access and Reference Services>
+<Conservation Treatment, connectedTo, Disaster Preparedness for Archives>
+<Conservation Treatment, connectedTo, Intellectual Property Rights Management>
+<Conservation Treatment, connectedTo, Public Access Systems>
+<Conservation Treatment, connectedTo, Records Transfer Processes>
+<Data Migration for Digital Archives, connectedTo, Acquisition and Accessioning>
+<Digital Forensics for Archives, connectedTo, Access and Reference Services>
+<Digitization of Records, acquires, Access and Reference Services>
+<Digitization of Records, connectedTo, Authority Control for Archival Names>
+<Digitization of Records, connectedTo, Conservation Treatment>
+<Digitization of Records, connectedTo, Public Access Systems>
+<Digitization of Records, connectedTo, Records Transfer Processes>
+<Digitization of Records, manages, Public Access Systems>
+<Disaster Preparedness for Archives, connectedTo, Access and Reference Services>
+<Disaster Preparedness for Archives, connectedTo, Authority Control for Archival Names>
+<Disaster Preparedness for Archives, connectedTo, Database Management>
+<Disaster Preparedness for Archives, connectedTo, Public Access Systems>
+<Disaster Preparedness for Archives, connectedTo, Records Transfer Processes>
+<Intellectual Property Rights Management, connectedTo, Long_Term Digital Preservation>
+<Legal and Ethical Compliance, connectedTo, Data Migration for Digital Archives>
+<Long_Term Digital Preservation, connectedTo, Preservation Planning>
+<Preservation Planning, connectedTo, Security of Holdings>
+<Public Access Systems, connectedTo, Access and Reference Services>
+<Records Transfer Processes, connectedTo, Access and Reference Services>
+<Records Transfer Processes, connectedTo, Database Management>
+<Records Transfer Processes, connectedTo, Legal and Ethical Compliance>
+<Records Transfer Processes, connectedTo, Public Access Systems>
+<Security of Holdings, connectedTo, Authority Control for Archival Names>
diff --git a/test/diagrams/graph_hard/diagrams_294.dot b/test/diagrams/graph_hard/diagrams_294.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0b0a0dff259e2a2be2fc5a6d1352eed4ca5a3074
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_294.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=RL
+	N0 [label="Acquisition and Accessioning" color="#388E3C" fillcolor="#F1F8E9" shape=document style=filled]
+	N1 [label="Records Transfer Processes" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N2 [label="Authority Control for Archival Names" color="#DCE775" fillcolor="#F9FBE7" shape=database style=filled]
+	N3 [label="Emulation for Obsolete Formats" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N4 [label="Metadata Creation" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N5 [label="Conservation Treatment" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+	N6 [label="Environmental Control" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+	N7 [label="Digital Forensics for Archives" color="#6FE1D5" fillcolor="#C9EFEC" shape=parallelogram style=filled]
+	N8 [label="Web Archiving" color="#6FE1D5" fillcolor="#C9EFEC" shape=vnode_shape style=filled]
+	N9 [label="Community Archiving Projects" color="#DCE775" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N10 [label="Provenance Tracking" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N11 [label="Digitization of Records" color="#DCE775" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	S0 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Grant Writing for Archives {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Grant Writing for Archives"
+		nest0_0 [label="Digital Asset Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=rectangle style=filled]
+		nest0_1 [label="Finding Aid Creation" color="#388E3C" fillcolor="#F1F8E9" shape=document style=filled]
+	}
+	subgraph cluster_Security of Holdings {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Security of Holdings"
+		nest1_0 [label="Appraisal and Selection" color="#6FE1D5" fillcolor="#C9EFEC" shape=action style=filled]
+		nest1_1 [label="Oral History Collection" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+		nest1_2 [label="Archival Advocacy" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+	}
+	N0 -> N1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#DCE775" penwidth=1.5 style=solid label="collects" dir=forward]
+	N10 -> N11 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest0_0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> S1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N6 -> S2 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S2 -> N9 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N8 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	M0 -> N9 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N7 -> M1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	M1 -> N11 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N5 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_294.txt b/test/diagrams/graph_hard/diagrams_294.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3d485aa009f83403debd2ccbf71701638bc6a8f7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_294.txt
@@ -0,0 +1,35 @@
+<Acquisition and Accessioning, connectedTo, Community Archiving Projects>
+<Acquisition and Accessioning, connectedTo, Conservation Treatment>
+<Acquisition and Accessioning, connectedTo, Digitization of Records>
+<Acquisition and Accessioning, connectedTo, Metadata Creation>
+<Acquisition and Accessioning, connectedTo, Records Transfer Processes>
+<Acquisition and Accessioning, connectedTo, Web Archiving>
+<Appraisal and Selection, connectedTo, Oral History Collection>
+<Archival Advocacy, connectedTo, Digital Forensics for Archives>
+<Authority Control for Archival Names, connectedTo, Digitization of Records>
+<Authority Control for Archival Names, connectedTo, Emulation for Obsolete Formats>
+<Community Archiving Projects, collects, Provenance Tracking>
+<Conservation Treatment, connectedTo, Community Archiving Projects>
+<Conservation Treatment, connectedTo, Digitization of Records>
+<Conservation Treatment, connectedTo, Environmental Control>
+<Conservation Treatment, connectedTo, Provenance Tracking>
+<Conservation Treatment, connectedTo, Web Archiving>
+<Digital Asset Management, connectedTo, Finding Aid Creation>
+<Digital Forensics for Archives, connectedTo, Digitization of Records>
+<Digital Forensics for Archives, connectedTo, Web Archiving>
+<Emulation for Obsolete Formats, connectedTo, Conservation Treatment>
+<Emulation for Obsolete Formats, connectedTo, Metadata Creation>
+<Environmental Control, connectedTo, Community Archiving Projects>
+<Environmental Control, connectedTo, Digital Forensics for Archives>
+<Environmental Control, connectedTo, Provenance Tracking>
+<Environmental Control, connectedTo, Web Archiving>
+<Finding Aid Creation, connectedTo, Digital Forensics for Archives>
+<Metadata Creation, connectedTo, Conservation Treatment>
+<Oral History Collection, connectedTo, Archival Advocacy>
+<Provenance Tracking, connectedTo, Digitization of Records>
+<Records Transfer Processes, connectedTo, Authority Control for Archival Names>
+<Records Transfer Processes, connectedTo, Community Archiving Projects>
+<Records Transfer Processes, connectedTo, Conservation Treatment>
+<Web Archiving, connectedTo, Appraisal and Selection>
+<Web Archiving, connectedTo, Community Archiving Projects>
+<Web Archiving, connectedTo, Digital Asset Management>
diff --git a/test/diagrams/graph_hard/diagrams_295.dot b/test/diagrams/graph_hard/diagrams_295.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a98bda8844e393bf0e00bf69c2ef7ef777d8c580
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_295.dot
@@ -0,0 +1,83 @@
+digraph {
+	rankdir=BT
+	N0 [label="Community Engagement Platforms" color="#E0E0E0" fillcolor="#EBEBEB" shape=vnode_shape style=filled]
+	N1 [label="RFID for Object Tracking" color="#E0E0E0" fillcolor="#EBEBEB" shape=predefinedprocess style=filled]
+	N2 [label="Soundscape Design" color="#94C0C0" fillcolor="#CADEDE" shape=preparation style=filled]
+	N3 [label="Predictive Maintenance for Tech" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N4 [label="Virtual Reality Experiences" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+	N5 [label="Database Management" color="#FFDA4E" fillcolor="#FFE88D" shape=inputoutput style=filled]
+	N6 [label="Interactive Kiosks" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+	N7 [label="Research Databases Access" color="#E0E0E0" fillcolor="#EBEBEB" shape=multipledocuments style=filled]
+	N8 [label="Gamification of Museum Experiences" color="#E0E0E0" fillcolor="#EBEBEB" shape=vnode_shape style=filled]
+	N9 [label="Ticketing and Visitor Systems" color="#94C0C0" fillcolor="#CADEDE" shape=action style=filled]
+	N10 [label="Member Management Systems" color="#E0E0E0" fillcolor="#EBEBEB" shape=parallelogram style=filled]
+	N11 [label="Digital Signage" color="#FFDA4E" fillcolor="#FFE88D" shape=preparation style=filled]
+	N12 [label="Digital Storytelling" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+	N13 [label="Wayfinding Systems" color="#94C0C0" fillcolor="#CADEDE" shape=multipledocuments style=filled]
+	N14 [label="Cybersecurity for Museum Data" color="#94C0C0" fillcolor="#CADEDE" shape=rect style=filled]
+	N15 [label="Crowdsourcing for Collections" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+	N16 [label="Conservation Technology" color="#FFDA4E" fillcolor="#FFE88D" shape=rectangle style=filled]
+	S0 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#94C0C0" fillcolor="#CADEDE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#E0E0E0" fillcolor="#EBEBEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Digital Archiving {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Digital Archiving"
+		nest0_0 [label="Educational Technology Integration" color="#94C0C0" fillcolor="#CADEDE" shape=vnode_shape style=filled]
+		nest0_1 [label="Augmented Reality Experiences" color="#94C0C0" fillcolor="#CADEDE" shape=inputoutput style=filled]
+		nest0_2 [label="Visitor Flow Analysis" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+		nest0_3 [label="Collection Digitization" color="#E0E0E0" fillcolor="#EBEBEB" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Security Systems Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Security Systems Integration"
+		nest1_0 [label="User Experience Design" color="#E0E0E0" fillcolor="#EBEBEB" shape=rect style=filled]
+		nest1_1 [label="Visitor Analytics" color="#E0E0E0" fillcolor="#EBEBEB" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#94C0C0" penwidth=1.5 style=dashed label="personalizes" dir=forward]
+	N3 -> N4 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed label="tracks" dir=forward]
+	N5 -> N6 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FFDA4E" penwidth=1.5 style=dashed label="analyzes" dir=forward]
+	N10 -> N11 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed label="maintains" dir=forward]
+	nest0_3 -> N12 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N8 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N12 -> S0 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N16 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N15 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#FFDA4E" penwidth=1.5 style=solid label="exhibits" dir=forward]
+	N10 -> M0 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M0 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N11 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N14 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	N13 -> M1 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N16 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_296.dot b/test/diagrams/graph_hard/diagrams_296.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2618f4aed5feadf0f62e9bf0b6d3cc94c6ce68b7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_296.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=RL
+	N0 [label="Exhibition Design" color="#E91E63" fillcolor="#F8BBD0" shape=rect style=filled]
+	N1 [label="Digital Storytelling" color="#FFD54F" fillcolor="#FFF8E1" shape=action style=filled]
+	N2 [label="Member Management Systems" color="#FFD54F" fillcolor="#FFF8E1" shape=predefinedprocess style=filled]
+	N3 [label="Robotics in Exhibits" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N4 [label="Research Databases Access" color="#E91E63" fillcolor="#F8BBD0" shape=rect style=filled]
+	N5 [label="Community Engagement Platforms" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N6 [label="Visitor Analytics" color="#FFD54F" fillcolor="#FFF8E1" shape=predefinedprocess style=filled]
+	N7 [label="Augmented Reality Experiences" color="#F06292" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N8 [label="Accessibility Technology for Visitors" color="#FFD54F" fillcolor="#FFF8E1" shape=inputoutput style=filled]
+	N9 [label="User Experience Design" color="#E91E63" fillcolor="#F8BBD0" shape=rectangle style=filled]
+	N10 [label="Virtual Reality Experiences" color="#E91E63" fillcolor="#F8BBD0" shape=document style=filled]
+	N11 [label="Gamification of Museum Experiences" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N12 [label="3D Scanning of Artifacts" color="#F06292" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	S0 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#F8BBD0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#E91E63" fillcolor="#F8BBD0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Digital Preservation Strategies {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Digital Preservation Strategies"
+		nest0_0 [label="Interactive Display Development" color="#E91E63" fillcolor="#F8BBD0" shape=database style=filled]
+		nest0_1 [label="Educational Technology Integration" color="#F06292" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+		nest0_2 [label="Virtual Tours" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+	}
+	subgraph cluster_Fundraising Technology {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Fundraising Technology"
+		nest1_0 [label="Cybersecurity for Museum Data" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+		nest1_1 [label="Wayfinding Systems" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+		nest1_2 [label="Environmental Control Systems" color="#FFD54F" fillcolor="#FFF8E1" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> nest0_0 [color="#FFD54F" penwidth=1.5 style=dashed label="renders" dir=forward]
+	nest0_2 -> N12 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest1_0 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N6 [color="#E91E63" penwidth=1.5 style=solid label="guides" dir=forward]
+	N8 -> S0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#FFD54F" penwidth=1.5 style=dashed label="upgrades" dir=forward]
+	N3 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M1 [color="#000000" penwidth=1.5 style=solid label="restores" dir=forward]
+	N1 -> M1 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_296.txt b/test/diagrams/graph_hard/diagrams_296.txt
new file mode 100644
index 0000000000000000000000000000000000000000..54af4f7a6cfa5cc11583d66f929de9fb5d40687f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_296.txt
@@ -0,0 +1,30 @@
+<Accessibility Technology for Visitors, connectedTo, 3D Scanning of Artifacts>
+<Accessibility Technology for Visitors, connectedTo, Gamification of Museum Experiences>
+<Accessibility Technology for Visitors, connectedTo, User Experience Design>
+<Augmented Reality Experiences, connectedTo, Accessibility Technology for Visitors>
+<Community Engagement Platforms, connectedTo, Cybersecurity for Museum Data>
+<Community Engagement Platforms, connectedTo, Visitor Analytics>
+<Cybersecurity for Museum Data, connectedTo, Wayfinding Systems>
+<Digital Storytelling, connectedTo, Gamification of Museum Experiences>
+<Digital Storytelling, connectedTo, Member Management Systems>
+<Educational Technology Integration, connectedTo, Virtual Tours>
+<Environmental Control Systems, guides, Visitor Analytics>
+<Exhibition Design, connectedTo, Digital Storytelling>
+<Exhibition Design, connectedTo, Gamification of Museum Experiences>
+<Gamification of Museum Experiences, connectedTo, 3D Scanning of Artifacts>
+<Gamification of Museum Experiences, renders, Interactive Display Development>
+<Interactive Display Development, connectedTo, Educational Technology Integration>
+<Member Management Systems, connectedTo, Robotics in Exhibits>
+<Research Databases Access, connectedTo, Community Engagement Platforms>
+<Research Databases Access, connectedTo, Visitor Analytics>
+<Research Databases Access, upgrades, Accessibility Technology for Visitors>
+<Robotics in Exhibits, connectedTo, Augmented Reality Experiences>
+<Robotics in Exhibits, connectedTo, Research Databases Access>
+<Robotics in Exhibits, connectedTo, Virtual Reality Experiences>
+<Robotics in Exhibits, connectedTo, Visitor Analytics>
+<User Experience Design, connectedTo, Virtual Reality Experiences>
+<User Experience Design, restores, Gamification of Museum Experiences>
+<Virtual Reality Experiences, connectedTo, Gamification of Museum Experiences>
+<Virtual Tours, connectedTo, 3D Scanning of Artifacts>
+<Visitor Analytics, connectedTo, Augmented Reality Experiences>
+<Wayfinding Systems, connectedTo, Environmental Control Systems>
diff --git a/test/diagrams/graph_hard/diagrams_298.dot b/test/diagrams/graph_hard/diagrams_298.dot
new file mode 100644
index 0000000000000000000000000000000000000000..57f4ed31f1c4431ac18e728ba23637216e001c99
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_298.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=LR
+	N0 [label="Data Privacy Compliance" color="#4CAF50" fillcolor="#C8E6C9" shape=diamond style=filled]
+	N1 [label="Monitoring and Enforcement" color="#CD8FF2" fillcolor="#ECCFF5" shape=action style=filled]
+	N2 [label="Anti_Bribery and Corruption Compliance" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N3 [label="Ethical AI Guidelines" color="#CD8FF2" fillcolor="#ECCFF5" shape=document style=filled]
+	N4 [label="Conflict of Interest Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=preparation style=filled]
+	N5 [label="Product Safety Compliance" color="#CB9BE1" fillcolor="#F2E6F5" shape=multipledocuments style=filled]
+	N6 [label="Sanctions Compliance" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N7 [label="Internal Investigations" color="#4CAF50" fillcolor="#C8E6C9" shape=predefinedprocess style=filled]
+	N8 [label="Risk Assessment" color="#CB9BE1" fillcolor="#F2E6F5" shape=diamond style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Anti_Money Laundering Compliance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Anti_Money Laundering Compliance"
+		nest0_0 [label="Ethical Leadership Development" color="#CB9BE1" fillcolor="#F2E6F5" shape=multipledocuments style=filled]
+		nest0_1 [label="Compliance Training" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Compliance Software Implementation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Compliance Software Implementation"
+		nest1_0 [label="Compliance Hotlines" color="#4CAF50" fillcolor="#C8E6C9" shape=rect style=filled]
+		nest1_1 [label="Code of Conduct Implementation" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+		nest1_2 [label="Legal Advisory" color="#CB9BE1" fillcolor="#F2E6F5" shape=database style=filled]
+		nest1_3 [label="Ethics Committee Formation" color="#CD8FF2" fillcolor="#ECCFF5" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N3 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S2 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N5 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N7 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N3 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N7 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_298.txt b/test/diagrams/graph_hard/diagrams_298.txt
new file mode 100644
index 0000000000000000000000000000000000000000..58b3b6cf53fdeee8fcce9c9b977be8cf532fc8c0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_298.txt
@@ -0,0 +1,26 @@
+<Anti_Bribery and Corruption Compliance, connectedTo, Conflict of Interest Management>
+<Anti_Bribery and Corruption Compliance, connectedTo, Ethical AI Guidelines>
+<Anti_Bribery and Corruption Compliance, connectedTo, Internal Investigations>
+<Anti_Bribery and Corruption Compliance, connectedTo, Product Safety Compliance>
+<Anti_Bribery and Corruption Compliance, connectedTo, Risk Assessment>
+<Code of Conduct Implementation, connectedTo, Legal Advisory>
+<Compliance Hotlines, connectedTo, Code of Conduct Implementation>
+<Compliance Training, connectedTo, Ethical AI Guidelines>
+<Conflict of Interest Management, connectedTo, Compliance Hotlines>
+<Conflict of Interest Management, connectedTo, Product Safety Compliance>
+<Data Privacy Compliance, connectedTo, Ethical AI Guidelines>
+<Data Privacy Compliance, connectedTo, Monitoring and Enforcement>
+<Ethical AI Guidelines, connectedTo, Conflict of Interest Management>
+<Ethical AI Guidelines, connectedTo, Ethical Leadership Development>
+<Ethical AI Guidelines, connectedTo, Internal Investigations>
+<Ethical AI Guidelines, connectedTo, Product Safety Compliance>
+<Ethical Leadership Development, connectedTo, Compliance Training>
+<Ethics Committee Formation, connectedTo, Ethical AI Guidelines>
+<Internal Investigations, connectedTo, Risk Assessment>
+<Legal Advisory, connectedTo, Ethics Committee Formation>
+<Monitoring and Enforcement, connectedTo, Anti_Bribery and Corruption Compliance>
+<Monitoring and Enforcement, connectedTo, Ethical AI Guidelines>
+<Monitoring and Enforcement, connectedTo, Internal Investigations>
+<Product Safety Compliance, connectedTo, Internal Investigations>
+<Product Safety Compliance, connectedTo, Sanctions Compliance>
+<Sanctions Compliance, connectedTo, Internal Investigations>
diff --git a/test/diagrams/graph_hard/diagrams_299.dot b/test/diagrams/graph_hard/diagrams_299.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c7c77301e7314b9abb8d8b8c6212858bc35be377
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_299.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=RL
+	N0 [label="Ethical AI Guidelines" color="#FFC107" fillcolor="#FFECB3" shape=database style=filled]
+	N1 [label="Audit Planning" color="#5C6BC0" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	N2 [label="Data Ethics" color="#FFC107" fillcolor="#FFECB3" shape=multipledocuments style=filled]
+	N3 [label="Ethical Decision_Making Frameworks" color="#5C6BC0" fillcolor="#E8EAF6" shape=inputoutput style=filled]
+	N4 [label="Policy Development" color="#4CAF50" fillcolor="#C8E6C9" shape=vnode_shape style=filled]
+	N5 [label="Sanctions Compliance" color="#4CAF50" fillcolor="#C8E6C9" shape=rectangle style=filled]
+	N6 [label="Anti_Bribery and Corruption Compliance" color="#4CAF50" fillcolor="#C8E6C9" shape=inputoutput style=filled]
+	N7 [label="Bias Mitigation" color="#4CAF50" fillcolor="#C8E6C9" shape=preparation style=filled]
+	N8 [label="Monitoring and Enforcement" color="#4CAF50" fillcolor="#C8E6C9" shape=diamond style=filled]
+	N9 [label="Risk Assessment" color="#4CAF50" fillcolor="#C8E6C9" shape=inputoutput style=filled]
+	N10 [label="Information Security Compliance" color="#FFC107" fillcolor="#FFECB3" shape=rectangle style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFC107" fillcolor="#FFECB3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Export Control Compliance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Export Control Compliance"
+		nest0_0 [label="Compliance Training" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+		nest0_1 [label="Consumer Protection Compliance" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+		nest0_2 [label="Ethical Leadership Development" color="#FFC107" fillcolor="#FFECB3" shape=database style=filled]
+		nest0_3 [label="Fair Competition Compliance" color="#5C6BC0" fillcolor="#E8EAF6" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Compliance Hotlines {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Compliance Hotlines"
+		nest1_0 [label="Healthcare Compliance" color="#FFC107" fillcolor="#FFECB3" shape=diamond style=filled]
+		nest1_1 [label="Legal Advisory" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+		nest1_2 [label="Data Privacy Compliance" color="#FFC107" fillcolor="#FFECB3" shape=database style=filled]
+		nest1_3 [label="Code of Conduct Implementation" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#4CAF50" penwidth=1.5 style=solid label="accountability" dir=forward]
+	nest0_0 -> nest0_1 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest1_0 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N10 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N0 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#FFC107" penwidth=1.5 style=solid label="enforces" dir=forward]
+	N6 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N1 -> S2 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_3 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_299.txt b/test/diagrams/graph_hard/diagrams_299.txt
new file mode 100644
index 0000000000000000000000000000000000000000..732cb0bc9d480ffd50cda7423984f64be9430d2e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_299.txt
@@ -0,0 +1,28 @@
+<Anti_Bribery and Corruption Compliance, connectedTo, Bias Mitigation>
+<Anti_Bribery and Corruption Compliance, connectedTo, Information Security Compliance>
+<Anti_Bribery and Corruption Compliance, connectedTo, Risk Assessment>
+<Audit Planning, connectedTo, Bias Mitigation>
+<Audit Planning, connectedTo, Data Ethics>
+<Audit Planning, connectedTo, Sanctions Compliance>
+<Bias Mitigation, connectedTo, Compliance Training>
+<Bias Mitigation, connectedTo, Monitoring and Enforcement>
+<Code of Conduct Implementation, connectedTo, Information Security Compliance>
+<Compliance Training, connectedTo, Consumer Protection Compliance>
+<Consumer Protection Compliance, connectedTo, Ethical Leadership Development>
+<Consumer Protection Compliance, connectedTo, Fair Competition Compliance>
+<Data Ethics, connectedTo, Ethical Decision_Making Frameworks>
+<Data Privacy Compliance, connectedTo, Code of Conduct Implementation>
+<Ethical AI Guidelines, connectedTo, Audit Planning>
+<Ethical AI Guidelines, connectedTo, Information Security Compliance>
+<Ethical AI Guidelines, connectedTo, Monitoring and Enforcement>
+<Ethical AI Guidelines, enforces, Sanctions Compliance>
+<Ethical Decision_Making Frameworks, connectedTo, Policy Development>
+<Ethical Leadership Development, connectedTo, Fair Competition Compliance>
+<Fair Competition Compliance, connectedTo, Sanctions Compliance>
+<Healthcare Compliance, connectedTo, Legal Advisory>
+<Legal Advisory, connectedTo, Data Privacy Compliance>
+<Monitoring and Enforcement, connectedTo, Risk Assessment>
+<Policy Development, connectedTo, Sanctions Compliance>
+<Risk Assessment, accountability, Information Security Compliance>
+<Risk Assessment, connectedTo, Healthcare Compliance>
+<Sanctions Compliance, connectedTo, Anti_Bribery and Corruption Compliance>
diff --git a/test/diagrams/graph_hard/diagrams_3.dot b/test/diagrams/graph_hard/diagrams_3.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9f039dc5e548c3cd0ae23ad44de5618b7ee6ed47
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_3.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=LR
+	N0 [label="Venture Capital Funding" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N1 [label="Customer Onboarding" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N2 [label="Asset Management" color="#90A4AE" fillcolor="#ECEFF1" shape=inputoutput style=filled]
+	N3 [label="Payment Gateway Integration" color="#AED581" fillcolor="#F0F4C3" shape=multipledocuments style=filled]
+	N4 [label="Securities Trading" color="#8C9EFF" fillcolor="#D3D7EB" shape=document style=filled]
+	N5 [label="Loan Processing" color="#8C9EFF" fillcolor="#D3D7EB" shape=diamond style=filled]
+	N6 [label="Account Verification" color="#90A4AE" fillcolor="#ECEFF1" shape=rectangle style=filled]
+	N7 [label="Budgeting Analysis" color="#90A4AE" fillcolor="#ECEFF1" shape=document style=filled]
+	N8 [label="Fraud Check" color="#90A4AE" fillcolor="#ECEFF1" shape=document style=filled]
+	N9 [label="Forex Trading" color="#90A4AE" fillcolor="#ECEFF1" shape=rect style=filled]
+	N10 [label="Portfolio Management" color="#90A4AE" fillcolor="#ECEFF1" shape=inputoutput style=filled]
+	N11 [label="Mortgage Application" color="#AED581" fillcolor="#F0F4C3" shape=rectangle style=filled]
+	N12 [label="Wealth Management" color="#90A4AE" fillcolor="#ECEFF1" shape=rectangle style=filled]
+	N13 [label="Income Verification" color="#AED581" fillcolor="#F0F4C3" shape=inputoutput style=filled]
+	S0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_IPO Launch {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="IPO Launch"
+		nest0_0 [label="Financial Advisory" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+		nest0_1 [label="Underwriting" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest0_2 [label="Transaction Logging" color="#AED581" fillcolor="#F0F4C3" shape=preparation style=filled]
+	}
+	subgraph cluster_Dispute Resolution {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Dispute Resolution"
+		nest1_0 [label="Transaction Audit" color="#AED581" fillcolor="#F0F4C3" shape=vnode_shape style=filled]
+		nest1_1 [label="Fund Disbursement" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#90A4AE" penwidth=1.5 style=dashed label="checks" dir=forward]
+	N1 -> N2 [color="#90A4AE" penwidth=1.5 style=dashed label="settles" dir=forward]
+	N2 -> N3 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#AED581" penwidth=1.5 style=dashed label="executes" dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest0_0 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest1_0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N12 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S2 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	S2 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M1 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N11 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#AED581" penwidth=1.5 style=solid label="underwrites" dir=forward]
+	M1 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_3.txt b/test/diagrams/graph_hard/diagrams_3.txt
new file mode 100644
index 0000000000000000000000000000000000000000..33f0632608728f8cec680e6f20931ed09272c6c5
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_3.txt
@@ -0,0 +1,29 @@
+<Account Verification, connectedTo, Budgeting Analysis>
+<Asset Management, connectedTo, Payment Gateway Integration>
+<Budgeting Analysis, connectedTo, Forex Trading>
+<Budgeting Analysis, connectedTo, Fraud Check>
+<Budgeting Analysis, connectedTo, Portfolio Management>
+<Customer Onboarding, settles, Asset Management>
+<Customer Onboarding, underwrites, Income Verification>
+<Financial Advisory, connectedTo, Underwriting>
+<Forex Trading, connectedTo, Income Verification>
+<Forex Trading, connectedTo, Portfolio Management>
+<Fraud Check, executes, Forex Trading>
+<Fund Disbursement, connectedTo, Wealth Management>
+<Loan Processing, connectedTo, Account Verification>
+<Loan Processing, connectedTo, Transaction Audit>
+<Mortgage Application, connectedTo, Income Verification>
+<Mortgage Application, connectedTo, Wealth Management>
+<Payment Gateway Integration, connectedTo, Account Verification>
+<Payment Gateway Integration, connectedTo, Forex Trading>
+<Payment Gateway Integration, connectedTo, Securities Trading>
+<Portfolio Management, connectedTo, Mortgage Application>
+<Securities Trading, connectedTo, Account Verification>
+<Securities Trading, connectedTo, Budgeting Analysis>
+<Securities Trading, connectedTo, Financial Advisory>
+<Securities Trading, connectedTo, Loan Processing>
+<Transaction Audit, connectedTo, Fund Disbursement>
+<Transaction Logging, connectedTo, Forex Trading>
+<Underwriting, connectedTo, Transaction Logging>
+<Venture Capital Funding, checks, Customer Onboarding>
+<Wealth Management, connectedTo, Income Verification>
diff --git a/test/diagrams/graph_hard/diagrams_30.dot b/test/diagrams/graph_hard/diagrams_30.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5da7eed00c7ef1c2c508127edf2d10a3721d85b8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_30.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=LR
+	N0 [label="Contract Termination" color="#6EB76D" fillcolor="#E9F7E8" shape=action style=filled]
+	N1 [label="Technical Support Escalation" color="#81C784" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N2 [label="Bill Generation" color="#BDBDBD" fillcolor="#F5F5F5" shape=rectangle style=filled]
+	N3 [label="Speed Throttling" color="#81C784" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N4 [label="Antenna Maintenance" color="#BDBDBD" fillcolor="#F5F5F5" shape=action style=filled]
+	N5 [label="MMS Transmission" color="#6EB76D" fillcolor="#E9F7E8" shape=predefinedprocess style=filled]
+	N6 [label="Spectrum Management" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N7 [label="Bandwidth Allocation" color="#6EB76D" fillcolor="#E9F7E8" shape=multipledocuments style=filled]
+	N8 [label="Usage Monitoring" color="#81C784" fillcolor="#F1F8E9" shape=rectangle style=filled]
+	N9 [label="Service Complaint" color="#6EB76D" fillcolor="#E9F7E8" shape=vnode_shape style=filled]
+	N10 [label="Customer Relationship Management" color="#BDBDBD" fillcolor="#F5F5F5" shape=diamond style=filled]
+	N11 [label="Fiber Optic Deployment" color="#BDBDBD" fillcolor="#F5F5F5" shape=vnode_shape style=filled]
+	N12 [label="Plan Renewal" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N13 [label="SIM Registration" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N14 [label="Customer Support" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N15 [label="Outage Detection" color="#6EB76D" fillcolor="#E9F7E8" shape=vnode_shape style=filled]
+	N16 [label="Plan Selection" color="#BDBDBD" fillcolor="#F5F5F5" shape=parallelogram style=filled]
+	S0 [label="" color="#BDBDBD" fillcolor="#F5F5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#BDBDBD" fillcolor="#F5F5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_IoT Device Connection {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="IoT Device Connection"
+		nest0_0 [label="Call Recording" color="#81C784" fillcolor="#F1F8E9" shape=rectangle style=filled]
+		nest0_1 [label="Base Station Installation" color="#81C784" fillcolor="#F1F8E9" shape=rectangle style=filled]
+	}
+	subgraph cluster_SMS Delivery {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="SMS Delivery"
+		nest1_0 [label="Service Level Agreement" color="#6EB76D" fillcolor="#E9F7E8" shape=vnode_shape style=filled]
+		nest1_1 [label="Fraudulent Call Blocking" color="#BDBDBD" fillcolor="#F5F5F5" shape=diamond style=filled]
+		nest1_2 [label="VoIP Service" color="#BDBDBD" fillcolor="#F5F5F5" shape=diamond style=filled]
+		nest1_3 [label="Number Porting" color="#6EB76D" fillcolor="#E9F7E8" shape=document style=filled]
+	}
+	N0 -> N1 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#BDBDBD" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#BDBDBD" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#BDBDBD" penwidth=1.5 style=solid label="analyzes" dir=forward]
+	N5 -> N6 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=solid label="troubleshoots" dir=forward]
+	nest0_0 -> nest0_1 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest0_0 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N8 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#6EB76D" penwidth=1.5 style=solid label="alerts" dir=forward]
+	nest1_1 -> nest1_2 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest1_0 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N13 [color="#BDBDBD" penwidth=1.5 style=dashed label="notifies" dir=forward]
+	N11 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N16 [color="#BDBDBD" penwidth=1.5 style=dashed label="generates" dir=forward]
+	S0 -> N14 [color="#6EB76D" penwidth=1.5 style=dashed label="controls" dir=forward]
+	S0 -> N13 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	M0 -> N11 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M1 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N15 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_30.txt b/test/diagrams/graph_hard/diagrams_30.txt
new file mode 100644
index 0000000000000000000000000000000000000000..79813f0f255a596243c60431ffebd27d07881437
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_30.txt
@@ -0,0 +1,32 @@
+<Antenna Maintenance, analyzes, MMS Transmission>
+<Antenna Maintenance, connectedTo, Call Recording>
+<Antenna Maintenance, connectedTo, Fiber Optic Deployment>
+<Antenna Maintenance, connectedTo, Outage Detection>
+<Bandwidth Allocation, connectedTo, Usage Monitoring>
+<Base Station Installation, connectedTo, Usage Monitoring>
+<Bill Generation, connectedTo, Fiber Optic Deployment>
+<Bill Generation, connectedTo, Speed Throttling>
+<Call Recording, connectedTo, Base Station Installation>
+<Contract Termination, connectedTo, Technical Support Escalation>
+<Customer Relationship Management, connectedTo, Fiber Optic Deployment>
+<Customer Support, connectedTo, Outage Detection>
+<Fiber Optic Deployment, connectedTo, Plan Renewal>
+<Fiber Optic Deployment, connectedTo, SIM Registration>
+<Fiber Optic Deployment, controls, Customer Support>
+<Fiber Optic Deployment, generates, Plan Selection>
+<Fraudulent Call Blocking, connectedTo, VoIP Service>
+<MMS Transmission, connectedTo, Spectrum Management>
+<Number Porting, notifies, SIM Registration>
+<Outage Detection, troubleshoots, Plan Selection>
+<Plan Renewal, connectedTo, SIM Registration>
+<Plan Renewal, connectedTo, Service Level Agreement>
+<SIM Registration, connectedTo, Customer Support>
+<Service Complaint, connectedTo, Customer Relationship Management>
+<Service Complaint, connectedTo, Outage Detection>
+<Service Level Agreement, alerts, Fraudulent Call Blocking>
+<Spectrum Management, connectedTo, Bandwidth Allocation>
+<Speed Throttling, connectedTo, Antenna Maintenance>
+<Speed Throttling, connectedTo, Fiber Optic Deployment>
+<Technical Support Escalation, connectedTo, Bill Generation>
+<Usage Monitoring, connectedTo, Service Complaint>
+<VoIP Service, connectedTo, Number Porting>
diff --git a/test/diagrams/graph_hard/diagrams_300.dot b/test/diagrams/graph_hard/diagrams_300.dot
new file mode 100644
index 0000000000000000000000000000000000000000..aa709258338c6217116acd7a83616f7acc09a0b6
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_300.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=TB
+	N0 [label="Ethics Committee Formation" color="#9575CD" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N1 [label="Product Safety Compliance" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N2 [label="Ethical Decision_Making Frameworks" color="#7E57C2" fillcolor="#EDE7F6" shape=rect style=filled]
+	N3 [label="Healthcare Compliance" color="#66BB6A" fillcolor="#E8F5E9" shape=rectangle style=filled]
+	N4 [label="Anti_Money Laundering Compliance" color="#66BB6A" fillcolor="#E8F5E9" shape=diamond style=filled]
+	N5 [label="Sanctions Compliance" color="#9575CD" fillcolor="#EDE7F6" shape=multipledocuments style=filled]
+	N6 [label="Transparent Communication" color="#9575CD" fillcolor="#EDE7F6" shape=action style=filled]
+	N7 [label="Export Control Compliance" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N8 [label="Monitoring and Enforcement" color="#66BB6A" fillcolor="#E8F5E9" shape=database style=filled]
+	N9 [label="Consumer Protection Compliance" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N10 [label="Compliance Training" color="#66BB6A" fillcolor="#E8F5E9" shape=rect style=filled]
+	N11 [label="CSR Reporting" color="#66BB6A" fillcolor="#E8F5E9" shape=preparation style=filled]
+	N12 [label="Risk Assessment" color="#9575CD" fillcolor="#EDE7F6" shape=multipledocuments style=filled]
+	N13 [label="Ethical Leadership Development" color="#66BB6A" fillcolor="#E8F5E9" shape=predefinedprocess style=filled]
+	S0 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Information Security Compliance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Information Security Compliance"
+		nest0_0 [label="Third_Party Due Diligence" color="#9575CD" fillcolor="#EDE7F6" shape=inputoutput style=filled]
+		nest0_1 [label="Supplier Code of Conduct" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	}
+	subgraph cluster_Regulatory Interpretation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Regulatory Interpretation"
+		nest1_0 [label="Conflict of Interest Management" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+		nest1_1 [label="Fair Competition Compliance" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_2 [label="Ethical AI Guidelines" color="#9575CD" fillcolor="#EDE7F6" shape=document style=filled]
+		nest1_3 [label="Labor Law Compliance" color="#9575CD" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#7E57C2" penwidth=1.5 style=solid label="certifies" dir=forward]
+	N7 -> N8 [color="#7E57C2" penwidth=1.5 style=dashed label="trains" dir=forward]
+	N8 -> N9 [color="#7E57C2" penwidth=1.5 style=solid label="accountability" dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest0_0 [color="#9575CD" penwidth=1.5 style=solid label="guides" dir=forward]
+	nest0_1 -> N5 [color="#7E57C2" penwidth=1.5 style=dashed label="counsels" dir=forward]
+	nest1_0 -> nest1_1 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest1_0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N13 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#66BB6A" penwidth=1.5 style=dashed label="establishes" dir=forward]
+	N0 -> S1 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	S1 -> N2 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S2 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_300.txt b/test/diagrams/graph_hard/diagrams_300.txt
new file mode 100644
index 0000000000000000000000000000000000000000..88504a5e0574d7357da057d6482a30042ad806b3
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_300.txt
@@ -0,0 +1,31 @@
+<Anti_Money Laundering Compliance, connectedTo, Sanctions Compliance>
+<CSR Reporting, connectedTo, Risk Assessment>
+<Compliance Training, connectedTo, CSR Reporting>
+<Compliance Training, guides, Third_Party Due Diligence>
+<Conflict of Interest Management, connectedTo, Fair Competition Compliance>
+<Consumer Protection Compliance, connectedTo, Compliance Training>
+<Ethical AI Guidelines, connectedTo, Labor Law Compliance>
+<Ethical Decision_Making Frameworks, connectedTo, Healthcare Compliance>
+<Ethics Committee Formation, connectedTo, Anti_Money Laundering Compliance>
+<Ethics Committee Formation, connectedTo, CSR Reporting>
+<Ethics Committee Formation, connectedTo, Ethical Decision_Making Frameworks>
+<Ethics Committee Formation, connectedTo, Product Safety Compliance>
+<Export Control Compliance, trains, Monitoring and Enforcement>
+<Fair Competition Compliance, connectedTo, Ethical AI Guidelines>
+<Healthcare Compliance, connectedTo, Anti_Money Laundering Compliance>
+<Healthcare Compliance, connectedTo, Transparent Communication>
+<Healthcare Compliance, establishes, Monitoring and Enforcement>
+<Labor Law Compliance, connectedTo, Ethical Leadership Development>
+<Monitoring and Enforcement, accountability, Consumer Protection Compliance>
+<Monitoring and Enforcement, connectedTo, Conflict of Interest Management>
+<Product Safety Compliance, connectedTo, Anti_Money Laundering Compliance>
+<Product Safety Compliance, connectedTo, CSR Reporting>
+<Product Safety Compliance, connectedTo, Compliance Training>
+<Product Safety Compliance, connectedTo, Ethical Decision_Making Frameworks>
+<Risk Assessment, connectedTo, Ethical Leadership Development>
+<Sanctions Compliance, connectedTo, Consumer Protection Compliance>
+<Sanctions Compliance, connectedTo, Transparent Communication>
+<Supplier Code of Conduct, counsels, Sanctions Compliance>
+<Third_Party Due Diligence, connectedTo, Supplier Code of Conduct>
+<Transparent Communication, certifies, Export Control Compliance>
+<Transparent Communication, connectedTo, Consumer Protection Compliance>
diff --git a/test/diagrams/graph_hard/diagrams_301.dot b/test/diagrams/graph_hard/diagrams_301.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8d2c6458abda937ce779cbbd207c8f06869b978e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_301.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=TB
+	N0 [label="Data Recovery" color="#CD8FF2" fillcolor="#ECCFF5" shape=document style=filled]
+	N1 [label="Forensic Psychology" color="#FFA726" fillcolor="#FFF3E0" shape=rectangle style=filled]
+	N2 [label="Expert Witness Testimony" color="#CD8FF2" fillcolor="#ECCFF5" shape=vnode_shape style=filled]
+	N3 [label="Toxicology Testing" color="#2196F3" fillcolor="#BBDEFB" shape=inputoutput style=filled]
+	N4 [label="Handwriting Analysis" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N5 [label="Forensic Photography" color="#FFA726" fillcolor="#FFF3E0" shape=database style=filled]
+	N6 [label="Voice Recognition" color="#CD8FF2" fillcolor="#ECCFF5" shape=rect style=filled]
+	N7 [label="Forensic Botany" color="#2196F3" fillcolor="#BBDEFB" shape=document style=filled]
+	N8 [label="Chain of Custody Management" color="#2196F3" fillcolor="#BBDEFB" shape=action style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Evidence Preservation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Evidence Preservation"
+		nest0_0 [label="Forensic Entomology" color="#FFA726" fillcolor="#FFF3E0" shape=action style=filled]
+		nest0_1 [label="Cold Case Review" color="#CD8FF2" fillcolor="#ECCFF5" shape=database style=filled]
+		nest0_2 [label="Courtroom Presentation" color="#CD8FF2" fillcolor="#ECCFF5" shape=vnode_shape style=filled]
+		nest0_3 [label="Document Examination" color="#2196F3" fillcolor="#BBDEFB" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Digital Forensics {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Digital Forensics"
+		nest1_0 [label="Toolmark Analysis" color="#2196F3" fillcolor="#BBDEFB" shape=inputoutput style=filled]
+		nest1_1 [label="Fingerprint Analysis" color="#FFA726" fillcolor="#FFF3E0" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N2 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N8 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N4 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S1 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=solid label="researches" dir=forward]
+	S1 -> N7 [color="#FFA726" penwidth=1.5 style=dashed label="examines" dir=forward]
+	S1 -> N6 [color="#000000" penwidth=1.5 style=solid label="autopsies" dir=forward]
+	N0 -> M0 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid label="investigates" dir=forward]
+	N2 -> M1 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	M1 -> N5 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_302.dot b/test/diagrams/graph_hard/diagrams_302.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cda798fb7d776bc11efda8c843a83725cc79dbc1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_302.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=BT
+	N0 [label="Crime Scene Investigation" color="#FFF9AE" fillcolor="#FFFCE6" shape=document style=filled]
+	N1 [label="Forensic Odontology" color="#FFF9AE" fillcolor="#FFFCE6" shape=action style=filled]
+	N2 [label="Document Examination" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N3 [label="Voice Recognition" color="#A2D0FF" fillcolor="#E8F0FF" shape=action style=filled]
+	N4 [label="Handwriting Analysis" color="#A2D0FF" fillcolor="#E8F0FF" shape=inputoutput style=filled]
+	N5 [label="Expert Witness Testimony" color="#FFF9AE" fillcolor="#FFFCE6" shape=preparation style=filled]
+	N6 [label="Forensic Interviewing" color="#5C6BC0" fillcolor="#E8EAF6" shape=predefinedprocess style=filled]
+	N7 [label="Legal Standards Compliance" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N8 [label="Laboratory Analysis" color="#FFF9AE" fillcolor="#FFFCE6" shape=parallelogram style=filled]
+	N9 [label="Bloodstain Pattern Analysis" color="#FFF9AE" fillcolor="#FFFCE6" shape=document style=filled]
+	N10 [label="Crime Database Search" color="#A2D0FF" fillcolor="#E8F0FF" shape=diamond style=filled]
+	N11 [label="Courtroom Presentation" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N12 [label="Forensic Pathology" color="#5C6BC0" fillcolor="#E8EAF6" shape=rect style=filled]
+	N13 [label="Cold Case Review" color="#A2D0FF" fillcolor="#E8F0FF" shape=preparation style=filled]
+	N14 [label="Polygraph Examination" color="#FFF9AE" fillcolor="#FFFCE6" shape=rect style=filled]
+	N15 [label="Facial Recognition" color="#FFF9AE" fillcolor="#FFFCE6" shape=action style=filled]
+	S0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A2D0FF" fillcolor="#E8F0FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A2D0FF" fillcolor="#E8F0FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Evidence Collection {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Evidence Collection"
+		nest0_0 [label="Cyber Crime Investigation" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+		nest0_1 [label="Evidence Preservation" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+		nest0_2 [label="Toolmark Analysis" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	}
+	subgraph cluster_Arson Investigation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Arson Investigation"
+		nest1_0 [label="Mobile Device Forensics" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+		nest1_1 [label="Forensic Psychology" color="#FFF9AE" fillcolor="#FFFCE6" shape=rect style=filled]
+		nest1_2 [label="Cloud Forensics" color="#5C6BC0" fillcolor="#E8EAF6" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed label="educates" dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest0_0 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N2 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#5C6BC0" penwidth=1.5 style=solid label="analyzes" dir=forward]
+	nest1_1 -> nest1_2 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N2 [color="#FFF9AE" penwidth=1.5 style=solid label="tests" dir=forward]
+	N11 -> S0 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N10 -> S2 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N15 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N13 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	S2 -> N12 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_302.txt b/test/diagrams/graph_hard/diagrams_302.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7151979cbc052788e3f2f9f7826d346f0aaf3898
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_302.txt
@@ -0,0 +1,37 @@
+<Bloodstain Pattern Analysis, connectedTo, Crime Database Search>
+<Bloodstain Pattern Analysis, connectedTo, Mobile Device Forensics>
+<Cloud Forensics, tests, Document Examination>
+<Cold Case Review, connectedTo, Polygraph Examination>
+<Courtroom Presentation, connectedTo, Cold Case Review>
+<Courtroom Presentation, connectedTo, Facial Recognition>
+<Courtroom Presentation, connectedTo, Polygraph Examination>
+<Courtroom Presentation, educates, Forensic Pathology>
+<Crime Database Search, connectedTo, Cold Case Review>
+<Crime Database Search, connectedTo, Courtroom Presentation>
+<Crime Database Search, connectedTo, Facial Recognition>
+<Crime Database Search, connectedTo, Forensic Pathology>
+<Crime Scene Investigation, connectedTo, Forensic Odontology>
+<Cyber Crime Investigation, connectedTo, Evidence Preservation>
+<Document Examination, connectedTo, Voice Recognition>
+<Evidence Preservation, connectedTo, Toolmark Analysis>
+<Expert Witness Testimony, connectedTo, Bloodstain Pattern Analysis>
+<Expert Witness Testimony, connectedTo, Forensic Interviewing>
+<Forensic Interviewing, connectedTo, Courtroom Presentation>
+<Forensic Interviewing, connectedTo, Forensic Pathology>
+<Forensic Interviewing, connectedTo, Laboratory Analysis>
+<Forensic Interviewing, connectedTo, Legal Standards Compliance>
+<Forensic Interviewing, connectedTo, Polygraph Examination>
+<Forensic Odontology, connectedTo, Courtroom Presentation>
+<Forensic Odontology, connectedTo, Document Examination>
+<Forensic Pathology, connectedTo, Cold Case Review>
+<Forensic Psychology, connectedTo, Cloud Forensics>
+<Handwriting Analysis, connectedTo, Expert Witness Testimony>
+<Laboratory Analysis, connectedTo, Bloodstain Pattern Analysis>
+<Legal Standards Compliance, connectedTo, Bloodstain Pattern Analysis>
+<Legal Standards Compliance, connectedTo, Cyber Crime Investigation>
+<Legal Standards Compliance, connectedTo, Laboratory Analysis>
+<Mobile Device Forensics, analyzes, Forensic Psychology>
+<Polygraph Examination, connectedTo, Facial Recognition>
+<Toolmark Analysis, connectedTo, Document Examination>
+<Voice Recognition, connectedTo, Bloodstain Pattern Analysis>
+<Voice Recognition, connectedTo, Handwriting Analysis>
diff --git a/test/diagrams/graph_hard/diagrams_303.dot b/test/diagrams/graph_hard/diagrams_303.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1c3b8bc8c2afb0bd2748deda9643ecaf4badd3fc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_303.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=BT
+	N0 [label="Network Forensics" color="#FF8A65" fillcolor="#FBE9E7" shape=database style=filled]
+	N1 [label="Digital Forensics" color="#FF8A65" fillcolor="#FBE9E7" shape=multipledocuments style=filled]
+	N2 [label="Laboratory Analysis" color="#F7BEE0" fillcolor="#FAEBF3" shape=document style=filled]
+	N3 [label="Expert Witness Testimony" color="#FF8A65" fillcolor="#FBE9E7" shape=vnode_shape style=filled]
+	N4 [label="Fingerprint Analysis" color="#FF8A65" fillcolor="#FBE9E7" shape=predefinedprocess style=filled]
+	N5 [label="Crime Database Search" color="#F7BEE0" fillcolor="#FAEBF3" shape=rectangle style=filled]
+	N6 [label="Document Examination" color="#FFC085" fillcolor="#FFDAB9" shape=predefinedprocess style=filled]
+	N7 [label="Chain of Custody Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=inputoutput style=filled]
+	N8 [label="Forensic Botany" color="#FFC085" fillcolor="#FFDAB9" shape=hexagon style=filled]
+	N9 [label="Malware Analysis" color="#FF8A65" fillcolor="#FBE9E7" shape=document style=filled]
+	N10 [label="Cyber Crime Investigation" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N11 [label="Legal Standards Compliance" color="#F7BEE0" fillcolor="#FAEBF3" shape=diamond style=filled]
+	N12 [label="Forensic Entomology" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	S0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FF8A65" fillcolor="#FBE9E7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Data Recovery {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Data Recovery"
+		nest0_0 [label="Forensic Psychology" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+		nest0_1 [label="Toxicology Testing" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+		nest0_2 [label="Vehicle Forensics" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest0_3 [label="Arson Investigation" color="#F7BEE0" fillcolor="#FAEBF3" shape=database style=filled]
+	}
+	subgraph cluster_DNA Profiling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="DNA Profiling"
+		nest1_0 [label="Bloodstain Pattern Analysis" color="#FF8A65" fillcolor="#FBE9E7" shape=document style=filled]
+		nest1_1 [label="Ballistics Analysis" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+		nest1_2 [label="Forensic Accounting" color="#FFC085" fillcolor="#FFDAB9" shape=inputoutput style=filled]
+		nest1_3 [label="Mobile Device Forensics" color="#FF8A65" fillcolor="#FBE9E7" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest0_0 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N2 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S0 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S1 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	M1 -> N3 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N6 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_304.dot b/test/diagrams/graph_hard/diagrams_304.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cdcd23698873e13b3741ee8575d3ed4145689e9f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_304.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=BT
+	N0 [label="Vulnerability Assessment" color="#E57373" fillcolor="#FFEBEE" shape=rect style=filled]
+	N1 [label="Data Analytics for Terrorism" color="#388E3C" fillcolor="#C8E6C9" shape=vnode_shape style=filled]
+	N2 [label="Emergency Preparedness" color="#E57373" fillcolor="#FFEBEE" shape=inputoutput style=filled]
+	N3 [label="Biometric Screening" color="#388E3C" fillcolor="#C8E6C9" shape=vnode_shape style=filled]
+	N4 [label="Information Sharing" color="#8C9EFF" fillcolor="#D3D7EB" shape=predefinedprocess style=filled]
+	N5 [label="Military Counterterrorism" color="#8C9EFF" fillcolor="#D3D7EB" shape=database style=filled]
+	N6 [label="Risk Analysis" color="#388E3C" fillcolor="#C8E6C9" shape=action style=filled]
+	N7 [label="Radicalization Prevention" color="#388E3C" fillcolor="#C8E6C9" shape=vnode_shape style=filled]
+	N8 [label="Threat Assessment" color="#388E3C" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N9 [label="Hostage Negotiation" color="#E57373" fillcolor="#FFEBEE" shape=diamond style=filled]
+	N10 [label="Airport Security" color="#388E3C" fillcolor="#C8E6C9" shape=action style=filled]
+	S0 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Critical Infrastructure Protection {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Critical Infrastructure Protection"
+		nest0_0 [label="Chemical Biological Radiological Nuclear Defense" color="#388E3C" fillcolor="#C8E6C9" shape=hexagon style=filled]
+		nest0_1 [label="Public Awareness Campaigns" color="#E57373" fillcolor="#FFEBEE" shape=action style=filled]
+		nest0_2 [label="International Cooperation" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	}
+	subgraph cluster_Fusion Center Operations {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Fusion Center Operations"
+		nest1_0 [label="Terrorism Financing Interdiction" color="#388E3C" fillcolor="#C8E6C9" shape=rectangle style=filled]
+		nest1_1 [label="Transportation Security" color="#8C9EFF" fillcolor="#D3D7EB" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N5 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest1_0 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N8 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S0 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N0 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M0 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N9 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N5 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_304.txt b/test/diagrams/graph_hard/diagrams_304.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4015c9e5c6e0c2c98e453adfadb250515c130e25
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_304.txt
@@ -0,0 +1,28 @@
+<Biometric Screening, connectedTo, Hostage Negotiation>
+<Biometric Screening, connectedTo, Information Sharing>
+<Chemical Biological Radiological Nuclear Defense, connectedTo, Public Awareness Campaigns>
+<Data Analytics for Terrorism, connectedTo, Emergency Preparedness>
+<Data Analytics for Terrorism, connectedTo, Military Counterterrorism>
+<Emergency Preparedness, connectedTo, Biometric Screening>
+<Emergency Preparedness, connectedTo, Military Counterterrorism>
+<Hostage Negotiation, connectedTo, Airport Security>
+<Information Sharing, connectedTo, Military Counterterrorism>
+<International Cooperation, connectedTo, Military Counterterrorism>
+<Military Counterterrorism, connectedTo, Airport Security>
+<Military Counterterrorism, connectedTo, Chemical Biological Radiological Nuclear Defense>
+<Military Counterterrorism, connectedTo, Hostage Negotiation>
+<Military Counterterrorism, connectedTo, Risk Analysis>
+<Public Awareness Campaigns, connectedTo, International Cooperation>
+<Radicalization Prevention, connectedTo, Hostage Negotiation>
+<Radicalization Prevention, connectedTo, Threat Assessment>
+<Risk Analysis, connectedTo, Hostage Negotiation>
+<Risk Analysis, connectedTo, Radicalization Prevention>
+<Risk Analysis, connectedTo, Terrorism Financing Interdiction>
+<Terrorism Financing Interdiction, connectedTo, Transportation Security>
+<Threat Assessment, connectedTo, Hostage Negotiation>
+<Transportation Security, connectedTo, Threat Assessment>
+<Vulnerability Assessment, connectedTo, Data Analytics for Terrorism>
+<Vulnerability Assessment, connectedTo, Information Sharing>
+<Vulnerability Assessment, connectedTo, Military Counterterrorism>
+<Vulnerability Assessment, connectedTo, Risk Analysis>
+<Vulnerability Assessment, connectedTo, Threat Assessment>
diff --git a/test/diagrams/graph_hard/diagrams_305.dot b/test/diagrams/graph_hard/diagrams_305.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0d1a99ccbd93a8f33492c25294edfff0cdaa963f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_305.dot
@@ -0,0 +1,58 @@
+digraph {
+	rankdir=RL
+	N0 [label="Radicalization Prevention" color="#3F51B5" fillcolor="#C5CAE9" shape=rectangle style=filled]
+	N1 [label="Surveillance and Monitoring" color="#3F51B5" fillcolor="#C5CAE9" shape=diamond style=filled]
+	N2 [label="Terrorism Financing Interdiction" color="#CDDC39" fillcolor="#E6EE9C" shape=predefinedprocess style=filled]
+	N3 [label="Counter_Propaganda" color="#CDDC39" fillcolor="#E6EE9C" shape=action style=filled]
+	N4 [label="Threat Assessment" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+	N5 [label="Forensic Investigation of Attacks" color="#CDDC39" fillcolor="#E6EE9C" shape=predefinedprocess style=filled]
+	N6 [label="Legislation and Policy Development" color="#9FA9E1" fillcolor="#D6D9F0" shape=action style=filled]
+	N7 [label="Psychological Operations" color="#3F51B5" fillcolor="#C5CAE9" shape=multipledocuments style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Fusion Center Operations {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Fusion Center Operations"
+		nest0_0 [label="Intelligence Analysis" color="#9FA9E1" fillcolor="#D6D9F0" shape=rect style=filled]
+		nest0_1 [label="Information Sharing" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+		nest0_2 [label="Insider Threat Programs" color="#3F51B5" fillcolor="#C5CAE9" shape=diamond style=filled]
+	}
+	subgraph cluster_Military Counterterrorism {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Military Counterterrorism"
+		nest1_0 [label="Target Hardening" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+		nest1_1 [label="Port Security" color="#CDDC39" fillcolor="#E6EE9C" shape=preparation style=filled]
+		nest1_2 [label="Cybersecurity Defense" color="#CDDC39" fillcolor="#E6EE9C" shape=document style=filled]
+		nest1_3 [label="Drone Countermeasures" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed label="international_cooperates" dir=forward]
+	nest0_2 -> N1 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N6 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N2 -> S0 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N4 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N3 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#3F51B5" penwidth=1.5 style=dashed label="risk_assesses" dir=forward]
+	N4 -> S2 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_305.txt b/test/diagrams/graph_hard/diagrams_305.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b6555bb8457484179064e052e02bfe3d04844de0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_305.txt
@@ -0,0 +1,24 @@
+<Counter_Propaganda, connectedTo, Threat Assessment>
+<Cybersecurity Defense, connectedTo, Drone Countermeasures>
+<Drone Countermeasures, connectedTo, Legislation and Policy Development>
+<Forensic Investigation of Attacks, connectedTo, Legislation and Policy Development>
+<Information Sharing, connectedTo, Insider Threat Programs>
+<Insider Threat Programs, connectedTo, Surveillance and Monitoring>
+<Intelligence Analysis, connectedTo, Information Sharing>
+<Legislation and Policy Development, connectedTo, Psychological Operations>
+<Legislation and Policy Development, international_cooperates, Intelligence Analysis>
+<Port Security, connectedTo, Cybersecurity Defense>
+<Radicalization Prevention, connectedTo, Surveillance and Monitoring>
+<Surveillance and Monitoring, connectedTo, Counter_Propaganda>
+<Surveillance and Monitoring, connectedTo, Legislation and Policy Development>
+<Surveillance and Monitoring, connectedTo, Terrorism Financing Interdiction>
+<Surveillance and Monitoring, risk_assesses, Psychological Operations>
+<Target Hardening, connectedTo, Port Security>
+<Terrorism Financing Interdiction, connectedTo, Counter_Propaganda>
+<Terrorism Financing Interdiction, connectedTo, Forensic Investigation of Attacks>
+<Terrorism Financing Interdiction, connectedTo, Psychological Operations>
+<Terrorism Financing Interdiction, connectedTo, Threat Assessment>
+<Threat Assessment, connectedTo, Forensic Investigation of Attacks>
+<Threat Assessment, connectedTo, Legislation and Policy Development>
+<Threat Assessment, connectedTo, Psychological Operations>
+<Threat Assessment, connectedTo, Target Hardening>
diff --git a/test/diagrams/graph_hard/diagrams_306.dot b/test/diagrams/graph_hard/diagrams_306.dot
new file mode 100644
index 0000000000000000000000000000000000000000..06e478984ac3a77458d271010824072c615712a2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_306.dot
@@ -0,0 +1,91 @@
+digraph {
+	rankdir=RL
+	N0 [label="Data Analytics for Terrorism" color="#FFF9AE" fillcolor="#FFFCE6" shape=predefinedprocess style=filled]
+	N1 [label="International Cooperation" color="#82DAFF" fillcolor="#C8EDFF" shape=document style=filled]
+	N2 [label="Fusion Center Operations" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N3 [label="Risk_Based Security Measures" color="#FFF9AE" fillcolor="#FFFCE6" shape=rectangle style=filled]
+	N4 [label="Post_Incident Recovery" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N5 [label="Military Counterterrorism" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+	N6 [label="Port Security" color="#82DAFF" fillcolor="#C8EDFF" shape=multipledocuments style=filled]
+	N7 [label="Risk Analysis" color="#FFF9AE" fillcolor="#FFFCE6" shape=preparation style=filled]
+	N8 [label="Surveillance and Monitoring" color="#82DAFF" fillcolor="#C8EDFF" shape=inputoutput style=filled]
+	N9 [label="Bomb Disposal" color="#FFF9AE" fillcolor="#FFFCE6" shape=vnode_shape style=filled]
+	N10 [label="Information Sharing" color="#82DAFF" fillcolor="#C8EDFF" shape=document style=filled]
+	N11 [label="Intelligence Gathering" color="#FFF9AE" fillcolor="#FFFCE6" shape=inputoutput style=filled]
+	N12 [label="Cybersecurity Defense" color="#82DAFF" fillcolor="#C8EDFF" shape=diamond style=filled]
+	N13 [label="Airport Security" color="#82DAFF" fillcolor="#C8EDFF" shape=document style=filled]
+	N14 [label="Counter_Propaganda" color="#82DAFF" fillcolor="#C8EDFF" shape=parallelogram style=filled]
+	N15 [label="Biometric Screening" color="#FFF9AE" fillcolor="#FFFCE6" shape=action style=filled]
+	S0 [label="" color="#82DAFF" fillcolor="#C8EDFF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#82DAFF" fillcolor="#C8EDFF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Homeland Security Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Homeland Security Planning"
+		nest0_0 [label="Public Awareness Campaigns" color="#FFF9AE" fillcolor="#FFFCE6" shape=predefinedprocess style=filled]
+		nest0_1 [label="Psychological Operations" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+		nest0_2 [label="Critical Infrastructure Protection" color="#82DAFF" fillcolor="#C8EDFF" shape=parallelogram style=filled]
+		nest0_3 [label="Vulnerability Assessment" color="#82DAFF" fillcolor="#C8EDFF" shape=database style=filled]
+	}
+	subgraph cluster_Threat Assessment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Threat Assessment"
+		nest1_0 [label="Forensic Investigation of Attacks" color="#FFEB3B" fillcolor="#FFF9C4" shape=rect style=filled]
+		nest1_1 [label="Early Warning Systems" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+		nest1_2 [label="Terrorism Financing Interdiction" color="#82DAFF" fillcolor="#C8EDFF" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed label="rescues_hostages" dir=forward]
+	N6 -> N7 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#82DAFF" penwidth=1.5 style=dashed label="public_informs" dir=forward]
+	N12 -> N13 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N9 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#82DAFF" penwidth=1.5 style=dashed label="alerts" dir=forward]
+	N5 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed label="technologies_applies" dir=forward]
+	nest1_2 -> N3 [color="#000000" penwidth=1.5 style=solid label="laws_enforces" dir=forward]
+	N1 -> S0 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#FFF9AE" penwidth=1.5 style=solid label="mitigates" dir=forward]
+	S0 -> N15 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S1 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N2 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S2 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#82DAFF" penwidth=1.5 style=dashed label="shares_info" dir=forward]
+	S2 -> N15 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	S2 -> N2 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	M0 -> N7 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N4 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N6 -> M2 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	M2 -> N8 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_306.txt b/test/diagrams/graph_hard/diagrams_306.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7c4802d68065c177d793b0cb7139538a82c5ff4f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_306.txt
@@ -0,0 +1,40 @@
+<Airport Security, connectedTo, Counter_Propaganda>
+<Bomb Disposal, connectedTo, Information Sharing>
+<Counter_Propaganda, connectedTo, Biometric Screening>
+<Critical Infrastructure Protection, connectedTo, Vulnerability Assessment>
+<Cybersecurity Defense, connectedTo, Airport Security>
+<Data Analytics for Terrorism, connectedTo, Biometric Screening>
+<Data Analytics for Terrorism, connectedTo, Cybersecurity Defense>
+<Data Analytics for Terrorism, connectedTo, Fusion Center Operations>
+<Data Analytics for Terrorism, connectedTo, Information Sharing>
+<Data Analytics for Terrorism, connectedTo, International Cooperation>
+<Data Analytics for Terrorism, connectedTo, Post_Incident Recovery>
+<Data Analytics for Terrorism, shares_info, Bomb Disposal>
+<Early Warning Systems, alerts, Terrorism Financing Interdiction>
+<Forensic Investigation of Attacks, connectedTo, Early Warning Systems>
+<Fusion Center Operations, connectedTo, Post_Incident Recovery>
+<Fusion Center Operations, connectedTo, Public Awareness Campaigns>
+<Fusion Center Operations, connectedTo, Risk Analysis>
+<Fusion Center Operations, connectedTo, Risk_Based Security Measures>
+<Information Sharing, connectedTo, Intelligence Gathering>
+<Intelligence Gathering, public_informs, Cybersecurity Defense>
+<International Cooperation, connectedTo, Biometric Screening>
+<International Cooperation, connectedTo, Counter_Propaganda>
+<International Cooperation, connectedTo, Fusion Center Operations>
+<International Cooperation, connectedTo, Post_Incident Recovery>
+<International Cooperation, connectedTo, Surveillance and Monitoring>
+<International Cooperation, mitigates, Surveillance and Monitoring>
+<Military Counterterrorism, connectedTo, Risk Analysis>
+<Military Counterterrorism, rescues_hostages, Port Security>
+<Military Counterterrorism, technologies_applies, Forensic Investigation of Attacks>
+<Port Security, connectedTo, Risk Analysis>
+<Port Security, connectedTo, Surveillance and Monitoring>
+<Post_Incident Recovery, connectedTo, Military Counterterrorism>
+<Post_Incident Recovery, connectedTo, Risk Analysis>
+<Psychological Operations, connectedTo, Critical Infrastructure Protection>
+<Public Awareness Campaigns, connectedTo, Psychological Operations>
+<Risk Analysis, connectedTo, Surveillance and Monitoring>
+<Risk_Based Security Measures, connectedTo, Post_Incident Recovery>
+<Surveillance and Monitoring, connectedTo, Bomb Disposal>
+<Terrorism Financing Interdiction, laws_enforces, Risk_Based Security Measures>
+<Vulnerability Assessment, connectedTo, Bomb Disposal>
diff --git a/test/diagrams/graph_hard/diagrams_307.dot b/test/diagrams/graph_hard/diagrams_307.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5172f5d1adc7b28e21fef4a6c18ea89df141f4e9
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_307.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=LR
+	N0 [label="Real_time Alerts" color="#AF56A6" fillcolor="#DDCEDD" shape=action style=filled]
+	N1 [label="Wildlife Tracking" color="#AF56A6" fillcolor="#DDCEDD" shape=parallelogram style=filled]
+	N2 [label="Facial Recognition Systems" color="#AF56A6" fillcolor="#DDCEDD" shape=action style=filled]
+	N3 [label="Mobile Phone Interception" color="#73C6BC" fillcolor="#D0EFEE" shape=diamond style=filled]
+	N4 [label="Asset Tracking" color="#AF56A6" fillcolor="#DDCEDD" shape=parallelogram style=filled]
+	N5 [label="Biometric Data Analysis" color="#AF56A6" fillcolor="#DDCEDD" shape=database style=filled]
+	N6 [label="Network Monitoring" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N7 [label="Border Surveillance" color="#A188D0" fillcolor="#DACBE3" shape=action style=filled]
+	N8 [label="Drone Surveillance" color="#73C6BC" fillcolor="#D0EFEE" shape=parallelogram style=filled]
+	N9 [label="Internet Traffic Monitoring" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+	N10 [label="Sensor Network Deployment" color="#A188D0" fillcolor="#DACBE3" shape=inputoutput style=filled]
+	N11 [label="Anomaly Detection" color="#73C6BC" fillcolor="#D0EFEE" shape=parallelogram style=filled]
+	S0 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Data Storage and Retention {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Data Storage and Retention"
+		nest0_0 [label="Predictive Policing" color="#73C6BC" fillcolor="#D0EFEE" shape=document style=filled]
+		nest0_1 [label="Night Vision Technology" color="#A188D0" fillcolor="#DACBE3" shape=multipledocuments style=filled]
+		nest0_2 [label="CCTV Monitoring" color="#73C6BC" fillcolor="#D0EFEE" shape=rectangle style=filled]
+		nest0_3 [label="Intrusion Detection" color="#AF56A6" fillcolor="#DDCEDD" shape=document style=filled]
+	}
+	subgraph cluster_Security Personnel Operations {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Security Personnel Operations"
+		nest1_0 [label="Cyber Surveillance" color="#73C6BC" fillcolor="#D0EFEE" shape=rectangle style=filled]
+		nest1_1 [label="Physical Security Integration" color="#A188D0" fillcolor="#DACBE3" shape=inputoutput style=filled]
+		nest1_2 [label="Satellite Imaging" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed label="observes" dir=forward]
+	N3 -> N4 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest1_0 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S0 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N11 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#AF56A6" penwidth=1.5 style=solid label="evidence_gathers" dir=forward]
+	M1 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M2 -> N3 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_307.txt b/test/diagrams/graph_hard/diagrams_307.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bc57684da45f26690a22bca8a2aed13aeef8d3a1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_307.txt
@@ -0,0 +1,35 @@
+<Asset Tracking, connectedTo, Biometric Data Analysis>
+<Biometric Data Analysis, connectedTo, Border Surveillance>
+<Biometric Data Analysis, connectedTo, Drone Surveillance>
+<Biometric Data Analysis, connectedTo, Internet Traffic Monitoring>
+<Biometric Data Analysis, connectedTo, Network Monitoring>
+<Biometric Data Analysis, connectedTo, Sensor Network Deployment>
+<Border Surveillance, connectedTo, Drone Surveillance>
+<Border Surveillance, connectedTo, Predictive Policing>
+<CCTV Monitoring, connectedTo, Intrusion Detection>
+<Cyber Surveillance, connectedTo, Physical Security Integration>
+<Drone Surveillance, connectedTo, Cyber Surveillance>
+<Drone Surveillance, connectedTo, Internet Traffic Monitoring>
+<Facial Recognition Systems, observes, Mobile Phone Interception>
+<Internet Traffic Monitoring, connectedTo, Sensor Network Deployment>
+<Intrusion Detection, connectedTo, Internet Traffic Monitoring>
+<Mobile Phone Interception, connectedTo, Anomaly Detection>
+<Mobile Phone Interception, connectedTo, Asset Tracking>
+<Mobile Phone Interception, connectedTo, Drone Surveillance>
+<Mobile Phone Interception, connectedTo, Internet Traffic Monitoring>
+<Mobile Phone Interception, connectedTo, Network Monitoring>
+<Network Monitoring, connectedTo, Anomaly Detection>
+<Network Monitoring, connectedTo, Border Surveillance>
+<Network Monitoring, connectedTo, Internet Traffic Monitoring>
+<Network Monitoring, connectedTo, Sensor Network Deployment>
+<Network Monitoring, evidence_gathers, Drone Surveillance>
+<Night Vision Technology, connectedTo, CCTV Monitoring>
+<Physical Security Integration, connectedTo, Satellite Imaging>
+<Predictive Policing, connectedTo, Night Vision Technology>
+<Real_time Alerts, connectedTo, Anomaly Detection>
+<Real_time Alerts, connectedTo, Mobile Phone Interception>
+<Real_time Alerts, connectedTo, Wildlife Tracking>
+<Satellite Imaging, connectedTo, Sensor Network Deployment>
+<Sensor Network Deployment, connectedTo, Anomaly Detection>
+<Wildlife Tracking, connectedTo, Facial Recognition Systems>
+<Wildlife Tracking, connectedTo, Mobile Phone Interception>
diff --git a/test/diagrams/graph_hard/diagrams_308.dot b/test/diagrams/graph_hard/diagrams_308.dot
new file mode 100644
index 0000000000000000000000000000000000000000..af2ce5eac5a0993d5c05fbaed1c86fa44ae69333
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_308.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=RL
+	N0 [label="Remote Sensing" color="#DCE775" fillcolor="#FCFCE7" shape=preparation style=filled]
+	N1 [label="Satellite Imaging" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N2 [label="Anomaly Detection" color="#DCE775" fillcolor="#FCFCE7" shape=multipledocuments style=filled]
+	N3 [label="Video Analytics" color="#FFC107" fillcolor="#FFECB3" shape=preparation style=filled]
+	N4 [label="Real_time Alerts" color="#FFC107" fillcolor="#FFECB3" shape=rectangle style=filled]
+	N5 [label="Industrial Surveillance" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N6 [label="Traffic Surveillance" color="#DCE775" fillcolor="#FCFCE7" shape=vnode_shape style=filled]
+	N7 [label="Predictive Policing" color="#388E3C" fillcolor="#F1F8E9" shape=document style=filled]
+	N8 [label="GPS Tracking" color="#FFC107" fillcolor="#FFECB3" shape=inputoutput style=filled]
+	N9 [label="Intrusion Detection" color="#FFC107" fillcolor="#FFECB3" shape=preparation style=filled]
+	N10 [label="Network Monitoring" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N11 [label="Data Collection" color="#DCE775" fillcolor="#FCFCE7" shape=inputoutput style=filled]
+	N12 [label="Mobile Phone Interception" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N13 [label="Audio Surveillance" color="#DCE775" fillcolor="#FCFCE7" shape=predefinedprocess style=filled]
+	N14 [label="Facial Recognition Systems" color="#FFC107" fillcolor="#FFECB3" shape=multipledocuments style=filled]
+	N15 [label="Border Surveillance" color="#388E3C" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N16 [label="Biometric Data Analysis" color="#DCE775" fillcolor="#FCFCE7" shape=rect style=filled]
+	N17 [label="Sensor Network Deployment" color="#388E3C" fillcolor="#F1F8E9" shape=rect style=filled]
+	N18 [label="Legal Compliance" color="#FFC107" fillcolor="#FFECB3" shape=inputoutput style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFC107" fillcolor="#FFECB3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#DCE775" fillcolor="#FCFCE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFC107" fillcolor="#FFECB3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Internet Traffic Monitoring {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Internet Traffic Monitoring"
+		nest0_0 [label="Thermal Imaging" color="#DCE775" fillcolor="#FCFCE7" shape=rectangle style=filled]
+		nest0_1 [label="Security Personnel Operations" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest0_2 [label="Physical Security Integration" color="#388E3C" fillcolor="#F1F8E9" shape=rectangle style=filled]
+		nest0_3 [label="Pattern Recognition" color="#FFC107" fillcolor="#FFECB3" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Night Vision Technology {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Night Vision Technology"
+		nest1_0 [label="Asset Tracking" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+		nest1_1 [label="Access Control Systems" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+		nest1_2 [label="CCTV Monitoring" color="#DCE775" fillcolor="#FCFCE7" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N17 -> N18 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> S0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N18 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> S1 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	S1 -> N18 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S1 -> N17 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=solid label="protects" dir=forward]
+	N2 -> M0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	M0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N11 -> M1 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M1 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	M1 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_308.txt b/test/diagrams/graph_hard/diagrams_308.txt
new file mode 100644
index 0000000000000000000000000000000000000000..07f0077f76213298150fbde0e07b8ff4b944dfd7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_308.txt
@@ -0,0 +1,39 @@
+<Access Control Systems, connectedTo, CCTV Monitoring>
+<Anomaly Detection, connectedTo, Industrial Surveillance>
+<Anomaly Detection, connectedTo, Legal Compliance>
+<Anomaly Detection, connectedTo, Predictive Policing>
+<Anomaly Detection, connectedTo, Video Analytics>
+<Asset Tracking, connectedTo, Access Control Systems>
+<Audio Surveillance, connectedTo, Biometric Data Analysis>
+<Audio Surveillance, connectedTo, Border Surveillance>
+<Audio Surveillance, connectedTo, Facial Recognition Systems>
+<Audio Surveillance, connectedTo, Legal Compliance>
+<Audio Surveillance, connectedTo, Sensor Network Deployment>
+<Biometric Data Analysis, connectedTo, Sensor Network Deployment>
+<Border Surveillance, connectedTo, Biometric Data Analysis>
+<CCTV Monitoring, connectedTo, Video Analytics>
+<Data Collection, connectedTo, Border Surveillance>
+<Data Collection, connectedTo, Mobile Phone Interception>
+<Facial Recognition Systems, connectedTo, Border Surveillance>
+<GPS Tracking, connectedTo, Asset Tracking>
+<GPS Tracking, connectedTo, Border Surveillance>
+<GPS Tracking, connectedTo, Intrusion Detection>
+<Industrial Surveillance, connectedTo, Border Surveillance>
+<Industrial Surveillance, connectedTo, Traffic Surveillance>
+<Intrusion Detection, connectedTo, Network Monitoring>
+<Mobile Phone Interception, connectedTo, Audio Surveillance>
+<Network Monitoring, connectedTo, Data Collection>
+<Pattern Recognition, connectedTo, Anomaly Detection>
+<Physical Security Integration, connectedTo, Pattern Recognition>
+<Predictive Policing, connectedTo, GPS Tracking>
+<Real_time Alerts, connectedTo, Industrial Surveillance>
+<Remote Sensing, connectedTo, Satellite Imaging>
+<Satellite Imaging, connectedTo, Anomaly Detection>
+<Satellite Imaging, connectedTo, Border Surveillance>
+<Security Personnel Operations, connectedTo, Physical Security Integration>
+<Sensor Network Deployment, connectedTo, Legal Compliance>
+<Thermal Imaging, connectedTo, Security Personnel Operations>
+<Traffic Surveillance, connectedTo, Predictive Policing>
+<Traffic Surveillance, connectedTo, Thermal Imaging>
+<Video Analytics, connectedTo, Real_time Alerts>
+<Video Analytics, protects, Predictive Policing>
diff --git a/test/diagrams/graph_hard/diagrams_309.dot b/test/diagrams/graph_hard/diagrams_309.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e176f30dccf0f8b96d90d4789ef038a826fa6b1a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_309.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=BT
+	N0 [label="Night Vision Technology" color="#E57373" fillcolor="#FFEBEE" shape=parallelogram style=filled]
+	N1 [label="Drone Surveillance" color="#A1D7CD" fillcolor="#EDF5F3" shape=predefinedprocess style=filled]
+	N2 [label="Video Analytics" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	N3 [label="Industrial Surveillance" color="#A188DB" fillcolor="#DED7F0" shape=action style=filled]
+	N4 [label="Environmental Monitoring" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N5 [label="Pattern Recognition" color="#E57373" fillcolor="#FFEBEE" shape=database style=filled]
+	N6 [label="Network Monitoring" color="#E57373" fillcolor="#FFEBEE" shape=document style=filled]
+	N7 [label="Traffic Surveillance" color="#E57373" fillcolor="#FFEBEE" shape=database style=filled]
+	N8 [label="Privacy Concerns Mitigation" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N9 [label="Physical Security Integration" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N10 [label="Facial Recognition Systems" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N11 [label="Wildlife Tracking" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N12 [label="Data Collection" color="#E57373" fillcolor="#FFEBEE" shape=action style=filled]
+	N13 [label="Border Surveillance" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N14 [label="GPS Tracking" color="#E57373" fillcolor="#FFEBEE" shape=predefinedprocess style=filled]
+	N15 [label="Thermal Imaging" color="#A1D7CD" fillcolor="#EDF5F3" shape=preparation style=filled]
+	N16 [label="Automated Threat Detection" color="#E57373" fillcolor="#FFEBEE" shape=preparation style=filled]
+	N17 [label="Security Personnel Operations" color="#A188DB" fillcolor="#DED7F0" shape=rect style=filled]
+	N18 [label="Remote Sensing" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N19 [label="Real_time Alerts" color="#A188DB" fillcolor="#DED7F0" shape=inputoutput style=filled]
+	S0 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Access Control Systems {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Access Control Systems"
+		nest0_0 [label="Predictive Policing" color="#A1D7CD" fillcolor="#EDF5F3" shape=parallelogram style=filled]
+		nest0_1 [label="CCTV Monitoring" color="#E57373" fillcolor="#FFEBEE" shape=database style=filled]
+	}
+	subgraph cluster_Asset Tracking {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Asset Tracking"
+		nest1_0 [label="Satellite Imaging" color="#A188DB" fillcolor="#DED7F0" shape=rectangle style=filled]
+		nest1_1 [label="Anomaly Detection" color="#A1D7CD" fillcolor="#EDF5F3" shape=parallelogram style=filled]
+		nest1_2 [label="Public Space Monitoring" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	}
+	N0 -> N1 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#A188DB" penwidth=1.5 style=solid label="authenticates" dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#000000" penwidth=1.5 style=solid label="visualizes" dir=forward]
+	N17 -> N18 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N18 -> N19 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N14 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed label="tracks" dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=dashed label="privacy_protects" dir=forward]
+	N9 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N15 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_309.txt b/test/diagrams/graph_hard/diagrams_309.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cafcd59757f8202e771d142072f143682a08a8d1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_309.txt
@@ -0,0 +1,35 @@
+<Anomaly Detection, connectedTo, Public Space Monitoring>
+<Automated Threat Detection, visualizes, Security Personnel Operations>
+<Border Surveillance, connectedTo, GPS Tracking>
+<CCTV Monitoring, connectedTo, GPS Tracking>
+<Data Collection, connectedTo, Border Surveillance>
+<Drone Surveillance, connectedTo, Border Surveillance>
+<Drone Surveillance, connectedTo, Pattern Recognition>
+<Drone Surveillance, connectedTo, Video Analytics>
+<Environmental Monitoring, connectedTo, Pattern Recognition>
+<Environmental Monitoring, connectedTo, Satellite Imaging>
+<Environmental Monitoring, connectedTo, Thermal Imaging>
+<Environmental Monitoring, connectedTo, Wildlife Tracking>
+<Facial Recognition Systems, connectedTo, Wildlife Tracking>
+<GPS Tracking, connectedTo, Thermal Imaging>
+<Industrial Surveillance, connectedTo, Environmental Monitoring>
+<Network Monitoring, connectedTo, Traffic Surveillance>
+<Night Vision Technology, connectedTo, Drone Surveillance>
+<Pattern Recognition, connectedTo, Network Monitoring>
+<Pattern Recognition, connectedTo, Predictive Policing>
+<Pattern Recognition, connectedTo, Thermal Imaging>
+<Physical Security Integration, connectedTo, Facial Recognition Systems>
+<Physical Security Integration, connectedTo, Wildlife Tracking>
+<Predictive Policing, connectedTo, CCTV Monitoring>
+<Privacy Concerns Mitigation, connectedTo, Physical Security Integration>
+<Public Space Monitoring, connectedTo, Privacy Concerns Mitigation>
+<Remote Sensing, connectedTo, Real_time Alerts>
+<Satellite Imaging, tracks, Anomaly Detection>
+<Security Personnel Operations, connectedTo, Remote Sensing>
+<Thermal Imaging, connectedTo, Automated Threat Detection>
+<Traffic Surveillance, connectedTo, Privacy Concerns Mitigation>
+<Video Analytics, authenticates, Industrial Surveillance>
+<Video Analytics, connectedTo, Thermal Imaging>
+<Video Analytics, connectedTo, Traffic Surveillance>
+<Video Analytics, privacy_protects, Wildlife Tracking>
+<Wildlife Tracking, connectedTo, Data Collection>
diff --git a/test/diagrams/graph_hard/diagrams_31.dot b/test/diagrams/graph_hard/diagrams_31.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3294dc06262a28fe729a1205608f7bf72470abb2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_31.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=RL
+	N0 [label="Soil Nutrient Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=rectangle style=filled]
+	N1 [label="Livestock Feeding" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	N2 [label="Precision Farming" color="#90A4AE" fillcolor="#ECEFF1" shape=multipledocuments style=filled]
+	N3 [label="Soil Testing" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N4 [label="Yield Prediction" color="#C2B2F0" fillcolor="#EFE6FF" shape=database style=filled]
+	N5 [label="Food Processing" color="#C2B2F0" fillcolor="#EFE6FF" shape=action style=filled]
+	N6 [label="Seedling Transplanting" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	N7 [label="Irrigation Scheduling" color="#FFD54F" fillcolor="#FFF8E1" shape=document style=filled]
+	N8 [label="Agricultural Research" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	N9 [label="Fencing Installation" color="#90A4AE" fillcolor="#ECEFF1" shape=multipledocuments style=filled]
+	N10 [label="Hydroponic System Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N11 [label="Drone Scouting" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+	N12 [label="Crop Rotation Planning" color="#C2B2F0" fillcolor="#EFE6FF" shape=document style=filled]
+	N13 [label="Aquaculture Farming" color="#C2B2F0" fillcolor="#EFE6FF" shape=preparation style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Grain Drying {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Grain Drying"
+		nest0_0 [label="Organic Certification" color="#FFD54F" fillcolor="#FFF8E1" shape=parallelogram style=filled]
+		nest0_1 [label="Weather Tracking" color="#C2B2F0" fillcolor="#EFE6FF" shape=preparation style=filled]
+	}
+	subgraph cluster_Farm Machinery Operation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Farm Machinery Operation"
+		nest1_0 [label="Barn Cleaning" color="#90A4AE" fillcolor="#ECEFF1" shape=inputoutput style=filled]
+		nest1_1 [label="Storage" color="#FFD54F" fillcolor="#FFF8E1" shape=action style=filled]
+		nest1_2 [label="Market Transportation" color="#C2B2F0" fillcolor="#EFE6FF" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> nest0_0 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N4 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#FFD54F" penwidth=1.5 style=dashed label="transports" dir=forward]
+	S0 -> N8 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=dashed label="distributes" dir=forward]
+	N0 -> M0 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	M0 -> N7 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N9 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_31.txt b/test/diagrams/graph_hard/diagrams_31.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d8e3c26084b89aaf63299ef58689482a8fe53592
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_31.txt
@@ -0,0 +1,27 @@
+<Agricultural Research, connectedTo, Fencing Installation>
+<Barn Cleaning, connectedTo, Storage>
+<Crop Rotation Planning, connectedTo, Aquaculture Farming>
+<Drone Scouting, connectedTo, Crop Rotation Planning>
+<Drone Scouting, connectedTo, Organic Certification>
+<Fencing Installation, connectedTo, Hydroponic System Management>
+<Food Processing, connectedTo, Seedling Transplanting>
+<Hydroponic System Management, connectedTo, Barn Cleaning>
+<Hydroponic System Management, connectedTo, Drone Scouting>
+<Irrigation Scheduling, connectedTo, Agricultural Research>
+<Livestock Feeding, connectedTo, Agricultural Research>
+<Livestock Feeding, connectedTo, Precision Farming>
+<Livestock Feeding, transports, Irrigation Scheduling>
+<Market Transportation, connectedTo, Livestock Feeding>
+<Organic Certification, connectedTo, Weather Tracking>
+<Precision Farming, connectedTo, Soil Testing>
+<Seedling Transplanting, connectedTo, Irrigation Scheduling>
+<Soil Nutrient Management, connectedTo, Fencing Installation>
+<Soil Nutrient Management, connectedTo, Irrigation Scheduling>
+<Soil Nutrient Management, connectedTo, Livestock Feeding>
+<Soil Testing, connectedTo, Fencing Installation>
+<Soil Testing, connectedTo, Irrigation Scheduling>
+<Soil Testing, connectedTo, Yield Prediction>
+<Storage, connectedTo, Market Transportation>
+<Weather Tracking, connectedTo, Yield Prediction>
+<Yield Prediction, connectedTo, Food Processing>
+<Yield Prediction, distributes, Irrigation Scheduling>
diff --git a/test/diagrams/graph_hard/diagrams_310.dot b/test/diagrams/graph_hard/diagrams_310.dot
new file mode 100644
index 0000000000000000000000000000000000000000..732954fbcc3e83ceb01eb87bf08d7016e2b3eb21
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_310.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=BT
+	N0 [label="Law Enforcement Training" color="#2196F3" fillcolor="#BBDEFB" shape=diamond style=filled]
+	N1 [label="Vehicle Theft Prevention" color="#2196F3" fillcolor="#BBDEFB" shape=rect style=filled]
+	N2 [label="Crisis Intervention" color="#2196F3" fillcolor="#BBDEFB" shape=action style=filled]
+	N3 [label="Environmental Design" color="#2196F3" fillcolor="#BBDEFB" shape=vnode_shape style=filled]
+	N4 [label="Policy Development for Prevention" color="#2196F3" fillcolor="#BBDEFB" shape=rect style=filled]
+	N5 [label="Patrol Operations" color="#2196F3" fillcolor="#BBDEFB" shape=rect style=filled]
+	N6 [label="Crime Prevention Through Education" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N7 [label="Gang Intervention" color="#BCB88A" fillcolor="#F5F5DC" shape=rectangle style=filled]
+	N8 [label="Public Awareness Campaigns" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+	N9 [label="School Safety Programs" color="#BCB88A" fillcolor="#F5F5DC" shape=multipledocuments style=filled]
+	N10 [label="Fraud Prevention" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N11 [label="Early Intervention Programs" color="#FFC107" fillcolor="#FFECB3" shape=database style=filled]
+	S1 [label="" color="#FFC107" fillcolor="#FFECB3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#2196F3" fillcolor="#BBDEFB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#2196F3" fillcolor="#BBDEFB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFC107" fillcolor="#FFECB3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Behavioral Science in Prevention {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Behavioral Science in Prevention"
+		nest0_0 [label="Robbery Prevention" color="#FFC107" fillcolor="#FFECB3" shape=inputoutput style=filled]
+		nest0_1 [label="Victim Support Services" color="#2196F3" fillcolor="#BBDEFB" shape=rect style=filled]
+	}
+	subgraph cluster_Deterrence Strategies {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Deterrence Strategies"
+		nest1_0 [label="Hotspot Policing" color="#2196F3" fillcolor="#BBDEFB" shape=preparation style=filled]
+		nest1_1 [label="Situational Crime Prevention" color="#2196F3" fillcolor="#BBDEFB" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#BCB88A" penwidth=1.5 style=dashed label="monitors" dir=forward]
+	nest0_0 -> nest0_1 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N2 -> nest0_0 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N1 [color="#2196F3" penwidth=1.5 style=solid label="policies_implements" dir=forward]
+	nest1_0 -> nest1_1 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N11 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N3 [color="#2196F3" penwidth=1.5 style=solid label="community_engages" dir=forward]
+	N2 -> S2 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N8 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#000000" penwidth=1.5 style=solid label="supports_victims" dir=forward]
+	N2 -> M0 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N10 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=dashed label="secures" dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_310.txt b/test/diagrams/graph_hard/diagrams_310.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ce1ee7c96d748c63ddbac401128401d1b7bc1f18
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_310.txt
@@ -0,0 +1,28 @@
+<Crime Prevention Through Education, connectedTo, Gang Intervention>
+<Crisis Intervention, connectedTo, Crime Prevention Through Education>
+<Crisis Intervention, connectedTo, Environmental Design>
+<Crisis Intervention, connectedTo, Fraud Prevention>
+<Crisis Intervention, connectedTo, Public Awareness Campaigns>
+<Crisis Intervention, connectedTo, Robbery Prevention>
+<Environmental Design, connectedTo, Crime Prevention Through Education>
+<Environmental Design, connectedTo, Fraud Prevention>
+<Environmental Design, connectedTo, Policy Development for Prevention>
+<Fraud Prevention, monitors, Early Intervention Programs>
+<Gang Intervention, connectedTo, Public Awareness Campaigns>
+<Hotspot Policing, connectedTo, Situational Crime Prevention>
+<Law Enforcement Training, connectedTo, Crime Prevention Through Education>
+<Law Enforcement Training, connectedTo, Vehicle Theft Prevention>
+<Patrol Operations, connectedTo, Crime Prevention Through Education>
+<Patrol Operations, supports_victims, Fraud Prevention>
+<Policy Development for Prevention, connectedTo, Patrol Operations>
+<Policy Development for Prevention, secures, Crime Prevention Through Education>
+<Public Awareness Campaigns, connectedTo, School Safety Programs>
+<Robbery Prevention, connectedTo, Victim Support Services>
+<School Safety Programs, connectedTo, Fraud Prevention>
+<Situational Crime Prevention, connectedTo, Early Intervention Programs>
+<Vehicle Theft Prevention, community_engages, Environmental Design>
+<Vehicle Theft Prevention, connectedTo, Crisis Intervention>
+<Vehicle Theft Prevention, connectedTo, Hotspot Policing>
+<Vehicle Theft Prevention, connectedTo, Policy Development for Prevention>
+<Vehicle Theft Prevention, connectedTo, Public Awareness Campaigns>
+<Victim Support Services, policies_implements, Vehicle Theft Prevention>
diff --git a/test/diagrams/graph_hard/diagrams_311.dot b/test/diagrams/graph_hard/diagrams_311.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8a9c2471c8f80750048605dffc036eecc33d09b2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_311.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=LR
+	N0 [label="Vehicle Theft Prevention" color="#FFF8A6" fillcolor="#FFFDE0" shape=vnode_shape style=filled]
+	N1 [label="Rehabilitation Programs" color="#80DDEA" fillcolor="#D3F7F9" shape=multipledocuments style=filled]
+	N2 [label="Robbery Prevention" color="#FFE69C" fillcolor="#FFF9D4" shape=predefinedprocess style=filled]
+	N3 [label="Security Lighting" color="#80DDEA" fillcolor="#D3F7F9" shape=predefinedprocess style=filled]
+	N4 [label="Gun Violence Prevention" color="#FFF8A6" fillcolor="#FFFDE0" shape=rectangle style=filled]
+	N5 [label="Crisis Intervention" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+	N6 [label="Public Awareness Campaigns" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+	N7 [label="Victim Support Services" color="#FFF8A6" fillcolor="#FFFDE0" shape=database style=filled]
+	N8 [label="Conflict Resolution Training" color="#FFE69C" fillcolor="#FFF9D4" shape=preparation style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFE69C" fillcolor="#FFF9D4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Fraud Prevention {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Fraud Prevention"
+		nest0_0 [label="Drug Prevention Initiatives" color="#FFE69C" fillcolor="#FFF9D4" shape=rectangle style=filled]
+		nest0_1 [label="Restorative Justice" color="#FFE69C" fillcolor="#FFF9D4" shape=inputoutput style=filled]
+		nest0_2 [label="Crime Data Analysis" color="#FFE69C" fillcolor="#FFF9D4" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Law Enforcement Training {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Law Enforcement Training"
+		nest1_0 [label="Mediation Services" color="#FFF8A6" fillcolor="#FFFDE0" shape=action style=filled]
+		nest1_1 [label="Situational Crime Prevention" color="#80DDEA" fillcolor="#D3F7F9" shape=document style=filled]
+		nest1_2 [label="Cybercrime Prevention" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest1_3 [label="CCTV Installation" color="#FFF8A6" fillcolor="#FFFDE0" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#80DDEA" penwidth=1.5 style=solid label="identifies_risks" dir=forward]
+	N2 -> N3 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#80DDEA" penwidth=1.5 style=dashed label="crime_types" dir=forward]
+	N1 -> nest0_0 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N1 [color="#000000" penwidth=1.5 style=solid label="licenses" dir=forward]
+	N2 -> S0 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N0 -> S2 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N3 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N5 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_312.dot b/test/diagrams/graph_hard/diagrams_312.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e34bafdf21347b8477a0bd2a26210e757b0d8e3b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_312.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=BT
+	N0 [label="Technology for Prevention" color="#92C79A" fillcolor="#E8F0EA" shape=document style=filled]
+	N1 [label="Vehicle Theft Prevention" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+	N2 [label="Early Intervention Programs" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+	N3 [label="Youth Programs" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N4 [label="CCTV Installation" color="#92C79A" fillcolor="#E8F0EA" shape=predefinedprocess style=filled]
+	N5 [label="Cybercrime Prevention" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N6 [label="Gun Violence Prevention" color="#673AB7" fillcolor="#D1C4E9" shape=predefinedprocess style=filled]
+	S0 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#92C79A" fillcolor="#E8F0EA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#92C79A" fillcolor="#E8F0EA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#673AB7" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Hotspot Policing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Hotspot Policing"
+		nest0_0 [label="Environmental Design" color="#92C79A" fillcolor="#E8F0EA" shape=rectangle style=filled]
+		nest0_1 [label="Rehabilitation Programs" color="#9575CD" fillcolor="#EDE7F6" shape=predefinedprocess style=filled]
+		nest0_2 [label="Mediation Services" color="#9575CD" fillcolor="#EDE7F6" shape=document style=filled]
+		nest0_3 [label="Drug Prevention Initiatives" color="#92C79A" fillcolor="#E8F0EA" shape=preparation style=filled]
+	}
+	subgraph cluster_Reintegration Programs {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Reintegration Programs"
+		nest1_0 [label="School Safety Programs" color="#9575CD" fillcolor="#EDE7F6" shape=predefinedprocess style=filled]
+		nest1_1 [label="Law Enforcement Training" color="#673AB7" fillcolor="#D1C4E9" shape=preparation style=filled]
+		nest1_2 [label="Public Awareness Campaigns" color="#673AB7" fillcolor="#D1C4E9" shape=action style=filled]
+		nest1_3 [label="Burglary Prevention" color="#673AB7" fillcolor="#D1C4E9" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#92C79A" penwidth=1.5 style=solid label="environments_designs" dir=forward]
+	nest0_1 -> nest0_2 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest0_0 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N6 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N5 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S0 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N3 [color="#92C79A" penwidth=1.5 style=dashed label="consults" dir=forward]
+	N1 -> S1 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N3 [color="#92C79A" penwidth=1.5 style=solid label="analyzes_data" dir=forward]
+	S1 -> N4 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N3 -> S2 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_312.txt b/test/diagrams/graph_hard/diagrams_312.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fb86549c57035bbffa5743f7c6eb62451b012087
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_312.txt
@@ -0,0 +1,25 @@
+<Burglary Prevention, connectedTo, Cybercrime Prevention>
+<CCTV Installation, connectedTo, Cybercrime Prevention>
+<CCTV Installation, connectedTo, Gun Violence Prevention>
+<Cybercrime Prevention, connectedTo, Gun Violence Prevention>
+<Drug Prevention Initiatives, connectedTo, Gun Violence Prevention>
+<Early Intervention Programs, connectedTo, Gun Violence Prevention>
+<Early Intervention Programs, connectedTo, Youth Programs>
+<Environmental Design, environments_designs, Rehabilitation Programs>
+<Law Enforcement Training, connectedTo, Public Awareness Campaigns>
+<Mediation Services, connectedTo, Drug Prevention Initiatives>
+<Public Awareness Campaigns, connectedTo, Burglary Prevention>
+<Rehabilitation Programs, connectedTo, Mediation Services>
+<School Safety Programs, connectedTo, Law Enforcement Training>
+<Technology for Prevention, connectedTo, Vehicle Theft Prevention>
+<Vehicle Theft Prevention, analyzes_data, Youth Programs>
+<Vehicle Theft Prevention, connectedTo, CCTV Installation>
+<Vehicle Theft Prevention, connectedTo, Cybercrime Prevention>
+<Vehicle Theft Prevention, connectedTo, Early Intervention Programs>
+<Vehicle Theft Prevention, connectedTo, Environmental Design>
+<Vehicle Theft Prevention, connectedTo, Gun Violence Prevention>
+<Vehicle Theft Prevention, consults, Youth Programs>
+<Youth Programs, connectedTo, CCTV Installation>
+<Youth Programs, connectedTo, Cybercrime Prevention>
+<Youth Programs, connectedTo, Gun Violence Prevention>
+<Youth Programs, connectedTo, School Safety Programs>
diff --git a/test/diagrams/graph_hard/diagrams_314.dot b/test/diagrams/graph_hard/diagrams_314.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b0ce2ce881ec6fd94ca1f187c5bf844872f865e7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_314.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=BT
+	N0 [label="Population Dynamics Study" color="#CD8FF2" fillcolor="#ECCFF5" shape=inputoutput style=filled]
+	N1 [label="Conservation Genetics" color="#FFCC80" fillcolor="#FFF0CC" shape=predefinedprocess style=filled]
+	N2 [label="Ecological Survey" color="#FFCC80" fillcolor="#FFF0CC" shape=document style=filled]
+	N3 [label="Satellite Tracking of Animals" color="#795548" fillcolor="#D7CCC8" shape=rect style=filled]
+	N4 [label="International Treaties Enforcement" color="#FFCC80" fillcolor="#FFF0CC" shape=document style=filled]
+	N5 [label="Climate Change Adaptation for Wildlife" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N6 [label="Genetic Diversity Analysis" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N7 [label="Marine Conservation" color="#CD8FF2" fillcolor="#ECCFF5" shape=rectangle style=filled]
+	N8 [label="Pollution Impact Assessment" color="#CD8FF2" fillcolor="#ECCFF5" shape=predefinedprocess style=filled]
+	N9 [label="Grassland Conservation" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+	S0 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFCC80" fillcolor="#FFF0CC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Anti_Poaching Operations {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Anti_Poaching Operations"
+		nest0_0 [label="Species Monitoring" color="#FFCC80" fillcolor="#FFF0CC" shape=vnode_shape style=filled]
+		nest0_1 [label="Camera Trap Deployment" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+		nest0_2 [label="Captive Breeding Programs" color="#CD8FF2" fillcolor="#ECCFF5" shape=rect style=filled]
+		nest0_3 [label="Remote Sensing for Conservation" color="#FFCC80" fillcolor="#FFF0CC" shape=document style=filled]
+	}
+	subgraph cluster_Carbon Sequestration in Habitats {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Carbon Sequestration in Habitats"
+		nest1_0 [label="Reintroduction Programs" color="#CD8FF2" fillcolor="#ECCFF5" shape=hexagon style=filled]
+		nest1_1 [label="Habitat Restoration" color="#795548" fillcolor="#D7CCC8" shape=multipledocuments style=filled]
+		nest1_2 [label="Drone_based Monitoring" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#795548" penwidth=1.5 style=solid label="translocates" dir=forward]
+	N7 -> N8 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest0_0 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N4 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	M0 -> N8 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#CD8FF2" penwidth=1.5 style=dashed label="studies" dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_314.txt b/test/diagrams/graph_hard/diagrams_314.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b16b5647bc1f08bfd9cb017cce61d1e6f1c15f6d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_314.txt
@@ -0,0 +1,28 @@
+<Camera Trap Deployment, connectedTo, Captive Breeding Programs>
+<Captive Breeding Programs, connectedTo, Remote Sensing for Conservation>
+<Climate Change Adaptation for Wildlife, connectedTo, Genetic Diversity Analysis>
+<Conservation Genetics, connectedTo, Ecological Survey>
+<Conservation Genetics, studies, Grassland Conservation>
+<Drone_based Monitoring, connectedTo, International Treaties Enforcement>
+<Ecological Survey, connectedTo, Climate Change Adaptation for Wildlife>
+<Ecological Survey, connectedTo, Grassland Conservation>
+<Ecological Survey, connectedTo, International Treaties Enforcement>
+<Ecological Survey, connectedTo, Satellite Tracking of Animals>
+<Genetic Diversity Analysis, connectedTo, Pollution Impact Assessment>
+<Genetic Diversity Analysis, translocates, Marine Conservation>
+<Habitat Restoration, connectedTo, Drone_based Monitoring>
+<International Treaties Enforcement, connectedTo, Climate Change Adaptation for Wildlife>
+<International Treaties Enforcement, connectedTo, Pollution Impact Assessment>
+<Marine Conservation, connectedTo, Pollution Impact Assessment>
+<Pollution Impact Assessment, connectedTo, Grassland Conservation>
+<Pollution Impact Assessment, connectedTo, Reintroduction Programs>
+<Population Dynamics Study, connectedTo, Conservation Genetics>
+<Reintroduction Programs, connectedTo, Habitat Restoration>
+<Remote Sensing for Conservation, connectedTo, Conservation Genetics>
+<Satellite Tracking of Animals, connectedTo, Climate Change Adaptation for Wildlife>
+<Satellite Tracking of Animals, connectedTo, Genetic Diversity Analysis>
+<Satellite Tracking of Animals, connectedTo, Grassland Conservation>
+<Satellite Tracking of Animals, connectedTo, International Treaties Enforcement>
+<Satellite Tracking of Animals, connectedTo, Pollution Impact Assessment>
+<Satellite Tracking of Animals, connectedTo, Species Monitoring>
+<Species Monitoring, connectedTo, Camera Trap Deployment>
diff --git a/test/diagrams/graph_hard/diagrams_315.dot b/test/diagrams/graph_hard/diagrams_315.dot
new file mode 100644
index 0000000000000000000000000000000000000000..77bc54b373632c33e424894887ae83b7a6733089
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_315.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=TB
+	N0 [label="Rewilding Initiatives" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N1 [label="Drone_based Monitoring" color="#B0C5CD" fillcolor="#DFE7EB" shape=preparation style=filled]
+	N2 [label="Ecotourism Management" color="#B0C5CD" fillcolor="#DFE7EB" shape=action style=filled]
+	N3 [label="Data Management for Conservation" color="#73C6BC" fillcolor="#D0EFEE" shape=document style=filled]
+	N4 [label="Satellite Tracking of Animals" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N5 [label="Captive Breeding Programs" color="#7E57C2" fillcolor="#D1C4E9" shape=vnode_shape style=filled]
+	N6 [label="Forestry Practices for Conservation" color="#73C6BC" fillcolor="#D0EFEE" shape=rectangle style=filled]
+	N7 [label="Research and Development in Conservation" color="#7E57C2" fillcolor="#D1C4E9" shape=rect style=filled]
+	N8 [label="Fundraising for Conservation" color="#73C6BC" fillcolor="#D0EFEE" shape=action style=filled]
+	N9 [label="Ecosystem Services Valuation" color="#73C6BC" fillcolor="#D0EFEE" shape=parallelogram style=filled]
+	N10 [label="Genetic Diversity Analysis" color="#73C6BC" fillcolor="#D0EFEE" shape=predefinedprocess style=filled]
+	N11 [label="Reintroduction Programs" color="#73C6BC" fillcolor="#D0EFEE" shape=multipledocuments style=filled]
+	N12 [label="Camera Trap Deployment" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+	N13 [label="Remote Sensing for Conservation" color="#7E57C2" fillcolor="#D1C4E9" shape=action style=filled]
+	N14 [label="Community Engagement" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	S0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Sustainable Resource Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Sustainable Resource Management"
+		nest0_0 [label="Ecological Survey" color="#B0C5CD" fillcolor="#DFE7EB" shape=inputoutput style=filled]
+		nest0_1 [label="Invasive Species Control" color="#B0C5CD" fillcolor="#DFE7EB" shape=database style=filled]
+	}
+	subgraph cluster_Habitat Restoration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Habitat Restoration"
+		nest1_0 [label="Conservation Education" color="#B0C5CD" fillcolor="#DFE7EB" shape=multipledocuments style=filled]
+		nest1_1 [label="Freshwater Conservation" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+		nest1_2 [label="Marine Conservation" color="#B0C5CD" fillcolor="#DFE7EB" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N6 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest1_0 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N6 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> S1 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#B0C5CD" penwidth=1.5 style=dashed label="technologies_applies" dir=forward]
+	S1 -> N13 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N14 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_315.txt b/test/diagrams/graph_hard/diagrams_315.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c5c878e95bd831dabff0f9d9070c386459b90ded
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_315.txt
@@ -0,0 +1,27 @@
+<Camera Trap Deployment, connectedTo, Conservation Education>
+<Camera Trap Deployment, connectedTo, Remote Sensing for Conservation>
+<Captive Breeding Programs, connectedTo, Forestry Practices for Conservation>
+<Conservation Education, connectedTo, Freshwater Conservation>
+<Data Management for Conservation, connectedTo, Ecological Survey>
+<Data Management for Conservation, connectedTo, Remote Sensing for Conservation>
+<Data Management for Conservation, connectedTo, Satellite Tracking of Animals>
+<Data Management for Conservation, technologies_applies, Ecosystem Services Valuation>
+<Drone_based Monitoring, connectedTo, Camera Trap Deployment>
+<Drone_based Monitoring, connectedTo, Ecotourism Management>
+<Drone_based Monitoring, connectedTo, Research and Development in Conservation>
+<Drone_based Monitoring, connectedTo, Satellite Tracking of Animals>
+<Ecological Survey, connectedTo, Invasive Species Control>
+<Ecosystem Services Valuation, connectedTo, Genetic Diversity Analysis>
+<Ecotourism Management, connectedTo, Data Management for Conservation>
+<Forestry Practices for Conservation, connectedTo, Research and Development in Conservation>
+<Freshwater Conservation, connectedTo, Marine Conservation>
+<Fundraising for Conservation, connectedTo, Community Engagement>
+<Fundraising for Conservation, connectedTo, Ecosystem Services Valuation>
+<Genetic Diversity Analysis, connectedTo, Reintroduction Programs>
+<Invasive Species Control, connectedTo, Forestry Practices for Conservation>
+<Marine Conservation, connectedTo, Forestry Practices for Conservation>
+<Reintroduction Programs, connectedTo, Camera Trap Deployment>
+<Remote Sensing for Conservation, connectedTo, Community Engagement>
+<Research and Development in Conservation, connectedTo, Fundraising for Conservation>
+<Rewilding Initiatives, connectedTo, Drone_based Monitoring>
+<Satellite Tracking of Animals, connectedTo, Captive Breeding Programs>
diff --git a/test/diagrams/graph_hard/diagrams_316.dot b/test/diagrams/graph_hard/diagrams_316.dot
new file mode 100644
index 0000000000000000000000000000000000000000..19129231aedf223b1813ad289a03bc8ccaf67e34
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_316.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=BT
+	N0 [label="Marine Remote Sensing" color="#FFD54F" fillcolor="#FFF8E1" shape=multipledocuments style=filled]
+	N1 [label="ROV or AUV Operations" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+	N2 [label="Coral Reef Monitoring" color="#FFD54F" fillcolor="#FFF8E1" shape=inputoutput style=filled]
+	N3 [label="Acoustic Oceanography" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N4 [label="Plastic Pollution Research" color="#A188DB" fillcolor="#DED7F0" shape=rect style=filled]
+	N5 [label="Coastal Zone Management" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N6 [label="Chemical Oceanography" color="#A188DB" fillcolor="#DED7F0" shape=inputoutput style=filled]
+	N7 [label="Ocean Carbon Cycle" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N8 [label="Ocean Drilling Programs" color="#A188DB" fillcolor="#DED7F0" shape=preparation style=filled]
+	N9 [label="Ocean Modeling" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N10 [label="Physical Oceanography" color="#DCE775" fillcolor="#FCFCE7" shape=inputoutput style=filled]
+	N11 [label="Ocean Temperature Sensing" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+	N12 [label="Sediment Analysis" color="#DCE775" fillcolor="#FCFCE7" shape=vnode_shape style=filled]
+	N13 [label="Tsunami Prediction" color="#DCE775" fillcolor="#FCFCE7" shape=action style=filled]
+	N14 [label="Polar Oceanography" color="#DCE775" fillcolor="#FCFCE7" shape=action style=filled]
+	N15 [label="Salinity Measurement" color="#DCE775" fillcolor="#FCFCE7" shape=hexagon style=filled]
+	N16 [label="Marine Life Observation" color="#FFD54F" fillcolor="#FFF8E1" shape=action style=filled]
+	S0 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Marine Biodiversity Assessment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Marine Biodiversity Assessment"
+		nest0_0 [label="Hydrothermal Vent Exploration" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+		nest0_1 [label="Ocean Current Measurement" color="#DCE775" fillcolor="#FCFCE7" shape=rect style=filled]
+	}
+	subgraph cluster_Marine Protected Area Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Marine Protected Area Planning"
+		nest1_0 [label="Climate Change Impact Study" color="#DCE775" fillcolor="#FCFCE7" shape=database style=filled]
+		nest1_1 [label="Ocean Floor Mapping" color="#FFD54F" fillcolor="#FFF8E1" shape=multipledocuments style=filled]
+		nest1_2 [label="Deep_Sea Exploration" color="#DCE775" fillcolor="#FCFCE7" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFD54F" penwidth=1.5 style=dashed label="advises" dir=forward]
+	N9 -> N10 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N15 -> nest0_0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest1_0 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S1 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N3 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N16 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#FFD54F" penwidth=1.5 style=dashed label="educates" dir=forward]
+	M0 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> M1 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	M1 -> N15 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_316.txt b/test/diagrams/graph_hard/diagrams_316.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8da59d2fc3e73b2c9316d13f60fb436239a60b39
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_316.txt
@@ -0,0 +1,37 @@
+<Acoustic Oceanography, connectedTo, Plastic Pollution Research>
+<Chemical Oceanography, connectedTo, Climate Change Impact Study>
+<Chemical Oceanography, connectedTo, Ocean Carbon Cycle>
+<Climate Change Impact Study, connectedTo, Ocean Floor Mapping>
+<Coastal Zone Management, connectedTo, Chemical Oceanography>
+<Coastal Zone Management, connectedTo, Salinity Measurement>
+<Coral Reef Monitoring, connectedTo, Acoustic Oceanography>
+<Coral Reef Monitoring, connectedTo, Chemical Oceanography>
+<Deep_Sea Exploration, connectedTo, Tsunami Prediction>
+<Hydrothermal Vent Exploration, connectedTo, Ocean Current Measurement>
+<Marine Remote Sensing, connectedTo, Acoustic Oceanography>
+<Marine Remote Sensing, connectedTo, Chemical Oceanography>
+<Marine Remote Sensing, connectedTo, Coastal Zone Management>
+<Marine Remote Sensing, connectedTo, Ocean Modeling>
+<Marine Remote Sensing, connectedTo, Polar Oceanography>
+<Marine Remote Sensing, connectedTo, ROV or AUV Operations>
+<Ocean Carbon Cycle, connectedTo, Ocean Drilling Programs>
+<Ocean Current Measurement, connectedTo, Ocean Temperature Sensing>
+<Ocean Drilling Programs, advises, Ocean Modeling>
+<Ocean Floor Mapping, connectedTo, Deep_Sea Exploration>
+<Ocean Modeling, connectedTo, Physical Oceanography>
+<Ocean Temperature Sensing, connectedTo, Polar Oceanography>
+<Ocean Temperature Sensing, connectedTo, Salinity Measurement>
+<Ocean Temperature Sensing, connectedTo, Sediment Analysis>
+<Ocean Temperature Sensing, connectedTo, Tsunami Prediction>
+<Physical Oceanography, connectedTo, Ocean Temperature Sensing>
+<Plastic Pollution Research, connectedTo, Coastal Zone Management>
+<Plastic Pollution Research, connectedTo, Marine Life Observation>
+<Plastic Pollution Research, connectedTo, Sediment Analysis>
+<Polar Oceanography, connectedTo, Salinity Measurement>
+<ROV or AUV Operations, connectedTo, Coral Reef Monitoring>
+<ROV or AUV Operations, educates, Chemical Oceanography>
+<Salinity Measurement, connectedTo, Hydrothermal Vent Exploration>
+<Salinity Measurement, connectedTo, Marine Life Observation>
+<Sediment Analysis, connectedTo, Tsunami Prediction>
+<Tsunami Prediction, connectedTo, Polar Oceanography>
+<Tsunami Prediction, connectedTo, Salinity Measurement>
diff --git a/test/diagrams/graph_hard/diagrams_317.dot b/test/diagrams/graph_hard/diagrams_317.dot
new file mode 100644
index 0000000000000000000000000000000000000000..74b27ea8cbb2953505ad381dda36139755bb55e8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_317.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=BT
+	N0 [label="ROV or AUV Operations" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N1 [label="Hydrothermal Vent Exploration" color="#FFD54F" fillcolor="#FFF8E1" shape=rectangle style=filled]
+	N2 [label="Acoustic Oceanography" color="#5C6BC0" fillcolor="#E8EAF6" shape=database style=filled]
+	N3 [label="Sea Level Monitoring" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N4 [label="Deep_Sea Exploration" color="#FFD54F" fillcolor="#FFF8E1" shape=multipledocuments style=filled]
+	N5 [label="Coral Reef Monitoring" color="#FFD54F" fillcolor="#FFF8E1" shape=action style=filled]
+	N6 [label="Marine Pollution Monitoring" color="#6EB76D" fillcolor="#E9F7E8" shape=document style=filled]
+	N7 [label="Marine Life Observation" color="#FFD54F" fillcolor="#FFF8E1" shape=preparation style=filled]
+	N8 [label="Chemical Oceanography" color="#5C6BC0" fillcolor="#E8EAF6" shape=document style=filled]
+	N9 [label="Underwater Acoustics" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+	N10 [label="Coastal Erosion Research" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+	N11 [label="Data Visualization" color="#5C6BC0" fillcolor="#E8EAF6" shape=document style=filled]
+	S0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Biological Oceanography {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Biological Oceanography"
+		nest0_0 [label="Ocean Floor Mapping" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+		nest0_1 [label="Marine Protected Area Planning" color="#FFD54F" fillcolor="#FFF8E1" shape=database style=filled]
+		nest0_2 [label="Marine Hazards Assessment" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+		nest0_3 [label="Physical Oceanography" color="#5C6BC0" fillcolor="#E8EAF6" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Coastal Zone Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Coastal Zone Management"
+		nest1_0 [label="Ocean Data Archiving" color="#6EB76D" fillcolor="#E9F7E8" shape=multipledocuments style=filled]
+		nest1_1 [label="Marine Biodiversity Assessment" color="#6EB76D" fillcolor="#E9F7E8" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed label="waves" dir=forward]
+	nest0_1 -> nest0_2 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid label="educates" dir=forward]
+	N5 -> nest0_0 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N7 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest1_0 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N10 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> S1 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#FFD54F" penwidth=1.5 style=dashed label="maintains_buoys" dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=dashed label="marine_life" dir=forward]
+	N1 -> M1 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N10 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N4 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_317.txt b/test/diagrams/graph_hard/diagrams_317.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1195abedfa7a4e82027ce75e5e50d4f0a110fb66
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_317.txt
@@ -0,0 +1,30 @@
+<Acoustic Oceanography, connectedTo, Deep_Sea Exploration>
+<Acoustic Oceanography, connectedTo, Sea Level Monitoring>
+<Acoustic Oceanography, marine_life, Coastal Erosion Research>
+<Chemical Oceanography, connectedTo, Data Visualization>
+<Chemical Oceanography, connectedTo, Ocean Data Archiving>
+<Chemical Oceanography, connectedTo, Underwater Acoustics>
+<Chemical Oceanography, maintains_buoys, Coastal Erosion Research>
+<Coastal Erosion Research, connectedTo, Data Visualization>
+<Coral Reef Monitoring, connectedTo, Coastal Erosion Research>
+<Coral Reef Monitoring, connectedTo, Data Visualization>
+<Coral Reef Monitoring, connectedTo, Marine Life Observation>
+<Coral Reef Monitoring, connectedTo, Marine Pollution Monitoring>
+<Coral Reef Monitoring, connectedTo, Ocean Floor Mapping>
+<Deep_Sea Exploration, connectedTo, Coral Reef Monitoring>
+<Hydrothermal Vent Exploration, connectedTo, Acoustic Oceanography>
+<Hydrothermal Vent Exploration, connectedTo, Coastal Erosion Research>
+<Hydrothermal Vent Exploration, connectedTo, Deep_Sea Exploration>
+<Marine Biodiversity Assessment, connectedTo, Coastal Erosion Research>
+<Marine Hazards Assessment, educates, Physical Oceanography>
+<Marine Life Observation, connectedTo, Chemical Oceanography>
+<Marine Pollution Monitoring, connectedTo, Marine Life Observation>
+<Marine Protected Area Planning, connectedTo, Marine Hazards Assessment>
+<Ocean Data Archiving, connectedTo, Marine Biodiversity Assessment>
+<Ocean Floor Mapping, waves, Marine Protected Area Planning>
+<Physical Oceanography, connectedTo, Marine Life Observation>
+<ROV or AUV Operations, connectedTo, Coastal Erosion Research>
+<ROV or AUV Operations, connectedTo, Deep_Sea Exploration>
+<ROV or AUV Operations, connectedTo, Hydrothermal Vent Exploration>
+<Sea Level Monitoring, connectedTo, Deep_Sea Exploration>
+<Underwater Acoustics, connectedTo, Coastal Erosion Research>
diff --git a/test/diagrams/graph_hard/diagrams_318.dot b/test/diagrams/graph_hard/diagrams_318.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a36b716de0581cbc36d6e96b9e7fc7cbf5fd6792
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_318.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=LR
+	N0 [label="Satellite Oceanography" color="#3F51B5" fillcolor="#C5CAE9" shape=vnode_shape style=filled]
+	N1 [label="Climate Change Impact Study" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+	N2 [label="Polar Oceanography" color="#AB47BC" fillcolor="#F3E5F5" shape=preparation style=filled]
+	N3 [label="Marine Ecosystem Health" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N4 [label="Buoy Deployment" color="#E91E63" fillcolor="#FCE4EC" shape=preparation style=filled]
+	N5 [label="Acoustic Oceanography" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N6 [label="Underwater Acoustics" color="#AB47BC" fillcolor="#F3E5F5" shape=vnode_shape style=filled]
+	N7 [label="Ocean Data Archiving" color="#3F51B5" fillcolor="#C5CAE9" shape=rect style=filled]
+	N8 [label="Data Visualization" color="#AB47BC" fillcolor="#F3E5F5" shape=rect style=filled]
+	S0 [label="" color="#AB47BC" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Marine Remote Sensing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Marine Remote Sensing"
+		nest0_0 [label="Marine Hazards Assessment" color="#3F51B5" fillcolor="#C5CAE9" shape=rectangle style=filled]
+		nest0_1 [label="Biological Oceanography" color="#AB47BC" fillcolor="#F3E5F5" shape=rect style=filled]
+		nest0_2 [label="Chemical Oceanography" color="#AB47BC" fillcolor="#F3E5F5" shape=inputoutput style=filled]
+		nest0_3 [label="Coastal Erosion Research" color="#3F51B5" fillcolor="#C5CAE9" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Marine Protected Area Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Marine Protected Area Planning"
+		nest1_0 [label="Fisheries Management" color="#3F51B5" fillcolor="#C5CAE9" shape=rectangle style=filled]
+		nest1_1 [label="Hydrothermal Vent Exploration" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+		nest1_2 [label="Marine Life Observation" color="#E91E63" fillcolor="#FCE4EC" shape=action style=filled]
+		nest1_3 [label="Deep_Sea Exploration" color="#AB47BC" fillcolor="#F3E5F5" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid label="develops_instruments" dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#3F51B5" penwidth=1.5 style=solid label="maintains_buoys" dir=forward]
+	N3 -> N4 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N2 [color="#AB47BC" penwidth=1.5 style=solid label="collaborates" dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N3 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S2 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#AB47BC" penwidth=1.5 style=solid label="temperature" dir=forward]
+	S2 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#3F51B5" penwidth=1.5 style=dashed label="samples" dir=forward]
+	N3 -> M0 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#000000" penwidth=1.5 style=dashed label="marine_life" dir=forward]
+	M0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	M1 -> N3 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#AB47BC" penwidth=1.5 style=dashed label="advises" dir=forward]
+	N1 -> M2 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	M2 -> N6 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_318.txt b/test/diagrams/graph_hard/diagrams_318.txt
new file mode 100644
index 0000000000000000000000000000000000000000..df3a30095090871316dd0caae02fb0546d34037e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_318.txt
@@ -0,0 +1,29 @@
+<Acoustic Oceanography, connectedTo, Marine Hazards Assessment>
+<Acoustic Oceanography, connectedTo, Underwater Acoustics>
+<Acoustic Oceanography, marine_life, Ocean Data Archiving>
+<Biological Oceanography, connectedTo, Chemical Oceanography>
+<Buoy Deployment, connectedTo, Acoustic Oceanography>
+<Buoy Deployment, samples, Ocean Data Archiving>
+<Chemical Oceanography, connectedTo, Coastal Erosion Research>
+<Climate Change Impact Study, connectedTo, Fisheries Management>
+<Climate Change Impact Study, connectedTo, Marine Ecosystem Health>
+<Climate Change Impact Study, connectedTo, Polar Oceanography>
+<Climate Change Impact Study, connectedTo, Underwater Acoustics>
+<Coastal Erosion Research, collaborates, Polar Oceanography>
+<Deep_Sea Exploration, connectedTo, Marine Ecosystem Health>
+<Fisheries Management, connectedTo, Hydrothermal Vent Exploration>
+<Hydrothermal Vent Exploration, connectedTo, Marine Life Observation>
+<Marine Ecosystem Health, advises, Underwater Acoustics>
+<Marine Ecosystem Health, connectedTo, Acoustic Oceanography>
+<Marine Ecosystem Health, connectedTo, Buoy Deployment>
+<Marine Ecosystem Health, connectedTo, Ocean Data Archiving>
+<Marine Ecosystem Health, connectedTo, Underwater Acoustics>
+<Marine Ecosystem Health, temperature, Underwater Acoustics>
+<Marine Hazards Assessment, connectedTo, Biological Oceanography>
+<Marine Life Observation, connectedTo, Deep_Sea Exploration>
+<Ocean Data Archiving, connectedTo, Data Visualization>
+<Polar Oceanography, maintains_buoys, Marine Ecosystem Health>
+<Satellite Oceanography, connectedTo, Marine Ecosystem Health>
+<Satellite Oceanography, connectedTo, Underwater Acoustics>
+<Satellite Oceanography, develops_instruments, Climate Change Impact Study>
+<Underwater Acoustics, connectedTo, Ocean Data Archiving>
diff --git a/test/diagrams/graph_hard/diagrams_319.dot b/test/diagrams/graph_hard/diagrams_319.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0f8ffc861c9192a677fc010059cf500417044b83
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_319.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=TB
+	N0 [label="Seismic Tomography" color="#FBC02D" fillcolor="#FFFDE7" shape=rectangle style=filled]
+	N1 [label="Paleoseismology" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N2 [label="Aftershock Analysis" color="#4CAF50" fillcolor="#C8E6C9" shape=rectangle style=filled]
+	N3 [label="Structural Response to Earthquakes" color="#673AB7" fillcolor="#D1C4E9" shape=document style=filled]
+	N4 [label="Seismic Instrumentation Maintenance" color="#4CAF50" fillcolor="#C8E6C9" shape=preparation style=filled]
+	N5 [label="Seismic Inversion" color="#673AB7" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N6 [label="Seismic Data Processing" color="#4CAF50" fillcolor="#C8E6C9" shape=preparation style=filled]
+	N7 [label="Earthquake Prediction Research" color="#673AB7" fillcolor="#D1C4E9" shape=multipledocuments style=filled]
+	N8 [label="Tsunami Warning Systems" color="#FBC02D" fillcolor="#FFFDE7" shape=vnode_shape style=filled]
+	N9 [label="Building Code Development" color="#4CAF50" fillcolor="#C8E6C9" shape=database style=filled]
+	N10 [label="P_Wave or S_Wave Distinction" color="#FBC02D" fillcolor="#FFFDE7" shape=rectangle style=filled]
+	N11 [label="Planetary Seismology" color="#673AB7" fillcolor="#D1C4E9" shape=multipledocuments style=filled]
+	N12 [label="Earthquake Early Warning Systems" color="#673AB7" fillcolor="#D1C4E9" shape=multipledocuments style=filled]
+	N13 [label="Epicenter Location" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N14 [label="Subsurface Imaging" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N15 [label="Data Archiving and Distribution" color="#673AB7" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N16 [label="Liquefaction Potential Assessment" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#673AB7" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Seismic Array Deployment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Seismic Array Deployment"
+		nest0_0 [label="Deep Earth Seismology" color="#4CAF50" fillcolor="#C8E6C9" shape=vnode_shape style=filled]
+		nest0_1 [label="Geophysical Exploration" color="#FBC02D" fillcolor="#FFFDE7" shape=multipledocuments style=filled]
+		nest0_2 [label="Induced Seismicity Monitoring" color="#673AB7" fillcolor="#D1C4E9" shape=document style=filled]
+		nest0_3 [label="Seismic Wave Analysis" color="#4CAF50" fillcolor="#C8E6C9" shape=preparation style=filled]
+	}
+	subgraph cluster_Earth Structure Imaging {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Earth Structure Imaging"
+		nest1_0 [label="Microseismicity Study" color="#673AB7" fillcolor="#D1C4E9" shape=multipledocuments style=filled]
+		nest1_1 [label="Strong Motion Instrumentation" color="#4CAF50" fillcolor="#C8E6C9" shape=preparation style=filled]
+		nest1_2 [label="Earthquake Detection" color="#673AB7" fillcolor="#D1C4E9" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#FBC02D" penwidth=1.5 style=dashed label="detects" dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed label="alerts" dir=forward]
+	nest0_2 -> nest0_3 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> nest1_0 [color="#4CAF50" penwidth=1.5 style=dashed label="locates" dir=forward]
+	nest1_2 -> N1 [color="#673AB7" penwidth=1.5 style=dashed label="international_cooperates" dir=forward]
+	N4 -> S0 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=dashed label="risk_assesses" dir=forward]
+	S0 -> N7 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N10 -> S1 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N11 -> M0 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M0 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	M0 -> N15 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid label="forecasts" dir=forward]
+	N1 -> M1 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N5 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	M2 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_319.txt b/test/diagrams/graph_hard/diagrams_319.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4951116833a8bed1be33271ea0c1fd05e2f750fa
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_319.txt
@@ -0,0 +1,40 @@
+<Aftershock Analysis, connectedTo, Structural Response to Earthquakes>
+<Building Code Development, connectedTo, P_Wave or S_Wave Distinction>
+<Data Archiving and Distribution, connectedTo, Liquefaction Potential Assessment>
+<Data Archiving and Distribution, locates, Microseismicity Study>
+<Deep Earth Seismology, connectedTo, Geophysical Exploration>
+<Earthquake Detection, international_cooperates, Paleoseismology>
+<Earthquake Early Warning Systems, connectedTo, Epicenter Location>
+<Earthquake Prediction Research, connectedTo, Deep Earth Seismology>
+<Earthquake Prediction Research, connectedTo, Tsunami Warning Systems>
+<Epicenter Location, connectedTo, Subsurface Imaging>
+<Geophysical Exploration, alerts, Induced Seismicity Monitoring>
+<Induced Seismicity Monitoring, connectedTo, Seismic Wave Analysis>
+<Microseismicity Study, connectedTo, Strong Motion Instrumentation>
+<P_Wave or S_Wave Distinction, connectedTo, Data Archiving and Distribution>
+<P_Wave or S_Wave Distinction, connectedTo, Earthquake Early Warning Systems>
+<P_Wave or S_Wave Distinction, connectedTo, Epicenter Location>
+<P_Wave or S_Wave Distinction, connectedTo, Planetary Seismology>
+<P_Wave or S_Wave Distinction, connectedTo, Subsurface Imaging>
+<Paleoseismology, connectedTo, Aftershock Analysis>
+<Paleoseismology, connectedTo, Seismic Instrumentation Maintenance>
+<Paleoseismology, connectedTo, Seismic Inversion>
+<Planetary Seismology, connectedTo, Data Archiving and Distribution>
+<Planetary Seismology, detects, Earthquake Early Warning Systems>
+<Seismic Data Processing, connectedTo, Data Archiving and Distribution>
+<Seismic Data Processing, connectedTo, Earthquake Prediction Research>
+<Seismic Instrumentation Maintenance, connectedTo, Data Archiving and Distribution>
+<Seismic Instrumentation Maintenance, connectedTo, Earthquake Prediction Research>
+<Seismic Instrumentation Maintenance, connectedTo, Seismic Inversion>
+<Seismic Instrumentation Maintenance, risk_assesses, Tsunami Warning Systems>
+<Seismic Inversion, connectedTo, Seismic Data Processing>
+<Seismic Tomography, connectedTo, Paleoseismology>
+<Seismic Tomography, connectedTo, Seismic Instrumentation Maintenance>
+<Seismic Tomography, forecasts, Seismic Inversion>
+<Seismic Wave Analysis, connectedTo, P_Wave or S_Wave Distinction>
+<Strong Motion Instrumentation, connectedTo, Earthquake Detection>
+<Structural Response to Earthquakes, connectedTo, Seismic Instrumentation Maintenance>
+<Structural Response to Earthquakes, connectedTo, Seismic Inversion>
+<Subsurface Imaging, connectedTo, Data Archiving and Distribution>
+<Tsunami Warning Systems, connectedTo, Building Code Development>
+<Tsunami Warning Systems, connectedTo, Data Archiving and Distribution>
diff --git a/test/diagrams/graph_hard/diagrams_32.dot b/test/diagrams/graph_hard/diagrams_32.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c1e9188f11078f448c79ee70c32be8a2f855d15e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_32.dot
@@ -0,0 +1,57 @@
+digraph {
+	rankdir=BT
+	N0 [label="Animal Health Monitoring" color="#6EB76D" fillcolor="#E9F7E8" shape=preparation style=filled]
+	N1 [label="Grain Drying" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N2 [label="Disease Detection" color="#C2B2F0" fillcolor="#EFE6FF" shape=document style=filled]
+	N3 [label="Organic Certification" color="#FF8A65" fillcolor="#FBE9E7" shape=rectangle style=filled]
+	N4 [label="Automated Milking" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N5 [label="Food Processing" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+	N6 [label="Agricultural Research" color="#6EB76D" fillcolor="#E9F7E8" shape=inputoutput style=filled]
+	N7 [label="Hydroponic System Management" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	S0 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Produce Sorting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Produce Sorting"
+		nest0_0 [label="Farm Machinery Operation" color="#FF8A65" fillcolor="#FBE9E7" shape=multipledocuments style=filled]
+		nest0_1 [label="Equipment Repair" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+		nest0_2 [label="Fencing Installation" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+		nest0_3 [label="Weed Removal" color="#6EB76D" fillcolor="#E9F7E8" shape=document style=filled]
+	}
+	subgraph cluster_Drone Scouting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Drone Scouting"
+		nest1_0 [label="Crop Rotation Planning" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+		nest1_1 [label="Seed Sowing" color="#6EB76D" fillcolor="#E9F7E8" shape=rectangle style=filled]
+		nest1_2 [label="Aquaculture Farming" color="#FF8A65" fillcolor="#FBE9E7" shape=predefinedprocess style=filled]
+		nest1_3 [label="Fertilizer Application" color="#FF8A65" fillcolor="#FBE9E7" shape=action style=filled]
+	}
+	N0 -> N1 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed label="harvests" dir=forward]
+	nest0_3 -> N4 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N7 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest1_0 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> N7 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_32.txt b/test/diagrams/graph_hard/diagrams_32.txt
new file mode 100644
index 0000000000000000000000000000000000000000..32ca01087132c2b2153469a404af3b5f38bfbb7c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_32.txt
@@ -0,0 +1,24 @@
+<Agricultural Research, connectedTo, Hydroponic System Management>
+<Animal Health Monitoring, connectedTo, Grain Drying>
+<Aquaculture Farming, connectedTo, Fertilizer Application>
+<Automated Milking, connectedTo, Crop Rotation Planning>
+<Automated Milking, connectedTo, Food Processing>
+<Crop Rotation Planning, connectedTo, Seed Sowing>
+<Disease Detection, connectedTo, Hydroponic System Management>
+<Disease Detection, connectedTo, Organic Certification>
+<Equipment Repair, connectedTo, Fencing Installation>
+<Farm Machinery Operation, connectedTo, Aquaculture Farming>
+<Farm Machinery Operation, connectedTo, Equipment Repair>
+<Farm Machinery Operation, connectedTo, Hydroponic System Management>
+<Fencing Installation, connectedTo, Weed Removal>
+<Fertilizer Application, connectedTo, Hydroponic System Management>
+<Food Processing, connectedTo, Agricultural Research>
+<Grain Drying, connectedTo, Disease Detection>
+<Grain Drying, harvests, Farm Machinery Operation>
+<Hydroponic System Management, connectedTo, Crop Rotation Planning>
+<Organic Certification, connectedTo, Agricultural Research>
+<Organic Certification, connectedTo, Automated Milking>
+<Organic Certification, connectedTo, Food Processing>
+<Organic Certification, connectedTo, Hydroponic System Management>
+<Seed Sowing, connectedTo, Aquaculture Farming>
+<Weed Removal, connectedTo, Automated Milking>
diff --git a/test/diagrams/graph_hard/diagrams_320.dot b/test/diagrams/graph_hard/diagrams_320.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2d3a76cbb0eaac2a3055018f5f9112af28a35ad7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_320.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=TB
+	N0 [label="Seismic Instrumentation Maintenance" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Structural Response to Earthquakes" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N2 [label="Data Archiving and Distribution" color="#00BCD4" fillcolor="#B2EBF2" shape=document style=filled]
+	N3 [label="Earthquake Detection" color="#9FA9E1" fillcolor="#D6D9F0" shape=predefinedprocess style=filled]
+	N4 [label="Building Code Development" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N5 [label="Paleoseismology" color="#388E3C" fillcolor="#C8E6C9" shape=document style=filled]
+	N6 [label="Seismic Hazard Assessment" color="#00BCD4" fillcolor="#B2EBF2" shape=document style=filled]
+	N7 [label="Computational Seismology" color="#388E3C" fillcolor="#C8E6C9" shape=rect style=filled]
+	N8 [label="Aftershock Analysis" color="#388E3C" fillcolor="#C8E6C9" shape=preparation style=filled]
+	N9 [label="Seismic Wave Analysis" color="#388E3C" fillcolor="#C8E6C9" shape=inputoutput style=filled]
+	N10 [label="P_Wave or S_Wave Distinction" color="#00BCD4" fillcolor="#B2EBF2" shape=database style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Emergency Preparedness for Earthquakes {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Emergency Preparedness for Earthquakes"
+		nest0_0 [label="Tectonic Plate Movement Monitoring" color="#9FA9E1" fillcolor="#D6D9F0" shape=database style=filled]
+		nest0_1 [label="Seismic Tomography" color="#388E3C" fillcolor="#C8E6C9" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Subsurface Imaging {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Subsurface Imaging"
+		nest1_0 [label="Earthquake Prediction Research" color="#9FA9E1" fillcolor="#D6D9F0" shape=multipledocuments style=filled]
+		nest1_1 [label="Volcanic Seismology" color="#388E3C" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest0_0 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N8 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N10 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid label="simulates" dir=forward]
+	M1 -> N10 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N5 -> M2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_320.txt b/test/diagrams/graph_hard/diagrams_320.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d6b9e56f2ee47ff03964293eb2e4384fc553c28a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_320.txt
@@ -0,0 +1,26 @@
+<Aftershock Analysis, connectedTo, Seismic Wave Analysis>
+<Building Code Development, connectedTo, Earthquake Prediction Research>
+<Building Code Development, connectedTo, P_Wave or S_Wave Distinction>
+<Building Code Development, connectedTo, Paleoseismology>
+<Building Code Development, connectedTo, Seismic Hazard Assessment>
+<Building Code Development, connectedTo, Seismic Wave Analysis>
+<Building Code Development, connectedTo, Tectonic Plate Movement Monitoring>
+<Computational Seismology, connectedTo, Aftershock Analysis>
+<Data Archiving and Distribution, connectedTo, Aftershock Analysis>
+<Data Archiving and Distribution, connectedTo, Earthquake Detection>
+<Data Archiving and Distribution, connectedTo, Seismic Wave Analysis>
+<Earthquake Detection, connectedTo, Building Code Development>
+<Earthquake Detection, connectedTo, P_Wave or S_Wave Distinction>
+<Earthquake Prediction Research, connectedTo, Volcanic Seismology>
+<Paleoseismology, connectedTo, Seismic Hazard Assessment>
+<Paleoseismology, connectedTo, Seismic Wave Analysis>
+<Seismic Hazard Assessment, connectedTo, Computational Seismology>
+<Seismic Hazard Assessment, connectedTo, P_Wave or S_Wave Distinction>
+<Seismic Instrumentation Maintenance, connectedTo, Structural Response to Earthquakes>
+<Seismic Instrumentation Maintenance, simulates, P_Wave or S_Wave Distinction>
+<Seismic Tomography, connectedTo, Aftershock Analysis>
+<Seismic Wave Analysis, connectedTo, P_Wave or S_Wave Distinction>
+<Structural Response to Earthquakes, connectedTo, Data Archiving and Distribution>
+<Structural Response to Earthquakes, connectedTo, Seismic Wave Analysis>
+<Tectonic Plate Movement Monitoring, connectedTo, Seismic Tomography>
+<Volcanic Seismology, connectedTo, P_Wave or S_Wave Distinction>
diff --git a/test/diagrams/graph_hard/diagrams_321.dot b/test/diagrams/graph_hard/diagrams_321.dot
new file mode 100644
index 0000000000000000000000000000000000000000..844998582e000b1dc9ca1c33675cfc70e0c81cf8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_321.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=RL
+	N0 [label="Seismic Instrumentation Maintenance" color="#388E3C" fillcolor="#C8E6C9" shape=multipledocuments style=filled]
+	N1 [label="Geophysical Exploration" color="#388E3C" fillcolor="#C8E6C9" shape=multipledocuments style=filled]
+	N2 [label="Subsurface Imaging" color="#388E3C" fillcolor="#C8E6C9" shape=parallelogram style=filled]
+	N3 [label="Seismic Noise Analysis" color="#388E3C" fillcolor="#C8E6C9" shape=predefinedprocess style=filled]
+	N4 [label="Tsunami Warning Systems" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N5 [label="Computational Seismology" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N6 [label="Seismic Data Processing" color="#6EB76D" fillcolor="#E9F7E8" shape=rect style=filled]
+	N7 [label="Earth Structure Imaging" color="#388E3C" fillcolor="#C8E6C9" shape=action style=filled]
+	N8 [label="Tectonic Plate Movement Monitoring" color="#388E3C" fillcolor="#C8E6C9" shape=parallelogram style=filled]
+	N9 [label="Microseismicity Study" color="#388E3C" fillcolor="#C8E6C9" shape=action style=filled]
+	N10 [label="Magnitude Determination" color="#6EB76D" fillcolor="#E9F7E8" shape=database style=filled]
+	N11 [label="Strong Motion Instrumentation" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N12 [label="Deep Earth Seismology" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N13 [label="Ground Motion Prediction" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	S0 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Earthquake Prediction Research {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Earthquake Prediction Research"
+		nest0_0 [label="Epicenter Location" color="#6EB76D" fillcolor="#E9F7E8" shape=action style=filled]
+		nest0_1 [label="Paleoseismology" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Seismic Inversion {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Seismic Inversion"
+		nest1_0 [label="Aftershock Analysis" color="#388E3C" fillcolor="#C8E6C9" shape=predefinedprocess style=filled]
+		nest1_1 [label="Seismic Risk Mitigation" color="#A188DB" fillcolor="#DED7F0" shape=multipledocuments style=filled]
+		nest1_2 [label="Seismic Tomography" color="#6EB76D" fillcolor="#E9F7E8" shape=diamond style=filled]
+		nest1_3 [label="Seismic Wave Analysis" color="#388E3C" fillcolor="#C8E6C9" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#388E3C" penwidth=1.5 style=dashed label="ground_motion" dir=forward]
+	nest0_1 -> N2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N9 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N3 -> S1 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N8 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#6EB76D" penwidth=1.5 style=solid label="interprets" dir=forward]
+	M1 -> N8 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#A188DB" penwidth=1.5 style=solid label="improves_accuracy" dir=forward]
+	M2 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_321.txt b/test/diagrams/graph_hard/diagrams_321.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d978e9f2ac94d77d72ec85f1e864d2dac7a35429
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_321.txt
@@ -0,0 +1,31 @@
+<Aftershock Analysis, connectedTo, Seismic Risk Mitigation>
+<Computational Seismology, connectedTo, Seismic Data Processing>
+<Computational Seismology, connectedTo, Tectonic Plate Movement Monitoring>
+<Deep Earth Seismology, connectedTo, Ground Motion Prediction>
+<Earth Structure Imaging, connectedTo, Tectonic Plate Movement Monitoring>
+<Epicenter Location, connectedTo, Paleoseismology>
+<Geophysical Exploration, connectedTo, Aftershock Analysis>
+<Geophysical Exploration, connectedTo, Subsurface Imaging>
+<Geophysical Exploration, connectedTo, Tectonic Plate Movement Monitoring>
+<Geophysical Exploration, improves_accuracy, Strong Motion Instrumentation>
+<Magnitude Determination, connectedTo, Strong Motion Instrumentation>
+<Microseismicity Study, connectedTo, Magnitude Determination>
+<Paleoseismology, connectedTo, Subsurface Imaging>
+<Seismic Data Processing, connectedTo, Earth Structure Imaging>
+<Seismic Data Processing, ground_motion, Epicenter Location>
+<Seismic Instrumentation Maintenance, connectedTo, Geophysical Exploration>
+<Seismic Noise Analysis, connectedTo, Computational Seismology>
+<Seismic Noise Analysis, connectedTo, Deep Earth Seismology>
+<Seismic Noise Analysis, connectedTo, Earth Structure Imaging>
+<Seismic Noise Analysis, connectedTo, Microseismicity Study>
+<Seismic Noise Analysis, connectedTo, Strong Motion Instrumentation>
+<Seismic Noise Analysis, connectedTo, Tsunami Warning Systems>
+<Seismic Risk Mitigation, connectedTo, Seismic Tomography>
+<Seismic Tomography, connectedTo, Seismic Wave Analysis>
+<Seismic Wave Analysis, connectedTo, Microseismicity Study>
+<Strong Motion Instrumentation, connectedTo, Deep Earth Seismology>
+<Subsurface Imaging, connectedTo, Seismic Noise Analysis>
+<Tectonic Plate Movement Monitoring, connectedTo, Microseismicity Study>
+<Tectonic Plate Movement Monitoring, connectedTo, Strong Motion Instrumentation>
+<Tsunami Warning Systems, connectedTo, Computational Seismology>
+<Tsunami Warning Systems, interprets, Tectonic Plate Movement Monitoring>
diff --git a/test/diagrams/graph_hard/diagrams_323.dot b/test/diagrams/graph_hard/diagrams_323.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ba6929688b0e4a83b606bf46f7338e0512a3dd1b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_323.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=RL
+	N0 [label="Gene Annotation" color="#FF8A65" fillcolor="#FBE9E7" shape=document style=filled]
+	N1 [label="Synthetic Genomics" color="#66BB6A" fillcolor="#E8F5E9" shape=action style=filled]
+	N2 [label="Data Privacy in Genomics" color="#66BB6A" fillcolor="#E8F5E9" shape=document style=filled]
+	N3 [label="Gene Expression Profiling" color="#66BB6A" fillcolor="#E8F5E9" shape=rect style=filled]
+	N4 [label="Pharmacogenomics" color="#FFF176" fillcolor="#FFFDE7" shape=database style=filled]
+	N5 [label="Personalized Medicine" color="#FFF176" fillcolor="#FFFDE7" shape=vnode_shape style=filled]
+	N6 [label="Cloning Technologies" color="#FFF176" fillcolor="#FFFDE7" shape=predefinedprocess style=filled]
+	N7 [label="Gene Therapy Development" color="#FFF176" fillcolor="#FFFDE7" shape=predefinedprocess style=filled]
+	N8 [label="Genomic Editing" color="#FFF176" fillcolor="#FFFDE7" shape=vnode_shape style=filled]
+	N9 [label="Social Implications" color="#FF8A65" fillcolor="#FBE9E7" shape=inputoutput style=filled]
+	N10 [label="Spatial Genomics" color="#66BB6A" fillcolor="#E8F5E9" shape=inputoutput style=filled]
+	N11 [label="Transcriptomics" color="#FF8A65" fillcolor="#FBE9E7" shape=vnode_shape style=filled]
+	N12 [label="Rare Disease Genomics" color="#66BB6A" fillcolor="#E8F5E9" shape=action style=filled]
+	N13 [label="Long_Read Sequencing" color="#FFF176" fillcolor="#FFFDE7" shape=rectangle style=filled]
+	N14 [label="Genome_Wide Association Studies" color="#66BB6A" fillcolor="#E8F5E9" shape=vnode_shape style=filled]
+	S0 [label="" color="#66BB6A" fillcolor="#E8F5E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFF176" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#66BB6A" fillcolor="#E8F5E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FF8A65" fillcolor="#FBE9E7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Population Genomics {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Population Genomics"
+		nest0_0 [label="Genomic Data Visualization" color="#FFF176" fillcolor="#FFFDE7" shape=database style=filled]
+		nest0_1 [label="Next_Generation Sequencing" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+		nest0_2 [label="Methylation Analysis" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	}
+	subgraph cluster_DNA Sequencing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="DNA Sequencing"
+		nest1_0 [label="Functional Genomics" color="#66BB6A" fillcolor="#E8F5E9" shape=inputoutput style=filled]
+		nest1_1 [label="Comparative Genomics" color="#FF8A65" fillcolor="#FBE9E7" shape=action style=filled]
+		nest1_2 [label="Metabolomics" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N8 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N11 [color="#66BB6A" penwidth=1.5 style=solid label="diagnoses" dir=forward]
+	N8 -> S0 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#000000" penwidth=1.5 style=dashed label="stores_data" dir=forward]
+	N4 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	M0 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N4 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_323.txt b/test/diagrams/graph_hard/diagrams_323.txt
new file mode 100644
index 0000000000000000000000000000000000000000..aebb8504ac66adcf19088ee81ba0d49b7b360900
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_323.txt
@@ -0,0 +1,33 @@
+<Cloning Technologies, connectedTo, Gene Therapy Development>
+<Comparative Genomics, connectedTo, Metabolomics>
+<Data Privacy in Genomics, connectedTo, Gene Expression Profiling>
+<Data Privacy in Genomics, connectedTo, Pharmacogenomics>
+<Functional Genomics, connectedTo, Comparative Genomics>
+<Gene Annotation, connectedTo, Gene Expression Profiling>
+<Gene Annotation, connectedTo, Pharmacogenomics>
+<Gene Annotation, connectedTo, Synthetic Genomics>
+<Gene Expression Profiling, connectedTo, Pharmacogenomics>
+<Gene Therapy Development, connectedTo, Genomic Data Visualization>
+<Gene Therapy Development, connectedTo, Genomic Editing>
+<Genomic Data Visualization, connectedTo, Next_Generation Sequencing>
+<Genomic Editing, connectedTo, Rare Disease Genomics>
+<Genomic Editing, connectedTo, Social Implications>
+<Genomic Editing, connectedTo, Transcriptomics>
+<Genomic Editing, stores_data, Genome_Wide Association Studies>
+<Long_Read Sequencing, connectedTo, Genome_Wide Association Studies>
+<Metabolomics, diagnoses, Transcriptomics>
+<Methylation Analysis, connectedTo, Genomic Editing>
+<Next_Generation Sequencing, connectedTo, Methylation Analysis>
+<Personalized Medicine, connectedTo, Cloning Technologies>
+<Pharmacogenomics, connectedTo, Cloning Technologies>
+<Pharmacogenomics, connectedTo, Functional Genomics>
+<Pharmacogenomics, connectedTo, Personalized Medicine>
+<Pharmacogenomics, connectedTo, Rare Disease Genomics>
+<Pharmacogenomics, connectedTo, Spatial Genomics>
+<Rare Disease Genomics, connectedTo, Long_Read Sequencing>
+<Social Implications, connectedTo, Spatial Genomics>
+<Spatial Genomics, connectedTo, Transcriptomics>
+<Synthetic Genomics, connectedTo, Data Privacy in Genomics>
+<Synthetic Genomics, connectedTo, Gene Expression Profiling>
+<Synthetic Genomics, connectedTo, Pharmacogenomics>
+<Transcriptomics, connectedTo, Rare Disease Genomics>
diff --git a/test/diagrams/graph_hard/diagrams_324.dot b/test/diagrams/graph_hard/diagrams_324.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d159a1f3132ded56ad4e023b59b0d054aff3addf
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_324.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=BT
+	N0 [label="Social Implications" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N1 [label="Genome Assembly" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N2 [label="Genetic Counseling" color="#64B5F6" fillcolor="#E3F2FD" shape=preparation style=filled]
+	N3 [label="Long_Read Sequencing" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N4 [label="Functional Genomics" color="#64B5F6" fillcolor="#E3F2FD" shape=predefinedprocess style=filled]
+	N5 [label="Proteomics" color="#AB47BC" fillcolor="#F3E5F5" shape=rect style=filled]
+	N6 [label="Structural Genomics" color="#4DB6AC" fillcolor="#E0F2F1" shape=rectangle style=filled]
+	N7 [label="Methylation Analysis" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	S0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AB47BC" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AB47BC" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#AB47BC" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Gene Annotation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Gene Annotation"
+		nest0_0 [label="Variant Calling" color="#AB47BC" fillcolor="#F3E5F5" shape=database style=filled]
+		nest0_1 [label="Rare Disease Genomics" color="#64B5F6" fillcolor="#E3F2FD" shape=preparation style=filled]
+		nest0_2 [label="Bioinformatics Pipeline Development" color="#4DB6AC" fillcolor="#E0F2F1" shape=rect style=filled]
+		nest0_3 [label="Genomic Data Analysis" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	}
+	subgraph cluster_Pharmacogenomics {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Pharmacogenomics"
+		nest1_0 [label="Spatial Genomics" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+		nest1_1 [label="DNA Sequencing" color="#4DB6AC" fillcolor="#E0F2F1" shape=inputoutput style=filled]
+		nest1_2 [label="Cancer Genomics" color="#4DB6AC" fillcolor="#E0F2F1" shape=action style=filled]
+	}
+	N0 -> N1 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N6 [color="#000000" penwidth=1.5 style=dashed label="tools_creates" dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed label="diagnoses" dir=forward]
+	nest1_1 -> nest1_2 [color="#64B5F6" penwidth=1.5 style=solid label="diseases_links" dir=forward]
+	N6 -> nest1_0 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N1 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N3 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N6 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N6 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N3 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_324.txt b/test/diagrams/graph_hard/diagrams_324.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5a70e6f1a4e24ef2c9c66c3ac45c72867357aa8c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_324.txt
@@ -0,0 +1,30 @@
+<Bioinformatics Pipeline Development, connectedTo, Genomic Data Analysis>
+<Cancer Genomics, connectedTo, Genome Assembly>
+<Cancer Genomics, partOf, Cancer Genomics>
+<DNA Sequencing, diseases_links, Cancer Genomics>
+<DNA Sequencing, partOf, DNA Sequencing>
+<Functional Genomics, connectedTo, Proteomics>
+<Functional Genomics, connectedTo, Structural Genomics>
+<Genetic Counseling, connectedTo, Long_Read Sequencing>
+<Genetic Counseling, connectedTo, Structural Genomics>
+<Genome Assembly, connectedTo, Genetic Counseling>
+<Genome Assembly, connectedTo, Long_Read Sequencing>
+<Genome Assembly, connectedTo, Methylation Analysis>
+<Genome Assembly, connectedTo, Proteomics>
+<Genome Assembly, connectedTo, Structural Genomics>
+<Genomic Data Analysis, tools_creates, Structural Genomics>
+<Long_Read Sequencing, connectedTo, Functional Genomics>
+<Long_Read Sequencing, connectedTo, Methylation Analysis>
+<Long_Read Sequencing, connectedTo, Proteomics>
+<Long_Read Sequencing, connectedTo, Structural Genomics>
+<Proteomics, connectedTo, Structural Genomics>
+<Proteomics, connectedTo, Variant Calling>
+<Rare Disease Genomics, connectedTo, Bioinformatics Pipeline Development>
+<Social Implications, connectedTo, Genome Assembly>
+<Social Implications, connectedTo, Long_Read Sequencing>
+<Social Implications, connectedTo, Structural Genomics>
+<Spatial Genomics, diagnoses, DNA Sequencing>
+<Spatial Genomics, partOf, Spatial Genomics>
+<Structural Genomics, connectedTo, Methylation Analysis>
+<Structural Genomics, connectedTo, Spatial Genomics>
+<Variant Calling, connectedTo, Rare Disease Genomics>
diff --git a/test/diagrams/graph_hard/diagrams_325.dot b/test/diagrams/graph_hard/diagrams_325.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9c0bc194f809a4fd128118dff570490770852efa
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_325.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Voice Search Optimization" color="#B0C5CD" fillcolor="#DFE7EB" shape=predefinedprocess style=filled]
+	N1 [label="Language Modeling" color="#A1887F" fillcolor="#EFEBE9" shape=inputoutput style=filled]
+	N2 [label="Speech Data Annotation" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+	N3 [label="Voice Activity Detection" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N4 [label="Speech Emotion Recognition" color="#A1887F" fillcolor="#EFEBE9" shape=parallelogram style=filled]
+	N5 [label="Dialect Adaptation" color="#A1887F" fillcolor="#EFEBE9" shape=inputoutput style=filled]
+	N6 [label="Voice Assistant Development" color="#A1887F" fillcolor="#EFEBE9" shape=diamond style=filled]
+	N7 [label="Acoustic Modeling" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N8 [label="Phonetic Transcription" color="#7E57C2" fillcolor="#D1C4E9" shape=preparation style=filled]
+	N9 [label="Call Center Automation" color="#A1887F" fillcolor="#EFEBE9" shape=preparation style=filled]
+	N10 [label="Speaker Diarization" color="#B0C5CD" fillcolor="#DFE7EB" shape=database style=filled]
+	N11 [label="Voice User Interface Design" color="#A1887F" fillcolor="#EFEBE9" shape=rectangle style=filled]
+	N12 [label="Speech_to_Text Conversion" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N13 [label="Legal Transcription" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+	N14 [label="Speaker Identification" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N15 [label="Accent Recognition" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+	N16 [label="Natural Language Understanding" color="#B0C5CD" fillcolor="#DFE7EB" shape=vnode_shape style=filled]
+	N17 [label="Feature Extraction" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N18 [label="Children's Speech Recognition" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+	S0 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Robust Speech Recognition {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Robust Speech Recognition"
+		nest0_0 [label="Contextual Understanding" color="#A1887F" fillcolor="#EFEBE9" shape=document style=filled]
+		nest0_1 [label="Disordered Speech Recognition" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+		nest0_2 [label="Text_to_Speech Synthesis" color="#B0C5CD" fillcolor="#DFE7EB" shape=rectangle style=filled]
+	}
+	subgraph cluster_Emotion Recognition from Voice {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Emotion Recognition from Voice"
+		nest1_0 [label="Speech Analytics" color="#7E57C2" fillcolor="#D1C4E9" shape=vnode_shape style=filled]
+		nest1_1 [label="Multimodal Speech Processing" color="#A1887F" fillcolor="#EFEBE9" shape=action style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid label="converts" dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N17 -> N18 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N16 -> nest1_0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N2 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N7 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#A1887F" penwidth=1.5 style=solid label="transcribes" dir=forward]
+	S0 -> N14 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N13 -> S1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S1 -> N18 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N17 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N15 -> S2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S2 -> N17 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	S2 -> N18 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N10 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_325.txt b/test/diagrams/graph_hard/diagrams_325.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bee724608df1be57eae7387ad6b5dc1b08b33f34
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_325.txt
@@ -0,0 +1,35 @@
+<Accent Recognition, connectedTo, Children's Speech Recognition>
+<Accent Recognition, connectedTo, Feature Extraction>
+<Accent Recognition, connectedTo, Natural Language Understanding>
+<Acoustic Modeling, connectedTo, Phonetic Transcription>
+<Acoustic Modeling, connectedTo, Speaker Identification>
+<Acoustic Modeling, connectedTo, Voice User Interface Design>
+<Acoustic Modeling, transcribes, Speaker Diarization>
+<Call Center Automation, connectedTo, Speaker Diarization>
+<Contextual Understanding, connectedTo, Disordered Speech Recognition>
+<Dialect Adaptation, connectedTo, Contextual Understanding>
+<Dialect Adaptation, connectedTo, Voice Assistant Development>
+<Disordered Speech Recognition, connectedTo, Text_to_Speech Synthesis>
+<Feature Extraction, connectedTo, Children's Speech Recognition>
+<Language Modeling, connectedTo, Speaker Diarization>
+<Language Modeling, connectedTo, Speech Data Annotation>
+<Legal Transcription, connectedTo, Children's Speech Recognition>
+<Legal Transcription, connectedTo, Feature Extraction>
+<Legal Transcription, connectedTo, Natural Language Understanding>
+<Legal Transcription, connectedTo, Speaker Identification>
+<Multimodal Speech Processing, connectedTo, Speech Data Annotation>
+<Natural Language Understanding, connectedTo, Feature Extraction>
+<Natural Language Understanding, connectedTo, Speech Analytics>
+<Phonetic Transcription, connectedTo, Call Center Automation>
+<Speaker Diarization, connectedTo, Voice User Interface Design>
+<Speaker Identification, connectedTo, Accent Recognition>
+<Speech Analytics, connectedTo, Multimodal Speech Processing>
+<Speech Data Annotation, connectedTo, Voice Activity Detection>
+<Speech Emotion Recognition, connectedTo, Dialect Adaptation>
+<Speech Emotion Recognition, connectedTo, Speaker Diarization>
+<Speech_to_Text Conversion, connectedTo, Legal Transcription>
+<Text_to_Speech Synthesis, connectedTo, Language Modeling>
+<Voice Activity Detection, connectedTo, Speech Emotion Recognition>
+<Voice Assistant Development, connectedTo, Acoustic Modeling>
+<Voice Search Optimization, connectedTo, Language Modeling>
+<Voice User Interface Design, converts, Speech_to_Text Conversion>
diff --git a/test/diagrams/graph_hard/diagrams_326.dot b/test/diagrams/graph_hard/diagrams_326.dot
new file mode 100644
index 0000000000000000000000000000000000000000..229313a7ed3fc83ebe82afa9bab63451ea4ee636
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_326.dot
@@ -0,0 +1,90 @@
+digraph {
+	rankdir=TB
+	N0 [label="Speech_to_Text Conversion" color="#EAEFA5" fillcolor="#FDFCEB" shape=rectangle style=filled]
+	N1 [label="Noise Reduction" color="#EAEFA5" fillcolor="#FDFCEB" shape=multipledocuments style=filled]
+	N2 [label="Linguistic Analysis" color="#FF8A65" fillcolor="#FBE9E7" shape=inputoutput style=filled]
+	N3 [label="Natural Language Understanding" color="#EAEFA5" fillcolor="#FDFCEB" shape=document style=filled]
+	N4 [label="Cross_Lingual Speech Recognition" color="#FFCC80" fillcolor="#FFF0CC" shape=action style=filled]
+	N5 [label="Security Authentication" color="#EAEFA5" fillcolor="#FDFCEB" shape=parallelogram style=filled]
+	N6 [label="Speaker Identification" color="#FFCC80" fillcolor="#FFF0CC" shape=predefinedprocess style=filled]
+	N7 [label="Acoustic Modeling" color="#EAEFA5" fillcolor="#FDFCEB" shape=predefinedprocess style=filled]
+	N8 [label="Phonetic Transcription" color="#EAEFA5" fillcolor="#FDFCEB" shape=vnode_shape style=filled]
+	N9 [label="Speaker Diarization" color="#EAEFA5" fillcolor="#FDFCEB" shape=rect style=filled]
+	N10 [label="Speech Data Annotation" color="#EAEFA5" fillcolor="#FDFCEB" shape=rect style=filled]
+	N11 [label="Disordered Speech Recognition" color="#FFCC80" fillcolor="#FFF0CC" shape=database style=filled]
+	N12 [label="Command and Control" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N13 [label="Medical Transcription" color="#EAEFA5" fillcolor="#FDFCEB" shape=predefinedprocess style=filled]
+	N14 [label="Speech Analytics" color="#EAEFA5" fillcolor="#FDFCEB" shape=hexagon style=filled]
+	N15 [label="Voice Biometrics" color="#EAEFA5" fillcolor="#FDFCEB" shape=vnode_shape style=filled]
+	N16 [label="Emotion Recognition from Voice" color="#FF8A65" fillcolor="#FBE9E7" shape=action style=filled]
+	N17 [label="Real_Time Captioning" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FF8A65" fillcolor="#FBE9E7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FF8A65" fillcolor="#FBE9E7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Text_to_Speech Synthesis {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Text_to_Speech Synthesis"
+		nest0_0 [label="Legal Transcription" color="#EAEFA5" fillcolor="#FDFCEB" shape=hexagon style=filled]
+		nest0_1 [label="Children's Speech Recognition" color="#FFCC80" fillcolor="#FFF0CC" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Voice Search Optimization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Voice Search Optimization"
+		nest1_0 [label="Multimodal Speech Processing" color="#EAEFA5" fillcolor="#FDFCEB" shape=document style=filled]
+		nest1_1 [label="Voice User Interface Design" color="#FF8A65" fillcolor="#FBE9E7" shape=database style=filled]
+		nest1_2 [label="Contextual Understanding" color="#FFCC80" fillcolor="#FFF0CC" shape=action style=filled]
+		nest1_3 [label="Feature Extraction" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	}
+	N0 -> N1 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFCC80" penwidth=1.5 style=solid label="interprets" dir=forward]
+	N7 -> N8 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#FFCC80" penwidth=1.5 style=solid label="builds" dir=forward]
+	N12 -> N13 [color="#FFCC80" penwidth=1.5 style=solid label="monitors" dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#FF8A65" penwidth=1.5 style=dashed label="generates" dir=forward]
+	N16 -> N17 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N15 -> nest0_0 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N2 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N11 -> nest1_0 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N7 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=solid label="evaluates" dir=forward]
+	S0 -> N15 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N9 -> S1 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> M0 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#FFCC80" penwidth=1.5 style=dashed label="inputs" dir=forward]
+	N4 -> M0 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N15 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N11 -> M1 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#FF8A65" penwidth=1.5 style=dashed label="acoustic_models" dir=forward]
+	N1 -> M1 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	M1 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N6 -> M2 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	M2 -> N8 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_326.txt b/test/diagrams/graph_hard/diagrams_326.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4f4259739fe4bf77ded10f9c2c1ab674ff9f7d3c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_326.txt
@@ -0,0 +1,43 @@
+<Acoustic Modeling, connectedTo, Phonetic Transcription>
+<Children's Speech Recognition, connectedTo, Linguistic Analysis>
+<Command and Control, connectedTo, Voice Biometrics>
+<Command and Control, monitors, Medical Transcription>
+<Contextual Understanding, connectedTo, Feature Extraction>
+<Cross_Lingual Speech Recognition, connectedTo, Security Authentication>
+<Cross_Lingual Speech Recognition, connectedTo, Voice Biometrics>
+<Disordered Speech Recognition, builds, Command and Control>
+<Disordered Speech Recognition, connectedTo, Medical Transcription>
+<Disordered Speech Recognition, connectedTo, Multimodal Speech Processing>
+<Emotion Recognition from Voice, connectedTo, Real_Time Captioning>
+<Feature Extraction, connectedTo, Acoustic Modeling>
+<Legal Transcription, connectedTo, Children's Speech Recognition>
+<Linguistic Analysis, connectedTo, Medical Transcription>
+<Linguistic Analysis, connectedTo, Natural Language Understanding>
+<Linguistic Analysis, connectedTo, Phonetic Transcription>
+<Linguistic Analysis, connectedTo, Speech Analytics>
+<Linguistic Analysis, connectedTo, Voice Biometrics>
+<Linguistic Analysis, evaluates, Phonetic Transcription>
+<Medical Transcription, connectedTo, Speech Analytics>
+<Multimodal Speech Processing, connectedTo, Voice User Interface Design>
+<Natural Language Understanding, acoustic_models, Medical Transcription>
+<Natural Language Understanding, connectedTo, Cross_Lingual Speech Recognition>
+<Natural Language Understanding, inputs, Voice Biometrics>
+<Noise Reduction, connectedTo, Linguistic Analysis>
+<Noise Reduction, connectedTo, Medical Transcription>
+<Noise Reduction, connectedTo, Phonetic Transcription>
+<Phonetic Transcription, connectedTo, Speaker Diarization>
+<Security Authentication, connectedTo, Speaker Identification>
+<Security Authentication, connectedTo, Voice Biometrics>
+<Speaker Diarization, connectedTo, Command and Control>
+<Speaker Diarization, connectedTo, Disordered Speech Recognition>
+<Speaker Diarization, connectedTo, Medical Transcription>
+<Speaker Diarization, connectedTo, Speech Data Annotation>
+<Speaker Identification, connectedTo, Medical Transcription>
+<Speaker Identification, connectedTo, Phonetic Transcription>
+<Speaker Identification, interprets, Acoustic Modeling>
+<Speech Analytics, connectedTo, Voice Biometrics>
+<Speech Data Annotation, connectedTo, Disordered Speech Recognition>
+<Speech_to_Text Conversion, connectedTo, Noise Reduction>
+<Voice Biometrics, connectedTo, Legal Transcription>
+<Voice Biometrics, generates, Emotion Recognition from Voice>
+<Voice User Interface Design, connectedTo, Contextual Understanding>
diff --git a/test/diagrams/graph_hard/diagrams_327.dot b/test/diagrams/graph_hard/diagrams_327.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d7607152c3a1b17519dbca74675b24026c4a47f1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_327.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=RL
+	N0 [label="Multimodal Speech Processing" color="#FF8A65" fillcolor="#FBE9E7" shape=multipledocuments style=filled]
+	N1 [label="Natural Language Understanding" color="#388E3C" fillcolor="#F1F8E9" shape=database style=filled]
+	N2 [label="Speech Data Annotation" color="#FF8A65" fillcolor="#FBE9E7" shape=document style=filled]
+	N3 [label="Acoustic Modeling" color="#388E3C" fillcolor="#F1F8E9" shape=predefinedprocess style=filled]
+	N4 [label="Cross_Lingual Speech Recognition" color="#00BCD4" fillcolor="#E0F7FA" shape=document style=filled]
+	N5 [label="Keyword Spotting" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+	N6 [label="Dialect Adaptation" color="#FF8A65" fillcolor="#FBE9E7" shape=rectangle style=filled]
+	N7 [label="Accent Recognition" color="#FF8A65" fillcolor="#FBE9E7" shape=predefinedprocess style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Robust Speech Recognition {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Robust Speech Recognition"
+		nest0_0 [label="Phonetic Transcription" color="#FF8A65" fillcolor="#FBE9E7" shape=rect style=filled]
+		nest0_1 [label="Emotion Recognition from Voice" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+		nest0_2 [label="Call Center Automation" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+		nest0_3 [label="Prosody Analysis" color="#388E3C" fillcolor="#F1F8E9" shape=document style=filled]
+	}
+	subgraph cluster_Cloud_based Speech Services {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Cloud_based Speech Services"
+		nest1_0 [label="Voice User Interface Design" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+		nest1_1 [label="Children's Speech Recognition" color="#388E3C" fillcolor="#F1F8E9" shape=document style=filled]
+	}
+	N0 -> N1 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N6 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest1_0 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N7 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N6 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_327.txt b/test/diagrams/graph_hard/diagrams_327.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c3b7410c5b78303a7bfb42ec6cc7f9b6c863f505
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_327.txt
@@ -0,0 +1,23 @@
+<Acoustic Modeling, connectedTo, Accent Recognition>
+<Acoustic Modeling, connectedTo, Cross_Lingual Speech Recognition>
+<Acoustic Modeling, connectedTo, Dialect Adaptation>
+<Acoustic Modeling, connectedTo, Keyword Spotting>
+<Call Center Automation, connectedTo, Prosody Analysis>
+<Children's Speech Recognition, connectedTo, Accent Recognition>
+<Cross_Lingual Speech Recognition, connectedTo, Accent Recognition>
+<Cross_Lingual Speech Recognition, connectedTo, Dialect Adaptation>
+<Cross_Lingual Speech Recognition, connectedTo, Keyword Spotting>
+<Dialect Adaptation, connectedTo, Accent Recognition>
+<Emotion Recognition from Voice, connectedTo, Call Center Automation>
+<Keyword Spotting, connectedTo, Dialect Adaptation>
+<Keyword Spotting, connectedTo, Voice User Interface Design>
+<Multimodal Speech Processing, connectedTo, Natural Language Understanding>
+<Natural Language Understanding, connectedTo, Accent Recognition>
+<Natural Language Understanding, connectedTo, Acoustic Modeling>
+<Natural Language Understanding, connectedTo, Dialect Adaptation>
+<Natural Language Understanding, connectedTo, Speech Data Annotation>
+<Phonetic Transcription, connectedTo, Emotion Recognition from Voice>
+<Prosody Analysis, connectedTo, Dialect Adaptation>
+<Speech Data Annotation, connectedTo, Acoustic Modeling>
+<Speech Data Annotation, connectedTo, Phonetic Transcription>
+<Voice User Interface Design, connectedTo, Children's Speech Recognition>
diff --git a/test/diagrams/graph_hard/diagrams_328.dot b/test/diagrams/graph_hard/diagrams_328.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e4d98ccd6f8213bf83b0e53bb7485f461af34b78
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_328.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=BT
+	N0 [label="Financial Text Analysis" color="#A1887F" fillcolor="#EFEBE9" shape=action style=filled]
+	N1 [label="Concept Extraction" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N2 [label="Patent Analysis" color="#B0C5CD" fillcolor="#DFE7EB" shape=predefinedprocess style=filled]
+	N3 [label="Information Extraction" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N4 [label="Corpus Creation" color="#CD8FF2" fillcolor="#ECCFF5" shape=multipledocuments style=filled]
+	N5 [label="Biomedical Text Mining" color="#CD8FF2" fillcolor="#ECCFF5" shape=rectangle style=filled]
+	N6 [label="Text Preprocessing" color="#B0C5CD" fillcolor="#DFE7EB" shape=predefinedprocess style=filled]
+	N7 [label="Text Visualization" color="#CD8FF2" fillcolor="#ECCFF5" shape=action style=filled]
+	N8 [label="Author Attribution" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N9 [label="Regular Expressions for Text" color="#B0C5CD" fillcolor="#DFE7EB" shape=preparation style=filled]
+	N10 [label="Topic Modeling" color="#CD8FF2" fillcolor="#ECCFF5" shape=rectangle style=filled]
+	N11 [label="News Article Analysis" color="#B0C5CD" fillcolor="#DFE7EB" shape=database style=filled]
+	S0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Machine Learning for Text Mining {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Machine Learning for Text Mining"
+		nest0_0 [label="Sentiment Analysis" color="#A1887F" fillcolor="#EFEBE9" shape=vnode_shape style=filled]
+		nest0_1 [label="Relationship Extraction" color="#A1887F" fillcolor="#EFEBE9" shape=database style=filled]
+		nest0_2 [label="Text Clustering" color="#A1887F" fillcolor="#EFEBE9" shape=diamond style=filled]
+	}
+	subgraph cluster_Named Entity Recognition {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Named Entity Recognition"
+		nest1_0 [label="Social Media Text Analysis" color="#CD8FF2" fillcolor="#ECCFF5" shape=rect style=filled]
+		nest1_1 [label="Customer Feedback Analysis" color="#A1887F" fillcolor="#EFEBE9" shape=predefinedprocess style=filled]
+		nest1_2 [label="Keyword Extraction" color="#A1887F" fillcolor="#EFEBE9" shape=preparation style=filled]
+		nest1_3 [label="Legal Document Analysis" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed label="trends" dir=forward]
+	N5 -> N6 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#B0C5CD" penwidth=1.5 style=dashed label="alerts" dir=forward]
+	N9 -> N10 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest0_0 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N8 [color="#B0C5CD" penwidth=1.5 style=solid label="classifies" dir=forward]
+	nest1_0 -> nest1_1 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N3 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S1 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N6 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_328.txt b/test/diagrams/graph_hard/diagrams_328.txt
new file mode 100644
index 0000000000000000000000000000000000000000..10fa02c5f6b9e97b198ff2f2133dc6779e9302a8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_328.txt
@@ -0,0 +1,26 @@
+<Author Attribution, alerts, Regular Expressions for Text>
+<Author Attribution, connectedTo, Social Media Text Analysis>
+<Biomedical Text Mining, connectedTo, Text Preprocessing>
+<Concept Extraction, connectedTo, Biomedical Text Mining>
+<Concept Extraction, connectedTo, Information Extraction>
+<Concept Extraction, connectedTo, Patent Analysis>
+<Concept Extraction, connectedTo, Text Preprocessing>
+<Corpus Creation, connectedTo, Text Preprocessing>
+<Corpus Creation, trends, Biomedical Text Mining>
+<Customer Feedback Analysis, connectedTo, Keyword Extraction>
+<Financial Text Analysis, connectedTo, Concept Extraction>
+<Financial Text Analysis, connectedTo, Corpus Creation>
+<Financial Text Analysis, connectedTo, Text Visualization>
+<Information Extraction, connectedTo, Corpus Creation>
+<Keyword Extraction, connectedTo, Legal Document Analysis>
+<Legal Document Analysis, connectedTo, Text Visualization>
+<Patent Analysis, connectedTo, Information Extraction>
+<Regular Expressions for Text, connectedTo, Sentiment Analysis>
+<Regular Expressions for Text, connectedTo, Topic Modeling>
+<Relationship Extraction, connectedTo, Text Clustering>
+<Sentiment Analysis, connectedTo, Relationship Extraction>
+<Social Media Text Analysis, connectedTo, Customer Feedback Analysis>
+<Text Clustering, classifies, Author Attribution>
+<Text Preprocessing, connectedTo, Text Visualization>
+<Text Visualization, connectedTo, Author Attribution>
+<Topic Modeling, connectedTo, News Article Analysis>
diff --git a/test/diagrams/graph_hard/diagrams_329.dot b/test/diagrams/graph_hard/diagrams_329.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c4ee372908dafc75f8adfe19c9e7f836b0915691
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_329.dot
@@ -0,0 +1,83 @@
+digraph {
+	rankdir=RL
+	N0 [label="Keyword Extraction" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N1 [label="Automated Content Tagging" color="#D3EB9F" fillcolor="#F8FDD3" shape=parallelogram style=filled]
+	N2 [label="Part_of_Speech Tagging" color="#D3EB9F" fillcolor="#F8FDD3" shape=database style=filled]
+	N3 [label="Lemmatization or Stemming" color="#66BB6A" fillcolor="#E8F5E9" shape=predefinedprocess style=filled]
+	N4 [label="Knowledge Graph Construction" color="#66BB6A" fillcolor="#E8F5E9" shape=multipledocuments style=filled]
+	N5 [label="Document Summarization" color="#66BB6A" fillcolor="#E8F5E9" shape=parallelogram style=filled]
+	N6 [label="Machine Learning for Text Mining" color="#FFDA4E" fillcolor="#FFE88D" shape=rectangle style=filled]
+	N7 [label="Topic Modeling" color="#FFDA4E" fillcolor="#FFE88D" shape=inputoutput style=filled]
+	N8 [label="Regular Expressions for Text" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N9 [label="News Article Analysis" color="#D3EB9F" fillcolor="#F8FDD3" shape=rectangle style=filled]
+	N10 [label="Information Extraction" color="#FFDA4E" fillcolor="#FFE88D" shape=rectangle style=filled]
+	N11 [label="Opinion Mining" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N12 [label="Social Media Text Analysis" color="#66BB6A" fillcolor="#E8F5E9" shape=rect style=filled]
+	N13 [label="Sentiment Analysis" color="#D3EB9F" fillcolor="#F8FDD3" shape=document style=filled]
+	S0 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#66BB6A" fillcolor="#E8F5E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Concept Extraction {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Concept Extraction"
+		nest0_0 [label="Resume Parsing" color="#66BB6A" fillcolor="#E8F5E9" shape=predefinedprocess style=filled]
+		nest0_1 [label="Text Preprocessing" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+		nest0_2 [label="Text Visualization" color="#66BB6A" fillcolor="#E8F5E9" shape=document style=filled]
+	}
+	subgraph cluster_Relationship Extraction {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Relationship Extraction"
+		nest1_0 [label="Deep Learning for NLP" color="#66BB6A" fillcolor="#E8F5E9" shape=document style=filled]
+		nest1_1 [label="Annotation Tools" color="#D3EB9F" fillcolor="#F8FDD3" shape=predefinedprocess style=filled]
+		nest1_2 [label="Tokenization" color="#66BB6A" fillcolor="#E8F5E9" shape=multipledocuments style=filled]
+		nest1_3 [label="Natural Language Processing" color="#FFDA4E" fillcolor="#FFE88D" shape=action style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest0_0 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest1_0 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S0 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> S2 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	S2 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N8 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N13 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N9 -> M0 [color="#000000" penwidth=1.5 style=dashed label="processes" dir=forward]
+	N0 -> M0 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N11 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N6 -> M1 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N10 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N13 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	M2 -> N7 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_329.txt b/test/diagrams/graph_hard/diagrams_329.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4d7b9b40a8359ced1467b2e2290cef3934e68247
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_329.txt
@@ -0,0 +1,36 @@
+<Annotation Tools, connectedTo, Tokenization>
+<Automated Content Tagging, connectedTo, Part_of_Speech Tagging>
+<Automated Content Tagging, connectedTo, Topic Modeling>
+<Deep Learning for NLP, connectedTo, Annotation Tools>
+<Document Summarization, connectedTo, Deep Learning for NLP>
+<Document Summarization, connectedTo, Machine Learning for Text Mining>
+<Document Summarization, connectedTo, News Article Analysis>
+<Document Summarization, connectedTo, Opinion Mining>
+<Document Summarization, connectedTo, Sentiment Analysis>
+<Document Summarization, connectedTo, Topic Modeling>
+<Information Extraction, connectedTo, Opinion Mining>
+<Information Extraction, connectedTo, Sentiment Analysis>
+<Keyword Extraction, connectedTo, Automated Content Tagging>
+<Keyword Extraction, connectedTo, Opinion Mining>
+<Keyword Extraction, connectedTo, Topic Modeling>
+<Knowledge Graph Construction, connectedTo, Document Summarization>
+<Knowledge Graph Construction, connectedTo, Opinion Mining>
+<Lemmatization or Stemming, connectedTo, Knowledge Graph Construction>
+<Lemmatization or Stemming, connectedTo, Resume Parsing>
+<Machine Learning for Text Mining, connectedTo, News Article Analysis>
+<Machine Learning for Text Mining, connectedTo, Regular Expressions for Text>
+<Machine Learning for Text Mining, connectedTo, Sentiment Analysis>
+<Machine Learning for Text Mining, connectedTo, Topic Modeling>
+<Natural Language Processing, connectedTo, News Article Analysis>
+<News Article Analysis, connectedTo, Information Extraction>
+<News Article Analysis, processes, Opinion Mining>
+<Opinion Mining, connectedTo, Social Media Text Analysis>
+<Part_of_Speech Tagging, connectedTo, Lemmatization or Stemming>
+<Part_of_Speech Tagging, connectedTo, Topic Modeling>
+<Regular Expressions for Text, connectedTo, News Article Analysis>
+<Resume Parsing, connectedTo, Text Preprocessing>
+<Social Media Text Analysis, connectedTo, Sentiment Analysis>
+<Text Preprocessing, connectedTo, Text Visualization>
+<Text Visualization, connectedTo, Social Media Text Analysis>
+<Tokenization, connectedTo, Natural Language Processing>
+<Topic Modeling, connectedTo, Regular Expressions for Text>
diff --git a/test/diagrams/graph_hard/diagrams_33.dot b/test/diagrams/graph_hard/diagrams_33.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c9d21a7966151cc57d9fc7df9c5d0e53a2051cea
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_33.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=RL
+	N0 [label="Disease Detection" color="#388E3C" fillcolor="#C8E6C9" shape=predefinedprocess style=filled]
+	N1 [label="Animal Health Monitoring" color="#BA68C8" fillcolor="#F3E5F5" shape=rectangle style=filled]
+	N2 [label="Crop Rotation Planning" color="#795548" fillcolor="#D7CCC8" shape=rectangle style=filled]
+	N3 [label="Farm Maintenance" color="#388E3C" fillcolor="#C8E6C9" shape=inputoutput style=filled]
+	N4 [label="Traceability System" color="#795548" fillcolor="#D7CCC8" shape=inputoutput style=filled]
+	N5 [label="Automated Milking" color="#795548" fillcolor="#D7CCC8" shape=vnode_shape style=filled]
+	N6 [label="Livestock Feeding" color="#388E3C" fillcolor="#C8E6C9" shape=inputoutput style=filled]
+	N7 [label="Weed Removal" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N8 [label="Fencing Installation" color="#388E3C" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N9 [label="Grain Drying" color="#795548" fillcolor="#D7CCC8" shape=action style=filled]
+	N10 [label="Hydroponic System Management" color="#388E3C" fillcolor="#C8E6C9" shape=database style=filled]
+	N11 [label="Packaging for Sale" color="#BA68C8" fillcolor="#F3E5F5" shape=rectangle style=filled]
+	N12 [label="Yield Prediction" color="#388E3C" fillcolor="#C8E6C9" shape=database style=filled]
+	N13 [label="Greenhouse Control" color="#BA68C8" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N14 [label="Fertilizer Application" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N15 [label="Aquaculture Farming" color="#795548" fillcolor="#D7CCC8" shape=rect style=filled]
+	N16 [label="Seed Sowing" color="#388E3C" fillcolor="#C8E6C9" shape=multipledocuments style=filled]
+	N17 [label="Precision Farming" color="#795548" fillcolor="#D7CCC8" shape=inputoutput style=filled]
+	N18 [label="Market Transportation" color="#388E3C" fillcolor="#C8E6C9" shape=parallelogram style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Supply Chain to Retailers {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Supply Chain to Retailers"
+		nest0_0 [label="Forestry Management" color="#BA68C8" fillcolor="#F3E5F5" shape=rectangle style=filled]
+		nest0_1 [label="Weather Tracking" color="#BA68C8" fillcolor="#F3E5F5" shape=database style=filled]
+	}
+	subgraph cluster_Barn Cleaning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Barn Cleaning"
+		nest1_0 [label="Drone Scouting" color="#795548" fillcolor="#D7CCC8" shape=preparation style=filled]
+		nest1_1 [label="Irrigation Scheduling" color="#BA68C8" fillcolor="#F3E5F5" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid label="processes" dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N17 -> N18 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N12 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N13 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> S1 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	S1 -> N18 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	S1 -> N17 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N1 -> S2 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N17 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N5 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	M0 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N4 [color="#795548" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_33.txt b/test/diagrams/graph_hard/diagrams_33.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4390cf758db2e4fe421cb3032da048eb506fe82e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_33.txt
@@ -0,0 +1,35 @@
+<Animal Health Monitoring, connectedTo, Automated Milking>
+<Animal Health Monitoring, connectedTo, Crop Rotation Planning>
+<Animal Health Monitoring, connectedTo, Drone Scouting>
+<Animal Health Monitoring, connectedTo, Farm Maintenance>
+<Animal Health Monitoring, connectedTo, Packaging for Sale>
+<Animal Health Monitoring, connectedTo, Precision Farming>
+<Aquaculture Farming, connectedTo, Market Transportation>
+<Aquaculture Farming, connectedTo, Precision Farming>
+<Aquaculture Farming, connectedTo, Seed Sowing>
+<Automated Milking, connectedTo, Livestock Feeding>
+<Crop Rotation Planning, connectedTo, Farm Maintenance>
+<Crop Rotation Planning, connectedTo, Traceability System>
+<Disease Detection, connectedTo, Animal Health Monitoring>
+<Disease Detection, connectedTo, Farm Maintenance>
+<Disease Detection, connectedTo, Traceability System>
+<Drone Scouting, connectedTo, Irrigation Scheduling>
+<Farm Maintenance, connectedTo, Fencing Installation>
+<Farm Maintenance, connectedTo, Forestry Management>
+<Farm Maintenance, connectedTo, Traceability System>
+<Farm Maintenance, connectedTo, Yield Prediction>
+<Fencing Installation, connectedTo, Grain Drying>
+<Fertilizer Application, connectedTo, Aquaculture Farming>
+<Forestry Management, connectedTo, Weather Tracking>
+<Grain Drying, connectedTo, Hydroponic System Management>
+<Greenhouse Control, connectedTo, Fertilizer Application>
+<Hydroponic System Management, processes, Packaging for Sale>
+<Irrigation Scheduling, connectedTo, Greenhouse Control>
+<Livestock Feeding, connectedTo, Weed Removal>
+<Packaging for Sale, connectedTo, Yield Prediction>
+<Precision Farming, connectedTo, Market Transportation>
+<Seed Sowing, connectedTo, Precision Farming>
+<Traceability System, connectedTo, Automated Milking>
+<Weather Tracking, connectedTo, Yield Prediction>
+<Weed Removal, connectedTo, Fencing Installation>
+<Yield Prediction, connectedTo, Greenhouse Control>
diff --git a/test/diagrams/graph_hard/diagrams_330.dot b/test/diagrams/graph_hard/diagrams_330.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c8f621359e07a02aa15dd68f10733492378f298c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_330.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=RL
+	N0 [label="Chatbot Development" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+	N1 [label="Customer Feedback Analysis" color="#90A4AE" fillcolor="#ECEFF1" shape=predefinedprocess style=filled]
+	N2 [label="Tokenization" color="#90A4AE" fillcolor="#ECEFF1" shape=action style=filled]
+	N3 [label="Text Similarity Analysis" color="#FFDA4E" fillcolor="#FFE88D" shape=diamond style=filled]
+	N4 [label="Legal Document Analysis" color="#A188DB" fillcolor="#DED7F0" shape=action style=filled]
+	N5 [label="Data Cleaning for Text" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N6 [label="Opinion Mining" color="#90A4AE" fillcolor="#ECEFF1" shape=document style=filled]
+	N7 [label="Social Media Text Analysis" color="#90A4AE" fillcolor="#ECEFF1" shape=action style=filled]
+	N8 [label="Text Visualization" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N9 [label="Resume Parsing" color="#90A4AE" fillcolor="#ECEFF1" shape=rectangle style=filled]
+	N10 [label="Natural Language Processing" color="#A188DB" fillcolor="#DED7F0" shape=document style=filled]
+	N11 [label="News Article Analysis" color="#FFDA4E" fillcolor="#FFE88D" shape=document style=filled]
+	N12 [label="Named Entity Recognition" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N13 [label="Lemmatization or Stemming" color="#A188DB" fillcolor="#DED7F0" shape=parallelogram style=filled]
+	N14 [label="Plagiarism Detection" color="#90A4AE" fillcolor="#ECEFF1" shape=inputoutput style=filled]
+	N15 [label="Sentiment Analysis" color="#FFDA4E" fillcolor="#FFE88D" shape=document style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Knowledge Graph Construction {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Knowledge Graph Construction"
+		nest0_0 [label="Corpus Creation" color="#FFDA4E" fillcolor="#FFE88D" shape=action style=filled]
+		nest0_1 [label="Text Classification" color="#A188DB" fillcolor="#DED7F0" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Deep Learning for NLP {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Deep Learning for NLP"
+		nest1_0 [label="Part_of_Speech Tagging" color="#FFDA4E" fillcolor="#FFE88D" shape=action style=filled]
+		nest1_1 [label="Regular Expressions for Text" color="#90A4AE" fillcolor="#ECEFF1" shape=predefinedprocess style=filled]
+		nest1_2 [label="Vector Space Models" color="#FFDA4E" fillcolor="#FFE88D" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid label="builds_tools" dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest0_0 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N6 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest1_0 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N8 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N11 -> S0 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#90A4AE" penwidth=1.5 style=solid label="summarizes" dir=forward]
+	N5 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N6 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N14 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#A188DB" penwidth=1.5 style=dashed label="clusters" dir=forward]
+	N3 -> M0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N7 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	M1 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_330.txt b/test/diagrams/graph_hard/diagrams_330.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c9a96ce2c71688ef91862800967a991454144f34
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_330.txt
@@ -0,0 +1,37 @@
+<Chatbot Development, connectedTo, Customer Feedback Analysis>
+<Chatbot Development, connectedTo, Opinion Mining>
+<Corpus Creation, connectedTo, Text Classification>
+<Customer Feedback Analysis, builds_tools, Tokenization>
+<Customer Feedback Analysis, clusters, Social Media Text Analysis>
+<Data Cleaning for Text, connectedTo, Lemmatization or Stemming>
+<Data Cleaning for Text, connectedTo, Named Entity Recognition>
+<Data Cleaning for Text, connectedTo, Opinion Mining>
+<Data Cleaning for Text, connectedTo, Social Media Text Analysis>
+<Legal Document Analysis, connectedTo, Data Cleaning for Text>
+<Legal Document Analysis, connectedTo, Opinion Mining>
+<Lemmatization or Stemming, connectedTo, Plagiarism Detection>
+<Named Entity Recognition, connectedTo, Lemmatization or Stemming>
+<Named Entity Recognition, connectedTo, Part_of_Speech Tagging>
+<Natural Language Processing, connectedTo, News Article Analysis>
+<News Article Analysis, connectedTo, Named Entity Recognition>
+<News Article Analysis, connectedTo, Sentiment Analysis>
+<News Article Analysis, summarizes, Lemmatization or Stemming>
+<Opinion Mining, connectedTo, News Article Analysis>
+<Opinion Mining, connectedTo, Plagiarism Detection>
+<Opinion Mining, connectedTo, Resume Parsing>
+<Opinion Mining, connectedTo, Social Media Text Analysis>
+<Part_of_Speech Tagging, connectedTo, Regular Expressions for Text>
+<Plagiarism Detection, connectedTo, Sentiment Analysis>
+<Regular Expressions for Text, connectedTo, Vector Space Models>
+<Resume Parsing, connectedTo, Natural Language Processing>
+<Social Media Text Analysis, connectedTo, Text Visualization>
+<Text Classification, connectedTo, Opinion Mining>
+<Text Similarity Analysis, connectedTo, Legal Document Analysis>
+<Text Similarity Analysis, connectedTo, Opinion Mining>
+<Text Similarity Analysis, connectedTo, Social Media Text Analysis>
+<Text Visualization, connectedTo, Corpus Creation>
+<Text Visualization, connectedTo, Resume Parsing>
+<Tokenization, connectedTo, Opinion Mining>
+<Tokenization, connectedTo, Social Media Text Analysis>
+<Tokenization, connectedTo, Text Similarity Analysis>
+<Vector Space Models, connectedTo, Text Visualization>
diff --git a/test/diagrams/graph_hard/diagrams_331.dot b/test/diagrams/graph_hard/diagrams_331.dot
new file mode 100644
index 0000000000000000000000000000000000000000..43af2f51b7def4bb80c93bcd5dbe40ed75330629
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_331.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=RL
+	N0 [label="Augmented Reality Visualization" color="#2196F3" fillcolor="#BBDEFB" shape=vnode_shape style=filled]
+	N1 [label="Remote Control Capabilities" color="#2196F3" fillcolor="#BBDEFB" shape=action style=filled]
+	N2 [label="Interoperability Standards" color="#64B5F6" fillcolor="#E3F2FD" shape=document style=filled]
+	N3 [label="Building Information Modeling Integration" color="#AF56A6" fillcolor="#DDCEDD" shape=document style=filled]
+	N4 [label="Edge Computing for Twins" color="#AF56A6" fillcolor="#DDCEDD" shape=vnode_shape style=filled]
+	N5 [label="Model Creation" color="#2196F3" fillcolor="#BBDEFB" shape=multipledocuments style=filled]
+	N6 [label="Virtual Prototyping" color="#AF56A6" fillcolor="#DDCEDD" shape=rect style=filled]
+	N7 [label="What_If Scenario Analysis" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N8 [label="Data Governance for Twins" color="#64B5F6" fillcolor="#E3F2FD" shape=action style=filled]
+	N9 [label="Cyber_Physical Systems" color="#AF56A6" fillcolor="#DDCEDD" shape=action style=filled]
+	N10 [label="Data Security for Digital Twins" color="#2196F3" fillcolor="#BBDEFB" shape=multipledocuments style=filled]
+	N11 [label="Asset Optimization" color="#AF56A6" fillcolor="#DDCEDD" shape=document style=filled]
+	N12 [label="Anomaly Detection" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N13 [label="Risk Assessment" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+	S0 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Digital Twin Lifecycle Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Digital Twin Lifecycle Management"
+		nest0_0 [label="Historical Data Analysis" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+		nest0_1 [label="Lifecycle Management" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest0_2 [label="Real_Time Data Streaming" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+		nest0_3 [label="Aerospace Digital Twins" color="#64B5F6" fillcolor="#E3F2FD" shape=rectangle style=filled]
+	}
+	subgraph cluster_Scalability of Models {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Scalability of Models"
+		nest1_0 [label="IoT Data Ingestion" color="#AF56A6" fillcolor="#DDCEDD" shape=predefinedprocess style=filled]
+		nest1_1 [label="Performance Monitoring" color="#64B5F6" fillcolor="#E3F2FD" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#64B5F6" penwidth=1.5 style=solid label="creates" dir=forward]
+	N5 -> N6 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#64B5F6" penwidth=1.5 style=dashed label="builds" dir=forward]
+	N7 -> N8 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#2196F3" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N10 -> nest0_0 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N11 -> nest1_0 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N2 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N9 -> S1 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#64B5F6" penwidth=1.5 style=dashed label="governs" dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N5 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N10 -> M1 [color="#2196F3" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_331.txt b/test/diagrams/graph_hard/diagrams_331.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9513f9ce8f5ecdd21554d45bca1c4213a054a481
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_331.txt
@@ -0,0 +1,30 @@
+<Aerospace Digital Twins, connectedTo, Cyber_Physical Systems>
+<Anomaly Detection, connectedTo, Risk Assessment>
+<Asset Optimization, connectedTo, Anomaly Detection>
+<Asset Optimization, connectedTo, IoT Data Ingestion>
+<Augmented Reality Visualization, connectedTo, Model Creation>
+<Augmented Reality Visualization, connectedTo, Remote Control Capabilities>
+<Building Information Modeling Integration, connectedTo, Data Governance for Twins>
+<Building Information Modeling Integration, connectedTo, Data Security for Digital Twins>
+<Building Information Modeling Integration, connectedTo, Edge Computing for Twins>
+<Cyber_Physical Systems, connectedTo, Anomaly Detection>
+<Cyber_Physical Systems, connectedTo, Data Security for Digital Twins>
+<Cyber_Physical Systems, governs, Risk Assessment>
+<Data Governance for Twins, connectedTo, Cyber_Physical Systems>
+<Data Security for Digital Twins, connectedTo, Asset Optimization>
+<Data Security for Digital Twins, connectedTo, Historical Data Analysis>
+<Data Security for Digital Twins, connectedTo, Risk Assessment>
+<Edge Computing for Twins, creates, Model Creation>
+<Historical Data Analysis, connectedTo, Lifecycle Management>
+<Interoperability Standards, connectedTo, Building Information Modeling Integration>
+<Interoperability Standards, connectedTo, Model Creation>
+<IoT Data Ingestion, connectedTo, Performance Monitoring>
+<Lifecycle Management, connectedTo, Real_Time Data Streaming>
+<Model Creation, connectedTo, Virtual Prototyping>
+<Performance Monitoring, connectedTo, Interoperability Standards>
+<Real_Time Data Streaming, connectedTo, Aerospace Digital Twins>
+<Remote Control Capabilities, connectedTo, Interoperability Standards>
+<Remote Control Capabilities, connectedTo, Model Creation>
+<Virtual Prototyping, builds, What_If Scenario Analysis>
+<What_If Scenario Analysis, connectedTo, Data Governance for Twins>
+<What_If Scenario Analysis, connectedTo, Risk Assessment>
diff --git a/test/diagrams/graph_hard/diagrams_332.dot b/test/diagrams/graph_hard/diagrams_332.dot
new file mode 100644
index 0000000000000000000000000000000000000000..861723ac182b88d499bb0fb8714aeca5a2e16b4c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_332.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=TB
+	N0 [label="IoT Data Ingestion" color="#FFB2A5" fillcolor="#FFDCD6" shape=predefinedprocess style=filled]
+	N1 [label="Digital Twin Lifecycle Management" color="#B8C0F5" fillcolor="#ECF0FD" shape=rect style=filled]
+	N2 [label="Operational Planning" color="#B8C0F5" fillcolor="#ECF0FD" shape=vnode_shape style=filled]
+	N3 [label="Data Governance for Twins" color="#FFB2A5" fillcolor="#FFDCD6" shape=preparation style=filled]
+	N4 [label="Maintenance Scheduling" color="#FFB2A5" fillcolor="#FFDCD6" shape=rect style=filled]
+	N5 [label="Real_Time Data Streaming" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N6 [label="Anomaly Detection" color="#B8C0F5" fillcolor="#ECF0FD" shape=preparation style=filled]
+	N7 [label="Virtual Reality Interaction" color="#81C784" fillcolor="#F1F8E9" shape=rectangle style=filled]
+	N8 [label="Building Information Modeling Integration" color="#81C784" fillcolor="#F1F8E9" shape=action style=filled]
+	N9 [label="Smart Manufacturing" color="#B8C0F5" fillcolor="#ECF0FD" shape=rectangle style=filled]
+	N10 [label="Risk Assessment" color="#FFB2A5" fillcolor="#FFDCD6" shape=predefinedprocess style=filled]
+	N11 [label="Aerospace Digital Twins" color="#81C784" fillcolor="#F1F8E9" shape=action style=filled]
+	N12 [label="Condition Monitoring" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+	N13 [label="Enterprise Asset Management Integration" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+	S0 [label="" color="#FFB2A5" fillcolor="#FFDCD6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFB2A5" fillcolor="#FFDCD6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Virtual Prototyping {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Virtual Prototyping"
+		nest0_0 [label="Edge Computing for Twins" color="#FFB2A5" fillcolor="#FFDCD6" shape=predefinedprocess style=filled]
+		nest0_1 [label="Energy Consumption Optimization" color="#B8C0F5" fillcolor="#ECF0FD" shape=action style=filled]
+		nest0_2 [label="Automotive Digital Twins" color="#B8C0F5" fillcolor="#ECF0FD" shape=vnode_shape style=filled]
+		nest0_3 [label="Historical Data Analysis" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	}
+	subgraph cluster_AI or ML Model Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="AI or ML Model Integration"
+		nest1_0 [label="Lifecycle Management" color="#81C784" fillcolor="#F1F8E9" shape=hexagon style=filled]
+		nest1_1 [label="Performance Monitoring" color="#FFB2A5" fillcolor="#FFDCD6" shape=multipledocuments style=filled]
+		nest1_2 [label="Scalability of Models" color="#FFB2A5" fillcolor="#FFDCD6" shape=predefinedprocess style=filled]
+		nest1_3 [label="Model Creation" color="#B8C0F5" fillcolor="#ECF0FD" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#FFB2A5" penwidth=1.5 style=dashed label="IoT_integrates" dir=forward]
+	N12 -> nest0_0 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N1 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S0 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N4 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> S1 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M2 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#B8C0F5" penwidth=1.5 style=solid label="sensors_connects" dir=forward]
+	M2 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_332.txt b/test/diagrams/graph_hard/diagrams_332.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0afed7e236eea1eaadab579e460e2dedeb650866
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_332.txt
@@ -0,0 +1,34 @@
+<Aerospace Digital Twins, connectedTo, Condition Monitoring>
+<Anomaly Detection, connectedTo, Aerospace Digital Twins>
+<Anomaly Detection, connectedTo, Virtual Reality Interaction>
+<Automotive Digital Twins, IoT_integrates, Historical Data Analysis>
+<Building Information Modeling Integration, connectedTo, Smart Manufacturing>
+<Condition Monitoring, connectedTo, Edge Computing for Twins>
+<Condition Monitoring, connectedTo, Enterprise Asset Management Integration>
+<Data Governance for Twins, connectedTo, Maintenance Scheduling>
+<Data Governance for Twins, connectedTo, Virtual Reality Interaction>
+<Digital Twin Lifecycle Management, connectedTo, Aerospace Digital Twins>
+<Digital Twin Lifecycle Management, connectedTo, Building Information Modeling Integration>
+<Digital Twin Lifecycle Management, connectedTo, Maintenance Scheduling>
+<Digital Twin Lifecycle Management, connectedTo, Operational Planning>
+<Digital Twin Lifecycle Management, connectedTo, Virtual Reality Interaction>
+<Edge Computing for Twins, connectedTo, Energy Consumption Optimization>
+<Energy Consumption Optimization, connectedTo, Automotive Digital Twins>
+<Historical Data Analysis, connectedTo, Smart Manufacturing>
+<IoT Data Ingestion, connectedTo, Digital Twin Lifecycle Management>
+<IoT Data Ingestion, connectedTo, Virtual Reality Interaction>
+<Lifecycle Management, connectedTo, Performance Monitoring>
+<Maintenance Scheduling, connectedTo, Real_Time Data Streaming>
+<Maintenance Scheduling, sensors_connects, Aerospace Digital Twins>
+<Model Creation, connectedTo, Digital Twin Lifecycle Management>
+<Operational Planning, connectedTo, Data Governance for Twins>
+<Performance Monitoring, connectedTo, Scalability of Models>
+<Real_Time Data Streaming, connectedTo, Anomaly Detection>
+<Risk Assessment, connectedTo, Aerospace Digital Twins>
+<Scalability of Models, connectedTo, Model Creation>
+<Smart Manufacturing, connectedTo, Lifecycle Management>
+<Smart Manufacturing, connectedTo, Risk Assessment>
+<Virtual Reality Interaction, connectedTo, Aerospace Digital Twins>
+<Virtual Reality Interaction, connectedTo, Building Information Modeling Integration>
+<Virtual Reality Interaction, connectedTo, Condition Monitoring>
+<Virtual Reality Interaction, connectedTo, Risk Assessment>
diff --git a/test/diagrams/graph_hard/diagrams_333.dot b/test/diagrams/graph_hard/diagrams_333.dot
new file mode 100644
index 0000000000000000000000000000000000000000..01fdbcdb439f299b3cbb06168c148d2a2ff352e2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_333.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=RL
+	N0 [label="Autonomous Operations" color="#CDDC39" fillcolor="#E6EE9C" shape=preparation style=filled]
+	N1 [label="Smart City Planning" color="#5C6BC0" fillcolor="#E8EAF6" shape=document style=filled]
+	N2 [label="Anomaly Detection" color="#CDDC39" fillcolor="#E6EE9C" shape=preparation style=filled]
+	N3 [label="Asset Optimization" color="#CDDC39" fillcolor="#E6EE9C" shape=parallelogram style=filled]
+	N4 [label="Sensor Data Integration" color="#3F51B5" fillcolor="#C5CAE9" shape=parallelogram style=filled]
+	N5 [label="Virtual Reality Interaction" color="#CDDC39" fillcolor="#E6EE9C" shape=vnode_shape style=filled]
+	N6 [label="Edge Computing for Twins" color="#CDDC39" fillcolor="#E6EE9C" shape=inputoutput style=filled]
+	N7 [label="Simulation Platform Development" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+	N8 [label="Predictive Maintenance" color="#3F51B5" fillcolor="#C5CAE9" shape=rect style=filled]
+	N9 [label="Interoperability Standards" color="#5C6BC0" fillcolor="#E8EAF6" shape=preparation style=filled]
+	S0 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Data Security for Digital Twins {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Data Security for Digital Twins"
+		nest0_0 [label="Operational Planning" color="#3F51B5" fillcolor="#C5CAE9" shape=rectangle style=filled]
+		nest0_1 [label="Cyber_Physical Systems" color="#CDDC39" fillcolor="#E6EE9C" shape=database style=filled]
+		nest0_2 [label="AI or ML Model Integration" color="#3F51B5" fillcolor="#C5CAE9" shape=multipledocuments style=filled]
+		nest0_3 [label="Model Creation" color="#5C6BC0" fillcolor="#E8EAF6" shape=rectangle style=filled]
+	}
+	subgraph cluster_Enterprise Asset Management Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Enterprise Asset Management Integration"
+		nest1_0 [label="Scalability of Models" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+		nest1_1 [label="Condition Monitoring" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+		nest1_2 [label="Smart Manufacturing" color="#CDDC39" fillcolor="#E6EE9C" shape=rectangle style=filled]
+		nest1_3 [label="Risk Assessment" color="#CDDC39" fillcolor="#E6EE9C" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest0_0 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N8 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N5 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N0 -> S0 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S1 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_333.txt b/test/diagrams/graph_hard/diagrams_333.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7b8a68d3ead0e5b80dc803becccdc4fae263fc13
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_333.txt
@@ -0,0 +1,28 @@
+<AI or ML Model Integration, connectedTo, Model Creation>
+<Anomaly Detection, connectedTo, Asset Optimization>
+<Anomaly Detection, connectedTo, Scalability of Models>
+<Asset Optimization, connectedTo, Operational Planning>
+<Asset Optimization, connectedTo, Sensor Data Integration>
+<Asset Optimization, connectedTo, Simulation Platform Development>
+<Autonomous Operations, connectedTo, Predictive Maintenance>
+<Autonomous Operations, connectedTo, Sensor Data Integration>
+<Autonomous Operations, connectedTo, Smart City Planning>
+<Condition Monitoring, connectedTo, Smart Manufacturing>
+<Cyber_Physical Systems, connectedTo, AI or ML Model Integration>
+<Edge Computing for Twins, connectedTo, Simulation Platform Development>
+<Model Creation, connectedTo, Predictive Maintenance>
+<Operational Planning, connectedTo, Cyber_Physical Systems>
+<Predictive Maintenance, connectedTo, Interoperability Standards>
+<Risk Assessment, connectedTo, Virtual Reality Interaction>
+<Scalability of Models, connectedTo, Condition Monitoring>
+<Sensor Data Integration, connectedTo, Simulation Platform Development>
+<Sensor Data Integration, connectedTo, Virtual Reality Interaction>
+<Simulation Platform Development, connectedTo, Predictive Maintenance>
+<Smart City Planning, connectedTo, Anomaly Detection>
+<Smart City Planning, connectedTo, Sensor Data Integration>
+<Smart City Planning, connectedTo, Simulation Platform Development>
+<Smart Manufacturing, connectedTo, Risk Assessment>
+<Virtual Reality Interaction, connectedTo, Edge Computing for Twins>
+<Virtual Reality Interaction, connectedTo, Interoperability Standards>
+<Virtual Reality Interaction, connectedTo, Predictive Maintenance>
+<Virtual Reality Interaction, connectedTo, Simulation Platform Development>
diff --git a/test/diagrams/graph_hard/diagrams_334.dot b/test/diagrams/graph_hard/diagrams_334.dot
new file mode 100644
index 0000000000000000000000000000000000000000..72e667dbce5032afaf7d16880efe0f06c623b38f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_334.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=LR
+	N0 [label="Process Mining" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N1 [label="Error Handling in Automation" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N2 [label="Orchestration of Processes" color="#7E57C2" fillcolor="#EDE7F6" shape=document style=filled]
+	N3 [label="Customer Service Automation" color="#D3EB9F" fillcolor="#F8FDD3" shape=multipledocuments style=filled]
+	N4 [label="Business Rule Engines" color="#9FA9E1" fillcolor="#D6D9F0" shape=predefinedprocess style=filled]
+	N5 [label="Change Management for Automation" color="#7E57C2" fillcolor="#EDE7F6" shape=action style=filled]
+	N6 [label="Supply Chain Automation" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N7 [label="Optical Character Recognition for Automation" color="#D3EB9F" fillcolor="#F8FDD3" shape=rect style=filled]
+	N8 [label="Low_Code or No_Code Automation" color="#D3EB9F" fillcolor="#F8FDD3" shape=vnode_shape style=filled]
+	N9 [label="Finance Process Automation" color="#9FA9E1" fillcolor="#D6D9F0" shape=rectangle style=filled]
+	N10 [label="Return on Investment Calculation" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	S1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#7E57C2" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Document Processing Automation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Document Processing Automation"
+		nest0_0 [label="Audit Trail for Automation" color="#7E57C2" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+		nest0_1 [label="IT Operations Automation" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	}
+	subgraph cluster_Workflow Automation Platforms {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Workflow Automation Platforms"
+		nest1_0 [label="Scalability of Automation" color="#9FA9E1" fillcolor="#D6D9F0" shape=database style=filled]
+		nest1_1 [label="Intelligent Automation" color="#9FA9E1" fillcolor="#D6D9F0" shape=action style=filled]
+		nest1_2 [label="Automation Opportunity Identification" color="#7E57C2" fillcolor="#EDE7F6" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#7E57C2" penwidth=1.5 style=dashed label="develops_solutions" dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N6 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest1_0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N3 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S1 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#7E57C2" penwidth=1.5 style=dashed label="monitors" dir=forward]
+	S1 -> N9 [color="#D3EB9F" penwidth=1.5 style=dashed label="scales_processes" dir=forward]
+	S1 -> N8 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N3 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N5 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_334.txt b/test/diagrams/graph_hard/diagrams_334.txt
new file mode 100644
index 0000000000000000000000000000000000000000..46afb14a98d91501b50bc70211241a39d31467f5
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_334.txt
@@ -0,0 +1,24 @@
+<Audit Trail for Automation, connectedTo, IT Operations Automation>
+<Automation Opportunity Identification, connectedTo, Customer Service Automation>
+<Business Rule Engines, connectedTo, Change Management for Automation>
+<Change Management for Automation, connectedTo, Supply Chain Automation>
+<Customer Service Automation, connectedTo, Business Rule Engines>
+<Error Handling in Automation, connectedTo, Change Management for Automation>
+<Error Handling in Automation, connectedTo, Customer Service Automation>
+<Error Handling in Automation, connectedTo, Orchestration of Processes>
+<Finance Process Automation, connectedTo, Return on Investment Calculation>
+<IT Operations Automation, connectedTo, Supply Chain Automation>
+<Intelligent Automation, connectedTo, Automation Opportunity Identification>
+<Low_Code or No_Code Automation, connectedTo, Scalability of Automation>
+<Low_Code or No_Code Automation, develops_solutions, Finance Process Automation>
+<Optical Character Recognition for Automation, connectedTo, Low_Code or No_Code Automation>
+<Orchestration of Processes, connectedTo, Audit Trail for Automation>
+<Orchestration of Processes, connectedTo, Customer Service Automation>
+<Process Mining, connectedTo, Change Management for Automation>
+<Process Mining, connectedTo, Customer Service Automation>
+<Process Mining, connectedTo, Error Handling in Automation>
+<Scalability of Automation, connectedTo, Intelligent Automation>
+<Supply Chain Automation, connectedTo, Low_Code or No_Code Automation>
+<Supply Chain Automation, connectedTo, Optical Character Recognition for Automation>
+<Supply Chain Automation, monitors, Return on Investment Calculation>
+<Supply Chain Automation, scales_processes, Finance Process Automation>
diff --git a/test/diagrams/graph_hard/diagrams_335.dot b/test/diagrams/graph_hard/diagrams_335.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1c0807db98c79ab65ac74bc0d4ca9d06a552825d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_335.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=LR
+	N0 [label="Low_Code or No_Code Automation" color="#A1887F" fillcolor="#EFEBE9" shape=vnode_shape style=filled]
+	N1 [label="User Training for Automated Systems" color="#388E3C" fillcolor="#C8E6C9" shape=vnode_shape style=filled]
+	N2 [label="Process Mining" color="#FFEB3B" fillcolor="#FFF9C4" shape=multipledocuments style=filled]
+	N3 [label="Compliance in Automation" color="#FFEB3B" fillcolor="#FFF9C4" shape=database style=filled]
+	N4 [label="Intelligent Automation" color="#A1887F" fillcolor="#EFEBE9" shape=multipledocuments style=filled]
+	N5 [label="Scripting for Automation" color="#388E3C" fillcolor="#C8E6C9" shape=inputoutput style=filled]
+	N6 [label="Supply Chain Automation" color="#388E3C" fillcolor="#C8E6C9" shape=database style=filled]
+	N7 [label="Automation Opportunity Identification" color="#FFEB3B" fillcolor="#FFF9C4" shape=preparation style=filled]
+	S0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#388E3C" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A1887F" fillcolor="#EFEBE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Customer Service Automation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Customer Service Automation"
+		nest0_0 [label="Business Rule Engines" color="#388E3C" fillcolor="#C8E6C9" shape=preparation style=filled]
+		nest0_1 [label="Decision Automation" color="#FFEB3B" fillcolor="#FFF9C4" shape=predefinedprocess style=filled]
+		nest0_2 [label="Performance Monitoring of Bots" color="#FFEB3B" fillcolor="#FFF9C4" shape=action style=filled]
+		nest0_3 [label="IT Operations Automation" color="#A1887F" fillcolor="#EFEBE9" shape=diamond style=filled]
+	}
+	subgraph cluster_Chatbot Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Chatbot Integration"
+		nest1_0 [label="Robotic Process Automation Implementation" color="#A1887F" fillcolor="#EFEBE9" shape=rectangle style=filled]
+		nest1_1 [label="Finance Process Automation" color="#FFEB3B" fillcolor="#FFF9C4" shape=database style=filled]
+		nest1_2 [label="Workflow Analysis" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed label="tests" dir=forward]
+	N2 -> N3 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N3 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N6 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N3 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	S0 -> N4 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#A1887F" penwidth=1.5 style=solid label="upgrades" dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N7 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_335.txt b/test/diagrams/graph_hard/diagrams_335.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0ddde2c37646e06f38c6f954fcfcdc514ed7e9a1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_335.txt
@@ -0,0 +1,24 @@
+<Business Rule Engines, connectedTo, Decision Automation>
+<Compliance in Automation, connectedTo, Automation Opportunity Identification>
+<Compliance in Automation, connectedTo, Business Rule Engines>
+<Compliance in Automation, connectedTo, Intelligent Automation>
+<Decision Automation, connectedTo, Performance Monitoring of Bots>
+<Finance Process Automation, connectedTo, Workflow Analysis>
+<IT Operations Automation, connectedTo, Compliance in Automation>
+<Intelligent Automation, connectedTo, Automation Opportunity Identification>
+<Intelligent Automation, connectedTo, Scripting for Automation>
+<Low_Code or No_Code Automation, connectedTo, Automation Opportunity Identification>
+<Low_Code or No_Code Automation, connectedTo, User Training for Automated Systems>
+<Performance Monitoring of Bots, connectedTo, IT Operations Automation>
+<Process Mining, connectedTo, Compliance in Automation>
+<Process Mining, upgrades, Automation Opportunity Identification>
+<Robotic Process Automation Implementation, connectedTo, Finance Process Automation>
+<Scripting for Automation, connectedTo, Automation Opportunity Identification>
+<Scripting for Automation, connectedTo, Supply Chain Automation>
+<Supply Chain Automation, connectedTo, Automation Opportunity Identification>
+<User Training for Automated Systems, connectedTo, Automation Opportunity Identification>
+<User Training for Automated Systems, connectedTo, Compliance in Automation>
+<User Training for Automated Systems, connectedTo, Intelligent Automation>
+<User Training for Automated Systems, connectedTo, Robotic Process Automation Implementation>
+<User Training for Automated Systems, tests, Process Mining>
+<Workflow Analysis, connectedTo, Supply Chain Automation>
diff --git a/test/diagrams/graph_hard/diagrams_336.txt b/test/diagrams/graph_hard/diagrams_336.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e61db9cce37949696a574d3e459754a13fb4e8e6
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_336.txt
@@ -0,0 +1,30 @@
+<Audit Trail for Automation, connectedTo, Business Process Management>
+<Automated Data Validation, connectedTo, Audit Trail for Automation>
+<Automated Data Validation, connectedTo, Process Mapping>
+<Automated Data Validation, connectedTo, Process Mining>
+<Automated Data Validation, connectedTo, User Training for Automated Systems>
+<Automated Data Validation, reduces_costs, Optical Character Recognition for Automation>
+<Business Process Management, connectedTo, Optical Character Recognition for Automation>
+<Business Process Management, connectedTo, User Training for Automated Systems>
+<Chatbot Integration, connectedTo, Customer Service Automation>
+<Chatbot Integration, connectedTo, Process Mapping>
+<Customer Service Automation, connectedTo, Scripting for Automation>
+<Decision Automation, connectedTo, Automated Data Validation>
+<Decision Automation, connectedTo, User Training for Automated Systems>
+<Error Handling in Automation, connectedTo, Audit Trail for Automation>
+<Error Handling in Automation, connectedTo, Decision Automation>
+<Error Handling in Automation, connectedTo, Optical Character Recognition for Automation>
+<Error Handling in Automation, connectedTo, Orchestration of Processes>
+<Error Handling in Automation, increases_efficiency, User Training for Automated Systems>
+<Finance Process Automation, connectedTo, Error Handling in Automation>
+<IT Operations Automation, connectedTo, Finance Process Automation>
+<Intelligent Automation, connectedTo, Process Mapping>
+<Optical Character Recognition for Automation, errors_detects, User Training for Automated Systems>
+<Performance Monitoring of Bots, connectedTo, Return on Investment Calculation>
+<Process Mapping, connectedTo, Orchestration of Processes>
+<Process Mapping, connectedTo, Performance Monitoring of Bots>
+<Process Mining, connectedTo, Chatbot Integration>
+<Return on Investment Calculation, connectedTo, Robotic Process Automation Implementation>
+<Robotic Process Automation Implementation, connectedTo, Intelligent Automation>
+<Scripting for Automation, connectedTo, Chatbot Integration>
+<User Training for Automated Systems, connectedTo, Process Mining>
diff --git a/test/diagrams/graph_hard/diagrams_337.dot b/test/diagrams/graph_hard/diagrams_337.dot
new file mode 100644
index 0000000000000000000000000000000000000000..52f3c18e250def702497461899f93c2c10a2beb9
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_337.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=BT
+	N0 [label="Inspection Procedures" color="#92C79A" fillcolor="#E8F0EA" shape=action style=filled]
+	N1 [label="Lean Principles in Quality" color="#7E57C2" fillcolor="#EDE7F6" shape=diamond style=filled]
+	N2 [label="Statistical Process Control" color="#7E57C2" fillcolor="#EDE7F6" shape=database style=filled]
+	N3 [label="Defect Detection" color="#6EB76D" fillcolor="#E9F7E8" shape=diamond style=filled]
+	N4 [label="Root Cause Analysis" color="#6EB76D" fillcolor="#E9F7E8" shape=diamond style=filled]
+	N5 [label="Quality Management Systems" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N6 [label="Non_Conformance Management" color="#92C79A" fillcolor="#E8F0EA" shape=parallelogram style=filled]
+	N7 [label="Process Monitoring" color="#7E57C2" fillcolor="#EDE7F6" shape=action style=filled]
+	N8 [label="Trend Analysis" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+	N9 [label="Continuous Improvement" color="#7E57C2" fillcolor="#EDE7F6" shape=rect style=filled]
+	N10 [label="Supplier Audits" color="#7E57C2" fillcolor="#EDE7F6" shape=action style=filled]
+	N11 [label="Service Quality Management" color="#7E57C2" fillcolor="#EDE7F6" shape=rect style=filled]
+	N12 [label="Hardware Quality Testing" color="#92C79A" fillcolor="#E8F0EA" shape=inputoutput style=filled]
+	N13 [label="Audit Planning" color="#6EB76D" fillcolor="#E9F7E8" shape=rect style=filled]
+	N14 [label="Quality Control Tools" color="#92C79A" fillcolor="#E8F0EA" shape=parallelogram style=filled]
+	N15 [label="Quality Planning" color="#7E57C2" fillcolor="#EDE7F6" shape=predefinedprocess style=filled]
+	N16 [label="Customer Feedback Analysis" color="#6EB76D" fillcolor="#E9F7E8" shape=hexagon style=filled]
+	N17 [label="Food Safety Quality Control" color="#7E57C2" fillcolor="#EDE7F6" shape=action style=filled]
+	S0 [label="" color="#92C79A" fillcolor="#E8F0EA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Calibration of Instruments {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Calibration of Instruments"
+		nest0_0 [label="Quality Data Analysis" color="#6EB76D" fillcolor="#E9F7E8" shape=vnode_shape style=filled]
+		nest0_1 [label="Corrective and Preventive Actions" color="#92C79A" fillcolor="#E8F0EA" shape=rectangle style=filled]
+	}
+	subgraph cluster_Component Inspection {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Component Inspection"
+		nest1_0 [label="Total Quality Management" color="#7E57C2" fillcolor="#EDE7F6" shape=diamond style=filled]
+		nest1_1 [label="ISO Certification" color="#7E57C2" fillcolor="#EDE7F6" shape=preparation style=filled]
+		nest1_2 [label="Non_Destructive Testing" color="#7E57C2" fillcolor="#EDE7F6" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest0_0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N10 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest1_0 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N7 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	N13 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N16 [color="#92C79A" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	S0 -> N17 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#6EB76D" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N7 [color="#92C79A" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_337.txt b/test/diagrams/graph_hard/diagrams_337.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c17a5c97e3b8f3e6f450839adc46a22a1a448f09
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_337.txt
@@ -0,0 +1,32 @@
+<Audit Planning, connectedTo, Customer Feedback Analysis>
+<Audit Planning, connectedTo, Food Safety Quality Control>
+<Audit Planning, connectedTo, Quality Control Tools>
+<Audit Planning, connectedTo, Quality Planning>
+<Continuous Improvement, connectedTo, Supplier Audits>
+<Corrective and Preventive Actions, connectedTo, Supplier Audits>
+<Customer Feedback Analysis, connectedTo, Food Safety Quality Control>
+<Defect Detection, connectedTo, Root Cause Analysis>
+<Hardware Quality Testing, connectedTo, Audit Planning>
+<ISO Certification, connectedTo, Non_Destructive Testing>
+<Inspection Procedures, connectedTo, Lean Principles in Quality>
+<Inspection Procedures, connectedTo, Process Monitoring>
+<Lean Principles in Quality, connectedTo, Statistical Process Control>
+<Non_Conformance Management, connectedTo, Process Monitoring>
+<Non_Destructive Testing, connectedTo, Process Monitoring>
+<Process Monitoring, connectedTo, Trend Analysis>
+<Quality Control Tools, connectedTo, Quality Planning>
+<Quality Data Analysis, connectedTo, Corrective and Preventive Actions>
+<Quality Management Systems, connectedTo, Non_Conformance Management>
+<Quality Management Systems, connectedTo, Process Monitoring>
+<Quality Management Systems, connectedTo, Quality Control Tools>
+<Quality Management Systems, connectedTo, Supplier Audits>
+<Quality Planning, connectedTo, Customer Feedback Analysis>
+<Root Cause Analysis, connectedTo, Quality Management Systems>
+<Service Quality Management, connectedTo, Hardware Quality Testing>
+<Statistical Process Control, connectedTo, Defect Detection>
+<Statistical Process Control, connectedTo, Process Monitoring>
+<Supplier Audits, connectedTo, Service Quality Management>
+<Total Quality Management, connectedTo, ISO Certification>
+<Trend Analysis, connectedTo, Continuous Improvement>
+<Trend Analysis, connectedTo, Quality Data Analysis>
+<Trend Analysis, connectedTo, Total Quality Management>
diff --git a/test/diagrams/graph_hard/diagrams_338.dot b/test/diagrams/graph_hard/diagrams_338.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c9392749e1f9847568fcb6e2809a4af31707dff4
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_338.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=TB
+	N0 [label="X_ray Inspection" color="#FFCC7A" fillcolor="#FFF6D9" shape=document style=filled]
+	N1 [label="Trend Analysis" color="#FFCC7A" fillcolor="#FFF6D9" shape=diamond style=filled]
+	N2 [label="Audit Planning" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N3 [label="Supplier Audits" color="#CD8FF2" fillcolor="#ECCFF5" shape=database style=filled]
+	N4 [label="ISO Certification" color="#BCB88A" fillcolor="#F5F5DC" shape=preparation style=filled]
+	N5 [label="Service Quality Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=database style=filled]
+	N6 [label="Six Sigma Methodologies" color="#CD8FF2" fillcolor="#ECCFF5" shape=action style=filled]
+	N7 [label="Lean Principles in Quality" color="#FFCC7A" fillcolor="#FFF6D9" shape=rect style=filled]
+	N8 [label="Software Quality Assurance" color="#CD8FF2" fillcolor="#ECCFF5" shape=multipledocuments style=filled]
+	N9 [label="Hardware Quality Testing" color="#CD8FF2" fillcolor="#ECCFF5" shape=action style=filled]
+	N10 [label="Customer Feedback Analysis" color="#CD8FF2" fillcolor="#ECCFF5" shape=hexagon style=filled]
+	N11 [label="Calibration of Instruments" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N12 [label="Supplier Quality Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=preparation style=filled]
+	N13 [label="Inspection Procedures" color="#CD8FF2" fillcolor="#ECCFF5" shape=inputoutput style=filled]
+	N14 [label="Root Cause Analysis" color="#BCB88A" fillcolor="#F5F5DC" shape=document style=filled]
+	N15 [label="Statistical Process Control" color="#FFCC7A" fillcolor="#FFF6D9" shape=document style=filled]
+	S0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFCC7A" fillcolor="#FFF6D9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Metrology {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Metrology"
+		nest0_0 [label="Risk_Based Quality Control" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+		nest0_1 [label="Food Safety Quality Control" color="#FFCC7A" fillcolor="#FFF6D9" shape=parallelogram style=filled]
+		nest0_2 [label="Non_Conformance Management" color="#BCB88A" fillcolor="#F5F5DC" shape=rectangle style=filled]
+		nest0_3 [label="Quality Control Tools" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	}
+	subgraph cluster_Measurement System Analysis {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Measurement System Analysis"
+		nest1_0 [label="Quality Management Systems" color="#BCB88A" fillcolor="#F5F5DC" shape=multipledocuments style=filled]
+		nest1_1 [label="Quality Planning" color="#BCB88A" fillcolor="#F5F5DC" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#BCB88A" penwidth=1.5 style=dashed label="verifies" dir=forward]
+	N4 -> N5 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#CD8FF2" penwidth=1.5 style=dashed label="data_collects" dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFCC7A" penwidth=1.5 style=dashed label="corrective_actions_implements" dir=forward]
+	N9 -> N10 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest0_0 [color="#000000" penwidth=1.5 style=solid label="root_causes_analyzes" dir=forward]
+	nest0_3 -> N6 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N2 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N10 -> S0 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N3 -> S1 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N10 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_338.txt b/test/diagrams/graph_hard/diagrams_338.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8134d4b4443270a87b9b09b321e7ade911d2a5e0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_338.txt
@@ -0,0 +1,33 @@
+<Audit Planning, connectedTo, Supplier Audits>
+<Calibration of Instruments, connectedTo, Supplier Quality Management>
+<Customer Feedback Analysis, connectedTo, Calibration of Instruments>
+<Customer Feedback Analysis, connectedTo, Root Cause Analysis>
+<Customer Feedback Analysis, connectedTo, Supplier Quality Management>
+<Food Safety Quality Control, connectedTo, Non_Conformance Management>
+<Food Safety Quality Control, partOf, Food Safety Quality Control>
+<Hardware Quality Testing, connectedTo, Customer Feedback Analysis>
+<ISO Certification, connectedTo, Customer Feedback Analysis>
+<ISO Certification, connectedTo, Quality Management Systems>
+<ISO Certification, connectedTo, Service Quality Management>
+<Inspection Procedures, connectedTo, Root Cause Analysis>
+<Inspection Procedures, root_causes_analyzes, Risk_Based Quality Control>
+<Lean Principles in Quality, connectedTo, Software Quality Assurance>
+<Non_Conformance Management, connectedTo, Quality Control Tools>
+<Non_Conformance Management, partOf, Non_Conformance Management>
+<Quality Control Tools, connectedTo, Six Sigma Methodologies>
+<Quality Control Tools, partOf, Quality Control Tools>
+<Quality Management Systems, connectedTo, Quality Planning>
+<Quality Planning, connectedTo, Audit Planning>
+<Risk_Based Quality Control, connectedTo, Food Safety Quality Control>
+<Risk_Based Quality Control, partOf, Risk_Based Quality Control>
+<Root Cause Analysis, connectedTo, Statistical Process Control>
+<Service Quality Management, data_collects, Six Sigma Methodologies>
+<Six Sigma Methodologies, connectedTo, Lean Principles in Quality>
+<Software Quality Assurance, corrective_actions_implements, Hardware Quality Testing>
+<Supplier Audits, connectedTo, Inspection Procedures>
+<Supplier Audits, connectedTo, Software Quality Assurance>
+<Supplier Audits, verifies, ISO Certification>
+<Supplier Quality Management, connectedTo, Inspection Procedures>
+<Trend Analysis, connectedTo, Audit Planning>
+<X_ray Inspection, connectedTo, Customer Feedback Analysis>
+<X_ray Inspection, connectedTo, Trend Analysis>
diff --git a/test/diagrams/graph_hard/diagrams_339.dot b/test/diagrams/graph_hard/diagrams_339.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fb6a7c72c97f9dd5987d34dae42e19e4e7f8aa07
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_339.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=TB
+	N0 [label="Quality Data Analysis" color="#7E57C2" fillcolor="#EDE7F6" shape=preparation style=filled]
+	N1 [label="Sampling Plans" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N2 [label="Calibration of Instruments" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N3 [label="Six Sigma Methodologies" color="#7E57C2" fillcolor="#EDE7F6" shape=multipledocuments style=filled]
+	N4 [label="Automated Optical Inspection" color="#7E57C2" fillcolor="#EDE7F6" shape=rect style=filled]
+	N5 [label="Customer Feedback Analysis" color="#26A69A" fillcolor="#E0F2F1" shape=diamond style=filled]
+	N6 [label="Food Safety Quality Control" color="#26A69A" fillcolor="#E0F2F1" shape=action style=filled]
+	N7 [label="Software Quality Assurance" color="#C0CA33" fillcolor="#F9FBE7" shape=rect style=filled]
+	N8 [label="Non_Destructive Testing" color="#7E57C2" fillcolor="#EDE7F6" shape=multipledocuments style=filled]
+	N9 [label="Component Inspection" color="#C0CA33" fillcolor="#F9FBE7" shape=vnode_shape style=filled]
+	N10 [label="Root Cause Analysis" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N11 [label="Pharmaceutical Quality Control" color="#C0CA33" fillcolor="#F9FBE7" shape=vnode_shape style=filled]
+	N12 [label="Continuous Improvement" color="#7E57C2" fillcolor="#EDE7F6" shape=predefinedprocess style=filled]
+	N13 [label="Supplier Quality Management" color="#26A69A" fillcolor="#E0F2F1" shape=rect style=filled]
+	N14 [label="Regulatory Compliance for Quality" color="#C0CA33" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N15 [label="Process Monitoring" color="#26A69A" fillcolor="#E0F2F1" shape=predefinedprocess style=filled]
+	N16 [label="Total Quality Management" color="#26A69A" fillcolor="#E0F2F1" shape=inputoutput style=filled]
+	N17 [label="Inspection Procedures" color="#C0CA33" fillcolor="#F9FBE7" shape=vnode_shape style=filled]
+	N18 [label="Corrective and Preventive Actions" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	S0 [label="" color="#7E57C2" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#C0CA33" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#C0CA33" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#7E57C2" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#C0CA33" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_X_ray Inspection {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="X_ray Inspection"
+		nest0_0 [label="Testing Methods" color="#C0CA33" fillcolor="#F9FBE7" shape=rect style=filled]
+		nest0_1 [label="Quality Planning" color="#C0CA33" fillcolor="#F9FBE7" shape=preparation style=filled]
+	}
+	subgraph cluster_Supplier Audits {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Supplier Audits"
+		nest1_0 [label="Quality Assurance" color="#7E57C2" fillcolor="#EDE7F6" shape=action style=filled]
+		nest1_1 [label="Measurement System Analysis" color="#C0CA33" fillcolor="#F9FBE7" shape=preparation style=filled]
+		nest1_2 [label="Quality Standards Development" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N17 -> N18 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N15 -> nest0_0 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N14 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N14 -> nest1_0 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N15 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N15 -> S0 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	S0 -> N18 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	S0 -> N17 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N10 -> S1 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#000000" penwidth=1.5 style=solid label="certifies" dir=forward]
+	S1 -> N13 [color="#7E57C2" penwidth=1.5 style=dashed label="personnel_trains" dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N10 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> M1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N11 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N6 -> M2 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N9 -> M2 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_339.txt b/test/diagrams/graph_hard/diagrams_339.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d6ae91522eadc3f015ed6069cfaf0f28caeb4836
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_339.txt
@@ -0,0 +1,35 @@
+<Automated Optical Inspection, connectedTo, Customer Feedback Analysis>
+<Automated Optical Inspection, connectedTo, Root Cause Analysis>
+<Calibration of Instruments, connectedTo, Six Sigma Methodologies>
+<Component Inspection, connectedTo, Regulatory Compliance for Quality>
+<Component Inspection, connectedTo, Root Cause Analysis>
+<Continuous Improvement, connectedTo, Supplier Quality Management>
+<Customer Feedback Analysis, connectedTo, Food Safety Quality Control>
+<Customer Feedback Analysis, connectedTo, Pharmaceutical Quality Control>
+<Food Safety Quality Control, connectedTo, Regulatory Compliance for Quality>
+<Food Safety Quality Control, connectedTo, Software Quality Assurance>
+<Inspection Procedures, connectedTo, Corrective and Preventive Actions>
+<Measurement System Analysis, connectedTo, Quality Standards Development>
+<Non_Destructive Testing, connectedTo, Component Inspection>
+<Pharmaceutical Quality Control, connectedTo, Continuous Improvement>
+<Process Monitoring, connectedTo, Corrective and Preventive Actions>
+<Process Monitoring, connectedTo, Inspection Procedures>
+<Process Monitoring, connectedTo, Testing Methods>
+<Process Monitoring, connectedTo, Total Quality Management>
+<Quality Assurance, connectedTo, Measurement System Analysis>
+<Quality Data Analysis, connectedTo, Sampling Plans>
+<Quality Planning, connectedTo, Regulatory Compliance for Quality>
+<Quality Standards Development, connectedTo, Process Monitoring>
+<Regulatory Compliance for Quality, connectedTo, Process Monitoring>
+<Regulatory Compliance for Quality, connectedTo, Quality Assurance>
+<Root Cause Analysis, certifies, Regulatory Compliance for Quality>
+<Root Cause Analysis, connectedTo, Pharmaceutical Quality Control>
+<Root Cause Analysis, personnel_trains, Supplier Quality Management>
+<Sampling Plans, connectedTo, Calibration of Instruments>
+<Six Sigma Methodologies, connectedTo, Automated Optical Inspection>
+<Six Sigma Methodologies, connectedTo, Root Cause Analysis>
+<Software Quality Assurance, connectedTo, Non_Destructive Testing>
+<Software Quality Assurance, connectedTo, Pharmaceutical Quality Control>
+<Supplier Quality Management, connectedTo, Regulatory Compliance for Quality>
+<Testing Methods, connectedTo, Quality Planning>
+<Total Quality Management, connectedTo, Inspection Procedures>
diff --git a/test/diagrams/graph_hard/diagrams_34.txt b/test/diagrams/graph_hard/diagrams_34.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9e9c8dd0a5251d7c60c723de10ccd70ccbe31ee1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_34.txt
@@ -0,0 +1,28 @@
+<Custom Tour Package Creation, connectedTo, Travel Blog Creation>
+<Event Reservation, connectedTo, Flight Booking>
+<Flight Booking, connectedTo, Passport Renewal Assistance>
+<Historical Site Exploration, connectedTo, Group Tour Coordination>
+<Hotel Check_in, connectedTo, Custom Tour Package Creation>
+<Hotel Check_in, connectedTo, Group Tour Coordination>
+<Hotel Check_in, connectedTo, Historical Site Exploration>
+<Hotel Check_in, connectedTo, Language Translation Service>
+<Hotel Check_in, connectedTo, Tourist Information Desk>
+<Itinerary Planning, automates, Event Reservation>
+<Language Translation Service, connectedTo, Historical Site Exploration>
+<Language Translation Service, connectedTo, Itinerary Planning>
+<Language Translation Service, connectedTo, Tourist Information Desk>
+<Lost and Found Service, connectedTo, Group Tour Coordination>
+<Lost and Found Service, connectedTo, Historical Site Exploration>
+<Loyalty Program Enrollment, connectedTo, Group Tour Coordination>
+<Loyalty Program Enrollment, connectedTo, Historical Site Exploration>
+<Loyalty Program Enrollment, entertains, Lost and Found Service>
+<Loyalty Program Enrollment, promotes, Historical Site Exploration>
+<Passport Renewal Assistance, connectedTo, Lost and Found Service>
+<Tourist Information Desk, connectedTo, Group Tour Coordination>
+<Tourist Information Desk, connectedTo, Loyalty Program Enrollment>
+<Travel Blog Creation, connectedTo, Trip Sharing>
+<Trip Sharing, connectedTo, Hotel Check_in>
+<Visa Application, connectedTo, Group Tour Coordination>
+<Visa Application, connectedTo, Historical Site Exploration>
+<Visa Application, connectedTo, Hotel Check_in>
+<Visa Application, connectedTo, Tourist Information Desk>
diff --git a/test/diagrams/graph_hard/diagrams_340.dot b/test/diagrams/graph_hard/diagrams_340.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4bc7f43b56c73f17d400f4356eda405b4f2f54c3
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_340.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=TB
+	N0 [label="Project Management" color="#E91E63" fillcolor="#F8BBD0" shape=parallelogram style=filled]
+	N1 [label="Business Process Re_engineering" color="#FF5722" fillcolor="#FFCCBC" shape=action style=filled]
+	N2 [label="Testing ERP Modules" color="#CFCFCF" fillcolor="#F6F6F6" shape=parallelogram style=filled]
+	N3 [label="User Training" color="#CFCFCF" fillcolor="#F6F6F6" shape=database style=filled]
+	N4 [label="On_Premise ERP Solutions" color="#CFCFCF" fillcolor="#F6F6F6" shape=diamond style=filled]
+	N5 [label="Troubleshooting and Support" color="#E91E63" fillcolor="#F8BBD0" shape=document style=filled]
+	N6 [label="Vendor Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=diamond style=filled]
+	N7 [label="Asset Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+	N8 [label="Human Capital Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=action style=filled]
+	N9 [label="Cloud ERP Deployment" color="#CFCFCF" fillcolor="#F6F6F6" shape=parallelogram style=filled]
+	N10 [label="Post_Go_Live Support" color="#CFCFCF" fillcolor="#F6F6F6" shape=parallelogram style=filled]
+	N11 [label="Master Data Management" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N12 [label="Manufacturing Operations" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N13 [label="System Upgrade" color="#E91E63" fillcolor="#F8BBD0" shape=inputoutput style=filled]
+	N14 [label="Mobile ERP Access" color="#E91E63" fillcolor="#F8BBD0" shape=diamond style=filled]
+	N15 [label="Performance Optimization" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+	N16 [label="Sales and Distribution" color="#FF5722" fillcolor="#FFCCBC" shape=database style=filled]
+	S0 [label="" color="#FF5722" fillcolor="#FFCCBC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FF5722" fillcolor="#FFCCBC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FF5722" fillcolor="#FFCCBC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Procurement Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Procurement Management"
+		nest0_0 [label="Compliance Reporting" color="#CFCFCF" fillcolor="#F6F6F6" shape=document style=filled]
+		nest0_1 [label="Integration with Other Systems" color="#E91E63" fillcolor="#F8BBD0" shape=diamond style=filled]
+		nest0_2 [label="Business Intelligence Integration" color="#E91E63" fillcolor="#F8BBD0" shape=inputoutput style=filled]
+		nest0_3 [label="Security Management" color="#FF5722" fillcolor="#FFCCBC" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Data Governance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Data Governance"
+		nest1_0 [label="Financial Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=document style=filled]
+		nest1_1 [label="User Access Management" color="#E91E63" fillcolor="#F8BBD0" shape=document style=filled]
+	}
+	N0 -> N1 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FF5722" penwidth=1.5 style=solid label="upgrades" dir=forward]
+	N5 -> N6 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#CFCFCF" penwidth=1.5 style=dashed label="consults" dir=forward]
+	N7 -> N8 [color="#E91E63" penwidth=1.5 style=solid label="complies" dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N2 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N11 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N16 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N9 -> S1 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	S1 -> N15 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	S1 -> N16 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N8 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N9 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_340.txt b/test/diagrams/graph_hard/diagrams_340.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bd8ed752c295cfcf84b6eecb807df0a920ddb6f7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_340.txt
@@ -0,0 +1,34 @@
+<Asset Management, complies, Human Capital Management>
+<Business Intelligence Integration, connectedTo, Security Management>
+<Business Process Re_engineering, connectedTo, Cloud ERP Deployment>
+<Business Process Re_engineering, connectedTo, Testing ERP Modules>
+<Cloud ERP Deployment, connectedTo, Compliance Reporting>
+<Cloud ERP Deployment, connectedTo, Mobile ERP Access>
+<Cloud ERP Deployment, connectedTo, Performance Optimization>
+<Cloud ERP Deployment, connectedTo, Post_Go_Live Support>
+<Cloud ERP Deployment, connectedTo, Sales and Distribution>
+<Compliance Reporting, connectedTo, Integration with Other Systems>
+<Financial Management, connectedTo, User Access Management>
+<Human Capital Management, connectedTo, Cloud ERP Deployment>
+<Integration with Other Systems, connectedTo, Business Intelligence Integration>
+<Manufacturing Operations, connectedTo, System Upgrade>
+<Master Data Management, connectedTo, Financial Management>
+<Master Data Management, connectedTo, Manufacturing Operations>
+<Mobile ERP Access, connectedTo, Performance Optimization>
+<On_Premise ERP Solutions, upgrades, Troubleshooting and Support>
+<Performance Optimization, connectedTo, Sales and Distribution>
+<Post_Go_Live Support, connectedTo, Master Data Management>
+<Project Management, connectedTo, Business Process Re_engineering>
+<Project Management, connectedTo, Human Capital Management>
+<Security Management, connectedTo, Testing ERP Modules>
+<System Upgrade, connectedTo, Mobile ERP Access>
+<Testing ERP Modules, connectedTo, User Training>
+<Troubleshooting and Support, connectedTo, Human Capital Management>
+<Troubleshooting and Support, connectedTo, Vendor Management>
+<User Access Management, connectedTo, Sales and Distribution>
+<User Training, connectedTo, Manufacturing Operations>
+<User Training, connectedTo, On_Premise ERP Solutions>
+<User Training, connectedTo, Performance Optimization>
+<User Training, connectedTo, System Upgrade>
+<Vendor Management, connectedTo, Cloud ERP Deployment>
+<Vendor Management, consults, Asset Management>
diff --git a/test/diagrams/graph_hard/diagrams_341.dot b/test/diagrams/graph_hard/diagrams_341.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ff30f940cd3987b04fbdd7203d1e31ecd76b7cea
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_341.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=LR
+	N0 [label="Financial Management" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N1 [label="User Training" color="#94C0C0" fillcolor="#CADEDE" shape=document style=filled]
+	N2 [label="Asset Management" color="#A188D0" fillcolor="#DACBE3" shape=inputoutput style=filled]
+	N3 [label="Cloud ERP Deployment" color="#94C0C0" fillcolor="#CADEDE" shape=multipledocuments style=filled]
+	N4 [label="User Acceptance Testing" color="#94C0C0" fillcolor="#CADEDE" shape=parallelogram style=filled]
+	N5 [label="Module Implementation" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+	N6 [label="ERP Consulting" color="#A188D0" fillcolor="#DACBE3" shape=database style=filled]
+	N7 [label="Human Capital Management" color="#00BCD4" fillcolor="#B2EBF2" shape=document style=filled]
+	N8 [label="Supply Chain Management" color="#A188D0" fillcolor="#DACBE3" shape=rect style=filled]
+	N9 [label="On_Premise ERP Solutions" color="#00BCD4" fillcolor="#B2EBF2" shape=diamond style=filled]
+	N10 [label="Implementation Roadmap Development" color="#00BCD4" fillcolor="#B2EBF2" shape=vnode_shape style=filled]
+	N11 [label="Security Management" color="#94C0C0" fillcolor="#CADEDE" shape=vnode_shape style=filled]
+	N12 [label="Procurement Management" color="#A188D0" fillcolor="#DACBE3" shape=multipledocuments style=filled]
+	N13 [label="Business Intelligence Integration" color="#94C0C0" fillcolor="#CADEDE" shape=rect style=filled]
+	N14 [label="Manufacturing Operations" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+	N15 [label="Project Management" color="#A188D0" fillcolor="#DACBE3" shape=rect style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#94C0C0" fillcolor="#CADEDE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#94C0C0" fillcolor="#CADEDE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Data Governance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Data Governance"
+		nest0_0 [label="AI or ML in ERP" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+		nest0_1 [label="System Upgrade" color="#00BCD4" fillcolor="#B2EBF2" shape=action style=filled]
+	}
+	subgraph cluster_Customer Relationship Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Customer Relationship Management"
+		nest1_0 [label="Integration with Other Systems" color="#94C0C0" fillcolor="#CADEDE" shape=preparation style=filled]
+		nest1_1 [label="Sales and Distribution" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	}
+	N0 -> N1 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#00BCD4" penwidth=1.5 style=dashed label="audits" dir=forward]
+	N6 -> N7 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N10 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N5 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N7 -> S2 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	S2 -> N14 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M1 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	M1 -> N11 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_341.txt b/test/diagrams/graph_hard/diagrams_341.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a19a212a2ad3688e2a09a8045f6fb32f7f071fdb
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_341.txt
@@ -0,0 +1,31 @@
+<AI or ML in ERP, connectedTo, System Upgrade>
+<Asset Management, connectedTo, Business Intelligence Integration>
+<Asset Management, connectedTo, Cloud ERP Deployment>
+<Asset Management, connectedTo, ERP Consulting>
+<Asset Management, connectedTo, Integration with Other Systems>
+<Asset Management, connectedTo, On_Premise ERP Solutions>
+<Business Intelligence Integration, connectedTo, Manufacturing Operations>
+<Cloud ERP Deployment, connectedTo, User Acceptance Testing>
+<ERP Consulting, connectedTo, Human Capital Management>
+<Financial Management, connectedTo, User Training>
+<Human Capital Management, connectedTo, Implementation Roadmap Development>
+<Human Capital Management, connectedTo, Manufacturing Operations>
+<Human Capital Management, connectedTo, Supply Chain Management>
+<Implementation Roadmap Development, connectedTo, Security Management>
+<Integration with Other Systems, connectedTo, Sales and Distribution>
+<Manufacturing Operations, connectedTo, Project Management>
+<Module Implementation, audits, ERP Consulting>
+<Module Implementation, connectedTo, Implementation Roadmap Development>
+<Module Implementation, connectedTo, Manufacturing Operations>
+<Module Implementation, connectedTo, Security Management>
+<On_Premise ERP Solutions, connectedTo, Implementation Roadmap Development>
+<On_Premise ERP Solutions, connectedTo, Security Management>
+<Procurement Management, connectedTo, Business Intelligence Integration>
+<Sales and Distribution, connectedTo, Module Implementation>
+<Security Management, connectedTo, Procurement Management>
+<Supply Chain Management, connectedTo, On_Premise ERP Solutions>
+<System Upgrade, connectedTo, Implementation Roadmap Development>
+<User Acceptance Testing, connectedTo, Module Implementation>
+<User Training, connectedTo, AI or ML in ERP>
+<User Training, connectedTo, Asset Management>
+<User Training, connectedTo, Security Management>
diff --git a/test/diagrams/graph_hard/diagrams_342.dot b/test/diagrams/graph_hard/diagrams_342.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9ed0650e8934719d8a05fb2eca482431fb78c3a1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_342.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=LR
+	N0 [label="Mobile ERP Access" color="#FFF176" fillcolor="#FFFDE7" shape=database style=filled]
+	N1 [label="User Access Management" color="#DCE775" fillcolor="#F9FBE7" shape=rect style=filled]
+	N2 [label="Human Capital Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=rectangle style=filled]
+	N3 [label="Project Management" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N4 [label="Customer Relationship Management" color="#FFF176" fillcolor="#FFFDE7" shape=database style=filled]
+	N5 [label="System Upgrade" color="#C2B2F0" fillcolor="#EFE6FF" shape=action style=filled]
+	N6 [label="Cloud ERP Deployment" color="#C2B2F0" fillcolor="#EFE6FF" shape=preparation style=filled]
+	N7 [label="AI or ML in ERP" color="#DCE775" fillcolor="#F9FBE7" shape=database style=filled]
+	N8 [label="Master Data Management" color="#FFF176" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+	N9 [label="ERP Consulting" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N10 [label="Hybrid ERP Models" color="#FFF176" fillcolor="#FFFDE7" shape=rect style=filled]
+	N11 [label="System Configuration" color="#DCE775" fillcolor="#F9FBE7" shape=document style=filled]
+	N12 [label="Supply Chain Management" color="#DCE775" fillcolor="#F9FBE7" shape=preparation style=filled]
+	N13 [label="Data Migration" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N14 [label="Asset Management" color="#DCE775" fillcolor="#F9FBE7" shape=rectangle style=filled]
+	N15 [label="User Training" color="#FFF176" fillcolor="#FFFDE7" shape=document style=filled]
+	N16 [label="Inventory Management" color="#DCE775" fillcolor="#F9FBE7" shape=inputoutput style=filled]
+	S0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Data Governance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Data Governance"
+		nest0_0 [label="ERP System Selection" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_1 [label="Module Implementation" color="#FFF176" fillcolor="#FFFDE7" shape=rectangle style=filled]
+		nest0_2 [label="Procurement Management" color="#FFF176" fillcolor="#FFFDE7" shape=database style=filled]
+		nest0_3 [label="Troubleshooting and Support" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	}
+	subgraph cluster_Financial Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Financial Management"
+		nest1_0 [label="Compliance Reporting" color="#C2B2F0" fillcolor="#EFE6FF" shape=rect style=filled]
+		nest1_1 [label="Post_Go_Live Support" color="#C2B2F0" fillcolor="#EFE6FF" shape=multipledocuments style=filled]
+		nest1_2 [label="On_Premise ERP Solutions" color="#C2B2F0" fillcolor="#EFE6FF" shape=predefinedprocess style=filled]
+		nest1_3 [label="Testing ERP Modules" color="#DCE775" fillcolor="#F9FBE7" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#C2B2F0" penwidth=1.5 style=dashed label="secures" dir=forward]
+	N3 -> N4 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#C2B2F0" penwidth=1.5 style=dashed label="consults" dir=forward]
+	N12 -> N13 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N1 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FFF176" penwidth=1.5 style=dashed label="manages" dir=forward]
+	nest1_1 -> nest1_2 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest1_0 [color="#000000" penwidth=1.5 style=solid label="sales_manages" dir=forward]
+	nest1_3 -> N2 [color="#DCE775" penwidth=1.5 style=solid label="data_centralizes" dir=forward]
+	N0 -> S0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N16 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N6 -> S2 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	S2 -> N9 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#000000" penwidth=1.5 style=dashed label="procurements_handles" dir=forward]
+	N4 -> M0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M0 [color="#FFF176" penwidth=1.5 style=dashed label="protects" dir=forward]
+	N13 -> M0 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	M0 -> N16 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	M1 -> N8 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_342.txt b/test/diagrams/graph_hard/diagrams_342.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1999ca3c824acfb2f6cf8b7545e1d9d16d387919
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_342.txt
@@ -0,0 +1,39 @@
+<AI or ML in ERP, connectedTo, ERP System Selection>
+<AI or ML in ERP, connectedTo, Master Data Management>
+<AI or ML in ERP, sales_manages, Compliance Reporting>
+<Asset Management, connectedTo, User Training>
+<Cloud ERP Deployment, connectedTo, AI or ML in ERP>
+<Cloud ERP Deployment, connectedTo, ERP Consulting>
+<Cloud ERP Deployment, procurements_handles, Hybrid ERP Models>
+<Compliance Reporting, manages, Post_Go_Live Support>
+<Customer Relationship Management, connectedTo, Inventory Management>
+<Customer Relationship Management, connectedTo, System Upgrade>
+<Data Migration, connectedTo, Asset Management>
+<Data Migration, connectedTo, Inventory Management>
+<ERP Consulting, connectedTo, Hybrid ERP Models>
+<ERP Consulting, protects, Inventory Management>
+<ERP System Selection, connectedTo, Module Implementation>
+<Human Capital Management, connectedTo, AI or ML in ERP>
+<Human Capital Management, connectedTo, Asset Management>
+<Human Capital Management, connectedTo, ERP Consulting>
+<Human Capital Management, connectedTo, Inventory Management>
+<Human Capital Management, secures, Project Management>
+<Hybrid ERP Models, connectedTo, System Configuration>
+<Master Data Management, connectedTo, ERP Consulting>
+<Mobile ERP Access, connectedTo, Master Data Management>
+<Mobile ERP Access, connectedTo, System Configuration>
+<Mobile ERP Access, connectedTo, User Access Management>
+<Mobile ERP Access, connectedTo, User Training>
+<Module Implementation, connectedTo, Procurement Management>
+<On_Premise ERP Solutions, connectedTo, Testing ERP Modules>
+<Post_Go_Live Support, connectedTo, On_Premise ERP Solutions>
+<Procurement Management, connectedTo, Troubleshooting and Support>
+<Project Management, connectedTo, Customer Relationship Management>
+<Supply Chain Management, connectedTo, Data Migration>
+<System Configuration, consults, Supply Chain Management>
+<System Upgrade, connectedTo, Cloud ERP Deployment>
+<System Upgrade, connectedTo, Master Data Management>
+<Testing ERP Modules, data_centralizes, Human Capital Management>
+<Troubleshooting and Support, connectedTo, User Access Management>
+<User Access Management, connectedTo, Human Capital Management>
+<User Training, connectedTo, Inventory Management>
diff --git a/test/diagrams/graph_hard/diagrams_343.dot b/test/diagrams/graph_hard/diagrams_343.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8a390f90d4553941e430b37187a1254184c0becd
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_343.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=LR
+	N0 [label="Decision Support Systems for Farmers" color="#7E57C2" fillcolor="#D1C4E9" shape=preparation style=filled]
+	N1 [label="Satellite Imaging" color="#4DD0E1" fillcolor="#C9F0F0" shape=vnode_shape style=filled]
+	N2 [label="AI for Crop Disease Detection" color="#7E57C2" fillcolor="#D1C4E9" shape=vnode_shape style=filled]
+	N3 [label="Herd Health Monitoring" color="#4DD0E1" fillcolor="#C9F0F0" shape=predefinedprocess style=filled]
+	N4 [label="Forestry Management with Digital Tools" color="#AF56A6" fillcolor="#DDCEDD" shape=database style=filled]
+	N5 [label="Sensor Deployment" color="#4DD0E1" fillcolor="#C9F0F0" shape=document style=filled]
+	N6 [label="Resource Optimization" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+	N7 [label="Blockchain for Agri_Supply Chain" color="#AF56A6" fillcolor="#DDCEDD" shape=predefinedprocess style=filled]
+	N8 [label="Digital Agronomy" color="#7E57C2" fillcolor="#D1C4E9" shape=inputoutput style=filled]
+	N9 [label="Farm Management Dashboards" color="#4DD0E1" fillcolor="#C9F0F0" shape=preparation style=filled]
+	N10 [label="Farm Management Software" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N11 [label="Weather Station Data Integration" color="#AF56A6" fillcolor="#DDCEDD" shape=inputoutput style=filled]
+	N12 [label="Farm Data Integration" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N13 [label="Variable Rate Application" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N14 [label="Automated Irrigation" color="#AF56A6" fillcolor="#DDCEDD" shape=action style=filled]
+	N15 [label="Farm Robotics" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	S0 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#4DD0E1" fillcolor="#C9F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#4DD0E1" fillcolor="#C9F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Carbon Farming Initiatives {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Carbon Farming Initiatives"
+		nest0_0 [label="Market Price Forecasting" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+		nest0_1 [label="Sustainability Metrics Tracking" color="#7E57C2" fillcolor="#D1C4E9" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Farm Labor Management Software {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Farm Labor Management Software"
+		nest1_0 [label="Smart Greenhouses" color="#4DD0E1" fillcolor="#C9F0F0" shape=parallelogram style=filled]
+		nest1_1 [label="Smart Livestock Monitoring" color="#AF56A6" fillcolor="#DDCEDD" shape=inputoutput style=filled]
+		nest1_2 [label="Geographic Information Systems for Farms" color="#4DD0E1" fillcolor="#C9F0F0" shape=document style=filled]
+	}
+	N0 -> N1 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#7E57C2" penwidth=1.5 style=dashed label="resource_efficiency_improves" dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest0_0 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N6 [color="#7E57C2" penwidth=1.5 style=dashed label="produces_safely" dir=forward]
+	nest1_0 -> nest1_1 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest1_0 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> S0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S1 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> S2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#4DD0E1" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	N7 -> M1 [color="#4DD0E1" penwidth=1.5 style=solid dir=forward]
+	M1 -> N15 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N10 -> M2 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	M2 -> N12 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_343.txt b/test/diagrams/graph_hard/diagrams_343.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c6f5e89f9d445e05a249c43f5a7775c5338d1a7d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_343.txt
@@ -0,0 +1,33 @@
+<AI for Crop Disease Detection, connectedTo, Digital Agronomy>
+<AI for Crop Disease Detection, connectedTo, Farm Management Software>
+<AI for Crop Disease Detection, connectedTo, Herd Health Monitoring>
+<Automated Irrigation, connectedTo, Farm Robotics>
+<Blockchain for Agri_Supply Chain, connectedTo, Digital Agronomy>
+<Blockchain for Agri_Supply Chain, connectedTo, Farm Robotics>
+<Decision Support Systems for Farmers, connectedTo, Satellite Imaging>
+<Digital Agronomy, connectedTo, Automated Irrigation>
+<Digital Agronomy, connectedTo, Farm Management Dashboards>
+<Digital Agronomy, connectedTo, Farm Management Software>
+<Farm Data Integration, resource_efficiency_improves, Variable Rate Application>
+<Farm Management Dashboards, connectedTo, Farm Management Software>
+<Farm Management Software, connectedTo, Farm Data Integration>
+<Farm Management Software, connectedTo, Market Price Forecasting>
+<Farm Management Software, connectedTo, Weather Station Data Integration>
+<Forestry Management with Digital Tools, connectedTo, Farm Data Integration>
+<Forestry Management with Digital Tools, connectedTo, Sensor Deployment>
+<Geographic Information Systems for Farms, connectedTo, Forestry Management with Digital Tools>
+<Herd Health Monitoring, connectedTo, Forestry Management with Digital Tools>
+<Market Price Forecasting, connectedTo, Sustainability Metrics Tracking>
+<Resource Optimization, connectedTo, Blockchain for Agri_Supply Chain>
+<Resource Optimization, connectedTo, Smart Greenhouses>
+<Satellite Imaging, connectedTo, AI for Crop Disease Detection>
+<Sensor Deployment, connectedTo, Farm Robotics>
+<Sensor Deployment, connectedTo, Resource Optimization>
+<Smart Greenhouses, connectedTo, Smart Livestock Monitoring>
+<Smart Livestock Monitoring, connectedTo, Geographic Information Systems for Farms>
+<Sustainability Metrics Tracking, produces_safely, Resource Optimization>
+<Variable Rate Application, connectedTo, Automated Irrigation>
+<Weather Station Data Integration, connectedTo, Automated Irrigation>
+<Weather Station Data Integration, connectedTo, Farm Data Integration>
+<Weather Station Data Integration, connectedTo, Farm Robotics>
+<Weather Station Data Integration, connectedTo, Variable Rate Application>
diff --git a/test/diagrams/graph_hard/diagrams_344.dot b/test/diagrams/graph_hard/diagrams_344.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2b80d2d4a24a39ee4b2d1ffabba91b7153f502d8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_344.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=RL
+	N0 [label="Digital Soil Mapping" color="#607D8B" fillcolor="#CFD8DC" shape=vnode_shape style=filled]
+	N1 [label="Resource Optimization" color="#607D8B" fillcolor="#CFD8DC" shape=diamond style=filled]
+	N2 [label="Variable Rate Application" color="#94C0C0" fillcolor="#CADEDE" shape=inputoutput style=filled]
+	N3 [label="Crop Health Monitoring" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N4 [label="Vertical Farming Technology" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N5 [label="Data Security in Agriculture" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N6 [label="Drone Monitoring" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+	N7 [label="Geographic Information Systems for Farms" color="#607D8B" fillcolor="#CFD8DC" shape=multipledocuments style=filled]
+	N8 [label="Farm Labor Management Software" color="#607D8B" fillcolor="#CFD8DC" shape=rectangle style=filled]
+	N9 [label="Weather Station Data Integration" color="#CFCFCF" fillcolor="#F6F6F6" shape=document style=filled]
+	N10 [label="Livestock Feeding Automation" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N11 [label="Predictive Analytics for Harvest" color="#94C0C0" fillcolor="#CADEDE" shape=database style=filled]
+	N12 [label="Big Data Analytics for Farms" color="#94C0C0" fillcolor="#CADEDE" shape=action style=filled]
+	S0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Smart Livestock Monitoring {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Smart Livestock Monitoring"
+		nest0_0 [label="Farm Management Dashboards" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+		nest0_1 [label="Aquaculture Monitoring" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+		nest0_2 [label="Satellite Imaging" color="#CFCFCF" fillcolor="#F6F6F6" shape=action style=filled]
+	}
+	subgraph cluster_IoT in Agriculture {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="IoT in Agriculture"
+		nest1_0 [label="Blockchain for Agri_Supply Chain" color="#CFCFCF" fillcolor="#F6F6F6" shape=diamond style=filled]
+		nest1_1 [label="Smart Greenhouses" color="#94C0C0" fillcolor="#CADEDE" shape=parallelogram style=filled]
+		nest1_2 [label="Sustainability Metrics Tracking" color="#CFCFCF" fillcolor="#F6F6F6" shape=database style=filled]
+	}
+	N0 -> N1 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#607D8B" penwidth=1.5 style=dashed label="guides" dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid label="monitors" dir=forward]
+	N6 -> N7 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#94C0C0" penwidth=1.5 style=dashed label="drones_uses" dir=forward]
+	N11 -> N12 [color="#CFCFCF" penwidth=1.5 style=dashed label="waters" dir=forward]
+	nest0_0 -> nest0_1 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N3 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S0 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#607D8B" penwidth=1.5 style=dashed label="complies" dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N5 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	M1 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_345.dot b/test/diagrams/graph_hard/diagrams_345.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8056ab15a0518967adac6f72626cd8915ca9e5f2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_345.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=LR
+	N0 [label="Livestock Feeding Automation" color="#C2B2F0" fillcolor="#EFE6FF" shape=multipledocuments style=filled]
+	N1 [label="Digital Agronomy" color="#C2B2F0" fillcolor="#EFE6FF" shape=rect style=filled]
+	N2 [label="Farm Labor Management Software" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N3 [label="Carbon Farming Initiatives" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	N4 [label="Yield Mapping" color="#26A69A" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N5 [label="Sustainability Metrics Tracking" color="#26A69A" fillcolor="#E0F2F1" shape=action style=filled]
+	N6 [label="Automated Farm Machinery" color="#26A69A" fillcolor="#E0F2F1" shape=multipledocuments style=filled]
+	N7 [label="Pest and Disease Management Systems" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N8 [label="IoT in Agriculture" color="#26A69A" fillcolor="#E0F2F1" shape=document style=filled]
+	N9 [label="Herd Health Monitoring" color="#A1D7CD" fillcolor="#EDF5F3" shape=parallelogram style=filled]
+	N10 [label="Automated Irrigation" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	S0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Farm Management Dashboards {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Farm Management Dashboards"
+		nest0_0 [label="Blockchain for Agri_Supply Chain" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+		nest0_1 [label="Weather Station Data Integration" color="#C2B2F0" fillcolor="#EFE6FF" shape=preparation style=filled]
+		nest0_2 [label="Precision Farming" color="#C2B2F0" fillcolor="#EFE6FF" shape=database style=filled]
+		nest0_3 [label="AI for Crop Disease Detection" color="#C2B2F0" fillcolor="#EFE6FF" shape=database style=filled]
+	}
+	subgraph cluster_Sensor Deployment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Sensor Deployment"
+		nest1_0 [label="Farm Robotics" color="#26A69A" fillcolor="#E0F2F1" shape=database style=filled]
+		nest1_1 [label="Predictive Analytics for Harvest" color="#C2B2F0" fillcolor="#EFE6FF" shape=database style=filled]
+	}
+	N0 -> N1 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed label="waste_reduces" dir=forward]
+	N8 -> N9 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest0_0 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N6 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest1_0 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S0 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	S0 -> N3 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_345.txt b/test/diagrams/graph_hard/diagrams_345.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c6ba8243d96e37d534cbbb4a05660e8b53327b56
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_345.txt
@@ -0,0 +1,25 @@
+<AI for Crop Disease Detection, connectedTo, Automated Farm Machinery>
+<Automated Farm Machinery, connectedTo, Pest and Disease Management Systems>
+<Blockchain for Agri_Supply Chain, connectedTo, Weather Station Data Integration>
+<Carbon Farming Initiatives, connectedTo, Automated Farm Machinery>
+<Carbon Farming Initiatives, connectedTo, Yield Mapping>
+<Digital Agronomy, connectedTo, Carbon Farming Initiatives>
+<Digital Agronomy, connectedTo, Farm Labor Management Software>
+<Digital Agronomy, connectedTo, IoT in Agriculture>
+<Farm Labor Management Software, connectedTo, Carbon Farming Initiatives>
+<Farm Robotics, connectedTo, Predictive Analytics for Harvest>
+<Herd Health Monitoring, connectedTo, Automated Irrigation>
+<Herd Health Monitoring, connectedTo, Blockchain for Agri_Supply Chain>
+<IoT in Agriculture, connectedTo, Herd Health Monitoring>
+<Livestock Feeding Automation, connectedTo, Digital Agronomy>
+<Pest and Disease Management Systems, waste_reduces, IoT in Agriculture>
+<Precision Farming, connectedTo, AI for Crop Disease Detection>
+<Predictive Analytics for Harvest, connectedTo, Pest and Disease Management Systems>
+<Sustainability Metrics Tracking, connectedTo, Automated Farm Machinery>
+<Sustainability Metrics Tracking, connectedTo, Automated Irrigation>
+<Sustainability Metrics Tracking, connectedTo, Farm Robotics>
+<Sustainability Metrics Tracking, connectedTo, IoT in Agriculture>
+<Sustainability Metrics Tracking, connectedTo, Pest and Disease Management Systems>
+<Weather Station Data Integration, connectedTo, Precision Farming>
+<Yield Mapping, connectedTo, Automated Farm Machinery>
+<Yield Mapping, connectedTo, Sustainability Metrics Tracking>
diff --git a/test/diagrams/graph_hard/diagrams_346.dot b/test/diagrams/graph_hard/diagrams_346.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8a9ff78f1931405220df49ee89521a295a526786
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_346.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=LR
+	N0 [label="Tournament Organization" color="#80DDEA" fillcolor="#D3F7F9" shape=parallelogram style=filled]
+	N1 [label="Venue Setup" color="#FFF8A6" fillcolor="#FFFDE0" shape=vnode_shape style=filled]
+	N2 [label="Player Contracts" color="#FBC02D" fillcolor="#FFFDE7" shape=multipledocuments style=filled]
+	N3 [label="Training Regimen" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N4 [label="Fan Community Building" color="#FBC02D" fillcolor="#FFFDE7" shape=multipledocuments style=filled]
+	N5 [label="Prize Pool Management" color="#FBC02D" fillcolor="#FFFDE7" shape=rectangle style=filled]
+	N6 [label="Nutrition for Esports Athletes" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N7 [label="Esports Team Ownership" color="#80DDEA" fillcolor="#D3F7F9" shape=diamond style=filled]
+	N8 [label="Talent Representation" color="#FFF8A6" fillcolor="#FFFDE0" shape=diamond style=filled]
+	N9 [label="Data Security for Competitions" color="#FFF8A6" fillcolor="#FFFDE0" shape=rect style=filled]
+	N10 [label="Game Publisher Relations" color="#80DDEA" fillcolor="#D3F7F9" shape=document style=filled]
+	N11 [label="Social Media Management" color="#FBC02D" fillcolor="#FFFDE7" shape=database style=filled]
+	N12 [label="Mental Health Support for Players" color="#FFF8A6" fillcolor="#FFFDE0" shape=predefinedprocess style=filled]
+	N13 [label="Performance Analysis" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N14 [label="Network Infrastructure for Tournaments" color="#80DDEA" fillcolor="#D3F7F9" shape=preparation style=filled]
+	N15 [label="Merchandise Sales" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	S1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Anti_Cheat Measures {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Anti_Cheat Measures"
+		nest0_0 [label="Team Management" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest0_1 [label="Rules and Regulations Enforcement" color="#FFF8A6" fillcolor="#FFFDE0" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Event Broadcasting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Event Broadcasting"
+		nest1_0 [label="Live Streaming Production" color="#FBC02D" fillcolor="#FFFDE7" shape=document style=filled]
+		nest1_1 [label="Coaching Staff Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=rect style=filled]
+		nest1_2 [label="Player Scouting" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest1_3 [label="Ticketing Sales" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	}
+	N0 -> N1 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#80DDEA" penwidth=1.5 style=solid label="financial_advises" dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid label="merchandise_sells" dir=forward]
+	N6 -> N7 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFF8A6" penwidth=1.5 style=solid label="recruits" dir=forward]
+	N9 -> N10 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#80DDEA" penwidth=1.5 style=dashed label="health_supports" dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N14 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N7 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N11 -> nest1_0 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N3 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S1 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=solid label="teams_forms" dir=forward]
+	N1 -> M1 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N4 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_3 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_347.dot b/test/diagrams/graph_hard/diagrams_347.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cf79ee110b66f3e6c2a0a7bf9b4b4ff7b1e61296
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_347.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=RL
+	N0 [label="Rules and Regulations Enforcement" color="#AABEC6" fillcolor="#E0E6E9" shape=rectangle style=filled]
+	N1 [label="Fan Community Building" color="#AABEC6" fillcolor="#E0E6E9" shape=predefinedprocess style=filled]
+	N2 [label="Broadcast Technology for Esports" color="#AABEC6" fillcolor="#E0E6E9" shape=vnode_shape style=filled]
+	N3 [label="Data Security for Competitions" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N4 [label="Game Publisher Relations" color="#AABEC6" fillcolor="#E0E6E9" shape=vnode_shape style=filled]
+	N5 [label="Event Broadcasting" color="#B8C0F5" fillcolor="#ECF0FD" shape=database style=filled]
+	N6 [label="Talent Representation" color="#AABEC6" fillcolor="#E0E6E9" shape=database style=filled]
+	N7 [label="Esports Analytics" color="#64B5F6" fillcolor="#E3F2FD" shape=rectangle style=filled]
+	N8 [label="Player Scouting" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+	N9 [label="Performance Analysis" color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+	N10 [label="Live Streaming Production" color="#AABEC6" fillcolor="#E0E6E9" shape=rectangle style=filled]
+	N11 [label="Brand Partnerships" color="#AABEC6" fillcolor="#E0E6E9" shape=action style=filled]
+	N12 [label="Ticketing Sales" color="#64B5F6" fillcolor="#E3F2FD" shape=document style=filled]
+	S0 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Prize Pool Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Prize Pool Management"
+		nest0_0 [label="Esports Team Ownership" color="#64B5F6" fillcolor="#E3F2FD" shape=action style=filled]
+		nest0_1 [label="Game Server Management" color="#64B5F6" fillcolor="#E3F2FD" shape=preparation style=filled]
+		nest0_2 [label="Coaching Staff Management" color="#B8C0F5" fillcolor="#ECF0FD" shape=vnode_shape style=filled]
+		nest0_3 [label="Nutrition for Esports Athletes" color="#64B5F6" fillcolor="#E3F2FD" shape=rectangle style=filled]
+	}
+	subgraph cluster_Content Creation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Content Creation"
+		nest1_0 [label="Sponsorship Acquisition" color="#B8C0F5" fillcolor="#ECF0FD" shape=preparation style=filled]
+		nest1_1 [label="Anti_Cheat Measures" color="#AABEC6" fillcolor="#E0E6E9" shape=rectangle style=filled]
+		nest1_2 [label="Gaming Hardware Optimization" color="#B8C0F5" fillcolor="#ECF0FD" shape=vnode_shape style=filled]
+		nest1_3 [label="Physical Conditioning for Players" color="#64B5F6" fillcolor="#E3F2FD" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#AABEC6" penwidth=1.5 style=solid label="recruits" dir=forward]
+	N5 -> N6 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid label="integrity_ensures" dir=forward]
+	N10 -> N11 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> nest0_0 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N4 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#64B5F6" penwidth=1.5 style=dashed label="performance_optimizes" dir=forward]
+	N8 -> nest1_0 [color="#64B5F6" penwidth=1.5 style=dashed label="merchandise_sells" dir=forward]
+	nest1_3 -> N4 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S1 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N5 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M2 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#B8C0F5" penwidth=1.5 style=solid label="tickets_sells" dir=forward]
+	M2 -> N9 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_347.txt b/test/diagrams/graph_hard/diagrams_347.txt
new file mode 100644
index 0000000000000000000000000000000000000000..60baef15015222b9983a92da2959600a9452e3b2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_347.txt
@@ -0,0 +1,36 @@
+<Anti_Cheat Measures, connectedTo, Gaming Hardware Optimization>
+<Brand Partnerships, connectedTo, Esports Team Ownership>
+<Brand Partnerships, connectedTo, Ticketing Sales>
+<Broadcast Technology for Esports, connectedTo, Data Security for Competitions>
+<Broadcast Technology for Esports, connectedTo, Talent Representation>
+<Broadcast Technology for Esports, tickets_sells, Performance Analysis>
+<Coaching Staff Management, connectedTo, Nutrition for Esports Athletes>
+<Data Security for Competitions, connectedTo, Esports Analytics>
+<Data Security for Competitions, connectedTo, Event Broadcasting>
+<Data Security for Competitions, connectedTo, Game Publisher Relations>
+<Data Security for Competitions, connectedTo, Performance Analysis>
+<Data Security for Competitions, connectedTo, Player Scouting>
+<Data Security for Competitions, connectedTo, Talent Representation>
+<Esports Analytics, connectedTo, Brand Partnerships>
+<Esports Analytics, connectedTo, Live Streaming Production>
+<Esports Analytics, connectedTo, Performance Analysis>
+<Esports Analytics, connectedTo, Player Scouting>
+<Esports Team Ownership, connectedTo, Game Server Management>
+<Event Broadcasting, connectedTo, Talent Representation>
+<Fan Community Building, connectedTo, Broadcast Technology for Esports>
+<Game Publisher Relations, connectedTo, Talent Representation>
+<Game Publisher Relations, recruits, Event Broadcasting>
+<Game Server Management, connectedTo, Coaching Staff Management>
+<Gaming Hardware Optimization, performance_optimizes, Physical Conditioning for Players>
+<Live Streaming Production, connectedTo, Brand Partnerships>
+<Nutrition for Esports Athletes, connectedTo, Game Publisher Relations>
+<Performance Analysis, integrity_ensures, Live Streaming Production>
+<Physical Conditioning for Players, connectedTo, Game Publisher Relations>
+<Player Scouting, connectedTo, Performance Analysis>
+<Player Scouting, merchandise_sells, Sponsorship Acquisition>
+<Rules and Regulations Enforcement, connectedTo, Event Broadcasting>
+<Rules and Regulations Enforcement, connectedTo, Fan Community Building>
+<Rules and Regulations Enforcement, connectedTo, Performance Analysis>
+<Rules and Regulations Enforcement, connectedTo, Talent Representation>
+<Sponsorship Acquisition, connectedTo, Anti_Cheat Measures>
+<Talent Representation, connectedTo, Esports Analytics>
diff --git a/test/diagrams/graph_hard/diagrams_348.txt b/test/diagrams/graph_hard/diagrams_348.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8cad154a23e4e7ee75485aad729b7c61e82c3295
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_348.txt
@@ -0,0 +1,28 @@
+<Anti_Cheat Measures, health_supports, Player Scouting>
+<Brand Partnerships, connectedTo, Media Rights Negotiation>
+<Brand Partnerships, connectedTo, Social Media Management>
+<Brand Partnerships, connectedTo, Ticketing Sales>
+<Brand Partnerships, develops_games, Coaching Staff Management>
+<Coaching Staff Management, connectedTo, Anti_Cheat Measures>
+<Fan Community Building, connectedTo, Gaming Hardware Optimization>
+<Fan Community Building, connectedTo, Social Media Management>
+<Game Publisher Relations, trains, Ticketing Sales>
+<Game Server Management, connectedTo, Fan Community Building>
+<Game Server Management, connectedTo, Social Media Management>
+<Game Server Management, connectedTo, Ticketing Sales>
+<Gaming Hardware Optimization, connectedTo, Brand Partnerships>
+<Gaming Hardware Optimization, connectedTo, Talent Representation>
+<Gaming Hardware Optimization, connectedTo, Training Regimen>
+<Gaming Hardware Optimization, connectedTo, Venue Setup>
+<Gaming Hardware Optimization, organizes, Game Publisher Relations>
+<Legal Advisory for Esports, connectedTo, Team Management>
+<Live Streaming Production, advertises, Legal Advisory for Esports>
+<Media Rights Negotiation, connectedTo, Live Streaming Production>
+<Player Scouting, connectedTo, Venue Setup>
+<Social Media Management, connectedTo, Game Publisher Relations>
+<Social Media Management, connectedTo, Ticketing Sales>
+<Talent Representation, connectedTo, Venue Setup>
+<Team Management, plays, Training Regimen>
+<Ticketing Sales, connectedTo, Talent Representation>
+<Training Regimen, connectedTo, Brand Partnerships>
+<Training Regimen, connectedTo, Social Media Management>
diff --git a/test/diagrams/graph_hard/diagrams_349.dot b/test/diagrams/graph_hard/diagrams_349.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9618f2b959fe7d463bc904aba4403c51938b364c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_349.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=TB
+	N0 [label="Aging Brain Research" color="#FFEB3B" fillcolor="#FFF9C4" shape=inputoutput style=filled]
+	N1 [label="Neurodegenerative Disease Research" color="#FFEB3B" fillcolor="#FFF9C4" shape=inputoutput style=filled]
+	N2 [label="Molecular Neuroscience" color="#3F51B5" fillcolor="#C5CAE9" shape=rect style=filled]
+	N3 [label="Electrophysiology" color="#DCE775" fillcolor="#FCFCE7" shape=database style=filled]
+	N4 [label="Memory Formation Research" color="#DCE775" fillcolor="#FCFCE7" shape=preparation style=filled]
+	N5 [label="Spike Train Analysis" color="#FFEB3B" fillcolor="#FFF9C4" shape=action style=filled]
+	N6 [label="Brain_Computer Interface" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+	N7 [label="Artificial Neural Networks Modeling" color="#DCE775" fillcolor="#FCFCE7" shape=rectangle style=filled]
+	S0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#FCFCE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#DCE775" fillcolor="#FCFCE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Cellular Neuroscience {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Cellular Neuroscience"
+		nest0_0 [label="Pain Perception Research" color="#3F51B5" fillcolor="#C5CAE9" shape=multipledocuments style=filled]
+		nest0_1 [label="Deep Brain Stimulation" color="#FFEB3B" fillcolor="#FFF9C4" shape=preparation style=filled]
+		nest0_2 [label="Cognitive Neuroscience" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+		nest0_3 [label="Genetic Basis of Brain Disorders" color="#DCE775" fillcolor="#FCFCE7" shape=document style=filled]
+	}
+	subgraph cluster_Developmental Neuroscience {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Developmental Neuroscience"
+		nest1_0 [label="Stem Cell Research" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+		nest1_1 [label="Motor Control Research" color="#FFEB3B" fillcolor="#FFF9C4" shape=rectangle style=filled]
+		nest1_2 [label="Neurotransmitter Research" color="#FFEB3B" fillcolor="#FFF9C4" shape=parallelogram style=filled]
+		nest1_3 [label="Systems Neuroscience" color="#3F51B5" fillcolor="#C5CAE9" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest0_0 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N3 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#FFEB3B" penwidth=1.5 style=solid label="translates" dir=forward]
+	M0 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	M1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	M2 -> N7 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_349.txt b/test/diagrams/graph_hard/diagrams_349.txt
new file mode 100644
index 0000000000000000000000000000000000000000..60850da8eaeb32af290c9890f3929ca6318993b0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_349.txt
@@ -0,0 +1,26 @@
+<Aging Brain Research, connectedTo, Memory Formation Research>
+<Aging Brain Research, connectedTo, Neurodegenerative Disease Research>
+<Brain_Computer Interface, connectedTo, Artificial Neural Networks Modeling>
+<Cognitive Neuroscience, connectedTo, Genetic Basis of Brain Disorders>
+<Deep Brain Stimulation, connectedTo, Cognitive Neuroscience>
+<Electrophysiology, connectedTo, Artificial Neural Networks Modeling>
+<Electrophysiology, connectedTo, Brain_Computer Interface>
+<Electrophysiology, connectedTo, Memory Formation Research>
+<Electrophysiology, connectedTo, Spike Train Analysis>
+<Genetic Basis of Brain Disorders, connectedTo, Artificial Neural Networks Modeling>
+<Memory Formation Research, connectedTo, Spike Train Analysis>
+<Memory Formation Research, connectedTo, Stem Cell Research>
+<Molecular Neuroscience, connectedTo, Artificial Neural Networks Modeling>
+<Molecular Neuroscience, connectedTo, Electrophysiology>
+<Molecular Neuroscience, connectedTo, Spike Train Analysis>
+<Molecular Neuroscience, translates, Memory Formation Research>
+<Motor Control Research, connectedTo, Neurotransmitter Research>
+<Neurodegenerative Disease Research, connectedTo, Memory Formation Research>
+<Neurodegenerative Disease Research, connectedTo, Molecular Neuroscience>
+<Neurodegenerative Disease Research, connectedTo, Pain Perception Research>
+<Neurotransmitter Research, connectedTo, Systems Neuroscience>
+<Pain Perception Research, connectedTo, Deep Brain Stimulation>
+<Spike Train Analysis, connectedTo, Artificial Neural Networks Modeling>
+<Spike Train Analysis, connectedTo, Brain_Computer Interface>
+<Stem Cell Research, connectedTo, Motor Control Research>
+<Systems Neuroscience, connectedTo, Electrophysiology>
diff --git a/test/diagrams/graph_hard/diagrams_35.dot b/test/diagrams/graph_hard/diagrams_35.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a28f44e7a6b5e397fb51024def11551ccb7d76c1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_35.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=LR
+	N0 [label="Currency Exchange" color="#FFE470" fillcolor="#FFFAE0" shape=inputoutput style=filled]
+	N1 [label="Souvenir Shopping" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+	N2 [label="Tour Guide Assignment" color="#03A9F4" fillcolor="#B3E5FC" shape=rectangle style=filled]
+	N3 [label="Travel Insurance" color="#03A9F4" fillcolor="#B3E5FC" shape=preparation style=filled]
+	N4 [label="Feedback Collection" color="#03A9F4" fillcolor="#B3E5FC" shape=preparation style=filled]
+	N5 [label="Emergency Assistance" color="#FFE470" fillcolor="#FFFAE0" shape=multipledocuments style=filled]
+	N6 [label="Booking Modification" color="#FFE470" fillcolor="#FFFAE0" shape=vnode_shape style=filled]
+	N7 [label="Loyalty Program Enrollment" color="#FFE470" fillcolor="#FFFAE0" shape=preparation style=filled]
+	N8 [label="Itinerary Planning" color="#FFE470" fillcolor="#FFFAE0" shape=preparation style=filled]
+	N9 [label="Lost and Found Service" color="#A188DB" fillcolor="#DED7F0" shape=action style=filled]
+	N10 [label="Rental Car Pickup" color="#FFE470" fillcolor="#FFFAE0" shape=document style=filled]
+	S2 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFE470" fillcolor="#FFFAE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Local Transport {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Local Transport"
+		nest0_0 [label="Travel Advisory Updates" color="#03A9F4" fillcolor="#B3E5FC" shape=preparation style=filled]
+		nest0_1 [label="Historical Site Exploration" color="#03A9F4" fillcolor="#B3E5FC" shape=vnode_shape style=filled]
+		nest0_2 [label="Event Reservation" color="#A188DB" fillcolor="#DED7F0" shape=rectangle style=filled]
+	}
+	subgraph cluster_Language Translation Service {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Language Translation Service"
+		nest1_0 [label="Tourist Information Desk" color="#FFE470" fillcolor="#FFFAE0" shape=diamond style=filled]
+		nest1_1 [label="Spa Appointment" color="#03A9F4" fillcolor="#B3E5FC" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed label="secures" dir=forward]
+	N4 -> N5 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#03A9F4" penwidth=1.5 style=solid label="entertains" dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest0_0 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N5 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	N7 -> M0 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N9 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	M1 -> N5 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_35.txt b/test/diagrams/graph_hard/diagrams_35.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a377f9c7c26dcf0df62bf6f02b276de26e14e050
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_35.txt
@@ -0,0 +1,27 @@
+<Booking Modification, connectedTo, Lost and Found Service>
+<Booking Modification, connectedTo, Loyalty Program Enrollment>
+<Currency Exchange, connectedTo, Emergency Assistance>
+<Currency Exchange, connectedTo, Souvenir Shopping>
+<Emergency Assistance, connectedTo, Booking Modification>
+<Event Reservation, connectedTo, Loyalty Program Enrollment>
+<Feedback Collection, connectedTo, Emergency Assistance>
+<Historical Site Exploration, connectedTo, Event Reservation>
+<Itinerary Planning, connectedTo, Lost and Found Service>
+<Itinerary Planning, connectedTo, Travel Advisory Updates>
+<Lost and Found Service, connectedTo, Rental Car Pickup>
+<Lost and Found Service, connectedTo, Tourist Information Desk>
+<Loyalty Program Enrollment, connectedTo, Itinerary Planning>
+<Loyalty Program Enrollment, connectedTo, Lost and Found Service>
+<Souvenir Shopping, connectedTo, Emergency Assistance>
+<Souvenir Shopping, connectedTo, Lost and Found Service>
+<Souvenir Shopping, connectedTo, Tour Guide Assignment>
+<Spa Appointment, connectedTo, Emergency Assistance>
+<Tour Guide Assignment, connectedTo, Emergency Assistance>
+<Tour Guide Assignment, connectedTo, Travel Insurance>
+<Tourist Information Desk, connectedTo, Spa Appointment>
+<Travel Advisory Updates, entertains, Historical Site Exploration>
+<Travel Insurance, connectedTo, Booking Modification>
+<Travel Insurance, connectedTo, Itinerary Planning>
+<Travel Insurance, connectedTo, Lost and Found Service>
+<Travel Insurance, connectedTo, Loyalty Program Enrollment>
+<Travel Insurance, secures, Feedback Collection>
diff --git a/test/diagrams/graph_hard/diagrams_350.dot b/test/diagrams/graph_hard/diagrams_350.dot
new file mode 100644
index 0000000000000000000000000000000000000000..54ce17e1601aebf3ffed78f0274c83110211583a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_350.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=LR
+	N0 [label="Stem Cell Research" color="#EAEFA5" fillcolor="#FDFCEB" shape=action style=filled]
+	N1 [label="Gene Therapy for Neurological Disorders" color="#F06292" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N2 [label="Memory Formation Research" color="#607D8B" fillcolor="#CFD8DC" shape=preparation style=filled]
+	N3 [label="Transcranial Magnetic Stimulation" color="#F06292" fillcolor="#FCE4EC" shape=action style=filled]
+	N4 [label="Brain_Computer Interface" color="#607D8B" fillcolor="#CFD8DC" shape=inputoutput style=filled]
+	N5 [label="Neurotransmitter Research" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N6 [label="Pain Perception Research" color="#607D8B" fillcolor="#CFD8DC" shape=preparation style=filled]
+	N7 [label="Connectomics" color="#EAEFA5" fillcolor="#FDFCEB" shape=document style=filled]
+	N8 [label="Addiction Neuroscience" color="#607D8B" fillcolor="#CFD8DC" shape=rectangle style=filled]
+	N9 [label="Computational Neuroscience" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N10 [label="Aging Brain Research" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N11 [label="Neural Data Analysis" color="#607D8B" fillcolor="#CFD8DC" shape=predefinedprocess style=filled]
+	N12 [label="Brain Imaging" color="#EAEFA5" fillcolor="#FDFCEB" shape=preparation style=filled]
+	N13 [label="Brain Mapping" color="#F06292" fillcolor="#FCE4EC" shape=rectangle style=filled]
+	N14 [label="Genetic Basis of Brain Disorders" color="#F06292" fillcolor="#FCE4EC" shape=action style=filled]
+	S0 [label="" color="#607D8B" fillcolor="#CFD8DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#607D8B" fillcolor="#CFD8DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#607D8B" fillcolor="#CFD8DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Sensory Perception Research {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Sensory Perception Research"
+		nest0_0 [label="Motor Control Research" color="#F06292" fillcolor="#FCE4EC" shape=diamond style=filled]
+		nest0_1 [label="Developmental Neuroscience" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+		nest0_2 [label="Consciousness Studies" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+		nest0_3 [label="Molecular Neuroscience" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	}
+	subgraph cluster_Neuroethics {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Neuroethics"
+		nest1_0 [label="Deep Brain Stimulation" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+		nest1_1 [label="Neurological Disorder Diagnosis" color="#607D8B" fillcolor="#CFD8DC" shape=action style=filled]
+	}
+	N0 -> N1 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#EAEFA5" penwidth=1.5 style=solid label="brains_explores" dir=forward]
+	N7 -> N8 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest0_0 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N4 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+	N7 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#EAEFA5" penwidth=1.5 style=dashed label="presents" dir=forward]
+	S0 -> N9 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#607D8B" penwidth=1.5 style=dashed label="regulates" dir=forward]
+	S1 -> N11 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#607D8B" penwidth=1.5 style=solid label="funds_raises" dir=forward]
+	N0 -> M0 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#EAEFA5" penwidth=1.5 style=solid label="treats_disorders" dir=forward]
+	M0 -> N5 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N3 [color="#607D8B" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#EAEFA5" penwidth=1.5 style=dashed label="innovates" dir=forward]
+	N0 -> M2 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	M2 -> N8 [color="#607D8B" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_350.txt b/test/diagrams/graph_hard/diagrams_350.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a2bb405de800499fd03514d97d68eeb430f6d1c0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_350.txt
@@ -0,0 +1,40 @@
+<Addiction Neuroscience, connectedTo, Computational Neuroscience>
+<Aging Brain Research, connectedTo, Neural Data Analysis>
+<Brain Imaging, connectedTo, Brain Mapping>
+<Brain Mapping, connectedTo, Genetic Basis of Brain Disorders>
+<Brain_Computer Interface, connectedTo, Neurotransmitter Research>
+<Computational Neuroscience, connectedTo, Aging Brain Research>
+<Connectomics, connectedTo, Addiction Neuroscience>
+<Connectomics, connectedTo, Brain Imaging>
+<Connectomics, connectedTo, Computational Neuroscience>
+<Connectomics, presents, Aging Brain Research>
+<Consciousness Studies, connectedTo, Molecular Neuroscience>
+<Deep Brain Stimulation, connectedTo, Neurological Disorder Diagnosis>
+<Deep Brain Stimulation, partOf, Deep Brain Stimulation>
+<Developmental Neuroscience, connectedTo, Consciousness Studies>
+<Gene Therapy for Neurological Disorders, connectedTo, Computational Neuroscience>
+<Gene Therapy for Neurological Disorders, connectedTo, Connectomics>
+<Gene Therapy for Neurological Disorders, connectedTo, Memory Formation Research>
+<Gene Therapy for Neurological Disorders, connectedTo, Motor Control Research>
+<Gene Therapy for Neurological Disorders, connectedTo, Neural Data Analysis>
+<Gene Therapy for Neurological Disorders, connectedTo, Transcranial Magnetic Stimulation>
+<Gene Therapy for Neurological Disorders, innovates, Addiction Neuroscience>
+<Gene Therapy for Neurological Disorders, regulates, Pain Perception Research>
+<Gene Therapy for Neurological Disorders, treats_disorders, Neurotransmitter Research>
+<Memory Formation Research, connectedTo, Transcranial Magnetic Stimulation>
+<Memory Formation Research, funds_raises, Neurotransmitter Research>
+<Molecular Neuroscience, connectedTo, Connectomics>
+<Motor Control Research, connectedTo, Developmental Neuroscience>
+<Neural Data Analysis, connectedTo, Brain Imaging>
+<Neurological Disorder Diagnosis, connectedTo, Brain_Computer Interface>
+<Neurological Disorder Diagnosis, partOf, Neurological Disorder Diagnosis>
+<Neurotransmitter Research, connectedTo, Addiction Neuroscience>
+<Neurotransmitter Research, connectedTo, Pain Perception Research>
+<Pain Perception Research, brains_explores, Connectomics>
+<Pain Perception Research, connectedTo, Deep Brain Stimulation>
+<Stem Cell Research, connectedTo, Addiction Neuroscience>
+<Stem Cell Research, connectedTo, Gene Therapy for Neurological Disorders>
+<Stem Cell Research, connectedTo, Neurotransmitter Research>
+<Stem Cell Research, connectedTo, Transcranial Magnetic Stimulation>
+<Transcranial Magnetic Stimulation, connectedTo, Brain_Computer Interface>
+<Transcranial Magnetic Stimulation, connectedTo, Neurotransmitter Research>
diff --git a/test/diagrams/graph_hard/diagrams_351.dot b/test/diagrams/graph_hard/diagrams_351.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3156127a1a3b5c1d982596c970d2b8c89e0382ce
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_351.dot
@@ -0,0 +1,95 @@
+digraph {
+	rankdir=RL
+	N0 [label="Cognitive Neuroscience" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N1 [label="Neurofeedback Therapy" color="#5C6BC0" fillcolor="#E8EAF6" shape=predefinedprocess style=filled]
+	N2 [label="Aging Brain Research" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+	N3 [label="Neurodegenerative Disease Research" color="#FFCC7A" fillcolor="#FFF6D9" shape=rect style=filled]
+	N4 [label="Neurological Disorder Diagnosis" color="#FFCC7A" fillcolor="#FFF6D9" shape=vnode_shape style=filled]
+	N5 [label="Brain Mapping" color="#FFCC7A" fillcolor="#FFF6D9" shape=preparation style=filled]
+	N6 [label="Cellular Neuroscience" color="#9FA9E1" fillcolor="#D6D9F0" shape=database style=filled]
+	N7 [label="Learning Mechanisms Study" color="#5C6BC0" fillcolor="#E8EAF6" shape=inputoutput style=filled]
+	N8 [label="Brain Imaging" color="#FFCC7A" fillcolor="#FFF6D9" shape=preparation style=filled]
+	N9 [label="Consciousness Studies" color="#FFCC7A" fillcolor="#FFF6D9" shape=rect style=filled]
+	N10 [label="Systems Neuroscience" color="#5C6BC0" fillcolor="#E8EAF6" shape=predefinedprocess style=filled]
+	N11 [label="Drug Development for Brain Disorders" color="#5C6BC0" fillcolor="#E8EAF6" shape=action style=filled]
+	N12 [label="Molecular Neuroscience" color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+	N13 [label="Artificial Neural Networks Modeling" color="#5C6BC0" fillcolor="#E8EAF6" shape=multipledocuments style=filled]
+	N14 [label="Behavioral Neuroscience" color="#9FA9E1" fillcolor="#D6D9F0" shape=preparation style=filled]
+	N15 [label="Neurotransmitter Research" color="#FFCC7A" fillcolor="#FFF6D9" shape=database style=filled]
+	N16 [label="Pain Perception Research" color="#9FA9E1" fillcolor="#D6D9F0" shape=inputoutput style=filled]
+	N17 [label="Neuroethics" color="#9FA9E1" fillcolor="#D6D9F0" shape=multipledocuments style=filled]
+	N18 [label="Synaptic Plasticity Study" color="#9FA9E1" fillcolor="#D6D9F0" shape=action style=filled]
+	N19 [label="Neural Network Analysis" color="#5C6BC0" fillcolor="#E8EAF6" shape=inputoutput style=filled]
+	S0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFCC7A" fillcolor="#FFF6D9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFCC7A" fillcolor="#FFF6D9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Developmental Neuroscience {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Developmental Neuroscience"
+		nest0_0 [label="Transcranial Magnetic Stimulation" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+		nest0_1 [label="Addiction Neuroscience" color="#FFCC7A" fillcolor="#FFF6D9" shape=diamond style=filled]
+	}
+	subgraph cluster_Neural Data Analysis {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Neural Data Analysis"
+		nest1_0 [label="Computational Neuroscience" color="#FFCC7A" fillcolor="#FFF6D9" shape=multipledocuments style=filled]
+		nest1_1 [label="Stem Cell Research" color="#9FA9E1" fillcolor="#D6D9F0" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed label="simulates" dir=forward]
+	N6 -> N7 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N17 -> N18 [color="#5C6BC0" penwidth=1.5 style=dashed label="therapies_develops" dir=forward]
+	N18 -> N19 [color="#000000" penwidth=1.5 style=dashed label="neurons_investigates" dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#000000" penwidth=1.5 style=solid label="analyzes" dir=forward]
+	nest0_1 -> N18 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest1_0 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N17 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N13 -> S0 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	S0 -> N18 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N17 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N17 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N15 [color="#9FA9E1" penwidth=1.5 style=solid label="presents" dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=solid label="innovates" dir=forward]
+	N1 -> S2 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N17 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N14 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N13 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N10 -> M0 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	M0 -> N17 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#9FA9E1" penwidth=1.5 style=dashed label="observes" dir=forward]
+	N0 -> M1 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#5C6BC0" penwidth=1.5 style=solid label="translates" dir=forward]
+	N6 -> M2 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	M2 -> N8 [color="#5C6BC0" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_351.txt b/test/diagrams/graph_hard/diagrams_351.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7431bd709f3cc7bde3c23f93f09339e53331d895
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_351.txt
@@ -0,0 +1,46 @@
+<Addiction Neuroscience, connectedTo, Synaptic Plasticity Study>
+<Aging Brain Research, connectedTo, Neurodegenerative Disease Research>
+<Aging Brain Research, connectedTo, Neuroethics>
+<Artificial Neural Networks Modeling, connectedTo, Behavioral Neuroscience>
+<Artificial Neural Networks Modeling, connectedTo, Neuroethics>
+<Artificial Neural Networks Modeling, connectedTo, Synaptic Plasticity Study>
+<Behavioral Neuroscience, connectedTo, Neurotransmitter Research>
+<Brain Imaging, connectedTo, Consciousness Studies>
+<Brain Imaging, connectedTo, Drug Development for Brain Disorders>
+<Brain Imaging, connectedTo, Neuroethics>
+<Brain Imaging, innovates, Artificial Neural Networks Modeling>
+<Brain Imaging, presents, Neurotransmitter Research>
+<Brain Mapping, connectedTo, Brain Imaging>
+<Brain Mapping, connectedTo, Neuroethics>
+<Brain Mapping, simulates, Cellular Neuroscience>
+<Cellular Neuroscience, connectedTo, Brain Imaging>
+<Cellular Neuroscience, connectedTo, Learning Mechanisms Study>
+<Cellular Neuroscience, connectedTo, Neuroethics>
+<Cognitive Neuroscience, connectedTo, Learning Mechanisms Study>
+<Cognitive Neuroscience, connectedTo, Neurofeedback Therapy>
+<Computational Neuroscience, connectedTo, Stem Cell Research>
+<Consciousness Studies, connectedTo, Computational Neuroscience>
+<Consciousness Studies, connectedTo, Systems Neuroscience>
+<Drug Development for Brain Disorders, connectedTo, Molecular Neuroscience>
+<Learning Mechanisms Study, connectedTo, Brain Imaging>
+<Molecular Neuroscience, connectedTo, Artificial Neural Networks Modeling>
+<Neurodegenerative Disease Research, analyzes, Transcranial Magnetic Stimulation>
+<Neurodegenerative Disease Research, connectedTo, Neurological Disorder Diagnosis>
+<Neuroethics, therapies_develops, Synaptic Plasticity Study>
+<Neurofeedback Therapy, connectedTo, Aging Brain Research>
+<Neurofeedback Therapy, connectedTo, Artificial Neural Networks Modeling>
+<Neurofeedback Therapy, connectedTo, Behavioral Neuroscience>
+<Neurofeedback Therapy, connectedTo, Brain Imaging>
+<Neurofeedback Therapy, connectedTo, Neuroethics>
+<Neurofeedback Therapy, connectedTo, Systems Neuroscience>
+<Neurofeedback Therapy, observes, Learning Mechanisms Study>
+<Neurological Disorder Diagnosis, connectedTo, Brain Mapping>
+<Neurological Disorder Diagnosis, connectedTo, Learning Mechanisms Study>
+<Neurological Disorder Diagnosis, translates, Brain Imaging>
+<Neurotransmitter Research, connectedTo, Pain Perception Research>
+<Pain Perception Research, connectedTo, Neuroethics>
+<Stem Cell Research, connectedTo, Neuroethics>
+<Synaptic Plasticity Study, neurons_investigates, Neural Network Analysis>
+<Systems Neuroscience, connectedTo, Drug Development for Brain Disorders>
+<Systems Neuroscience, connectedTo, Neuroethics>
+<Transcranial Magnetic Stimulation, connectedTo, Addiction Neuroscience>
diff --git a/test/diagrams/graph_hard/diagrams_352.dot b/test/diagrams/graph_hard/diagrams_352.dot
new file mode 100644
index 0000000000000000000000000000000000000000..27243ccb4f578c2db4a24fadedd9c9ac1b5a8fdc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_352.dot
@@ -0,0 +1,83 @@
+digraph {
+	rankdir=BT
+	N0 [label="Conservation Science" color="#6FE1D5" fillcolor="#C9EFEC" shape=rect style=filled]
+	N1 [label="Looting Prevention" color="#6FE1D5" fillcolor="#C9EFEC" shape=diamond style=filled]
+	N2 [label="Augmented Reality Tours" color="#6FE1D5" fillcolor="#C9EFEC" shape=vnode_shape style=filled]
+	N3 [label="Disaster Preparedness for Heritage" color="#BA68C8" fillcolor="#F3E5F5" shape=predefinedprocess style=filled]
+	N4 [label="World Heritage Site Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=vnode_shape style=filled]
+	N5 [label="Indigenous Cultural Heritage Rights" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N6 [label="Photogrammetry for Documentation" color="#6FE1D5" fillcolor="#C9EFEC" shape=predefinedprocess style=filled]
+	N7 [label="Heritage Impact Assessment" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N8 [label="Crowdsourcing for Heritage Data" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N9 [label="Digital Documentation" color="#64B5F6" fillcolor="#E3F2FD" shape=inputoutput style=filled]
+	N10 [label="Heritage Site Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N11 [label="Artifact Conservation" color="#BA68C8" fillcolor="#F3E5F5" shape=action style=filled]
+	N12 [label="Digital Storytelling" color="#64B5F6" fillcolor="#E3F2FD" shape=multipledocuments style=filled]
+	N13 [label="Virtual Reality Recreations" color="#6FE1D5" fillcolor="#C9EFEC" shape=multipledocuments style=filled]
+	N14 [label="Site Preservation" color="#64B5F6" fillcolor="#E3F2FD" shape=document style=filled]
+	S0 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Archaeological Excavation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Archaeological Excavation"
+		nest0_0 [label="Archival Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=rectangle style=filled]
+		nest0_1 [label="Traditional Knowledge Documentation" color="#6FE1D5" fillcolor="#C9EFEC" shape=rect style=filled]
+		nest0_2 [label="Community Engagement" color="#6FE1D5" fillcolor="#C9EFEC" shape=rect style=filled]
+		nest0_3 [label="Sustainable Heritage Management" color="#64B5F6" fillcolor="#E3F2FD" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Climate Change Impact on Heritage {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Climate Change Impact on Heritage"
+		nest1_0 [label="Illicit Trafficking Control" color="#64B5F6" fillcolor="#E3F2FD" shape=inputoutput style=filled]
+		nest1_1 [label="Underwater Cultural Heritage" color="#6FE1D5" fillcolor="#C9EFEC" shape=database style=filled]
+		nest1_2 [label="Material Analysis" color="#BA68C8" fillcolor="#F3E5F5" shape=diamond style=filled]
+		nest1_3 [label="3D Scanning of Artifacts" color="#BA68C8" fillcolor="#F3E5F5" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest0_0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N11 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> S0 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N0 -> S1 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N7 -> S2 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N14 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N13 [color="#000000" penwidth=1.5 style=solid label="intangible_heritage_safeguards" dir=forward]
+	S2 -> N11 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N12 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N5 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_353.dot b/test/diagrams/graph_hard/diagrams_353.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dee20271f56293a57dccda373cdf304df089cbd2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_353.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=BT
+	N0 [label="Dating Techniques" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N1 [label="Historical Research" color="#AF56A6" fillcolor="#DDCEDD" shape=parallelogram style=filled]
+	N2 [label="Traditional Knowledge Documentation" color="#64B5F6" fillcolor="#E3F2FD" shape=rect style=filled]
+	N3 [label="Repatriation of Artifacts" color="#AF56A6" fillcolor="#DDCEDD" shape=predefinedprocess style=filled]
+	N4 [label="Archaeological Excavation" color="#B8C0F5" fillcolor="#ECF0FD" shape=predefinedprocess style=filled]
+	N5 [label="Looting Prevention" color="#AF56A6" fillcolor="#DDCEDD" shape=parallelogram style=filled]
+	N6 [label="Community Engagement" color="#64B5F6" fillcolor="#E3F2FD" shape=multipledocuments style=filled]
+	N7 [label="Heritage Site Management" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N8 [label="Augmented Reality Tours" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N9 [label="3D Scanning of Artifacts" color="#64B5F6" fillcolor="#E3F2FD" shape=preparation style=filled]
+	N10 [label="Adaptive Reuse of Heritage Buildings" color="#B8C0F5" fillcolor="#ECF0FD" shape=action style=filled]
+	N11 [label="Oral History Collection" color="#AF56A6" fillcolor="#DDCEDD" shape=database style=filled]
+	N12 [label="Indigenous Cultural Heritage Rights" color="#AF56A6" fillcolor="#DDCEDD" shape=rectangle style=filled]
+	S0 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Illicit Trafficking Control {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Illicit Trafficking Control"
+		nest0_0 [label="Legal Protection for Heritage" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+		nest0_1 [label="World Heritage Site Management" color="#B8C0F5" fillcolor="#ECF0FD" shape=database style=filled]
+	}
+	subgraph cluster_Photogrammetry for Documentation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Photogrammetry for Documentation"
+		nest1_0 [label="Material Analysis" color="#AF56A6" fillcolor="#DDCEDD" shape=action style=filled]
+		nest1_1 [label="Museum Collection Management" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#64B5F6" penwidth=1.5 style=solid label="technologies_applies" dir=forward]
+	N9 -> N10 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest0_0 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N6 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N2 -> S0 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N4 [color="#AF56A6" penwidth=1.5 style=solid label="community_participates" dir=forward]
+	S0 -> N9 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N8 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	M1 -> N4 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_353.txt b/test/diagrams/graph_hard/diagrams_353.txt
new file mode 100644
index 0000000000000000000000000000000000000000..941da97f5a65f76e18dc2bd207ef66e9a803174d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_353.txt
@@ -0,0 +1,31 @@
+<3D Scanning of Artifacts, connectedTo, Adaptive Reuse of Heritage Buildings>
+<3D Scanning of Artifacts, connectedTo, Legal Protection for Heritage>
+<Adaptive Reuse of Heritage Buildings, connectedTo, Oral History Collection>
+<Archaeological Excavation, connectedTo, Community Engagement>
+<Archaeological Excavation, connectedTo, Looting Prevention>
+<Augmented Reality Tours, technologies_applies, 3D Scanning of Artifacts>
+<Community Engagement, connectedTo, Augmented Reality Tours>
+<Community Engagement, connectedTo, Heritage Site Management>
+<Dating Techniques, connectedTo, Archaeological Excavation>
+<Dating Techniques, connectedTo, Augmented Reality Tours>
+<Dating Techniques, connectedTo, Community Engagement>
+<Dating Techniques, connectedTo, Historical Research>
+<Heritage Site Management, connectedTo, Augmented Reality Tours>
+<Historical Research, connectedTo, 3D Scanning of Artifacts>
+<Historical Research, connectedTo, Archaeological Excavation>
+<Historical Research, connectedTo, Community Engagement>
+<Historical Research, connectedTo, Material Analysis>
+<Historical Research, connectedTo, Oral History Collection>
+<Historical Research, connectedTo, Traditional Knowledge Documentation>
+<Legal Protection for Heritage, connectedTo, World Heritage Site Management>
+<Looting Prevention, connectedTo, Community Engagement>
+<Material Analysis, connectedTo, Museum Collection Management>
+<Museum Collection Management, connectedTo, Community Engagement>
+<Oral History Collection, connectedTo, Indigenous Cultural Heritage Rights>
+<Repatriation of Artifacts, connectedTo, Archaeological Excavation>
+<Repatriation of Artifacts, connectedTo, Community Engagement>
+<Traditional Knowledge Documentation, community_participates, Archaeological Excavation>
+<Traditional Knowledge Documentation, connectedTo, 3D Scanning of Artifacts>
+<Traditional Knowledge Documentation, connectedTo, Archaeological Excavation>
+<Traditional Knowledge Documentation, connectedTo, Repatriation of Artifacts>
+<World Heritage Site Management, connectedTo, Looting Prevention>
diff --git a/test/diagrams/graph_hard/diagrams_354.dot b/test/diagrams/graph_hard/diagrams_354.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d517e09e18991d0672d35c01fb0061b55b8af2f4
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_354.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=TB
+	N0 [label="Legal Protection for Heritage" color="#AED581" fillcolor="#F0F4C3" shape=action style=filled]
+	N1 [label="Museum Collection Management" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N2 [label="Looting Prevention" color="#81C784" fillcolor="#F1F8E9" shape=action style=filled]
+	N3 [label="Traditional Knowledge Documentation" color="#AED581" fillcolor="#F0F4C3" shape=inputoutput style=filled]
+	N4 [label="Climate Change Impact on Heritage" color="#AED581" fillcolor="#F0F4C3" shape=multipledocuments style=filled]
+	N5 [label="Disaster Preparedness for Heritage" color="#81C784" fillcolor="#F1F8E9" shape=database style=filled]
+	N6 [label="Digital Storytelling" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N7 [label="Digital Documentation" color="#795548" fillcolor="#D7CCC8" shape=action style=filled]
+	N8 [label="Remote Sensing for Heritage" color="#81C784" fillcolor="#F1F8E9" shape=database style=filled]
+	N9 [label="Augmented Reality Tours" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N10 [label="Cultural Tourism Development" color="#AED581" fillcolor="#F0F4C3" shape=action style=filled]
+	N11 [label="Repatriation of Artifacts" color="#AED581" fillcolor="#F0F4C3" shape=multipledocuments style=filled]
+	N12 [label="Restoration Techniques" color="#795548" fillcolor="#D7CCC8" shape=rectangle style=filled]
+	N13 [label="Historical Research" color="#AED581" fillcolor="#F0F4C3" shape=multipledocuments style=filled]
+	N14 [label="Archival Management" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	S0 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#81C784" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Oral History Collection {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Oral History Collection"
+		nest0_0 [label="Risk Assessment for Heritage" color="#AED581" fillcolor="#F0F4C3" shape=preparation style=filled]
+		nest0_1 [label="Photogrammetry for Documentation" color="#795548" fillcolor="#D7CCC8" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Conservation Science {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Conservation Science"
+		nest1_0 [label="Illicit Trafficking Control" color="#81C784" fillcolor="#F1F8E9" shape=diamond style=filled]
+		nest1_1 [label="Artifact Conservation" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+		nest1_2 [label="Material Analysis" color="#795548" fillcolor="#D7CCC8" shape=predefinedprocess style=filled]
+		nest1_3 [label="Exhibition Curation" color="#795548" fillcolor="#D7CCC8" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid label="buildings_maintains" dir=forward]
+	nest1_1 -> nest1_2 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N2 [color="#000000" penwidth=1.5 style=solid label="narrates" dir=forward]
+	N8 -> S0 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#81C784" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S1 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#81C784" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N5 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N4 [color="#795548" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_354.txt b/test/diagrams/graph_hard/diagrams_354.txt
new file mode 100644
index 0000000000000000000000000000000000000000..194f3d7928630b5bbc0ad1f1616e6a7c00c011be
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_354.txt
@@ -0,0 +1,32 @@
+<Artifact Conservation, connectedTo, Material Analysis>
+<Augmented Reality Tours, connectedTo, Cultural Tourism Development>
+<Climate Change Impact on Heritage, connectedTo, Disaster Preparedness for Heritage>
+<Cultural Tourism Development, connectedTo, Repatriation of Artifacts>
+<Digital Documentation, connectedTo, Remote Sensing for Heritage>
+<Digital Storytelling, connectedTo, Augmented Reality Tours>
+<Digital Storytelling, connectedTo, Digital Documentation>
+<Digital Storytelling, connectedTo, Remote Sensing for Heritage>
+<Digital Storytelling, connectedTo, Restoration Techniques>
+<Disaster Preparedness for Heritage, connectedTo, Digital Storytelling>
+<Disaster Preparedness for Heritage, connectedTo, Risk Assessment for Heritage>
+<Exhibition Curation, narrates, Looting Prevention>
+<Historical Research, connectedTo, Archival Management>
+<Illicit Trafficking Control, buildings_maintains, Artifact Conservation>
+<Legal Protection for Heritage, connectedTo, Disaster Preparedness for Heritage>
+<Legal Protection for Heritage, connectedTo, Museum Collection Management>
+<Looting Prevention, connectedTo, Climate Change Impact on Heritage>
+<Looting Prevention, connectedTo, Illicit Trafficking Control>
+<Looting Prevention, connectedTo, Traditional Knowledge Documentation>
+<Material Analysis, connectedTo, Exhibition Curation>
+<Museum Collection Management, connectedTo, Climate Change Impact on Heritage>
+<Museum Collection Management, connectedTo, Disaster Preparedness for Heritage>
+<Museum Collection Management, connectedTo, Looting Prevention>
+<Photogrammetry for Documentation, connectedTo, Archival Management>
+<Remote Sensing for Heritage, connectedTo, Archival Management>
+<Remote Sensing for Heritage, connectedTo, Augmented Reality Tours>
+<Remote Sensing for Heritage, connectedTo, Historical Research>
+<Remote Sensing for Heritage, connectedTo, Restoration Techniques>
+<Repatriation of Artifacts, connectedTo, Restoration Techniques>
+<Restoration Techniques, connectedTo, Historical Research>
+<Risk Assessment for Heritage, connectedTo, Photogrammetry for Documentation>
+<Traditional Knowledge Documentation, connectedTo, Climate Change Impact on Heritage>
diff --git a/test/diagrams/graph_hard/diagrams_355.dot b/test/diagrams/graph_hard/diagrams_355.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9afd5d4d72c828f882a7c7f87043f418af7072cf
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_355.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=BT
+	N0 [label="Synthetic Organism Design" color="#DCE775" fillcolor="#F9FBE7" shape=diamond style=filled]
+	N1 [label="Vaccine Synthesis" color="#FFD54F" fillcolor="#FFF8E1" shape=rect style=filled]
+	N2 [label="Bioremediation Applications" color="#DCE775" fillcolor="#F9FBE7" shape=preparation style=filled]
+	N3 [label="Biosecurity Protocols" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N4 [label="Bio_manufacturing" color="#FF8A65" fillcolor="#FBE9E7" shape=preparation style=filled]
+	N5 [label="Biocontainment Strategies" color="#DCE775" fillcolor="#F9FBE7" shape=preparation style=filled]
+	N6 [label="Gene Therapy Delivery Systems" color="#FFD54F" fillcolor="#FFF8E1" shape=rectangle style=filled]
+	N7 [label="Biofuel Production" color="#DCE775" fillcolor="#F9FBE7" shape=database style=filled]
+	N8 [label="Risk Assessment" color="#FF8A65" fillcolor="#FBE9E7" shape=diamond style=filled]
+	N9 [label="Synthetic Gene Networks" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+	N10 [label="Automated Biology Workflows" color="#FF8A65" fillcolor="#FBE9E7" shape=database style=filled]
+	N11 [label="Novel Enzyme Creation" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+	N12 [label="Sustainable Chemical Production" color="#FF8A65" fillcolor="#FBE9E7" shape=multipledocuments style=filled]
+	N13 [label="DNA Synthesis" color="#DCE775" fillcolor="#F9FBE7" shape=vnode_shape style=filled]
+	N14 [label="Regulatory Frameworks" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+	N15 [label="Ethical Implications" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N16 [label="High_Throughput Screening" color="#DCE775" fillcolor="#F9FBE7" shape=vnode_shape style=filled]
+	N17 [label="Biosafety Level Management" color="#FF8A65" fillcolor="#FBE9E7" shape=inputoutput style=filled]
+	S0 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Drug Delivery Systems {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Drug Delivery Systems"
+		nest0_0 [label="Biofoundry Operations" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+		nest0_1 [label="Directed Evolution" color="#FFD54F" fillcolor="#FFF8E1" shape=predefinedprocess style=filled]
+		nest0_2 [label="Bio_logic Gates" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	}
+	subgraph cluster_DNA Storage Technologies {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="DNA Storage Technologies"
+		nest1_0 [label="Directed Evolution Automation" color="#DCE775" fillcolor="#F9FBE7" shape=preparation style=filled]
+		nest1_1 [label="Artificial Cells" color="#DCE775" fillcolor="#F9FBE7" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest0_0 [color="#DCE775" penwidth=1.5 style=solid label="functions_implements" dir=forward]
+	nest0_2 -> N9 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest1_0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#FF8A65" penwidth=1.5 style=solid label="security_manages" dir=forward]
+	S0 -> N13 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> S1 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	S1 -> N16 [color="#000000" penwidth=1.5 style=solid label="fuels_generates" dir=forward]
+	S1 -> N13 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S2 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S2 -> N11 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N3 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_355.txt b/test/diagrams/graph_hard/diagrams_355.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bc2fd11762ca2d57082d472625d0b82ccb8a7b0a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_355.txt
@@ -0,0 +1,35 @@
+<Artificial Cells, connectedTo, Novel Enzyme Creation>
+<Automated Biology Workflows, connectedTo, Novel Enzyme Creation>
+<Bio_logic Gates, connectedTo, Synthetic Gene Networks>
+<Bio_manufacturing, connectedTo, Biocontainment Strategies>
+<Biocontainment Strategies, connectedTo, DNA Synthesis>
+<Biocontainment Strategies, connectedTo, Gene Therapy Delivery Systems>
+<Biocontainment Strategies, connectedTo, Regulatory Frameworks>
+<Biocontainment Strategies, connectedTo, Synthetic Gene Networks>
+<Biocontainment Strategies, security_manages, Novel Enzyme Creation>
+<Biofoundry Operations, connectedTo, Directed Evolution>
+<Biofuel Production, connectedTo, Directed Evolution Automation>
+<Biofuel Production, connectedTo, Risk Assessment>
+<Bioremediation Applications, connectedTo, Biosecurity Protocols>
+<Biosecurity Protocols, connectedTo, Bio_manufacturing>
+<DNA Synthesis, connectedTo, Regulatory Frameworks>
+<Directed Evolution, connectedTo, Bio_logic Gates>
+<Directed Evolution Automation, connectedTo, Artificial Cells>
+<Ethical Implications, connectedTo, High_Throughput Screening>
+<Gene Therapy Delivery Systems, connectedTo, Biofuel Production>
+<High_Throughput Screening, connectedTo, Biosafety Level Management>
+<Novel Enzyme Creation, connectedTo, Sustainable Chemical Production>
+<Regulatory Frameworks, connectedTo, Ethical Implications>
+<Risk Assessment, connectedTo, Automated Biology Workflows>
+<Risk Assessment, connectedTo, Novel Enzyme Creation>
+<Risk Assessment, connectedTo, Sustainable Chemical Production>
+<Risk Assessment, connectedTo, Synthetic Gene Networks>
+<Sustainable Chemical Production, connectedTo, DNA Synthesis>
+<Synthetic Gene Networks, connectedTo, Automated Biology Workflows>
+<Synthetic Gene Networks, connectedTo, DNA Synthesis>
+<Synthetic Gene Networks, fuels_generates, High_Throughput Screening>
+<Synthetic Organism Design, connectedTo, Biosecurity Protocols>
+<Synthetic Organism Design, connectedTo, Vaccine Synthesis>
+<Vaccine Synthesis, connectedTo, Bioremediation Applications>
+<Vaccine Synthesis, connectedTo, Biosecurity Protocols>
+<Vaccine Synthesis, functions_implements, Biofoundry Operations>
diff --git a/test/diagrams/graph_hard/diagrams_356.dot b/test/diagrams/graph_hard/diagrams_356.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a74f9d3584e463d5ca59f3cf911b4da43400adb6
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_356.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=TB
+	N0 [label="Biocontainment Strategies" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+	N1 [label="Synthetic Organism Design" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N2 [label="Bio_logic Gates" color="#CDDC39" fillcolor="#E6EE9C" shape=document style=filled]
+	N3 [label="Automated Biology Workflows" color="#CDDC39" fillcolor="#E6EE9C" shape=inputoutput style=filled]
+	N4 [label="Modular Biology Design" color="#A2D0FF" fillcolor="#E8F0FF" shape=vnode_shape style=filled]
+	N5 [label="DNA Synthesis" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+	N6 [label="Metabolic Pathway Engineering" color="#CDDC39" fillcolor="#E6EE9C" shape=predefinedprocess style=filled]
+	N7 [label="Vaccine Synthesis" color="#42A5F5" fillcolor="#F1F8FF" shape=document style=filled]
+	N8 [label="Bio_computation" color="#A2D0FF" fillcolor="#E8F0FF" shape=rect style=filled]
+	N9 [label="DNA Storage Technologies" color="#A2D0FF" fillcolor="#E8F0FF" shape=rect style=filled]
+	N10 [label="High_Throughput Screening" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+	N11 [label="Computational Design of Biological Systems" color="#CDDC39" fillcolor="#E6EE9C" shape=document style=filled]
+	N12 [label="Bioremediation Applications" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N13 [label="CRISPR_Cas System Optimization" color="#A2D0FF" fillcolor="#E8F0FF" shape=inputoutput style=filled]
+	N14 [label="Directed Evolution Automation" color="#42A5F5" fillcolor="#F1F8FF" shape=document style=filled]
+	N15 [label="Gene Synthesis Platforms" color="#42A5F5" fillcolor="#F1F8FF" shape=vnode_shape style=filled]
+	N16 [label="Protein Design" color="#CDDC39" fillcolor="#E6EE9C" shape=predefinedprocess style=filled]
+	N17 [label="Genetic Circuit Design" color="#42A5F5" fillcolor="#F1F8FF" shape=predefinedprocess style=filled]
+	S0 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#42A5F5" fillcolor="#F1F8FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Regulatory Frameworks {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Regulatory Frameworks"
+		nest0_0 [label="Artificial Cells" color="#CDDC39" fillcolor="#E6EE9C" shape=multipledocuments style=filled]
+		nest0_1 [label="Genome Engineering" color="#CDDC39" fillcolor="#E6EE9C" shape=multipledocuments style=filled]
+		nest0_2 [label="Directed Evolution" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+	}
+	subgraph cluster_Ethical Implications {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Ethical Implications"
+		nest1_0 [label="Biosensor Development" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+		nest1_1 [label="Diagnostic Tool Development" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+		nest1_2 [label="Synthetic Gene Networks" color="#42A5F5" fillcolor="#F1F8FF" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed label="rewrites" dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#42A5F5" penwidth=1.5 style=dashed label="pathways_constructs" dir=forward]
+	N8 -> N9 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#CDDC39" penwidth=1.5 style=solid label="manipulates" dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid label="materials_develops" dir=forward]
+	N15 -> N16 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N10 -> nest0_0 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N13 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N15 -> nest1_0 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N1 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S0 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N16 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=dashed label="collaborates" dir=forward]
+	N8 -> S1 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N17 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=dashed label="purifies" dir=forward]
+	N11 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> M0 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	M0 -> N13 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N7 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_356.txt b/test/diagrams/graph_hard/diagrams_356.txt
new file mode 100644
index 0000000000000000000000000000000000000000..72fa02a08a62ab49bace7d65bb7e88bbffe35f7f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_356.txt
@@ -0,0 +1,34 @@
+<Artificial Cells, connectedTo, Genome Engineering>
+<Automated Biology Workflows, rewrites, Modular Biology Design>
+<Bio_computation, connectedTo, Bioremediation Applications>
+<Bio_computation, connectedTo, DNA Storage Technologies>
+<Bio_computation, connectedTo, Genetic Circuit Design>
+<Bio_computation, purifies, High_Throughput Screening>
+<Bio_logic Gates, connectedTo, Automated Biology Workflows>
+<Bio_logic Gates, connectedTo, Vaccine Synthesis>
+<Biocontainment Strategies, collaborates, Computational Design of Biological Systems>
+<Biocontainment Strategies, connectedTo, Protein Design>
+<Biocontainment Strategies, connectedTo, Synthetic Organism Design>
+<Bioremediation Applications, connectedTo, CRISPR_Cas System Optimization>
+<Biosensor Development, connectedTo, Diagnostic Tool Development>
+<CRISPR_Cas System Optimization, manipulates, Directed Evolution Automation>
+<Computational Design of Biological Systems, connectedTo, Bioremediation Applications>
+<Computational Design of Biological Systems, connectedTo, CRISPR_Cas System Optimization>
+<DNA Storage Technologies, connectedTo, High_Throughput Screening>
+<DNA Synthesis, connectedTo, Metabolic Pathway Engineering>
+<DNA Synthesis, connectedTo, Vaccine Synthesis>
+<Diagnostic Tool Development, connectedTo, Synthetic Gene Networks>
+<Directed Evolution, connectedTo, CRISPR_Cas System Optimization>
+<Directed Evolution Automation, materials_develops, Gene Synthesis Platforms>
+<Gene Synthesis Platforms, connectedTo, Biosensor Development>
+<Gene Synthesis Platforms, connectedTo, Protein Design>
+<Genome Engineering, connectedTo, Directed Evolution>
+<High_Throughput Screening, connectedTo, Artificial Cells>
+<High_Throughput Screening, connectedTo, CRISPR_Cas System Optimization>
+<High_Throughput Screening, connectedTo, Computational Design of Biological Systems>
+<Metabolic Pathway Engineering, connectedTo, Vaccine Synthesis>
+<Modular Biology Design, connectedTo, DNA Synthesis>
+<Protein Design, connectedTo, Genetic Circuit Design>
+<Synthetic Gene Networks, connectedTo, Synthetic Organism Design>
+<Synthetic Organism Design, connectedTo, Bio_logic Gates>
+<Vaccine Synthesis, pathways_constructs, Bio_computation>
diff --git a/test/diagrams/graph_hard/diagrams_357.dot b/test/diagrams/graph_hard/diagrams_357.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c64135de954c23bc149545f8db52b532156a6c6f
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_357.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=TB
+	N0 [label="Risk Assessment" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+	N1 [label="Gene Therapy Delivery Systems" color="#A2D0FF" fillcolor="#E8F0FF" shape=rectangle style=filled]
+	N2 [label="Artificial Cells" color="#A2D0FF" fillcolor="#E8F0FF" shape=rect style=filled]
+	N3 [label="Synthetic Organism Design" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N4 [label="Public Engagement" color="#A2D0FF" fillcolor="#E8F0FF" shape=rect style=filled]
+	N5 [label="Bio_computation" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N6 [label="DNA Storage Technologies" color="#A1887F" fillcolor="#EFEBE9" shape=database style=filled]
+	N7 [label="Gene Synthesis Platforms" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N8 [label="Synthetic Gene Networks" color="#A2D0FF" fillcolor="#E8F0FF" shape=predefinedprocess style=filled]
+	N9 [label="DNA Synthesis" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	S1 [label="" color="#A2D0FF" fillcolor="#E8F0FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#A2D0FF" fillcolor="#E8F0FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#DCE775" fillcolor="#FCFCE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Bio_logic Gates {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Bio_logic Gates"
+		nest0_0 [label="Protein Design" color="#DCE775" fillcolor="#FCFCE7" shape=document style=filled]
+		nest0_1 [label="Regulatory Frameworks" color="#A2D0FF" fillcolor="#E8F0FF" shape=rectangle style=filled]
+		nest0_2 [label="Vaccine Synthesis" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+	}
+	subgraph cluster_Modular Biology Design {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Modular Biology Design"
+		nest1_0 [label="Bioremediation Applications" color="#A1887F" fillcolor="#EFEBE9" shape=multipledocuments style=filled]
+		nest1_1 [label="Genetic Circuit Design" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+		nest1_2 [label="Biofuel Production" color="#DCE775" fillcolor="#FCFCE7" shape=predefinedprocess style=filled]
+		nest1_3 [label="Novel Enzyme Creation" color="#DCE775" fillcolor="#FCFCE7" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest0_0 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest1_0 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N3 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#A2D0FF" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N5 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N6 -> M1 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#A2D0FF" penwidth=1.5 style=dashed label="simulates" dir=forward]
+	N0 -> M1 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N9 [color="#A2D0FF" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_357.txt b/test/diagrams/graph_hard/diagrams_357.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b5c83b920ec21ed65d87594e280b4617f076bc63
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_357.txt
@@ -0,0 +1,26 @@
+<Artificial Cells, connectedTo, Synthetic Organism Design>
+<Bio_computation, connectedTo, Bioremediation Applications>
+<Bio_computation, connectedTo, DNA Storage Technologies>
+<Biofuel Production, connectedTo, Novel Enzyme Creation>
+<Bioremediation Applications, connectedTo, Genetic Circuit Design>
+<DNA Storage Technologies, connectedTo, DNA Synthesis>
+<DNA Storage Technologies, connectedTo, Gene Synthesis Platforms>
+<Gene Synthesis Platforms, connectedTo, Synthetic Gene Networks>
+<Gene Synthesis Platforms, simulates, DNA Synthesis>
+<Gene Therapy Delivery Systems, connectedTo, Artificial Cells>
+<Gene Therapy Delivery Systems, connectedTo, Bio_computation>
+<Gene Therapy Delivery Systems, connectedTo, DNA Synthesis>
+<Gene Therapy Delivery Systems, connectedTo, Synthetic Gene Networks>
+<Gene Therapy Delivery Systems, connectedTo, Synthetic Organism Design>
+<Genetic Circuit Design, connectedTo, Biofuel Production>
+<Novel Enzyme Creation, connectedTo, Gene Therapy Delivery Systems>
+<Protein Design, connectedTo, Regulatory Frameworks>
+<Public Engagement, connectedTo, Bio_computation>
+<Regulatory Frameworks, connectedTo, Vaccine Synthesis>
+<Risk Assessment, connectedTo, Bio_computation>
+<Risk Assessment, connectedTo, DNA Synthesis>
+<Risk Assessment, connectedTo, Gene Therapy Delivery Systems>
+<Synthetic Gene Networks, connectedTo, DNA Synthesis>
+<Synthetic Gene Networks, connectedTo, Protein Design>
+<Synthetic Organism Design, connectedTo, Public Engagement>
+<Vaccine Synthesis, connectedTo, DNA Synthesis>
diff --git a/test/diagrams/graph_hard/diagrams_358.txt b/test/diagrams/graph_hard/diagrams_358.txt
new file mode 100644
index 0000000000000000000000000000000000000000..525c233a4e9316392264d937f91f161f46f9e877
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_358.txt
@@ -0,0 +1,26 @@
+<Adaptive Learning Systems, connectedTo, Blockchain for Educational Credentials>
+<Adaptive Learning Systems, connectedTo, Personalized Learning Paths>
+<Blockchain for Educational Credentials, connectedTo, EdTech Hardware Solutions>
+<Blockchain for Educational Credentials, connectedTo, Personalized Learning Paths>
+<Competency_Based Learning Platforms, connectedTo, Curriculum Digitization>
+<Competency_Based Learning Platforms, connectedTo, Simulations for Learning>
+<Curriculum Digitization, connectedTo, E_Learning Platform Design>
+<E_Learning Platform Design, connectedTo, Personalized Learning Paths>
+<EdTech Hardware Solutions, connectedTo, Personalized Learning Paths>
+<Educational Apps Development, connectedTo, Massive Open Online Courses>
+<Educational Data Mining, experiences_personalizes, Student Performance Tracking>
+<Formative Assessment Tools, licenses, Virtual Reality in Education>
+<Massive Open Online Courses, connectedTo, Student Performance Tracking>
+<Personalized Learning Paths, connectedTo, Competency_Based Learning Platforms>
+<Personalized Learning Paths, connectedTo, Educational Data Mining>
+<Personalized Learning Paths, connectedTo, Simulations for Learning>
+<Personalized Learning Paths, connectedTo, Student Information Systems>
+<Simulations for Learning, connectedTo, Formative Assessment Tools>
+<Simulations for Learning, connectedTo, Student Information Systems>
+<Student Information Systems, connectedTo, Open Educational Resources>
+<Student Performance Tracking, AI_applies, Open Educational Resources>
+<Student Performance Tracking, connectedTo, Competency_Based Learning Platforms>
+<Student Performance Tracking, connectedTo, Simulations for Learning>
+<Student Performance Tracking, connectedTo, Student Information Systems>
+<Virtual Labs, connectedTo, Adaptive Learning Systems>
+<Virtual Reality in Education, connectedTo, Educational Apps Development>
diff --git a/test/diagrams/graph_hard/diagrams_359.dot b/test/diagrams/graph_hard/diagrams_359.dot
new file mode 100644
index 0000000000000000000000000000000000000000..873d74bb30bbc888a49611af607c6ab2c5b59926
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_359.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=LR
+	N0 [label="Curriculum Digitization" color="#A188DB" fillcolor="#DED7F0" shape=preparation style=filled]
+	N1 [label="Badging and Certification Systems" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N2 [label="Virtual Classrooms" color="#D3EB9F" fillcolor="#F8FDD3" shape=rectangle style=filled]
+	N3 [label="Educational Apps Development" color="#D3EB9F" fillcolor="#F8FDD3" shape=rect style=filled]
+	N4 [label="Learning Analytics Dashboards" color="#D3EB9F" fillcolor="#F8FDD3" shape=parallelogram style=filled]
+	N5 [label="Competency_Based Learning Platforms" color="#A188DB" fillcolor="#DED7F0" shape=vnode_shape style=filled]
+	N6 [label="Interactive Content Creation" color="#D3EB9F" fillcolor="#F8FDD3" shape=action style=filled]
+	N7 [label="Gamified Learning" color="#A188DB" fillcolor="#DED7F0" shape=document style=filled]
+	N8 [label="Machine Learning for Learning Analytics" color="#A188DB" fillcolor="#DED7F0" shape=rectangle style=filled]
+	N9 [label="Learning Design Principles" color="#D3EB9F" fillcolor="#F8FDD3" shape=database style=filled]
+	S0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#AB47BC" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#AB47BC" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Professional Development for Educators {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Professional Development for Educators"
+		nest0_0 [label="Teacher Training Platforms" color="#D3EB9F" fillcolor="#F8FDD3" shape=preparation style=filled]
+		nest0_1 [label="AI in Education" color="#A188DB" fillcolor="#DED7F0" shape=diamond style=filled]
+	}
+	subgraph cluster_Augmented Reality in Education {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Augmented Reality in Education"
+		nest1_0 [label="Blockchain for Educational Credentials" color="#D3EB9F" fillcolor="#F8FDD3" shape=parallelogram style=filled]
+		nest1_1 [label="E_Learning Platform Design" color="#A188DB" fillcolor="#DED7F0" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N7 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#D3EB9F" penwidth=1.5 style=solid label="learning_gamifies" dir=forward]
+	N7 -> nest1_0 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N7 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N0 -> S2 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	S2 -> N4 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N5 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N4 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_359.txt b/test/diagrams/graph_hard/diagrams_359.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a7bec04c90da4daf88e276b3be07c87fe4b481a8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_359.txt
@@ -0,0 +1,23 @@
+<AI in Education, connectedTo, Gamified Learning>
+<Badging and Certification Systems, connectedTo, Learning Analytics Dashboards>
+<Badging and Certification Systems, connectedTo, Virtual Classrooms>
+<Blockchain for Educational Credentials, learning_gamifies, E_Learning Platform Design>
+<Competency_Based Learning Platforms, connectedTo, Interactive Content Creation>
+<Competency_Based Learning Platforms, connectedTo, Teacher Training Platforms>
+<Curriculum Digitization, connectedTo, Badging and Certification Systems>
+<Curriculum Digitization, connectedTo, Competency_Based Learning Platforms>
+<Curriculum Digitization, connectedTo, Learning Analytics Dashboards>
+<E_Learning Platform Design, connectedTo, Gamified Learning>
+<Educational Apps Development, connectedTo, Competency_Based Learning Platforms>
+<Educational Apps Development, connectedTo, Learning Analytics Dashboards>
+<Gamified Learning, connectedTo, Blockchain for Educational Credentials>
+<Gamified Learning, connectedTo, Machine Learning for Learning Analytics>
+<Interactive Content Creation, connectedTo, Gamified Learning>
+<Learning Analytics Dashboards, connectedTo, Competency_Based Learning Platforms>
+<Learning Analytics Dashboards, connectedTo, Gamified Learning>
+<Learning Analytics Dashboards, connectedTo, Learning Design Principles>
+<Learning Analytics Dashboards, connectedTo, Machine Learning for Learning Analytics>
+<Machine Learning for Learning Analytics, connectedTo, Learning Design Principles>
+<Teacher Training Platforms, connectedTo, AI in Education>
+<Virtual Classrooms, connectedTo, Educational Apps Development>
+<Virtual Classrooms, connectedTo, Learning Analytics Dashboards>
diff --git a/test/diagrams/graph_hard/diagrams_36.dot b/test/diagrams/graph_hard/diagrams_36.dot
new file mode 100644
index 0000000000000000000000000000000000000000..86aa399f560a46b24867818a4fbc85d425bbbbd7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_36.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=RL
+	N0 [label="Emergency Assistance" color="#FFE470" fillcolor="#FFFAE0" shape=document style=filled]
+	N1 [label="Museum Visit" color="#795548" fillcolor="#D7CCC8" shape=diamond style=filled]
+	N2 [label="Tour Guide Assignment" color="#E91E63" fillcolor="#FCE4EC" shape=rectangle style=filled]
+	N3 [label="Passport Renewal Assistance" color="#FFE470" fillcolor="#FFFAE0" shape=predefinedprocess style=filled]
+	N4 [label="Travel Insurance" color="#E91E63" fillcolor="#FCE4EC" shape=rectangle style=filled]
+	N5 [label="Restaurant Reservation" color="#795548" fillcolor="#D7CCC8" shape=predefinedprocess style=filled]
+	N6 [label="Cultural Immersion Program" color="#FFE470" fillcolor="#FFFAE0" shape=rect style=filled]
+	N7 [label="Concert Ticketing" color="#E91E63" fillcolor="#FCE4EC" shape=database style=filled]
+	N8 [label="Visa Application" color="#E91E63" fillcolor="#FCE4EC" shape=rectangle style=filled]
+	N9 [label="Baggage Handling" color="#FFE470" fillcolor="#FFFAE0" shape=rectangle style=filled]
+	N10 [label="Local Transport" color="#795548" fillcolor="#D7CCC8" shape=document style=filled]
+	N11 [label="Hotel Check_in" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N12 [label="Rental Car Pickup" color="#E91E63" fillcolor="#FCE4EC" shape=action style=filled]
+	N13 [label="Custom Tour Package Creation" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N14 [label="Return Trip" color="#E91E63" fillcolor="#FCE4EC" shape=rect style=filled]
+	N15 [label="Souvenir Shopping" color="#E91E63" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N16 [label="Event Reservation" color="#795548" fillcolor="#D7CCC8" shape=multipledocuments style=filled]
+	N17 [label="Duty_Free Shopping" color="#E91E63" fillcolor="#FCE4EC" shape=document style=filled]
+	N18 [label="Spa Appointment" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N19 [label="Currency Exchange" color="#FFE470" fillcolor="#FFFAE0" shape=parallelogram style=filled]
+	S0 [label="" color="#FFE470" fillcolor="#FFFAE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFE470" fillcolor="#FFFAE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#795548" fillcolor="#D7CCC8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Destination Selection {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Destination Selection"
+		nest0_0 [label="Historical Site Exploration" color="#795548" fillcolor="#D7CCC8" shape=multipledocuments style=filled]
+		nest0_1 [label="Tourist Information Desk" color="#FFE470" fillcolor="#FFFAE0" shape=predefinedprocess style=filled]
+		nest0_2 [label="Airport Transfer" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Lost and Found Service {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Lost and Found Service"
+		nest1_0 [label="Itinerary Planning" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+		nest1_1 [label="Trip Sharing" color="#FFE470" fillcolor="#FFFAE0" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#795548" penwidth=1.5 style=dashed label="visits" dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed label="sustains" dir=forward]
+	N12 -> N13 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N17 -> N18 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N18 -> N19 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N17 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N16 [color="#FFE470" penwidth=1.5 style=solid label="shares" dir=forward]
+	N2 -> S0 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#000000" penwidth=1.5 style=dashed label="returns" dir=forward]
+	S0 -> N11 [color="#E91E63" penwidth=1.5 style=dashed label="chooses" dir=forward]
+	N2 -> S1 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N18 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#000000" penwidth=1.5 style=solid label="partners" dir=forward]
+	N2 -> M0 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N9 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#FFE470" penwidth=1.5 style=solid label="transports" dir=forward]
+	M1 -> N18 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_36.txt b/test/diagrams/graph_hard/diagrams_36.txt
new file mode 100644
index 0000000000000000000000000000000000000000..717ad13405f0a4b016ba45cf80dbcb99b719e9b9
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_36.txt
@@ -0,0 +1,35 @@
+<Airport Transfer, connectedTo, Duty_Free Shopping>
+<Baggage Handling, connectedTo, Local Transport>
+<Concert Ticketing, connectedTo, Visa Application>
+<Cultural Immersion Program, connectedTo, Concert Ticketing>
+<Custom Tour Package Creation, connectedTo, Itinerary Planning>
+<Custom Tour Package Creation, connectedTo, Return Trip>
+<Duty_Free Shopping, connectedTo, Spa Appointment>
+<Emergency Assistance, connectedTo, Museum Visit>
+<Event Reservation, connectedTo, Duty_Free Shopping>
+<Historical Site Exploration, connectedTo, Tourist Information Desk>
+<Hotel Check_in, sustains, Rental Car Pickup>
+<Itinerary Planning, connectedTo, Trip Sharing>
+<Local Transport, visits, Hotel Check_in>
+<Museum Visit, connectedTo, Baggage Handling>
+<Museum Visit, connectedTo, Tour Guide Assignment>
+<Passport Renewal Assistance, connectedTo, Historical Site Exploration>
+<Passport Renewal Assistance, connectedTo, Spa Appointment>
+<Passport Renewal Assistance, connectedTo, Travel Insurance>
+<Rental Car Pickup, connectedTo, Custom Tour Package Creation>
+<Restaurant Reservation, connectedTo, Cultural Immersion Program>
+<Restaurant Reservation, transports, Spa Appointment>
+<Return Trip, connectedTo, Souvenir Shopping>
+<Souvenir Shopping, connectedTo, Event Reservation>
+<Spa Appointment, connectedTo, Currency Exchange>
+<Tour Guide Assignment, chooses, Hotel Check_in>
+<Tour Guide Assignment, connectedTo, Baggage Handling>
+<Tour Guide Assignment, connectedTo, Passport Renewal Assistance>
+<Tour Guide Assignment, connectedTo, Restaurant Reservation>
+<Tour Guide Assignment, connectedTo, Spa Appointment>
+<Tour Guide Assignment, partners, Travel Insurance>
+<Tour Guide Assignment, returns, Baggage Handling>
+<Tourist Information Desk, connectedTo, Airport Transfer>
+<Travel Insurance, connectedTo, Restaurant Reservation>
+<Trip Sharing, shares, Event Reservation>
+<Visa Application, connectedTo, Baggage Handling>
diff --git a/test/diagrams/graph_hard/diagrams_360.dot b/test/diagrams/graph_hard/diagrams_360.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f070258ed60194da0cb4d104de427d8a7c0acdde
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_360.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=RL
+	N0 [label="E_Learning Platform Design" color="#90A4AE" fillcolor="#ECEFF1" shape=predefinedprocess style=filled]
+	N1 [label="Educational Data Mining" color="#90A4AE" fillcolor="#ECEFF1" shape=rect style=filled]
+	N2 [label="Machine Learning for Learning Analytics" color="#E91E63" fillcolor="#F8BBD0" shape=document style=filled]
+	N3 [label="Blockchain for Educational Credentials" color="#E91E63" fillcolor="#F8BBD0" shape=inputoutput style=filled]
+	N4 [label="EdTech Hardware Solutions" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N5 [label="Adaptive Learning Systems" color="#DCE775" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	N6 [label="Augmented Reality in Education" color="#90A4AE" fillcolor="#ECEFF1" shape=parallelogram style=filled]
+	N7 [label="Virtual Classrooms" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N8 [label="Parent Engagement Tools" color="#E91E63" fillcolor="#F8BBD0" shape=document style=filled]
+	N9 [label="Gamified Learning" color="#E91E63" fillcolor="#F8BBD0" shape=inputoutput style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Online Tutoring Platforms {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Online Tutoring Platforms"
+		nest0_0 [label="Interactive Content Creation" color="#DCE775" fillcolor="#F9FBE7" shape=document style=filled]
+		nest0_1 [label="Simulations for Learning" color="#DCE775" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_AI in Education {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="AI in Education"
+		nest1_0 [label="Formative Assessment Tools" color="#DCE775" fillcolor="#F9FBE7" shape=database style=filled]
+		nest1_1 [label="Virtual Labs" color="#DCE775" fillcolor="#F9FBE7" shape=inputoutput style=filled]
+		nest1_2 [label="Teacher Training Platforms" color="#DCE775" fillcolor="#F9FBE7" shape=rect style=filled]
+		nest1_3 [label="Open Educational Resources" color="#90A4AE" fillcolor="#ECEFF1" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N3 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest1_0 [color="#DCE775" penwidth=1.5 style=dashed label="robotics_integrates" dir=forward]
+	nest1_3 -> N9 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#E91E63" penwidth=1.5 style=solid label="simulates" dir=forward]
+	M0 -> N3 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_360.txt b/test/diagrams/graph_hard/diagrams_360.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e7a3b541e6415d55a941458ca683890b39cc7430
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_360.txt
@@ -0,0 +1,24 @@
+<Adaptive Learning Systems, connectedTo, Augmented Reality in Education>
+<Adaptive Learning Systems, robotics_integrates, Formative Assessment Tools>
+<Augmented Reality in Education, connectedTo, Virtual Classrooms>
+<Blockchain for Educational Credentials, connectedTo, Adaptive Learning Systems>
+<Blockchain for Educational Credentials, connectedTo, EdTech Hardware Solutions>
+<Blockchain for Educational Credentials, connectedTo, Gamified Learning>
+<E_Learning Platform Design, connectedTo, Blockchain for Educational Credentials>
+<E_Learning Platform Design, connectedTo, Educational Data Mining>
+<EdTech Hardware Solutions, connectedTo, Adaptive Learning Systems>
+<EdTech Hardware Solutions, connectedTo, Augmented Reality in Education>
+<Educational Data Mining, connectedTo, Augmented Reality in Education>
+<Educational Data Mining, connectedTo, Machine Learning for Learning Analytics>
+<Educational Data Mining, simulates, Blockchain for Educational Credentials>
+<Formative Assessment Tools, connectedTo, Virtual Labs>
+<Interactive Content Creation, connectedTo, Simulations for Learning>
+<Machine Learning for Learning Analytics, connectedTo, Augmented Reality in Education>
+<Machine Learning for Learning Analytics, connectedTo, Blockchain for Educational Credentials>
+<Machine Learning for Learning Analytics, connectedTo, Interactive Content Creation>
+<Open Educational Resources, connectedTo, Gamified Learning>
+<Parent Engagement Tools, connectedTo, Gamified Learning>
+<Simulations for Learning, connectedTo, Blockchain for Educational Credentials>
+<Teacher Training Platforms, connectedTo, Open Educational Resources>
+<Virtual Classrooms, connectedTo, Parent Engagement Tools>
+<Virtual Labs, connectedTo, Teacher Training Platforms>
diff --git a/test/diagrams/graph_hard/diagrams_37.txt b/test/diagrams/graph_hard/diagrams_37.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4804e9d7e2f94d6dfc1dda56af8b1fc9e8f0f269
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_37.txt
@@ -0,0 +1,28 @@
+<Buyer Inquiry, connectedTo, Commission Distribution>
+<Buyer Inquiry, connectedTo, Eviction Process>
+<Buyer Inquiry, connectedTo, Investment Property Analysis>
+<Buyer Inquiry, connectedTo, Rental Agreement>
+<Closing Meeting, connectedTo, Market Trend Analysis>
+<Commission Distribution, connectedTo, Contract Review>
+<Commission Distribution, connectedTo, Rental Agreement>
+<Contract Review, connectedTo, Eviction Process>
+<Escrow Setup, connectedTo, Offer Submission>
+<Escrow Setup, connectedTo, Open House Event>
+<Escrow Setup, connectedTo, Property Management>
+<Escrow Setup, inspects, Price Negotiation>
+<Eviction Process, connectedTo, Investment Property Analysis>
+<HOA Management, connectedTo, Land Acquisition>
+<Land Acquisition, connectedTo, Buyer Inquiry>
+<Loan Pre_Approval, connectedTo, Escrow Setup>
+<Loan Pre_Approval, connectedTo, Open House Event>
+<Market Trend Analysis, connectedTo, Property Management>
+<Offer Submission, connectedTo, HOA Management>
+<Open House Event, connectedTo, Offer Submission>
+<Price Negotiation, connectedTo, Property Listing>
+<Property Listing, connectedTo, Eviction Process>
+<Property Management, advertises, Contract Review>
+<Property Management, closes, Open House Event>
+<Property Management, connectedTo, Closing Meeting>
+<Property Management, connectedTo, Contract Review>
+<Property Management, connectedTo, Offer Submission>
+<Rental Agreement, connectedTo, Contract Review>
diff --git a/test/diagrams/graph_hard/diagrams_38.dot b/test/diagrams/graph_hard/diagrams_38.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c2d4847ef5f863e8c4d6d1399ad0219ac8b26d82
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_38.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=RL
+	N0 [label="Legal Verification" color="#FFD54F" fillcolor="#FFF8E1" shape=database style=filled]
+	N1 [label="Property Marketing" color="#C2B2F0" fillcolor="#EFE6FF" shape=inputoutput style=filled]
+	N2 [label="Brokerage License Renewal" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+	N3 [label="Contract Review" color="#FFD54F" fillcolor="#FFF8E1" shape=document style=filled]
+	N4 [label="Agent Assignment" color="#73C6BC" fillcolor="#D0EFEE" shape=predefinedprocess style=filled]
+	N5 [label="Tenant Screening" color="#73C6BC" fillcolor="#D0EFEE" shape=rect style=filled]
+	N6 [label="Property Insurance" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N7 [label="Building Permit Application" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N8 [label="Closing Meeting" color="#C2B2F0" fillcolor="#EFE6FF" shape=hexagon style=filled]
+	N9 [label="HOA Management" color="#73C6BC" fillcolor="#D0EFEE" shape=database style=filled]
+	N10 [label="Price Negotiation" color="#73C6BC" fillcolor="#D0EFEE" shape=multipledocuments style=filled]
+	N11 [label="Title Check" color="#C2B2F0" fillcolor="#EFE6FF" shape=predefinedprocess style=filled]
+	N12 [label="Renovation Planning" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N13 [label="Property Listing" color="#73C6BC" fillcolor="#D0EFEE" shape=vnode_shape style=filled]
+	S0 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Loan Pre_Approval {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Loan Pre_Approval"
+		nest0_0 [label="Buyer Inquiry" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+		nest0_1 [label="Site Visit Scheduling" color="#C2B2F0" fillcolor="#EFE6FF" shape=inputoutput style=filled]
+		nest0_2 [label="Home Inspection" color="#FFD54F" fillcolor="#FFF8E1" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Property Appraisal {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Property Appraisal"
+		nest1_0 [label="Lease Renewal" color="#C2B2F0" fillcolor="#EFE6FF" shape=preparation style=filled]
+		nest1_1 [label="Escrow Setup" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+		nest1_2 [label="Zoning Compliance" color="#73C6BC" fillcolor="#D0EFEE" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed label="permits" dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid label="leases" dir=forward]
+	N12 -> N13 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N8 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest1_0 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N10 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	M0 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> M1 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	M1 -> N12 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_38.txt b/test/diagrams/graph_hard/diagrams_38.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f26f3d76472f762312ced159f7bbf7817a447830
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_38.txt
@@ -0,0 +1,30 @@
+<Agent Assignment, connectedTo, Renovation Planning>
+<Agent Assignment, connectedTo, Tenant Screening>
+<Brokerage License Renewal, connectedTo, Contract Review>
+<Brokerage License Renewal, connectedTo, Property Listing>
+<Brokerage License Renewal, connectedTo, Renovation Planning>
+<Brokerage License Renewal, connectedTo, Tenant Screening>
+<Building Permit Application, connectedTo, Closing Meeting>
+<Building Permit Application, connectedTo, Lease Renewal>
+<Buyer Inquiry, connectedTo, Site Visit Scheduling>
+<Closing Meeting, connectedTo, HOA Management>
+<Contract Review, connectedTo, Agent Assignment>
+<Contract Review, connectedTo, Tenant Screening>
+<Escrow Setup, connectedTo, Zoning Compliance>
+<HOA Management, connectedTo, Price Negotiation>
+<Home Inspection, connectedTo, Closing Meeting>
+<Lease Renewal, connectedTo, Escrow Setup>
+<Legal Verification, connectedTo, Property Marketing>
+<Legal Verification, connectedTo, Renovation Planning>
+<Legal Verification, connectedTo, Tenant Screening>
+<Price Negotiation, connectedTo, Renovation Planning>
+<Price Negotiation, connectedTo, Title Check>
+<Property Insurance, permits, Building Permit Application>
+<Property Marketing, connectedTo, Brokerage License Renewal>
+<Property Marketing, connectedTo, Tenant Screening>
+<Renovation Planning, connectedTo, Property Listing>
+<Site Visit Scheduling, connectedTo, Home Inspection>
+<Tenant Screening, connectedTo, Buyer Inquiry>
+<Tenant Screening, connectedTo, Property Insurance>
+<Title Check, leases, Renovation Planning>
+<Zoning Compliance, connectedTo, Price Negotiation>
diff --git a/test/diagrams/graph_hard/diagrams_39.dot b/test/diagrams/graph_hard/diagrams_39.dot
new file mode 100644
index 0000000000000000000000000000000000000000..60a2f3d3cc49f1ab682ee62065ab07bd9aad0730
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_39.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=LR
+	N0 [label="Eviction Process" color="#CDDC39" fillcolor="#E6EE9C" shape=multipledocuments style=filled]
+	N1 [label="Investment Property Analysis" color="#CDDC39" fillcolor="#E6EE9C" shape=database style=filled]
+	N2 [label="Zoning Compliance" color="#B0C5CD" fillcolor="#DFE7EB" shape=document style=filled]
+	N3 [label="Closing Meeting" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+	N4 [label="Escrow Setup" color="#00BCD4" fillcolor="#B2EBF2" shape=rect style=filled]
+	N5 [label="Mortgage Application Assistance" color="#B0C5CD" fillcolor="#DFE7EB" shape=action style=filled]
+	N6 [label="Ownership Transfer" color="#CDDC39" fillcolor="#E6EE9C" shape=multipledocuments style=filled]
+	N7 [label="Brokerage License Renewal" color="#00BCD4" fillcolor="#B2EBF2" shape=inputoutput style=filled]
+	N8 [label="Property Valuation" color="#00BCD4" fillcolor="#B2EBF2" shape=diamond style=filled]
+	N9 [label="Land Acquisition" color="#B0C5CD" fillcolor="#DFE7EB" shape=predefinedprocess style=filled]
+	N10 [label="Renovation Planning" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N11 [label="Maintenance Request" color="#B0C5CD" fillcolor="#DFE7EB" shape=action style=filled]
+	N12 [label="Property Tax Payment" color="#CDDC39" fillcolor="#E6EE9C" shape=preparation style=filled]
+	N13 [label="Offer Submission" color="#00BCD4" fillcolor="#B2EBF2" shape=multipledocuments style=filled]
+	N14 [label="Open House Event" color="#CDDC39" fillcolor="#E6EE9C" shape=rect style=filled]
+	S0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Property Insurance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Property Insurance"
+		nest0_0 [label="Document Signing" color="#CDDC39" fillcolor="#E6EE9C" shape=vnode_shape style=filled]
+		nest0_1 [label="Rental Agreement" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+		nest0_2 [label="HOA Management" color="#B0C5CD" fillcolor="#DFE7EB" shape=preparation style=filled]
+		nest0_3 [label="Contract Review" color="#CDDC39" fillcolor="#E6EE9C" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Building Permit Application {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Building Permit Application"
+		nest1_0 [label="Lease Renewal" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+		nest1_1 [label="Market Trend Analysis" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest1_2 [label="Site Visit Scheduling" color="#00BCD4" fillcolor="#B2EBF2" shape=parallelogram style=filled]
+		nest1_3 [label="Tax Assessment" color="#B0C5CD" fillcolor="#DFE7EB" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N1 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest1_0 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N6 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N7 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N0 -> S1 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	S1 -> N2 [color="#CDDC39" penwidth=1.5 style=dashed label="audits" dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N12 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_39.txt b/test/diagrams/graph_hard/diagrams_39.txt
new file mode 100644
index 0000000000000000000000000000000000000000..618974b4f86d56e5b6dcdfee06511d0770cfea7e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_39.txt
@@ -0,0 +1,36 @@
+<Brokerage License Renewal, connectedTo, Maintenance Request>
+<Brokerage License Renewal, connectedTo, Offer Submission>
+<Brokerage License Renewal, connectedTo, Property Tax Payment>
+<Brokerage License Renewal, connectedTo, Property Valuation>
+<Brokerage License Renewal, connectedTo, Renovation Planning>
+<Closing Meeting, connectedTo, Escrow Setup>
+<Closing Meeting, connectedTo, Lease Renewal>
+<Contract Review, connectedTo, Investment Property Analysis>
+<Document Signing, connectedTo, Rental Agreement>
+<Escrow Setup, connectedTo, Mortgage Application Assistance>
+<Eviction Process, audits, Zoning Compliance>
+<Eviction Process, connectedTo, Escrow Setup>
+<Eviction Process, connectedTo, Investment Property Analysis>
+<Eviction Process, connectedTo, Offer Submission>
+<Eviction Process, connectedTo, Property Tax Payment>
+<Eviction Process, connectedTo, Renovation Planning>
+<HOA Management, connectedTo, Contract Review>
+<Investment Property Analysis, connectedTo, Property Tax Payment>
+<Investment Property Analysis, connectedTo, Zoning Compliance>
+<Land Acquisition, connectedTo, Property Tax Payment>
+<Land Acquisition, connectedTo, Renovation Planning>
+<Lease Renewal, connectedTo, Market Trend Analysis>
+<Maintenance Request, connectedTo, Property Tax Payment>
+<Market Trend Analysis, connectedTo, Site Visit Scheduling>
+<Mortgage Application Assistance, connectedTo, Ownership Transfer>
+<Offer Submission, connectedTo, Open House Event>
+<Ownership Transfer, connectedTo, Brokerage License Renewal>
+<Ownership Transfer, connectedTo, Document Signing>
+<Property Tax Payment, connectedTo, Offer Submission>
+<Property Valuation, connectedTo, Land Acquisition>
+<Renovation Planning, connectedTo, Maintenance Request>
+<Rental Agreement, connectedTo, HOA Management>
+<Site Visit Scheduling, connectedTo, Tax Assessment>
+<Tax Assessment, connectedTo, Ownership Transfer>
+<Zoning Compliance, connectedTo, Closing Meeting>
+<Zoning Compliance, connectedTo, Property Tax Payment>
diff --git a/test/diagrams/graph_hard/diagrams_4.dot b/test/diagrams/graph_hard/diagrams_4.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0e074ccae17675c9928b122f39d418f9c9ebab28
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_4.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=RL
+	N0 [label="Prescription" color="#9C27B0" fillcolor="#E1BEE7" shape=inputoutput style=filled]
+	N1 [label="Health Screening" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N2 [label="Clinical Trial" color="#C0CA33" fillcolor="#F9FBE7" shape=rect style=filled]
+	N3 [label="Vaccination" color="#BCB88A" fillcolor="#F5F5DC" shape=preparation style=filled]
+	N4 [label="Physical Examination" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N5 [label="Pharmacy Order" color="#BCB88A" fillcolor="#F5F5DC" shape=parallelogram style=filled]
+	N6 [label="Medical History" color="#9C27B0" fillcolor="#E1BEE7" shape=database style=filled]
+	N7 [label="Patient Transfer" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N8 [label="Patient Education" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N9 [label="Blood Test" color="#9C27B0" fillcolor="#E1BEE7" shape=preparation style=filled]
+	N10 [label="Allergy Test" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N11 [label="Imaging Scan" color="#9C27B0" fillcolor="#E1BEE7" shape=diamond style=filled]
+	N12 [label="Telemedicine Consultation" color="#9C27B0" fillcolor="#E1BEE7" shape=database style=filled]
+	N13 [label="Symptom Monitoring" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N14 [label="Follow_up" color="#9C27B0" fillcolor="#E1BEE7" shape=database style=filled]
+	N15 [label="Surgery" color="#BCB88A" fillcolor="#F5F5DC" shape=rect style=filled]
+	S0 [label="" color="#C0CA33" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#C0CA33" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Lab Test {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Lab Test"
+		nest0_0 [label="Pain Management" color="#9C27B0" fillcolor="#E1BEE7" shape=document style=filled]
+		nest0_1 [label="Home Care Visit" color="#9C27B0" fillcolor="#E1BEE7" shape=rectangle style=filled]
+		nest0_2 [label="Device Implantation" color="#BCB88A" fillcolor="#F5F5DC" shape=parallelogram style=filled]
+		nest0_3 [label="Mental Health Assessment" color="#C0CA33" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Rehabilitation Therapy {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Rehabilitation Therapy"
+		nest1_0 [label="Genetic Counseling" color="#BCB88A" fillcolor="#F5F5DC" shape=action style=filled]
+		nest1_1 [label="Wound Care" color="#BCB88A" fillcolor="#F5F5DC" shape=document style=filled]
+		nest1_2 [label="Patient Intake" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed label="prevents" dir=forward]
+	nest0_1 -> nest0_2 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> nest0_0 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N1 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N9 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S0 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S1 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N12 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N15 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N6 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_4.txt b/test/diagrams/graph_hard/diagrams_4.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3c9c3b5ac720a2643e5377d918aab7034017d269
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_4.txt
@@ -0,0 +1,33 @@
+<Allergy Test, connectedTo, Imaging Scan>
+<Blood Test, connectedTo, Allergy Test>
+<Clinical Trial, connectedTo, Medical History>
+<Clinical Trial, connectedTo, Vaccination>
+<Device Implantation, connectedTo, Mental Health Assessment>
+<Follow_up, connectedTo, Surgery>
+<Genetic Counseling, connectedTo, Wound Care>
+<Health Screening, connectedTo, Clinical Trial>
+<Health Screening, connectedTo, Genetic Counseling>
+<Home Care Visit, connectedTo, Device Implantation>
+<Imaging Scan, connectedTo, Pain Management>
+<Imaging Scan, connectedTo, Telemedicine Consultation>
+<Medical History, connectedTo, Patient Transfer>
+<Mental Health Assessment, connectedTo, Health Screening>
+<Pain Management, prevents, Home Care Visit>
+<Patient Education, connectedTo, Blood Test>
+<Patient Education, connectedTo, Follow_up>
+<Patient Education, connectedTo, Telemedicine Consultation>
+<Patient Intake, connectedTo, Blood Test>
+<Patient Transfer, connectedTo, Patient Education>
+<Pharmacy Order, connectedTo, Imaging Scan>
+<Pharmacy Order, connectedTo, Medical History>
+<Pharmacy Order, connectedTo, Symptom Monitoring>
+<Physical Examination, connectedTo, Medical History>
+<Physical Examination, connectedTo, Pharmacy Order>
+<Prescription, connectedTo, Health Screening>
+<Prescription, connectedTo, Medical History>
+<Symptom Monitoring, connectedTo, Follow_up>
+<Telemedicine Consultation, connectedTo, Follow_up>
+<Telemedicine Consultation, connectedTo, Surgery>
+<Telemedicine Consultation, connectedTo, Symptom Monitoring>
+<Vaccination, connectedTo, Physical Examination>
+<Wound Care, connectedTo, Patient Intake>
diff --git a/test/diagrams/graph_hard/diagrams_40.txt b/test/diagrams/graph_hard/diagrams_40.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6810a0aeee96286f14de6ff53cab9c57c1323125
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_40.txt
@@ -0,0 +1,35 @@
+<Bomb Disposal, connectedTo, Fire Suppression>
+<Bomb Disposal, warns, Shelter Setup>
+<Crime Scene Analysis, connectedTo, Victim Support Services>
+<Cybersecurity Threat Response, connectedTo, Traffic Control>
+<Drug Interdiction, connectedTo, Inmate Transport>
+<Evacuation Planning, connectedTo, Public Warning>
+<Evidence Collection, connectedTo, First Aid Deployment>
+<Fire Suppression, connectedTo, Drug Interdiction>
+<First Aid Deployment, connectedTo, Crime Scene Analysis>
+<Incident Reporting, connectedTo, Drug Interdiction>
+<Incident Reporting, connectedTo, Surveillance Review>
+<Incident Reporting, connectedTo, Threat Assessment>
+<Inmate Transport, connectedTo, Cybersecurity Threat Response>
+<Inmate Transport, connectedTo, Search and Rescue Operations>
+<Law Enforcement Database Check, connectedTo, Rescue Coordination>
+<Law Enforcement Database Check, connectedTo, Surveillance Review>
+<Public Safety Training, connectedTo, First Aid Deployment>
+<Public Warning, connectedTo, Inmate Transport>
+<Public Warning, connectedTo, Responder Alert>
+<Rescue Coordination, connectedTo, Drug Interdiction>
+<Rescue Coordination, connectedTo, Incident Reporting>
+<Rescue Coordination, connectedTo, Inmate Transport>
+<Rescue Coordination, connectedTo, Surveillance Review>
+<Responder Alert, connectedTo, Bomb Disposal>
+<Search and Rescue Operations, connectedTo, Evidence Collection>
+<Shelter Setup, connectedTo, Public Safety Training>
+<Surveillance Review, connectedTo, Drug Interdiction>
+<Surveillance Review, connectedTo, Evacuation Planning>
+<Surveillance Review, connectedTo, Fire Suppression>
+<Threat Assessment, connectedTo, Bomb Disposal>
+<Threat Assessment, connectedTo, Crime Scene Analysis>
+<Threat Assessment, connectedTo, Evidence Collection>
+<Threat Assessment, connectedTo, Surveillance Review>
+<Traffic Control, connectedTo, Witness Interview>
+<Witness Interview, connectedTo, Drug Interdiction>
diff --git a/test/diagrams/graph_hard/diagrams_41.dot b/test/diagrams/graph_hard/diagrams_41.dot
new file mode 100644
index 0000000000000000000000000000000000000000..92ec2b234bf0418d66fd06ba911277a0c78b29e3
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_41.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=TB
+	N0 [label="Public Safety Training" color="#03A9F4" fillcolor="#B3E5FC" shape=document style=filled]
+	N1 [label="K9 Unit Deployment" color="#E91E63" fillcolor="#FCE4EC" shape=rect style=filled]
+	N2 [label="Incident Reporting" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+	N3 [label="Law Enforcement Database Check" color="#03A9F4" fillcolor="#B3E5FC" shape=predefinedprocess style=filled]
+	N4 [label="Crime Prevention Programs" color="#03A9F4" fillcolor="#B3E5FC" shape=database style=filled]
+	N5 [label="Victim Support Services" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N6 [label="Threat Assessment" color="#03A9F4" fillcolor="#B3E5FC" shape=predefinedprocess style=filled]
+	N7 [label="Witness Interview" color="#82DAFF" fillcolor="#C8EDFF" shape=preparation style=filled]
+	N8 [label="Crime Scene Analysis" color="#E91E63" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+	N9 [label="Incident Command System Activation" color="#03A9F4" fillcolor="#B3E5FC" shape=database style=filled]
+	N10 [label="SWAT Team Activation" color="#03A9F4" fillcolor="#B3E5FC" shape=document style=filled]
+	N11 [label="Surveillance Review" color="#03A9F4" fillcolor="#B3E5FC" shape=document style=filled]
+	N12 [label="Traffic Control" color="#E91E63" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+	N13 [label="Court Testimony" color="#03A9F4" fillcolor="#B3E5FC" shape=rectangle style=filled]
+	S1 [label="" color="#03A9F4" fillcolor="#B3E5FC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#03A9F4" fillcolor="#B3E5FC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Evacuation Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Evacuation Planning"
+		nest0_0 [label="Responder Alert" color="#82DAFF" fillcolor="#C8EDFF" shape=action style=filled]
+		nest0_1 [label="Fire Suppression" color="#03A9F4" fillcolor="#B3E5FC" shape=action style=filled]
+	}
+	subgraph cluster_Patrol Scheduling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Patrol Scheduling"
+		nest1_0 [label="Disaster Relief Coordination" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+		nest1_1 [label="Emergency Medical Service" color="#E91E63" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+		nest1_2 [label="Hazard Detection" color="#82DAFF" fillcolor="#C8EDFF" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest0_0 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N4 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	S1 -> N3 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N10 -> M0 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N11 -> M0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N13 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	N8 -> M1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N6 -> M1 [color="#000000" penwidth=1.5 style=dashed label="trains" dir=forward]
+	N0 -> M1 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	M1 -> N11 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	M2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_41.txt b/test/diagrams/graph_hard/diagrams_41.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3a6a92e25f1488a2f1a2dc180d33213f44630249
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_41.txt
@@ -0,0 +1,30 @@
+<Crime Prevention Programs, connectedTo, Victim Support Services>
+<Crime Scene Analysis, connectedTo, Incident Command System Activation>
+<Crime Scene Analysis, connectedTo, Surveillance Review>
+<Disaster Relief Coordination, connectedTo, Emergency Medical Service>
+<Emergency Medical Service, connectedTo, Hazard Detection>
+<Fire Suppression, connectedTo, Victim Support Services>
+<Hazard Detection, connectedTo, Crime Prevention Programs>
+<Incident Command System Activation, connectedTo, SWAT Team Activation>
+<Incident Reporting, connectedTo, Law Enforcement Database Check>
+<K9 Unit Deployment, connectedTo, Court Testimony>
+<K9 Unit Deployment, connectedTo, Incident Reporting>
+<K9 Unit Deployment, connectedTo, Law Enforcement Database Check>
+<K9 Unit Deployment, connectedTo, Responder Alert>
+<K9 Unit Deployment, connectedTo, SWAT Team Activation>
+<K9 Unit Deployment, connectedTo, Victim Support Services>
+<Law Enforcement Database Check, connectedTo, Crime Prevention Programs>
+<Law Enforcement Database Check, connectedTo, Disaster Relief Coordination>
+<Public Safety Training, connectedTo, K9 Unit Deployment>
+<Public Safety Training, connectedTo, Law Enforcement Database Check>
+<Public Safety Training, connectedTo, Surveillance Review>
+<Responder Alert, connectedTo, Fire Suppression>
+<SWAT Team Activation, connectedTo, Court Testimony>
+<SWAT Team Activation, connectedTo, Surveillance Review>
+<Surveillance Review, connectedTo, Court Testimony>
+<Surveillance Review, connectedTo, Traffic Control>
+<Threat Assessment, connectedTo, Witness Interview>
+<Threat Assessment, trains, Surveillance Review>
+<Traffic Control, connectedTo, Court Testimony>
+<Victim Support Services, connectedTo, Threat Assessment>
+<Witness Interview, connectedTo, Crime Scene Analysis>
diff --git a/test/diagrams/graph_hard/diagrams_42.dot b/test/diagrams/graph_hard/diagrams_42.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a3674249a27a759a1b41fc6d04f69999a3aad8c4
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_42.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=BT
+	N0 [label="Post_Incident Review" color="#3F51B5" fillcolor="#C5CAE9" shape=predefinedprocess style=filled]
+	N1 [label="Drug Interdiction" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+	N2 [label="Emergency Dispatch" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+	N3 [label="Shelter Setup" color="#3F51B5" fillcolor="#C5CAE9" shape=rectangle style=filled]
+	N4 [label="Public Safety Training" color="#388E3C" fillcolor="#F1F8E9" shape=rectangle style=filled]
+	N5 [label="Cybersecurity Threat Response" color="#3F51B5" fillcolor="#C5CAE9" shape=predefinedprocess style=filled]
+	N6 [label="Responder Alert" color="#3F51B5" fillcolor="#C5CAE9" shape=inputoutput style=filled]
+	N7 [label="K9 Unit Deployment" color="#388E3C" fillcolor="#F1F8E9" shape=document style=filled]
+	N8 [label="Evacuation Planning" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N9 [label="Crime Scene Analysis" color="#8C9EFF" fillcolor="#D3D7EB" shape=multipledocuments style=filled]
+	N10 [label="Emergency Medical Service" color="#388E3C" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N11 [label="Crime Prevention Programs" color="#3F51B5" fillcolor="#C5CAE9" shape=predefinedprocess style=filled]
+	S0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Bomb Disposal {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Bomb Disposal"
+		nest0_0 [label="Hazard Detection" color="#3F51B5" fillcolor="#C5CAE9" shape=action style=filled]
+		nest0_1 [label="Traffic Control" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+	}
+	subgraph cluster_Witness Interview {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Witness Interview"
+		nest1_0 [label="Court Testimony" color="#3F51B5" fillcolor="#C5CAE9" shape=rectangle style=filled]
+		nest1_1 [label="Incident Command System Activation" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+	}
+	N0 -> N1 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N2 -> nest0_0 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed label="rescues" dir=forward]
+	N8 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N10 [color="#8C9EFF" penwidth=1.5 style=dashed label="interviews" dir=forward]
+	N8 -> S0 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#8C9EFF" penwidth=1.5 style=dashed label="educates" dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> S1 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#8C9EFF" penwidth=1.5 style=solid label="responds" dir=forward]
+	S1 -> N10 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N2 [color="#3F51B5" penwidth=1.5 style=dashed label="dispatches" dir=forward]
+	S1 -> N4 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S2 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N6 -> M1 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#8C9EFF" penwidth=1.5 style=dashed label="certifies" dir=forward]
+	M1 -> N11 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_42.txt b/test/diagrams/graph_hard/diagrams_42.txt
new file mode 100644
index 0000000000000000000000000000000000000000..affdc73edb90054ecb459da4640a9eb4cb66744a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_42.txt
@@ -0,0 +1,30 @@
+<Court Testimony, rescues, Incident Command System Activation>
+<Crime Scene Analysis, connectedTo, Emergency Medical Service>
+<Cybersecurity Threat Response, connectedTo, Crime Prevention Programs>
+<Cybersecurity Threat Response, connectedTo, Emergency Medical Service>
+<Cybersecurity Threat Response, connectedTo, K9 Unit Deployment>
+<Cybersecurity Threat Response, connectedTo, Responder Alert>
+<Drug Interdiction, connectedTo, Emergency Dispatch>
+<Emergency Dispatch, connectedTo, Hazard Detection>
+<Emergency Dispatch, connectedTo, Shelter Setup>
+<Emergency Medical Service, connectedTo, Crime Prevention Programs>
+<Evacuation Planning, connectedTo, Court Testimony>
+<Evacuation Planning, connectedTo, Crime Scene Analysis>
+<Evacuation Planning, connectedTo, Emergency Medical Service>
+<Evacuation Planning, educates, Crime Prevention Programs>
+<Hazard Detection, connectedTo, Traffic Control>
+<Incident Command System Activation, interviews, Emergency Medical Service>
+<K9 Unit Deployment, connectedTo, Evacuation Planning>
+<Post_Incident Review, certifies, Crime Prevention Programs>
+<Post_Incident Review, connectedTo, Drug Interdiction>
+<Post_Incident Review, connectedTo, Emergency Medical Service>
+<Post_Incident Review, connectedTo, Public Safety Training>
+<Post_Incident Review, connectedTo, Responder Alert>
+<Post_Incident Review, dispatches, Emergency Dispatch>
+<Post_Incident Review, responds, Crime Prevention Programs>
+<Public Safety Training, connectedTo, Cybersecurity Threat Response>
+<Public Safety Training, connectedTo, Responder Alert>
+<Responder Alert, connectedTo, Crime Prevention Programs>
+<Responder Alert, connectedTo, K9 Unit Deployment>
+<Shelter Setup, connectedTo, Public Safety Training>
+<Traffic Control, connectedTo, Drug Interdiction>
diff --git a/test/diagrams/graph_hard/diagrams_43.dot b/test/diagrams/graph_hard/diagrams_43.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5b179cd92448575d1598b936f0c45d7813f86dc1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_43.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=BT
+	N0 [label="Trailer Production" color="#D3EB9F" fillcolor="#F8FDD3" shape=rect style=filled]
+	N1 [label="Premiere Event" color="#673AB7" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N2 [label="Merchandise Creation" color="#FFE69C" fillcolor="#FFF9D4" shape=predefinedprocess style=filled]
+	N3 [label="Press Junket" color="#D3EB9F" fillcolor="#F8FDD3" shape=document style=filled]
+	N4 [label="Audience Feedback" color="#FFE69C" fillcolor="#FFF9D4" shape=inputoutput style=filled]
+	N5 [label="Location Scouting" color="#FFE69C" fillcolor="#FFF9D4" shape=predefinedprocess style=filled]
+	N6 [label="Visual Effects" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N7 [label="Footage Review" color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N8 [label="Casting Call" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N9 [label="Red Carpet Event" color="#D3EB9F" fillcolor="#F8FDD3" shape=vnode_shape style=filled]
+	N10 [label="Intellectual Property Protection" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+	N11 [label="Special Effects Design" color="#D3EB9F" fillcolor="#F8FDD3" shape=rect style=filled]
+	N12 [label="Scene Shooting" color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N13 [label="Post_Production Audio Mixing" color="#D3EB9F" fillcolor="#F8FDD3" shape=inputoutput style=filled]
+	S0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#673AB7" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#673AB7" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Stunt Coordination {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Stunt Coordination"
+		nest0_0 [label="Marketing Campaign" color="#FFE69C" fillcolor="#FFF9D4" shape=rect style=filled]
+		nest0_1 [label="Talent Management" color="#673AB7" fillcolor="#D1C4E9" shape=predefinedprocess style=filled]
+		nest0_2 [label="Costume Design" color="#D3EB9F" fillcolor="#F8FDD3" shape=inputoutput style=filled]
+		nest0_3 [label="Streaming Setup" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	}
+	subgraph cluster_Scene Scheduling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Scene Scheduling"
+		nest1_0 [label="Sound Engineering" color="#673AB7" fillcolor="#D1C4E9" shape=vnode_shape style=filled]
+		nest1_1 [label="Ticketing Sales" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid label="audits" dir=forward]
+	N3 -> N4 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#D3EB9F" penwidth=1.5 style=dashed label="mixes" dir=forward]
+	N6 -> N7 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#FFE69C" penwidth=1.5 style=solid label="edits" dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFE69C" penwidth=1.5 style=dashed label="licenses" dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N7 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N3 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S0 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N8 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M0 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N12 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#D3EB9F" penwidth=1.5 style=dashed label="films" dir=forward]
+	N2 -> M1 [color="#FFE69C" penwidth=1.5 style=dashed label="preserves" dir=forward]
+	M1 -> N8 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_43.txt b/test/diagrams/graph_hard/diagrams_43.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bc45b667cf7f1b5cedcb0d017fc1ceda4029a6b6
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_43.txt
@@ -0,0 +1,31 @@
+<Audience Feedback, connectedTo, Location Scouting>
+<Casting Call, connectedTo, Red Carpet Event>
+<Casting Call, connectedTo, Scene Shooting>
+<Casting Call, connectedTo, Special Effects Design>
+<Costume Design, connectedTo, Streaming Setup>
+<Footage Review, connectedTo, Casting Call>
+<Footage Review, connectedTo, Intellectual Property Protection>
+<Footage Review, connectedTo, Post_Production Audio Mixing>
+<Footage Review, connectedTo, Scene Shooting>
+<Footage Review, connectedTo, Special Effects Design>
+<Intellectual Property Protection, edits, Special Effects Design>
+<Location Scouting, mixes, Visual Effects>
+<Marketing Campaign, licenses, Talent Management>
+<Merchandise Creation, audits, Press Junket>
+<Merchandise Creation, connectedTo, Sound Engineering>
+<Merchandise Creation, preserves, Casting Call>
+<Premiere Event, connectedTo, Marketing Campaign>
+<Premiere Event, connectedTo, Merchandise Creation>
+<Press Junket, connectedTo, Audience Feedback>
+<Press Junket, films, Casting Call>
+<Red Carpet Event, connectedTo, Intellectual Property Protection>
+<Red Carpet Event, connectedTo, Scene Shooting>
+<Scene Shooting, connectedTo, Post_Production Audio Mixing>
+<Sound Engineering, connectedTo, Ticketing Sales>
+<Special Effects Design, connectedTo, Scene Shooting>
+<Streaming Setup, connectedTo, Footage Review>
+<Talent Management, connectedTo, Costume Design>
+<Ticketing Sales, connectedTo, Press Junket>
+<Trailer Production, connectedTo, Premiere Event>
+<Trailer Production, connectedTo, Scene Shooting>
+<Visual Effects, connectedTo, Footage Review>
diff --git a/test/diagrams/graph_hard/diagrams_44.dot b/test/diagrams/graph_hard/diagrams_44.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ccf59aa05a637681fbec6f08e332413f7af00ddf
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_44.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=BT
+	N0 [label="Licensing Approval" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N1 [label="Streaming Setup" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N2 [label="Scene Shooting" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N3 [label="Costume Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=preparation style=filled]
+	N4 [label="Actor Rehearsal" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N5 [label="Trailer Production" color="#FF8A65" fillcolor="#FBE9E7" shape=vnode_shape style=filled]
+	N6 [label="Lighting Setup" color="#FFDA4E" fillcolor="#FFE88D" shape=predefinedprocess style=filled]
+	N7 [label="Special Effects Design" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N8 [label="Ticketing Sales" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N9 [label="Audience Feedback" color="#FFDA4E" fillcolor="#FFE88D" shape=inputoutput style=filled]
+	S0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FF8A65" fillcolor="#FBE9E7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Location Scouting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Location Scouting"
+		nest0_0 [label="Intellectual Property Protection" color="#FF8A65" fillcolor="#FBE9E7" shape=action style=filled]
+		nest0_1 [label="Fan Engagement Strategy" color="#FFDA4E" fillcolor="#FFE88D" shape=rect style=filled]
+		nest0_2 [label="Stunt Coordination" color="#FF8A65" fillcolor="#FBE9E7" shape=database style=filled]
+		nest0_3 [label="Sponsorship Acquisition" color="#FF8A65" fillcolor="#FBE9E7" shape=database style=filled]
+	}
+	subgraph cluster_Film Festival Submission {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Film Festival Submission"
+		nest1_0 [label="Broadcast Scheduling" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+		nest1_1 [label="Press Junket" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+		nest1_2 [label="Post_Production Audio Mixing" color="#FFDA4E" fillcolor="#FFE88D" shape=hexagon style=filled]
+		nest1_3 [label="Animation Production" color="#FFDA4E" fillcolor="#FFE88D" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#CB9BE1" penwidth=1.5 style=dashed label="manages" dir=forward]
+	N7 -> N8 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest1_0 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N5 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N6 -> S0 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	M1 -> N8 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_44.txt b/test/diagrams/graph_hard/diagrams_44.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bea5dc381c2ff47f8f6b2e9d03efe96f23a3f847
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_44.txt
@@ -0,0 +1,25 @@
+<Actor Rehearsal, connectedTo, Trailer Production>
+<Animation Production, connectedTo, Trailer Production>
+<Broadcast Scheduling, connectedTo, Press Junket>
+<Costume Design, connectedTo, Actor Rehearsal>
+<Fan Engagement Strategy, connectedTo, Stunt Coordination>
+<Intellectual Property Protection, connectedTo, Fan Engagement Strategy>
+<Licensing Approval, connectedTo, Streaming Setup>
+<Licensing Approval, connectedTo, Ticketing Sales>
+<Lighting Setup, connectedTo, Audience Feedback>
+<Lighting Setup, connectedTo, Broadcast Scheduling>
+<Lighting Setup, connectedTo, Ticketing Sales>
+<Lighting Setup, manages, Special Effects Design>
+<Post_Production Audio Mixing, connectedTo, Animation Production>
+<Press Junket, connectedTo, Post_Production Audio Mixing>
+<Scene Shooting, connectedTo, Costume Design>
+<Special Effects Design, connectedTo, Ticketing Sales>
+<Sponsorship Acquisition, connectedTo, Trailer Production>
+<Streaming Setup, connectedTo, Scene Shooting>
+<Streaming Setup, connectedTo, Ticketing Sales>
+<Stunt Coordination, connectedTo, Sponsorship Acquisition>
+<Ticketing Sales, connectedTo, Audience Feedback>
+<Ticketing Sales, connectedTo, Intellectual Property Protection>
+<Trailer Production, connectedTo, Audience Feedback>
+<Trailer Production, connectedTo, Lighting Setup>
+<Trailer Production, connectedTo, Ticketing Sales>
diff --git a/test/diagrams/graph_hard/diagrams_45.dot b/test/diagrams/graph_hard/diagrams_45.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a03730049861ba6d128125c44a74f6822cdc80bf
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_45.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=RL
+	N0 [label="Streaming Setup" color="#00BCD4" fillcolor="#B2EBF2" shape=multipledocuments style=filled]
+	N1 [label="Editing Process" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N2 [label="Game Development" color="#9575CD" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	N3 [label="Script Writing" color="#00BCD4" fillcolor="#B2EBF2" shape=rect style=filled]
+	N4 [label="Intellectual Property Protection" color="#00BCD4" fillcolor="#B2EBF2" shape=database style=filled]
+	N5 [label="Press Junket" color="#9575CD" fillcolor="#EDE7F6" shape=inputoutput style=filled]
+	N6 [label="Costume Design" color="#F06292" fillcolor="#FCE4EC" shape=preparation style=filled]
+	N7 [label="Scene Scheduling" color="#9575CD" fillcolor="#EDE7F6" shape=diamond style=filled]
+	N8 [label="Live Performance" color="#F06292" fillcolor="#FCE4EC" shape=vnode_shape style=filled]
+	N9 [label="Film Distribution" color="#F06292" fillcolor="#FCE4EC" shape=rect style=filled]
+	N10 [label="Talent Management" color="#9575CD" fillcolor="#EDE7F6" shape=document style=filled]
+	N11 [label="Location Scouting" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+	N12 [label="Marketing Campaign" color="#9575CD" fillcolor="#EDE7F6" shape=action style=filled]
+	N13 [label="Sponsorship Acquisition" color="#9575CD" fillcolor="#EDE7F6" shape=vnode_shape style=filled]
+	N14 [label="Scene Shooting" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	S1 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Footage Review {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Footage Review"
+		nest0_0 [label="Film Festival Submission" color="#00BCD4" fillcolor="#B2EBF2" shape=rect style=filled]
+		nest0_1 [label="Audience Feedback" color="#F06292" fillcolor="#FCE4EC" shape=rectangle style=filled]
+		nest0_2 [label="Ticketing Sales" color="#F06292" fillcolor="#FCE4EC" shape=rectangle style=filled]
+	}
+	subgraph cluster_Licensing Approval {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Licensing Approval"
+		nest1_0 [label="Sound Engineering" color="#F06292" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+		nest1_1 [label="Concert Promotion" color="#F06292" fillcolor="#FCE4EC" shape=database style=filled]
+		nest1_2 [label="Broadcast Scheduling" color="#9575CD" fillcolor="#EDE7F6" shape=action style=filled]
+		nest1_3 [label="Set Construction" color="#F06292" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#F06292" penwidth=1.5 style=solid label="screens" dir=forward]
+	N3 -> N4 [color="#F06292" penwidth=1.5 style=solid label="critiques" dir=forward]
+	N4 -> N5 [color="#00BCD4" penwidth=1.5 style=solid label="innovates" dir=forward]
+	N5 -> N6 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed label="protects" dir=forward]
+	N9 -> nest0_0 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N2 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#9575CD" penwidth=1.5 style=solid label="secures" dir=forward]
+	nest1_2 -> nest1_3 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest1_0 [color="#000000" penwidth=1.5 style=solid label="edits" dir=forward]
+	nest1_3 -> N14 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	N9 -> S1 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	S2 -> N13 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N4 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_45.txt b/test/diagrams/graph_hard/diagrams_45.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b267ca232fc5a2fc2ef9ce6f58bf9af9f84678cc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_45.txt
@@ -0,0 +1,32 @@
+<Audience Feedback, protects, Ticketing Sales>
+<Broadcast Scheduling, connectedTo, Set Construction>
+<Concert Promotion, secures, Broadcast Scheduling>
+<Costume Design, connectedTo, Location Scouting>
+<Costume Design, connectedTo, Marketing Campaign>
+<Costume Design, connectedTo, Scene Scheduling>
+<Costume Design, connectedTo, Sponsorship Acquisition>
+<Editing Process, connectedTo, Game Development>
+<Editing Process, connectedTo, Sponsorship Acquisition>
+<Film Distribution, connectedTo, Film Festival Submission>
+<Film Distribution, connectedTo, Location Scouting>
+<Film Distribution, connectedTo, Marketing Campaign>
+<Film Distribution, connectedTo, Talent Management>
+<Film Festival Submission, connectedTo, Audience Feedback>
+<Game Development, connectedTo, Intellectual Property Protection>
+<Game Development, connectedTo, Sponsorship Acquisition>
+<Game Development, screens, Script Writing>
+<Intellectual Property Protection, innovates, Press Junket>
+<Live Performance, connectedTo, Film Distribution>
+<Location Scouting, connectedTo, Marketing Campaign>
+<Marketing Campaign, connectedTo, Sponsorship Acquisition>
+<Marketing Campaign, edits, Sound Engineering>
+<Press Junket, connectedTo, Costume Design>
+<Scene Scheduling, connectedTo, Live Performance>
+<Script Writing, critiques, Intellectual Property Protection>
+<Set Construction, connectedTo, Scene Shooting>
+<Sound Engineering, connectedTo, Concert Promotion>
+<Sponsorship Acquisition, connectedTo, Scene Shooting>
+<Streaming Setup, connectedTo, Editing Process>
+<Streaming Setup, connectedTo, Intellectual Property Protection>
+<Talent Management, connectedTo, Location Scouting>
+<Ticketing Sales, connectedTo, Game Development>
diff --git a/test/diagrams/graph_hard/diagrams_46.dot b/test/diagrams/graph_hard/diagrams_46.dot
new file mode 100644
index 0000000000000000000000000000000000000000..00b7753ce21e3eedab5e3292139aadbeacfa4009
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_46.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=BT
+	N0 [label="Ecological Footprint Analysis" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+	N1 [label="Hazardous Material Handling" color="#DCE775" fillcolor="#FCFCE7" shape=predefinedprocess style=filled]
+	N2 [label="Green Certification" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+	N3 [label="Sustainability Review" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N4 [label="Soil Testing" color="#DCE775" fillcolor="#FCFCE7" shape=vnode_shape style=filled]
+	N5 [label="Waste Water Treatment" color="#FFEB3B" fillcolor="#FFF9C4" shape=rectangle style=filled]
+	N6 [label="Species Reintroduction" color="#FFEB3B" fillcolor="#FFF9C4" shape=parallelogram style=filled]
+	N7 [label="Landfill Management" color="#DCE775" fillcolor="#FCFCE7" shape=document style=filled]
+	N8 [label="Resource Recovery" color="#FF9800" fillcolor="#FFE0B2" shape=diamond style=filled]
+	N9 [label="Renewable Energy Project Development" color="#FF9800" fillcolor="#FFE0B2" shape=predefinedprocess style=filled]
+	N10 [label="Pollution Control Technology" color="#FFEB3B" fillcolor="#FFF9C4" shape=vnode_shape style=filled]
+	N11 [label="Regulatory Compliance" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N12 [label="Renewable Energy Grid Integration" color="#DCE775" fillcolor="#FCFCE7" shape=predefinedprocess style=filled]
+	N13 [label="Resource Tracking" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N14 [label="Recycling Process" color="#FF9800" fillcolor="#FFE0B2" shape=database style=filled]
+	N15 [label="Noise Pollution Measurement" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N16 [label="Citizen Science Initiative" color="#DCE775" fillcolor="#FCFCE7" shape=hexagon style=filled]
+	N17 [label="Environmental Impact Assessment" color="#FF9800" fillcolor="#FFE0B2" shape=document style=filled]
+	S0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#DCE775" fillcolor="#FCFCE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFEB3B" fillcolor="#FFF9C4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Waste Collection {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Waste Collection"
+		nest0_0 [label="Water Sampling" color="#FF9800" fillcolor="#FFE0B2" shape=multipledocuments style=filled]
+		nest0_1 [label="Conservation Easement" color="#FF9800" fillcolor="#FFE0B2" shape=action style=filled]
+		nest0_2 [label="Ocean Cleanup" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	}
+	subgraph cluster_Biodiversity Conservation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Biodiversity Conservation"
+		nest1_0 [label="Groundwater Monitoring" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+		nest1_1 [label="Climate Modeling" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+		nest1_2 [label="Pollution Alert" color="#DCE775" fillcolor="#FCFCE7" shape=multipledocuments style=filled]
+		nest1_3 [label="Air Quality Monitoring" color="#FFEB3B" fillcolor="#FFF9C4" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid label="educates" dir=forward]
+	N4 -> N5 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#FFEB3B" penwidth=1.5 style=solid label="samples" dir=forward]
+	N13 -> N14 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N12 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#DCE775" penwidth=1.5 style=dashed label="calculates" dir=forward]
+	nest1_2 -> nest1_3 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N15 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N0 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N5 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#FFEB3B" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N11 [color="#FFEB3B" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_46.txt b/test/diagrams/graph_hard/diagrams_46.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c6fb1a248d4bc66f158ecc975cfd47fecbf9ccd8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_46.txt
@@ -0,0 +1,41 @@
+<Air Quality Monitoring, connectedTo, Noise Pollution Measurement>
+<Citizen Science Initiative, connectedTo, Environmental Impact Assessment>
+<Climate Modeling, calculates, Pollution Alert>
+<Conservation Easement, connectedTo, Ocean Cleanup>
+<Ecological Footprint Analysis, connectedTo, Hazardous Material Handling>
+<Ecological Footprint Analysis, connectedTo, Pollution Control Technology>
+<Ecological Footprint Analysis, connectedTo, Regulatory Compliance>
+<Ecological Footprint Analysis, connectedTo, Renewable Energy Project Development>
+<Ecological Footprint Analysis, connectedTo, Resource Tracking>
+<Ecological Footprint Analysis, connectedTo, Species Reintroduction>
+<Ecological Footprint Analysis, connectedTo, Waste Water Treatment>
+<Green Certification, connectedTo, Regulatory Compliance>
+<Green Certification, connectedTo, Sustainability Review>
+<Green Certification, connectedTo, Waste Water Treatment>
+<Green Certification, connectedTo, Water Sampling>
+<Groundwater Monitoring, connectedTo, Climate Modeling>
+<Hazardous Material Handling, connectedTo, Green Certification>
+<Hazardous Material Handling, connectedTo, Species Reintroduction>
+<Hazardous Material Handling, connectedTo, Waste Water Treatment>
+<Landfill Management, connectedTo, Resource Recovery>
+<Noise Pollution Measurement, connectedTo, Citizen Science Initiative>
+<Ocean Cleanup, connectedTo, Renewable Energy Grid Integration>
+<Pollution Alert, connectedTo, Air Quality Monitoring>
+<Pollution Control Technology, connectedTo, Regulatory Compliance>
+<Recycling Process, connectedTo, Noise Pollution Measurement>
+<Regulatory Compliance, connectedTo, Renewable Energy Grid Integration>
+<Renewable Energy Grid Integration, samples, Resource Tracking>
+<Renewable Energy Project Development, connectedTo, Pollution Control Technology>
+<Resource Recovery, connectedTo, Renewable Energy Project Development>
+<Resource Tracking, connectedTo, Groundwater Monitoring>
+<Resource Tracking, connectedTo, Recycling Process>
+<Soil Testing, connectedTo, Regulatory Compliance>
+<Soil Testing, connectedTo, Species Reintroduction>
+<Soil Testing, connectedTo, Waste Water Treatment>
+<Species Reintroduction, connectedTo, Landfill Management>
+<Sustainability Review, connectedTo, Regulatory Compliance>
+<Sustainability Review, connectedTo, Species Reintroduction>
+<Sustainability Review, connectedTo, Waste Water Treatment>
+<Sustainability Review, educates, Soil Testing>
+<Waste Water Treatment, connectedTo, Species Reintroduction>
+<Water Sampling, connectedTo, Conservation Easement>
diff --git a/test/diagrams/graph_hard/diagrams_47.dot b/test/diagrams/graph_hard/diagrams_47.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0f78f793eae7a18f53e07efd119e086b6b2697eb
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_47.dot
@@ -0,0 +1,90 @@
+digraph {
+	rankdir=LR
+	N0 [label="Energy Audit" color="#FF9800" fillcolor="#FFE0B2" shape=preparation style=filled]
+	N1 [label="Carbon Footprint Calculation" color="#4CAF50" fillcolor="#C8E6C9" shape=inputoutput style=filled]
+	N2 [label="Conservation Easement" color="#BDBDBD" fillcolor="#F5F5F5" shape=inputoutput style=filled]
+	N3 [label="Ecological Footprint Analysis" color="#4CAF50" fillcolor="#C8E6C9" shape=predefinedprocess style=filled]
+	N4 [label="Waste Collection" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N5 [label="Policy Advocacy" color="#BDBDBD" fillcolor="#F5F5F5" shape=document style=filled]
+	N6 [label="Resource Tracking" color="#4CAF50" fillcolor="#C8E6C9" shape=document style=filled]
+	N7 [label="Water Sampling" color="#4CAF50" fillcolor="#C8E6C9" shape=multipledocuments style=filled]
+	N8 [label="Environmental Education Programs" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N9 [label="Citizen Science Initiative" color="#BDBDBD" fillcolor="#F5F5F5" shape=predefinedprocess style=filled]
+	N10 [label="Hazardous Material Handling" color="#4CAF50" fillcolor="#C8E6C9" shape=database style=filled]
+	N11 [label="Reforestation Planning" color="#FF9800" fillcolor="#FFE0B2" shape=vnode_shape style=filled]
+	N12 [label="Environmental Impact Assessment" color="#FF9800" fillcolor="#FFE0B2" shape=rectangle style=filled]
+	N13 [label="Recycling Process" color="#BDBDBD" fillcolor="#F5F5F5" shape=document style=filled]
+	N14 [label="Renewable Energy Project Development" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	S0 [label="" color="#BDBDBD" fillcolor="#F5F5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FF9800" fillcolor="#FFE0B2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#BDBDBD" fillcolor="#F5F5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FF9800" fillcolor="#FFE0B2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#BDBDBD" fillcolor="#F5F5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Coastal Erosion Control {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Coastal Erosion Control"
+		nest0_0 [label="Species Reintroduction" color="#FF9800" fillcolor="#FFE0B2" shape=database style=filled]
+		nest0_1 [label="Public Awareness Campaign" color="#BDBDBD" fillcolor="#F5F5F5" shape=document style=filled]
+		nest0_2 [label="Pollution Alert" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	}
+	subgraph cluster_Stormwater Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Stormwater Management"
+		nest1_0 [label="Sustainability Review" color="#BDBDBD" fillcolor="#F5F5F5" shape=rect style=filled]
+		nest1_1 [label="Sustainable Agriculture Practices" color="#4CAF50" fillcolor="#C8E6C9" shape=vnode_shape style=filled]
+		nest1_2 [label="Landfill Management" color="#FF9800" fillcolor="#FFE0B2" shape=parallelogram style=filled]
+		nest1_3 [label="Climate Modeling" color="#FF9800" fillcolor="#FFE0B2" shape=action style=filled]
+	}
+	N0 -> N1 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#BDBDBD" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#BDBDBD" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest0_0 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N10 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N13 -> nest1_0 [color="#4CAF50" penwidth=1.5 style=dashed label="funds" dir=forward]
+	nest1_3 -> N2 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N11 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N12 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	S2 -> N13 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N8 -> M0 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	M0 -> N10 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N12 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> M1 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	M1 -> N14 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	M2 -> N8 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_48.dot b/test/diagrams/graph_hard/diagrams_48.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2cf6b0f10693e9192a6970716bcd6c8f4f475618
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_48.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=LR
+	N0 [label="Ocean Cleanup" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N1 [label="Resource Tracking" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N2 [label="Stormwater Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=rectangle style=filled]
+	N3 [label="Environmental Education Programs" color="#FFF8A6" fillcolor="#FFFDE0" shape=preparation style=filled]
+	N4 [label="Ecosystem Restoration" color="#FFF8A6" fillcolor="#FFFDE0" shape=diamond style=filled]
+	N5 [label="Environmental Impact Assessment" color="#FFC107" fillcolor="#FFECB3" shape=inputoutput style=filled]
+	N6 [label="Coastal Erosion Control" color="#4285F4" fillcolor="#D0E0F8" shape=rectangle style=filled]
+	N7 [label="Environmental Research" color="#FFF8A6" fillcolor="#FFFDE0" shape=rect style=filled]
+	N8 [label="Groundwater Monitoring" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N9 [label="Emission Reporting" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N10 [label="Renewable Energy Project Development" color="#FFC107" fillcolor="#FFECB3" shape=database style=filled]
+	N11 [label="Soil Testing" color="#4285F4" fillcolor="#D0E0F8" shape=rectangle style=filled]
+	N12 [label="Public Awareness Campaign" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+	N13 [label="Climate Modeling" color="#FFF8A6" fillcolor="#FFFDE0" shape=diamond style=filled]
+	N14 [label="Air Quality Monitoring" color="#FFC107" fillcolor="#FFECB3" shape=inputoutput style=filled]
+	N15 [label="Regulatory Compliance" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N16 [label="Resource Recovery" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+	N17 [label="Wildlife Survey" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N18 [label="Renewable Energy Grid Integration" color="#FFC107" fillcolor="#FFECB3" shape=preparation style=filled]
+	N19 [label="Ecological Footprint Analysis" color="#FFF8A6" fillcolor="#FFFDE0" shape=vnode_shape style=filled]
+	N20 [label="Hazardous Material Handling" color="#FFF8A6" fillcolor="#FFFDE0" shape=vnode_shape style=filled]
+	S0 [label="" color="#4285F4" fillcolor="#D0E0F8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFC107" fillcolor="#FFECB3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#4285F4" fillcolor="#D0E0F8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Sustainability Review {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Sustainability Review"
+		nest0_0 [label="Landfill Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=document style=filled]
+		nest0_1 [label="Carbon Footprint Calculation" color="#4285F4" fillcolor="#D0E0F8" shape=database style=filled]
+		nest0_2 [label="Pollution Alert" color="#FFF8A6" fillcolor="#FFFDE0" shape=action style=filled]
+	}
+	subgraph cluster_Conservation Easement {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Conservation Easement"
+		nest1_0 [label="Noise Pollution Measurement" color="#FFC107" fillcolor="#FFECB3" shape=predefinedprocess style=filled]
+		nest1_1 [label="Policy Advocacy" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	}
+	N0 -> N1 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FFF8A6" penwidth=1.5 style=dashed label="protects" dir=forward]
+	N10 -> N11 [color="#FFC107" penwidth=1.5 style=solid label="enforces" dir=forward]
+	N11 -> N12 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid label="recycles" dir=forward]
+	N15 -> N16 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N17 -> N18 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N18 -> N19 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N19 -> N20 [color="#FFF8A6" penwidth=1.5 style=dashed label="reports" dir=forward]
+	nest0_0 -> nest0_1 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest0_0 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N6 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FFF8A6" penwidth=1.5 style=solid label="forecasts" dir=forward]
+	N7 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N15 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N17 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N19 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	S0 -> N20 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#4285F4" penwidth=1.5 style=dashed label="educates" dir=forward]
+	S1 -> N5 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N20 [color="#000000" penwidth=1.5 style=solid label="disposes" dir=forward]
+	N1 -> M0 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N12 -> M0 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	M0 -> N18 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N5 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_48.txt b/test/diagrams/graph_hard/diagrams_48.txt
new file mode 100644
index 0000000000000000000000000000000000000000..85d34a0a4150319bbad215ecefaa564451a18d94
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_48.txt
@@ -0,0 +1,36 @@
+<Air Quality Monitoring, recycles, Regulatory Compliance>
+<Carbon Footprint Calculation, connectedTo, Pollution Alert>
+<Climate Modeling, connectedTo, Air Quality Monitoring>
+<Coastal Erosion Control, connectedTo, Environmental Research>
+<Coastal Erosion Control, connectedTo, Landfill Management>
+<Ecological Footprint Analysis, reports, Hazardous Material Handling>
+<Ecosystem Restoration, connectedTo, Environmental Impact Assessment>
+<Emission Reporting, protects, Renewable Energy Project Development>
+<Environmental Education Programs, connectedTo, Ecosystem Restoration>
+<Environmental Impact Assessment, connectedTo, Coastal Erosion Control>
+<Environmental Research, connectedTo, Groundwater Monitoring>
+<Environmental Research, connectedTo, Noise Pollution Measurement>
+<Groundwater Monitoring, connectedTo, Emission Reporting>
+<Landfill Management, connectedTo, Carbon Footprint Calculation>
+<Noise Pollution Measurement, forecasts, Policy Advocacy>
+<Ocean Cleanup, connectedTo, Environmental Impact Assessment>
+<Ocean Cleanup, connectedTo, Resource Tracking>
+<Policy Advocacy, connectedTo, Regulatory Compliance>
+<Pollution Alert, connectedTo, Coastal Erosion Control>
+<Public Awareness Campaign, connectedTo, Climate Modeling>
+<Public Awareness Campaign, connectedTo, Renewable Energy Grid Integration>
+<Regulatory Compliance, connectedTo, Resource Recovery>
+<Renewable Energy Grid Integration, connectedTo, Ecological Footprint Analysis>
+<Renewable Energy Project Development, enforces, Soil Testing>
+<Resource Recovery, connectedTo, Wildlife Survey>
+<Resource Tracking, connectedTo, Renewable Energy Grid Integration>
+<Resource Tracking, connectedTo, Stormwater Management>
+<Soil Testing, connectedTo, Public Awareness Campaign>
+<Stormwater Management, connectedTo, Ecosystem Restoration>
+<Stormwater Management, connectedTo, Environmental Education Programs>
+<Stormwater Management, connectedTo, Environmental Impact Assessment>
+<Stormwater Management, disposes, Hazardous Material Handling>
+<Stormwater Management, educates, Air Quality Monitoring>
+<Wildlife Survey, connectedTo, Ecological Footprint Analysis>
+<Wildlife Survey, connectedTo, Hazardous Material Handling>
+<Wildlife Survey, connectedTo, Renewable Energy Grid Integration>
diff --git a/test/diagrams/graph_hard/diagrams_49.dot b/test/diagrams/graph_hard/diagrams_49.dot
new file mode 100644
index 0000000000000000000000000000000000000000..afa4d617b771048bb30ed7cdd6caa0047192eb21
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_49.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=RL
+	N0 [label="Code Enforcement" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N1 [label="Election Management" color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N2 [label="Infrastructure Planning" color="#03A9F4" fillcolor="#B3E5FC" shape=preparation style=filled]
+	N3 [label="National Defense" color="#673AB7" fillcolor="#D1C4E9" shape=multipledocuments style=filled]
+	N4 [label="Border Control" color="#03A9F4" fillcolor="#B3E5FC" shape=diamond style=filled]
+	N5 [label="Business Licensing" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N6 [label="Data Publishing" color="#AF56A6" fillcolor="#DDCEDD" shape=vnode_shape style=filled]
+	N7 [label="Vehicle Registration" color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N8 [label="Public Consultation" color="#AF56A6" fillcolor="#DDCEDD" shape=rect style=filled]
+	N9 [label="Emergency Preparedness" color="#03A9F4" fillcolor="#B3E5FC" shape=inputoutput style=filled]
+	N10 [label="Public Hearing" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N11 [label="Open Government Data Initiative" color="#AF56A6" fillcolor="#DDCEDD" shape=rect style=filled]
+	S0 [label="" color="#673AB7" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#673AB7" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#673AB7" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_ID Verification {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="ID Verification"
+		nest0_0 [label="Permit Application" color="#AF56A6" fillcolor="#DDCEDD" shape=inputoutput style=filled]
+		nest0_1 [label="Social Program Review" color="#673AB7" fillcolor="#D1C4E9" shape=diamond style=filled]
+		nest0_2 [label="Education Policy" color="#673AB7" fillcolor="#D1C4E9" shape=rect style=filled]
+		nest0_3 [label="Legal Advisory" color="#03A9F4" fillcolor="#B3E5FC" shape=parallelogram style=filled]
+	}
+	subgraph cluster_Transparency Audit {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Transparency Audit"
+		nest1_0 [label="Public Health Initiative" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+		nest1_1 [label="Tax Filing" color="#03A9F4" fillcolor="#B3E5FC" shape=rect style=filled]
+		nest1_2 [label="Whistleblower Protection" color="#673AB7" fillcolor="#D1C4E9" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid label="evaluates" dir=forward]
+	N2 -> N3 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#AF56A6" penwidth=1.5 style=solid label="coordinates" dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#673AB7" penwidth=1.5 style=solid label="regulates" dir=forward]
+	nest0_0 -> nest0_1 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#AF56A6" penwidth=1.5 style=dashed label="enforces" dir=forward]
+	nest0_2 -> nest0_3 [color="#03A9F4" penwidth=1.5 style=dashed label="enacts" dir=forward]
+	N1 -> nest0_0 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N6 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#AF56A6" penwidth=1.5 style=dashed label="publishes" dir=forward]
+	S0 -> N6 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N3 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S2 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N11 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	M2 -> N7 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_49.txt b/test/diagrams/graph_hard/diagrams_49.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1ac77af504c4d9ae16b8bd5c055a5ee43bb42a77
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_49.txt
@@ -0,0 +1,30 @@
+<Border Control, connectedTo, Business Licensing>
+<Business Licensing, connectedTo, Data Publishing>
+<Code Enforcement, connectedTo, Election Management>
+<Code Enforcement, connectedTo, National Defense>
+<Code Enforcement, connectedTo, Open Government Data Initiative>
+<Code Enforcement, connectedTo, Public Consultation>
+<Code Enforcement, connectedTo, Vehicle Registration>
+<Data Publishing, connectedTo, Vehicle Registration>
+<Education Policy, enacts, Legal Advisory>
+<Election Management, connectedTo, Data Publishing>
+<Election Management, connectedTo, Emergency Preparedness>
+<Election Management, connectedTo, Permit Application>
+<Election Management, connectedTo, Vehicle Registration>
+<Election Management, evaluates, Infrastructure Planning>
+<Election Management, publishes, Public Consultation>
+<Emergency Preparedness, connectedTo, Public Hearing>
+<Infrastructure Planning, connectedTo, National Defense>
+<Legal Advisory, connectedTo, Data Publishing>
+<National Defense, connectedTo, Border Control>
+<National Defense, connectedTo, Open Government Data Initiative>
+<National Defense, connectedTo, Vehicle Registration>
+<Permit Application, connectedTo, Social Program Review>
+<Public Consultation, coordinates, Emergency Preparedness>
+<Public Health Initiative, connectedTo, Tax Filing>
+<Public Hearing, connectedTo, Public Health Initiative>
+<Public Hearing, regulates, Open Government Data Initiative>
+<Social Program Review, enforces, Education Policy>
+<Tax Filing, connectedTo, Whistleblower Protection>
+<Vehicle Registration, connectedTo, Public Consultation>
+<Whistleblower Protection, connectedTo, Infrastructure Planning>
diff --git a/test/diagrams/graph_hard/diagrams_5.dot b/test/diagrams/graph_hard/diagrams_5.dot
new file mode 100644
index 0000000000000000000000000000000000000000..eb0140aca9e04bbfeff9aed19731bd7050b1ce2a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_5.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=LR
+	N0 [label="Patient Transfer" color="#DCE775" fillcolor="#F9FBE7" shape=document style=filled]
+	N1 [label="Treatment Plan" color="#A1887F" fillcolor="#EFEBE9" shape=rect style=filled]
+	N2 [label="Home Care Visit" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+	N3 [label="Prescription" color="#A1887F" fillcolor="#EFEBE9" shape=predefinedprocess style=filled]
+	N4 [label="Patient Intake" color="#D3EB9F" fillcolor="#F8FDD3" shape=diamond style=filled]
+	N5 [label="Allergy Test" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N6 [label="Case Review" color="#DCE775" fillcolor="#F9FBE7" shape=vnode_shape style=filled]
+	N7 [label="Medical History" color="#A1887F" fillcolor="#EFEBE9" shape=rect style=filled]
+	N8 [label="Physical Examination" color="#A1887F" fillcolor="#EFEBE9" shape=rect style=filled]
+	N9 [label="Telemedicine Consultation" color="#D3EB9F" fillcolor="#F8FDD3" shape=rect style=filled]
+	N10 [label="Triage" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+	N11 [label="Rehabilitation Therapy" color="#A1887F" fillcolor="#EFEBE9" shape=action style=filled]
+	N12 [label="Patient Education" color="#A1887F" fillcolor="#EFEBE9" shape=database style=filled]
+	S0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#DCE775" fillcolor="#F9FBE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#A1887F" fillcolor="#EFEBE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Symptom Monitoring {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Symptom Monitoring"
+		nest0_0 [label="Device Implantation" color="#D3EB9F" fillcolor="#F8FDD3" shape=diamond style=filled]
+		nest0_1 [label="Medical Record Keeping" color="#A1887F" fillcolor="#EFEBE9" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Surgery {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Surgery"
+		nest1_0 [label="Imaging Scan" color="#A1887F" fillcolor="#EFEBE9" shape=rectangle style=filled]
+		nest1_1 [label="Clinical Trial" color="#DCE775" fillcolor="#F9FBE7" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid label="triages" dir=forward]
+	N6 -> N7 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid label="coordinates" dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest0_0 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N3 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N0 -> S0 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	S0 -> N3 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> S1 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N3 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N9 -> S2 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N10 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_5.txt b/test/diagrams/graph_hard/diagrams_5.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c0231e417ad7bff2c021f7aa6410f1b3daf2f76d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_5.txt
@@ -0,0 +1,29 @@
+<Allergy Test, triages, Case Review>
+<Case Review, connectedTo, Device Implantation>
+<Case Review, connectedTo, Medical History>
+<Clinical Trial, connectedTo, Treatment Plan>
+<Clinical Trial, partOf, Clinical Trial>
+<Device Implantation, connectedTo, Medical Record Keeping>
+<Home Care Visit, connectedTo, Prescription>
+<Imaging Scan, connectedTo, Clinical Trial>
+<Imaging Scan, partOf, Imaging Scan>
+<Medical History, connectedTo, Physical Examination>
+<Medical History, connectedTo, Triage>
+<Medical Record Keeping, connectedTo, Prescription>
+<Patient Intake, connectedTo, Allergy Test>
+<Patient Transfer, connectedTo, Case Review>
+<Patient Transfer, connectedTo, Patient Education>
+<Patient Transfer, connectedTo, Prescription>
+<Patient Transfer, connectedTo, Treatment Plan>
+<Patient Transfer, connectedTo, Triage>
+<Physical Examination, connectedTo, Telemedicine Consultation>
+<Prescription, connectedTo, Imaging Scan>
+<Prescription, connectedTo, Patient Intake>
+<Rehabilitation Therapy, connectedTo, Patient Education>
+<Telemedicine Consultation, connectedTo, Patient Education>
+<Telemedicine Consultation, connectedTo, Rehabilitation Therapy>
+<Telemedicine Consultation, connectedTo, Triage>
+<Treatment Plan, connectedTo, Home Care Visit>
+<Treatment Plan, connectedTo, Prescription>
+<Treatment Plan, connectedTo, Triage>
+<Triage, coordinates, Rehabilitation Therapy>
diff --git a/test/diagrams/graph_hard/diagrams_50.dot b/test/diagrams/graph_hard/diagrams_50.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9b48d72c71e5a41a5b17f357ebfec8ece9c933c8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_50.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=LR
+	N0 [label="Social Program Review" color="#9FA9E1" fillcolor="#D6D9F0" shape=vnode_shape style=filled]
+	N1 [label="Passport Issuance" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+	N2 [label="Public Records Request" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N3 [label="Permit Application" color="#6FE1D5" fillcolor="#C9EFEC" shape=diamond style=filled]
+	N4 [label="Diplomatic Negotiation" color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+	N5 [label="Public Consultation" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N6 [label="Grant Distribution" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N7 [label="Public Works Maintenance" color="#80DDEA" fillcolor="#D3F7F9" shape=multipledocuments style=filled]
+	N8 [label="Vehicle Registration" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N9 [label="Budget Allocation" color="#6FE1D5" fillcolor="#C9EFEC" shape=predefinedprocess style=filled]
+	N10 [label="Election Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=rect style=filled]
+	N11 [label="Legal Advisory" color="#9FA9E1" fillcolor="#D6D9F0" shape=preparation style=filled]
+	N12 [label="Social Security Administration" color="#9FA9E1" fillcolor="#D6D9F0" shape=vnode_shape style=filled]
+	S0 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Infrastructure Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Infrastructure Planning"
+		nest0_0 [label="Public Sector Procurement" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+		nest0_1 [label="Transparency Audit" color="#9FA9E1" fillcolor="#D6D9F0" shape=preparation style=filled]
+		nest0_2 [label="Code Enforcement" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	}
+	subgraph cluster_National Defense {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="National Defense"
+		nest1_0 [label="Public Hearing" color="#6FE1D5" fillcolor="#C9EFEC" shape=rect style=filled]
+		nest1_1 [label="Veterans Affairs" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+		nest1_2 [label="Data Publishing" color="#6FE1D5" fillcolor="#C9EFEC" shape=rect style=filled]
+		nest1_3 [label="Legislation Review" color="#80DDEA" fillcolor="#D3F7F9" shape=database style=filled]
+	}
+	N0 -> N1 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#9FA9E1" penwidth=1.5 style=solid label="reviews" dir=forward]
+	N3 -> N4 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#6FE1D5" penwidth=1.5 style=solid label="issues" dir=forward]
+	N8 -> N9 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest0_0 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#6FE1D5" penwidth=1.5 style=solid label="responds" dir=forward]
+	nest1_1 -> nest1_2 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N2 -> nest1_0 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N4 [color="#9FA9E1" penwidth=1.5 style=solid label="regulates" dir=forward]
+	N6 -> S0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S1 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#80DDEA" penwidth=1.5 style=solid label="executes" dir=forward]
+	S1 -> N5 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N2 -> S2 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N4 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#80DDEA" penwidth=1.5 style=dashed label="enacts" dir=forward]
+	M0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#6FE1D5" penwidth=1.5 style=dashed label="partners" dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_50.txt b/test/diagrams/graph_hard/diagrams_50.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fc82c005eb613f09a9dd27c05e50686a9a2cd039
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_50.txt
@@ -0,0 +1,34 @@
+<Budget Allocation, connectedTo, Election Management>
+<Code Enforcement, connectedTo, Budget Allocation>
+<Data Publishing, connectedTo, Legislation Review>
+<Diplomatic Negotiation, connectedTo, Public Consultation>
+<Diplomatic Negotiation, connectedTo, Public Sector Procurement>
+<Diplomatic Negotiation, connectedTo, Public Works Maintenance>
+<Diplomatic Negotiation, partners, Grant Distribution>
+<Election Management, connectedTo, Legal Advisory>
+<Grant Distribution, connectedTo, Election Management>
+<Grant Distribution, connectedTo, Legal Advisory>
+<Grant Distribution, connectedTo, Public Works Maintenance>
+<Grant Distribution, connectedTo, Vehicle Registration>
+<Legal Advisory, connectedTo, Social Security Administration>
+<Legislation Review, regulates, Diplomatic Negotiation>
+<Passport Issuance, connectedTo, Public Consultation>
+<Passport Issuance, connectedTo, Public Records Request>
+<Passport Issuance, connectedTo, Public Works Maintenance>
+<Passport Issuance, executes, Election Management>
+<Permit Application, connectedTo, Diplomatic Negotiation>
+<Permit Application, enacts, Public Works Maintenance>
+<Public Consultation, connectedTo, Grant Distribution>
+<Public Hearing, responds, Veterans Affairs>
+<Public Records Request, connectedTo, Diplomatic Negotiation>
+<Public Records Request, connectedTo, Grant Distribution>
+<Public Records Request, connectedTo, Public Consultation>
+<Public Records Request, connectedTo, Public Hearing>
+<Public Records Request, reviews, Permit Application>
+<Public Sector Procurement, connectedTo, Transparency Audit>
+<Public Works Maintenance, issues, Vehicle Registration>
+<Social Program Review, connectedTo, Passport Issuance>
+<Social Program Review, connectedTo, Public Works Maintenance>
+<Transparency Audit, connectedTo, Code Enforcement>
+<Vehicle Registration, connectedTo, Budget Allocation>
+<Veterans Affairs, connectedTo, Data Publishing>
diff --git a/test/diagrams/graph_hard/diagrams_51.dot b/test/diagrams/graph_hard/diagrams_51.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9661e3d9f147f4cb7b6a438e4c50e2ffae8970d1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_51.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=RL
+	N0 [label="Citizen Feedback" color="#42A5F5" fillcolor="#F1F8FF" shape=multipledocuments style=filled]
+	N1 [label="Public Health Initiative" color="#388E3C" fillcolor="#F1F8E9" shape=rect style=filled]
+	N2 [label="Passport Issuance" color="#BCB88A" fillcolor="#F5F5DC" shape=preparation style=filled]
+	N3 [label="Census Collection" color="#42A5F5" fillcolor="#F1F8FF" shape=inputoutput style=filled]
+	N4 [label="Grant Distribution" color="#BCB88A" fillcolor="#F5F5DC" shape=vnode_shape style=filled]
+	N5 [label="Budget Allocation" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+	N6 [label="Business Licensing" color="#42A5F5" fillcolor="#F1F8FF" shape=action style=filled]
+	N7 [label="Social Program Review" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N8 [label="Legal Advisory" color="#388E3C" fillcolor="#F1F8E9" shape=vnode_shape style=filled]
+	N9 [label="Public Hearing" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+	N10 [label="Transparency Audit" color="#42A5F5" fillcolor="#F1F8FF" shape=parallelogram style=filled]
+	N11 [label="Open Government Data Initiative" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	S1 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#42A5F5" fillcolor="#F1F8FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Permit Application {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Permit Application"
+		nest0_0 [label="Border Control" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+		nest0_1 [label="Public Works Maintenance" color="#42A5F5" fillcolor="#F1F8FF" shape=inputoutput style=filled]
+		nest0_2 [label="Emergency Preparedness" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+		nest0_3 [label="International Relations" color="#42A5F5" fillcolor="#F1F8FF" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Urban Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Urban Planning"
+		nest1_0 [label="Public Records Request" color="#42A5F5" fillcolor="#F1F8FF" shape=preparation style=filled]
+		nest1_1 [label="Whistleblower Protection" color="#388E3C" fillcolor="#F1F8E9" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#42A5F5" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#388E3C" penwidth=1.5 style=solid label="mediates" dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest0_0 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N9 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#42A5F5" penwidth=1.5 style=solid label="taxes" dir=forward]
+	nest1_1 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> S1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S2 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#42A5F5" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N6 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_51.txt b/test/diagrams/graph_hard/diagrams_51.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ca38b24a488eabac3326d3bced6659b230cff6dc
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_51.txt
@@ -0,0 +1,27 @@
+<Border Control, connectedTo, Public Works Maintenance>
+<Budget Allocation, connectedTo, Business Licensing>
+<Business Licensing, connectedTo, Social Program Review>
+<Census Collection, connectedTo, Business Licensing>
+<Census Collection, connectedTo, Grant Distribution>
+<Census Collection, connectedTo, Legal Advisory>
+<Census Collection, connectedTo, Open Government Data Initiative>
+<Census Collection, taxes, Public Records Request>
+<Citizen Feedback, connectedTo, Business Licensing>
+<Citizen Feedback, connectedTo, Public Health Initiative>
+<Emergency Preparedness, connectedTo, International Relations>
+<Grant Distribution, connectedTo, Budget Allocation>
+<Grant Distribution, connectedTo, Business Licensing>
+<International Relations, connectedTo, Public Hearing>
+<Legal Advisory, connectedTo, Public Hearing>
+<Passport Issuance, connectedTo, Census Collection>
+<Public Health Initiative, connectedTo, Passport Issuance>
+<Public Hearing, connectedTo, Border Control>
+<Public Hearing, mediates, Transparency Audit>
+<Public Records Request, connectedTo, Whistleblower Protection>
+<Public Works Maintenance, connectedTo, Emergency Preparedness>
+<Social Program Review, connectedTo, Legal Advisory>
+<Social Program Review, connectedTo, Open Government Data Initiative>
+<Social Program Review, connectedTo, Public Hearing>
+<Social Program Review, connectedTo, Transparency Audit>
+<Transparency Audit, connectedTo, Open Government Data Initiative>
+<Whistleblower Protection, connectedTo, Grant Distribution>
diff --git a/test/diagrams/graph_hard/diagrams_52.dot b/test/diagrams/graph_hard/diagrams_52.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b3385775807954f0fe79ea88b032fb45ef438b9e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_52.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=TB
+	N0 [label="Vendor Managed Inventory" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N1 [label="Point of Sale System Update" color="#D2D2D2" fillcolor="#F0F0F0" shape=multipledocuments style=filled]
+	N2 [label="Sales Forecasting" color="#66BB6A" fillcolor="#E8F5E9" shape=document style=filled]
+	N3 [label="Product Demonstration" color="#F7BEE0" fillcolor="#FAEBF3" shape=diamond style=filled]
+	N4 [label="Inventory Check" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N5 [label="Gift Wrapping" color="#F7BEE0" fillcolor="#FAEBF3" shape=action style=filled]
+	N6 [label="Store Layout Design" color="#66BB6A" fillcolor="#E8F5E9" shape=rectangle style=filled]
+	N7 [label="Barcode Scanning" color="#F7BEE0" fillcolor="#FAEBF3" shape=multipledocuments style=filled]
+	N8 [label="Supplier Coordination" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N9 [label="Staff Training" color="#F7BEE0" fillcolor="#FAEBF3" shape=preparation style=filled]
+	N10 [label="Discount Application" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N11 [label="Price Tagging" color="#F7BEE0" fillcolor="#FAEBF3" shape=vnode_shape style=filled]
+	N12 [label="Shelf Restocking" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N13 [label="Product Listing" color="#F7BEE0" fillcolor="#FAEBF3" shape=predefinedprocess style=filled]
+	N14 [label="Order Fulfillment" color="#F7BEE0" fillcolor="#FAEBF3" shape=inputoutput style=filled]
+	N15 [label="Stock Replenishment" color="#D2D2D2" fillcolor="#F0F0F0" shape=rect style=filled]
+	N16 [label="Supply Chain Optimization" color="#66BB6A" fillcolor="#E8F5E9" shape=database style=filled]
+	N17 [label="Curbside Delivery" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N18 [label="Fitting Room Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=document style=filled]
+	N19 [label="Visual Merchandising" color="#F7BEE0" fillcolor="#FAEBF3" shape=rectangle style=filled]
+	N20 [label="Customer Checkout" color="#D2D2D2" fillcolor="#F0F0F0" shape=action style=filled]
+	S0 [label="" color="#66BB6A" fillcolor="#E8F5E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#D2D2D2" fillcolor="#F0F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Promotion Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Promotion Planning"
+		nest0_0 [label="Self_Checkout Assistance" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+		nest0_1 [label="Daily Report Generation" color="#66BB6A" fillcolor="#E8F5E9" shape=action style=filled]
+	}
+	subgraph cluster_Loss Prevention {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Loss Prevention"
+		nest1_0 [label="Warehouse Picking" color="#D2D2D2" fillcolor="#F0F0F0" shape=multipledocuments style=filled]
+		nest1_1 [label="Loyalty Program Update" color="#F7BEE0" fillcolor="#FAEBF3" shape=parallelogram style=filled]
+		nest1_2 [label="Receipt Issuing" color="#66BB6A" fillcolor="#E8F5E9" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#66BB6A" penwidth=1.5 style=dashed label="packs" dir=forward]
+	N4 -> N5 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#F7BEE0" penwidth=1.5 style=solid label="restocks" dir=forward]
+	N11 -> N12 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#66BB6A" penwidth=1.5 style=dashed label="receives" dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#D2D2D2" penwidth=1.5 style=solid label="displays" dir=forward]
+	N17 -> N18 [color="#F7BEE0" penwidth=1.5 style=solid label="personalizes" dir=forward]
+	N18 -> N19 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N19 -> N20 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N16 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N7 [color="#F7BEE0" penwidth=1.5 style=solid label="audits" dir=forward]
+	nest1_0 -> nest1_1 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N18 -> nest1_0 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N20 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N16 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N20 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N14 -> S1 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N18 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#F7BEE0" penwidth=1.5 style=solid label="complies" dir=forward]
+	M1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_52.txt b/test/diagrams/graph_hard/diagrams_52.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3503d41655d5ad70f8771f499558b6d866f7ec0b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_52.txt
@@ -0,0 +1,34 @@
+<Barcode Scanning, connectedTo, Supplier Coordination>
+<Curbside Delivery, personalizes, Fitting Room Management>
+<Daily Report Generation, audits, Barcode Scanning>
+<Discount Application, restocks, Price Tagging>
+<Fitting Room Management, connectedTo, Visual Merchandising>
+<Fitting Room Management, connectedTo, Warehouse Picking>
+<Gift Wrapping, connectedTo, Barcode Scanning>
+<Gift Wrapping, connectedTo, Store Layout Design>
+<Inventory Check, connectedTo, Gift Wrapping>
+<Loyalty Program Update, connectedTo, Receipt Issuing>
+<Order Fulfillment, connectedTo, Fitting Room Management>
+<Order Fulfillment, connectedTo, Stock Replenishment>
+<Order Fulfillment, connectedTo, Supply Chain Optimization>
+<Point of Sale System Update, connectedTo, Sales Forecasting>
+<Price Tagging, connectedTo, Shelf Restocking>
+<Product Demonstration, packs, Inventory Check>
+<Product Listing, connectedTo, Order Fulfillment>
+<Receipt Issuing, connectedTo, Customer Checkout>
+<Sales Forecasting, connectedTo, Barcode Scanning>
+<Sales Forecasting, connectedTo, Customer Checkout>
+<Sales Forecasting, connectedTo, Product Demonstration>
+<Sales Forecasting, connectedTo, Supply Chain Optimization>
+<Self_Checkout Assistance, connectedTo, Daily Report Generation>
+<Shelf Restocking, receives, Product Listing>
+<Staff Training, connectedTo, Discount Application>
+<Stock Replenishment, connectedTo, Supply Chain Optimization>
+<Store Layout Design, connectedTo, Barcode Scanning>
+<Supplier Coordination, connectedTo, Staff Training>
+<Supply Chain Optimization, connectedTo, Self_Checkout Assistance>
+<Supply Chain Optimization, displays, Curbside Delivery>
+<Vendor Managed Inventory, complies, Barcode Scanning>
+<Vendor Managed Inventory, connectedTo, Point of Sale System Update>
+<Visual Merchandising, connectedTo, Customer Checkout>
+<Warehouse Picking, connectedTo, Loyalty Program Update>
diff --git a/test/diagrams/graph_hard/diagrams_53.txt b/test/diagrams/graph_hard/diagrams_53.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ad15a93db6fe0a489e4aed84619f1e9b34117cee
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_53.txt
@@ -0,0 +1,30 @@
+<Barcode Scanning, connectedTo, Customer Checkout>
+<Barcode Scanning, connectedTo, Customer Loyalty Analytics>
+<Barcode Scanning, connectedTo, Vendor Managed Inventory>
+<Barcode Scanning, promotes, Payment Processing>
+<Complaint Management, connectedTo, E_commerce Platform Integration>
+<Complaint Management, connectedTo, Loss Prevention>
+<Complaint Management, connectedTo, Online Order Pickup>
+<Complaint Management, connectedTo, Payment Processing>
+<Curbside Delivery, connectedTo, E_commerce Platform Integration>
+<Customer Loyalty Analytics, personalizes, Customer Checkout>
+<Customer Survey, connectedTo, Point of Sale System Update>
+<E_commerce Platform Integration, purchases, Loss Prevention>
+<Loss Prevention, connectedTo, Customer Loyalty Analytics>
+<Loss Prevention, connectedTo, Shelf Restocking>
+<Loss Prevention, connectedTo, Staff Training>
+<Loss Prevention, connectedTo, Store Layout Design>
+<Online Order Pickup, connectedTo, E_commerce Platform Integration>
+<Online Order Pickup, connectedTo, Order Fulfillment>
+<Order Fulfillment, connectedTo, Supplier Coordination>
+<Payment Processing, connectedTo, Customer Loyalty Analytics>
+<Point of Sale System Update, connectedTo, Customer Checkout>
+<Receipt Issuing, connectedTo, Return Handling>
+<Return Handling, connectedTo, Supply Chain Optimization>
+<Shelf Restocking, connectedTo, Barcode Scanning>
+<Staff Training, connectedTo, Customer Survey>
+<Store Layout Design, connectedTo, Supply Chain Optimization>
+<Supplier Coordination, connectedTo, Curbside Delivery>
+<Supply Chain Optimization, connectedTo, Shelf Restocking>
+<Vendor Managed Inventory, connectedTo, Receipt Issuing>
+<Visual Merchandising, connectedTo, Complaint Management>
diff --git a/test/diagrams/graph_hard/diagrams_54.dot b/test/diagrams/graph_hard/diagrams_54.dot
new file mode 100644
index 0000000000000000000000000000000000000000..181c7262dc192b7021896ef08a22789844712cac
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_54.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=LR
+	N0 [label="Daily Report Generation" color="#DCE775" fillcolor="#F9FBE7" shape=inputoutput style=filled]
+	N1 [label="E_commerce Platform Integration" color="#EAEFA5" fillcolor="#FDFCEB" shape=database style=filled]
+	N2 [label="Inventory Check" color="#A188D0" fillcolor="#DACBE3" shape=multipledocuments style=filled]
+	N3 [label="Staff Training" color="#EAEFA5" fillcolor="#FDFCEB" shape=parallelogram style=filled]
+	N4 [label="Gift Wrapping" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N5 [label="Sales Forecasting" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N6 [label="Supply Chain Optimization" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N7 [label="Online Order Pickup" color="#DCE775" fillcolor="#F9FBE7" shape=rect style=filled]
+	N8 [label="Supplier Coordination" color="#EAEFA5" fillcolor="#FDFCEB" shape=multipledocuments style=filled]
+	N9 [label="Receipt Issuing" color="#A188D0" fillcolor="#DACBE3" shape=rectangle style=filled]
+	N10 [label="Seasonal Sales Planning" color="#EAEFA5" fillcolor="#FDFCEB" shape=inputoutput style=filled]
+	N11 [label="Loyalty Program Update" color="#EAEFA5" fillcolor="#FDFCEB" shape=inputoutput style=filled]
+	S0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Point of Sale System Update {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Point of Sale System Update"
+		nest0_0 [label="Self_Checkout Assistance" color="#A188D0" fillcolor="#DACBE3" shape=inputoutput style=filled]
+		nest0_1 [label="Visual Merchandising" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+		nest0_2 [label="Warehouse Picking" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+		nest0_3 [label="Customer Survey" color="#EAEFA5" fillcolor="#FDFCEB" shape=database style=filled]
+	}
+	subgraph cluster_Discount Application {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Discount Application"
+		nest1_0 [label="Product Listing" color="#A188D0" fillcolor="#DACBE3" shape=predefinedprocess style=filled]
+		nest1_1 [label="Order Fulfillment" color="#A188D0" fillcolor="#DACBE3" shape=inputoutput style=filled]
+		nest1_2 [label="Curbside Delivery" color="#DCE775" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#DCE775" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#A188D0" penwidth=1.5 style=dashed label="packs" dir=forward]
+	nest0_1 -> nest0_2 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N3 [color="#DCE775" penwidth=1.5 style=dashed label="discounts" dir=forward]
+	nest1_0 -> nest1_1 [color="#EAEFA5" penwidth=1.5 style=dashed label="personalizes" dir=forward]
+	nest1_1 -> nest1_2 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N7 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#DCE775" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N5 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_54.txt b/test/diagrams/graph_hard/diagrams_54.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8b749c553a668bf305454a87769c3ea7c4e697c0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_54.txt
@@ -0,0 +1,28 @@
+<Curbside Delivery, connectedTo, Online Order Pickup>
+<Customer Survey, discounts, Staff Training>
+<Daily Report Generation, connectedTo, E_commerce Platform Integration>
+<Daily Report Generation, connectedTo, Sales Forecasting>
+<Daily Report Generation, connectedTo, Staff Training>
+<E_commerce Platform Integration, connectedTo, Inventory Check>
+<E_commerce Platform Integration, connectedTo, Staff Training>
+<Gift Wrapping, connectedTo, Sales Forecasting>
+<Inventory Check, connectedTo, Sales Forecasting>
+<Inventory Check, connectedTo, Staff Training>
+<Online Order Pickup, connectedTo, Loyalty Program Update>
+<Online Order Pickup, connectedTo, Receipt Issuing>
+<Online Order Pickup, connectedTo, Seasonal Sales Planning>
+<Online Order Pickup, connectedTo, Supplier Coordination>
+<Order Fulfillment, connectedTo, Curbside Delivery>
+<Product Listing, personalizes, Order Fulfillment>
+<Receipt Issuing, connectedTo, Seasonal Sales Planning>
+<Sales Forecasting, connectedTo, Supply Chain Optimization>
+<Seasonal Sales Planning, connectedTo, Loyalty Program Update>
+<Self_Checkout Assistance, packs, Visual Merchandising>
+<Staff Training, connectedTo, Gift Wrapping>
+<Staff Training, connectedTo, Product Listing>
+<Staff Training, connectedTo, Sales Forecasting>
+<Supplier Coordination, connectedTo, Receipt Issuing>
+<Supplier Coordination, connectedTo, Self_Checkout Assistance>
+<Supply Chain Optimization, connectedTo, Online Order Pickup>
+<Visual Merchandising, connectedTo, Warehouse Picking>
+<Warehouse Picking, connectedTo, Customer Survey>
diff --git a/test/diagrams/graph_hard/diagrams_55.dot b/test/diagrams/graph_hard/diagrams_55.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4c2a3d907ca5af568c8ba90fd62cb9ce9d2a1eb9
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_55.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=LR
+	N0 [label="After_sales Service" color="#FFF176" fillcolor="#FFFDE7" shape=predefinedprocess style=filled]
+	N1 [label="Part Manufacturing" color="#FFF176" fillcolor="#FFFDE7" shape=preparation style=filled]
+	N2 [label="Vehicle Connectivity" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+	N3 [label="Maintenance Scheduling" color="#73C6BC" fillcolor="#D0EFEE" shape=rect style=filled]
+	N4 [label="Software Calibration" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N5 [label="Assembly Line Setup" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N6 [label="Electric Vehicle Battery Production" color="#73C6BC" fillcolor="#D0EFEE" shape=document style=filled]
+	N7 [label="Diagnostic Trouble Code Reading" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+	N8 [label="Component Testing" color="#FFF176" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+	N9 [label="Dealership Sales" color="#73C6BC" fillcolor="#D0EFEE" shape=rect style=filled]
+	N10 [label="Safety Inspection" color="#B8C0F5" fillcolor="#ECF0FD" shape=multipledocuments style=filled]
+	N11 [label="Parts Distribution" color="#B8C0F5" fillcolor="#ECF0FD" shape=vnode_shape style=filled]
+	N12 [label="Infotainment System Integration" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N13 [label="Engine Installation" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N14 [label="Body Shop Repair" color="#73C6BC" fillcolor="#D0EFEE" shape=inputoutput style=filled]
+	N15 [label="Brake System Check" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N16 [label="Vehicle Registration" color="#73C6BC" fillcolor="#D0EFEE" shape=document style=filled]
+	S0 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Paint Application {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Paint Application"
+		nest0_0 [label="Supplier Selection" color="#73C6BC" fillcolor="#D0EFEE" shape=database style=filled]
+		nest0_1 [label="Warranty Activation" color="#FFF176" fillcolor="#FFFDE7" shape=database style=filled]
+	}
+	subgraph cluster_Crash Simulation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Crash Simulation"
+		nest1_0 [label="Fluid Level Check" color="#73C6BC" fillcolor="#D0EFEE" shape=document style=filled]
+		nest1_1 [label="Fuel Efficiency Check" color="#FFF176" fillcolor="#FFFDE7" shape=rect style=filled]
+		nest1_2 [label="Customer Test Drive" color="#FFF176" fillcolor="#FFFDE7" shape=preparation style=filled]
+		nest1_3 [label="Oil Change" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	}
+	N0 -> N1 [color="#73C6BC" penwidth=1.5 style=solid label="connects" dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#B8C0F5" penwidth=1.5 style=dashed label="automates" dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest0_0 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N13 [color="#73C6BC" penwidth=1.5 style=solid label="upgrades" dir=forward]
+	nest1_0 -> nest1_1 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#B8C0F5" penwidth=1.5 style=solid label="produces" dir=forward]
+	N15 -> nest1_0 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N5 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N12 -> S0 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#FFF176" penwidth=1.5 style=solid label="simulates" dir=forward]
+	S0 -> N15 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N12 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#FFF176" penwidth=1.5 style=dashed label="markets" dir=forward]
+	N2 -> S2 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N16 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N4 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	M1 -> N6 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N6 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_55.txt b/test/diagrams/graph_hard/diagrams_55.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6807fa92d664045cbffe3ee926fd1ec1402a73d6
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_55.txt
@@ -0,0 +1,34 @@
+<After_sales Service, connectedTo, Electric Vehicle Battery Production>
+<After_sales Service, connects, Part Manufacturing>
+<Assembly Line Setup, connectedTo, Electric Vehicle Battery Production>
+<Body Shop Repair, connectedTo, Brake System Check>
+<Brake System Check, connectedTo, Fluid Level Check>
+<Brake System Check, connectedTo, Vehicle Registration>
+<Component Testing, connectedTo, Dealership Sales>
+<Customer Test Drive, produces, Oil Change>
+<Dealership Sales, connectedTo, Safety Inspection>
+<Diagnostic Trouble Code Reading, connectedTo, Component Testing>
+<Electric Vehicle Battery Production, connectedTo, Diagnostic Trouble Code Reading>
+<Engine Installation, connectedTo, Body Shop Repair>
+<Engine Installation, connectedTo, Supplier Selection>
+<Fluid Level Check, connectedTo, Fuel Efficiency Check>
+<Fuel Efficiency Check, connectedTo, Customer Test Drive>
+<Infotainment System Integration, connectedTo, Brake System Check>
+<Infotainment System Integration, connectedTo, Engine Installation>
+<Infotainment System Integration, connectedTo, Vehicle Registration>
+<Infotainment System Integration, markets, Brake System Check>
+<Infotainment System Integration, simulates, Body Shop Repair>
+<Maintenance Scheduling, connectedTo, Software Calibration>
+<Oil Change, connectedTo, Assembly Line Setup>
+<Part Manufacturing, connectedTo, Vehicle Connectivity>
+<Parts Distribution, connectedTo, Infotainment System Integration>
+<Safety Inspection, connectedTo, Parts Distribution>
+<Software Calibration, automates, Assembly Line Setup>
+<Software Calibration, connectedTo, Electric Vehicle Battery Production>
+<Supplier Selection, connectedTo, Warranty Activation>
+<Vehicle Connectivity, connectedTo, Diagnostic Trouble Code Reading>
+<Vehicle Connectivity, connectedTo, Electric Vehicle Battery Production>
+<Vehicle Connectivity, connectedTo, Maintenance Scheduling>
+<Vehicle Connectivity, connectedTo, Software Calibration>
+<Vehicle Connectivity, connectedTo, Vehicle Registration>
+<Warranty Activation, upgrades, Engine Installation>
diff --git a/test/diagrams/graph_hard/diagrams_56.dot b/test/diagrams/graph_hard/diagrams_56.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0c814eab3d56528d026e135598574d392c0116bf
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_56.dot
@@ -0,0 +1,91 @@
+digraph {
+	rankdir=LR
+	N0 [label="Vehicle Registration" color="#64B5F6" fillcolor="#E3F2FD" shape=rect style=filled]
+	N1 [label="Component Testing" color="#7986CB" fillcolor="#E8EAF6" shape=predefinedprocess style=filled]
+	N2 [label="Crash Simulation" color="#7986CB" fillcolor="#E8EAF6" shape=rectangle style=filled]
+	N3 [label="Vehicle Financing" color="#64B5F6" fillcolor="#E3F2FD" shape=database style=filled]
+	N4 [label="Software Calibration" color="#BA68C8" fillcolor="#F3E5F5" shape=predefinedprocess style=filled]
+	N5 [label="Parts Distribution" color="#64B5F6" fillcolor="#E3F2FD" shape=predefinedprocess style=filled]
+	N6 [label="Engine Installation" color="#64B5F6" fillcolor="#E3F2FD" shape=document style=filled]
+	N7 [label="Research and Development" color="#BA68C8" fillcolor="#F3E5F5" shape=action style=filled]
+	N8 [label="Safety Inspection" color="#BA68C8" fillcolor="#F3E5F5" shape=rectangle style=filled]
+	N9 [label="Customer Relationship Management" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+	N10 [label="Fuel Efficiency Check" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N11 [label="Emission Testing" color="#64B5F6" fillcolor="#E3F2FD" shape=database style=filled]
+	N12 [label="Assembly Line Setup" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N13 [label="Supplier Selection" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N14 [label="Customer Test Drive" color="#7986CB" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	S0 [label="" color="#7986CB" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#7986CB" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#7986CB" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Inventory Tracking {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Inventory Tracking"
+		nest0_0 [label="Infotainment System Integration" color="#64B5F6" fillcolor="#E3F2FD" shape=preparation style=filled]
+		nest0_1 [label="Autonomous Driving Software Development" color="#BA68C8" fillcolor="#F3E5F5" shape=action style=filled]
+		nest0_2 [label="Road Testing" color="#7986CB" fillcolor="#E8EAF6" shape=multipledocuments style=filled]
+		nest0_3 [label="Paint Application" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+	}
+	subgraph cluster_Vehicle Connectivity {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Vehicle Connectivity"
+		nest1_0 [label="Vehicle Design" color="#64B5F6" fillcolor="#E3F2FD" shape=document style=filled]
+		nest1_1 [label="Oil Change" color="#7986CB" fillcolor="#E8EAF6" shape=document style=filled]
+		nest1_2 [label="Global Supply Chain Management" color="#BA68C8" fillcolor="#F3E5F5" shape=multipledocuments style=filled]
+		nest1_3 [label="Brake System Check" color="#7986CB" fillcolor="#E8EAF6" shape=database style=filled]
+	}
+	N0 -> N1 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#64B5F6" penwidth=1.5 style=dashed label="tests" dir=forward]
+	N5 -> N6 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest0_0 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N9 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#7986CB" penwidth=1.5 style=solid label="audits" dir=forward]
+	N6 -> nest1_0 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N9 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N14 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N10 -> S1 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N7 -> S2 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N13 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	S2 -> N11 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N8 -> M0 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M0 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N10 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M1 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N13 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N5 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_56.txt b/test/diagrams/graph_hard/diagrams_56.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d73026ed8af581f3ad5133bc64ae219fc32ce779
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_56.txt
@@ -0,0 +1,40 @@
+<Assembly Line Setup, connectedTo, Supplier Selection>
+<Autonomous Driving Software Development, connectedTo, Road Testing>
+<Brake System Check, connectedTo, Customer Relationship Management>
+<Component Testing, connectedTo, Crash Simulation>
+<Component Testing, connectedTo, Infotainment System Integration>
+<Crash Simulation, connectedTo, Parts Distribution>
+<Crash Simulation, connectedTo, Vehicle Financing>
+<Customer Relationship Management, connectedTo, Fuel Efficiency Check>
+<Customer Relationship Management, connectedTo, Supplier Selection>
+<Emission Testing, connectedTo, Assembly Line Setup>
+<Engine Installation, connectedTo, Research and Development>
+<Engine Installation, connectedTo, Vehicle Design>
+<Fuel Efficiency Check, connectedTo, Assembly Line Setup>
+<Fuel Efficiency Check, connectedTo, Customer Test Drive>
+<Fuel Efficiency Check, connectedTo, Emission Testing>
+<Fuel Efficiency Check, connectedTo, Supplier Selection>
+<Global Supply Chain Management, audits, Brake System Check>
+<Infotainment System Integration, connectedTo, Autonomous Driving Software Development>
+<Oil Change, connectedTo, Global Supply Chain Management>
+<Paint Application, connectedTo, Customer Relationship Management>
+<Parts Distribution, connectedTo, Engine Installation>
+<Research and Development, connectedTo, Assembly Line Setup>
+<Research and Development, connectedTo, Customer Relationship Management>
+<Research and Development, connectedTo, Emission Testing>
+<Research and Development, connectedTo, Safety Inspection>
+<Research and Development, connectedTo, Supplier Selection>
+<Road Testing, connectedTo, Paint Application>
+<Safety Inspection, connectedTo, Customer Relationship Management>
+<Safety Inspection, connectedTo, Supplier Selection>
+<Software Calibration, connectedTo, Customer Test Drive>
+<Software Calibration, connectedTo, Emission Testing>
+<Software Calibration, connectedTo, Engine Installation>
+<Software Calibration, connectedTo, Research and Development>
+<Software Calibration, tests, Parts Distribution>
+<Supplier Selection, connectedTo, Customer Test Drive>
+<Vehicle Design, connectedTo, Oil Change>
+<Vehicle Financing, connectedTo, Software Calibration>
+<Vehicle Registration, connectedTo, Component Testing>
+<Vehicle Registration, connectedTo, Parts Distribution>
+<Vehicle Registration, connectedTo, Supplier Selection>
diff --git a/test/diagrams/graph_hard/diagrams_57.dot b/test/diagrams/graph_hard/diagrams_57.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e29eff9745a17bd49e38b92e2a5a41249333cc48
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_57.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=LR
+	N0 [label="Emission Testing" color="#A188DB" fillcolor="#DED7F0" shape=predefinedprocess style=filled]
+	N1 [label="Assembly Line Setup" color="#A188DB" fillcolor="#DED7F0" shape=inputoutput style=filled]
+	N2 [label="Tire Rotation" color="#FFC085" fillcolor="#FFDAB9" shape=hexagon style=filled]
+	N3 [label="Recall Management" color="#FFC085" fillcolor="#FFDAB9" shape=database style=filled]
+	N4 [label="Parts Distribution" color="#A188DB" fillcolor="#DED7F0" shape=parallelogram style=filled]
+	N5 [label="Engine Installation" color="#A188DB" fillcolor="#DED7F0" shape=rect style=filled]
+	N6 [label="Supplier Selection" color="#FFC085" fillcolor="#FFDAB9" shape=multipledocuments style=filled]
+	N7 [label="Safety Inspection" color="#FFC085" fillcolor="#FFDAB9" shape=vnode_shape style=filled]
+	N8 [label="Paint Application" color="#A188DB" fillcolor="#DED7F0" shape=predefinedprocess style=filled]
+	N9 [label="Body Shop Repair" color="#FFC085" fillcolor="#FFDAB9" shape=database style=filled]
+	N10 [label="Customer Test Drive" color="#FF9800" fillcolor="#FFE0B2" shape=document style=filled]
+	N11 [label="After_sales Service" color="#FF9800" fillcolor="#FFE0B2" shape=predefinedprocess style=filled]
+	N12 [label="Component Testing" color="#FFC085" fillcolor="#FFDAB9" shape=rectangle style=filled]
+	N13 [label="Recycling of Vehicle Components" color="#A188DB" fillcolor="#DED7F0" shape=document style=filled]
+	N14 [label="Vehicle Design" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	N15 [label="Warranty Activation" color="#A188DB" fillcolor="#DED7F0" shape=vnode_shape style=filled]
+	N16 [label="Global Supply Chain Management" color="#FFC085" fillcolor="#FFDAB9" shape=rectangle style=filled]
+	N17 [label="Vehicle Connectivity" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N18 [label="Inventory Tracking" color="#FFC085" fillcolor="#FFDAB9" shape=action style=filled]
+	S0 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FF9800" fillcolor="#FFE0B2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Robotics in Production {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Robotics in Production"
+		nest0_0 [label="Quality Assurance" color="#FF9800" fillcolor="#FFE0B2" shape=inputoutput style=filled]
+		nest0_1 [label="Dealership Sales" color="#A188DB" fillcolor="#DED7F0" shape=document style=filled]
+	}
+	subgraph cluster_Diagnostic Trouble Code Reading {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Diagnostic Trouble Code Reading"
+		nest1_0 [label="Road Testing" color="#FF9800" fillcolor="#FFE0B2" shape=rectangle style=filled]
+		nest1_1 [label="Autonomous Driving Software Development" color="#FFC085" fillcolor="#FFDAB9" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FF9800" penwidth=1.5 style=dashed label="audits" dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFC085" penwidth=1.5 style=dashed label="manufactures" dir=forward]
+	N5 -> N6 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	N17 -> N18 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest0_0 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N18 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N17 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S0 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N18 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	S0 -> N16 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S1 [color="#FF9800" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#FF9800" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N4 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N10 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	M2 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_58.dot b/test/diagrams/graph_hard/diagrams_58.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d05cf668dae1ca22f30e32f33ed3bfd6227afbce
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_58.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=TB
+	N0 [label="Avionics Installation" color="#6FE1D5" fillcolor="#C9EFEC" shape=multipledocuments style=filled]
+	N1 [label="Spacecraft Telemetry Analysis" color="#673AB7" fillcolor="#D1C4E9" shape=predefinedprocess style=filled]
+	N2 [label="Payload Integration" color="#BA68C8" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N3 [label="System Reboot" color="#6FE1D5" fillcolor="#C9EFEC" shape=action style=filled]
+	N4 [label="Aircraft Manufacturing" color="#BA68C8" fillcolor="#F3E5F5" shape=inputoutput style=filled]
+	N5 [label="Runway Inspection" color="#6FE1D5" fillcolor="#C9EFEC" shape=multipledocuments style=filled]
+	N6 [label="Satellite Configuration" color="#BA68C8" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N7 [label="Re_entry Vehicle Design" color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	S0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#673AB7" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#673AB7" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_New Material Development {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="New Material Development"
+		nest0_0 [label="Fueling Procedure" color="#673AB7" fillcolor="#D1C4E9" shape=multipledocuments style=filled]
+		nest0_1 [label="Astronaut Training" color="#BA68C8" fillcolor="#F3E5F5" shape=multipledocuments style=filled]
+		nest0_2 [label="Emergency Protocols" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+		nest0_3 [label="Engine Overhaul" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	}
+	subgraph cluster_Data Transmission {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Data Transmission"
+		nest1_0 [label="Ground Station Coordination" color="#673AB7" fillcolor="#D1C4E9" shape=predefinedprocess style=filled]
+		nest1_1 [label="Hypersonic Flight Testing" color="#673AB7" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+		nest1_2 [label="Orbit Adjustment" color="#BA68C8" fillcolor="#F3E5F5" shape=document style=filled]
+		nest1_3 [label="Rocket Assembly" color="#673AB7" fillcolor="#D1C4E9" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#673AB7" penwidth=1.5 style=dashed label="transmits" dir=forward]
+	N2 -> N3 [color="#BA68C8" penwidth=1.5 style=dashed label="forecasts" dir=forward]
+	N3 -> N4 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest0_0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N2 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#BA68C8" penwidth=1.5 style=solid label="tests" dir=forward]
+	S1 -> N5 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N4 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=dashed label="adjusts" dir=forward]
+	N3 -> M1 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N6 [color="#673AB7" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_59.dot b/test/diagrams/graph_hard/diagrams_59.dot
new file mode 100644
index 0000000000000000000000000000000000000000..be7c4782bcaec47cc4aa9c010ebc292909bea02b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_59.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=RL
+	N0 [label="Space Debris Tracking" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N1 [label="Aviation Safety Audit" color="#E91E63" fillcolor="#FCE4EC" shape=preparation style=filled]
+	N2 [label="Re_entry Vehicle Design" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N3 [label="Airframe Assembly" color="#94C0C0" fillcolor="#CADEDE" shape=multipledocuments style=filled]
+	N4 [label="Runway Inspection" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N5 [label="Aircraft Maintenance Log" color="#795548" fillcolor="#D7CCC8" shape=vnode_shape style=filled]
+	N6 [label="Flight Crew Training" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N7 [label="Emergency Protocols" color="#795548" fillcolor="#D7CCC8" shape=multipledocuments style=filled]
+	N8 [label="Avionics Installation" color="#94C0C0" fillcolor="#CADEDE" shape=rectangle style=filled]
+	N9 [label="Hypersonic Flight Testing" color="#94C0C0" fillcolor="#CADEDE" shape=predefinedprocess style=filled]
+	N10 [label="International Space Station Resupply" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N11 [label="Flight Simulation" color="#94C0C0" fillcolor="#CADEDE" shape=rectangle style=filled]
+	N12 [label="Countdown Sequence" color="#E91E63" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+	N13 [label="Mission Debriefing" color="#795548" fillcolor="#D7CCC8" shape=diamond style=filled]
+	N14 [label="Drone System Development" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N15 [label="Extravehicular Activity Planning" color="#94C0C0" fillcolor="#CADEDE" shape=preparation style=filled]
+	N16 [label="Launch Window Calculation" color="#E91E63" fillcolor="#FCE4EC" shape=rectangle style=filled]
+	N17 [label="Telemetry Setup" color="#E91E63" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N18 [label="Satellite Data Processing" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#94C0C0" fillcolor="#CADEDE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#94C0C0" fillcolor="#CADEDE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#94C0C0" fillcolor="#CADEDE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Component Recovery {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Component Recovery"
+		nest0_0 [label="Astronaut Training" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+		nest0_1 [label="Aircraft Manufacturing" color="#795548" fillcolor="#D7CCC8" shape=preparation style=filled]
+		nest0_2 [label="Orbit Adjustment" color="#E91E63" fillcolor="#FCE4EC" shape=database style=filled]
+	}
+	subgraph cluster_Rocket Assembly {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Rocket Assembly"
+		nest1_0 [label="Propulsion Testing" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+		nest1_1 [label="Launch Execution" color="#94C0C0" fillcolor="#CADEDE" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#795548" penwidth=1.5 style=solid label="guides" dir=forward]
+	N8 -> N9 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#795548" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N17 -> N18 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N16 -> nest0_0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N4 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N5 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N6 -> S0 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	S0 -> N17 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N14 -> S1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N18 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N3 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#E91E63" penwidth=1.5 style=dashed label="communicates" dir=forward]
+	N2 -> M1 [color="#795548" penwidth=1.5 style=solid dir=forward]
+	M1 -> N5 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_59.txt b/test/diagrams/graph_hard/diagrams_59.txt
new file mode 100644
index 0000000000000000000000000000000000000000..52ec7480cc683bbfeca0d421323c9eeb2b1e301d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_59.txt
@@ -0,0 +1,34 @@
+<Aircraft Maintenance Log, connectedTo, Flight Crew Training>
+<Aircraft Maintenance Log, connectedTo, Propulsion Testing>
+<Aircraft Manufacturing, connectedTo, Orbit Adjustment>
+<Airframe Assembly, connectedTo, Runway Inspection>
+<Astronaut Training, connectedTo, Aircraft Manufacturing>
+<Aviation Safety Audit, communicates, Aircraft Maintenance Log>
+<Aviation Safety Audit, connectedTo, Airframe Assembly>
+<Aviation Safety Audit, connectedTo, Re_entry Vehicle Design>
+<Avionics Installation, connectedTo, Hypersonic Flight Testing>
+<Countdown Sequence, connectedTo, Mission Debriefing>
+<Drone System Development, connectedTo, Extravehicular Activity Planning>
+<Drone System Development, connectedTo, Launch Window Calculation>
+<Drone System Development, connectedTo, Satellite Data Processing>
+<Emergency Protocols, guides, Avionics Installation>
+<Extravehicular Activity Planning, connectedTo, Launch Window Calculation>
+<Flight Crew Training, connectedTo, Emergency Protocols>
+<Flight Crew Training, connectedTo, Flight Simulation>
+<Flight Crew Training, connectedTo, Mission Debriefing>
+<Flight Crew Training, connectedTo, Telemetry Setup>
+<Flight Simulation, connectedTo, Countdown Sequence>
+<Hypersonic Flight Testing, connectedTo, International Space Station Resupply>
+<International Space Station Resupply, connectedTo, Flight Simulation>
+<Launch Execution, connectedTo, Aircraft Maintenance Log>
+<Launch Window Calculation, connectedTo, Astronaut Training>
+<Launch Window Calculation, connectedTo, Telemetry Setup>
+<Mission Debriefing, connectedTo, Drone System Development>
+<Orbit Adjustment, connectedTo, Runway Inspection>
+<Propulsion Testing, connectedTo, Launch Execution>
+<Re_entry Vehicle Design, connectedTo, Aircraft Maintenance Log>
+<Re_entry Vehicle Design, connectedTo, Airframe Assembly>
+<Runway Inspection, connectedTo, Aircraft Maintenance Log>
+<Space Debris Tracking, connectedTo, Airframe Assembly>
+<Space Debris Tracking, connectedTo, Aviation Safety Audit>
+<Telemetry Setup, connectedTo, Satellite Data Processing>
diff --git a/test/diagrams/graph_hard/diagrams_6.dot b/test/diagrams/graph_hard/diagrams_6.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9ce88f18508371438208ff1369ccdbc3c3d7fe57
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_6.dot
@@ -0,0 +1,59 @@
+digraph {
+	rankdir=TB
+	N0 [label="Device Implantation" color="#BCB88A" fillcolor="#F5F5DC" shape=rect style=filled]
+	N1 [label="Health Screening" color="#00BCD4" fillcolor="#B2EBF2" shape=document style=filled]
+	N2 [label="Mental Health Assessment" color="#00BCD4" fillcolor="#B2EBF2" shape=rectangle style=filled]
+	N3 [label="Surgery" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N4 [label="Insurance Claim" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+	N5 [label="Anesthesia Administration" color="#00BCD4" fillcolor="#B2EBF2" shape=predefinedprocess style=filled]
+	N6 [label="Patient Education" color="#00BCD4" fillcolor="#B2EBF2" shape=predefinedprocess style=filled]
+	N7 [label="Wound Care" color="#BCB88A" fillcolor="#F5F5DC" shape=rectangle style=filled]
+	N8 [label="Blood Test" color="#00BCD4" fillcolor="#B2EBF2" shape=rectangle style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#B2EBF2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Telemedicine Consultation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Telemedicine Consultation"
+		nest0_0 [label="Epidemiological Tracking" color="#BCB88A" fillcolor="#F5F5DC" shape=inputoutput style=filled]
+		nest0_1 [label="Clinical Trial" color="#BCB88A" fillcolor="#F5F5DC" shape=parallelogram style=filled]
+		nest0_2 [label="Dental Check_up" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	}
+	subgraph cluster_Discharge {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Discharge"
+		nest1_0 [label="Imaging Scan" color="#00BCD4" fillcolor="#B2EBF2" shape=rect style=filled]
+		nest1_1 [label="Vaccination" color="#388E3C" fillcolor="#F1F8E9" shape=predefinedprocess style=filled]
+		nest1_2 [label="Biopsy" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+		nest1_3 [label="Rehabilitation Therapy" color="#388E3C" fillcolor="#F1F8E9" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#388E3C" penwidth=1.5 style=dashed label="triages" dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid label="schedules" dir=forward]
+	N3 -> N4 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#388E3C" penwidth=1.5 style=solid label="coordinates" dir=forward]
+	N5 -> N6 [color="#388E3C" penwidth=1.5 style=dashed label="tests" dir=forward]
+	N6 -> N7 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest0_0 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest1_0 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N6 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_6.txt b/test/diagrams/graph_hard/diagrams_6.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a041d16d534aa12e9286cd32763929b2daa36218
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_6.txt
@@ -0,0 +1,28 @@
+<Anesthesia Administration, connectedTo, Blood Test>
+<Anesthesia Administration, connectedTo, Wound Care>
+<Anesthesia Administration, tests, Patient Education>
+<Biopsy, connectedTo, Rehabilitation Therapy>
+<Biopsy, partOf, Biopsy>
+<Clinical Trial, connectedTo, Dental Check_up>
+<Dental Check_up, connectedTo, Surgery>
+<Device Implantation, connectedTo, Patient Education>
+<Device Implantation, connectedTo, Wound Care>
+<Device Implantation, triages, Health Screening>
+<Epidemiological Tracking, connectedTo, Clinical Trial>
+<Health Screening, connectedTo, Mental Health Assessment>
+<Imaging Scan, connectedTo, Vaccination>
+<Imaging Scan, partOf, Imaging Scan>
+<Insurance Claim, coordinates, Anesthesia Administration>
+<Mental Health Assessment, connectedTo, Anesthesia Administration>
+<Mental Health Assessment, connectedTo, Blood Test>
+<Mental Health Assessment, connectedTo, Insurance Claim>
+<Mental Health Assessment, schedules, Surgery>
+<Patient Education, connectedTo, Wound Care>
+<Rehabilitation Therapy, connectedTo, Patient Education>
+<Rehabilitation Therapy, partOf, Rehabilitation Therapy>
+<Surgery, connectedTo, Imaging Scan>
+<Surgery, connectedTo, Insurance Claim>
+<Vaccination, connectedTo, Biopsy>
+<Vaccination, partOf, Vaccination>
+<Wound Care, connectedTo, Blood Test>
+<Wound Care, connectedTo, Epidemiological Tracking>
diff --git a/test/diagrams/graph_hard/diagrams_60.dot b/test/diagrams/graph_hard/diagrams_60.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5d514e4250eede0a8ec9f84c2e45a5fffec4ad63
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_60.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=TB
+	N0 [label="Fueling Procedure" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N1 [label="Mission Debriefing" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+	N2 [label="Rocket Assembly" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+	N3 [label="Drone System Development" color="#FFD54F" fillcolor="#FFF8E1" shape=document style=filled]
+	N4 [label="Thermal Shield Testing" color="#388E3C" fillcolor="#F1F8E9" shape=preparation style=filled]
+	N5 [label="Countdown Sequence" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+	N6 [label="Aircraft Manufacturing" color="#FFE470" fillcolor="#FFFAE0" shape=preparation style=filled]
+	N7 [label="Flight Crew Training" color="#FFE470" fillcolor="#FFFAE0" shape=preparation style=filled]
+	N8 [label="Aircraft Maintenance Log" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N9 [label="Runway Inspection" color="#FFD54F" fillcolor="#FFF8E1" shape=multipledocuments style=filled]
+	N10 [label="Satellite Data Processing" color="#388E3C" fillcolor="#F1F8E9" shape=vnode_shape style=filled]
+	N11 [label="Payload Integration" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N12 [label="Air Traffic Control Integration" color="#FFE470" fillcolor="#FFFAE0" shape=preparation style=filled]
+	N13 [label="Engine Overhaul" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+	N14 [label="Launch Execution" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	S0 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFE470" fillcolor="#FFFAE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Telemetry Setup {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Telemetry Setup"
+		nest0_0 [label="New Material Development" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+		nest0_1 [label="Spacecraft Telemetry Analysis" color="#FFD54F" fillcolor="#FFF8E1" shape=action style=filled]
+		nest0_2 [label="Airframe Assembly" color="#FFE470" fillcolor="#FFFAE0" shape=preparation style=filled]
+	}
+	subgraph cluster_Extravehicular Activity Planning {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Extravehicular Activity Planning"
+		nest1_0 [label="Satellite Configuration" color="#FFE470" fillcolor="#FFFAE0" shape=document style=filled]
+		nest1_1 [label="Re_entry Vehicle Design" color="#FFD54F" fillcolor="#FFF8E1" shape=action style=filled]
+		nest1_2 [label="Mission Planning" color="#FFD54F" fillcolor="#FFF8E1" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> nest0_0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N4 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest1_0 [color="#388E3C" penwidth=1.5 style=dashed label="executes" dir=forward]
+	nest1_2 -> N3 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#FFD54F" penwidth=1.5 style=solid label="repairs" dir=forward]
+	N0 -> S1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#FFE470" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S1 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	M0 -> N7 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N12 -> M1 [color="#FFE470" penwidth=1.5 style=solid dir=forward]
+	N6 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N14 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_60.txt b/test/diagrams/graph_hard/diagrams_60.txt
new file mode 100644
index 0000000000000000000000000000000000000000..66ed2eb49932c81ba5d72c87ebd796025700689c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_60.txt
@@ -0,0 +1,34 @@
+<Air Traffic Control Integration, connectedTo, Engine Overhaul>
+<Air Traffic Control Integration, connectedTo, Launch Execution>
+<Aircraft Maintenance Log, connectedTo, Runway Inspection>
+<Aircraft Manufacturing, connectedTo, Flight Crew Training>
+<Aircraft Manufacturing, connectedTo, Launch Execution>
+<Airframe Assembly, connectedTo, Thermal Shield Testing>
+<Countdown Sequence, connectedTo, Aircraft Manufacturing>
+<Countdown Sequence, executes, Satellite Configuration>
+<Drone System Development, connectedTo, Flight Crew Training>
+<Drone System Development, connectedTo, Thermal Shield Testing>
+<Engine Overhaul, connectedTo, Launch Execution>
+<Flight Crew Training, connectedTo, Aircraft Maintenance Log>
+<Flight Crew Training, connectedTo, Launch Execution>
+<Fueling Procedure, connectedTo, Air Traffic Control Integration>
+<Fueling Procedure, connectedTo, Drone System Development>
+<Fueling Procedure, connectedTo, Flight Crew Training>
+<Fueling Procedure, connectedTo, Mission Debriefing>
+<Fueling Procedure, connectedTo, Runway Inspection>
+<Mission Debriefing, connectedTo, Engine Overhaul>
+<Mission Debriefing, connectedTo, Launch Execution>
+<Mission Debriefing, connectedTo, Rocket Assembly>
+<Mission Debriefing, repairs, Aircraft Manufacturing>
+<Mission Planning, connectedTo, Drone System Development>
+<New Material Development, connectedTo, Spacecraft Telemetry Analysis>
+<Payload Integration, connectedTo, Air Traffic Control Integration>
+<Re_entry Vehicle Design, connectedTo, Mission Planning>
+<Rocket Assembly, connectedTo, Drone System Development>
+<Rocket Assembly, connectedTo, Flight Crew Training>
+<Runway Inspection, connectedTo, Satellite Data Processing>
+<Satellite Configuration, connectedTo, Re_entry Vehicle Design>
+<Satellite Data Processing, connectedTo, New Material Development>
+<Satellite Data Processing, connectedTo, Payload Integration>
+<Spacecraft Telemetry Analysis, connectedTo, Airframe Assembly>
+<Thermal Shield Testing, connectedTo, Countdown Sequence>
diff --git a/test/diagrams/graph_hard/diagrams_61.dot b/test/diagrams/graph_hard/diagrams_61.dot
new file mode 100644
index 0000000000000000000000000000000000000000..409261506ee3de11952b55db781b61f08d122374
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_61.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=RL
+	N0 [label="Business Interruption Coverage" color="#64B5F6" fillcolor="#E3F2FD" shape=preparation style=filled]
+	N1 [label="Payment Processing" color="#64B5F6" fillcolor="#E3F2FD" shape=inputoutput style=filled]
+	N2 [label="Benefit Payout" color="#64B5F6" fillcolor="#E3F2FD" shape=document style=filled]
+	N3 [label="Healthcare Provider Network Management" color="#64B5F6" fillcolor="#E3F2FD" shape=document style=filled]
+	N4 [label="Investment Management for Reserves" color="#64B5F6" fillcolor="#E3F2FD" shape=rect style=filled]
+	N5 [label="Policy Application" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N6 [label="Fraud Investigation" color="#64B5F6" fillcolor="#E3F2FD" shape=vnode_shape style=filled]
+	N7 [label="Coverage Review" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N8 [label="Policy Cancellation" color="#FFCC7A" fillcolor="#FFF6D9" shape=parallelogram style=filled]
+	N9 [label="Market Research" color="#64B5F6" fillcolor="#E3F2FD" shape=multipledocuments style=filled]
+	N10 [label="Legal Review of Claims" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N11 [label="Underwriting" color="#FFC107" fillcolor="#FFECB3" shape=rect style=filled]
+	N12 [label="Customer Onboarding" color="#FFCC7A" fillcolor="#FFF6D9" shape=predefinedprocess style=filled]
+	N13 [label="Reinsurance Negotiation" color="#FFCC7A" fillcolor="#FFF6D9" shape=preparation style=filled]
+	N14 [label="Auto Accident Claims" color="#FFC107" fillcolor="#FFECB3" shape=inputoutput style=filled]
+	N15 [label="Agent Training" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N16 [label="Customer Communication" color="#FFC107" fillcolor="#FFECB3" shape=rectangle style=filled]
+	S1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFCC7A" fillcolor="#FFF6D9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#64B5F6" fillcolor="#E3F2FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFC107" fillcolor="#FFECB3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Catastrophe Modeling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Catastrophe Modeling"
+		nest0_0 [label="Cyber Insurance Policy" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+		nest0_1 [label="Customer Support" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+		nest0_2 [label="Third_Party Administrator Liaison" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+		nest0_3 [label="Product Development" color="#FFCC7A" fillcolor="#FFF6D9" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Policy Issuance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Policy Issuance"
+		nest1_0 [label="Subrogation" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+		nest1_1 [label="Compliance Reporting" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest1_2 [label="Policy Renewal" color="#FFCC7A" fillcolor="#FFF6D9" shape=rect style=filled]
+		nest1_3 [label="Actuarial Analysis" color="#FFCC7A" fillcolor="#FFF6D9" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFC107" penwidth=1.5 style=solid label="optimizes" dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest0_0 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S1 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#FFCC7A" penwidth=1.5 style=dashed label="policies" dir=forward]
+	S1 -> N12 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N3 [color="#FFC107" penwidth=1.5 style=solid label="models" dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N6 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> M2 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+	N9 -> M2 [color="#FFCC7A" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N11 [color="#FFCC7A" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_61.txt b/test/diagrams/graph_hard/diagrams_61.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f22bac5c358d5b98caa9a60b0fe7cf669056c9f7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_61.txt
@@ -0,0 +1,36 @@
+<Actuarial Analysis, connectedTo, Reinsurance Negotiation>
+<Agent Training, connectedTo, Customer Communication>
+<Auto Accident Claims, connectedTo, Agent Training>
+<Benefit Payout, connectedTo, Healthcare Provider Network Management>
+<Business Interruption Coverage, connectedTo, Coverage Review>
+<Business Interruption Coverage, connectedTo, Customer Onboarding>
+<Business Interruption Coverage, connectedTo, Fraud Investigation>
+<Business Interruption Coverage, connectedTo, Payment Processing>
+<Business Interruption Coverage, models, Healthcare Provider Network Management>
+<Business Interruption Coverage, policies, Investment Management for Reserves>
+<Compliance Reporting, connectedTo, Policy Renewal>
+<Coverage Review, connectedTo, Policy Cancellation>
+<Customer Onboarding, connectedTo, Reinsurance Negotiation>
+<Customer Support, connectedTo, Third_Party Administrator Liaison>
+<Cyber Insurance Policy, connectedTo, Customer Support>
+<Fraud Investigation, connectedTo, Coverage Review>
+<Healthcare Provider Network Management, connectedTo, Fraud Investigation>
+<Healthcare Provider Network Management, optimizes, Investment Management for Reserves>
+<Investment Management for Reserves, connectedTo, Coverage Review>
+<Investment Management for Reserves, connectedTo, Policy Application>
+<Legal Review of Claims, connectedTo, Underwriting>
+<Market Research, connectedTo, Cyber Insurance Policy>
+<Market Research, connectedTo, Legal Review of Claims>
+<Market Research, connectedTo, Underwriting>
+<Payment Processing, connectedTo, Benefit Payout>
+<Payment Processing, connectedTo, Subrogation>
+<Policy Application, connectedTo, Coverage Review>
+<Policy Application, connectedTo, Fraud Investigation>
+<Policy Cancellation, connectedTo, Market Research>
+<Policy Cancellation, connectedTo, Underwriting>
+<Policy Renewal, connectedTo, Actuarial Analysis>
+<Product Development, connectedTo, Coverage Review>
+<Reinsurance Negotiation, connectedTo, Auto Accident Claims>
+<Subrogation, connectedTo, Compliance Reporting>
+<Third_Party Administrator Liaison, connectedTo, Product Development>
+<Underwriting, connectedTo, Customer Onboarding>
diff --git a/test/diagrams/graph_hard/diagrams_62.dot b/test/diagrams/graph_hard/diagrams_62.dot
new file mode 100644
index 0000000000000000000000000000000000000000..96b71eb7aeb5ce1d85e69f35a31b3658fa931d80
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_62.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=LR
+	N0 [label="Third_Party Administrator Liaison" color="#6FE1D5" fillcolor="#C9EFEC" shape=document style=filled]
+	N1 [label="Data Security" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N2 [label="Life Insurance Underwriting" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N3 [label="Risk Assessment" color="#6FE1D5" fillcolor="#C9EFEC" shape=database style=filled]
+	N4 [label="Auto Accident Claims" color="#6FE1D5" fillcolor="#C9EFEC" shape=database style=filled]
+	N5 [label="Claims Litigation Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=vnode_shape style=filled]
+	N6 [label="Catastrophe Modeling" color="#AED581" fillcolor="#F0F4C3" shape=multipledocuments style=filled]
+	N7 [label="Business Interruption Coverage" color="#90A4AE" fillcolor="#ECEFF1" shape=rectangle style=filled]
+	N8 [label="Legal Review of Claims" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	S0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Cyber Insurance Policy {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Cyber Insurance Policy"
+		nest0_0 [label="Policy Cancellation" color="#6FE1D5" fillcolor="#C9EFEC" shape=preparation style=filled]
+		nest0_1 [label="Annuity Sales" color="#90A4AE" fillcolor="#ECEFF1" shape=document style=filled]
+		nest0_2 [label="Payment Processing" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	}
+	subgraph cluster_Policy Renewal {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Policy Renewal"
+		nest1_0 [label="Loss Prevention" color="#6FE1D5" fillcolor="#C9EFEC" shape=document style=filled]
+		nest1_1 [label="Customer Support" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+		nest1_2 [label="Underwriting" color="#6FE1D5" fillcolor="#C9EFEC" shape=action style=filled]
+		nest1_3 [label="Subrogation" color="#AED581" fillcolor="#F0F4C3" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest0_0 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N8 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S0 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N4 -> S1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#6FE1D5" penwidth=1.5 style=solid label="approves" dir=forward]
+	S1 -> N7 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	M0 -> N6 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N4 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M2 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	M2 -> N8 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_62.txt b/test/diagrams/graph_hard/diagrams_62.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d7b0a6a367bf70fbb880a326819f1617bcf848af
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_62.txt
@@ -0,0 +1,29 @@
+<Annuity Sales, connectedTo, Payment Processing>
+<Auto Accident Claims, approves, Catastrophe Modeling>
+<Auto Accident Claims, connectedTo, Business Interruption Coverage>
+<Auto Accident Claims, connectedTo, Catastrophe Modeling>
+<Auto Accident Claims, connectedTo, Claims Litigation Management>
+<Auto Accident Claims, connectedTo, Legal Review of Claims>
+<Business Interruption Coverage, connectedTo, Legal Review of Claims>
+<Catastrophe Modeling, connectedTo, Business Interruption Coverage>
+<Catastrophe Modeling, connectedTo, Legal Review of Claims>
+<Claims Litigation Management, connectedTo, Catastrophe Modeling>
+<Claims Litigation Management, connectedTo, Loss Prevention>
+<Customer Support, connectedTo, Underwriting>
+<Data Security, connectedTo, Auto Accident Claims>
+<Data Security, connectedTo, Catastrophe Modeling>
+<Data Security, connectedTo, Life Insurance Underwriting>
+<Data Security, connectedTo, Policy Cancellation>
+<Life Insurance Underwriting, connectedTo, Auto Accident Claims>
+<Life Insurance Underwriting, connectedTo, Catastrophe Modeling>
+<Life Insurance Underwriting, connectedTo, Risk Assessment>
+<Loss Prevention, connectedTo, Customer Support>
+<Payment Processing, connectedTo, Risk Assessment>
+<Policy Cancellation, connectedTo, Annuity Sales>
+<Risk Assessment, connectedTo, Auto Accident Claims>
+<Risk Assessment, connectedTo, Catastrophe Modeling>
+<Risk Assessment, connectedTo, Legal Review of Claims>
+<Subrogation, connectedTo, Legal Review of Claims>
+<Third_Party Administrator Liaison, connectedTo, Auto Accident Claims>
+<Third_Party Administrator Liaison, connectedTo, Data Security>
+<Underwriting, connectedTo, Subrogation>
diff --git a/test/diagrams/graph_hard/diagrams_63.txt b/test/diagrams/graph_hard/diagrams_63.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a7e8d2155f01353278c2233542cc4e978959dc08
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_63.txt
@@ -0,0 +1,35 @@
+<Agent Training, connectedTo, Broker Management>
+<Broker Management, connectedTo, Underwriting>
+<Business Interruption Coverage, investigates, Claims Litigation Management>
+<Claim Adjustment, connectedTo, Policy Cancellation>
+<Claim Submission, regulates, Premium Calculation>
+<Claims Litigation Management, connectedTo, Claim Adjustment>
+<Claims Litigation Management, connectedTo, Premium Calculation>
+<Compliance Reporting, connectedTo, Coverage Review>
+<Coverage Review, connectedTo, Fraud Investigation>
+<Customer Communication, connectedTo, Claim Submission>
+<Customer Onboarding, connectedTo, Customer Communication>
+<Customer Onboarding, connectedTo, Subrogation>
+<Fraud Investigation, pays, Life Insurance Underwriting>
+<Healthcare Provider Network Management, connectedTo, Premium Calculation>
+<Healthcare Provider Network Management, connectedTo, Risk Assessment>
+<Life Insurance Underwriting, connectedTo, Premium Calculation>
+<Loss Prevention, connectedTo, Telematics Data Analysis>
+<Payment Processing, connectedTo, Customer Onboarding>
+<Payment Processing, connectedTo, Policy Issuance>
+<Policy Cancellation, connectedTo, Compliance Reporting>
+<Policy Issuance, connectedTo, Property Damage Assessment>
+<Premium Calculation, processes, Legal Review of Claims>
+<Property Damage Assessment, assesses, Payment Processing>
+<Risk Assessment, connectedTo, Fraud Investigation>
+<Risk Assessment, connectedTo, Legal Review of Claims>
+<Risk Assessment, connectedTo, Loss Prevention>
+<Risk Assessment, connectedTo, Telematics Data Analysis>
+<Subrogation, connectedTo, Business Interruption Coverage>
+<Telematics Data Analysis, connectedTo, Payment Processing>
+<Third_Party Administrator Liaison, audits, Loss Prevention>
+<Third_Party Administrator Liaison, connectedTo, Agent Training>
+<Third_Party Administrator Liaison, connectedTo, Broker Management>
+<Third_Party Administrator Liaison, connectedTo, Claim Adjustment>
+<Underwriting, connectedTo, Healthcare Provider Network Management>
+<Underwriting, connectedTo, Premium Calculation>
diff --git a/test/diagrams/graph_hard/diagrams_64.dot b/test/diagrams/graph_hard/diagrams_64.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9d0636e974a030c6969adc5a144b58099ca94412
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_64.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=RL
+	N0 [label="Security Awareness Training" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N1 [label="Application Security" color="#64B5F6" fillcolor="#E3F2FD" shape=rect style=filled]
+	N2 [label="Intrusion Prevention" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N3 [label="Security Audit" color="#EAEFA5" fillcolor="#FDFCEB" shape=multipledocuments style=filled]
+	N4 [label="Malware Analysis" color="#FFCC80" fillcolor="#FFF0CC" shape=vnode_shape style=filled]
+	N5 [label="Mobile Security" color="#EAEFA5" fillcolor="#FDFCEB" shape=document style=filled]
+	N6 [label="Access Control" color="#FFCC80" fillcolor="#FFF0CC" shape=preparation style=filled]
+	N7 [label="Firewall Configuration" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N8 [label="Risk Management Framework" color="#EAEFA5" fillcolor="#FDFCEB" shape=rect style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFCC80" fillcolor="#FFF0CC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFCC80" fillcolor="#FFF0CC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFCC80" fillcolor="#FFF0CC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Security Operations Center Monitoring {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Security Operations Center Monitoring"
+		nest0_0 [label="Security Information and Event Management" color="#64B5F6" fillcolor="#E3F2FD" shape=inputoutput style=filled]
+		nest0_1 [label="Cryptography Implementation" color="#EAEFA5" fillcolor="#FDFCEB" shape=rect style=filled]
+		nest0_2 [label="Security Policy Development" color="#EAEFA5" fillcolor="#FDFCEB" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Phishing Simulation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Phishing Simulation"
+		nest1_0 [label="Network Security" color="#EAEFA5" fillcolor="#FDFCEB" shape=rect style=filled]
+		nest1_1 [label="Identity Management" color="#64B5F6" fillcolor="#E3F2FD" shape=vnode_shape style=filled]
+		nest1_2 [label="Endpoint Protection" color="#EAEFA5" fillcolor="#FDFCEB" shape=document style=filled]
+	}
+	N0 -> N1 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#64B5F6" penwidth=1.5 style=solid label="blocks" dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#64B5F6" penwidth=1.5 style=solid label="trains" dir=forward]
+	nest0_0 -> nest0_1 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest0_0 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N4 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#EAEFA5" penwidth=1.5 style=solid label="notifies" dir=forward]
+	N4 -> nest1_0 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N4 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N3 -> S2 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N8 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N5 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N7 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#64B5F6" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#64B5F6" penwidth=1.5 style=solid dir=forward]
+	M0 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#FFCC80" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#FFCC80" penwidth=1.5 style=dashed label="filters" dir=forward]
+	M1 -> N7 [color="#FFCC80" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_64.txt b/test/diagrams/graph_hard/diagrams_64.txt
new file mode 100644
index 0000000000000000000000000000000000000000..357d7f3eb54d4d587ae30f8ae65cbb5f9fcf0064
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_64.txt
@@ -0,0 +1,33 @@
+<Access Control, connectedTo, Firewall Configuration>
+<Application Security, connectedTo, Firewall Configuration>
+<Application Security, connectedTo, Intrusion Prevention>
+<Application Security, connectedTo, Malware Analysis>
+<Application Security, connectedTo, Mobile Security>
+<Application Security, connectedTo, Risk Management Framework>
+<Application Security, connectedTo, Security Audit>
+<Application Security, connectedTo, Security Information and Event Management>
+<Cryptography Implementation, connectedTo, Security Policy Development>
+<Endpoint Protection, connectedTo, Security Audit>
+<Firewall Configuration, trains, Risk Management Framework>
+<Identity Management, notifies, Endpoint Protection>
+<Intrusion Prevention, blocks, Security Audit>
+<Intrusion Prevention, connectedTo, Access Control>
+<Intrusion Prevention, connectedTo, Firewall Configuration>
+<Intrusion Prevention, connectedTo, Malware Analysis>
+<Intrusion Prevention, connectedTo, Mobile Security>
+<Intrusion Prevention, filters, Firewall Configuration>
+<Malware Analysis, connectedTo, Mobile Security>
+<Malware Analysis, connectedTo, Network Security>
+<Mobile Security, connectedTo, Access Control>
+<Mobile Security, connectedTo, Firewall Configuration>
+<Network Security, connectedTo, Identity Management>
+<Security Audit, connectedTo, Access Control>
+<Security Audit, connectedTo, Firewall Configuration>
+<Security Audit, connectedTo, Malware Analysis>
+<Security Audit, connectedTo, Mobile Security>
+<Security Audit, connectedTo, Risk Management Framework>
+<Security Awareness Training, connectedTo, Application Security>
+<Security Awareness Training, connectedTo, Firewall Configuration>
+<Security Awareness Training, connectedTo, Mobile Security>
+<Security Information and Event Management, connectedTo, Cryptography Implementation>
+<Security Policy Development, connectedTo, Malware Analysis>
diff --git a/test/diagrams/graph_hard/diagrams_65.txt b/test/diagrams/graph_hard/diagrams_65.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d915c4df782311fbba144d9af7ba533d52234eb2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_65.txt
@@ -0,0 +1,29 @@
+<Access Control, connectedTo, Web Application Firewall Deployment>
+<Antivirus Management, connectedTo, DevSecOps Integration>
+<Antivirus Management, connectedTo, Insider Threat Detection>
+<Backup and Recovery, connectedTo, Security Awareness Training>
+<Backup and Recovery, connectedTo, Threat Intelligence Gathering>
+<Cloud Security, connectedTo, Threat Detection>
+<Compliance Monitoring, alerts, Cloud Security>
+<Compliance Monitoring, connectedTo, Data Encryption>
+<Compliance Monitoring, connectedTo, DevSecOps Integration>
+<Compliance Monitoring, vulnerabilities, Threat Detection>
+<Data Encryption, connectedTo, User Training>
+<DevSecOps Integration, recovers, Identity Management>
+<Disaster Recovery Planning, connectedTo, Security Policy Development>
+<Identity Management, connectedTo, Security Audit>
+<Identity Management, connectedTo, Security Awareness Training>
+<Insider Threat Detection, connectedTo, Compliance Monitoring>
+<Insider Threat Detection, connectedTo, DevSecOps Integration>
+<Insider Threat Detection, connectedTo, Zero Trust Architecture>
+<Malware Analysis, connectedTo, Antivirus Management>
+<Phishing Simulation, connectedTo, Threat Intelligence Gathering>
+<Security Audit, connectedTo, Phishing Simulation>
+<Security Awareness Training, connectedTo, Data Encryption>
+<Security Policy Development, connectedTo, DevSecOps Integration>
+<Security Policy Development, connectedTo, Security Awareness Training>
+<Threat Detection, connectedTo, Backup and Recovery>
+<Threat Intelligence Gathering, connectedTo, Disaster Recovery Planning>
+<Threat Intelligence Gathering, connectedTo, Security Awareness Training>
+<Web Application Firewall Deployment, connectedTo, Insider Threat Detection>
+<Zero Trust Architecture, connectedTo, Access Control>
diff --git a/test/diagrams/graph_hard/diagrams_66.txt b/test/diagrams/graph_hard/diagrams_66.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ce93b1bce5f862bc518d0fedbcb43c14fa7b2536
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_66.txt
@@ -0,0 +1,28 @@
+<Backup and Recovery, connectedTo, IoT Security>
+<Cloud Security, connectedTo, Security Audit>
+<Dark Web Monitoring, connectedTo, Endpoint Protection>
+<Dark Web Monitoring, connectedTo, Security Patch Management>
+<Dark Web Monitoring, connectedTo, Security Policy Development>
+<Dark Web Monitoring, connectedTo, Threat Intelligence Gathering>
+<Disaster Recovery Planning, connectedTo, Cloud Security>
+<Endpoint Protection, connectedTo, Identity Management>
+<Identity Management, connectedTo, Security Patch Management>
+<IoT Security, connectedTo, Malware Analysis>
+<Malware Analysis, connectedTo, Endpoint Protection>
+<Network Security, connectedTo, Security Patch Management>
+<Network Security, connectedTo, Security Policy Development>
+<Network Security, connectedTo, Threat Detection>
+<Security Audit, connectedTo, Zero Trust Architecture>
+<Security Patch Management, connectedTo, Threat Intelligence Gathering>
+<Threat Detection, connectedTo, Dark Web Monitoring>
+<Threat Detection, connectedTo, Disaster Recovery Planning>
+<Threat Detection, connectedTo, Security Patch Management>
+<Threat Detection, connectedTo, Security Policy Development>
+<Threat Intelligence Gathering, connectedTo, Backup and Recovery>
+<Threat Intelligence Gathering, connectedTo, Security Policy Development>
+<Web Application Firewall Deployment, connectedTo, Dark Web Monitoring>
+<Web Application Firewall Deployment, connectedTo, Endpoint Protection>
+<Web Application Firewall Deployment, connectedTo, Network Security>
+<Web Application Firewall Deployment, connectedTo, Security Patch Management>
+<Web Application Firewall Deployment, connectedTo, Security Policy Development>
+<Zero Trust Architecture, connectedTo, Endpoint Protection>
diff --git a/test/diagrams/graph_hard/diagrams_67.dot b/test/diagrams/graph_hard/diagrams_67.dot
new file mode 100644
index 0000000000000000000000000000000000000000..00a0bc052577ffd4058efc9490e000b2e4f37019
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_67.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=RL
+	N0 [label="Energy Monitoring" color="#9575CD" fillcolor="#EDE7F6" shape=document style=filled]
+	N1 [label="Emergency Service Connection" color="#BA68C8" fillcolor="#F3E5F5" shape=document style=filled]
+	N2 [label="Home Security System Activation" color="#9575CD" fillcolor="#EDE7F6" shape=multipledocuments style=filled]
+	N3 [label="Lighting Automation" color="#BA68C8" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N4 [label="Smart Mirror Functionality" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N5 [label="Scene Creation" color="#BA68C8" fillcolor="#F3E5F5" shape=vnode_shape style=filled]
+	N6 [label="Smart Appliance Control" color="#80DDEA" fillcolor="#D3F7F9" shape=preparation style=filled]
+	N7 [label="Intercom System" color="#9575CD" fillcolor="#EDE7F6" shape=preparation style=filled]
+	N8 [label="Device Pairing" color="#BA68C8" fillcolor="#F3E5F5" shape=vnode_shape style=filled]
+	N9 [label="Irrigation System Control" color="#BA68C8" fillcolor="#F3E5F5" shape=action style=filled]
+	N10 [label="Guest Access Management" color="#80DDEA" fillcolor="#D3F7F9" shape=document style=filled]
+	S0 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#80DDEA" fillcolor="#D3F7F9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Air Quality Monitoring {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Air Quality Monitoring"
+		nest0_0 [label="Security Alert" color="#BA68C8" fillcolor="#F3E5F5" shape=document style=filled]
+		nest0_1 [label="Door Lock Management" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+		nest0_2 [label="Centralized Hub Configuration" color="#80DDEA" fillcolor="#D3F7F9" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_App Control {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="App Control"
+		nest1_0 [label="Geofencing Trigger" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+		nest1_1 [label="Remote Control" color="#BA68C8" fillcolor="#F3E5F5" shape=diamond style=filled]
+		nest1_2 [label="Sound System Integration" color="#BA68C8" fillcolor="#F3E5F5" shape=rect style=filled]
+		nest1_3 [label="Doorbell Camera Alert" color="#9575CD" fillcolor="#EDE7F6" shape=document style=filled]
+	}
+	N0 -> N1 [color="#80DDEA" penwidth=1.5 style=solid label="connects" dir=forward]
+	N1 -> N2 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#BA68C8" penwidth=1.5 style=solid label="personalizes" dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#9575CD" penwidth=1.5 style=dashed label="heats" dir=forward]
+	nest0_0 -> nest0_1 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N3 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest1_0 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N1 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N0 -> S1 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#9575CD" penwidth=1.5 style=solid label="senses" dir=forward]
+	M1 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#80DDEA" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N7 [color="#80DDEA" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_67.txt b/test/diagrams/graph_hard/diagrams_67.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e06da814d3db52dbb9291de8f0a3bb1d4ff46816
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_67.txt
@@ -0,0 +1,28 @@
+<Centralized Hub Configuration, connectedTo, Lighting Automation>
+<Device Pairing, connectedTo, Geofencing Trigger>
+<Device Pairing, connectedTo, Irrigation System Control>
+<Door Lock Management, connectedTo, Centralized Hub Configuration>
+<Doorbell Camera Alert, connectedTo, Emergency Service Connection>
+<Emergency Service Connection, connectedTo, Home Security System Activation>
+<Emergency Service Connection, connectedTo, Smart Mirror Functionality>
+<Energy Monitoring, connectedTo, Intercom System>
+<Energy Monitoring, connectedTo, Irrigation System Control>
+<Energy Monitoring, connectedTo, Smart Mirror Functionality>
+<Energy Monitoring, connects, Emergency Service Connection>
+<Geofencing Trigger, connectedTo, Remote Control>
+<Home Security System Activation, connectedTo, Intercom System>
+<Home Security System Activation, connectedTo, Lighting Automation>
+<Home Security System Activation, senses, Smart Mirror Functionality>
+<Intercom System, personalizes, Device Pairing>
+<Irrigation System Control, heats, Guest Access Management>
+<Lighting Automation, connectedTo, Guest Access Management>
+<Lighting Automation, connectedTo, Smart Appliance Control>
+<Lighting Automation, connectedTo, Smart Mirror Functionality>
+<Remote Control, connectedTo, Sound System Integration>
+<Scene Creation, connectedTo, Intercom System>
+<Scene Creation, connectedTo, Smart Appliance Control>
+<Security Alert, connectedTo, Door Lock Management>
+<Smart Appliance Control, connectedTo, Intercom System>
+<Smart Mirror Functionality, connectedTo, Scene Creation>
+<Smart Mirror Functionality, connectedTo, Security Alert>
+<Sound System Integration, connectedTo, Doorbell Camera Alert>
diff --git a/test/diagrams/graph_hard/diagrams_68.dot b/test/diagrams/graph_hard/diagrams_68.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4a96b702e1e1998d1cd4a7476893e5edfec2c4d1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_68.dot
@@ -0,0 +1,89 @@
+digraph {
+	rankdir=RL
+	N0 [label="Intercom System" color="#AED581" fillcolor="#F0F4C3" shape=database style=filled]
+	N1 [label="Smart Appliance Control" color="#AED581" fillcolor="#F0F4C3" shape=database style=filled]
+	N2 [label="Curtain Automation" color="#7E57C2" fillcolor="#D1C4E9" shape=vnode_shape style=filled]
+	N3 [label="Air Quality Monitoring" color="#AED581" fillcolor="#F0F4C3" shape=parallelogram style=filled]
+	N4 [label="Geofencing Trigger" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N5 [label="Guest Access Management" color="#AED581" fillcolor="#F0F4C3" shape=database style=filled]
+	N6 [label="Sound System Integration" color="#AED581" fillcolor="#F0F4C3" shape=vnode_shape style=filled]
+	N7 [label="Security Alert" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N8 [label="App Control" color="#AED581" fillcolor="#F0F4C3" shape=inputoutput style=filled]
+	N9 [label="Leak Detection" color="#7E57C2" fillcolor="#D1C4E9" shape=multipledocuments style=filled]
+	N10 [label="Scene Creation" color="#AED581" fillcolor="#F0F4C3" shape=rect style=filled]
+	N11 [label="Emergency Service Connection" color="#AED581" fillcolor="#F0F4C3" shape=predefinedprocess style=filled]
+	N12 [label="Smoke Alarm Integration" color="#73C6BC" fillcolor="#D0EFEE" shape=multipledocuments style=filled]
+	N13 [label="Lighting Automation" color="#AED581" fillcolor="#F0F4C3" shape=preparation style=filled]
+	N14 [label="Power Outage Notification" color="#73C6BC" fillcolor="#D0EFEE" shape=preparation style=filled]
+	N15 [label="Thermostat Adjustment" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N16 [label="Smart Mirror Functionality" color="#AED581" fillcolor="#F0F4C3" shape=vnode_shape style=filled]
+	S0 [label="" color="#73C6BC" fillcolor="#D0EFEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#AED581" fillcolor="#F0F4C3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Centralized Hub Configuration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Centralized Hub Configuration"
+		nest0_0 [label="Irrigation System Control" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+		nest0_1 [label="Firmware Update" color="#7E57C2" fillcolor="#D1C4E9" shape=action style=filled]
+		nest0_2 [label="Device Pairing" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	}
+	subgraph cluster_Routine Scheduling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Routine Scheduling"
+		nest1_0 [label="Energy Monitoring" color="#7E57C2" fillcolor="#D1C4E9" shape=multipledocuments style=filled]
+		nest1_1 [label="Garage Door Control" color="#AED581" fillcolor="#F0F4C3" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed label="reports" dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#7E57C2" penwidth=1.5 style=dashed label="automates" dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N10 -> nest0_0 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N15 [color="#7E57C2" penwidth=1.5 style=solid label="integrates" dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest1_0 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N7 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S0 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#7E57C2" penwidth=1.5 style=solid label="locks" dir=forward]
+	N12 -> S1 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> S2 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N13 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	S2 -> N15 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#7E57C2" penwidth=1.5 style=dashed label="lights" dir=forward]
+	M0 -> N8 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#73C6BC" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#AED581" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> M2 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N10 -> M2 [color="#AED581" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M2 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_68.txt b/test/diagrams/graph_hard/diagrams_68.txt
new file mode 100644
index 0000000000000000000000000000000000000000..42129a11463d85e9d7e4dbd13c49a9eeae8ca730
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_68.txt
@@ -0,0 +1,41 @@
+<Air Quality Monitoring, connectedTo, Geofencing Trigger>
+<Air Quality Monitoring, connectedTo, Security Alert>
+<App Control, connectedTo, Leak Detection>
+<Curtain Automation, connectedTo, Air Quality Monitoring>
+<Device Pairing, integrates, Thermostat Adjustment>
+<Emergency Service Connection, connectedTo, Smoke Alarm Integration>
+<Energy Monitoring, connectedTo, Garage Door Control>
+<Firmware Update, connectedTo, Device Pairing>
+<Garage Door Control, connectedTo, Security Alert>
+<Geofencing Trigger, connectedTo, Emergency Service Connection>
+<Geofencing Trigger, connectedTo, Guest Access Management>
+<Geofencing Trigger, connectedTo, Scene Creation>
+<Geofencing Trigger, connectedTo, Security Alert>
+<Geofencing Trigger, lights, App Control>
+<Geofencing Trigger, locks, Lighting Automation>
+<Guest Access Management, connectedTo, Sound System Integration>
+<Intercom System, connectedTo, App Control>
+<Intercom System, connectedTo, Security Alert>
+<Intercom System, connectedTo, Smart Appliance Control>
+<Irrigation System Control, connectedTo, Firmware Update>
+<Leak Detection, connectedTo, Energy Monitoring>
+<Leak Detection, connectedTo, Scene Creation>
+<Lighting Automation, connectedTo, Power Outage Notification>
+<Power Outage Notification, automates, Thermostat Adjustment>
+<Scene Creation, connectedTo, Emergency Service Connection>
+<Scene Creation, connectedTo, Irrigation System Control>
+<Scene Creation, connectedTo, Thermostat Adjustment>
+<Security Alert, connectedTo, Thermostat Adjustment>
+<Security Alert, reports, App Control>
+<Smart Appliance Control, connectedTo, Curtain Automation>
+<Smart Appliance Control, connectedTo, Security Alert>
+<Smoke Alarm Integration, connectedTo, Lighting Automation>
+<Smoke Alarm Integration, connectedTo, Power Outage Notification>
+<Smoke Alarm Integration, connectedTo, Smart Mirror Functionality>
+<Smoke Alarm Integration, connectedTo, Thermostat Adjustment>
+<Sound System Integration, connectedTo, App Control>
+<Sound System Integration, connectedTo, Lighting Automation>
+<Sound System Integration, connectedTo, Scene Creation>
+<Sound System Integration, connectedTo, Security Alert>
+<Sound System Integration, connectedTo, Thermostat Adjustment>
+<Thermostat Adjustment, connectedTo, Smart Mirror Functionality>
diff --git a/test/diagrams/graph_hard/diagrams_69.dot b/test/diagrams/graph_hard/diagrams_69.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7b6ec63f54bafe3145ee90f4237dcb567f6c4956
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_69.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=LR
+	N0 [label="Doorbell Camera Alert" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N1 [label="Leak Detection" color="#D3EB9F" fillcolor="#F8FDD3" shape=multipledocuments style=filled]
+	N2 [label="Emergency Service Connection" color="#D3EB9F" fillcolor="#F8FDD3" shape=rect style=filled]
+	N3 [label="Home Security System Activation" color="#D3EB9F" fillcolor="#F8FDD3" shape=rect style=filled]
+	N4 [label="Air Quality Monitoring" color="#4285F4" fillcolor="#D0E0F8" shape=rectangle style=filled]
+	N5 [label="App Control" color="#8C9EFF" fillcolor="#D3D7EB" shape=diamond style=filled]
+	N6 [label="Water Heater Control" color="#4285F4" fillcolor="#D0E0F8" shape=preparation style=filled]
+	N7 [label="Door Lock Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+	N8 [label="Smoke Alarm Integration" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N9 [label="Power Outage Notification" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N10 [label="Thermostat Adjustment" color="#D3EB9F" fillcolor="#F8FDD3" shape=rect style=filled]
+	N11 [label="Intercom System" color="#4285F4" fillcolor="#D0E0F8" shape=rect style=filled]
+	S0 [label="" color="#4285F4" fillcolor="#D0E0F8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#4285F4" fillcolor="#D0E0F8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#4285F4" fillcolor="#D0E0F8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#8C9EFF" fillcolor="#D3D7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Scene Creation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Scene Creation"
+		nest0_0 [label="Security Alert" color="#8C9EFF" fillcolor="#D3D7EB" shape=preparation style=filled]
+		nest0_1 [label="Voice Command" color="#8C9EFF" fillcolor="#D3D7EB" shape=rect style=filled]
+		nest0_2 [label="Personalized Comfort Settings" color="#4285F4" fillcolor="#D0E0F8" shape=predefinedprocess style=filled]
+		nest0_3 [label="Child Monitoring" color="#4285F4" fillcolor="#D0E0F8" shape=preparation style=filled]
+	}
+	subgraph cluster_Remote Control {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Remote Control"
+		nest1_0 [label="Window Sensor Monitoring" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+		nest1_1 [label="Irrigation System Control" color="#4285F4" fillcolor="#D0E0F8" shape=action style=filled]
+		nest1_2 [label="Geofencing Trigger" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	}
+	N0 -> N1 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	N7 -> nest0_0 [color="#D3EB9F" penwidth=1.5 style=dashed label="opens" dir=forward]
+	nest0_3 -> N8 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest1_0 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N11 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S0 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N3 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N7 -> S1 [color="#4285F4" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#4285F4" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S2 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#8C9EFF" penwidth=1.5 style=solid dir=forward]
+	S2 -> N3 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#000000" penwidth=1.5 style=solid label="controls" dir=forward]
+	N5 -> M0 [color="#D3EB9F" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#8C9EFF" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#D3EB9F" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#8C9EFF" penwidth=1.5 style=dashed label="heats" dir=forward]
+	M2 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_7.txt b/test/diagrams/graph_hard/diagrams_7.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1efca6e79ebc3ebc95ecc6b32a2bede7b9a2d1e8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_7.txt
@@ -0,0 +1,30 @@
+<Automated Assembly, connectedTo, Shipping>
+<Batch Tracking, connectedTo, Inspection>
+<Design Review, connectedTo, Automated Assembly>
+<Design Review, connectedTo, Procurement>
+<Design Review, connectedTo, Shipping>
+<Design Review, connectedTo, Workflow Optimization>
+<Environmental Compliance, connectedTo, Quality Control>
+<Ergonomics Assessment, connectedTo, Serialization>
+<Factory Layout Planning, welds, Design Review>
+<Final Testing, connectedTo, Storage>
+<Inspection, connectedTo, Environmental Compliance>
+<Inventory Check, cleans, Batch Tracking>
+<Logistics Planning, connectedTo, Design Review>
+<Procurement, connectedTo, Shipping>
+<Procurement, connectedTo, Workflow Optimization>
+<Production Scheduling, connectedTo, Inventory Check>
+<Quality Control, connectedTo, Ergonomics Assessment>
+<Quality Control, connectedTo, Production Scheduling>
+<Quality Control, connectedTo, Serialization>
+<Quality Control, connectedTo, Tool Path Generation>
+<Shipping, connectedTo, Environmental Compliance>
+<Shipping, connectedTo, Serialization>
+<Storage, connectedTo, Factory Layout Planning>
+<Tool Path Generation, connectedTo, Ergonomics Assessment>
+<Tool Path Generation, connectedTo, Final Testing>
+<Tool Path Generation, connectedTo, Serialization>
+<Workflow Optimization, connectedTo, Automated Assembly>
+<Workflow Optimization, connectedTo, Environmental Compliance>
+<Workflow Optimization, connectedTo, Ergonomics Assessment>
+<Workflow Optimization, connectedTo, Serialization>
diff --git a/test/diagrams/graph_hard/diagrams_70.dot b/test/diagrams/graph_hard/diagrams_70.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f4ae4ae92c910a190c2dbb5a8912fe61150bfeb0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_70.dot
@@ -0,0 +1,57 @@
+digraph {
+	rankdir=LR
+	N0 [label="Urban Planning Data Analysis" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Data Privacy Protection" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N2 [label="Air Quality Index Reporting" color="#7986CB" fillcolor="#E8EAF6" shape=diamond style=filled]
+	N3 [label="City_wide Sensor Network Deployment" color="#CB9BE1" fillcolor="#F2E6F5" shape=multipledocuments style=filled]
+	N4 [label="Urban Agriculture Support" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+	N5 [label="Public Transport Tracking" color="#CB9BE1" fillcolor="#F2E6F5" shape=preparation style=filled]
+	N6 [label="Smart Water Meters" color="#FFF8A6" fillcolor="#FFFDE0" shape=rect style=filled]
+	N7 [label="Digital Kiosk Information" color="#7986CB" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#7986CB" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Citizen Engagement Platform {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Citizen Engagement Platform"
+		nest0_0 [label="Public Wi_Fi Deployment" color="#FFF8A6" fillcolor="#FFFDE0" shape=diamond style=filled]
+		nest0_1 [label="Smart Grid Security" color="#CB9BE1" fillcolor="#F2E6F5" shape=rect style=filled]
+		nest0_2 [label="Crowd Management" color="#7986CB" fillcolor="#E8EAF6" shape=preparation style=filled]
+		nest0_3 [label="Public Safety Monitoring" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	}
+	subgraph cluster_Smart Building Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Smart Building Integration"
+		nest1_0 [label="Intelligent Public Safety Cameras" color="#7986CB" fillcolor="#E8EAF6" shape=predefinedprocess style=filled]
+		nest1_1 [label="Noise Pollution Monitoring" color="#FFF8A6" fillcolor="#FFFDE0" shape=document style=filled]
+		nest1_2 [label="Emergency Response System" color="#CB9BE1" fillcolor="#F2E6F5" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#CB9BE1" penwidth=1.5 style=dashed label="protects" dir=forward]
+	N6 -> N7 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FFF8A6" penwidth=1.5 style=solid label="monitors" dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> nest0_3 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest0_0 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N2 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FFF8A6" penwidth=1.5 style=dashed label="builds" dir=forward]
+	nest1_1 -> nest1_2 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest1_0 [color="#FFF8A6" penwidth=1.5 style=solid label="innovates" dir=forward]
+	nest1_2 -> N4 [color="#CB9BE1" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N2 -> S2 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#CB9BE1" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	M0 -> N4 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_70.txt b/test/diagrams/graph_hard/diagrams_70.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8088fc31375daac2cf49db2152d81f738213ac89
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_70.txt
@@ -0,0 +1,23 @@
+<Air Quality Index Reporting, connectedTo, City_wide Sensor Network Deployment>
+<Air Quality Index Reporting, connectedTo, Public Transport Tracking>
+<Air Quality Index Reporting, connectedTo, Smart Water Meters>
+<Air Quality Index Reporting, connectedTo, Urban Agriculture Support>
+<City_wide Sensor Network Deployment, connectedTo, Public Transport Tracking>
+<City_wide Sensor Network Deployment, connectedTo, Smart Water Meters>
+<City_wide Sensor Network Deployment, connectedTo, Urban Agriculture Support>
+<Crowd Management, connectedTo, Public Safety Monitoring>
+<Data Privacy Protection, connectedTo, Air Quality Index Reporting>
+<Data Privacy Protection, connectedTo, Urban Agriculture Support>
+<Emergency Response System, connectedTo, Urban Agriculture Support>
+<Intelligent Public Safety Cameras, builds, Noise Pollution Monitoring>
+<Noise Pollution Monitoring, connectedTo, Emergency Response System>
+<Public Safety Monitoring, connectedTo, Air Quality Index Reporting>
+<Public Transport Tracking, protects, Smart Water Meters>
+<Public Wi_Fi Deployment, monitors, Smart Grid Security>
+<Smart Grid Security, connectedTo, Crowd Management>
+<Smart Water Meters, connectedTo, Digital Kiosk Information>
+<Urban Agriculture Support, connectedTo, Public Transport Tracking>
+<Urban Agriculture Support, connectedTo, Public Wi_Fi Deployment>
+<Urban Agriculture Support, innovates, Intelligent Public Safety Cameras>
+<Urban Planning Data Analysis, connectedTo, Data Privacy Protection>
+<Urban Planning Data Analysis, connectedTo, Urban Agriculture Support>
diff --git a/test/diagrams/graph_hard/diagrams_71.dot b/test/diagrams/graph_hard/diagrams_71.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8663163cd6fbe2989167be27f4de16045a18f98e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_71.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=BT
+	N0 [label="Smart Water Meters" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N1 [label="Traffic Flow Optimization" color="#FFE69C" fillcolor="#FFF9D4" shape=rectangle style=filled]
+	N2 [label="Data Privacy Protection" color="#FFE69C" fillcolor="#FFF9D4" shape=multipledocuments style=filled]
+	N3 [label="Citizen Feedback Loop" color="#FFE69C" fillcolor="#FFF9D4" shape=predefinedprocess style=filled]
+	N4 [label="Smart Parking" color="#FFA726" fillcolor="#FFF3E0" shape=inputoutput style=filled]
+	N5 [label="Sustainable Resource Management" color="#FFA726" fillcolor="#FFF3E0" shape=rectangle style=filled]
+	N6 [label="Digital Kiosk Information" color="#FFA726" fillcolor="#FFF3E0" shape=vnode_shape style=filled]
+	N7 [label="City_wide Sensor Network Deployment" color="#FFE69C" fillcolor="#FFF9D4" shape=rect style=filled]
+	N8 [label="Environmental Sensor Network" color="#E57373" fillcolor="#FFEBEE" shape=diamond style=filled]
+	N9 [label="Urban Mobility Solutions" color="#FFE69C" fillcolor="#FFF9D4" shape=multipledocuments style=filled]
+	N10 [label="Citizen Engagement Platform" color="#E57373" fillcolor="#FFEBEE" shape=vnode_shape style=filled]
+	N11 [label="Smart Building Integration" color="#E57373" fillcolor="#FFEBEE" shape=multipledocuments style=filled]
+	N12 [label="E_governance Services" color="#FFE69C" fillcolor="#FFF9D4" shape=predefinedprocess style=filled]
+	N13 [label="Water Management System" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N14 [label="Predictive Maintenance for Utilities" color="#E57373" fillcolor="#FFEBEE" shape=parallelogram style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFA726" fillcolor="#FFF3E0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFE69C" fillcolor="#FFF9D4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Renewable Energy Integration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Renewable Energy Integration"
+		nest0_0 [label="Emergency Response System" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+		nest0_1 [label="Waste Management Optimization" color="#FFE69C" fillcolor="#FFF9D4" shape=diamond style=filled]
+		nest0_2 [label="Urban Agriculture Support" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	}
+	subgraph cluster_Green Space Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Green Space Management"
+		nest1_0 [label="Cybersecurity for Infrastructure" color="#E57373" fillcolor="#FFEBEE" shape=multipledocuments style=filled]
+		nest1_1 [label="Public Transport Tracking" color="#E57373" fillcolor="#FFEBEE" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFA726" penwidth=1.5 style=dashed label="services" dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N10 -> nest0_0 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest1_0 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S0 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N3 -> S1 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N12 -> M0 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N9 -> M0 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	M0 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#000000" penwidth=1.5 style=solid label="plans" dir=forward]
+	M1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_71.txt b/test/diagrams/graph_hard/diagrams_71.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9ab6eee3ea02dc1abae48cd782bdb48e9ed734c0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_71.txt
@@ -0,0 +1,31 @@
+<Citizen Engagement Platform, connectedTo, Emergency Response System>
+<Citizen Engagement Platform, connectedTo, Smart Building Integration>
+<Citizen Feedback Loop, connectedTo, City_wide Sensor Network Deployment>
+<Citizen Feedback Loop, connectedTo, Smart Parking>
+<Citizen Feedback Loop, connectedTo, Water Management System>
+<City_wide Sensor Network Deployment, connectedTo, Environmental Sensor Network>
+<City_wide Sensor Network Deployment, connectedTo, Predictive Maintenance for Utilities>
+<City_wide Sensor Network Deployment, connectedTo, Smart Building Integration>
+<City_wide Sensor Network Deployment, connectedTo, Water Management System>
+<Cybersecurity for Infrastructure, connectedTo, Public Transport Tracking>
+<Data Privacy Protection, connectedTo, Citizen Feedback Loop>
+<Data Privacy Protection, connectedTo, City_wide Sensor Network Deployment>
+<Data Privacy Protection, connectedTo, Predictive Maintenance for Utilities>
+<Digital Kiosk Information, connectedTo, City_wide Sensor Network Deployment>
+<E_governance Services, connectedTo, Cybersecurity for Infrastructure>
+<E_governance Services, connectedTo, Predictive Maintenance for Utilities>
+<E_governance Services, connectedTo, Water Management System>
+<Emergency Response System, connectedTo, Waste Management Optimization>
+<Environmental Sensor Network, connectedTo, Urban Mobility Solutions>
+<Public Transport Tracking, connectedTo, Water Management System>
+<Smart Building Integration, connectedTo, E_governance Services>
+<Smart Parking, connectedTo, Sustainable Resource Management>
+<Smart Water Meters, connectedTo, Traffic Flow Optimization>
+<Sustainable Resource Management, connectedTo, Digital Kiosk Information>
+<Sustainable Resource Management, plans, City_wide Sensor Network Deployment>
+<Traffic Flow Optimization, connectedTo, Data Privacy Protection>
+<Urban Agriculture Support, connectedTo, Smart Parking>
+<Urban Mobility Solutions, connectedTo, Predictive Maintenance for Utilities>
+<Urban Mobility Solutions, services, Citizen Engagement Platform>
+<Waste Management Optimization, connectedTo, Urban Agriculture Support>
+<Water Management System, connectedTo, Predictive Maintenance for Utilities>
diff --git a/test/diagrams/graph_hard/diagrams_72.dot b/test/diagrams/graph_hard/diagrams_72.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0712702de2d30a9684c0489e5eb8a6afef51b519
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_72.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=RL
+	N0 [label="Public Wi_Fi Deployment" color="#66BB6A" fillcolor="#E8F5E9" shape=preparation style=filled]
+	N1 [label="Smart Grid Security" color="#66BB6A" fillcolor="#E8F5E9" shape=parallelogram style=filled]
+	N2 [label="Urban Mobility Solutions" color="#66BB6A" fillcolor="#E8F5E9" shape=document style=filled]
+	N3 [label="City_wide Sensor Network Deployment" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N4 [label="Citizen Engagement Platform" color="#FFDA4E" fillcolor="#FFE88D" shape=multipledocuments style=filled]
+	N5 [label="Urban Planning Data Analysis" color="#AABEC6" fillcolor="#E0E6E9" shape=parallelogram style=filled]
+	N6 [label="Data Privacy Protection" color="#66BB6A" fillcolor="#E8F5E9" shape=rect style=filled]
+	N7 [label="Disaster Resilience Planning" color="#AABEC6" fillcolor="#E0E6E9" shape=rectangle style=filled]
+	N8 [label="Intelligent Public Safety Cameras" color="#AABEC6" fillcolor="#E0E6E9" shape=vnode_shape style=filled]
+	N9 [label="Public Transport Tracking" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N10 [label="Smart Street Furniture" color="#AABEC6" fillcolor="#E0E6E9" shape=rect style=filled]
+	S0 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#66BB6A" fillcolor="#E8F5E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFDA4E" fillcolor="#FFE88D" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Sustainable Resource Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Sustainable Resource Management"
+		nest0_0 [label="Urban Agriculture Support" color="#FFDA4E" fillcolor="#FFE88D" shape=inputoutput style=filled]
+		nest0_1 [label="Infrastructure Maintenance Alert" color="#66BB6A" fillcolor="#E8F5E9" shape=multipledocuments style=filled]
+		nest0_2 [label="Traffic Flow Optimization" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+		nest0_3 [label="Waste Management Optimization" color="#FFDA4E" fillcolor="#FFE88D" shape=rect style=filled]
+	}
+	subgraph cluster_Smart Lighting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Smart Lighting"
+		nest1_0 [label="Smart Water Meters" color="#66BB6A" fillcolor="#E8F5E9" shape=inputoutput style=filled]
+		nest1_1 [label="Cybersecurity for Infrastructure" color="#66BB6A" fillcolor="#E8F5E9" shape=parallelogram style=filled]
+		nest1_2 [label="Noise Pollution Monitoring" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	}
+	N0 -> N1 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#AABEC6" penwidth=1.5 style=solid label="connects" dir=forward]
+	nest0_3 -> N9 [color="#66BB6A" penwidth=1.5 style=solid label="audits" dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> N9 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#66BB6A" penwidth=1.5 style=solid label="engages" dir=forward]
+	S0 -> N8 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S1 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#AABEC6" penwidth=1.5 style=solid label="partners" dir=forward]
+	N3 -> M0 [color="#FFDA4E" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N9 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#AABEC6" penwidth=1.5 style=dashed label="plans" dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#FFDA4E" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#66BB6A" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N7 [color="#66BB6A" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_72.txt b/test/diagrams/graph_hard/diagrams_72.txt
new file mode 100644
index 0000000000000000000000000000000000000000..17b619788b027ddf60e48d0175f9bfe7f20b1630
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_72.txt
@@ -0,0 +1,30 @@
+<Citizen Engagement Platform, connectedTo, Disaster Resilience Planning>
+<Citizen Engagement Platform, connectedTo, Intelligent Public Safety Cameras>
+<Citizen Engagement Platform, connectedTo, Urban Planning Data Analysis>
+<Citizen Engagement Platform, engages, Smart Street Furniture>
+<City_wide Sensor Network Deployment, connectedTo, Citizen Engagement Platform>
+<City_wide Sensor Network Deployment, connectedTo, Disaster Resilience Planning>
+<City_wide Sensor Network Deployment, connectedTo, Public Transport Tracking>
+<Cybersecurity for Infrastructure, connectedTo, Noise Pollution Monitoring>
+<Data Privacy Protection, connectedTo, Disaster Resilience Planning>
+<Data Privacy Protection, connectedTo, Intelligent Public Safety Cameras>
+<Data Privacy Protection, partners, Public Transport Tracking>
+<Disaster Resilience Planning, connectedTo, Intelligent Public Safety Cameras>
+<Infrastructure Maintenance Alert, connectedTo, Traffic Flow Optimization>
+<Intelligent Public Safety Cameras, connectedTo, Public Transport Tracking>
+<Noise Pollution Monitoring, connectedTo, Public Transport Tracking>
+<Public Transport Tracking, connectedTo, Smart Street Furniture>
+<Public Wi_Fi Deployment, connectedTo, Smart Grid Security>
+<Public Wi_Fi Deployment, plans, Disaster Resilience Planning>
+<Smart Grid Security, connectedTo, Disaster Resilience Planning>
+<Smart Grid Security, connectedTo, Public Transport Tracking>
+<Smart Grid Security, connectedTo, Smart Water Meters>
+<Smart Grid Security, connectedTo, Urban Mobility Solutions>
+<Smart Water Meters, connectedTo, Cybersecurity for Infrastructure>
+<Traffic Flow Optimization, connectedTo, Waste Management Optimization>
+<Urban Agriculture Support, connectedTo, Infrastructure Maintenance Alert>
+<Urban Mobility Solutions, connectedTo, City_wide Sensor Network Deployment>
+<Urban Mobility Solutions, connectedTo, Disaster Resilience Planning>
+<Urban Mobility Solutions, connects, Urban Agriculture Support>
+<Urban Planning Data Analysis, connectedTo, Data Privacy Protection>
+<Waste Management Optimization, audits, Public Transport Tracking>
diff --git a/test/diagrams/graph_hard/diagrams_73.dot b/test/diagrams/graph_hard/diagrams_73.dot
new file mode 100644
index 0000000000000000000000000000000000000000..057df27977705f34e6bcc1762493c0991a7cc059
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_73.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=RL
+	N0 [label="Drug Discovery" color="#4FC3F7" fillcolor="#E1F5FE" shape=rectangle style=filled]
+	N1 [label="Cell Culture" color="#4FC3F7" fillcolor="#E1F5FE" shape=document style=filled]
+	N2 [label="Gene Therapy Delivery" color="#FFC085" fillcolor="#FFDAB9" shape=inputoutput style=filled]
+	N3 [label="Target Identification" color="#FFC085" fillcolor="#FFDAB9" shape=inputoutput style=filled]
+	N4 [label="Intellectual Property Protection" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+	N5 [label="Biosafety Protocol" color="#FFF176" fillcolor="#FFFDE7" shape=multipledocuments style=filled]
+	N6 [label="Microbial Fermentation" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N7 [label="Clinical Data Interpretation" color="#FFC085" fillcolor="#FFDAB9" shape=vnode_shape style=filled]
+	N8 [label="Data Management and Analysis" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N9 [label="Environmental Bioremediation" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N10 [label="Clinical Trial Design" color="#4FC3F7" fillcolor="#E1F5FE" shape=multipledocuments style=filled]
+	S1 [label="" color="#4FC3F7" fillcolor="#E1F5FE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFF176" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFF176" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FFC085" fillcolor="#FFDAB9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_CRISPR Technology Application {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="CRISPR Technology Application"
+		nest0_0 [label="Assay Development" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+		nest0_1 [label="Pharmacogenomics" color="#FFF176" fillcolor="#FFFDE7" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Nanobiotechnology Application {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Nanobiotechnology Application"
+		nest1_0 [label="Biosensor Development" color="#FFC085" fillcolor="#FFDAB9" shape=inputoutput style=filled]
+		nest1_1 [label="Lab Automation" color="#FFF176" fillcolor="#FFFDE7" shape=predefinedprocess style=filled]
+		nest1_2 [label="Gene Sequencing" color="#4FC3F7" fillcolor="#E1F5FE" shape=inputoutput style=filled]
+		nest1_3 [label="Ethical Review Board Approval" color="#FFF176" fillcolor="#FFFDE7" shape=action style=filled]
+	}
+	N0 -> N1 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#4FC3F7" penwidth=1.5 style=solid label="models" dir=forward]
+	N5 -> nest1_0 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N7 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S2 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	S2 -> N9 [color="#000000" penwidth=1.5 style=dashed label="modifies" dir=forward]
+	S2 -> N5 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	M0 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> M1 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N8 [color="#FFF176" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#4FC3F7" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#FFF176" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N4 [color="#4FC3F7" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_73.txt b/test/diagrams/graph_hard/diagrams_73.txt
new file mode 100644
index 0000000000000000000000000000000000000000..116a5aa03df74eadec39e48dd3bc9159c03fbc11
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_73.txt
@@ -0,0 +1,27 @@
+<Assay Development, connectedTo, Pharmacogenomics>
+<Biosafety Protocol, connectedTo, Biosensor Development>
+<Biosafety Protocol, connectedTo, Clinical Trial Design>
+<Biosafety Protocol, connectedTo, Data Management and Analysis>
+<Biosafety Protocol, connectedTo, Microbial Fermentation>
+<Biosensor Development, connectedTo, Lab Automation>
+<Cell Culture, connectedTo, Data Management and Analysis>
+<Cell Culture, connectedTo, Gene Therapy Delivery>
+<Cell Culture, connectedTo, Intellectual Property Protection>
+<Clinical Data Interpretation, connectedTo, Assay Development>
+<Clinical Data Interpretation, connectedTo, Data Management and Analysis>
+<Data Management and Analysis, connectedTo, Environmental Bioremediation>
+<Drug Discovery, connectedTo, Cell Culture>
+<Drug Discovery, connectedTo, Intellectual Property Protection>
+<Environmental Bioremediation, connectedTo, Clinical Trial Design>
+<Ethical Review Board Approval, connectedTo, Clinical Data Interpretation>
+<Gene Sequencing, models, Ethical Review Board Approval>
+<Gene Therapy Delivery, connectedTo, Target Identification>
+<Intellectual Property Protection, connectedTo, Biosafety Protocol>
+<Lab Automation, connectedTo, Gene Sequencing>
+<Microbial Fermentation, connectedTo, Clinical Data Interpretation>
+<Microbial Fermentation, connectedTo, Data Management and Analysis>
+<Pharmacogenomics, connectedTo, Biosafety Protocol>
+<Target Identification, connectedTo, Biosafety Protocol>
+<Target Identification, connectedTo, Clinical Trial Design>
+<Target Identification, connectedTo, Intellectual Property Protection>
+<Target Identification, modifies, Environmental Bioremediation>
diff --git a/test/diagrams/graph_hard/diagrams_74.txt b/test/diagrams/graph_hard/diagrams_74.txt
new file mode 100644
index 0000000000000000000000000000000000000000..32d27e8b3314a897c04affbbb4a70f8019f372ca
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_74.txt
@@ -0,0 +1,30 @@
+<Biomanufacturing Scale_up, connectedTo, Data Management and Analysis>
+<Biomanufacturing Scale_up, connectedTo, Ethical Review Board Approval>
+<Biomanufacturing Scale_up, connectedTo, Gene Therapy Delivery>
+<Biomanufacturing Scale_up, connectedTo, Nanobiotechnology Application>
+<Biomanufacturing Scale_up, connectedTo, Pharmacogenomics>
+<Biomanufacturing Scale_up, connectedTo, Structural Biology>
+<Bioprocess Optimization, connectedTo, Regulatory Submission>
+<Cell Culture, connectedTo, Biomanufacturing Scale_up>
+<Clinical Data Interpretation, connectedTo, Data Management and Analysis>
+<Clinical Data Interpretation, connectedTo, Nanobiotechnology Application>
+<Clinical Data Interpretation, connectedTo, Protein Engineering>
+<Clinical Data Interpretation, connectedTo, Target Identification>
+<Computational Biology Modeling, connectedTo, Pharmacogenomics>
+<Computational Biology Modeling, connectedTo, Protein Engineering>
+<Data Management and Analysis, connectedTo, Drug Repurposing>
+<Data Management and Analysis, connectedTo, Structural Biology>
+<Data Management and Analysis, connectedTo, Target Identification>
+<Drug Repurposing, connectedTo, Intellectual Property Protection>
+<Gene Therapy Delivery, connectedTo, Clinical Data Interpretation>
+<Intellectual Property Protection, connectedTo, Protein Engineering>
+<Nanobiotechnology Application, connectedTo, Data Management and Analysis>
+<Personalized Medicine Formulation, connectedTo, Clinical Data Interpretation>
+<Pharmacogenomics, connectedTo, Structural Biology>
+<Protein Engineering, connectedTo, Pharmacogenomics>
+<Regulatory Submission, connectedTo, Personalized Medicine Formulation>
+<Structural Biology, connectedTo, Ethical Review Board Approval>
+<Target Identification, connectedTo, Computational Biology Modeling>
+<Target Identification, connectedTo, Pharmacogenomics>
+<Target Identification, connectedTo, Tissue Engineering>
+<Tissue Engineering, connectedTo, Bioprocess Optimization>
diff --git a/test/diagrams/graph_hard/diagrams_75.dot b/test/diagrams/graph_hard/diagrams_75.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f240c435109a8e8b01349ef5606470ef5ae4d43a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_75.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=TB
+	N0 [label="Clinical Trial Design" color="#F06292" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+	N1 [label="CRISPR Technology Application" color="#F7BEE0" fillcolor="#FAEBF3" shape=action style=filled]
+	N2 [label="Personalized Medicine Formulation" color="#F7BEE0" fillcolor="#FAEBF3" shape=rectangle style=filled]
+	N3 [label="Stem Cell Research" color="#F06292" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N4 [label="Computational Biology Modeling" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N5 [label="Drug Repurposing" color="#F7BEE0" fillcolor="#FAEBF3" shape=preparation style=filled]
+	N6 [label="Bioinformatics Analysis" color="#F7BEE0" fillcolor="#FAEBF3" shape=action style=filled]
+	N7 [label="Biomarker Discovery" color="#F06292" fillcolor="#FCE4EC" shape=diamond style=filled]
+	N8 [label="Cell Culture" color="#FFB74D" fillcolor="#FFF3E0" shape=multipledocuments style=filled]
+	N9 [label="Preclinical Testing" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N10 [label="Nanobiotechnology Application" color="#FFB74D" fillcolor="#FFF3E0" shape=database style=filled]
+	N11 [label="Intellectual Property Protection" color="#FFB74D" fillcolor="#FFF3E0" shape=rect style=filled]
+	N12 [label="Tissue Engineering" color="#FFB74D" fillcolor="#FFF3E0" shape=multipledocuments style=filled]
+	N13 [label="Clinical Data Interpretation" color="#F7BEE0" fillcolor="#FAEBF3" shape=predefinedprocess style=filled]
+	N14 [label="Vaccine Development" color="#FFB74D" fillcolor="#FFF3E0" shape=database style=filled]
+	N15 [label="Regulatory Submission" color="#F06292" fillcolor="#FCE4EC" shape=rectangle style=filled]
+	N16 [label="Biosafety Protocol" color="#F7BEE0" fillcolor="#FAEBF3" shape=rectangle style=filled]
+	N17 [label="Genomic Editing" color="#FFB74D" fillcolor="#FFF3E0" shape=action style=filled]
+	S0 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Ethical Review Board Approval {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Ethical Review Board Approval"
+		nest0_0 [label="Protein Engineering" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest0_1 [label="Data Management and Analysis" color="#F7BEE0" fillcolor="#FAEBF3" shape=rectangle style=filled]
+		nest0_2 [label="Lab Automation" color="#F7BEE0" fillcolor="#FAEBF3" shape=document style=filled]
+	}
+	subgraph cluster_Bioprocess Optimization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Bioprocess Optimization"
+		nest1_0 [label="Assay Development" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_1 [label="Bioimaging" color="#F7BEE0" fillcolor="#FAEBF3" shape=multipledocuments style=filled]
+		nest1_2 [label="Drug Discovery" color="#F06292" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFB74D" penwidth=1.5 style=solid label="commercializes" dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#F06292" penwidth=1.5 style=solid label="optimizes" dir=forward]
+	nest0_0 -> nest0_1 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N13 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FFB74D" penwidth=1.5 style=dashed label="detects" dir=forward]
+	nest1_1 -> nest1_2 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N11 -> nest1_0 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S0 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S1 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N15 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	S1 -> N17 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> M0 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N7 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_75.txt b/test/diagrams/graph_hard/diagrams_75.txt
new file mode 100644
index 0000000000000000000000000000000000000000..650b89598cf3d17db6ffd4cb1863320b9b285113
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_75.txt
@@ -0,0 +1,33 @@
+<Assay Development, detects, Bioimaging>
+<Bioimaging, connectedTo, Drug Discovery>
+<Bioinformatics Analysis, connectedTo, Biomarker Discovery>
+<Bioinformatics Analysis, connectedTo, Cell Culture>
+<Bioinformatics Analysis, connectedTo, Regulatory Submission>
+<Biomarker Discovery, connectedTo, Cell Culture>
+<Biomarker Discovery, connectedTo, Regulatory Submission>
+<Biosafety Protocol, optimizes, Genomic Editing>
+<CRISPR Technology Application, connectedTo, Personalized Medicine Formulation>
+<Cell Culture, commercializes, Preclinical Testing>
+<Clinical Data Interpretation, connectedTo, Vaccine Development>
+<Clinical Trial Design, connectedTo, CRISPR Technology Application>
+<Computational Biology Modeling, connectedTo, Biomarker Discovery>
+<Computational Biology Modeling, connectedTo, Drug Repurposing>
+<Data Management and Analysis, connectedTo, Lab Automation>
+<Drug Discovery, connectedTo, Nanobiotechnology Application>
+<Drug Repurposing, connectedTo, Bioinformatics Analysis>
+<Drug Repurposing, connectedTo, Genomic Editing>
+<Drug Repurposing, connectedTo, Regulatory Submission>
+<Intellectual Property Protection, connectedTo, Assay Development>
+<Intellectual Property Protection, connectedTo, Tissue Engineering>
+<Lab Automation, connectedTo, Clinical Data Interpretation>
+<Nanobiotechnology Application, connectedTo, Intellectual Property Protection>
+<Personalized Medicine Formulation, connectedTo, Biomarker Discovery>
+<Personalized Medicine Formulation, connectedTo, Protein Engineering>
+<Personalized Medicine Formulation, connectedTo, Stem Cell Research>
+<Preclinical Testing, connectedTo, Nanobiotechnology Application>
+<Protein Engineering, connectedTo, Data Management and Analysis>
+<Regulatory Submission, connectedTo, Biosafety Protocol>
+<Stem Cell Research, connectedTo, Biomarker Discovery>
+<Stem Cell Research, connectedTo, Computational Biology Modeling>
+<Tissue Engineering, connectedTo, Clinical Data Interpretation>
+<Vaccine Development, connectedTo, Regulatory Submission>
diff --git a/test/diagrams/graph_hard/diagrams_76.dot b/test/diagrams/graph_hard/diagrams_76.dot
new file mode 100644
index 0000000000000000000000000000000000000000..56db2c294a92ea7542b2896072851ab9f8601208
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_76.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=BT
+	N0 [label="Intellectual Property Litigation" color="#9FA9E1" fillcolor="#D6D9F0" shape=predefinedprocess style=filled]
+	N1 [label="Drug Device Combination" color="#82DAFF" fillcolor="#C8EDFF" shape=database style=filled]
+	N2 [label="Solid Dosage Formulation" color="#82DAFF" fillcolor="#C8EDFF" shape=predefinedprocess style=filled]
+	N3 [label="Post_Approval Commitment Tracking" color="#9FA9E1" fillcolor="#D6D9F0" shape=action style=filled]
+	N4 [label="Audit Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=parallelogram style=filled]
+	N5 [label="Adverse Event Reporting" color="#9FA9E1" fillcolor="#D6D9F0" shape=database style=filled]
+	N6 [label="Global Regulatory Affairs" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+	N7 [label="Batch Release" color="#F7BEE0" fillcolor="#FAEBF3" shape=document style=filled]
+	N8 [label="Pharmacovigilance" color="#F7BEE0" fillcolor="#FAEBF3" shape=diamond style=filled]
+	N9 [label="Drug Stability Testing" color="#F7BEE0" fillcolor="#FAEBF3" shape=diamond style=filled]
+	N10 [label="Formulation Development" color="#82DAFF" fillcolor="#C8EDFF" shape=parallelogram style=filled]
+	N11 [label="Cold Chain Logistics" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+	N12 [label="Counterfeit Drug Detection" color="#9FA9E1" fillcolor="#D6D9F0" shape=vnode_shape style=filled]
+	N13 [label="Regulatory Approval" color="#82DAFF" fillcolor="#C8EDFF" shape=rectangle style=filled]
+	S1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#82DAFF" fillcolor="#C8EDFF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Biostatistics {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Biostatistics"
+		nest0_0 [label="Quality Control" color="#F7BEE0" fillcolor="#FAEBF3" shape=document style=filled]
+		nest0_1 [label="Sales and Marketing Strategy" color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+		nest0_2 [label="Compound Synthesis" color="#9FA9E1" fillcolor="#D6D9F0" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Patent Application {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Patent Application"
+		nest1_0 [label="Supply Chain Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest1_1 [label="Injectable Drug Manufacturing" color="#F7BEE0" fillcolor="#FAEBF3" shape=inputoutput style=filled]
+		nest1_2 [label="Medical Writing" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+		nest1_3 [label="Distribution" color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#82DAFF" penwidth=1.5 style=solid label="monitors" dir=forward]
+	N5 -> N6 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#82DAFF" penwidth=1.5 style=dashed label="labels" dir=forward]
+	N12 -> N13 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#82DAFF" penwidth=1.5 style=solid label="distributes" dir=forward]
+	N4 -> nest1_0 [color="#F7BEE0" penwidth=1.5 style=dashed label="advises" dir=forward]
+	nest1_3 -> N10 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N10 -> S1 [color="#F7BEE0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#F7BEE0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N13 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#F7BEE0" penwidth=1.5 style=solid label="markets" dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#82DAFF" penwidth=1.5 style=solid dir=forward]
+	M1 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_76.txt b/test/diagrams/graph_hard/diagrams_76.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9a62f5b88aa365941b44ba1f4d030cae3359e2a4
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_76.txt
@@ -0,0 +1,31 @@
+<Adverse Event Reporting, connectedTo, Global Regulatory Affairs>
+<Audit Management, advises, Supply Chain Management>
+<Audit Management, connectedTo, Pharmacovigilance>
+<Audit Management, monitors, Adverse Event Reporting>
+<Batch Release, connectedTo, Pharmacovigilance>
+<Cold Chain Logistics, labels, Counterfeit Drug Detection>
+<Compound Synthesis, connectedTo, Formulation Development>
+<Compound Synthesis, partOf, Compound Synthesis>
+<Counterfeit Drug Detection, connectedTo, Regulatory Approval>
+<Distribution, connectedTo, Formulation Development>
+<Drug Device Combination, connectedTo, Pharmacovigilance>
+<Drug Device Combination, connectedTo, Post_Approval Commitment Tracking>
+<Drug Device Combination, connectedTo, Solid Dosage Formulation>
+<Drug Stability Testing, connectedTo, Formulation Development>
+<Formulation Development, connectedTo, Cold Chain Logistics>
+<Formulation Development, connectedTo, Counterfeit Drug Detection>
+<Formulation Development, connectedTo, Regulatory Approval>
+<Global Regulatory Affairs, connectedTo, Batch Release>
+<Global Regulatory Affairs, connectedTo, Quality Control>
+<Injectable Drug Manufacturing, connectedTo, Medical Writing>
+<Intellectual Property Litigation, connectedTo, Drug Device Combination>
+<Intellectual Property Litigation, markets, Post_Approval Commitment Tracking>
+<Medical Writing, distributes, Distribution>
+<Pharmacovigilance, connectedTo, Drug Stability Testing>
+<Post_Approval Commitment Tracking, connectedTo, Audit Management>
+<Quality Control, connectedTo, Sales and Marketing Strategy>
+<Quality Control, partOf, Quality Control>
+<Sales and Marketing Strategy, connectedTo, Compound Synthesis>
+<Sales and Marketing Strategy, partOf, Sales and Marketing Strategy>
+<Solid Dosage Formulation, connectedTo, Post_Approval Commitment Tracking>
+<Supply Chain Management, connectedTo, Injectable Drug Manufacturing>
diff --git a/test/diagrams/graph_hard/diagrams_77.dot b/test/diagrams/graph_hard/diagrams_77.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5c0517353df443575d739e54e5993f620acf489e
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_77.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=RL
+	N0 [label="Post_Approval Commitment Tracking" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+	N1 [label="Health Economics Outcomes Research" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N2 [label="Formulation Development" color="#E57373" fillcolor="#FFEBEE" shape=parallelogram style=filled]
+	N3 [label="Drug Repurposing" color="#AB47BC" fillcolor="#F3E5F5" shape=inputoutput style=filled]
+	N4 [label="Patient Adherence Programs" color="#9FA9E1" fillcolor="#D6D9F0" shape=database style=filled]
+	N5 [label="Patent Application" color="#E57373" fillcolor="#FFEBEE" shape=inputoutput style=filled]
+	N6 [label="Solid Dosage Formulation" color="#AB47BC" fillcolor="#F3E5F5" shape=multipledocuments style=filled]
+	N7 [label="Regulatory Approval" color="#AB47BC" fillcolor="#F3E5F5" shape=rect style=filled]
+	N8 [label="Compound Synthesis" color="#9FA9E1" fillcolor="#D6D9F0" shape=preparation style=filled]
+	N9 [label="Clinical Trial Phases" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N10 [label="Supply Chain Management" color="#E57373" fillcolor="#FFEBEE" shape=multipledocuments style=filled]
+	S1 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Pharmacovigilance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Pharmacovigilance"
+		nest0_0 [label="Clinical Data Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=action style=filled]
+		nest0_1 [label="Process Validation" color="#AB47BC" fillcolor="#F3E5F5" shape=database style=filled]
+	}
+	subgraph cluster_Audit Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Audit Management"
+		nest1_0 [label="Packaging" color="#AB47BC" fillcolor="#F3E5F5" shape=rect style=filled]
+		nest1_1 [label="Batch Release" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+		nest1_2 [label="Good Manufacturing Practices" color="#AB47BC" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+		nest1_3 [label="Intellectual Property Litigation" color="#AB47BC" fillcolor="#F3E5F5" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#9FA9E1" penwidth=1.5 style=solid label="tests" dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed label="formulates" dir=forward]
+	N9 -> N10 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest0_0 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#9FA9E1" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N5 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S1 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#E57373" penwidth=1.5 style=solid label="audits" dir=forward]
+	N2 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#9FA9E1" penwidth=1.5 style=dashed label="funds" dir=forward]
+	N5 -> M0 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#9FA9E1" penwidth=1.5 style=dashed label="certifies" dir=forward]
+	M0 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+	M1 -> N9 [color="#9FA9E1" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_78.dot b/test/diagrams/graph_hard/diagrams_78.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ff72d28e5481e7ec89d8f969f366796a02fe7ea2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_78.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=RL
+	N0 [label="Adverse Event Reporting" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N1 [label="Biostatistics" color="#90A4AE" fillcolor="#ECEFF1" shape=rectangle style=filled]
+	N2 [label="Patient Adherence Programs" color="#B8C0F5" fillcolor="#ECF0FD" shape=database style=filled]
+	N3 [label="Clinical Supply Management" color="#B8C0F5" fillcolor="#ECF0FD" shape=document style=filled]
+	N4 [label="Pharmacovigilance" color="#90A4AE" fillcolor="#ECEFF1" shape=multipledocuments style=filled]
+	N5 [label="Post_Approval Commitment Tracking" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N6 [label="Clinical Trial Phases" color="#B8C0F5" fillcolor="#ECF0FD" shape=rectangle style=filled]
+	N7 [label="Drug Repurposing" color="#FFF9AE" fillcolor="#FFFCE6" shape=parallelogram style=filled]
+	N8 [label="Packaging" color="#90A4AE" fillcolor="#ECEFF1" shape=rect style=filled]
+	N9 [label="Active Pharmaceutical Ingredient Production" color="#FFF9AE" fillcolor="#FFFCE6" shape=rectangle style=filled]
+	N10 [label="Post_Marketing Surveillance" color="#90A4AE" fillcolor="#ECEFF1" shape=rectangle style=filled]
+	N11 [label="Distribution" color="#B8C0F5" fillcolor="#ECF0FD" shape=multipledocuments style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Injectable Drug Manufacturing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Injectable Drug Manufacturing"
+		nest0_0 [label="Drug Research" color="#90A4AE" fillcolor="#ECEFF1" shape=action style=filled]
+		nest0_1 [label="Quality Control" color="#90A4AE" fillcolor="#ECEFF1" shape=preparation style=filled]
+		nest0_2 [label="Drug Device Combination" color="#FFF9AE" fillcolor="#FFFCE6" shape=database style=filled]
+		nest0_3 [label="Batch Release" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	}
+	subgraph cluster_Medical Writing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Medical Writing"
+		nest1_0 [label="Intellectual Property Litigation" color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+		nest1_1 [label="Drug Stability Testing" color="#90A4AE" fillcolor="#ECEFF1" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid label="sells" dir=forward]
+	N5 -> N6 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N8 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest1_0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N3 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N4 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N10 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N9 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N7 -> M1 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N9 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_78.txt b/test/diagrams/graph_hard/diagrams_78.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c70b9044d809d7112c87941a27a9e62998f0c655
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_78.txt
@@ -0,0 +1,30 @@
+<Active Pharmaceutical Ingredient Production, connectedTo, Intellectual Property Litigation>
+<Active Pharmaceutical Ingredient Production, connectedTo, Post_Marketing Surveillance>
+<Adverse Event Reporting, connectedTo, Active Pharmaceutical Ingredient Production>
+<Adverse Event Reporting, connectedTo, Biostatistics>
+<Adverse Event Reporting, connectedTo, Packaging>
+<Adverse Event Reporting, connectedTo, Pharmacovigilance>
+<Adverse Event Reporting, connectedTo, Post_Marketing Surveillance>
+<Batch Release, connectedTo, Packaging>
+<Biostatistics, connectedTo, Patient Adherence Programs>
+<Clinical Supply Management, connectedTo, Active Pharmaceutical Ingredient Production>
+<Clinical Supply Management, connectedTo, Distribution>
+<Clinical Supply Management, connectedTo, Pharmacovigilance>
+<Clinical Supply Management, connectedTo, Post_Approval Commitment Tracking>
+<Clinical Trial Phases, connectedTo, Drug Repurposing>
+<Clinical Trial Phases, connectedTo, Drug Research>
+<Drug Device Combination, connectedTo, Batch Release>
+<Drug Repurposing, connectedTo, Active Pharmaceutical Ingredient Production>
+<Drug Repurposing, connectedTo, Distribution>
+<Drug Repurposing, connectedTo, Packaging>
+<Drug Repurposing, connectedTo, Post_Marketing Surveillance>
+<Drug Research, connectedTo, Quality Control>
+<Drug Stability Testing, connectedTo, Clinical Supply Management>
+<Intellectual Property Litigation, connectedTo, Drug Stability Testing>
+<Packaging, connectedTo, Active Pharmaceutical Ingredient Production>
+<Patient Adherence Programs, connectedTo, Clinical Supply Management>
+<Pharmacovigilance, sells, Post_Approval Commitment Tracking>
+<Post_Approval Commitment Tracking, connectedTo, Active Pharmaceutical Ingredient Production>
+<Post_Approval Commitment Tracking, connectedTo, Clinical Trial Phases>
+<Post_Marketing Surveillance, connectedTo, Distribution>
+<Quality Control, connectedTo, Drug Device Combination>
diff --git a/test/diagrams/graph_hard/diagrams_79.dot b/test/diagrams/graph_hard/diagrams_79.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7bbdc14c51d7d059c45b6756a8fb482ea14cd703
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_79.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=RL
+	N0 [label="Embedded Systems Development" color="#B0C5CD" fillcolor="#DFE7EB" shape=multipledocuments style=filled]
+	N1 [label="System Integration" color="#CDDC39" fillcolor="#E6EE9C" shape=predefinedprocess style=filled]
+	N2 [label="Collaborative Robotics" color="#B0C5CD" fillcolor="#DFE7EB" shape=diamond style=filled]
+	N3 [label="Field Deployment" color="#B0C5CD" fillcolor="#DFE7EB" shape=action style=filled]
+	N4 [label="Learning Algorithms" color="#CDDC39" fillcolor="#E6EE9C" shape=predefinedprocess style=filled]
+	N5 [label="Performance Testing" color="#AF56A6" fillcolor="#DDCEDD" shape=vnode_shape style=filled]
+	N6 [label="Maintenance" color="#CDDC39" fillcolor="#E6EE9C" shape=action style=filled]
+	N7 [label="Calibration" color="#AF56A6" fillcolor="#DDCEDD" shape=predefinedprocess style=filled]
+	N8 [label="Robotics Simulation" color="#AF56A6" fillcolor="#DDCEDD" shape=parallelogram style=filled]
+	N9 [label="Service Robotics" color="#CDDC39" fillcolor="#E6EE9C" shape=database style=filled]
+	N10 [label="Robot Assembly" color="#AF56A6" fillcolor="#DDCEDD" shape=multipledocuments style=filled]
+	N11 [label="Drone Control" color="#AF56A6" fillcolor="#DDCEDD" shape=vnode_shape style=filled]
+	N12 [label="Swarm Robotics" color="#AF56A6" fillcolor="#DDCEDD" shape=document style=filled]
+	N13 [label="Sensor Integration" color="#AF56A6" fillcolor="#DDCEDD" shape=rectangle style=filled]
+	S0 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#CDDC39" fillcolor="#E6EE9C" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Grasping and Manipulation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Grasping and Manipulation"
+		nest0_0 [label="Artificial Intelligence Integration" color="#B0C5CD" fillcolor="#DFE7EB" shape=predefinedprocess style=filled]
+		nest0_1 [label="Kinematics and Dynamics" color="#B0C5CD" fillcolor="#DFE7EB" shape=rectangle style=filled]
+		nest0_2 [label="Battery Management" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+	}
+	subgraph cluster_Machine Vision {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Machine Vision"
+		nest1_0 [label="Software Development" color="#B0C5CD" fillcolor="#DFE7EB" shape=action style=filled]
+		nest1_1 [label="Robot Design" color="#CDDC39" fillcolor="#E6EE9C" shape=database style=filled]
+		nest1_2 [label="Robot Programming" color="#AF56A6" fillcolor="#DDCEDD" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#CDDC39" penwidth=1.5 style=dashed label="researches" dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#AF56A6" penwidth=1.5 style=dashed label="assists" dir=forward]
+	N9 -> N10 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#B0C5CD" penwidth=1.5 style=dashed label="models" dir=forward]
+	N11 -> N12 [color="#CDDC39" penwidth=1.5 style=dashed label="moves" dir=forward]
+	N12 -> N13 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N12 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest1_0 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N11 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S0 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S2 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	S2 -> N13 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	M1 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N3 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_79.txt b/test/diagrams/graph_hard/diagrams_79.txt
new file mode 100644
index 0000000000000000000000000000000000000000..00f18cc3e8dcbb7358cc9acce151bfa362785d6d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_79.txt
@@ -0,0 +1,32 @@
+<Artificial Intelligence Integration, connectedTo, Kinematics and Dynamics>
+<Battery Management, connectedTo, Swarm Robotics>
+<Calibration, connectedTo, Robotics Simulation>
+<Collaborative Robotics, connectedTo, Artificial Intelligence Integration>
+<Collaborative Robotics, connectedTo, Field Deployment>
+<Drone Control, moves, Swarm Robotics>
+<Embedded Systems Development, connectedTo, Field Deployment>
+<Embedded Systems Development, connectedTo, Performance Testing>
+<Embedded Systems Development, connectedTo, Service Robotics>
+<Embedded Systems Development, connectedTo, System Integration>
+<Field Deployment, connectedTo, Learning Algorithms>
+<Kinematics and Dynamics, connectedTo, Battery Management>
+<Learning Algorithms, connectedTo, Performance Testing>
+<Learning Algorithms, connectedTo, Service Robotics>
+<Maintenance, connectedTo, Calibration>
+<Performance Testing, connectedTo, Calibration>
+<Performance Testing, connectedTo, Robotics Simulation>
+<Performance Testing, researches, Maintenance>
+<Robot Assembly, models, Drone Control>
+<Robot Design, connectedTo, Robot Programming>
+<Robot Programming, connectedTo, Drone Control>
+<Robotics Simulation, assists, Service Robotics>
+<Robotics Simulation, connectedTo, Robot Assembly>
+<Robotics Simulation, connectedTo, Sensor Integration>
+<Robotics Simulation, connectedTo, Swarm Robotics>
+<Service Robotics, connectedTo, Robot Assembly>
+<Software Development, connectedTo, Robot Design>
+<Swarm Robotics, connectedTo, Sensor Integration>
+<System Integration, connectedTo, Collaborative Robotics>
+<System Integration, connectedTo, Field Deployment>
+<System Integration, connectedTo, Performance Testing>
+<System Integration, connectedTo, Software Development>
diff --git a/test/diagrams/graph_hard/diagrams_8.dot b/test/diagrams/graph_hard/diagrams_8.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1446a181defc824a9f9fb223fb33a035f26512d0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_8.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=BT
+	N0 [label="Supplier Qualification" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N1 [label="Automated Assembly" color="#D2D2D2" fillcolor="#F0F0F0" shape=vnode_shape style=filled]
+	N2 [label="Recycling Process" color="#D2D2D2" fillcolor="#F0F0F0" shape=multipledocuments style=filled]
+	N3 [label="Safety Audit" color="#AF56A6" fillcolor="#DDCEDD" shape=vnode_shape style=filled]
+	N4 [label="Final Testing" color="#AF56A6" fillcolor="#DDCEDD" shape=vnode_shape style=filled]
+	N5 [label="Quality Control" color="#AABEC6" fillcolor="#E0E6E9" shape=action style=filled]
+	N6 [label="Component Sourcing" color="#D2D2D2" fillcolor="#F0F0F0" shape=vnode_shape style=filled]
+	N7 [label="Parts Replacement" color="#D2D2D2" fillcolor="#F0F0F0" shape=preparation style=filled]
+	N8 [label="Batch Tracking" color="#AABEC6" fillcolor="#E0E6E9" shape=preparation style=filled]
+	N9 [label="Packaging" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N10 [label="Machine Calibration" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N11 [label="Production Scheduling" color="#D2D2D2" fillcolor="#F0F0F0" shape=rect style=filled]
+	N12 [label="Environmental Compliance" color="#AF56A6" fillcolor="#DDCEDD" shape=multipledocuments style=filled]
+	N13 [label="Factory Layout Planning" color="#D2D2D2" fillcolor="#F0F0F0" shape=inputoutput style=filled]
+	N14 [label="Welding" color="#AABEC6" fillcolor="#E0E6E9" shape=action style=filled]
+	N15 [label="Robotics Integration" color="#D2D2D2" fillcolor="#F0F0F0" shape=document style=filled]
+	N16 [label="Design Review" color="#AABEC6" fillcolor="#E0E6E9" shape=action style=filled]
+	N17 [label="Shipping" color="#AF56A6" fillcolor="#DDCEDD" shape=action style=filled]
+	S0 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#D2D2D2" fillcolor="#F0F0F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Serialization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Serialization"
+		nest0_0 [label="Automated Guided Vehicle Operation" color="#AABEC6" fillcolor="#E0E6E9" shape=multipledocuments style=filled]
+		nest0_1 [label="Product Design" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	}
+	subgraph cluster_Tool Path Generation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Tool Path Generation"
+		nest1_0 [label="Raw Material" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+		nest1_1 [label="Tool Setup" color="#D2D2D2" fillcolor="#F0F0F0" shape=database style=filled]
+	}
+	N0 -> N1 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#AF56A6" penwidth=1.5 style=dashed label="prototypes" dir=forward]
+	N9 -> N10 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#AF56A6" penwidth=1.5 style=dashed label="cuts" dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N3 [color="#AF56A6" penwidth=1.5 style=dashed label="processes" dir=forward]
+	nest1_0 -> nest1_1 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N15 -> nest1_0 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N17 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> S0 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N17 [color="#D2D2D2" penwidth=1.5 style=dashed label="schedules" dir=forward]
+	N4 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#AF56A6" penwidth=1.5 style=solid label="checks" dir=forward]
+	N6 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	M0 -> N9 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> M1 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N11 -> M1 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N14 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M2 [color="#AABEC6" penwidth=1.5 style=dashed label="mixes" dir=forward]
+	N5 -> M2 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	M2 -> N17 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_8.txt b/test/diagrams/graph_hard/diagrams_8.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4eb213c04e50c5418c1212a53f47739776f62aba
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_8.txt
@@ -0,0 +1,37 @@
+<Automated Assembly, connectedTo, Recycling Process>
+<Automated Guided Vehicle Operation, connectedTo, Product Design>
+<Automated Guided Vehicle Operation, partOf, Automated Guided Vehicle Operation>
+<Batch Tracking, prototypes, Packaging>
+<Component Sourcing, connectedTo, Automated Guided Vehicle Operation>
+<Component Sourcing, connectedTo, Packaging>
+<Component Sourcing, connectedTo, Parts Replacement>
+<Design Review, connectedTo, Shipping>
+<Environmental Compliance, connectedTo, Factory Layout Planning>
+<Environmental Compliance, connectedTo, Welding>
+<Factory Layout Planning, connectedTo, Welding>
+<Final Testing, checks, Packaging>
+<Final Testing, connectedTo, Parts Replacement>
+<Final Testing, connectedTo, Quality Control>
+<Final Testing, connectedTo, Robotics Integration>
+<Final Testing, mixes, Shipping>
+<Machine Calibration, connectedTo, Production Scheduling>
+<Packaging, connectedTo, Machine Calibration>
+<Parts Replacement, connectedTo, Batch Tracking>
+<Product Design, partOf, Product Design>
+<Product Design, processes, Safety Audit>
+<Production Scheduling, connectedTo, Environmental Compliance>
+<Production Scheduling, connectedTo, Welding>
+<Quality Control, connectedTo, Component Sourcing>
+<Quality Control, connectedTo, Shipping>
+<Raw Material, connectedTo, Tool Setup>
+<Recycling Process, connectedTo, Safety Audit>
+<Recycling Process, connectedTo, Welding>
+<Robotics Integration, connectedTo, Design Review>
+<Robotics Integration, connectedTo, Raw Material>
+<Safety Audit, connectedTo, Factory Layout Planning>
+<Safety Audit, connectedTo, Final Testing>
+<Safety Audit, schedules, Shipping>
+<Supplier Qualification, connectedTo, Automated Assembly>
+<Supplier Qualification, connectedTo, Packaging>
+<Tool Setup, connectedTo, Shipping>
+<Welding, cuts, Robotics Integration>
diff --git a/test/diagrams/graph_hard/diagrams_80.dot b/test/diagrams/graph_hard/diagrams_80.dot
new file mode 100644
index 0000000000000000000000000000000000000000..540a3b14eb4e38e220ae0762f326308049e7863c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_80.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=TB
+	N0 [label="Path Planning" color="#FFC2C2" fillcolor="#FFEBEB" shape=inputoutput style=filled]
+	N1 [label="Machine Vision" color="#FFC2C2" fillcolor="#FFEBEB" shape=rectangle style=filled]
+	N2 [label="Battery Management" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N3 [label="Maintenance" color="#6FE1D5" fillcolor="#C9EFEC" shape=parallelogram style=filled]
+	N4 [label="Software Development" color="#6FE1D5" fillcolor="#C9EFEC" shape=document style=filled]
+	N5 [label="Robot Assembly" color="#FFC2C2" fillcolor="#FFEBEB" shape=action style=filled]
+	N6 [label="Force Control" color="#9C27B0" fillcolor="#E1BEE7" shape=rect style=filled]
+	N7 [label="Service Robotics" color="#9C27B0" fillcolor="#E1BEE7" shape=inputoutput style=filled]
+	N8 [label="Performance Testing" color="#6FE1D5" fillcolor="#C9EFEC" shape=database style=filled]
+	N9 [label="Industrial Automation" color="#9C27B0" fillcolor="#E1BEE7" shape=rectangle style=filled]
+	N10 [label="Data Collection" color="#6FE1D5" fillcolor="#C9EFEC" shape=parallelogram style=filled]
+	N11 [label="Safety System Implementation" color="#FFC2C2" fillcolor="#FFEBEB" shape=vnode_shape style=filled]
+	S0 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Robotics Simulation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Robotics Simulation"
+		nest0_0 [label="Underwater Robotics" color="#9C27B0" fillcolor="#E1BEE7" shape=diamond style=filled]
+		nest0_1 [label="Sensor Integration" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+	}
+	subgraph cluster_Robot Fleet Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Robot Fleet Management"
+		nest1_0 [label="Swarm Robotics" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+		nest1_1 [label="End_Effector Design" color="#FFC2C2" fillcolor="#FFEBEB" shape=parallelogram style=filled]
+		nest1_2 [label="Robot Design" color="#6FE1D5" fillcolor="#C9EFEC" shape=diamond style=filled]
+		nest1_3 [label="Field Deployment" color="#9C27B0" fillcolor="#E1BEE7" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFC2C2" penwidth=1.5 style=dashed label="inspects" dir=forward]
+	N3 -> N4 [color="#9C27B0" penwidth=1.5 style=solid label="moves" dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid label="operates" dir=forward]
+	N6 -> N7 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFC2C2" penwidth=1.5 style=solid label="monitors" dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N7 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N8 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> nest1_3 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest1_0 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N2 [color="#FFC2C2" penwidth=1.5 style=solid dir=forward]
+	N2 -> S0 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N8 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#9C27B0" penwidth=1.5 style=solid label="collaborates" dir=forward]
+	N4 -> M0 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N9 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N6 -> M1 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N8 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+	N1 -> M2 [color="#6FE1D5" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#FFC2C2" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N3 [color="#6FE1D5" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_80.txt b/test/diagrams/graph_hard/diagrams_80.txt
new file mode 100644
index 0000000000000000000000000000000000000000..759d2f5d312e20e06597950a8f1c0887a51d3726
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_80.txt
@@ -0,0 +1,33 @@
+<Battery Management, connectedTo, Industrial Automation>
+<Battery Management, connectedTo, Performance Testing>
+<Battery Management, connectedTo, Safety System Implementation>
+<Battery Management, connectedTo, Service Robotics>
+<Battery Management, inspects, Maintenance>
+<Data Collection, connectedTo, Safety System Implementation>
+<End_Effector Design, connectedTo, Robot Design>
+<Field Deployment, connectedTo, Battery Management>
+<Force Control, connectedTo, Industrial Automation>
+<Force Control, connectedTo, Performance Testing>
+<Force Control, connectedTo, Service Robotics>
+<Force Control, connectedTo, Swarm Robotics>
+<Industrial Automation, connectedTo, Data Collection>
+<Machine Vision, connectedTo, Battery Management>
+<Machine Vision, connectedTo, Maintenance>
+<Machine Vision, connectedTo, Performance Testing>
+<Maintenance, connectedTo, Performance Testing>
+<Maintenance, moves, Software Development>
+<Path Planning, connectedTo, Industrial Automation>
+<Path Planning, connectedTo, Machine Vision>
+<Path Planning, connectedTo, Maintenance>
+<Performance Testing, connectedTo, Industrial Automation>
+<Robot Assembly, operates, Force Control>
+<Robot Design, connectedTo, Field Deployment>
+<Sensor Integration, connectedTo, Performance Testing>
+<Service Robotics, collaborates, Industrial Automation>
+<Service Robotics, connectedTo, Safety System Implementation>
+<Service Robotics, connectedTo, Underwater Robotics>
+<Service Robotics, monitors, Performance Testing>
+<Software Development, connectedTo, Industrial Automation>
+<Software Development, connectedTo, Robot Assembly>
+<Swarm Robotics, connectedTo, End_Effector Design>
+<Underwater Robotics, connectedTo, Sensor Integration>
diff --git a/test/diagrams/graph_hard/diagrams_81.dot b/test/diagrams/graph_hard/diagrams_81.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a6eb0e80e48b67cece68db2bc75522cde72dcfd6
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_81.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=RL
+	N0 [label="Safety System Implementation" color="#3F51B5" fillcolor="#C5CAE9" shape=inputoutput style=filled]
+	N1 [label="Service Robotics" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N2 [label="Battery Management" color="#AB47BC" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N3 [label="Industrial Automation" color="#AB47BC" fillcolor="#F3E5F5" shape=rectangle style=filled]
+	N4 [label="Machine Vision" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N5 [label="Maintenance" color="#3F51B5" fillcolor="#C5CAE9" shape=rectangle style=filled]
+	N6 [label="Path Planning" color="#AB47BC" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N7 [label="Robot Fleet Management" color="#BDBDBD" fillcolor="#F5F5F5" shape=preparation style=filled]
+	N8 [label="Sensor Integration" color="#AB47BC" fillcolor="#F3E5F5" shape=inputoutput style=filled]
+	N9 [label="Kinematics and Dynamics" color="#BDBDBD" fillcolor="#F5F5F5" shape=parallelogram style=filled]
+	N10 [label="Field Deployment" color="#3F51B5" fillcolor="#C5CAE9" shape=action style=filled]
+	N11 [label="Ethical Robotics Development" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N12 [label="Performance Testing" color="#3F51B5" fillcolor="#C5CAE9" shape=action style=filled]
+	N13 [label="Grasping and Manipulation" color="#3F51B5" fillcolor="#C5CAE9" shape=document style=filled]
+	N14 [label="Embedded Systems Development" color="#AB47BC" fillcolor="#F3E5F5" shape=predefinedprocess style=filled]
+	N15 [label="Robot Programming" color="#BDBDBD" fillcolor="#F5F5F5" shape=rectangle style=filled]
+	N16 [label="Agricultural Robotics" color="#3F51B5" fillcolor="#C5CAE9" shape=rect style=filled]
+	N17 [label="Data Collection" color="#3F51B5" fillcolor="#C5CAE9" shape=parallelogram style=filled]
+	S0 [label="" color="#BDBDBD" fillcolor="#F5F5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AB47BC" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#3F51B5" fillcolor="#C5CAE9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Robot Design {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Robot Design"
+		nest0_0 [label="Medical Robotics" color="#3F51B5" fillcolor="#C5CAE9" shape=diamond style=filled]
+		nest0_1 [label="Software Development" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+		nest0_2 [label="System Integration" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	}
+	subgraph cluster_Underwater Robotics {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Underwater Robotics"
+		nest1_0 [label="Artificial Intelligence Integration" color="#3F51B5" fillcolor="#C5CAE9" shape=parallelogram style=filled]
+		nest1_1 [label="Fault Detection and Diagnosis" color="#BDBDBD" fillcolor="#F5F5F5" shape=inputoutput style=filled]
+		nest1_2 [label="Collaborative Robotics" color="#3F51B5" fillcolor="#C5CAE9" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#BDBDBD" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#AB47BC" penwidth=1.5 style=solid label="detects" dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid label="models" dir=forward]
+	N13 -> N14 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N13 [color="#AB47BC" penwidth=1.5 style=solid label="integrates" dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest1_0 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N16 [color="#BDBDBD" penwidth=1.5 style=solid dir=forward]
+	N2 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#BDBDBD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S1 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#3F51B5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#BDBDBD" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N3 [color="#BDBDBD" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M2 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_81.txt b/test/diagrams/graph_hard/diagrams_81.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c0e55f3ebcdd3c5a9cd90bea1db65a3a541c4c29
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_81.txt
@@ -0,0 +1,33 @@
+<Agricultural Robotics, connectedTo, Data Collection>
+<Artificial Intelligence Integration, connectedTo, Fault Detection and Diagnosis>
+<Battery Management, connectedTo, Grasping and Manipulation>
+<Battery Management, connectedTo, Industrial Automation>
+<Battery Management, connectedTo, Robot Fleet Management>
+<Collaborative Robotics, connectedTo, Agricultural Robotics>
+<Embedded Systems Development, connectedTo, Robot Programming>
+<Ethical Robotics Development, detects, Performance Testing>
+<Fault Detection and Diagnosis, connectedTo, Collaborative Robotics>
+<Field Deployment, connectedTo, Ethical Robotics Development>
+<Grasping and Manipulation, connectedTo, Embedded Systems Development>
+<Industrial Automation, connectedTo, Artificial Intelligence Integration>
+<Industrial Automation, connectedTo, Kinematics and Dynamics>
+<Industrial Automation, connectedTo, Machine Vision>
+<Kinematics and Dynamics, connectedTo, Field Deployment>
+<Machine Vision, connectedTo, Maintenance>
+<Maintenance, connectedTo, Kinematics and Dynamics>
+<Maintenance, connectedTo, Path Planning>
+<Medical Robotics, connectedTo, Software Development>
+<Path Planning, connectedTo, Robot Fleet Management>
+<Performance Testing, models, Grasping and Manipulation>
+<Robot Fleet Management, connectedTo, Sensor Integration>
+<Robot Programming, connectedTo, Agricultural Robotics>
+<Safety System Implementation, connectedTo, Embedded Systems Development>
+<Safety System Implementation, connectedTo, Industrial Automation>
+<Safety System Implementation, connectedTo, Maintenance>
+<Safety System Implementation, connectedTo, Service Robotics>
+<Sensor Integration, connectedTo, Kinematics and Dynamics>
+<Service Robotics, connectedTo, Battery Management>
+<Service Robotics, connectedTo, Industrial Automation>
+<Service Robotics, connectedTo, Medical Robotics>
+<Software Development, connectedTo, System Integration>
+<System Integration, integrates, Grasping and Manipulation>
diff --git a/test/diagrams/graph_hard/diagrams_82.dot b/test/diagrams/graph_hard/diagrams_82.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4785df4543488b41b79642b9ea3932a65c55bd36
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_82.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=RL
+	N0 [label="Permit Application" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+	N1 [label="Roofing Installation" color="#FFC107" fillcolor="#FFECB3" shape=vnode_shape style=filled]
+	N2 [label="Material Procurement" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+	N3 [label="Site Decontamination" color="#C2B2F0" fillcolor="#EFE6FF" shape=multipledocuments style=filled]
+	N4 [label="Project Scheduling" color="#FFC107" fillcolor="#FFECB3" shape=vnode_shape style=filled]
+	N5 [label="Budget Tracking" color="#03A9F4" fillcolor="#B3E5FC" shape=rect style=filled]
+	N6 [label="Quality Assurance" color="#FFC107" fillcolor="#FFECB3" shape=diamond style=filled]
+	N7 [label="HVAC Installation" color="#C2B2F0" fillcolor="#EFE6FF" shape=inputoutput style=filled]
+	N8 [label="Safety Inspection" color="#C2B2F0" fillcolor="#EFE6FF" shape=diamond style=filled]
+	N9 [label="Blueprint Review" color="#C2B2F0" fillcolor="#EFE6FF" shape=action style=filled]
+	S0 [label="" color="#03A9F4" fillcolor="#B3E5FC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#03A9F4" fillcolor="#B3E5FC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#03A9F4" fillcolor="#B3E5FC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#03A9F4" fillcolor="#B3E5FC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFC107" fillcolor="#FFECB3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Change Order Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Change Order Management"
+		nest0_0 [label="Drone Surveying" color="#C2B2F0" fillcolor="#EFE6FF" shape=document style=filled]
+		nest0_1 [label="Site Logistics" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+		nest0_2 [label="Road Construction" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	}
+	subgraph cluster_Foundation Laying {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Foundation Laying"
+		nest1_0 [label="Occupancy Permit Acquisition" color="#03A9F4" fillcolor="#B3E5FC" shape=database style=filled]
+		nest1_1 [label="Steel Erection" color="#FFC107" fillcolor="#FFECB3" shape=database style=filled]
+		nest1_2 [label="Bridge Building" color="#C2B2F0" fillcolor="#EFE6FF" shape=vnode_shape style=filled]
+		nest1_3 [label="Demolition" color="#03A9F4" fillcolor="#B3E5FC" shape=predefinedprocess style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#C2B2F0" penwidth=1.5 style=dashed label="complies" dir=forward]
+	N4 -> N5 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest0_0 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest1_0 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N9 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N5 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	N5 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#FFC107" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S2 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N8 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	S2 -> N9 [color="#C2B2F0" penwidth=1.5 style=solid label="coordinates" dir=forward]
+	N1 -> M0 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#03A9F4" penwidth=1.5 style=solid label="frames" dir=forward]
+	M0 -> N4 [color="#FFC107" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#FFC107" penwidth=1.5 style=solid label="plans" dir=forward]
+	M1 -> N6 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_83.dot b/test/diagrams/graph_hard/diagrams_83.dot
new file mode 100644
index 0000000000000000000000000000000000000000..78c3a6f0f33c3e79f44d6e406399cdd34b60482d
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_83.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=TB
+	N0 [label="Drone Surveying" color="#4DB6AC" fillcolor="#E0F2F1" shape=rect style=filled]
+	N1 [label="Structural Framing" color="#AABEC6" fillcolor="#E0E6E9" shape=inputoutput style=filled]
+	N2 [label="Landscape Design" color="#4DB6AC" fillcolor="#E0F2F1" shape=inputoutput style=filled]
+	N3 [label="Robotics in Construction" color="#AABEC6" fillcolor="#E0E6E9" shape=database style=filled]
+	N4 [label="Electrical Wiring" color="#26A69A" fillcolor="#E0F2F1" shape=database style=filled]
+	N5 [label="Material Procurement" color="#4DB6AC" fillcolor="#E0F2F1" shape=database style=filled]
+	N6 [label="Permit Application" color="#4DB6AC" fillcolor="#E0F2F1" shape=predefinedprocess style=filled]
+	N7 [label="Quality Assurance" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N8 [label="Subcontractor Management" color="#4DB6AC" fillcolor="#E0F2F1" shape=predefinedprocess style=filled]
+	N9 [label="Roofing Installation" color="#26A69A" fillcolor="#E0F2F1" shape=predefinedprocess style=filled]
+	N10 [label="Bridge Building" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N11 [label="Equipment Mobilization" color="#26A69A" fillcolor="#E0F2F1" shape=diamond style=filled]
+	N12 [label="Budget Tracking" color="#26A69A" fillcolor="#E0F2F1" shape=rectangle style=filled]
+	N13 [label="Site Planning" color="#26A69A" fillcolor="#E0F2F1" shape=rect style=filled]
+	N14 [label="Punch List Completion" color="#26A69A" fillcolor="#E0F2F1" shape=predefinedprocess style=filled]
+	N15 [label="Project Scheduling" color="#26A69A" fillcolor="#E0F2F1" shape=action style=filled]
+	N16 [label="HVAC Installation" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N17 [label="Facade Installation" color="#26A69A" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N18 [label="Demolition" color="#26A69A" fillcolor="#E0F2F1" shape=document style=filled]
+	S0 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#26A69A" fillcolor="#E0F2F1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Change Order Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Change Order Management"
+		nest0_0 [label="Sustainable Building Design" color="#4DB6AC" fillcolor="#E0F2F1" shape=document style=filled]
+		nest0_1 [label="Occupancy Permit Acquisition" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+		nest0_2 [label="BIM Modeling" color="#4DB6AC" fillcolor="#E0F2F1" shape=preparation style=filled]
+	}
+	subgraph cluster_Interior Finishing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Interior Finishing"
+		nest1_0 [label="Excavation" color="#26A69A" fillcolor="#E0F2F1" shape=predefinedprocess style=filled]
+		nest1_1 [label="Tunneling" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest1_2 [label="Foundation Laying" color="#26A69A" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#4DB6AC" penwidth=1.5 style=solid label="grades" dir=forward]
+	N1 -> N2 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#AABEC6" penwidth=1.5 style=solid label="supervises" dir=forward]
+	N17 -> N18 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N9 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N13 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	S0 -> N18 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N11 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	N7 -> S1 [color="#26A69A" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	S1 -> N10 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#26A69A" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N5 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_83.txt b/test/diagrams/graph_hard/diagrams_83.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9810ca1690256b57c8b14c109ff4f3bd530c66fe
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_83.txt
@@ -0,0 +1,35 @@
+<BIM Modeling, connectedTo, Roofing Installation>
+<Bridge Building, connectedTo, Equipment Mobilization>
+<Budget Tracking, connectedTo, Site Planning>
+<Drone Surveying, connectedTo, Material Procurement>
+<Drone Surveying, grades, Structural Framing>
+<Electrical Wiring, connectedTo, Material Procurement>
+<Equipment Mobilization, connectedTo, Budget Tracking>
+<Excavation, connectedTo, Tunneling>
+<Facade Installation, connectedTo, Demolition>
+<Foundation Laying, connectedTo, Site Planning>
+<HVAC Installation, supervises, Facade Installation>
+<Landscape Design, connectedTo, Material Procurement>
+<Landscape Design, connectedTo, Robotics in Construction>
+<Material Procurement, connectedTo, Bridge Building>
+<Material Procurement, connectedTo, Demolition>
+<Material Procurement, connectedTo, Equipment Mobilization>
+<Material Procurement, connectedTo, Permit Application>
+<Occupancy Permit Acquisition, connectedTo, BIM Modeling>
+<Permit Application, connectedTo, Excavation>
+<Permit Application, connectedTo, Quality Assurance>
+<Permit Application, connectedTo, Sustainable Building Design>
+<Project Scheduling, connectedTo, HVAC Installation>
+<Punch List Completion, connectedTo, Project Scheduling>
+<Quality Assurance, connectedTo, Bridge Building>
+<Quality Assurance, connectedTo, Roofing Installation>
+<Quality Assurance, connectedTo, Subcontractor Management>
+<Robotics in Construction, connectedTo, Electrical Wiring>
+<Robotics in Construction, connectedTo, Material Procurement>
+<Roofing Installation, connectedTo, Bridge Building>
+<Site Planning, connectedTo, Punch List Completion>
+<Structural Framing, connectedTo, Landscape Design>
+<Structural Framing, connectedTo, Material Procurement>
+<Subcontractor Management, connectedTo, Roofing Installation>
+<Sustainable Building Design, connectedTo, Occupancy Permit Acquisition>
+<Tunneling, connectedTo, Foundation Laying>
diff --git a/test/diagrams/graph_hard/diagrams_84.dot b/test/diagrams/graph_hard/diagrams_84.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a8ed6b614ca0eeed9ebbefe9dbf4f7f1c7b6a00b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_84.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=BT
+	N0 [label="Change Order Management" color="#FFD54F" fillcolor="#FFF8E1" shape=preparation style=filled]
+	N1 [label="Interior Finishing" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N2 [label="Facade Installation" color="#FFD54F" fillcolor="#FFF8E1" shape=preparation style=filled]
+	N3 [label="Site Planning" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N4 [label="Structural Framing" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+	N5 [label="BIM Modeling" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N6 [label="Blueprint Review" color="#FFD54F" fillcolor="#FFF8E1" shape=diamond style=filled]
+	N7 [label="Utility Connection" color="#FFD54F" fillcolor="#FFF8E1" shape=rectangle style=filled]
+	N8 [label="Waste Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=database style=filled]
+	S0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#AB47BC" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFD54F" fillcolor="#FFF8E1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Punch List Completion {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Punch List Completion"
+		nest0_0 [label="Material Procurement" color="#AB47BC" fillcolor="#F3E5F5" shape=predefinedprocess style=filled]
+		nest0_1 [label="Drone Surveying" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+		nest0_2 [label="Electrical Wiring" color="#AB47BC" fillcolor="#F3E5F5" shape=database style=filled]
+	}
+	subgraph cluster_Sustainable Building Design {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Sustainable Building Design"
+		nest1_0 [label="Site Logistics" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+		nest1_1 [label="Landscape Design" color="#CD8FF2" fillcolor="#ECCFF5" shape=preparation style=filled]
+		nest1_2 [label="Quality Assurance" color="#FFD54F" fillcolor="#FFF8E1" shape=document style=filled]
+		nest1_3 [label="Permit Application" color="#FFD54F" fillcolor="#FFF8E1" shape=rect style=filled]
+	}
+	N0 -> N1 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#AB47BC" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#AB47BC" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest0_0 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N6 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N2 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N3 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N1 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#FFD54F" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N5 [color="#FFD54F" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_84.txt b/test/diagrams/graph_hard/diagrams_84.txt
new file mode 100644
index 0000000000000000000000000000000000000000..edcc2a17c82b1384303a34fbc0981c02c37aae9b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_84.txt
@@ -0,0 +1,25 @@
+<BIM Modeling, connectedTo, Blueprint Review>
+<BIM Modeling, connectedTo, Material Procurement>
+<Blueprint Review, connectedTo, Utility Connection>
+<Change Order Management, connectedTo, BIM Modeling>
+<Change Order Management, connectedTo, Interior Finishing>
+<Drone Surveying, connectedTo, Electrical Wiring>
+<Electrical Wiring, connectedTo, Blueprint Review>
+<Facade Installation, connectedTo, BIM Modeling>
+<Facade Installation, connectedTo, Blueprint Review>
+<Facade Installation, connectedTo, Site Logistics>
+<Facade Installation, connectedTo, Site Planning>
+<Facade Installation, connectedTo, Structural Framing>
+<Facade Installation, connectedTo, Utility Connection>
+<Interior Finishing, connectedTo, Facade Installation>
+<Interior Finishing, connectedTo, Utility Connection>
+<Interior Finishing, connectedTo, Waste Management>
+<Landscape Design, connectedTo, Quality Assurance>
+<Material Procurement, connectedTo, Drone Surveying>
+<Permit Application, connectedTo, Site Planning>
+<Quality Assurance, connectedTo, Permit Application>
+<Site Logistics, connectedTo, Landscape Design>
+<Site Planning, connectedTo, BIM Modeling>
+<Site Planning, connectedTo, Structural Framing>
+<Structural Framing, connectedTo, BIM Modeling>
+<Utility Connection, connectedTo, Waste Management>
diff --git a/test/diagrams/graph_hard/diagrams_85.txt b/test/diagrams/graph_hard/diagrams_85.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8b1de9dc0188a04490d0d55c995ec268718d3e39
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_85.txt
@@ -0,0 +1,24 @@
+<Analytics Reporting, connectedTo, Editing>
+<Analytics Reporting, connectedTo, Sound Design>
+<Audience Engagement, connectedTo, Content Creation>
+<Audience Engagement, connectedTo, Digital Marketing>
+<Broadcasting, connectedTo, Audience Engagement>
+<Broadcasting, connectedTo, Content Creation>
+<Content Creation, connectedTo, Analytics Reporting>
+<Content Creation, connectedTo, Platform Development>
+<Content Creation, connectedTo, Sound Design>
+<Crisis Communication, connectedTo, Subscription Management>
+<Digital Marketing, connectedTo, Event Organization>
+<Editing, connectedTo, Crisis Communication>
+<Event Organization, connectedTo, Audience Engagement>
+<Event Organization, connectedTo, Social Media Management>
+<Interactive Storytelling, connectedTo, Talent Management>
+<Photojournalism, narrates, Radio Programming>
+<Platform Development, connectedTo, Digital Marketing>
+<Platform Development, writes, Analytics Reporting>
+<Radio Programming, connectedTo, Audience Engagement>
+<Radio Programming, connectedTo, Platform Development>
+<Radio Programming, connectedTo, Sound Design>
+<Social Media Management, connectedTo, Broadcasting>
+<Subscription Management, connectedTo, Photojournalism>
+<Talent Management, connectedTo, Radio Programming>
diff --git a/test/diagrams/graph_hard/diagrams_86.dot b/test/diagrams/graph_hard/diagrams_86.dot
new file mode 100644
index 0000000000000000000000000000000000000000..90bc3421ce101bb848cd10453fc71c6a152688ee
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_86.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=BT
+	N0 [label="Data Monetization" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+	N1 [label="Audience Segmentation" color="#388E3C" fillcolor="#F1F8E9" shape=preparation style=filled]
+	N2 [label="Film Production" color="#BA68C8" fillcolor="#F3E5F5" shape=vnode_shape style=filled]
+	N3 [label="Sound Design" color="#388E3C" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N4 [label="Subscription Management" color="#BA68C8" fillcolor="#F3E5F5" shape=inputoutput style=filled]
+	N5 [label="User Generated Content Curation" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N6 [label="Scriptwriting" color="#BA68C8" fillcolor="#F3E5F5" shape=vnode_shape style=filled]
+	S0 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Analytics Reporting {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Analytics Reporting"
+		nest0_0 [label="Music Recording" color="#BA68C8" fillcolor="#F3E5F5" shape=rectangle style=filled]
+		nest0_1 [label="Podcast Production" color="#388E3C" fillcolor="#F1F8E9" shape=predefinedprocess style=filled]
+		nest0_2 [label="Audience Engagement" color="#9575CD" fillcolor="#EDE7F6" shape=rect style=filled]
+		nest0_3 [label="Editing" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	}
+	subgraph cluster_Crisis Communication {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Crisis Communication"
+		nest1_0 [label="Broadcasting" color="#9575CD" fillcolor="#EDE7F6" shape=inputoutput style=filled]
+		nest1_1 [label="Talent Management" color="#BA68C8" fillcolor="#F3E5F5" shape=rect style=filled]
+		nest1_2 [label="Augmented Reality Experiences" color="#388E3C" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+		nest1_3 [label="Brand Partnerships" color="#BA68C8" fillcolor="#F3E5F5" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#9575CD" penwidth=1.5 style=solid label="streams" dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#9575CD" penwidth=1.5 style=solid label="secures" dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#388E3C" penwidth=1.5 style=dashed label="researches" dir=forward]
+	N1 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N3 [color="#BA68C8" penwidth=1.5 style=solid label="curates" dir=forward]
+	N0 -> S0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	S0 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N4 [color="#BA68C8" penwidth=1.5 style=solid label="broadcasts" dir=forward]
+	N2 -> S1 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S1 -> N4 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	S1 -> N5 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N1 -> S2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N6 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N3 [color="#BA68C8" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N5 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N4 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N6 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_86.txt b/test/diagrams/graph_hard/diagrams_86.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cceef4a1916f9db7d9ef51fde3f1b09585e7fba7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_86.txt
@@ -0,0 +1,26 @@
+<Audience Engagement, researches, Editing>
+<Audience Segmentation, connectedTo, Music Recording>
+<Audience Segmentation, connectedTo, Scriptwriting>
+<Audience Segmentation, connectedTo, Sound Design>
+<Audience Segmentation, connectedTo, User Generated Content Curation>
+<Audience Segmentation, streams, Film Production>
+<Augmented Reality Experiences, connectedTo, Brand Partnerships>
+<Brand Partnerships, curates, Sound Design>
+<Broadcasting, connectedTo, Talent Management>
+<Data Monetization, broadcasts, Subscription Management>
+<Data Monetization, connectedTo, Audience Segmentation>
+<Data Monetization, connectedTo, Scriptwriting>
+<Data Monetization, connectedTo, Sound Design>
+<Editing, connectedTo, Sound Design>
+<Film Production, connectedTo, Scriptwriting>
+<Film Production, connectedTo, Sound Design>
+<Film Production, connectedTo, Subscription Management>
+<Film Production, connectedTo, User Generated Content Curation>
+<Music Recording, connectedTo, Podcast Production>
+<Podcast Production, connectedTo, Audience Engagement>
+<Sound Design, connectedTo, Subscription Management>
+<Subscription Management, connectedTo, Broadcasting>
+<Subscription Management, connectedTo, Scriptwriting>
+<Subscription Management, secures, User Generated Content Curation>
+<Talent Management, connectedTo, Augmented Reality Experiences>
+<User Generated Content Curation, connectedTo, Scriptwriting>
diff --git a/test/diagrams/graph_hard/diagrams_87.dot b/test/diagrams/graph_hard/diagrams_87.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9412619326df510e175cfeee00c16dc509dd1f72
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_87.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=TB
+	N0 [label="Media Consumption Trends Analysis" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N1 [label="Audience Engagement" color="#F06292" fillcolor="#FCE4EC" shape=rect style=filled]
+	N2 [label="Crisis Communication" color="#B0C5CD" fillcolor="#DFE7EB" shape=multipledocuments style=filled]
+	N3 [label="User Generated Content Curation" color="#B0C5CD" fillcolor="#DFE7EB" shape=preparation style=filled]
+	N4 [label="Radio Programming" color="#7E57C2" fillcolor="#D1C4E9" shape=document style=filled]
+	N5 [label="Cross_Platform Syndication" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N6 [label="Talent Management" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N7 [label="Audience Segmentation" color="#B0C5CD" fillcolor="#DFE7EB" shape=vnode_shape style=filled]
+	N8 [label="Film Production" color="#7E57C2" fillcolor="#D1C4E9" shape=action style=filled]
+	N9 [label="Photojournalism" color="#B0C5CD" fillcolor="#DFE7EB" shape=multipledocuments style=filled]
+	N10 [label="Brand Partnerships" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N11 [label="Augmented Reality Experiences" color="#F06292" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+	N12 [label="Broadcasting" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+	N13 [label="Content Licensing" color="#F06292" fillcolor="#FCE4EC" shape=action style=filled]
+	S0 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#7E57C2" fillcolor="#D1C4E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Publishing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Publishing"
+		nest0_0 [label="Interactive Storytelling" color="#B0C5CD" fillcolor="#DFE7EB" shape=document style=filled]
+		nest0_1 [label="Game Streaming" color="#F06292" fillcolor="#FCE4EC" shape=rect style=filled]
+	}
+	subgraph cluster_Content Moderation {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Content Moderation"
+		nest1_0 [label="Podcast Production" color="#F06292" fillcolor="#FCE4EC" shape=document style=filled]
+		nest1_1 [label="Digital Marketing" color="#7E57C2" fillcolor="#D1C4E9" shape=action style=filled]
+	}
+	N0 -> N1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#F06292" penwidth=1.5 style=dashed label="secures" dir=forward]
+	nest0_0 -> nest0_1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N1 -> nest0_0 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N12 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N5 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#B0C5CD" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N10 -> S2 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N13 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#B0C5CD" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N5 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N6 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> M2 [color="#000000" penwidth=1.5 style=solid label="records" dir=forward]
+	M2 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_87.txt b/test/diagrams/graph_hard/diagrams_87.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1a214a8d6ea34e727215645804fc63959fd105b0
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_87.txt
@@ -0,0 +1,32 @@
+<Audience Engagement, connectedTo, Crisis Communication>
+<Audience Engagement, connectedTo, Cross_Platform Syndication>
+<Audience Engagement, connectedTo, Interactive Storytelling>
+<Audience Segmentation, connectedTo, Film Production>
+<Audience Segmentation, records, Content Licensing>
+<Augmented Reality Experiences, connectedTo, Broadcasting>
+<Brand Partnerships, connectedTo, Augmented Reality Experiences>
+<Brand Partnerships, connectedTo, Broadcasting>
+<Brand Partnerships, connectedTo, Content Licensing>
+<Broadcasting, secures, Content Licensing>
+<Crisis Communication, connectedTo, Talent Management>
+<Crisis Communication, connectedTo, User Generated Content Curation>
+<Cross_Platform Syndication, connectedTo, Podcast Production>
+<Cross_Platform Syndication, connectedTo, Talent Management>
+<Digital Marketing, connectedTo, Broadcasting>
+<Film Production, connectedTo, Photojournalism>
+<Game Streaming, connectedTo, Cross_Platform Syndication>
+<Game Streaming, partOf, Game Streaming>
+<Interactive Storytelling, connectedTo, Game Streaming>
+<Interactive Storytelling, partOf, Interactive Storytelling>
+<Media Consumption Trends Analysis, connectedTo, Audience Engagement>
+<Media Consumption Trends Analysis, connectedTo, Cross_Platform Syndication>
+<Media Consumption Trends Analysis, connectedTo, Talent Management>
+<Photojournalism, connectedTo, Brand Partnerships>
+<Podcast Production, connectedTo, Digital Marketing>
+<Radio Programming, connectedTo, Content Licensing>
+<Radio Programming, connectedTo, Cross_Platform Syndication>
+<Radio Programming, connectedTo, Talent Management>
+<Talent Management, connectedTo, Audience Segmentation>
+<User Generated Content Curation, connectedTo, Cross_Platform Syndication>
+<User Generated Content Curation, connectedTo, Radio Programming>
+<User Generated Content Curation, connectedTo, Talent Management>
diff --git a/test/diagrams/graph_hard/diagrams_88.dot b/test/diagrams/graph_hard/diagrams_88.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7c3cce3001a3f2e0b6b641ab84b6efc92dfbc65b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_88.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=RL
+	N0 [label="Branding and Marketing" color="#A188D0" fillcolor="#DACBE3" shape=parallelogram style=filled]
+	N1 [label="Waste Reduction" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N2 [label="Catering Operations" color="#7986CB" fillcolor="#E8EAF6" shape=predefinedprocess style=filled]
+	N3 [label="Ingredient Traceability" color="#FFA726" fillcolor="#FFF3E0" shape=vnode_shape style=filled]
+	N4 [label="New Product Launch" color="#7986CB" fillcolor="#E8EAF6" shape=action style=filled]
+	N5 [label="Brewing" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N6 [label="Food Safety Inspection" color="#A188D0" fillcolor="#DACBE3" shape=vnode_shape style=filled]
+	N7 [label="Dietary Requirement Accommodation" color="#FFA726" fillcolor="#FFF3E0" shape=predefinedprocess style=filled]
+	N8 [label="Customer Order Taking" color="#FFA726" fillcolor="#FFF3E0" shape=action style=filled]
+	N9 [label="Food Packaging Design" color="#7986CB" fillcolor="#E8EAF6" shape=document style=filled]
+	S0 [label="" color="#7986CB" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#7986CB" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#7986CB" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#A188D0" fillcolor="#DACBE3" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Supply Chain Traceability {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Supply Chain Traceability"
+		nest0_0 [label="Inventory Management" color="#FFA726" fillcolor="#FFF3E0" shape=preparation style=filled]
+		nest0_1 [label="Sustainable Sourcing" color="#FFA726" fillcolor="#FFF3E0" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_Distribution {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Distribution"
+		nest1_0 [label="Menu Planning" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+		nest1_1 [label="Product Shelf_Life Testing" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#A188D0" penwidth=1.5 style=dashed label="develops" dir=forward]
+	N2 -> N3 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	N6 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#7986CB" penwidth=1.5 style=dashed label="manufactures" dir=forward]
+	N6 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S0 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> S2 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	S2 -> N7 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N8 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#A188D0" penwidth=1.5 style=solid label="stores" dir=forward]
+	N0 -> M0 [color="#7986CB" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N4 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M2 [color="#7986CB" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#FFA726" penwidth=1.5 style=solid dir=forward]
+	M2 -> N5 [color="#FFA726" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_88.txt b/test/diagrams/graph_hard/diagrams_88.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cc72c98cc593f698ebec8806f7dca6e05b168555
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_88.txt
@@ -0,0 +1,29 @@
+<Branding and Marketing, connectedTo, New Product Launch>
+<Branding and Marketing, connectedTo, Waste Reduction>
+<Brewing, connectedTo, Customer Order Taking>
+<Brewing, connectedTo, Dietary Requirement Accommodation>
+<Brewing, connectedTo, Food Packaging Design>
+<Brewing, connectedTo, Food Safety Inspection>
+<Catering Operations, connectedTo, Brewing>
+<Catering Operations, connectedTo, Ingredient Traceability>
+<Catering Operations, stores, New Product Launch>
+<Customer Order Taking, connectedTo, Food Packaging Design>
+<Dietary Requirement Accommodation, connectedTo, Customer Order Taking>
+<Food Safety Inspection, connectedTo, Dietary Requirement Accommodation>
+<Food Safety Inspection, connectedTo, Inventory Management>
+<Food Safety Inspection, connectedTo, Menu Planning>
+<Ingredient Traceability, connectedTo, Brewing>
+<Ingredient Traceability, connectedTo, Customer Order Taking>
+<Ingredient Traceability, connectedTo, Dietary Requirement Accommodation>
+<Ingredient Traceability, connectedTo, Food Packaging Design>
+<Ingredient Traceability, connectedTo, New Product Launch>
+<Inventory Management, connectedTo, Sustainable Sourcing>
+<Menu Planning, manufactures, Product Shelf_Life Testing>
+<Menu Planning, partOf, Menu Planning>
+<New Product Launch, connectedTo, Brewing>
+<Product Shelf_Life Testing, connectedTo, Customer Order Taking>
+<Product Shelf_Life Testing, partOf, Product Shelf_Life Testing>
+<Sustainable Sourcing, connectedTo, Customer Order Taking>
+<Waste Reduction, connectedTo, Brewing>
+<Waste Reduction, connectedTo, New Product Launch>
+<Waste Reduction, develops, Catering Operations>
diff --git a/test/diagrams/graph_hard/diagrams_89.dot b/test/diagrams/graph_hard/diagrams_89.dot
new file mode 100644
index 0000000000000000000000000000000000000000..27fe2bfbbc26b79d86f5eb7a38709c59be6e0a99
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_89.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=RL
+	N0 [label="Food Processing Automation" color="#FBC02D" fillcolor="#FFFDE7" shape=vnode_shape style=filled]
+	N1 [label="Distribution" color="#FBC02D" fillcolor="#FFFDE7" shape=inputoutput style=filled]
+	N2 [label="Cooking" color="#EAEFA5" fillcolor="#FDFCEB" shape=inputoutput style=filled]
+	N3 [label="Food Preparation" color="#FBC02D" fillcolor="#FFFDE7" shape=preparation style=filled]
+	N4 [label="Product Shelf_Life Testing" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N5 [label="Restaurant Reservation System" color="#FBC02D" fillcolor="#FFFDE7" shape=rect style=filled]
+	N6 [label="Branding and Marketing" color="#7E57C2" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	N7 [label="Kitchen Hygiene" color="#7E57C2" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N8 [label="Food Preservation" color="#EAEFA5" fillcolor="#FDFCEB" shape=parallelogram style=filled]
+	N9 [label="Packaging" color="#EAEFA5" fillcolor="#FDFCEB" shape=parallelogram style=filled]
+	N10 [label="Supply Chain Traceability" color="#FBC02D" fillcolor="#FFFDE7" shape=document style=filled]
+	N11 [label="Ingredient Traceability" color="#FBC02D" fillcolor="#FFFDE7" shape=predefinedprocess style=filled]
+	N12 [label="Sensory Evaluation" color="#EAEFA5" fillcolor="#FDFCEB" shape=hexagon style=filled]
+	N13 [label="Inventory Management" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	S0 [label="" color="#FBC02D" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#7E57C2" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Supplier Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Supplier Management"
+		nest0_0 [label="Restaurant Management" color="#EAEFA5" fillcolor="#FDFCEB" shape=inputoutput style=filled]
+		nest0_1 [label="Menu Planning" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+		nest0_2 [label="Consumer Feedback Collection" color="#7E57C2" fillcolor="#EDE7F6" shape=predefinedprocess style=filled]
+	}
+	subgraph cluster_New Product Launch {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="New Product Launch"
+		nest1_0 [label="Service Delivery" color="#EAEFA5" fillcolor="#FDFCEB" shape=rect style=filled]
+		nest1_1 [label="Storage Solutions" color="#FBC02D" fillcolor="#FFFDE7" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#EAEFA5" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N1 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N12 -> nest1_0 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N5 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N0 -> S0 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> S1 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#EAEFA5" penwidth=1.5 style=solid dir=forward]
+	M0 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N5 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_89.txt b/test/diagrams/graph_hard/diagrams_89.txt
new file mode 100644
index 0000000000000000000000000000000000000000..99ce14cbe46c83716393ae5e79dcf0f89b794385
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_89.txt
@@ -0,0 +1,28 @@
+<Branding and Marketing, connectedTo, Kitchen Hygiene>
+<Consumer Feedback Collection, connectedTo, Distribution>
+<Cooking, connectedTo, Food Preparation>
+<Cooking, connectedTo, Product Shelf_Life Testing>
+<Distribution, connectedTo, Cooking>
+<Distribution, connectedTo, Restaurant Reservation System>
+<Food Preparation, connectedTo, Product Shelf_Life Testing>
+<Food Preparation, connectedTo, Restaurant Management>
+<Food Preservation, connectedTo, Ingredient Traceability>
+<Food Preservation, connectedTo, Packaging>
+<Food Preservation, connectedTo, Sensory Evaluation>
+<Food Processing Automation, connectedTo, Distribution>
+<Food Processing Automation, connectedTo, Ingredient Traceability>
+<Food Processing Automation, connectedTo, Product Shelf_Life Testing>
+<Food Processing Automation, connectedTo, Restaurant Reservation System>
+<Food Processing Automation, connectedTo, Sensory Evaluation>
+<Ingredient Traceability, connectedTo, Sensory Evaluation>
+<Kitchen Hygiene, connectedTo, Food Preservation>
+<Menu Planning, connectedTo, Consumer Feedback Collection>
+<Packaging, connectedTo, Supply Chain Traceability>
+<Product Shelf_Life Testing, connectedTo, Restaurant Reservation System>
+<Restaurant Management, connectedTo, Menu Planning>
+<Restaurant Reservation System, connectedTo, Branding and Marketing>
+<Sensory Evaluation, connectedTo, Inventory Management>
+<Sensory Evaluation, connectedTo, Service Delivery>
+<Service Delivery, connectedTo, Storage Solutions>
+<Storage Solutions, connectedTo, Restaurant Reservation System>
+<Supply Chain Traceability, connectedTo, Ingredient Traceability>
diff --git a/test/diagrams/graph_hard/diagrams_9.dot b/test/diagrams/graph_hard/diagrams_9.dot
new file mode 100644
index 0000000000000000000000000000000000000000..97d844d4fec04b7a0f220cac671e65794ff4d12a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_9.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=BT
+	N0 [label="Workflow Optimization" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N1 [label="Product Design" color="#4CAF50" fillcolor="#C8E6C9" shape=multipledocuments style=filled]
+	N2 [label="Parts Replacement" color="#E57373" fillcolor="#FFEBEE" shape=document style=filled]
+	N3 [label="Bills of Material Generation" color="#CFCFCF" fillcolor="#F6F6F6" shape=action style=filled]
+	N4 [label="Safety Audit" color="#CFCFCF" fillcolor="#F6F6F6" shape=rect style=filled]
+	N5 [label="Robotics Integration" color="#E57373" fillcolor="#FFEBEE" shape=document style=filled]
+	N6 [label="Painting" color="#CFCFCF" fillcolor="#F6F6F6" shape=preparation style=filled]
+	N7 [label="Predictive Maintenance" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N8 [label="Ergonomics Assessment" color="#CFCFCF" fillcolor="#F6F6F6" shape=preparation style=filled]
+	N9 [label="Maintenance" color="#E57373" fillcolor="#FFEBEE" shape=predefinedprocess style=filled]
+	N10 [label="Quality Control" color="#4CAF50" fillcolor="#C8E6C9" shape=rectangle style=filled]
+	N11 [label="Inventory Check" color="#CFCFCF" fillcolor="#F6F6F6" shape=inputoutput style=filled]
+	N12 [label="Tool Setup" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+	N13 [label="Final Testing" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N14 [label="Machine Calibration" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N15 [label="Factory Layout Planning" color="#4CAF50" fillcolor="#C8E6C9" shape=predefinedprocess style=filled]
+	N16 [label="Component Sourcing" color="#E57373" fillcolor="#FFEBEE" shape=rect style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#E57373" fillcolor="#FFEBEE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Design Review {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Design Review"
+		nest0_0 [label="Production Scheduling" color="#4CAF50" fillcolor="#C8E6C9" shape=vnode_shape style=filled]
+		nest0_1 [label="Welding" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	}
+	subgraph cluster_Inspection {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Inspection"
+		nest1_0 [label="Batch Tracking" color="#CFCFCF" fillcolor="#F6F6F6" shape=vnode_shape style=filled]
+		nest1_1 [label="Tool Path Generation" color="#4CAF50" fillcolor="#C8E6C9" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#4CAF50" penwidth=1.5 style=dashed label="innovates" dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#E57373" penwidth=1.5 style=solid label="mixes" dir=forward]
+	N6 -> N7 [color="#E57373" penwidth=1.5 style=solid label="repairs" dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N14 -> N15 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest0_0 [color="#E57373" penwidth=1.5 style=dashed label="inspects" dir=forward]
+	nest0_1 -> N2 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N15 -> nest1_0 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N16 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N16 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N13 -> S1 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	S1 -> N15 [color="#4CAF50" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N16 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#4CAF50" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#E57373" penwidth=1.5 style=dashed label="improves" dir=forward]
+	M0 -> N10 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_9.txt b/test/diagrams/graph_hard/diagrams_9.txt
new file mode 100644
index 0000000000000000000000000000000000000000..67ec6b17f9f99abef829ba06c41610e860db0ca7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_9.txt
@@ -0,0 +1,32 @@
+<Batch Tracking, connectedTo, Tool Path Generation>
+<Batch Tracking, partOf, Batch Tracking>
+<Bills of Material Generation, connectedTo, Safety Audit>
+<Bills of Material Generation, improves, Quality Control>
+<Ergonomics Assessment, connectedTo, Component Sourcing>
+<Ergonomics Assessment, connectedTo, Factory Layout Planning>
+<Ergonomics Assessment, connectedTo, Maintenance>
+<Ergonomics Assessment, connectedTo, Quality Control>
+<Factory Layout Planning, connectedTo, Batch Tracking>
+<Factory Layout Planning, connectedTo, Component Sourcing>
+<Final Testing, connectedTo, Component Sourcing>
+<Final Testing, connectedTo, Factory Layout Planning>
+<Final Testing, connectedTo, Machine Calibration>
+<Inventory Check, connectedTo, Tool Setup>
+<Machine Calibration, connectedTo, Factory Layout Planning>
+<Maintenance, connectedTo, Quality Control>
+<Maintenance, inspects, Production Scheduling>
+<Painting, repairs, Predictive Maintenance>
+<Parts Replacement, innovates, Bills of Material Generation>
+<Predictive Maintenance, connectedTo, Ergonomics Assessment>
+<Product Design, connectedTo, Parts Replacement>
+<Product Design, connectedTo, Quality Control>
+<Production Scheduling, connectedTo, Welding>
+<Quality Control, connectedTo, Inventory Check>
+<Robotics Integration, connectedTo, Quality Control>
+<Robotics Integration, mixes, Painting>
+<Safety Audit, connectedTo, Robotics Integration>
+<Tool Path Generation, connectedTo, Component Sourcing>
+<Tool Path Generation, partOf, Tool Path Generation>
+<Tool Setup, connectedTo, Final Testing>
+<Welding, connectedTo, Parts Replacement>
+<Workflow Optimization, connectedTo, Product Design>
diff --git a/test/diagrams/graph_hard/diagrams_90.dot b/test/diagrams/graph_hard/diagrams_90.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0fcc3b09949186056a7391872b6ade40c7f90bb9
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_90.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=TB
+	N0 [label="Inventory Management" color="#AF56A6" fillcolor="#DDCEDD" shape=multipledocuments style=filled]
+	N1 [label="Ingredient Sourcing" color="#AF56A6" fillcolor="#DDCEDD" shape=multipledocuments style=filled]
+	N2 [label="Cooking" color="#00BCD4" fillcolor="#E0F7FA" shape=database style=filled]
+	N3 [label="Regulatory Compliance" color="#AF56A6" fillcolor="#DDCEDD" shape=action style=filled]
+	N4 [label="Sensory Evaluation" color="#00BCD4" fillcolor="#E0F7FA" shape=multipledocuments style=filled]
+	N5 [label="New Product Launch" color="#00BCD4" fillcolor="#E0F7FA" shape=inputoutput style=filled]
+	N6 [label="Kitchen Hygiene" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+	N7 [label="Consumer Feedback Collection" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N8 [label="Cuisine Innovation" color="#AF56A6" fillcolor="#DDCEDD" shape=inputoutput style=filled]
+	N9 [label="Food Packaging Design" color="#00BCD4" fillcolor="#E0F7FA" shape=inputoutput style=filled]
+	N10 [label="Beverage Production" color="#AF56A6" fillcolor="#DDCEDD" shape=predefinedprocess style=filled]
+	N11 [label="Supply Chain Traceability" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N12 [label="Storage Solutions" color="#00BCD4" fillcolor="#E0F7FA" shape=rectangle style=filled]
+	N13 [label="Allergen Management" color="#CDDC39" fillcolor="#E6EE9C" shape=rectangle style=filled]
+	S1 [label="" color="#00BCD4" fillcolor="#E0F7FA" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#AF56A6" fillcolor="#DDCEDD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Catering Operations {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Catering Operations"
+		nest0_0 [label="Packaging" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+		nest0_1 [label="Quality Control" color="#CDDC39" fillcolor="#E6EE9C" shape=database style=filled]
+		nest0_2 [label="Supplier Management" color="#AF56A6" fillcolor="#DDCEDD" shape=action style=filled]
+	}
+	subgraph cluster_Restaurant Reservation System {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Restaurant Reservation System"
+		nest1_0 [label="Branding and Marketing" color="#CDDC39" fillcolor="#E6EE9C" shape=preparation style=filled]
+		nest1_1 [label="Recipe Development" color="#00BCD4" fillcolor="#E0F7FA" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed label="brands" dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#CDDC39" penwidth=1.5 style=dashed label="sanitizes" dir=forward]
+	N6 -> N7 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#00BCD4" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#CDDC39" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#AF56A6" penwidth=1.5 style=solid label="audits" dir=forward]
+	N2 -> nest1_0 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N10 [color="#00BCD4" penwidth=1.5 style=dashed label="prepares" dir=forward]
+	N3 -> S1 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#AF56A6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N6 [color="#CDDC39" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=solid label="inspects" dir=forward]
+	S1 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#AF56A6" penwidth=1.5 style=solid dir=forward]
+	M0 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N5 [color="#00BCD4" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_90.txt b/test/diagrams/graph_hard/diagrams_90.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ed83dfa850fc4a277cc4552a83a4ff02ee703bf6
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_90.txt
@@ -0,0 +1,27 @@
+<Beverage Production, connectedTo, Supply Chain Traceability>
+<Branding and Marketing, audits, Recipe Development>
+<Consumer Feedback Collection, connectedTo, Cuisine Innovation>
+<Cooking, brands, Regulatory Compliance>
+<Cooking, connectedTo, Branding and Marketing>
+<Cuisine Innovation, connectedTo, Food Packaging Design>
+<Food Packaging Design, connectedTo, Beverage Production>
+<Ingredient Sourcing, connectedTo, Cooking>
+<Ingredient Sourcing, connectedTo, Regulatory Compliance>
+<Inventory Management, connectedTo, Ingredient Sourcing>
+<Inventory Management, connectedTo, Regulatory Compliance>
+<Kitchen Hygiene, connectedTo, Consumer Feedback Collection>
+<New Product Launch, connectedTo, Packaging>
+<New Product Launch, sanitizes, Kitchen Hygiene>
+<Packaging, connectedTo, Quality Control>
+<Quality Control, connectedTo, Supplier Management>
+<Recipe Development, connectedTo, New Product Launch>
+<Recipe Development, prepares, Beverage Production>
+<Regulatory Compliance, connectedTo, Beverage Production>
+<Regulatory Compliance, connectedTo, Cuisine Innovation>
+<Regulatory Compliance, connectedTo, Kitchen Hygiene>
+<Regulatory Compliance, connectedTo, Sensory Evaluation>
+<Regulatory Compliance, inspects, Food Packaging Design>
+<Sensory Evaluation, connectedTo, New Product Launch>
+<Storage Solutions, connectedTo, Allergen Management>
+<Supplier Management, connectedTo, Cuisine Innovation>
+<Supply Chain Traceability, connectedTo, Storage Solutions>
diff --git a/test/diagrams/graph_hard/diagrams_91.dot b/test/diagrams/graph_hard/diagrams_91.dot
new file mode 100644
index 0000000000000000000000000000000000000000..df165b5dea3f6b46cc974f8b3d4fe913645c1f78
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_91.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=TB
+	N0 [label="Tournament Organization" color="#F06292" fillcolor="#FCE4EC" shape=inputoutput style=filled]
+	N1 [label="Data Analytics in Sports" color="#AABEC6" fillcolor="#E0E6E9" shape=rectangle style=filled]
+	N2 [label="Game Strategy" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N3 [label="Rule Enforcement" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N4 [label="Sports Psychology" color="#F06292" fillcolor="#FCE4EC" shape=document style=filled]
+	N5 [label="Venue Booking" color="#FFB2A5" fillcolor="#FFDCD6" shape=preparation style=filled]
+	N6 [label="Player Transfer" color="#AABEC6" fillcolor="#E0E6E9" shape=database style=filled]
+	N7 [label="Refereeing" color="#FFB2A5" fillcolor="#FFDCD6" shape=diamond style=filled]
+	N8 [label="Sports Analytics" color="#FFB2A5" fillcolor="#FFDCD6" shape=rectangle style=filled]
+	N9 [label="Athlete Performance Tracking" color="#AABEC6" fillcolor="#E0E6E9" shape=database style=filled]
+	N10 [label="Anti_Doping Control" color="#AABEC6" fillcolor="#E0E6E9" shape=diamond style=filled]
+	N11 [label="Athlete Brand Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=parallelogram style=filled]
+	N12 [label="Accessibility in Sports Venues" color="#FFB2A5" fillcolor="#FFDCD6" shape=parallelogram style=filled]
+	N13 [label="Training Session" color="#F06292" fillcolor="#FCE4EC" shape=rectangle style=filled]
+	N14 [label="Sports Betting Regulation" color="#AABEC6" fillcolor="#E0E6E9" shape=rect style=filled]
+	N15 [label="League Management" color="#F06292" fillcolor="#FCE4EC" shape=predefinedprocess style=filled]
+	N16 [label="Merchandise Sales" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N17 [label="Athlete Nutrition Planning" color="#AABEC6" fillcolor="#E0E6E9" shape=diamond style=filled]
+	S0 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#F06292" fillcolor="#FCE4EC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFB2A5" fillcolor="#FFDCD6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Coaching {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Coaching"
+		nest0_0 [label="Fitness Conditioning" color="#AABEC6" fillcolor="#E0E6E9" shape=diamond style=filled]
+		nest0_1 [label="Fan Engagement" color="#FFB2A5" fillcolor="#FFDCD6" shape=diamond style=filled]
+	}
+	subgraph cluster_Sports Medicine {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Sports Medicine"
+		nest1_0 [label="Stadium Operations" color="#AABEC6" fillcolor="#E0E6E9" shape=action style=filled]
+		nest1_1 [label="Scorekeeping" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+		nest1_2 [label="Injury Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=predefinedprocess style=filled]
+		nest1_3 [label="Community Sports Programs" color="#F06292" fillcolor="#FCE4EC" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#AABEC6" penwidth=1.5 style=solid label="licenses" dir=forward]
+	N11 -> N12 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#FFB2A5" penwidth=1.5 style=dashed label="secures" dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	N16 -> N17 [color="#AABEC6" penwidth=1.5 style=solid label="loses" dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#FFB2A5" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N14 -> nest1_0 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	nest1_3 -> N9 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N6 -> S0 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N3 -> S1 [color="#F06292" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#000000" penwidth=1.5 style=solid label="advises" dir=forward]
+	S1 -> N5 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N12 -> S2 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N17 [color="#F06292" penwidth=1.5 style=solid label="maintains" dir=forward]
+	S2 -> N15 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N16 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#FFB2A5" penwidth=1.5 style=dashed dir=forward]
+	N10 -> M1 [color="#F06292" penwidth=1.5 style=solid dir=forward]
+	N8 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M1 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_91.txt b/test/diagrams/graph_hard/diagrams_91.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8f5ca193d329e6bd471d6af9625431f18bec27a1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_91.txt
@@ -0,0 +1,37 @@
+<Accessibility in Sports Venues, connectedTo, League Management>
+<Accessibility in Sports Venues, connectedTo, Merchandise Sales>
+<Accessibility in Sports Venues, connectedTo, Training Session>
+<Accessibility in Sports Venues, maintains, Athlete Nutrition Planning>
+<Anti_Doping Control, connectedTo, Accessibility in Sports Venues>
+<Anti_Doping Control, connectedTo, Fitness Conditioning>
+<Anti_Doping Control, licenses, Athlete Brand Management>
+<Athlete Brand Management, connectedTo, Accessibility in Sports Venues>
+<Athlete Performance Tracking, connectedTo, Anti_Doping Control>
+<Community Sports Programs, connectedTo, Athlete Performance Tracking>
+<Data Analytics in Sports, connectedTo, Game Strategy>
+<Fan Engagement, connectedTo, Venue Booking>
+<Fan Engagement, partOf, Fan Engagement>
+<Fitness Conditioning, connectedTo, Fan Engagement>
+<Fitness Conditioning, partOf, Fitness Conditioning>
+<Game Strategy, connectedTo, Rule Enforcement>
+<Injury Management, connectedTo, Community Sports Programs>
+<League Management, connectedTo, Merchandise Sales>
+<Merchandise Sales, loses, Athlete Nutrition Planning>
+<Player Transfer, connectedTo, Anti_Doping Control>
+<Player Transfer, connectedTo, Athlete Performance Tracking>
+<Player Transfer, connectedTo, Refereeing>
+<Refereeing, connectedTo, Sports Analytics>
+<Rule Enforcement, advises, Sports Analytics>
+<Rule Enforcement, connectedTo, Sports Psychology>
+<Rule Enforcement, connectedTo, Venue Booking>
+<Scorekeeping, connectedTo, Injury Management>
+<Sports Analytics, connectedTo, Accessibility in Sports Venues>
+<Sports Analytics, connectedTo, Athlete Performance Tracking>
+<Sports Betting Regulation, connectedTo, League Management>
+<Sports Betting Regulation, connectedTo, Stadium Operations>
+<Sports Psychology, connectedTo, Venue Booking>
+<Stadium Operations, connectedTo, Scorekeeping>
+<Tournament Organization, connectedTo, Data Analytics in Sports>
+<Training Session, secures, Sports Betting Regulation>
+<Venue Booking, connectedTo, Accessibility in Sports Venues>
+<Venue Booking, connectedTo, Player Transfer>
diff --git a/test/diagrams/graph_hard/diagrams_92.dot b/test/diagrams/graph_hard/diagrams_92.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e3832a9f3dae030dd76f30b8b7e6aa417df96584
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_92.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=RL
+	N0 [label="Injury Management" color="#FBC02D" fillcolor="#FFFDE7" shape=inputoutput style=filled]
+	N1 [label="Fan Club Management" color="#FBC02D" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+	N2 [label="Athlete Performance Tracking" color="#FFE69C" fillcolor="#FFF9D4" shape=preparation style=filled]
+	N3 [label="Game Strategy" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N4 [label="Team Management" color="#FFE69C" fillcolor="#FFF9D4" shape=inputoutput style=filled]
+	N5 [label="Rule Enforcement" color="#FBC02D" fillcolor="#FFFDE7" shape=database style=filled]
+	N6 [label="Sports Psychology" color="#FBC02D" fillcolor="#FFFDE7" shape=inputoutput style=filled]
+	N7 [label="Sports Marketing" color="#FFE69C" fillcolor="#FFF9D4" shape=vnode_shape style=filled]
+	N8 [label="Venue Booking" color="#7E57C2" fillcolor="#EDE7F6" shape=database style=filled]
+	N9 [label="Accessibility in Sports Venues" color="#FFE69C" fillcolor="#FFF9D4" shape=diamond style=filled]
+	N10 [label="Fan Experience Enhancement" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N11 [label="Match Play" color="#FFE69C" fillcolor="#FFF9D4" shape=parallelogram style=filled]
+	N12 [label="Data Analytics in Sports" color="#FBC02D" fillcolor="#FFFDE7" shape=preparation style=filled]
+	N13 [label="Talent Scouting" color="#FFE69C" fillcolor="#FFF9D4" shape=action style=filled]
+	N14 [label="Training Session" color="#7E57C2" fillcolor="#EDE7F6" shape=database style=filled]
+	N15 [label="Scorekeeping" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#FBC02D" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#7E57C2" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFE69C" fillcolor="#FFF9D4" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FBC02D" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#FBC02D" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Ticketing Sales {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Ticketing Sales"
+		nest0_0 [label="Sports Betting Regulation" color="#FFE69C" fillcolor="#FFF9D4" shape=preparation style=filled]
+		nest0_1 [label="Tournament Organization" color="#FFE69C" fillcolor="#FFF9D4" shape=database style=filled]
+		nest0_2 [label="Fan Engagement" color="#FFE69C" fillcolor="#FFF9D4" shape=multipledocuments style=filled]
+	}
+	subgraph cluster_Anti_Doping Control {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Anti_Doping Control"
+		nest1_0 [label="Refereeing" color="#7E57C2" fillcolor="#EDE7F6" shape=rect style=filled]
+		nest1_1 [label="Media Rights Negotiation" color="#FBC02D" fillcolor="#FFFDE7" shape=database style=filled]
+	}
+	N0 -> N1 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#7E57C2" penwidth=1.5 style=solid label="wins" dir=forward]
+	N2 -> N3 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed label="sells" dir=forward]
+	N11 -> N12 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest0_0 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N7 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	N13 -> nest1_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> N9 [color="#FFE69C" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S0 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N15 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S0 -> N6 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N8 -> S1 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	S1 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> S2 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	S2 -> N5 [color="#000000" penwidth=1.5 style=solid label="regulates" dir=forward]
+	S2 -> N13 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N10 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid label="rehabilitates" dir=forward]
+	M0 -> N9 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N7 -> M1 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M1 [color="#7E57C2" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N13 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+	N10 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M2 [color="#7E57C2" penwidth=1.5 style=solid label="recruits" dir=forward]
+	N1 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N4 -> M2 [color="#FFE69C" penwidth=1.5 style=solid dir=forward]
+	M2 -> N12 [color="#7E57C2" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_93.dot b/test/diagrams/graph_hard/diagrams_93.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2a22e9829c3bcb34aceacf3b2addd782978b305b
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_93.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=LR
+	N0 [label="Sports Medicine" color="#FFF8A6" fillcolor="#FFFDE0" shape=database style=filled]
+	N1 [label="Talent Scouting" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N2 [label="Fan Experience Enhancement" color="#FFF9AE" fillcolor="#FFFCE6" shape=inputoutput style=filled]
+	N3 [label="Rule Enforcement" color="#FFF9AE" fillcolor="#FFFCE6" shape=multipledocuments style=filled]
+	N4 [label="Scorekeeping" color="#FFF9AE" fillcolor="#FFFCE6" shape=document style=filled]
+	N5 [label="Stadium Operations" color="#FFF9AE" fillcolor="#FFFCE6" shape=action style=filled]
+	N6 [label="Media Rights Negotiation" color="#FFF8A6" fillcolor="#FFFDE0" shape=multipledocuments style=filled]
+	N7 [label="Sports Analytics" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N8 [label="Refereeing" color="#9575CD" fillcolor="#EDE7F6" shape=document style=filled]
+	N9 [label="Fan Club Management" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	N10 [label="Ticketing Sales" color="#FFF9AE" fillcolor="#FFFCE6" shape=predefinedprocess style=filled]
+	N11 [label="Athlete Nutrition Planning" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N12 [label="Athlete Performance Tracking" color="#FFF8A6" fillcolor="#FFFDE0" shape=rectangle style=filled]
+	N13 [label="Sponsorship Management" color="#9575CD" fillcolor="#EDE7F6" shape=database style=filled]
+	N14 [label="Merchandise Sales" color="#9575CD" fillcolor="#EDE7F6" shape=action style=filled]
+	N15 [label="Injury Management" color="#FFF9AE" fillcolor="#FFFCE6" shape=rect style=filled]
+	S0 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Tournament Organization {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Tournament Organization"
+		nest0_0 [label="Player Transfer" color="#FFF8A6" fillcolor="#FFFDE0" shape=vnode_shape style=filled]
+		nest0_1 [label="Accessibility in Sports Venues" color="#FFF8A6" fillcolor="#FFFDE0" shape=diamond style=filled]
+		nest0_2 [label="Sports Technology Integration" color="#FFF9AE" fillcolor="#FFFCE6" shape=database style=filled]
+	}
+	subgraph cluster_Player Recruitment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Player Recruitment"
+		nest1_0 [label="Fitness Conditioning" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+		nest1_1 [label="Fan Engagement" color="#9575CD" fillcolor="#EDE7F6" shape=predefinedprocess style=filled]
+		nest1_2 [label="League Management" color="#FFF9AE" fillcolor="#FFFCE6" shape=document style=filled]
+	}
+	N0 -> N1 [color="#9575CD" penwidth=1.5 style=solid label="markets" dir=forward]
+	N1 -> N2 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFF8A6" penwidth=1.5 style=solid label="educates" dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#9575CD" penwidth=1.5 style=dashed label="scores" dir=forward]
+	N3 -> nest0_0 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> nest1_2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N12 -> nest1_0 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N2 [color="#FFF8A6" penwidth=1.5 style=solid label="equips" dir=forward]
+	N10 -> S0 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N11 -> S1 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N15 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N11 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N14 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	S2 -> N13 [color="#FFF8A6" penwidth=1.5 style=dashed label="designs" dir=forward]
+	S2 -> N15 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N3 -> M0 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M0 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	M0 -> N8 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N12 -> M1 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	M1 -> N14 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_93.txt b/test/diagrams/graph_hard/diagrams_93.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3b016c0ec5cbe8eca5966081c84d93670607f07a
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_93.txt
@@ -0,0 +1,34 @@
+<Accessibility in Sports Venues, scores, Sports Technology Integration>
+<Athlete Nutrition Planning, connectedTo, Athlete Performance Tracking>
+<Athlete Nutrition Planning, connectedTo, Injury Management>
+<Athlete Nutrition Planning, connectedTo, Merchandise Sales>
+<Athlete Nutrition Planning, connectedTo, Sponsorship Management>
+<Athlete Nutrition Planning, designs, Sponsorship Management>
+<Athlete Performance Tracking, connectedTo, Fitness Conditioning>
+<Athlete Performance Tracking, connectedTo, Merchandise Sales>
+<Athlete Performance Tracking, connectedTo, Sponsorship Management>
+<Fan Club Management, connectedTo, Ticketing Sales>
+<Fan Engagement, connectedTo, League Management>
+<Fan Experience Enhancement, connectedTo, Rule Enforcement>
+<Fitness Conditioning, connectedTo, Fan Engagement>
+<League Management, equips, Fan Experience Enhancement>
+<Media Rights Negotiation, connectedTo, Merchandise Sales>
+<Media Rights Negotiation, connectedTo, Sports Analytics>
+<Merchandise Sales, connectedTo, Injury Management>
+<Player Transfer, connectedTo, Accessibility in Sports Venues>
+<Refereeing, connectedTo, Fan Club Management>
+<Rule Enforcement, connectedTo, Player Transfer>
+<Rule Enforcement, connectedTo, Refereeing>
+<Rule Enforcement, connectedTo, Scorekeeping>
+<Scorekeeping, connectedTo, Refereeing>
+<Scorekeeping, connectedTo, Stadium Operations>
+<Sponsorship Management, connectedTo, Merchandise Sales>
+<Sports Analytics, educates, Refereeing>
+<Sports Medicine, markets, Talent Scouting>
+<Sports Technology Integration, connectedTo, Injury Management>
+<Stadium Operations, connectedTo, Media Rights Negotiation>
+<Talent Scouting, connectedTo, Fan Experience Enhancement>
+<Ticketing Sales, connectedTo, Athlete Nutrition Planning>
+<Ticketing Sales, connectedTo, Athlete Performance Tracking>
+<Ticketing Sales, connectedTo, Merchandise Sales>
+<Ticketing Sales, connectedTo, Sponsorship Management>
diff --git a/test/diagrams/graph_hard/diagrams_94.dot b/test/diagrams/graph_hard/diagrams_94.dot
new file mode 100644
index 0000000000000000000000000000000000000000..29ffd4b43a64467d159bdff93e238c96e363dfe1
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_94.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=LR
+	N0 [label="E_commerce Management" color="#388E3C" fillcolor="#F1F8E9" shape=document style=filled]
+	N1 [label="Seasonal Collection Planning" color="#9575CD" fillcolor="#EDE7F6" shape=vnode_shape style=filled]
+	N2 [label="Textile Manufacturing" color="#A188DB" fillcolor="#DED7F0" shape=database style=filled]
+	N3 [label="Styling" color="#9575CD" fillcolor="#EDE7F6" shape=multipledocuments style=filled]
+	N4 [label="Fashion Show Production" color="#A188DB" fillcolor="#DED7F0" shape=vnode_shape style=filled]
+	N5 [label="Brand Licensing" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N6 [label="Intellectual Property Protection" color="#9575CD" fillcolor="#EDE7F6" shape=inputoutput style=filled]
+	N7 [label="Footwear Production" color="#A188DB" fillcolor="#DED7F0" shape=database style=filled]
+	N8 [label="Accessory Design" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+	S0 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9575CD" fillcolor="#EDE7F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#A188DB" fillcolor="#DED7F0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Material Sourcing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Material Sourcing"
+		nest0_0 [label="Garment Production" color="#A188DB" fillcolor="#DED7F0" shape=parallelogram style=filled]
+		nest0_1 [label="Sample Creation" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+		nest0_2 [label="Custom Apparel Design" color="#9575CD" fillcolor="#EDE7F6" shape=rectangle style=filled]
+		nest0_3 [label="Color Palette Selection" color="#388E3C" fillcolor="#F1F8E9" shape=action style=filled]
+	}
+	subgraph cluster_Marketing Campaign {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Marketing Campaign"
+		nest1_0 [label="Influencer Collaboration" color="#9575CD" fillcolor="#EDE7F6" shape=vnode_shape style=filled]
+		nest1_1 [label="Global Sourcing Strategy" color="#388E3C" fillcolor="#F1F8E9" shape=database style=filled]
+		nest1_2 [label="Embroidery and Embellishment" color="#9575CD" fillcolor="#EDE7F6" shape=vnode_shape style=filled]
+		nest1_3 [label="Wholesale Distribution" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	}
+	N0 -> N1 [color="#388E3C" penwidth=1.5 style=dashed label="sustains" dir=forward]
+	N1 -> N2 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid label="blogs" dir=forward]
+	N6 -> N7 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> nest0_0 [color="#A188DB" penwidth=1.5 style=dashed label="sources" dir=forward]
+	nest0_3 -> N6 [color="#A188DB" penwidth=1.5 style=dashed label="photographs" dir=forward]
+	nest1_0 -> nest1_1 [color="#388E3C" penwidth=1.5 style=dashed label="audits" dir=forward]
+	nest1_1 -> nest1_2 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N4 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N7 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#A188DB" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N5 -> M1 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#9575CD" penwidth=1.5 style=solid dir=forward]
+	M1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#9575CD" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M2 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N2 -> M2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M2 -> N5 [color="#A188DB" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_94.txt b/test/diagrams/graph_hard/diagrams_94.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c9a48b04a8230c33a5061bee6c553f1fc41e82d7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_94.txt
@@ -0,0 +1,31 @@
+<Brand Licensing, blogs, Intellectual Property Protection>
+<Brand Licensing, connectedTo, Footwear Production>
+<Color Palette Selection, photographs, Intellectual Property Protection>
+<Custom Apparel Design, connectedTo, Color Palette Selection>
+<E_commerce Management, connectedTo, Brand Licensing>
+<E_commerce Management, connectedTo, Footwear Production>
+<E_commerce Management, connectedTo, Styling>
+<E_commerce Management, sustains, Seasonal Collection Planning>
+<Embroidery and Embellishment, connectedTo, Wholesale Distribution>
+<Fashion Show Production, connectedTo, Accessory Design>
+<Fashion Show Production, connectedTo, Brand Licensing>
+<Fashion Show Production, connectedTo, Footwear Production>
+<Fashion Show Production, connectedTo, Influencer Collaboration>
+<Fashion Show Production, connectedTo, Intellectual Property Protection>
+<Footwear Production, connectedTo, Accessory Design>
+<Garment Production, connectedTo, Sample Creation>
+<Global Sourcing Strategy, connectedTo, Embroidery and Embellishment>
+<Influencer Collaboration, audits, Global Sourcing Strategy>
+<Intellectual Property Protection, connectedTo, Footwear Production>
+<Sample Creation, connectedTo, Custom Apparel Design>
+<Seasonal Collection Planning, connectedTo, Brand Licensing>
+<Seasonal Collection Planning, connectedTo, Styling>
+<Seasonal Collection Planning, connectedTo, Textile Manufacturing>
+<Styling, connectedTo, Brand Licensing>
+<Styling, connectedTo, Fashion Show Production>
+<Styling, connectedTo, Footwear Production>
+<Styling, sources, Garment Production>
+<Textile Manufacturing, connectedTo, Brand Licensing>
+<Textile Manufacturing, connectedTo, Footwear Production>
+<Textile Manufacturing, connectedTo, Styling>
+<Wholesale Distribution, connectedTo, Fashion Show Production>
diff --git a/test/diagrams/graph_hard/diagrams_95.dot b/test/diagrams/graph_hard/diagrams_95.dot
new file mode 100644
index 0000000000000000000000000000000000000000..934897afe0ce808e2dcc9e1e2ef90ca1b5927b75
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_95.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=BT
+	N0 [label="Haute Couture Creation" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N1 [label="Retail Store Merchandising" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N2 [label="Accessory Design" color="#E0E0E0" fillcolor="#EBEBEB" shape=action style=filled]
+	N3 [label="Quality Check" color="#E0E0E0" fillcolor="#EBEBEB" shape=predefinedprocess style=filled]
+	N4 [label="Sustainable Fashion Practices" color="#E0E0E0" fillcolor="#EBEBEB" shape=document style=filled]
+	N5 [label="Textile Manufacturing" color="#90A4AE" fillcolor="#ECEFF1" shape=action style=filled]
+	N6 [label="Pattern Making" color="#B8C0F5" fillcolor="#ECF0FD" shape=preparation style=filled]
+	N7 [label="PR and Media Outreach" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+	N8 [label="Packaging" color="#B8C0F5" fillcolor="#ECF0FD" shape=predefinedprocess style=filled]
+	N9 [label="Seasonal Collection Planning" color="#E0E0E0" fillcolor="#EBEBEB" shape=parallelogram style=filled]
+	N10 [label="Retail Sales" color="#B8C0F5" fillcolor="#ECF0FD" shape=diamond style=filled]
+	N11 [label="Product Photography" color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+	N12 [label="Brand Building" color="#B8C0F5" fillcolor="#ECF0FD" shape=action style=filled]
+	S0 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#B8C0F5" fillcolor="#ECF0FD" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Customer Feedback Analysis {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Customer Feedback Analysis"
+		nest0_0 [label="Ready_to_Wear Collection Launch" color="#E0E0E0" fillcolor="#EBEBEB" shape=document style=filled]
+		nest0_1 [label="Custom Apparel Design" color="#B8C0F5" fillcolor="#ECF0FD" shape=vnode_shape style=filled]
+		nest0_2 [label="Marketing Campaign" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	}
+	subgraph cluster_Embroidery and Embellishment {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Embroidery and Embellishment"
+		nest1_0 [label="Wholesale Distribution" color="#90A4AE" fillcolor="#ECEFF1" shape=predefinedprocess style=filled]
+		nest1_1 [label="Garment Fitting Session" color="#90A4AE" fillcolor="#ECEFF1" shape=preparation style=filled]
+	}
+	N0 -> N1 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest0_0 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	nest0_2 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> nest1_0 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N10 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N6 -> S0 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+	N7 -> S1 [color="#B8C0F5" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=dashed label="manages" dir=forward]
+	N9 -> S2 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	M0 -> N8 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	N3 -> M2 [color="#B8C0F5" penwidth=1.5 style=solid dir=forward]
+	N0 -> M2 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N5 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_95.txt b/test/diagrams/graph_hard/diagrams_95.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b6f4f45ab1ff97d053d5761e8b00e2254d0f3e18
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_95.txt
@@ -0,0 +1,30 @@
+<Accessory Design, connectedTo, Packaging>
+<Accessory Design, connectedTo, Quality Check>
+<Custom Apparel Design, connectedTo, Marketing Campaign>
+<Garment Fitting Session, connectedTo, Retail Sales>
+<Haute Couture Creation, connectedTo, Retail Store Merchandising>
+<Haute Couture Creation, connectedTo, Textile Manufacturing>
+<Marketing Campaign, connectedTo, Sustainable Fashion Practices>
+<PR and Media Outreach, connectedTo, Brand Building>
+<PR and Media Outreach, connectedTo, Packaging>
+<PR and Media Outreach, connectedTo, Seasonal Collection Planning>
+<PR and Media Outreach, manages, Product Photography>
+<Packaging, connectedTo, Ready_to_Wear Collection Launch>
+<Packaging, connectedTo, Seasonal Collection Planning>
+<Packaging, connectedTo, Wholesale Distribution>
+<Pattern Making, connectedTo, Brand Building>
+<Pattern Making, connectedTo, PR and Media Outreach>
+<Pattern Making, connectedTo, Packaging>
+<Pattern Making, connectedTo, Seasonal Collection Planning>
+<Product Photography, connectedTo, Brand Building>
+<Quality Check, connectedTo, Sustainable Fashion Practices>
+<Quality Check, connectedTo, Textile Manufacturing>
+<Ready_to_Wear Collection Launch, connectedTo, Custom Apparel Design>
+<Retail Sales, connectedTo, Product Photography>
+<Retail Store Merchandising, connectedTo, Accessory Design>
+<Seasonal Collection Planning, connectedTo, Brand Building>
+<Seasonal Collection Planning, connectedTo, Product Photography>
+<Seasonal Collection Planning, connectedTo, Retail Sales>
+<Sustainable Fashion Practices, connectedTo, Textile Manufacturing>
+<Textile Manufacturing, connectedTo, Pattern Making>
+<Wholesale Distribution, connectedTo, Garment Fitting Session>
diff --git a/test/diagrams/graph_hard/diagrams_96.dot b/test/diagrams/graph_hard/diagrams_96.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ca04074d656c8123d48741b6272eb4c2e2a74194
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_96.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=BT
+	N0 [label="Product Photography" color="#FFC085" fillcolor="#FFDAB9" shape=predefinedprocess style=filled]
+	N1 [label="Footwear Production" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N2 [label="Marketing Campaign" color="#CFCFCF" fillcolor="#F6F6F6" shape=preparation style=filled]
+	N3 [label="Retail Sales" color="#CFCFCF" fillcolor="#F6F6F6" shape=vnode_shape style=filled]
+	N4 [label="Retail Store Merchandising" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N5 [label="Garment Fitting Session" color="#FFF9AE" fillcolor="#FFFCE6" shape=multipledocuments style=filled]
+	N6 [label="Sample Creation" color="#FFF9AE" fillcolor="#FFFCE6" shape=preparation style=filled]
+	N7 [label="Fashion Show Production" color="#FFC085" fillcolor="#FFDAB9" shape=vnode_shape style=filled]
+	N8 [label="Brand Building" color="#FFF9AE" fillcolor="#FFFCE6" shape=database style=filled]
+	N9 [label="Textile Manufacturing" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N10 [label="Customer Feedback Analysis" color="#FFC085" fillcolor="#FFDAB9" shape=vnode_shape style=filled]
+	N11 [label="Sustainable Fashion Practices" color="#CFCFCF" fillcolor="#F6F6F6" shape=rectangle style=filled]
+	N12 [label="Pattern Making" color="#FFC085" fillcolor="#FFDAB9" shape=vnode_shape style=filled]
+	N13 [label="E_commerce Management" color="#FFC085" fillcolor="#FFDAB9" shape=predefinedprocess style=filled]
+	N14 [label="Haute Couture Creation" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+	S0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#CFCFCF" fillcolor="#F6F6F6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Wholesale Distribution {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Wholesale Distribution"
+		nest0_0 [label="Material Sourcing" color="#FFC085" fillcolor="#FFDAB9" shape=vnode_shape style=filled]
+		nest0_1 [label="Accessory Design" color="#FFF9AE" fillcolor="#FFFCE6" shape=preparation style=filled]
+	}
+	subgraph cluster_Packaging {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Packaging"
+		nest1_0 [label="Influencer Collaboration" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+		nest1_1 [label="Ready_to_Wear Collection Launch" color="#FFC085" fillcolor="#FFDAB9" shape=vnode_shape style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FFF9AE" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFC085" penwidth=1.5 style=dashed label="audits" dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#FFC085" penwidth=1.5 style=solid label="protects" dir=forward]
+	N9 -> N10 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest0_0 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N8 -> nest1_0 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N4 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N7 -> S0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N14 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N12 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	S0 -> N10 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S1 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> S2 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N12 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	S2 -> N8 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#FFC085" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N7 [color="#FFF9AE" penwidth=1.5 style=dashed dir=forward]
+	N3 -> M1 [color="#CFCFCF" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#CFCFCF" penwidth=1.5 style=dashed dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N11 [color="#FFC085" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_96.txt b/test/diagrams/graph_hard/diagrams_96.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b04939e5848e6d7153e40e450f6d00fb1f4ef061
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_96.txt
@@ -0,0 +1,35 @@
+<Accessory Design, connectedTo, Pattern Making>
+<Brand Building, connectedTo, Influencer Collaboration>
+<Brand Building, protects, Textile Manufacturing>
+<Customer Feedback Analysis, connectedTo, Sustainable Fashion Practices>
+<E_commerce Management, connectedTo, Haute Couture Creation>
+<Fashion Show Production, connectedTo, Brand Building>
+<Fashion Show Production, connectedTo, Customer Feedback Analysis>
+<Fashion Show Production, connectedTo, Haute Couture Creation>
+<Fashion Show Production, connectedTo, Pattern Making>
+<Fashion Show Production, connectedTo, Sustainable Fashion Practices>
+<Footwear Production, connectedTo, Fashion Show Production>
+<Footwear Production, connectedTo, Marketing Campaign>
+<Garment Fitting Session, audits, Sample Creation>
+<Influencer Collaboration, connectedTo, Ready_to_Wear Collection Launch>
+<Influencer Collaboration, partOf, Influencer Collaboration>
+<Marketing Campaign, connectedTo, Fashion Show Production>
+<Marketing Campaign, connectedTo, Retail Sales>
+<Material Sourcing, connectedTo, Accessory Design>
+<Pattern Making, connectedTo, E_commerce Management>
+<Product Photography, connectedTo, Brand Building>
+<Product Photography, connectedTo, Footwear Production>
+<Product Photography, connectedTo, Pattern Making>
+<Product Photography, connectedTo, Sustainable Fashion Practices>
+<Ready_to_Wear Collection Launch, connectedTo, Retail Store Merchandising>
+<Ready_to_Wear Collection Launch, partOf, Ready_to_Wear Collection Launch>
+<Retail Sales, connectedTo, Retail Store Merchandising>
+<Retail Sales, connectedTo, Sustainable Fashion Practices>
+<Retail Store Merchandising, connectedTo, Garment Fitting Session>
+<Retail Store Merchandising, connectedTo, Pattern Making>
+<Retail Store Merchandising, connectedTo, Sustainable Fashion Practices>
+<Retail Store Merchandising, connectedTo, Textile Manufacturing>
+<Sample Creation, connectedTo, Fashion Show Production>
+<Sustainable Fashion Practices, connectedTo, Pattern Making>
+<Textile Manufacturing, connectedTo, Customer Feedback Analysis>
+<Textile Manufacturing, connectedTo, Material Sourcing>
diff --git a/test/diagrams/graph_hard/diagrams_97.dot b/test/diagrams/graph_hard/diagrams_97.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b6344bddb80f3dd07641ed6882f1c9cff6f191d4
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_97.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Candidate Sourcing" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	N1 [label="Recruitment Planning" color="#90A4AE" fillcolor="#ECEFF1" shape=predefinedprocess style=filled]
+	N2 [label="Employee Handbook Creation" color="#FF5722" fillcolor="#FFCCBC" shape=action style=filled]
+	N3 [label="Employee Relations" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N4 [label="Compensation and Benefits" color="#90A4AE" fillcolor="#ECEFF1" shape=document style=filled]
+	N5 [label="Exit Interviews" color="#90A4AE" fillcolor="#ECEFF1" shape=predefinedprocess style=filled]
+	N6 [label="HR Analytics" color="#FBC02D" fillcolor="#FFFDE7" shape=vnode_shape style=filled]
+	N7 [label="Health and Safety Management" color="#FF5722" fillcolor="#FFCCBC" shape=document style=filled]
+	N8 [label="Change Management" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N9 [label="Leave Management" color="#FBC02D" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+	N10 [label="Workforce Planning" color="#90A4AE" fillcolor="#ECEFF1" shape=inputoutput style=filled]
+	N11 [label="Disciplinary Procedures" color="#FF5722" fillcolor="#FFCCBC" shape=preparation style=filled]
+	N12 [label="Succession Planning" color="#FBC02D" fillcolor="#FFFDE7" shape=vnode_shape style=filled]
+	N13 [label="Employee Data Management" color="#90A4AE" fillcolor="#ECEFF1" shape=multipledocuments style=filled]
+	N14 [label="Wellness Programs" color="#FBC02D" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+	N15 [label="Performance Appraisal" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N16 [label="Onboarding Process" color="#FBC02D" fillcolor="#FFFDE7" shape=rect style=filled]
+	S0 [label="" color="#FBC02D" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FBC02D" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#FBC02D" fillcolor="#FFFDE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#90A4AE" fillcolor="#ECEFF1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Interview Scheduling {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Interview Scheduling"
+		nest0_0 [label="Compliance Management" color="#FBC02D" fillcolor="#FFFDE7" shape=rectangle style=filled]
+		nest0_1 [label="Offer Management" color="#90A4AE" fillcolor="#ECEFF1" shape=vnode_shape style=filled]
+	}
+	subgraph cluster_Employee Recognition Programs {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Employee Recognition Programs"
+		nest1_0 [label="Grievance Handling" color="#FF5722" fillcolor="#FFCCBC" shape=inputoutput style=filled]
+		nest1_1 [label="Job Posting" color="#FF5722" fillcolor="#FFCCBC" shape=document style=filled]
+	}
+	N0 -> N1 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FBC02D" penwidth=1.5 style=solid label="motivates" dir=forward]
+	N7 -> N8 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N11 -> N12 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N1 -> nest0_0 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N3 [color="#FF5722" penwidth=1.5 style=dashed label="recruits" dir=forward]
+	nest1_0 -> nest1_1 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N3 -> nest1_0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N15 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	N11 -> S0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N13 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	S0 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S1 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	S1 -> N7 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N14 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N12 -> S2 [color="#FF5722" penwidth=1.5 style=solid dir=forward]
+	S2 -> N14 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N16 [color="#FF5722" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M0 [color="#FF5722" penwidth=1.5 style=dashed label="records" dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N9 [color="#FBC02D" penwidth=1.5 style=solid dir=forward]
+	N4 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#FBC02D" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=dashed label="hires" dir=forward]
+	M1 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_97.txt b/test/diagrams/graph_hard/diagrams_97.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e65d04b544d6fabd28584a45c7e0027297dbd5b8
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_97.txt
@@ -0,0 +1,36 @@
+<Candidate Sourcing, connectedTo, Recruitment Planning>
+<Candidate Sourcing, hires, Change Management>
+<Change Management, connectedTo, Leave Management>
+<Compensation and Benefits, connectedTo, Change Management>
+<Compensation and Benefits, connectedTo, Exit Interviews>
+<Compliance Management, connectedTo, Offer Management>
+<Disciplinary Procedures, connectedTo, Employee Data Management>
+<Disciplinary Procedures, connectedTo, Performance Appraisal>
+<Disciplinary Procedures, connectedTo, Succession Planning>
+<Employee Data Management, connectedTo, Wellness Programs>
+<Employee Handbook Creation, connectedTo, Change Management>
+<Employee Handbook Creation, connectedTo, Employee Relations>
+<Employee Handbook Creation, connectedTo, Leave Management>
+<Employee Relations, connectedTo, Compensation and Benefits>
+<Employee Relations, connectedTo, Grievance Handling>
+<Exit Interviews, connectedTo, HR Analytics>
+<Exit Interviews, connectedTo, Health and Safety Management>
+<Exit Interviews, connectedTo, Leave Management>
+<Exit Interviews, connectedTo, Wellness Programs>
+<Grievance Handling, connectedTo, Job Posting>
+<HR Analytics, motivates, Health and Safety Management>
+<HR Analytics, records, Leave Management>
+<Health and Safety Management, connectedTo, Change Management>
+<Job Posting, connectedTo, Performance Appraisal>
+<Leave Management, connectedTo, Workforce Planning>
+<Offer Management, recruits, Employee Relations>
+<Performance Appraisal, connectedTo, Onboarding Process>
+<Recruitment Planning, connectedTo, Change Management>
+<Recruitment Planning, connectedTo, Compliance Management>
+<Recruitment Planning, connectedTo, Employee Handbook Creation>
+<Recruitment Planning, connectedTo, Leave Management>
+<Succession Planning, connectedTo, Employee Data Management>
+<Succession Planning, connectedTo, Onboarding Process>
+<Succession Planning, connectedTo, Wellness Programs>
+<Wellness Programs, connectedTo, Performance Appraisal>
+<Workforce Planning, connectedTo, Disciplinary Procedures>
diff --git a/test/diagrams/graph_hard/diagrams_98.txt b/test/diagrams/graph_hard/diagrams_98.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f9c1cc56963d24bdd4140465445af20da7de5db2
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_98.txt
@@ -0,0 +1,21 @@
+<Employee Data Management, connectedTo, Exit Interviews>
+<Employee Handbook Creation, connectedTo, Onboarding Process>
+<Employee Relations, connectedTo, Onboarding Process>
+<Exit Interviews, connectedTo, HR Policy Development>
+<Grievance Handling, connectedTo, Job Posting>
+<Grievance Handling, connectedTo, Leadership Training>
+<Grievance Handling, connectedTo, Offer Management>
+<Grievance Handling, connectedTo, Workforce Planning>
+<HR Policy Development, protects, Employee Handbook Creation>
+<Health and Safety Management, connectedTo, Union Negotiations>
+<Job Posting, connectedTo, Leadership Training>
+<Offer Management, connectedTo, Job Posting>
+<Offer Management, connectedTo, Leadership Training>
+<Offer Management, connectedTo, Onboarding Process>
+<Onboarding Process, connectedTo, Employee Data Management>
+<Onboarding Process, connectedTo, Job Posting>
+<Talent Management, connectedTo, Health and Safety Management>
+<Union Negotiations, connectedTo, Employee Relations>
+<Workforce Planning, connectedTo, Job Posting>
+<Workforce Planning, connectedTo, Offer Management>
+<Workforce Planning, connectedTo, Talent Management>
diff --git a/test/diagrams/graph_hard/diagrams_99.dot b/test/diagrams/graph_hard/diagrams_99.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ec6680ad57ba79d8a062a4ccbe1378530df290b7
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_99.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=RL
+	N0 [label="Talent Management" color="#BA68C8" fillcolor="#F3E5F5" shape=rectangle style=filled]
+	N1 [label="Work_Life Balance Initiatives" color="#FFB74D" fillcolor="#FFF3E0" shape=predefinedprocess style=filled]
+	N2 [label="Employee Engagement Surveys" color="#A188D0" fillcolor="#DACBE3" shape=rectangle style=filled]
+	N3 [label="HR Analytics" color="#FFB74D" fillcolor="#FFF3E0" shape=action style=filled]
+	N4 [label="Team Building Activities" color="#FFB74D" fillcolor="#FFF3E0" shape=parallelogram style=filled]
+	N5 [label="Exit Interviews" color="#FFB74D" fillcolor="#FFF3E0" shape=multipledocuments style=filled]
+	N6 [label="Onboarding Process" color="#A188D0" fillcolor="#DACBE3" shape=predefinedprocess style=filled]
+	N7 [label="Wellness Programs" color="#A188D0" fillcolor="#DACBE3" shape=diamond style=filled]
+	N8 [label="Diversity and Inclusion Initiatives" color="#BA68C8" fillcolor="#F3E5F5" shape=database style=filled]
+	N9 [label="Employee Relations" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+	N10 [label="Health and Safety Management" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N11 [label="Interview Scheduling" color="#FFB74D" fillcolor="#FFF3E0" shape=inputoutput style=filled]
+	N12 [label="Employee Recognition Programs" color="#BA68C8" fillcolor="#F3E5F5" shape=rect style=filled]
+	N13 [label="Global Mobility Programs" color="#BA68C8" fillcolor="#F3E5F5" shape=action style=filled]
+	S0 [label="" color="#BA68C8" fillcolor="#F3E5F5" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#FFB74D" fillcolor="#FFF3E0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FFB74D" fillcolor="#FFF3E0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#FFB74D" fillcolor="#FFF3E0" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Union Negotiations {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Union Negotiations"
+		nest0_0 [label="Employee Training" color="#BA68C8" fillcolor="#F3E5F5" shape=multipledocuments style=filled]
+		nest0_1 [label="Conflict Resolution" color="#BA68C8" fillcolor="#F3E5F5" shape=database style=filled]
+	}
+	subgraph cluster_Leave Management {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Leave Management"
+		nest1_0 [label="HR Policy Development" color="#A188D0" fillcolor="#DACBE3" shape=action style=filled]
+		nest1_1 [label="Leadership Training" color="#BA68C8" fillcolor="#F3E5F5" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#A188D0" penwidth=1.5 style=solid label="counsels" dir=forward]
+	N5 -> N6 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N5 -> nest0_0 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N3 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> nest1_0 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N10 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	N10 -> S0 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> S1 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N12 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#BA68C8" penwidth=1.5 style=dashed label="predicts" dir=forward]
+	N7 -> M0 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	M0 -> N11 [color="#A188D0" penwidth=1.5 style=solid dir=forward]
+	N6 -> M1 [color="#000000" penwidth=1.5 style=solid label="policies" dir=forward]
+	N1 -> M1 [color="#FFB74D" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#A188D0" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N8 [color="#BA68C8" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/graph_hard/diagrams_99.txt b/test/diagrams/graph_hard/diagrams_99.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f355f1c1329ce939227d90b4644d04ebc47cff8c
--- /dev/null
+++ b/test/diagrams/graph_hard/diagrams_99.txt
@@ -0,0 +1,27 @@
+<Conflict Resolution, connectedTo, HR Analytics>
+<Diversity and Inclusion Initiatives, connectedTo, Employee Relations>
+<Employee Engagement Surveys, connectedTo, HR Analytics>
+<Employee Engagement Surveys, predicts, Interview Scheduling>
+<Employee Recognition Programs, connectedTo, Global Mobility Programs>
+<Employee Relations, connectedTo, Health and Safety Management>
+<Employee Training, connectedTo, Conflict Resolution>
+<Exit Interviews, connectedTo, Employee Training>
+<Exit Interviews, connectedTo, HR Policy Development>
+<Exit Interviews, connectedTo, Interview Scheduling>
+<Exit Interviews, connectedTo, Onboarding Process>
+<HR Analytics, connectedTo, Diversity and Inclusion Initiatives>
+<HR Analytics, connectedTo, Team Building Activities>
+<HR Policy Development, connectedTo, Leadership Training>
+<Health and Safety Management, connectedTo, Employee Recognition Programs>
+<Health and Safety Management, connectedTo, Global Mobility Programs>
+<Health and Safety Management, connectedTo, Interview Scheduling>
+<Interview Scheduling, connectedTo, Employee Recognition Programs>
+<Leadership Training, connectedTo, Health and Safety Management>
+<Onboarding Process, connectedTo, Wellness Programs>
+<Onboarding Process, policies, Diversity and Inclusion Initiatives>
+<Talent Management, connectedTo, Work_Life Balance Initiatives>
+<Team Building Activities, counsels, Exit Interviews>
+<Wellness Programs, connectedTo, Diversity and Inclusion Initiatives>
+<Wellness Programs, connectedTo, Interview Scheduling>
+<Work_Life Balance Initiatives, connectedTo, Diversity and Inclusion Initiatives>
+<Work_Life Balance Initiatives, connectedTo, Employee Engagement Surveys>
diff --git a/test/diagrams/scanned_hard/diagrams_101.dot b/test/diagrams/scanned_hard/diagrams_101.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f8ae7e81a1d6199e3c5af484a4645e00a4cf236c
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_101.dot
@@ -0,0 +1,20 @@
+digraph {
+	rankdir=BT
+	N0 [label="Toolmark Analysis" color="#92C79A" fillcolor="#E8F0EA" shape=predefinedprocess style=filled]
+	N1 [label="Cyber Crime Investigation" color="#FFB74D" fillcolor="#FFF3E0" shape=multipledocuments style=filled]
+	N2 [label="Forensic Anthropology" color="#92C79A" fillcolor="#E8F0EA" shape=diamond style=filled]
+	N3 [label="Vehicle Forensics" color="#90A4AE" fillcolor="#ECEFF1" shape=inputoutput style=filled]
+	N4 [label="Handwriting Analysis" color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N5 [label="Data Recovery" color="#92C79A" fillcolor="#E8F0EA" shape=database style=filled]
+	N6 [label="Chain of Custody Management" color="#90A4AE" fillcolor="#ECEFF1" shape=inputoutput style=filled]
+	N7 [label="Evidence Collection" color="#FFB74D" fillcolor="#FFF3E0" shape=inputoutput style=filled]
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid label="digital_forensics" dir=forward]
+	N1 -> N2 [color="#90A4AE" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#92C79A" penwidth=1.5 style=solid label="ballistics" dir=forward]
+	N3 -> N4 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#90A4AE" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#FFB74D" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#90A4AE" penwidth=1.5 style=solid label="fingerprints" dir=forward]
+	N2 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> N2 [color="#000000" penwidth=1.5 style=solid label="investigates" dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/scanned_hard/diagrams_121.txt b/test/diagrams/scanned_hard/diagrams_121.txt
new file mode 100644
index 0000000000000000000000000000000000000000..90b41c8fb5f46ba90b8bdeba9197804eb88c68c6
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_121.txt
@@ -0,0 +1,17 @@
+<Atmospheric Sounding, connectedTo, Boundary Layer Study>
+<Atmospheric Sounding, partOf, Atmospheric Sounding>
+<Boundary Layer Study, integrates, Storm Tracking>
+<Boundary Layer Study, partOf, Boundary Layer Study>
+<Pollution Dispersion Modeling, connectedTo, Synoptic Chart Analysis>
+<Public Weather Briefing, classifies, Lightning Detection>
+<Severe Weather Warning, connectedTo, Lightning Detection>
+<Severe Weather Warning, connectedTo, Public Weather Briefing>
+<Severe Weather Warning, connectedTo, Storm Tracking>
+<Storm Tracking, connectedTo, Public Weather Briefing>
+<Synoptic Chart Analysis, connectedTo, Public Weather Briefing>
+<Synoptic Chart Analysis, warns, Weather Forecasting>
+<Weather Forecasting, connectedTo, Lightning Detection>
+<Weather Forecasting, connectedTo, Public Weather Briefing>
+<Weather Forecasting, connectedTo, Severe Weather Warning>
+<Weather Forecasting, connectedTo, Storm Tracking>
+<Weather Forecasting, simulates, Atmospheric Sounding>
diff --git a/test/diagrams/scanned_hard/diagrams_189.txt b/test/diagrams/scanned_hard/diagrams_189.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a32121714207264d464eaa09c254bf74f8ad1ffc
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_189.txt
@@ -0,0 +1,14 @@
+<Content Marketing, A or B tests, Market Research>
+<Content Marketing, connectedTo, Direct Mail Marketing>
+<Conversion Rate Optimization, connectedTo, Affiliate Marketing>
+<Customer Relationship Management, connectedTo, Event Marketing>
+<Direct Mail Marketing, monitors competitors, Social Media Marketing>
+<Event Marketing, connectedTo, Conversion Rate Optimization>
+<Loyalty Programs, connectedTo, Market Research>
+<Loyalty Programs, segments audiences, Content Marketing>
+<Loyalty Programs, tracks performance, Conversion Rate Optimization>
+<Market Research, connectedTo, Conversion Rate Optimization>
+<Social Media Marketing, connectedTo, Customer Relationship Management>
+<Telemarketing, connectedTo, Affiliate Marketing>
+<Telemarketing, connectedTo, Content Marketing>
+<Telemarketing, connectedTo, Loyalty Programs>
diff --git a/test/diagrams/scanned_hard/diagrams_195.dot b/test/diagrams/scanned_hard/diagrams_195.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5791dd4024b77963863d636719cd46a6315e98bb
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_195.dot
@@ -0,0 +1,43 @@
+digraph {
+	rankdir=LR
+	N0 [label="Sidechains and Layer 2 Solutions" color="#E91E63" fillcolor="#F8BBD0" shape=database style=filled]
+	N1 [label="Enterprise Blockchain Solutions" color="#E91E63" fillcolor="#F8BBD0" shape=inputoutput style=filled]
+	N2 [label="Cross_Chain Bridges" color="#A1D7CD" fillcolor="#EDF5F3" shape=vnode_shape style=filled]
+	N3 [label="Security Auditing for Blockchains" color="#E91E63" fillcolor="#F8BBD0" shape=rect style=filled]
+	N4 [label="Zero_Knowledge Proofs" color="#5C6BC0" fillcolor="#E8EAF6" shape=vnode_shape style=filled]
+	N5 [label="Interoperability Solutions" color="#5C6BC0" fillcolor="#E8EAF6" shape=predefinedprocess style=filled]
+	N6 [label="Cryptographic Hashing" color="#E91E63" fillcolor="#F8BBD0" shape=diamond style=filled]
+	N7 [label="Cross_Border Payments" color="#5C6BC0" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	N8 [label="Initial Coin Offerings" color="#A1D7CD" fillcolor="#EDF5F3" shape=rectangle style=filled]
+	S0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Consensus Mechanism Development {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Consensus Mechanism Development"
+		nest0_0 [label="Decentralized Applications Development" color="#A1D7CD" fillcolor="#EDF5F3" shape=database style=filled]
+		nest0_1 [label="Energy Trading on Blockchain" color="#5C6BC0" fillcolor="#E8EAF6" shape=database style=filled]
+		nest0_2 [label="Decentralized Network Design" color="#E91E63" fillcolor="#F8BBD0" shape=rect style=filled]
+		nest0_3 [label="Sharding Implementation" color="#A1D7CD" fillcolor="#EDF5F3" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#5C6BC0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#E91E63" penwidth=1.5 style=dashed label="verifies transactions" dir=forward]
+	N4 -> N5 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed label="generates hashes" dir=forward]
+	nest0_0 -> nest0_1 [color="#A1D7CD" penwidth=1.5 style=dashed label="processes payments" dir=forward]
+	nest0_1 -> nest0_2 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N4 -> nest0_0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	nest0_3 -> N3 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N4 -> S0 [color="#E91E63" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N6 [color="#A1D7CD" penwidth=1.5 style=solid label="integrates systems" dir=forward]
+	S0 -> N8 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#A1D7CD" penwidth=1.5 style=dashed label="operates nodes" dir=forward]
+	N0 -> M1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	N2 -> M1 [color="#E91E63" penwidth=1.5 style=solid dir=forward]
+	M1 -> N6 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/scanned_hard/diagrams_211.dot b/test/diagrams/scanned_hard/diagrams_211.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e4932f8d82f63eab6530fad0597ca70c7d2d931b
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_211.dot
@@ -0,0 +1,54 @@
+digraph {
+	rankdir=TB
+	N0 [label="Remote Access Solutions" color="#E0E0E0" fillcolor="#EBEBEB" shape=inputoutput style=filled]
+	N1 [label="Cabling and Wiring" color="#03A9F4" fillcolor="#B3E5FC" shape=inputoutput style=filled]
+	N2 [label="Virtualization" color="#03A9F4" fillcolor="#B3E5FC" shape=rect style=filled]
+	N3 [label="Cloud Integration with On_premise" color="#03A9F4" fillcolor="#B3E5FC" shape=parallelogram style=filled]
+	N4 [label="Troubleshooting and Support" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+	N5 [label="Data Center Management" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+	N6 [label="IT Asset Management" color="#E0E0E0" fillcolor="#EBEBEB" shape=action style=filled]
+	N7 [label="DNS Management" color="#E57373" fillcolor="#FFEBEE" shape=rectangle style=filled]
+	N8 [label="Automation Scripting" color="#E0E0E0" fillcolor="#EBEBEB" shape=action style=filled]
+	N9 [label="Backup and Recovery Systems" color="#03A9F4" fillcolor="#B3E5FC" shape=database style=filled]
+	N10 [label="Virtual Desktop Infrastructure" color="#E57373" fillcolor="#FFEBEE" shape=inputoutput style=filled]
+	N11 [label="Patch Management" color="#E0E0E0" fillcolor="#EBEBEB" shape=parallelogram style=filled]
+	N12 [label="Proxy Server Configuration" color="#E0E0E0" fillcolor="#EBEBEB" shape=multipledocuments style=filled]
+	S0 [label="" color="#03A9F4" fillcolor="#B3E5FC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#03A9F4" fillcolor="#B3E5FC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#03A9F4" fillcolor="#B3E5FC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Hardware Maintenance {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Hardware Maintenance"
+		nest0_0 [label="Monitoring and Alerting" color="#E0E0E0" fillcolor="#EBEBEB" shape=diamond style=filled]
+		nest0_1 [label="Hardware Procurement" color="#03A9F4" fillcolor="#B3E5FC" shape=hexagon style=filled]
+		nest0_2 [label="Capacity Planning" color="#E0E0E0" fillcolor="#EBEBEB" shape=rectangle style=filled]
+	}
+	N0 -> N1 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#E0E0E0" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#03A9F4" penwidth=1.5 style=dashed label="maintains hardware" dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#E57373" penwidth=1.5 style=dashed label="configures load balancers" dir=forward]
+	N11 -> N12 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> nest0_2 [color="#E0E0E0" penwidth=1.5 style=dashed label="installs racks" dir=forward]
+	N1 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed label="plans capacity" dir=forward]
+	nest0_2 -> N10 [color="#E0E0E0" penwidth=1.5 style=solid dir=forward]
+	N5 -> S0 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N10 [color="#03A9F4" penwidth=1.5 style=solid label="monitors performance" dir=forward]
+	S0 -> N9 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N4 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N9 [color="#03A9F4" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N11 [color="#000000" penwidth=1.5 style=solid label="implements disaster recovery" dir=forward]
+	S1 -> N12 [color="#03A9F4" penwidth=1.5 style=solid dir=forward]
+	N5 -> M0 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+	N1 -> M0 [color="#E57373" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N9 [color="#E57373" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/scanned_hard/diagrams_217.dot b/test/diagrams/scanned_hard/diagrams_217.dot
new file mode 100644
index 0000000000000000000000000000000000000000..54816d54f8eef6c23707e87fc057e168effd2260
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_217.dot
@@ -0,0 +1,38 @@
+digraph {
+	rankdir=TB
+	N0 [label="Agile Methodologies" color="#FF8A65" fillcolor="#FBE9E7" shape=predefinedprocess style=filled]
+	N1 [label="Version Control" color="#FF8A65" fillcolor="#FBE9E7" shape=rectangle style=filled]
+	N2 [label="Containerization" color="#A1D7CD" fillcolor="#EDF5F3" shape=diamond style=filled]
+	N3 [label="Technical Debt Management" color="#A1D7CD" fillcolor="#EDF5F3" shape=vnode_shape style=filled]
+	N4 [label="Deployment" color="#C2B2F0" fillcolor="#EFE6FF" shape=inputoutput style=filled]
+	N5 [label="Operating System Development" color="#A1D7CD" fillcolor="#EDF5F3" shape=parallelogram style=filled]
+	N6 [label="Game Development" color="#A1D7CD" fillcolor="#EDF5F3" shape=parallelogram style=filled]
+	N7 [label="Maintenance" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	S0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#FF8A65" fillcolor="#FBE9E7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Cloud_Native Development {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Cloud_Native Development"
+		nest0_0 [label="Algorithm Design" color="#A1D7CD" fillcolor="#EDF5F3" shape=rectangle style=filled]
+		nest0_1 [label="API Development" color="#A1D7CD" fillcolor="#EDF5F3" shape=rectangle style=filled]
+		nest0_2 [label="Frontend Development" color="#C2B2F0" fillcolor="#EFE6FF" shape=hexagon style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N2 -> N3 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#A1D7CD" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#FF8A65" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FF8A65" penwidth=1.5 style=solid label="ensures scalability" dir=forward]
+	nest0_0 -> nest0_1 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#C2B2F0" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N6 [color="#C2B2F0" penwidth=1.5 style=dashed label="integrates modules" dir=forward]
+	N3 -> S0 [color="#FF8A65" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N7 [color="#FF8A65" penwidth=1.5 style=solid label="designs algorithms" dir=forward]
+	S0 -> N5 [color="#A1D7CD" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	M0 -> N4 [color="#000000" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/scanned_hard/diagrams_260.dot b/test/diagrams/scanned_hard/diagrams_260.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d0498468e9493be236018a5669874ee52581fdac
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_260.dot
@@ -0,0 +1,86 @@
+digraph {
+	rankdir=LR
+	N0 [label="Payload Integration" color="#9C27B0" fillcolor="#E1BEE7" shape=parallelogram style=filled]
+	N1 [label="Astronaut Training" color="#9C27B0" fillcolor="#E1BEE7" shape=inputoutput style=filled]
+	N2 [label="Spacecraft Telemetry Analysis" color="#9C27B0" fillcolor="#E1BEE7" shape=inputoutput style=filled]
+	N3 [label="System Reboot" color="#6EB76D" fillcolor="#E9F7E8" shape=inputoutput style=filled]
+	N4 [label="Engine Overhaul" color="#6EB76D" fillcolor="#E9F7E8" shape=diamond style=filled]
+	N5 [label="Launch Execution" color="#6EB76D" fillcolor="#E9F7E8" shape=inputoutput style=filled]
+	N6 [label="Data Transmission" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+	N7 [label="Satellite Configuration" color="#9C27B0" fillcolor="#E1BEE7" shape=predefinedprocess style=filled]
+	N8 [label="Aviation Safety Audit" color="#6EB76D" fillcolor="#E9F7E8" shape=inputoutput style=filled]
+	N9 [label="Runway Inspection" color="#9C27B0" fillcolor="#E1BEE7" shape=rect style=filled]
+	N10 [label="Rocket Stage Separation" color="#AABEC6" fillcolor="#E0E6E9" shape=parallelogram style=filled]
+	N11 [label="Countdown Sequence" color="#AABEC6" fillcolor="#E0E6E9" shape=preparation style=filled]
+	N12 [label="Orbit Adjustment" color="#6EB76D" fillcolor="#E9F7E8" shape=vnode_shape style=filled]
+	N13 [label="International Space Station Resupply" color="#AABEC6" fillcolor="#E0E6E9" shape=diamond style=filled]
+	N14 [label="Emergency Protocols" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N15 [label="Launch Window Calculation" color="#AABEC6" fillcolor="#E0E6E9" shape=vnode_shape style=filled]
+	N16 [label="Structural Analysis" color="#9C27B0" fillcolor="#E1BEE7" shape=rectangle style=filled]
+	N17 [label="Space Debris Tracking" color="#9C27B0" fillcolor="#E1BEE7" shape=rectangle style=filled]
+	N18 [label="Hypersonic Flight Testing" color="#AABEC6" fillcolor="#E0E6E9" shape=hexagon style=filled]
+	N19 [label="Re_entry Vehicle Design" color="#9C27B0" fillcolor="#E1BEE7" shape=rectangle style=filled]
+	N20 [label="Flight Crew Training" color="#9C27B0" fillcolor="#E1BEE7" shape=predefinedprocess style=filled]
+	S0 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#6EB76D" fillcolor="#E9F7E8" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M2 [label="" color="#AABEC6" fillcolor="#E0E6E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Aircraft Manufacturing {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Aircraft Manufacturing"
+		nest0_0 [label="Aircraft Maintenance Log" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+		nest0_1 [label="Extravehicular Activity Planning" color="#6EB76D" fillcolor="#E9F7E8" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Airframe Assembly {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Airframe Assembly"
+		nest1_0 [label="New Material Development" color="#6EB76D" fillcolor="#E9F7E8" shape=database style=filled]
+		nest1_1 [label="Avionics Installation" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+	}
+	N0 -> N1 [color="#AABEC6" penwidth=1.5 style=solid label="coordinates" dir=forward]
+	N1 -> N2 [color="#9C27B0" penwidth=1.5 style=solid label="reboots" dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N5 -> N6 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#6EB76D" penwidth=1.5 style=dashed label="adjusts" dir=forward]
+	N11 -> N12 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	N13 -> N14 [color="#9C27B0" penwidth=1.5 style=solid label="transmits" dir=forward]
+	N14 -> N15 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N15 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N17 -> N18 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N18 -> N19 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N19 -> N20 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> nest0_0 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> N6 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#6EB76D" penwidth=1.5 style=solid label="launches" dir=forward]
+	N16 -> nest1_0 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N5 -> S0 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N16 -> S1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S1 -> N19 [color="#AABEC6" penwidth=1.5 style=solid label="designs" dir=forward]
+	S1 -> N18 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	S1 -> N20 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M0 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M0 [color="#6EB76D" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N4 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N3 -> M1 [color="#AABEC6" penwidth=1.5 style=solid dir=forward]
+	N0 -> M1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> M1 [color="#AABEC6" penwidth=1.5 style=dashed label="reports" dir=forward]
+	M1 -> N14 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N9 -> M2 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N11 -> M2 [color="#AABEC6" penwidth=1.5 style=dashed dir=forward]
+	M2 -> N13 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/scanned_hard/diagrams_272.dot b/test/diagrams/scanned_hard/diagrams_272.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3202b781d92a5811ad664c716bd2f35839d22eb0
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_272.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=BT
+	N0 [label="Embroidery and Embellishment" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Wholesale Distribution" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+	N2 [label="Marketing Campaign" color="#C0CA33" fillcolor="#F9FBE7" shape=preparation style=filled]
+	N3 [label="Haute Couture Creation" color="#388E3C" fillcolor="#F1F8E9" shape=multipledocuments style=filled]
+	N4 [label="Sustainable Fashion Practices" color="#C0CA33" fillcolor="#F9FBE7" shape=multipledocuments style=filled]
+	N5 [label="Footwear Production" color="#C0CA33" fillcolor="#F9FBE7" shape=document style=filled]
+	N6 [label="Intellectual Property Protection" color="#9C27B0" fillcolor="#E1BEE7" shape=rectangle style=filled]
+	N7 [label="E_commerce Management" color="#C0CA33" fillcolor="#F9FBE7" shape=rectangle style=filled]
+	N8 [label="Inventory Management" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N9 [label="Fashion Show Production" color="#9C27B0" fillcolor="#E1BEE7" shape=action style=filled]
+	N10 [label="Material Sourcing" color="#C0CA33" fillcolor="#F9FBE7" shape=database style=filled]
+	N11 [label="Customer Feedback Analysis" color="#388E3C" fillcolor="#F1F8E9" shape=rectangle style=filled]
+	N12 [label="Distribution" color="#9C27B0" fillcolor="#E1BEE7" shape=parallelogram style=filled]
+	N13 [label="Fabric Innovation" color="#388E3C" fillcolor="#F1F8E9" shape=database style=filled]
+	N14 [label="Sample Creation" color="#9C27B0" fillcolor="#E1BEE7" shape=predefinedprocess style=filled]
+	N15 [label="Quality Check" color="#9C27B0" fillcolor="#E1BEE7" shape=rectangle style=filled]
+	N16 [label="Custom Apparel Design" color="#9C27B0" fillcolor="#E1BEE7" shape=rectangle style=filled]
+	N17 [label="Seasonal Collection Planning" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N18 [label="Product Photography" color="#388E3C" fillcolor="#F1F8E9" shape=preparation style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#9C27B0" fillcolor="#E1BEE7" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#388E3C" fillcolor="#F1F8E9" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Influencer Collaboration {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Influencer Collaboration"
+		nest0_0 [label="Garment Production" color="#388E3C" fillcolor="#F1F8E9" shape=database style=filled]
+		nest0_1 [label="Brand Licensing" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	}
+	subgraph cluster_Pattern Making {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Pattern Making"
+		nest1_0 [label="Styling" color="#C0CA33" fillcolor="#F9FBE7" shape=rect style=filled]
+		nest1_1 [label="Color Palette Selection" color="#C0CA33" fillcolor="#F9FBE7" shape=action style=filled]
+		nest1_2 [label="Textile Manufacturing" color="#9C27B0" fillcolor="#E1BEE7" shape=diamond style=filled]
+	}
+	N0 -> N1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#9C27B0" penwidth=1.5 style=dashed label="trends" dir=forward]
+	N5 -> N6 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed label="optimizes" dir=forward]
+	N10 -> N11 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N13 -> N14 [color="#388E3C" penwidth=1.5 style=solid label="promotes" dir=forward]
+	N14 -> N15 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N15 -> N16 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	N16 -> N17 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N17 -> N18 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N13 -> nest0_0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_1 -> N7 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#C0CA33" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N4 -> nest1_0 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	nest1_2 -> N10 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N15 -> S0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N18 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S0 -> N17 [color="#9C27B0" penwidth=1.5 style=dashed label="inspects" dir=forward]
+	N3 -> S1 [color="#388E3C" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N12 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	S1 -> N14 [color="#C0CA33" penwidth=1.5 style=dashed label="designs" dir=forward]
+	N2 -> M0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> M0 [color="#388E3C" penwidth=1.5 style=solid dir=forward]
+	M0 -> N7 [color="#C0CA33" penwidth=1.5 style=dashed dir=forward]
+	N1 -> M1 [color="#9C27B0" penwidth=1.5 style=dashed dir=forward]
+	N12 -> M1 [color="#9C27B0" penwidth=1.5 style=solid dir=forward]
+	M1 -> N16 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/scanned_hard/diagrams_274.txt b/test/diagrams/scanned_hard/diagrams_274.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bce83018eb42e97980b7d62c15dbc965b43328db
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_274.txt
@@ -0,0 +1,27 @@
+<AI in Recruitment, connectedTo, Candidate Tracking>
+<AI in Recruitment, connectedTo, Employee Referral Program>
+<AI in Recruitment, connectedTo, Employer Branding>
+<AI in Recruitment, connectedTo, Talent Pipeline Building>
+<Applicant Tracking System Management, connectedTo, Candidate Experience Management>
+<Applicant Tracking System Management, connectedTo, Social Recruiting>
+<Candidate Experience Management, connectedTo, Employer Branding>
+<Candidate Experience Management, connectedTo, Headhunting>
+<Candidate Experience Management, connectedTo, Internal Mobility>
+<Candidate Experience Management, optimizes, Global Recruitment Strategy>
+<Candidate Screening, connectedTo, Employee Referral Program>
+<Candidate Tracking, advertises, Employer Branding>
+<Candidate Tracking, connectedTo, Interview Panel Coordination>
+<Employer Branding, connectedTo, Candidate Screening>
+<Executive Search, connectedTo, Social Recruiting>
+<Global Recruitment Strategy, connectedTo, Headhunting>
+<Global Recruitment Strategy, connectedTo, Job Description Creation>
+<Headhunting, educates, AI in Recruitment>
+<Internal Mobility, connectedTo, AI in Recruitment>
+<Interview Panel Coordination, connectedTo, Internal Mobility>
+<Job Description Creation, connectedTo, Temporary Staffing>
+<Negotiation, consults, Executive Search>
+<Recruiter Training, connectedTo, Candidate Tracking>
+<Social Recruiting, connectedTo, Applicant Tracking System Management>
+<Social Recruiting, tests, Headhunting>
+<Talent Pipeline Building, connectedTo, Recruiter Training>
+<Temporary Staffing, connectedTo, Candidate Tracking>
diff --git a/test/diagrams/scanned_hard/diagrams_286.txt b/test/diagrams/scanned_hard/diagrams_286.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a73c6735953841c1ab1d6799533151e7b2e8112b
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_286.txt
@@ -0,0 +1,36 @@
+<Anesthesia Administration, connectedTo, Medical Treatment>
+<Anesthesia Administration, partOf, Anesthesia Administration>
+<Biosecurity Measures, connectedTo, Equine Care>
+<Dental Care, connectedTo, Equine Care>
+<Dental Care, connectedTo, Laboratory Testing>
+<Diagnosis, connectedTo, Laboratory Testing>
+<Diagnosis, connectedTo, Pharmacy Management>
+<Diagnosis, connectedTo, Vaccination>
+<Equine Care, inspects, Toxicology Testing>
+<Farm Animal Health Management, recommends, Public Health Vet Services>
+<Herd Health Programs, connectedTo, Farm Animal Health Management>
+<Hospice Care for Animals, connectedTo, Animal Sheltering Consultation>
+<Imaging Services, connectedTo, Livestock Disease Prevention>
+<Laboratory Testing, connectedTo, Equine Care>
+<Laboratory Testing, connectedTo, Parasite Control>
+<Laboratory Testing, connectedTo, Sterilization Protocols>
+<Livestock Disease Prevention, connectedTo, Hospice Care for Animals>
+<Medical Treatment, partOf, Medical Treatment>
+<Medical Treatment, tests, Equine Care>
+<Nutritional Counseling, regulates, Biosecurity Measures>
+<Parasite Control, connectedTo, Anesthesia Administration>
+<Parasite Control, partOf, Parasite Control>
+<Pet Check_up, connectedTo, Diagnosis>
+<Pet Check_up, connectedTo, Laboratory Testing>
+<Pharmacy Management, connectedTo, Dental Care>
+<Pharmacy Management, connectedTo, Equine Care>
+<Public Health Vet Services, connectedTo, Animal Sheltering Consultation>
+<Public Health Vet Services, connectedTo, Hospice Care for Animals>
+<Public Health Vet Services, connectedTo, Imaging Services>
+<Public Health Vet Services, connectedTo, Livestock Disease Prevention>
+<Sterilization Protocols, connectedTo, Farm Animal Health Management>
+<Sterilization Protocols, connectedTo, Imaging Services>
+<Sterilization Protocols, operates, Nutritional Counseling>
+<Surgery, connectedTo, Public Health Vet Services>
+<Toxicology Testing, connectedTo, Herd Health Programs>
+<Vaccination, dresses, Surgery>
diff --git a/test/diagrams/scanned_hard/diagrams_317.txt b/test/diagrams/scanned_hard/diagrams_317.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2c0e15c982ff561ba12fab5c3e54b341accbf26b
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_317.txt
@@ -0,0 +1,26 @@
+<Algorithm Updates Monitoring, connectedTo, Knowledge Graph Integration>
+<Core Web Vitals Optimization, connectedTo, Schema Markup Implementation>
+<Crawling Websites, connectedTo, Keyword Research>
+<Crawling Websites, connectedTo, Shopping Search>
+<Featured Snippets Optimization, connectedTo, Video Search>
+<Keyword Research, connectedTo, Ranking Algorithms>
+<Knowledge Graph Integration, uses semantics, Shopping Search>
+<Mobile_First Indexing, connectedTo, Core Web Vitals Optimization>
+<Mobile_First Indexing, connectedTo, Crawling Websites>
+<Mobile_First Indexing, connectedTo, Keyword Research>
+<Mobile_First Indexing, connectedTo, Schema Markup Implementation>
+<Mobile_First Indexing, connectedTo, Semantic Search>
+<Query Processing, connectedTo, Crawling Websites>
+<Ranking Algorithms, connectedTo, Technical SEO>
+<Schema Markup Implementation, connectedTo, Keyword Research>
+<Schema Markup Implementation, connectedTo, Ranking Algorithms>
+<Schema Markup Implementation, connectedTo, Technical SEO>
+<Search Engine Marketing Strategy, connectedTo, Mobile_First Indexing>
+<Search Engine Marketing Strategy, processes queries, Keyword Research>
+<Semantic Search, connectedTo, Algorithm Updates Monitoring>
+<Shopping Search, connectedTo, Core Web Vitals Optimization>
+<Shopping Search, connectedTo, Featured Snippets Optimization>
+<Shopping Search, connectedTo, Keyword Research>
+<Shopping Search, connectedTo, Ranking Algorithms>
+<Shopping Search, connectedTo, Technical SEO>
+<Video Search, connectedTo, Query Processing>
diff --git a/test/diagrams/scanned_hard/diagrams_326.txt b/test/diagrams/scanned_hard/diagrams_326.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9ae672a196c031990e8fa43aaad4435e48718dc4
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_326.txt
@@ -0,0 +1,30 @@
+<Alternative Therapies, connectedTo, Mindfulness Practice>
+<Aromatherapy Usage, connectedTo, Immune System Support>
+<Aromatherapy Usage, connectedTo, Journaling for Wellness>
+<Behavior Change Support, connectedTo, Community Wellness Programs>
+<Biofeedback Training, connectedTo, Aromatherapy Usage>
+<Burnout Prevention, connectedTo, Proactive Health Management>
+<Community Wellness Programs, connectedTo, Social Connection Enhancement>
+<Employee Wellness Programs, connectedTo, Journaling for Wellness>
+<Employee Wellness Programs, connectedTo, Work_Life Balance Coaching>
+<Holistic Health Assessment, connectedTo, Biofeedback Training>
+<Immune System Support, connectedTo, Employee Wellness Programs>
+<Immune System Support, connectedTo, Physical Activity Planning>
+<Immune System Support, connectedTo, Stress Management>
+<Journaling for Wellness, connectedTo, Stress Management>
+<Meditation Coaching, connectedTo, Behavior Change Support>
+<Mindfulness Practice, connectedTo, Physical Activity Planning>
+<Nutrition Guidance, connectedTo, Holistic Health Assessment>
+<Physical Activity Planning, connectedTo, Burnout Prevention>
+<Physical Activity Planning, connectedTo, Employee Wellness Programs>
+<Physical Activity Planning, connectedTo, Journaling for Wellness>
+<Physical Activity Planning, connectedTo, Stress Management>
+<Positive Psychology Application, connectedTo, Community Wellness Programs>
+<Positive Psychology Application, connectedTo, Meditation Coaching>
+<Proactive Health Management, connectedTo, Alternative Therapies>
+<Social Connection Enhancement, connectedTo, Biofeedback Training>
+<Wellness Retreat Planning, connectedTo, Community Wellness Programs>
+<Wellness Retreat Planning, connectedTo, Journaling for Wellness>
+<Wellness Retreat Planning, connectedTo, Physical Activity Planning>
+<Wellness Retreat Planning, connectedTo, Positive Psychology Application>
+<Work_Life Balance Coaching, connectedTo, Nutrition Guidance>
diff --git a/test/diagrams/scanned_hard/diagrams_336.txt b/test/diagrams/scanned_hard/diagrams_336.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1df9f6acb5b687f8ca0b4652a11563e745e61d2c
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_336.txt
@@ -0,0 +1,29 @@
+<Bias Mitigation, connectedTo, Citation Management>
+<Citation Management, connectedTo, Data Management Plan>
+<Data Analysis, connectedTo, Grant Proposal Writing>
+<Data Management Plan, connectedTo, Open Science Practices>
+<Grant Proposal Writing, connectedTo, Data Management Plan>
+<Journal Publication, connectedTo, Systematic Review>
+<Methodology Selection, connectedTo, Data Analysis>
+<Methodology Selection, connectedTo, Survey Design>
+<Methodology Selection, connectedTo, Thesis or Dissertation Writing>
+<Open Science Practices, connectedTo, Plagiarism Detection>
+<Open Science Practices, connectedTo, Poster Session Preparation>
+<Poster Session Preparation, connectedTo, Reproducibility Studies>
+<Public Engagement with Research, connectedTo, Bias Mitigation>
+<Reproducibility Studies, connectedTo, Thesis or Dissertation Writing>
+<Research Impact Assessment, connectedTo, Public Engagement with Research>
+<Survey Design, connectedTo, Thesis or Dissertation Writing>
+<Systematic Review, connectedTo, Data Analysis>
+<Systematic Review, connectedTo, Data Management Plan>
+<Systematic Review, connectedTo, Grant Proposal Writing>
+<Systematic Review, connectedTo, Plagiarism Detection>
+<Systematic Review, connectedTo, Research Impact Assessment>
+<Systematic Review, connectedTo, Theory Development>
+<Theory Development, connectedTo, Data Analysis>
+<Theory Development, connectedTo, Data Management Plan>
+<Theory Development, connectedTo, Grant Proposal Writing>
+<Thesis or Dissertation Writing, connectedTo, Data Analysis>
+<Thesis or Dissertation Writing, connectedTo, Journal Publication>
+<Variable Identification, connectedTo, Methodology Selection>
+<Variable Identification, connectedTo, Thesis or Dissertation Writing>
diff --git a/test/diagrams/scanned_hard/diagrams_338.txt b/test/diagrams/scanned_hard/diagrams_338.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ae872f7228f58565ed7970687daf4375f9a4d4b9
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_338.txt
@@ -0,0 +1,36 @@
+<Acquisition and Accessioning, complies, Public Access Systems>
+<Acquisition and Accessioning, describes, Security of Holdings>
+<Appraisal and Selection, connectedTo, Collection Management Policy>
+<Appraisal and Selection, connectedTo, Data Migration for Digital Archives>
+<Appraisal and Selection, connectedTo, Legal and Ethical Compliance>
+<Archival Advocacy, connectedTo, Disaster Preparedness for Archives>
+<Collection Management Policy, connectedTo, Serialization and Item Control>
+<Conservation Treatment, connectedTo, Security of Holdings>
+<Data Migration for Digital Archives, connectedTo, Conservation Treatment>
+<Digital Asset Management, connectedTo, Long_Term Digital Preservation>
+<Digital Forensics for Archives, connectedTo, Appraisal and Selection>
+<Disaster Preparedness for Archives, connectedTo, Digital Asset Management>
+<Emulation for Obsolete Formats, connectedTo, Digital Forensics for Archives>
+<Emulation for Obsolete Formats, connectedTo, Security of Holdings>
+<Environmental Control, connectedTo, Outreach and Education>
+<Ethical Use of Archival Materials, connectedTo, User Interface for Digital Archives>
+<Grant Writing for Archives, connectedTo, Records Management Integration>
+<Long_Term Digital Preservation, connectedTo, Emulation for Obsolete Formats>
+<Metadata Creation, connectedTo, Acquisition and Accessioning>
+<Outreach and Education, connectedTo, Researchers Support>
+<Preservation Planning, connectedTo, Environmental Control>
+<Public Access Systems, connectedTo, Conservation Treatment>
+<Public Access Systems, connectedTo, Researchers Support>
+<Records Management Integration, connectedTo, Collection Management Policy>
+<Records Management Integration, connectedTo, Legal and Ethical Compliance>
+<Records Management Integration, connectedTo, Serialization and Item Control>
+<Researchers Support, connectedTo, Security of Holdings>
+<Researchers Support, governs, Ethical Use of Archival Materials>
+<Security of Holdings, connectedTo, Archival Advocacy>
+<Security of Holdings, connectedTo, Grant Writing for Archives>
+<Serialization and Item Control, connectedTo, Legal and Ethical Compliance>
+<Subject Indexing for Archives, connectedTo, Conservation Treatment>
+<Subject Indexing for Archives, connectedTo, Metadata Creation>
+<User Interface for Digital Archives, connectedTo, Conservation Treatment>
+<User Interface for Digital Archives, connectedTo, Long_Term Digital Preservation>
+<User Interface for Digital Archives, connectedTo, Preservation Planning>
diff --git a/test/diagrams/scanned_hard/diagrams_342.dot b/test/diagrams/scanned_hard/diagrams_342.dot
new file mode 100644
index 0000000000000000000000000000000000000000..90605666e5438553eac5aa70a4e7f377334aaf29
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_342.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=LR
+	N0 [label="Risk_Based Security Measures" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N1 [label="Insider Threat Programs" color="#A1887F" fillcolor="#EFEBE9" shape=action style=filled]
+	N2 [label="Transportation Security" color="#4DB6AC" fillcolor="#E0F2F1" shape=preparation style=filled]
+	N3 [label="Legislation and Policy Development" color="#A1887F" fillcolor="#EFEBE9" shape=rectangle style=filled]
+	N4 [label="Biometric Screening" color="#A1887F" fillcolor="#EFEBE9" shape=rectangle style=filled]
+	N5 [label="Terrorism Financing Interdiction" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N6 [label="Data Analytics for Terrorism" color="#BCB88A" fillcolor="#F5F5DC" shape=document style=filled]
+	N7 [label="Radicalization Prevention" color="#4DB6AC" fillcolor="#E0F2F1" shape=database style=filled]
+	N8 [label="Hostage Negotiation" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N9 [label="Post_Incident Recovery" color="#4DB6AC" fillcolor="#E0F2F1" shape=multipledocuments style=filled]
+	N10 [label="Intelligence Analysis" color="#A1887F" fillcolor="#EFEBE9" shape=parallelogram style=filled]
+	N11 [label="Emergency Preparedness" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N12 [label="Threat Assessment" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N13 [label="Target Hardening" color="#A1887F" fillcolor="#EFEBE9" shape=document style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#4DB6AC" fillcolor="#E0F2F1" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#BCB88A" fillcolor="#F5F5DC" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Port Security {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Port Security"
+		nest0_0 [label="Psychological Operations" color="#BCB88A" fillcolor="#F5F5DC" shape=rect style=filled]
+		nest0_1 [label="Risk Analysis" color="#4DB6AC" fillcolor="#E0F2F1" shape=rectangle style=filled]
+		nest0_2 [label="International Cooperation" color="#4DB6AC" fillcolor="#E0F2F1" shape=predefinedprocess style=filled]
+		nest0_3 [label="Behavioral Threat Assessment" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	}
+	subgraph cluster_Surveillance and Monitoring {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Surveillance and Monitoring"
+		nest1_0 [label="Military Counterterrorism" color="#BCB88A" fillcolor="#F5F5DC" shape=action style=filled]
+		nest1_1 [label="Counter_Propaganda" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest1_2 [label="Public Awareness Campaigns" color="#4DB6AC" fillcolor="#E0F2F1" shape=rectangle style=filled]
+		nest1_3 [label="Training Exercises" color="#A1887F" fillcolor="#EFEBE9" shape=inputoutput style=filled]
+	}
+	N0 -> N1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N1 -> N2 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> N10 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N11 -> N12 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	N12 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest0_0 -> nest0_1 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#A1887F" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> nest0_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest0_0 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	nest0_3 -> N6 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_0 -> nest1_1 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest1_1 -> nest1_2 [color="#A1887F" penwidth=1.5 style=solid dir=forward]
+	nest1_2 -> nest1_3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N9 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_3 -> N2 [color="#000000" penwidth=1.5 style=solid label="intelligence_gathers" dir=forward]
+	N10 -> S0 [color="#4DB6AC" penwidth=1.5 style=solid dir=forward]
+	S0 -> N12 [color="#BCB88A" penwidth=1.5 style=solid dir=forward]
+	S0 -> N13 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N2 -> S1 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N13 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N6 -> M1 [color="#BCB88A" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N11 [color="#4DB6AC" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/scanned_hard/diagrams_343.txt b/test/diagrams/scanned_hard/diagrams_343.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bfb8a485ddd9b7a3d102ec203af6aa9a6418cfa6
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_343.txt
@@ -0,0 +1,40 @@
+<Anomaly Detection, connectedTo, Environmental Monitoring>
+<Automated Threat Detection, connectedTo, Data Collection>
+<Automated Threat Detection, connectedTo, Facial Recognition Systems>
+<Biometric Data Analysis, complies, Predictive Policing>
+<Biometric Data Analysis, connectedTo, Anomaly Detection>
+<Biometric Data Analysis, connectedTo, Traffic Surveillance>
+<Border Surveillance, connectedTo, Biometric Data Analysis>
+<Border Surveillance, connectedTo, Data Collection>
+<Border Surveillance, connectedTo, Privacy Concerns Mitigation>
+<Border Surveillance, connectedTo, Sensor Network Deployment>
+<Border Surveillance, connectedTo, Wildlife Tracking>
+<Border Surveillance, shares, Real_time Alerts>
+<Cyber Surveillance, observes, Industrial Surveillance>
+<Data Collection, connectedTo, Privacy Concerns Mitigation>
+<Environmental Monitoring, connectedTo, Intrusion Detection>
+<Ethical Guidelines, blocks, Mobile Phone Interception>
+<Facial Recognition Systems, connectedTo, Perimeter Security>
+<Industrial Surveillance, connectedTo, Satellite Imaging>
+<Internet Traffic Monitoring, connectedTo, Physical Security Integration>
+<Intrusion Detection, connectedTo, Data Collection>
+<Intrusion Detection, connectedTo, Ethical Guidelines>
+<Mobile Phone Interception, connectedTo, Data Collection>
+<Night Vision Technology, accesses, Sensor Network Deployment>
+<Night Vision Technology, connectedTo, Anomaly Detection>
+<Perimeter Security, connectedTo, Anomaly Detection>
+<Perimeter Security, connectedTo, Cyber Surveillance>
+<Perimeter Security, connectedTo, Real_time Alerts>
+<Physical Security Integration, connectedTo, Security Personnel Operations>
+<Predictive Policing, connectedTo, Anomaly Detection>
+<Real_time Alerts, connectedTo, Thermal Imaging>
+<Satellite Imaging, connectedTo, Sensor Network Deployment>
+<Security Personnel Operations, audits, Privacy Concerns Mitigation>
+<Sensor Network Deployment, connectedTo, Anomaly Detection>
+<Sensor Network Deployment, connectedTo, Automated Threat Detection>
+<Sensor Network Deployment, connectedTo, Internet Traffic Monitoring>
+<Thermal Imaging, connectedTo, Biometric Data Analysis>
+<Traffic Surveillance, connectedTo, Predictive Policing>
+<Wildlife Tracking, connectedTo, Ethical Guidelines>
+<Wildlife Tracking, connectedTo, Night Vision Technology>
+<Wildlife Tracking, connectedTo, Thermal Imaging>
diff --git a/test/diagrams/scanned_hard/diagrams_344.dot b/test/diagrams/scanned_hard/diagrams_344.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8aa5801f719dd0246eae2c0c54f34806e375aae4
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_344.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=LR
+	N0 [label="Drug Prevention Initiatives" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+	N1 [label="Early Intervention Programs" color="#CD8FF2" fillcolor="#ECCFF5" shape=vnode_shape style=filled]
+	N2 [label="Victim Support Services" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+	N3 [label="Crime Prevention Through Education" color="#CD8FF2" fillcolor="#ECCFF5" shape=vnode_shape style=filled]
+	N4 [label="Public Awareness Campaigns" color="#CD8FF2" fillcolor="#ECCFF5" shape=document style=filled]
+	N5 [label="Domestic Violence Prevention" color="#CD8FF2" fillcolor="#ECCFF5" shape=vnode_shape style=filled]
+	N6 [label="Gang Intervention" color="#F44336" fillcolor="#FFCDD2" shape=action style=filled]
+	N7 [label="Technology for Prevention" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N8 [label="Hotspot Policing" color="#94C0C0" fillcolor="#CADEDE" shape=inputoutput style=filled]
+	N9 [label="Mediation Services" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N10 [label="Youth Programs" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+	N11 [label="Cybercrime Prevention" color="#94C0C0" fillcolor="#CADEDE" shape=rect style=filled]
+	S0 [label="" color="#F44336" fillcolor="#FFCDD2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S1 [label="" color="#94C0C0" fillcolor="#CADEDE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	S2 [label="" color="#94C0C0" fillcolor="#CADEDE" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M0 [label="" color="#F44336" fillcolor="#FFCDD2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	M1 [label="" color="#F44336" fillcolor="#FFCDD2" shape=circle style=filled fixedsize=true height=0.1 width=0.1]
+	subgraph cluster_Restorative Justice {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Restorative Justice"
+		nest0_0 [label="Sexual Assault Prevention" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest0_1 [label="Security Lighting" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+		nest0_2 [label="Patrol Operations" color="#CD8FF2" fillcolor="#ECCFF5" shape=inputoutput style=filled]
+	}
+	subgraph cluster_Behavioral Science in Prevention {
+		style="rounded,filled,dashed"
+		color=gray50
+		label="Behavioral Science in Prevention"
+		nest1_0 [label="Robbery Prevention" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+		nest1_1 [label="Police_Community Relations" color="#F44336" fillcolor="#FFCDD2" shape=multipledocuments style=filled]
+	}
+	N0 -> N1 [color="#F44336" penwidth=1.5 style=dashed label="predicts" dir=forward]
+	N1 -> N2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N3 -> N4 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N4 -> N5 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	N7 -> N8 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N8 -> N9 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	N9 -> N10 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N10 -> N11 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	nest0_0 -> nest0_1 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	nest0_1 -> nest0_2 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N9 -> nest0_0 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	nest0_2 -> N3 [color="#F44336" penwidth=1.5 style=solid dir=forward]
+	nest1_0 -> nest1_1 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	N2 -> nest1_0 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	nest1_1 -> N9 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N7 -> S0 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	S0 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S0 -> N11 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N3 -> S1 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N5 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N9 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	S1 -> N8 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	S1 -> N6 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N2 -> S2 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	S2 -> N9 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	S2 -> N10 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+	N8 -> M0 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N2 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N0 -> M0 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> M0 [color="#94C0C0" penwidth=1.5 style=dashed dir=forward]
+	M0 -> N11 [color="#94C0C0" penwidth=1.5 style=solid dir=forward]
+	N1 -> M1 [color="#F44336" penwidth=1.5 style=dashed dir=forward]
+	N0 -> M1 [color="#CD8FF2" penwidth=1.5 style=dashed dir=forward]
+	N2 -> M1 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	M1 -> N5 [color="#CD8FF2" penwidth=1.5 style=solid dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/scanned_hard/diagrams_42.dot b/test/diagrams/scanned_hard/diagrams_42.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c6a66e7df1ee7a137d36e51833290093dcec7b4e
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_42.dot
@@ -0,0 +1,26 @@
+digraph {
+	rankdir=BT
+	N0 [label="Landfill Operation" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N1 [label="Waste_to_Energy Conversion" color="#73C6BC" fillcolor="#D0EFEE" shape=preparation style=filled]
+	N2 [label="Electronic Waste Recycling" color="#FFF8A6" fillcolor="#FFFDE0" shape=action style=filled]
+	N3 [label="Anaerobic Digestion" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N4 [label="Waste Logistics Optimization" color="#FFF8A6" fillcolor="#FFFDE0" shape=multipledocuments style=filled]
+	N5 [label="Waste Compaction" color="#FFF8A6" fillcolor="#FFFDE0" shape=rect style=filled]
+	N6 [label="Biomedical Waste Handling" color="#FFF8A6" fillcolor="#FFFDE0" shape=action style=filled]
+	N7 [label="Waste Audit" color="#D2D2D2" fillcolor="#F0F0F0" shape=predefinedprocess style=filled]
+	N8 [label="Landfill Gas Collection" color="#FFF8A6" fillcolor="#FFFDE0" shape=predefinedprocess style=filled]
+	N9 [label="Hazardous Waste Disposal" color="#73C6BC" fillcolor="#D0EFEE" shape=database style=filled]
+	N10 [label="Organics Collection" color="#73C6BC" fillcolor="#D0EFEE" shape=inputoutput style=filled]
+	N0 -> N1 [color="#D2D2D2" penwidth=1.5 style=dashed label="extracts" dir=forward]
+	N1 -> N2 [color="#D2D2D2" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#73C6BC" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N5 [color="#000000" penwidth=1.5 style=solid label="designs" dir=forward]
+	N5 -> N6 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#D2D2D2" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#000000" penwidth=1.5 style=dashed dir=forward]
+	N8 -> N9 [color="#FFF8A6" penwidth=1.5 style=dashed label="disposes" dir=forward]
+	N9 -> N10 [color="#D2D2D2" penwidth=1.5 style=solid label="transports" dir=forward]
+	N3 -> N2 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N6 -> N1 [color="#73C6BC" penwidth=1.5 style=dashed label="innovates" dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/scanned_hard/diagrams_6.txt b/test/diagrams/scanned_hard/diagrams_6.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a94cb4b9f106ef4a9098ec8606b0e1b22f750c1f
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_6.txt
@@ -0,0 +1,12 @@
+<Arrival, connectedTo, Weather Impact Assessment>
+<Driver Allocation, connectedTo, Accident Reconstruction>
+<Driver Allocation, connectedTo, Incident Report>
+<Electric Vehicle Charging, connectedTo, Driver Allocation>
+<Incident Report, permits, Vehicle Tracking>
+<Intermodal Transfer, tracks, Schedule Generation>
+<Navigation Update, surveys, Electric Vehicle Charging>
+<Road Network Management, navigates, Route Diversion>
+<Route Diversion, maintains, Arrival>
+<Schedule Generation, unloads, Navigation Update>
+<Vehicle Tracking, diversifies, Intermodal Transfer>
+<Weather Impact Assessment, manages, Incident Report>
diff --git a/test/diagrams/scanned_hard/diagrams_61.dot b/test/diagrams/scanned_hard/diagrams_61.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ee2b3f568ee2795c3781ddd2ae0dd2284a7a2713
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_61.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=BT
+	N0 [label="Data Transformation" color="#82DAFF" fillcolor="#C8EDFF" shape=inputoutput style=filled]
+	N1 [label="Risk Analytics" color="#82DAFF" fillcolor="#C8EDFF" shape=database style=filled]
+	N2 [label="Social Media Analytics" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N3 [label="Data Collection" color="#C2B2F0" fillcolor="#EFE6FF" shape=predefinedprocess style=filled]
+	N4 [label="Statistical Modeling" color="#82DAFF" fillcolor="#C8EDFF" shape=action style=filled]
+	N5 [label="Healthcare Data Analysis" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N6 [label="Time Series Forecasting" color="#82DAFF" fillcolor="#C8EDFF" shape=action style=filled]
+	N7 [label="Data Pipeline Development" color="#795548" fillcolor="#D7CCC8" shape=document style=filled]
+	N8 [label="Prescriptive Analytics" color="#C2B2F0" fillcolor="#EFE6FF" shape=predefinedprocess style=filled]
+	N0 -> N1 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N1 -> N2 [color="#795548" penwidth=1.5 style=solid label="forecasts" dir=forward]
+	N2 -> N3 [color="#000000" penwidth=1.5 style=solid label="collects" dir=forward]
+	N3 -> N4 [color="#C2B2F0" penwidth=1.5 style=dashed label="correlates" dir=forward]
+	N4 -> N5 [color="#82DAFF" penwidth=1.5 style=dashed dir=forward]
+	N5 -> N6 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N6 -> N7 [color="#000000" penwidth=1.5 style=solid dir=forward]
+	N7 -> N8 [color="#C2B2F0" penwidth=1.5 style=solid dir=forward]
+	N3 -> N0 [color="#C2B2F0" penwidth=1.5 style=dashed label="educates" dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/scanned_hard/diagrams_63.txt b/test/diagrams/scanned_hard/diagrams_63.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a172fa7c5402621e89c6218e203e891a61f66c8d
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_63.txt
@@ -0,0 +1,10 @@
+<Brand Strategy Development, direct mail, Customer Segmentation>
+<Campaign Performance Tracking, automates tasks, Remarketing Campaigns>
+<Customer Segmentation, connectedTo, Event Marketing>
+<Distribution Channel Management, handles PR, Brand Strategy Development>
+<Email Marketing, forms partnerships, Guerilla Marketing>
+<Event Marketing, connectedTo, Distribution Channel Management>
+<Guerilla Marketing, connectedTo, Campaign Performance Tracking>
+<Guerilla Marketing, creates content, Customer Segmentation>
+<Influencer Marketing, connectedTo, Event Marketing>
+<Remarketing Campaigns, guerilla marketing, Influencer Marketing>
diff --git a/test/diagrams/scanned_hard/diagrams_67.txt b/test/diagrams/scanned_hard/diagrams_67.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9fe385200e97d5ebe34cb7ef79fb4eae6b6cc422
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_67.txt
@@ -0,0 +1,8 @@
+<Equity Crowdfunding, collects donations, Video Production for Campaigns>
+<Equity Crowdfunding, connectedTo, Shareholder Management>
+<Manufacturing Planning, ensures compliance, Pitch Deck Preparation>
+<Marketing Strategy, produces content, Social Media Promotion>
+<Pitch Deck Preparation, connectedTo, Video Production for Campaigns>
+<Shareholder Management, connectedTo, Marketing Strategy>
+<Social Media Promotion, manages fees, Securities Regulations Adherence>
+<Video Production for Campaigns, connectedTo, Equity Crowdfunding>
diff --git a/test/diagrams/scanned_hard/diagrams_68.txt b/test/diagrams/scanned_hard/diagrams_68.txt
new file mode 100644
index 0000000000000000000000000000000000000000..878f81c045e1a12b001eb994b1e0ec29b4d78d71
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_68.txt
@@ -0,0 +1,9 @@
+<Compliance with IoT Regulations, analyzes insights, Power Management for Devices>
+<Compliance with IoT Regulations, connectedTo, Smart Manufacturing>
+<Data Analysis in Cloud, connectedTo, Network Protocol Selection>
+<IoT Device Certification, connectedTo, Power Management for Devices>
+<Network Protocol Selection, integrates sensors, Asset Tracking>
+<Power Management for Devices, develops solutions, Data Analysis in Cloud>
+<Predictive Maintenance, uses blockchain, Real_time Data Streaming>
+<Real_time Data Streaming, connectedTo, Compliance with IoT Regulations>
+<Smart Manufacturing, prototypes devices, IoT Device Certification>
diff --git a/test/diagrams/scanned_hard/diagrams_79.dot b/test/diagrams/scanned_hard/diagrams_79.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ddbd6be1b2f0aeb06b3249e13d594473f32e84f8
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_79.dot
@@ -0,0 +1,20 @@
+digraph {
+	rankdir=LR
+	N0 [label="Virtual Classroom Facilitation" color="#3F51B5" fillcolor="#C5CAE9" shape=preparation style=filled]
+	N1 [label="Synchronous Learning" color="#3F51B5" fillcolor="#C5CAE9" shape=predefinedprocess style=filled]
+	N2 [label="Technical Support for Students" color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N3 [label="Test Preparation Courses" color="#3F51B5" fillcolor="#C5CAE9" shape=vnode_shape style=filled]
+	N4 [label="Instructor Training" color="#3F51B5" fillcolor="#C5CAE9" shape=preparation style=filled]
+	N5 [label="Accreditation Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=document style=filled]
+	N6 [label="Certification Issuance" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+	N7 [label="Virtual Field Trips" color="#673AB7" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N0 -> N1 [color="#673AB7" penwidth=1.5 style=solid label="uses machine learning" dir=forward]
+	N1 -> N2 [color="#FFF8A6" penwidth=1.5 style=dashed dir=forward]
+	N2 -> N3 [color="#FFF8A6" penwidth=1.5 style=solid dir=forward]
+	N3 -> N4 [color="#673AB7" penwidth=1.5 style=dashed label="applies learning design" dir=forward]
+	N4 -> N5 [color="#673AB7" penwidth=1.5 style=solid label="uses adaptive systems" dir=forward]
+	N5 -> N6 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+	N6 -> N7 [color="#FFF8A6" penwidth=1.5 style=dashed label="trains educators" dir=forward]
+	N2 -> N1 [color="#673AB7" penwidth=1.5 style=dashed dir=forward]
+	N4 -> N0 [color="#3F51B5" penwidth=1.5 style=dashed dir=forward]
+}
\ No newline at end of file
diff --git a/test/diagrams/scanned_hard/diagrams_84.txt b/test/diagrams/scanned_hard/diagrams_84.txt
new file mode 100644
index 0000000000000000000000000000000000000000..87c65e204a0071f68f6a869e606fd66e32c238bb
--- /dev/null
+++ b/test/diagrams/scanned_hard/diagrams_84.txt
@@ -0,0 +1,9 @@
+<Eating Habit Modification, connectedTo, Grocery Shopping Guidance>
+<Food Fortification Strategies, calculates, Nutrigenomics Research>
+<Grocery Shopping Guidance, identifies, Micronutrient Analysis>
+<Inflammation and Diet, connectedTo, Food Fortification Strategies>
+<Inflammation and Diet, cooks, Nutrigenomics Research>
+<Micronutrient Analysis, connectedTo, Food Fortification Strategies>
+<Micronutrient Analysis, measures, Inflammation and Diet>
+<Nutrigenomics Research, counsels, Restaurant Menu Analysis>
+<Supplement Recommendation, connectedTo, Eating Habit Modification>
diff --git a/test/mermaid/hard/mermaid_1.png b/test/mermaid/hard/mermaid_1.png
new file mode 100644
index 0000000000000000000000000000000000000000..4ef2a8d6d12d67b61e2cded071f56fc0f1160671
--- /dev/null
+++ b/test/mermaid/hard/mermaid_1.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:bc6cd7502f240fdffbfc022fe76e28d7e59090ed664f3a4c7571e383cf74354f
+size 255339
diff --git a/test/mermaid/hard/mermaid_101.png b/test/mermaid/hard/mermaid_101.png
new file mode 100644
index 0000000000000000000000000000000000000000..988829debcaf0dc48992e89974be2d48ecdaa555
--- /dev/null
+++ b/test/mermaid/hard/mermaid_101.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9f552d09523e56cc2bc4653530192287512aba08709e46d0c478b4edaee111d9
+size 345704
diff --git a/test/mermaid/hard/mermaid_102.png b/test/mermaid/hard/mermaid_102.png
new file mode 100644
index 0000000000000000000000000000000000000000..59035c986e2289d12a1e6d6af90917f3f0d7d8a5
--- /dev/null
+++ b/test/mermaid/hard/mermaid_102.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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diff --git a/test/mermaid/hard/mermaid_103.png b/test/mermaid/hard/mermaid_103.png
new file mode 100644
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--- /dev/null
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diff --git a/test/mermaid/hard/mermaid_104.png b/test/mermaid/hard/mermaid_104.png
new file mode 100644
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--- /dev/null
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diff --git a/test/mermaid/hard/mermaid_105.png b/test/mermaid/hard/mermaid_105.png
new file mode 100644
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diff --git a/test/mermaid/hard/mermaid_106.png b/test/mermaid/hard/mermaid_106.png
new file mode 100644
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--- /dev/null
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+version https://git-lfs.github.com/spec/v1
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diff --git a/test/mermaid/hard/mermaid_107.png b/test/mermaid/hard/mermaid_107.png
new file mode 100644
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--- /dev/null
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diff --git a/test/mermaid/hard/mermaid_108.png b/test/mermaid/hard/mermaid_108.png
new file mode 100644
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diff --git a/test/mermaid/hard/mermaid_109.png b/test/mermaid/hard/mermaid_109.png
new file mode 100644
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+version https://git-lfs.github.com/spec/v1
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diff --git a/test/mermaid/hard/mermaid_110.png b/test/mermaid/hard/mermaid_110.png
new file mode 100644
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